阅读说明：本技术 作业机 (Working machine ) 是由 中村太郎 泷口纯一郎 南方佑辅 小林孝德 于 2018-06-28 设计创作，主要内容包括：多个凸部(39)以隔着间隔(W1)而沿着车轮(5、6)的旋转方向(A1)排列的方式连结于车轮(5、6)的接地部(37)。凸部(39)具有相对于车轮(5、6)的旋转方向(A1)为斜向姿态的第一部分(41)和相对于车轮(5、6)的旋转方向(A1)为与第一部分(41)为相反朝向的斜向姿态的第二部分(42)。以第一部分(41)和第二部分(42)中在车轮(5、6)的旋转方向(A1)上的端部彼此相连的方式,设置第一部分(41)和第二部分(42)。(The plurality of convex portions (39) are connected to the land portions (37) of the wheels (5, 6) so as to be aligned along the rotational direction (A1) of the wheels (5, 6) with an interval (W1) therebetween. The convex portion (39) has a first portion (41) that assumes an oblique attitude with respect to the rotational direction (A1) of the wheels (5, 6), and a second portion (42) that assumes an oblique attitude with respect to the rotational direction (A1) of the wheels (5, 6) in an opposite orientation to the first portion (41). The first portion (41) and the second portion (42) are provided in such a manner that the ends of the first portion (41) and the second portion (42) in the rotational direction (A1) of the wheels (5, 6) are connected to each other.)

1. A kind of working machine is provided, which comprises a frame,

right and left wheels on one side in the front-rear direction of a body, right and left wheels on the other side in the front-rear direction of the body, a working device, and a prime mover for transmitting power to the wheels and the working device,

a plurality of convex portions are connected to a land portion of the wheel so as to be arranged at intervals along a rotational direction of the wheel,

the convex part is formed by the following steps,

having a first portion in an oblique posture with respect to the rotational direction of the wheel, a second portion in an oblique posture with respect to the rotational direction of the wheel in an opposite direction to the first portion,

the first portion and the second portion are provided in such a manner that ends in the rotational direction of the wheel in the first portion and the second portion are connected to each other.

2. The work machine of claim 1,

the middle part of the convex part is bent,

the portion of the convex portion on one side from the bent portion is the first portion, the portion of the convex portion on the other side from the bent portion is the second portion,

the bent portion of the projection is a portion where the first portion and the second portion are connected to each other.

3. The work machine according to claim 1 or 2,

the motive power unit is disposed so as to be shifted to one of right and left sides from the left and right center of the machine body,

in the convex portion of the wheel on the side of the prime mover,

a portion of the first portion and the second portion which is distant from each other is disposed on the body side with respect to a portion of the first portion and the second portion which are connected to each other,

in the convex part of the wheel opposite to the motive power part,

the first portion and the second portion are disposed on the opposite side of the body from the portion of the first portion and the second portion that is away from each other with respect to the portion of the first portion and the second portion that is connected to each other.

4. The working machine according to any one of claims 1 to 3,

the motive power unit is disposed so as to be shifted to one of right and left sides from the left and right center of the machine body,

the lateral width of the wheel on the side opposite to the motive power part is set to be larger than the lateral width of the wheel on the motive power part side,

the number of rows of the plurality of convex portions along the rotational direction of the wheel is set to be greater than the number of rows of the wheels on the prime mover side.

5. The work machine according to any one of claims 1 to 4,

among a plurality of the convex portions, in a row along a rotation direction of the wheel, among the wheels having a plurality of the rows,

the positions of the intervals are set to the same phase of the wheels so as to be aligned in the left-right direction of the machine body.

6. A kind of working machine is provided, which comprises a frame,

right and left wheels on one side in the front-rear direction of a body, right and left wheels on the other side in the front-rear direction of the body, a working device, and a prime mover for transmitting power to the wheels and the working device,

a balance weight is provided on one of the right and left wheels.

7. The working machine according to claim 6, wherein the prime mover is disposed so as to be displaced to the right or left of the counterweight side from the center of the machine body.

8. The work machine according to claim 6 or 7, wherein the balance weight is provided on an axle side of the wheel with respect to a land portion of the wheel.

9. The work machine of claim 8,

the wheel provided with the balance weight is characterized in that,

the vehicle body has the axle, a first lateral portion and a second lateral portion connected to the axle, and the land portion provided at an outer end portion of the first lateral portion and the second lateral portion,

the balance weight is provided on the axle side with respect to the land portion and between the first lateral side portion and the second lateral side portion.

10. The work machine of claim 9,

the balance weight is connected to the axle,

the outer end of the balance weight is in contact with or close to the surface of the ground contact portion on the axle side.

11. The work machine according to any one of claims 6 to 10, wherein the balance weight has a disc shape and is provided concentrically with the wheel.

12. A kind of lawn mower, which is provided with a mower,

comprising:

a cutting blade housing having an upper side, a right and a left lateral side;

right and left wheels provided on one side in the front-rear direction of the cutting blade housing, and right and left wheels provided on the other side in the front-rear direction of the cutting blade housing;

a cutting blade which is contained in the cutting blade housing and is driven to rotate,

an opening is provided in the lateral portion, and a lid portion capable of freely switching the opening between a closed state and an open state is provided.

13. The mower according to claim 12, wherein a cover portion for preventing flying objects from the cutting blade housing is supported outside the opening portion and extends downward so as to be swingable around an axis in a front-rear direction above the opening portion, and is disposed outside the opening portion.

14. The mower according to claim 12 or 13, wherein the motive power unit for transmitting the motive power to the wheels and the cutting blade is disposed so as to be shifted to one of right and left sides from a left-right center of the cutting blade housing,

the opening is provided on the lateral side opposite to the motive power portion.

Technical Field

The present invention relates to a working machine such as a lawnmower.

Background

As a working machine such as a mower on which an operator does not ride, there are self-propelled and remote-operated mowers as disclosed in patent document 1, and there are walk-behind mowers in which a long handle is extended from a blade housing that houses a cutting blade of a machine body as disclosed in patent document 2. Such a mower is mainly used for mowing an inclined surface such as a bank of an expressway or a river or an inclined surface of a nursery.

The lawnmowers of patent documents 1 and 2 include right and left wheels on one side in the front-rear direction of the body, right and left wheels on the other side in the front-rear direction of the body, and a working device, and include a prime mover (an engine, an electric motor, a battery, and the like) that transmits power to the wheels and the working device.

In the lawnmowers as in patent documents 1 and 2, since the lawnmower travels on the lawn, a plurality of projections are provided on the land portions of the wheels. The convex portion is set in an attitude perpendicular to the rotational direction of the wheel (an attitude parallel to the axle of the wheel), and the driving force of the wheel is sufficiently transmitted to the ground.

Disclosure of Invention

Problems to be solved by the invention

When mowing a slope, the following operations may be repeated: the mowing operation is performed while traveling along the contour of the slope from one end of the slope to the other end, and if the machine body reaches the other end of the slope, the machine body is moved slightly downward or upward along the slope, and the mowing operation is performed while traveling along the contour of the slope from the other end of the slope to the one end.

When the mower travels along the contour line of the slope as described above, the mower may slide down the valley side (lower side) of the slope because the mower travels in an inclined state in which the top side (upper side) of the slope is at a high position and the valley side (lower side) of the slope is at a low position. Further, the machine body may fall down to the valley side (lower side) of the slope.

In addition, in the lawn mower, maintenance work such as replacement of the cutting blade, grinding, replacement of other parts, and cleaning of the inside of the cutting blade housing is performed. In the case of performing maintenance work, for example, it is necessary to lift the entire mower and open the lower side of the cutter housing to a large extent to perform maintenance work.

There are various maintenance operations such as a large-scale maintenance operation that takes time, a simple maintenance operation that can be easily performed, and the like. In this state, in the lawnmowers of patent documents 1 and 2, all maintenance work needs to be performed by lifting the whole lawnmower as described above, and therefore there is room for improvement in workability.

Means for solving the problems

In the work machine according to one embodiment of the present invention,

right and left wheels on one side in the front-rear direction of a body, right and left wheels on the other side in the front-rear direction of the body, a working device, and a prime mover for transmitting power to the wheels and the working device;

a plurality of convex portions connected to a land portion of the wheel so as to be arranged in a rotational direction of the wheel with a gap therebetween;

the convex part is formed by the following steps,

having a first portion in an oblique posture with respect to the rotational direction of the wheel, a second portion in an oblique posture with respect to the rotational direction of the wheel in an opposite direction to the first portion,

the first portion and the second portion are provided in such a manner that ends in the rotational direction of the wheel in the first portion and the second portion are connected to each other.

According to such a structure, if the wheel is rotationally driven, in the wheel, the first portion and the second portion of the convex portion are in an oblique posture with respect to the rotational direction of the wheel, whereby the driving force of the wheel is sufficiently obtained on the ground via the convex portion (the first portion and the second portion), and the machine body moves forward (backward).

If the first and second portions of the convex portion are in an oblique posture with respect to the rotational direction of the wheel, there is a possibility that the driving force of the wheel is applied obliquely toward the front side (obliquely toward the rear side) of the machine body.

According to the above configuration, since the first portion and the second portion of the convex portion are oriented in opposite directions to each other, the direction in which the driving force of the wheel is obliquely applied from the first portion of the convex portion and the direction in which the driving force of the wheel is obliquely applied from the second portion of the convex portion are oriented in opposite directions to each other, and the driving force of the wheel is cancelled out, the driving force of the wheel can be transmitted to the front side (rear side) of the machine body through the first portion and the second portion of the convex portion without any trouble.

In the case where the working machine travels along the contour line of the slope, according to the above configuration, the first portion and the second portion of the convex portion and the valley side (lower side) of the slope face are directed toward the wheel, and therefore even if the machine body is to be slid toward the valley side (lower side) of the slope face, the machine body can be prevented from being slid toward the valley side (lower side) of the slope face by the first portion and the second portion of the convex portion.

As described above, in the working machine, the wheels capable of sufficiently transmitting the driving force to the ground and preventing the machine body from slipping down to the valley side (lower side) of the slope can be obtained, and the traveling performance of the working machine can be improved.

In the present invention, it is preferable that,

the middle part of the convex part is bent,

the portion of the convex portion on one side from the bent portion is the first portion, the portion of the convex portion on the other side from the bent portion is the second portion,

the bent portion of the projection is a portion where the first portion and the second portion are connected to each other.

According to such a configuration, the first portion and the second portion of the convex portion can be obtained by bending the middle portion of the convex portion, which is advantageous in terms of simplification of the configuration. Since the first portion and the second portion of the convex portion can be handled as one member, it is also advantageous in terms of reduction in the number of components.

In the present invention, it is preferable that,

the motive power unit is disposed so as to be shifted to one of right and left sides from the left and right center of the machine body,

in the convex portion of the wheel on the side of the prime mover,

a portion of the first portion and the second portion which is distant from each other is disposed on the body side with respect to a portion of the first portion and the second portion which are connected to each other,

in the convex part of the wheel opposite to the motive power part,

the first portion and the second portion are disposed on the opposite side of the body from the portion of the first portion and the second portion that is away from each other with respect to the portion of the first portion and the second portion that is connected to each other.

According to this configuration, the center of gravity of the body is located closer to the driving unit side than the left-right center of the body by disposing the driving unit so as to be shifted to one of the right and left sides from the left-right center of the body.

Accordingly, when traveling along the contour line of the slope, the vehicle travels in a state where the wheel on the prime mover side is the mountain side (upper side) of the slope and the wheel on the opposite side to the prime mover side is the valley side (lower side) of the slope, and thus the center of gravity of the machine body can be positioned on the mountain side (upper side) of the slope with respect to the left and right center of the machine body, and the machine body can be prevented from falling down to the valley side (lower side) of the slope.

In the foregoing state, if the body is to slide down to the valley side (lower side) of the slope, the body is to slide down to the opposite side to the original portion.

According to the above configuration, in the convex portion of the wheel on the prime mover side, a portion of the first portion and the second portion that is apart from each other is disposed on the body side with respect to a portion of the first portion and the second portion that are connected to each other, and the first portion and the second portion of the convex portion are in a state of being open to the valley side (lower side) of the slope.

Similarly, in the convex portion of the wheel on the side opposite to the motive power portion, a portion of the first portion and the second portion which is apart from each other is disposed on the side opposite to the body with respect to a portion of the first portion and the second portion which are connected to each other, and the first portion and the second portion of the convex portion are in an open state to the valley side (lower side) of the slope.

Accordingly, if the machine body is to slide down to the valley side (lower side) of the slope, the soil or the like on the slope enters the first portion and the second portion of the convex portion in the wheel on the primary portion side and the wheel on the opposite side to the primary portion, and the machine body can be prevented from sliding down to the valley side (lower side) of the slope.

In the present invention, it is preferable that,

the motive power unit is disposed so as to be shifted to one of right and left sides from the left and right center of the machine body,

the lateral width of the wheel on the side opposite to the motive power part is set to be larger than the lateral width of the wheel on the motive power part side,

the number of rows of the plurality of convex portions along the rotational direction of the wheel is set to be greater than the number of rows of the wheels on the prime mover side.

According to this configuration, the center of gravity of the body is located closer to the driving unit side than the left-right center of the body by disposing the driving unit so as to be shifted to the right or left from the left-right center of the body.

Accordingly, when traveling along the contour line of the slope, the vehicle travels in a state where the wheel on the prime mover side is the mountain side (upper side) of the slope and the wheel on the opposite side to the prime mover side is the valley side (lower side) of the slope, and thus the center of gravity of the machine body can be positioned on the mountain side (upper side) of the slope with respect to the left and right center of the machine body, and the machine body can be prevented from falling down to the valley side (lower side) of the slope.

As described above, when the machine body is tilted toward the valley side (lower side) of the slope in a state where the work machine is traveling along the contour line of the slope, the machine body is tilted toward the valley side (lower side) of the slope with the outer end portion of the wheel on the valley side (lower side) of the slope as a fulcrum. Due to the inclination of the inclined surface, the ground contact pressure of the wheel on the valley side (lower side) of the inclined surface is easily higher than that of the wheel on the mountain side (upper side) of the inclined surface.

According to the above configuration, if the vehicle travels in a state where the wheel on the prime mover side is on the hill side (upper side) of the slope, the lateral width of the wheel on the side opposite to the prime mover (valley side (lower side) of the slope) is large, so that the outer end portion of the wheel on the side opposite to the prime mover can be separated from the machine body to the outside in the left-right direction of the machine body, and the machine body can be prevented from falling down on the valley side (lower side) of the slope.

According to the above configuration, the lateral width of the wheel on the side opposite to the motive power portion (the valley side (lower side) of the inclined surface) is large, and thus the number of rows of the convex portions can be set much larger in the wheel on the side opposite to the motive power portion (the valley side (lower side) of the inclined surface) without hindrance.

As described above, according to the above configuration, the body can be prevented from falling down to the valley side (lower side) of the slope, and the ground contact pressure of the wheel on the side opposite to the prime mover is high, so that the body can be prevented from falling down to the valley side (lower side) of the slope by utilizing the point that the convex portion of the wheel on the side opposite to the prime mover is strongly pressed against the slope and the point that the number of rows of the convex portions of the wheel on the side opposite to the prime mover is large.

In the present invention, it is preferable that,

in a row of the plurality of the convex portions along the rotational direction of the wheel, in the wheel having the plurality of the rows,

the positions of the gaps are set to be aligned in the left-right direction of the machine body at the same phase of the wheels.

In the case where the plurality of convex portions are arranged in the left-right direction of the machine body in the same phase of the wheel in the state where the plurality of convex portions are connected to the land portion of the wheel so as to be aligned along the rotation direction of the wheel with a gap therebetween, according to the above configuration, the position of the gap does not become a narrow region in the vicinity of the gap, and a state where stones, foreign materials, and the like are not likely to enter the vicinity of the gap and are not likely to come off is not likely to occur.

In the work machine according to one embodiment of the present invention,

right and left wheels on one side in the front-rear direction of a body, right and left wheels on the other side in the front-rear direction of the body, a working device, and a prime mover for transmitting power to the wheels and the working device;

a balance weight is provided on one of the right and left wheels.

In such a working machine in which the right and left wheels and the prime mover are arranged, when traveling along the contour line of the slope, the working machine may travel with the wheel on the counterweight side being the peak side (upper side) of the slope and the wheel on the opposite side of the counterweight being the valley side (lower side) of the slope.

When the balance weight is provided on one of the right and left wheels in this manner, the center of gravity of the machine body is located closer to the balance weight side than the center of the machine body.

Accordingly, when the vehicle travels along the contour line of the slope, the vehicle travels with the wheel on the counterweight side on the mountain side (upper side) of the slope, and the center of gravity of the machine body is positioned on the mountain side (upper side) of the slope with respect to the left and right centers of the machine body, and the machine body can be prevented from falling down to the valley side (lower side) of the slope.

According to the above configuration, by providing the balance weight on the wheel which is a conventional member, the wheel can be used also as a support member for the balance weight, and the structure can be simplified.

Since the wheels are not disposed at the center of the body in the right and left directions, the center of gravity of the body can be positioned closer to the balance weight side than the center of the body in the right and left directions without hindrance by providing the balance weights on the wheels.

In the present invention, it is preferable that,

the driving unit is disposed so as to be shifted to the right or left of the counterweight side from the center of the right or left of the machine body.

With such a configuration, the prime mover (such as an engine, an electric motor, and a battery) also contributes to the function of the counterweight, and the center of gravity of the machine body can be positioned closer to the counterweight side than the center of the left and right sides of the machine body without hindrance.

In the present invention, it is preferable that,

the balance weight is provided on the axle side of the wheel with respect to the land portion of the wheel.

With this configuration, when the wheels (ground contact portions) of the working machine travel in a ground contact manner, the balance weight rarely interferes with the travel.

In the present invention, it is preferable that,

the wheel provided with the balance weight is characterized in that,

the vehicle body has the axle, a first lateral portion and a second lateral portion connected to the axle, and the land portion provided at an outer end portion of the first lateral portion and the second lateral portion,

the balance weight is provided on the axle side with respect to the land portion and between the first lateral side portion and the second lateral side portion.

In the wheel having the axle, the first lateral portion and the second lateral portion coupled to the axle, and the land portion provided at the outer end portion of the first lateral portion and the second lateral portion, the balance weight is provided in the wheel according to the above configuration, and therefore, the grass and foreign matter on the land surface are less likely to be entangled with the balance weight and interfere with the traveling.

In the present invention, it is preferable that,

the balance weight is connected to the axle,

the outer end of the balance weight is in contact with or close to the surface of the ground contact portion on the axle side.

According to such a configuration, when the weight of the working machine is applied to the land portions of the wheels in the ground contact travel of the wheels (land portions) in the working machine, the weight of the working machine can be supported by the axle via the balance weight in addition to the state in which the weight of the working machine is supported by the axle via the first lateral portion and the second lateral portion.

Thus, the balance weight also becomes a part of the wheel, and the wheel that supports the weight of the working machine without hindrance can be obtained.

In the present invention, it is preferable that,

the balance weight is in a disc shape and is arranged concentrically with the wheel.

According to this configuration, when the wheel and the balance weight are configured to rotate integrally, the rotation unevenness is less likely to occur in the wheel and the balance weight, and the traveling stability of the working machine is less likely to be impaired.

In the work machine according to one embodiment of the present invention,

comprising:

a cutting blade housing having an upper side, a right and a left lateral side;

right and left wheels provided on one side in the front-rear direction of the cutting blade housing, right and left wheels provided on the other side in the front-rear direction of the cutting blade housing, and

a cutting blade which is accommodated in the cutting blade housing and is driven to rotate;

an opening is provided in the lateral side portion, and a lid portion capable of freely switching the opening between a closed state and an open state is provided.

With this configuration, the opening of the lateral side portion of the blade housing is opened, whereby maintenance work of the blade and the inside of the blade housing can be performed.

In this case, in the simple maintenance work which can be easily performed, the maintenance work may be performed with the opening portion of the lateral side portion of the cutter blade housing opened as described above, and it is not necessary to lift the entire working machine such as the lawnmower to perform the maintenance work.

In the case of a large-scale maintenance operation that takes time, the entire work implement may be lifted up to perform the maintenance operation.

According to the above configuration, in the simple maintenance work which can be easily performed, the maintenance work can be performed without lifting the entire work implement, and therefore, the maintenance work can be performed without lifting the entire work implement in all the maintenance works, and the workability of the maintenance work in the work implement can be improved.

In the present invention, it is preferable that,

a cover portion for preventing the scattered matter from the cutting blade housing is supported outside the opening portion and swingably around an axis in the front-rear direction above the opening portion, extends downward, and is disposed outside the opening portion.

When the cutting blade is rotationally driven inside the cutting blade housing, a small stone or the like on the ground may be flicked up by the cutting blade and scattered to the outside of the cutting blade housing.

According to the above configuration, since the cover portion is provided outside the lateral side portion of the blade housing, even if the small stone or the like on the ground is flicked up by the cutting blade and is scattered to the outside from the lateral side portion of the blade housing, the scattered matter such as the small stone is blocked by the cover portion.

According to the above configuration, since the cover portion is supported so as to be swingable around the longitudinal axis outside the opening portion, the cover portion can be lifted up by swinging the cover portion upward when the opening portion of the lateral side portion of the blade housing is opened for maintenance work as described above, and the vicinity of the lateral side portion of the blade housing can be opened.

Thus, the opening of the lateral side portion of the blade housing can be opened without any trouble, and maintenance work can be performed.

In the present invention, it is preferable that,

a driving unit for transmitting power to the wheel and the cutting blade is disposed so as to be shifted to one of right and left sides from a left-right center of the cutting blade housing,

the opening is provided on the lateral side opposite to the motive power portion.

In some work machines, mowing work is performed on slopes such as highways, banks of rivers, and slopes of nurseries, and in mowing work on slopes, mowing work is often performed while traveling along the contour lines of slopes.

In this state, the working machine travels in an inclined state in which the mountain side (upper side) of the inclined surface is at a high position and the valley side (lower side) of the inclined surface is at a low position, and therefore the machine body may fall down to the valley side (lower side) of the inclined surface.

According to the above configuration, since the prime mover (such as an engine, an electric motor, and a battery) for transmitting power to the wheels and the blade is disposed so as to be displaced to one of the right and left sides from the left and right center of the blade housing, the center of gravity of the working machine is located on the prime mover side from the left and right center of the blade housing.

Accordingly, when traveling along the contour line of the slope, the working machine travels in a state where the wheel on the prime mover side is the mountain side (upper side) of the slope and the wheel on the opposite side to the prime mover side is the valley side (lower side) of the slope, and thus travels in a state where the center of gravity of the working machine is positioned on the mountain side (upper side) of the slope with respect to the left and right center of the cutter blade housing, and the working machine can be prevented from falling down to the valley side (lower side) of the slope.

According to the above configuration, the opening portion is provided on the lateral side portion on the opposite side to the driving portion, among the right and left lateral side portions of the cutting blade housing.

Thus, when the opening of the lateral side portion of the blade housing is opened to perform maintenance work, the prime mover does not interfere with the maintenance work, and the maintenance work can be performed without any problem.

Drawings

Fig. 1 is an overall right side view of the lawn mower.

Fig. 2 is an overall plan view of the lawnmower.

FIG. 3 is a drive train diagram showing the drive train from the engine to the wheels and cutting edge.

Fig. 4 is a schematic diagram showing a state of association between the control device and each unit.

Fig. 5 is a cross-sectional view of the right wheel.

Fig. 6 is a cross-sectional view of the left wheel.

Fig. 7 is an expanded view showing the arrangement state of the convex portions in the right and left wheels.

Fig. 8 is an expanded view showing the arrangement state of the convex portion in the left wheel in the first other embodiment of the invention.

Fig. 9 is an expanded view showing the arrangement state of the convex portion in the left wheel in the second other embodiment of the invention.

Fig. 10 is an expanded view showing the arrangement state of the convex portion in the left wheel in the second other embodiment of the invention.

Fig. 11 is an expanded view showing an arrangement state of a convex portion in a right wheel in a third other embodiment of the invention.

Fig. 12 is a cross-sectional view of a right wheel in a sixth alternate embodiment of the invention.

Fig. 13 is a cross-sectional view of a right wheel in a seventh alternate embodiment of the invention.

Fig. 14 is a top view of the cutting blade housing.

Fig. 15 is a left side view of the cutting blade housing.

Fig. 16 is a left side view of the cutter blade housing in a state where the cover portion is lifted and the cover portion is removed.

Fig. 17 is an exploded perspective view of the cutting blade housing.

Detailed Description

Fig. 1 to 17 show a remotely operated lawnmower that is operated by wireless as an example of a working machine. In fig. 1 to 17, "F" indicates the front direction of the lawnmower, and "B" indicates the rear direction of the lawnmower. "U" indicates the upper direction of the lawnmower, and "D" indicates the lower direction of the lawnmower. "R" represents a right direction of the lawnmower, and "L" represents a left direction of the lawnmower.

(Whole construction of mower)

As shown in fig. 1 and 2, the lawnmower includes a blade housing 1 (corresponding to a machine body), a blade 2 (corresponding to a working device) housed in the blade housing 1, and a transmission case 3 and an engine 4 (corresponding to a prime mover) supported by the blade housing 1.

The cutting blade housing 1 is supported by wheels 5 and 6, which include a right wheel 5 and a left wheel 6 on one side in the front-rear direction of the cutting blade housing 1 and a right wheel 5 and a left wheel 6 on the other side in the front-rear direction of the cutting blade housing 1. Has a cover 7 covering the upper side of the transmission case 3 and the engine 4 and the like.

(Structure of cutting blade case)

As illustrated in fig. 14 to 17, the cutting blade housing 1 includes, for example, a central portion 54 and right and left lateral portions 55, and the right and left lateral portions 55 are connected to the central portion 54.

The central portion 54 has an upper side portion 54a and right and left lateral side portions 54b, and a cutout-shaped opening 54c having a rectangular shape in a plan view and having no lower portion is formed in the lateral side portions 54 b. As shown in fig. 1 and 2, the right wheel 5 and the left wheel 6 are supported on the front portion of the center portion 54 (the cutting blade housing 1), and the right wheel 5 and the left wheel 6 are supported on the rear portion of the center portion 54.

As shown in fig. 14 to 17, the right and left lateral portions 55 have an upper portion 55a and only one lateral portion 55b, and are trapezoidal in plan view, and are connected to the portion of the opening 54c in the lateral portion 54b of the central portion 54.

A lateral side portion 55b of the left lateral portion 55 is provided with a notch-shaped opening portion 55c having no lower portion. A bolt 56 is provided on the outer peripheral portion of the opening portion 55c of the left lateral portion 55, a flat plate-shaped lid portion 70 is coupled to the bolt 56 by a nut, and the opening portion 55c of the left lateral portion 55 is closed by the lid portion 70.

(structures relating to cutting blades and engines)

As shown in fig. 1 and 2, the front and rear frames 8 are coupled to the blade housing 1 in the left-right direction, and the frame 9 is coupled to the front and rear frames 8 in the front-rear direction.

The transmission case 3 is connected to the frame 9 and supported by the cutting blade housing 1, and the cutting blade support portion 3a extending downward from the transmission case 3 is inserted into the cutting blade housing 1. The cutting blade 2 is rotatably supported by a cutting blade support portion 3a of the transmission housing 3, and the cutting blade 2 is accommodated in the cutting blade housing 1.

As a specific example, as shown in fig. 1 and 2, and fig. 14 to 17, in the cutting blade housing 1, the frame 8 is coupled to the upper side portions 54a and 55a of the central portion 54 and the lateral portion 55 in the left-right direction, and the frame 9 is coupled to the front and rear side frames 8 across the front and rear side frames in the front-rear direction.

The transmission case 3 is coupled to the frame 9 and supported by the cutting blade housing 1, and the cutting blade support portion 3a extending downward from the transmission case 3 is inserted into the cutting blade housing 1 from the opening portion 54d of the upper side portion 54a of the central portion 54. The cutting blade 2 is rotatably supported around a vertical axis P3 on a cutting blade support portion 3a of the transmission case 3, and the cutting blade 2 is accommodated in the cutting blade housing 1.

As shown in fig. 1, 2, and 3, the cutting blade 2 includes a disk-shaped support plate 2a and a blade portion 2b supported rotatably around a vertical axis P2 at a plurality of positions on the outer peripheral portion of the support plate 2 a.

If the cutting blade 2 is rotationally driven inside the blade housing 1, the cutting blade 2 may bounce and scatter outside the blade housing 1, and therefore, as shown in fig. 1 and 2, right and left cover portions 50 for preventing scattered matter from the blade housing 1 are provided on the right and left portions of the blade housing 1.

As shown in fig. 1 and 2, the engine 4 is connected to the frame 8 so as to be positioned at the right portion of the blade housing 1, and is supported by the blade housing 1.

The engine 4 is displaced from the left-right center CL of the cutter blade housing 1 to the right in a plan view, and the engine 4 is disposed between the right wheels 5. The engine 4 is disposed at a low position so that an upper portion of the right wheel 5 overlaps a lower portion of the engine 4 in the front-rear direction view.

For example, as shown in fig. 1, 2, 16, and 17, the cutting blade housing 1 may be provided with an opening 55c at a lateral side portion 55b of the left lateral portion 55, and an opening 55c at a lateral side portion 55b of the lateral portion 55 opposite to the engine 4. In this case, the cover portion can be configured as follows.

(Structure of cover)

If the cutting blade 2 is rotationally driven inside the cutting blade housing 1, the cutting blade 2 may bounce off small stones on the ground and scatter outside the cutting blade housing 1. As a result, as shown in fig. 1 and 2, right and left cover portions 50 that prevent scattered objects from the cutting blade housing 1 are provided on the right and left portions of the cutting blade housing 1.

As shown in fig. 17, the cover 50 includes a frame portion 61 in which a tube is bent into a channel shape, two frame portions 62 connected to the tube of the frame portion 61, and a flat cover plate 63 connected across the frame portions 61 and 62.

As shown in fig. 14 and 17, the upper portion of the frame portion 62 is supported swingably around a front-rear direction axis P4 of the right portion of the frame 8 at the right cover portion 50, and the right cover portion 50 extends downward from the axis P4.

The shaft center P4 is located outside and above the lateral side portion 55b of the right lateral portion 55. As shown in fig. 1 and 2, right cover portion 50 is disposed outside lateral portion 55b of right lateral portion 55 between front wheel 5 and rear wheel 6.

As shown in fig. 14 to 17, the upper portion of the frame portion 62 is supported swingably around a front-rear direction axis P5 at the left end portion of the frame 8 at the left cover portion 50, and the left cover portion 50 extends downward from the axis P5.

The shaft center P5 is located outside and above the lateral side portion 55b (opening portion 55c) of the left lateral portion 55. As shown in fig. 1 and 2, left cover 50 is disposed outside lateral side 55b (opening 55c) of left lateral side 55 between front wheel 5 and rear wheel 6.

As shown in fig. 15 and 16, the left cover portion 50 is swung upward around the axial center P5 and lifted, whereby the vicinity of the lateral side portion 55b (opening portion 55c) of the left lateral portion 55 can be opened. Thus, by detaching the lid 70, the opening 55c of the left lateral portion 55 can be opened.

(drive structure to cutting edge)

As shown in fig. 3, the power of the output shaft 4a of the engine 4 is transmitted to a propeller shaft 18 via a centrifugal clutch 16 and a brake 17 inside the transmission case 3 (see fig. 2, the same applies hereinafter), and is transmitted from the propeller shaft 18 to a generator 20 via a transmission belt 19.

Inside the transmission case 3, the power of the transmission shaft 18 is transmitted to the transmission shaft 21, and the power of the transmission shaft 21 is transmitted to the cutting blade driving shaft 23 supported inside the cutting blade support portion 3a of the transmission case 3 via the cutting blade clutch 22.

The cutting blade 2 (support plate 2a) is coupled to a lower portion of the cutting blade drive shaft 23, and the cutting blade 2 is rotationally driven. The blade clutch 22 can be operated to a transmission state and a cutoff state by a blade clutch operating lever (not shown) supported by the blade housing 1.

(supporting structure and transmission structure of wheel)

As shown in fig. 3, a worm mechanism 24 is provided on the drive shaft 21 inside the drive housing 3 (see fig. 2, the same applies hereinafter). The power of the transmission shaft 21 is transmitted from the worm mechanism 24 to the forward/reverse switching device 28 via the transmission shaft 25, the transmission 26, and the transmission shaft 27. Outside the transmission housing 3, the power of the forward/reverse switching device 28 is transmitted to the transmission shaft 31 via the torque limiter 29 and the transmission chain 30.

The transmission 26 is freely shiftable between a low speed state and a high speed state by sliding operation of the displacement member, and is operable to the low speed state and the high speed state by a shift lever (not shown) supported by the cutter housing 1 (see fig. 2, the same applies hereinafter). The forward/reverse switching device 28 is operable to be in a forward state, a reverse state, and a neutral state by a sliding operation of the shift member.

As shown in fig. 1, 2, and 3, the transmission shaft 32 is supported in the vertical direction at the right and left portions of the front portion of the cutting blade housing 1, the shaft center P1 of the transmission shaft 32 in the vertical direction is supported at the right and left portions of the rear portion of the cutting blade housing 1, and the power of the transmission shaft 31 is transmitted to the transmission shaft 32.

As shown in fig. 1 and 2, the right wheel support case 10 is supported at the right portions of the front and rear portions of the blade housing 1 (the central portion 54) so as to be freely rotatable around the drive shaft 32 (the shaft center P1) supported in the vertical direction. The left wheel support case 11 is supported at the front and rear left portions of the blade housing 1 (the center portion 54) so as to be freely operable around the vertically supported transmission shaft 32 (the shaft core P1).

As shown in fig. 1, 2, and 3, the axle 33 is supported by the right and left wheel support cases 10 and 11, the wheels 5 and 6 are coupled to the axle 33, and the power of the propeller shaft 32 is transmitted to the axle 33 to rotationally drive the wheels 5 and 6.

As shown in fig. 1 and 2, a tie rod 12 is connected across the arms 10a, 11a of the right and left wheel support housings 10, 11. A lever 15 is connected to the arm 10b of the right wheel support case 10 and a first direction operation motor 13 (see fig. 4) attached to the blade housing 1, and the right and left wheels 5 and 6 on one side in the front-rear direction of the blade housing 1 are operated in the forward-rearward direction by the first direction operation motor 13.

A lever 15 is connected to the arm 11b of the left wheel support case 11 and a second direction operation motor 14 (see fig. 4) attached to the cutter blade housing 1, and the right and left wheels 5 and 6 on the other side in the front-rear direction of the cutter blade housing 1 are operated in the forward direction by the second direction operation motor 14.

Hereinafter, a description will be given of a structural example of the wheel.

(Structure of right wheel)

As shown in fig. 5, the right wheel 5 includes a cylindrical axle 34, a first lateral portion 35 formed by pressing a plate material into a disc shape, and a second lateral portion 36 formed by pressing a plate material into a disc shape, and the first lateral portion 35 and the second lateral portion 36 are coupled to the axle 34.

As shown in fig. 1, 2, and 5, the outer peripheral portion of the first lateral portion 35 extends to form a land portion 37, and an end portion of the land portion 37 is connected to the outer peripheral portion of the second lateral portion 36 to form a flat plate-like rib 38 protruding outward in the radial direction. The axle 33 is inserted into the axle 34, and the axles 33 and 34 are coupled by bolts.

As shown in fig. 1, 2, 5, and 7, the plurality of convex portions 39 are connected to the land portion 37 so as to be arranged along the rotation direction a1 of the right wheel 5 with an interval W1 therebetween.

As shown in fig. 7, the convex portion 39 is formed by bending the intermediate portion 40, and has a first portion 41 which is a portion on one side from the intermediate portion 40 (bent portion) of the convex portion 39, and a second portion 42 which is a portion on the other side from the intermediate portion 40 (bent portion) of the convex portion 39.

As shown in fig. 7, the first portion 41 of the convex portion 39 is in an oblique posture with respect to the rotation direction a1 of the right wheel 5. The second portion 42 of the convex portion 39 is in an oblique posture with respect to the rotation direction a1 of the right wheel 5 in an opposite direction to the first portion 41 of the convex portion 39. The outer peripheral portions of the first portion 41 and the second portion 42 of the convex portion 39 are formed in a concave-convex shape.

With the above configuration, the first portion 41 and the second portion 42 of the convex portion 39 are provided so that the end portions (the intermediate portion 40 of the convex portion 39) in the rotation direction a1 of the right wheel 5 of the first portion 41 and the second portion 42 of the convex portion 39 are continuous with each other. The bent portion (intermediate portion 40) of the convex portion 39 is a portion where the first portion 41 and the second portion 42 of the convex portion 39 are connected to each other.

As shown in fig. 2 and 7, in the right wheel 5, the rib 38 is disposed at the end portion of the land portion 37 on the cutting blade housing 1 side (body side).

In the convex portion 39 of the right wheel 5, with respect to the intermediate portion 40 (the portion where the first portion 41 and the second portion 42 are connected to each other) of the convex portion 39, the portions 41a, 42a of the first portion 41 and the second portion 42 of the convex portion 39 that are away from each other are arranged on the cutting blade housing 1 side (the body side) (the rib 38 side).

(Structure of left wheel)

As shown in fig. 6, the left wheel 6 includes a cylindrical axle 34, right and left first lateral portions 35 formed by press-working a plate material into a disk shape, and a second lateral portion 36 formed by press-working a plate material into a disk shape, and the right and left first lateral portions 35 and the second lateral portion 36 are coupled to the axle 34.

As shown in fig. 2 and 6, the outer peripheral portion of the left first lateral portion 35 extends to form a left land portion 37, and an end portion of the left land portion 37 is connected to the outer peripheral portion of the second lateral portion 36 to form a flat plate-like rib 38 protruding radially outward. The outer peripheral portion of the right first lateral portion 35 extends to form a right land portion 37, and an end portion of the right land portion 37 is connected to an end portion of the left land portion 37. The axle 33 is inserted into the axle 34, and the axles 33 and 34 are coupled by bolts.

As shown in fig. 2, 6, and 7, the plurality of convex portions 39 are connected to the right and left land portions 37 so as to be aligned along the rotation direction a1 of the left wheel 6 with an interval W1 therebetween, as in the case of the right wheel 5.

The convex portion 39 is formed by bending the intermediate portion 40, and has a first portion 41 which is a portion on one side from the intermediate portion 40 (bent portion) of the convex portion 39, and a second portion 42 which is a portion on the other side from the intermediate portion 40 (bent portion) of the convex portion 39.

As shown in fig. 7, the first portion 41 of the convex portion 39 is inclined with respect to the rotation direction a1 of the left wheel 6. The second portion 42 of the convex portion 39 is in an oblique posture in an opposite direction to the first portion 41 of the convex portion 39 with respect to the rotation direction a1 of the left wheel 6. The outer peripheral portions of the first portion 41 and the second portion 42 of the convex portion 39 are formed in a concave-convex shape.

With the above configuration, the first portion 41 and the second portion 42 of the convex portion 39 are provided so that the end portions (the intermediate portion 40 of the convex portion 39) in the rotation direction a1 of the left wheel 6 among the first portion 41 and the second portion 42 of the convex portion 39 are continuous with each other. The bent portion (intermediate portion 40) of the convex portion 39 is a portion where the first portion 41 and the second portion 42 of the convex portion 39 are connected to each other.

As shown in fig. 2 and 7, in the left wheel 6, the rib 38 is disposed at an end portion of the left land portion 37 opposite to the cutting blade housing 1 side (body side).

In the convex portion 39 of the left wheel 6, with respect to the intermediate portion 40 (the portion where the first portion 41 and the second portion 42 are connected to each other) of the convex portion 39, the portions 41a, 42a of the first portion 41 and the second portion 42 of the convex portion 39 that are away from each other are arranged on the side opposite to the cutting blade housing 1 (the side opposite to the machine body) (the rib 38 side).

(comparison of the Right wheel with the left wheel)

As shown in fig. 5, 6, and 7, the lateral width W3 of the left wheel 6 on the opposite side of the engine 4 is about 2 times larger than the lateral width W2 of the right wheel 5 on the engine 4 side.

The row formed along the rotation direction a1 of the wheels 5, 6 among the plurality of convex portions 39 is 1 row in the right wheel 5 that is the engine 4 side. On the other hand, the left wheel 6 on the opposite side of the engine 4 has 2 rows, which are more than 1 row.

In the left wheel 6, as described above, the row of the plurality of convex portions 39 along the rotation direction a1 of the wheels 5, 6 is 2 rows. In this case, the positions of the spaces W1 are set to the same phase of the left wheel 6 so as to be aligned in the left-right direction of the cutting blade housing 1.

In the right and left wheels 5, 6, the position of the space W1 is also set to the same phase in the right and left wheels 5, 6 so as to be aligned in the right-left direction of the cutting blade housing 1.

As shown in fig. 5 and 6, a balance weight 43 is provided on the right wheel 5. In contrast, the balance weight 43 is not provided on the left wheel 6.

As shown in fig. 5, a disc-shaped balance weight 43 is provided, the balance weight 43 is disposed inside the right wheel 5 and coupled to the axle 34, and the balance weight 43 is provided concentrically with the right wheel 5.

As shown in fig. 2 and 5, the balance weight 43 is provided on the right wheel 5, and the engine 4 is displaced to the right from the left and right center CL of the cutting blade housing 1, whereby the engine 4 is displaced to the balance weight 43 side from the left and right center CL of the cutting blade housing 1.

As shown in fig. 5, in the right wheel 5, the balance weight 43 is provided between the first lateral side portion 35 and the second lateral side portion 36. The outer end portion 43a of the balance weight 43 is in a state of being close to (or in contact with) the inner surface of the land portion 37 (the surface on the axle 33, 34 side), and the outer end portion 43a of the balance weight 43 is disposed on the axle 33, 34 side with respect to the land portion 37.

(Wireless operation of mower)

The lawn mower is a remote operation type using wireless manipulation.

As shown in fig. 4, the cutter blade housing 1 includes a control device 44, a receiver 45, an operation stop switch 46 operated by an operator, an accelerator motor 47 for operating an accelerator 4b and a brake 17 of the engine 4, and a forward/backward motor 48 for operating the forward/backward switching device 28.

The accelerator 4b of the engine 4 is biased to a low speed side (idling side) by a spring (not shown), and the brake 17 is biased to a braking side by a spring (not shown).

In the idling state of the engine 4, the centrifugal clutch 16 (see fig. 3, and the same applies hereinafter) is in the disengaged state, and the brake 17 is in the braking state. The brake 17 is operated to the released state by the accelerator motor 47, the accelerator 4b of the engine 4 is operated to the high speed side, and the centrifugal clutch 16 is brought into the transmission state.

The control device 44 operates the first-direction operation motor 13, the second-direction operation motor 14, the accelerator motor 47, and the forward/backward movement motor 48, and inputs operation signals of the receiver 45 and the operation stop switch 46 to the control device 44.

The receiver 45 receives an operation signal of the transmitter 49 operated by the operator, and the control device 44 operates the first-direction operation motor 13, the second-direction operation motor 14, the accelerator motor 47, and the forward/backward movement motor 48 based on the operation signal of the transmitter 49 (receiver 45).

When the right and left wheels 5, 6 on one side in the front-rear direction of the cutting blade housing 1 are operated in the direction by the first direction operation motor 13 and when the right and left wheels 5, 6 on the other side in the front-rear direction of the cutting blade housing 1 are operated in the direction by the second direction operation motor 14, the first direction operation mode, the second direction operation mode, the same phase mode, and the reverse phase mode described in (1) to (4) below can be selected by the transmitter 49.

(1) A first direction operation mode in which the right and left wheels 5, 6 on one side are directionally operated by the first direction operation motor 13 in a state in which the right and left wheels 5, 6 on the other side are fixed in the straight-ahead position;

(2) a second directional operation mode in which the right and left wheels 5, 6 on one side are directionally operated by the second directional operation motor 14 in a state in which the right and left wheels 5, 6 on the other side are fixed in the straight-ahead position;

(3) an in-phase mode in which the lawnmower is moved in parallel by the first direction operating motor 13 and the second direction operating motor 14 by operating the right and left wheels 5, 6 on the one side and the other side in the same direction;

(4) a reverse phase mode in which the first direction operation motor 13 and the second direction operation motor 14 operate the right and left wheels 5 and 6 on the one side and the other side in directions opposite to each other to rotate the mower reel.

When mowing a slope, the following operations may be repeated: the mowing operation is performed while traveling along the contour of the slope from one end of the slope to the other end, and if the mower reaches the other end of the slope, the mower is moved slightly downward or upward along the slope, and travels along the contour of the slope from the other end of the slope to the one end of the slope while traveling.

In the mowing operation described above, according to the mower of the present invention, the right wheel 5 on the engine 4 side may travel along the contour line in a state where it is on the mountain side (upper side) of the slope and the left wheel 6 on the opposite side to the engine 4 is on the valley side (lower side) of the slope.

When the lawnmower reaches one (the other) end of the slope, the direction operation of the lawnmower may be performed based on one of the first direction operation mode, the second direction operation mode, the in-phase mode, and the anti-phase mode described in (1) to (4), and the forward and backward movement operation of the lawnmower may be performed to move the lawnmower slightly downward or upward along the slope.

(first other embodiment of the invention)

As shown in fig. 8, among the plurality of convex portions 39 of the left wheel 6, 2 rows along the rotation direction a1 of the wheels 5, 6 may be arranged so that the positions of the intervals W1 and the convex portions 39 are aligned in the left-right direction of the blade housing 1 by shifting the interval W1 of the 2 rows.

(second other embodiment of the invention)

As shown in fig. 9 and 10, the convex portion 39 of the right land portion 37 and the convex portion 39 of the left land portion 37 may be oriented in opposite directions in 2 rows along the rotation direction a1 of the wheels 5 and 6 among the plurality of convex portions 39 of the left wheel 6.

In the configuration shown in fig. 9 and 10, the 2-row interval W1 may be shifted so that the position of the interval W1 and the convex portion 39 are aligned in the left-right direction of the blade housing 1 as shown in fig. 8.

(third other embodiment of the invention)

As shown in fig. 11, the direction of the convex portions 39 may be alternately opposite in the 1 row along the rotation direction a1 of the wheels 5, 6 among the plurality of convex portions 39 of the right wheel 5.

The structure shown in fig. 11 may be applied to the left wheel 6 shown in the above-described (specific embodiment) (first another embodiment of the invention) (second another embodiment of the invention).

(fourth other embodiment of the invention)

Of the rows along the rotation direction a1 of the wheels 5, 6 among the plurality of convex portions 39 of the right and left wheels 5, 6, the row of the right wheel 5 may be 2 rows, and the row of the left wheel 6 may be 3 rows.

The lateral width W2 of the right wheel 5 and the lateral width W3 of the left wheel 6 may be the same, and the number of the right wheel 5 and the left wheel 6 may be the same.

In the row along the rotation direction a1 of the wheels 5, 6 among the plurality of convex portions 39 of the right and left wheels 5, 6, the number of convex portions 39 may be 3, 5, 6, or the like instead of 4.

In the left wheel 6, the rib 38 may also be formed between the right land portion 37 and the left land portion 37.

(fifth other embodiment of the invention)

In the convex portion 39, instead of bending the middle portion 40 of the convex portion 39 and having the first portion 41 and the second portion 42 of the convex portion 39, the first portion 41 and the second portion 42 of the convex portion 39 may be divided into separate members and the first portion 41 and the second portion 42 of the convex portion 39 may be butted.

According to this structure, the portion where the first portion 41 and the second portion 42 of the convex portion 39 are butted is the portion where the first portion 41 and the second portion 42 of the convex portion 39 are connected to each other. In this case, at the portion where the first portion 41 and the second portion 42 of the convex portion 39 are butted, a slight gap may be provided between the first portion 41 and the second portion 42 of the convex portion 39.

(sixth other embodiment of the invention)

As shown in fig. 12, in the right wheel 5, a disc-shaped (annular) balance weight 43 may be coupled to the outer surface (the surface opposite to the blade housing 1) of the first lateral portion 35 concentrically with the right wheel 5.

Similarly, a disc-shaped (annular) balance weight 43 may be coupled to the outer surface (the surface on the cutting blade housing 1 side) of the second lateral portion 36 concentrically with the right wheel 5.

In this case, the outer end portion 43a of the balance weight 43 may be located at the same position as the land portion 37, at a position slightly protruding outward in the radial direction from the land portion 37, or at a position slightly closer to the axles 33 and 34 in the radial direction from the land portion 37.

(seventh other embodiment of the invention)

As shown in fig. 13, in the right wheel 5, a disc-shaped (annular) balance weight 43 may be connected to the axle 33 or the axle 34 concentrically with the right wheel 5 so as to be positioned outside the first lateral portion 35 (on the side opposite to the blade housing 1).

Similarly, a disc-shaped (annular) balance weight 43 may be connected to the axle 33 or the axle 34 concentrically with the right wheel 5 so as to be positioned outside the second lateral side portion 36 (on the side of the blade housing 1).

In this case, the outer end portion 43a of the balance weight 43 may be located at the same position as the land portion 37, at a position slightly protruding outward in the radial direction from the land portion 37, or at a position slightly closer to the axles 33 and 34 in the radial direction from the land portion 37.

(eighth other embodiment of the invention)

Instead of providing 1 disc-shaped (annular) balance weight 43 on the right wheel 5, a plurality of disc-shaped (annular) balance weights 43 may be provided on the right wheel 5.

In this case, as shown in fig. 5, a part of the balance weight 43 may be provided inside the right wheel 5, and the remaining balance weight 43 may be provided outside the right wheel 5 as described above (the first other embodiment of the invention) (the second other embodiment of the invention).

Instead of 1 continuous disc-shaped (annular) balance weight 43, a plurality of balance weights 43 may be provided so as to be arranged at equal intervals in the circumferential direction of the right wheel 5.

(ninth other embodiment of the invention)

The engine 4 may be disposed (supported) between the left wheels 6 in a plan view, and the balance weight 43 may be provided on the left wheels 6.

According to this configuration, the right wheel 5 may be configured as the left wheel 6 described above (embodiment) (first another embodiment of the invention) to (fifth another embodiment of the invention), and the left wheel 6 may be configured as the right wheel 5 described above (embodiment) (first another embodiment of the invention) to (eighth another embodiment of the invention).

(tenth other embodiment of the invention)

The engine 4 may be disposed (supported) between the left wheels 6 in a plan view, and the balance weight may be provided on the left wheels 6. With this configuration, the cutting blade housing 1 may have an opening 55c in the lateral side portion 55b of the right lateral portion 55.

(eleventh other embodiment of the invention)

The blade housing 1 may have an opening 55c in a lateral side portion 55b of the right and left lateral portions 55.

Instead of the detachable lid 70, the lid 70 may be attached to the lateral side 55b of the lateral portion 55 by a hinge member (not shown) so that the lid 70 is opened and closed by swinging.

(twelfth alternative embodiment of the invention)

Instead of the engine 4, an electric motor (not shown) and a battery (not shown) may be provided as a prime mover. According to this configuration, the electric motors for driving the wheels 5 and 6 and the electric motor for driving the cutting blade 2 may be provided separately.

Industrial applicability

The present invention is applicable not only to a remotely operated work machine that is operated wirelessly, but also to an automatic travel work machine that detects obstacles such as trees using a radar sensor or the like and automatically travels while avoiding the obstacles; a walking type working machine in which a long handle is extended from a machine body and an operator grasps the handle to perform various operations.

The present invention is applicable not only to a lawnmower but also to a working machine having a tilling device (corresponding to a working device) for tilling the ground; a working machine having a dispenser (corresponding to a working device) for dispensing a chemical, water, or the like.

Description of the indicia

1 machine body

2 working device

4 prime mover

5. 6 wheel

33. 34 axle

35 first lateral side

36 second lateral side

37 ground part

39 convex part

40 middle part

41 first part

Part 41a

42 second part

Portion 42a

43 balance weight

43a outer end

50 cover part

54a upper side part

55b lateral side

55c opening part

70 cover part

Direction of rotation A1

Center of CL right and left

W1 interval

W2 transverse width

W3 transverse width

P5 axial core.