阅读说明：本技术 一种新型微耕机变速箱 (Novel gearbox of mini-tiller ) 是由 沈洪彬 孙金宇 廖鹏军 于 2020-07-16 设计创作，主要内容包括：本发明公开了一种新型微耕机变速箱,包括一体化设置的铝合金制外壳,铝合金制外壳由位于上端且水平走向的齿轮壳和位于垂直下端且斜向走向的输出壳构成,齿轮壳内安装有换挡齿轮组,输出壳内安装有与换挡齿轮组连接的动力输出齿轮组,输出壳的底部在垂直方向上突出于齿轮壳的后端端部,输出壳的轴线与垂直方向的夹角为1-30°,改变了内部结构,整机重心后移,使动力输出齿轮组与重心的垂直线形成夹角1-30度,保证整机不倾斜,不前坠,解决了坡度行走的平衡问题；缩小了容积,降低成本,不需要上下连接,提高了人工生产效率,提高了产品精度及质量可靠性,重量轻,使用轻便灵活,适用于丘陵山区,老龄人群。(The invention discloses a novel mini-tiller gearbox, which comprises an integrally arranged aluminum alloy shell, wherein the aluminum alloy shell consists of a gear shell positioned at the upper end and in a horizontal direction and an output shell positioned at the vertical lower end and in an oblique direction, a gear shifting gear set is arranged in the gear shell, a power output gear set connected with the gear shifting gear set is arranged in the output shell, the bottom of the output shell protrudes out of the end part of the rear end of the gear shell in the vertical direction, the included angle between the axis of the output shell and the vertical direction is 1-30 degrees, the internal structure is changed, the gravity center of the whole tiller is moved backwards, the included angle between the power output gear set and the vertical line of the gravity center is 1-30 degrees, the whole tiller is ensured not to incline and not to front-fall, and; the volume is reduced, the cost is reduced, the vertical connection is not needed, the manual production efficiency is improved, the product precision and the quality reliability are improved, the weight is light, the use is light and flexible, and the device is suitable for hilly mountain areas and old people.)

1. The utility model provides a novel plough quick-witted gearbox a little, characterized by: the aluminum alloy system shell (1) that sets up including the integration, aluminum alloy system shell (1) comprises gear shell (2) that are located upper end and level trend and output shell (3) that are located perpendicular lower extreme and slant trend, install the gear shifting gear train in gear shell (2), install in output shell (3) with the power take off gear train that the gear shifting gear train is connected, the bottom of output shell (3) in the vertical direction outstanding in the rear end tip of gear shell (2).

2. The novel gearbox of the mini-tiller as claimed in claim 1, characterized in that: the included angle between the axis of the output shell (3) and the vertical direction is 1-30 degrees.

3. The novel gearbox of the mini-tiller as claimed in claim 1, characterized in that: the gear shifting gear set comprises a power input shaft (4), a first gear shifting shaft (5), a second gear shifting shaft (6) and a gear shifting output shaft (7) which are horizontally arranged, wherein the axis of the power input shaft (4) and the axis (7) of the gear shifting output shaft are positioned on the same vertical line, the first gear shifting shaft (5) is positioned on one side of the power input shaft (4) in the horizontal direction, the first gear shifting shaft (5) is slightly higher than the power input shaft (4) in the vertical direction, the second gear shifting shaft (6) is positioned between the second gear shifting shaft (6) and the gear shifting output shaft (7) in the vertical direction, and the second gear shifting shaft (6) is positioned between the power input shaft (4) and the first gear shifting shaft (5) in the horizontal direction;

The middle part of the power input shaft (4) is sequentially provided with a first driving gear (8) and a second driving gear (9) which are linked from front to back;

a first transmission gear (10), a second transmission gear (11) and a third transmission gear (12) are fixedly sleeved on the first gear shifting shaft (5) from front to back in sequence, and the first transmission gear (10) and the second transmission gear (11) can be meshed with the first driving gear (8) and the second driving gear (9) respectively;

a fourth transmission gear (13) and a fifth transmission gear (14) are fixedly sleeved on the second gear shifting shaft (6) from front to back in sequence, the fourth transmission gear (13) is meshed with the second transmission gear (11), and the fifth transmission gear (14) can be meshed with the second driving gear (9);

a sixth transmission gear (15) meshed with the third transmission gear (12) is fixedly sleeved at the rear end of the gear shifting output shaft (7), and a first conical gear (16) is fixedly sleeved at the front end of the gear shifting output shaft;

the power take-off gear group includes power transmission axle (17) that the vertical slope moves towards and power take-off (18) that the level moved towards, power transmission axle (17) perpendicular to power take-off (18), the fixed cover in upper end of power transmission axle (17) connect with first sector gear (51) of first conical gear (16) meshing, the fixed second sector gear (19) that has cup jointed in middle part of power take-off (18), the fixed cover of lower extreme of power transmission axle (17) connect with second conical gear (20) of second sector gear (19) meshing.

4. The novel gearbox of the mini-tiller as claimed in claim 3, characterized in that: the diameter of the first driving gear (8) is larger than that of the second driving gear (9), the diameters of the second transmission gear (11), the first transmission gear (10) and the third transmission gear (12) are sequentially decreased in a decreasing mode, and the diameter of the fourth transmission gear (13) is smaller than that of the fifth transmission gear (14).

5. The novel gearbox of the mini-tiller as claimed in claim 3, characterized in that: the front end of power input shaft (4) still fixed cover have connect a separation and reunion cover (21), it can imbed to cup joint on power input shaft (4) separation and reunion drum (22) in separation and reunion cover (21), but articulated on gear housing (2) have circumference wobbling separation and reunion to dial cover (23), the lower extreme integration that the cover (23) was dialled in the separation and reunion is provided with downwardly extending separation and reunion shift fork (24).

6. The novel gearbox of the mini-tiller as claimed in claim 5, characterized in that: the clutch shifting sleeve (23) is sleeved on a first shifting fork shaft (25) hinged to the gear shell (2), one end of the first shifting fork shaft (25) extends out of the gear shell (25) and is fixedly connected with a first shifting piece (26).

7. The novel gearbox of the mini-tiller as claimed in claim 3, characterized in that: first driving gear (8) and second driving gear (9) integration set up on a gear sleeve (27), gear sleeve (25) extend to the front end and are provided with gear shifting groove (28), it has gear shift fork (29) to articulate on gear shell (2), the lower extreme of gear shift fork (29) is provided with the axial embedding shift fork slider (30) of gear shifting groove (28), stretch out the upper end of gear shift fork (29) gear shell (2) outer and fixedly connected with second plectrum (31).

8. The novel gearbox of the mini-tiller as claimed in claim 3, characterized in that: a first assembly maintenance hole is formed in the bottom of the output shell (3), and a sealing bolt (33) is connected to the first assembly maintenance hole in a threaded mode; a first accommodating cavity matched with the second sector gear (19) and the second bevel gear (20) is formed in the lower end of the output shell (3), and a first side cover (34) is opened on the side face of the first accommodating cavity and covered with the first accommodating cavity; the top of gear shell (2) is provided with second equipment maintenance hole, second equipment maintenance hole upper cover has closed top cap (35), the rear end tip of gear shell (2) is provided with rear end pivot holding mouth, rear end pivot holding mouth upper cover have closed with first side cap (36) that pivot holding mouth suited, the front end tip of gear shell (2) is provided with clutch maintenance mouth, clutch maintenance mouth upper cover have with clutch maintenance mouth is to second side cap (37) of adaptation.

9. The novel gearbox of the mini-tiller as claimed in claim 8, characterized in that: a first bearing (38) positioned in the first accommodating cavity is sleeved on the power output shaft (18), and a second bearing (39) positioned in the first side cover (34) is sleeved on the power output shaft (18);

the upper end of the power transmission shaft (17) is sleeved with a third bearing (40), and the lower end of the power transmission shaft is sleeved with a fourth bearing (41);

a rotating shaft fixing frame (42) is arranged in the middle of the gear shell (2), and the first gear shifting shaft (5), the second gear shifting shaft (6) and the gear shifting output shaft (7) are all placed on the rotating shaft fixing frame (42) and the rear end of the gear shell (2); a fifth bearing (52) is arranged between the first gear shifting shaft (5) and the rotating shaft fixing frame (42), and a sixth bearing (43) is arranged between the first gear shifting shaft (5) and the rear end of the gear shell (2); a seventh bearing (44) is arranged between the second gear shifting shaft (6) and the rotating shaft fixing frame (42), and an eighth bearing (45) is arranged between the second gear shifting shaft (6) and the rear end of the gear shell (2); a ninth bearing (46) is arranged between the gear shifting output shaft (7) and the rotating shaft fixing frame (42), and a tenth bearing (47) is arranged between the gear shifting output shaft (7) and the rear end of the gear shell (2).

10. The novel gearbox of the mini-tiller as claimed in claim 3, characterized in that: the top of power transmission axle (17) is provided with spacer pin (48), the upper end of power transmission axle (17) still cup joints spacing open nut (49) that is located first sector gear (51) top, spacing open nut (49) are provided with the holding spacer pin (48) spacing groove (50).

Technical Field

The invention relates to the technical field of gearboxes, in particular to a novel gearbox of a mini-tiller.

Background

The mini-tiller is an agricultural machine widely applied to farmlands such as mountainous regions and the like, is small in size, flexible and popular to use, but a gearbox adopted by a power system of the mini-tiller on the market at present is generally of a split assembly type, is formed by locking an upper gearbox positioned at the upper end and a lower walking box positioned at the lower end through bolts, is large in volume and high in engine oil consumption, the upper gearbox belongs to an aluminum product, and the lower walking box is made of cast iron and is heavy in weight; the power is transmitted between the upper gear box and the lower walking box by the sector gear, the sector gear is at a right angle of 90 degrees, and the gear set in the upper gear box is large in size and inclines forwards, so that the center of gravity of the whole gear box inclines forwards to cause the front heavy and the back light, when the gear box is assembled on the micro-cultivator, the micro-cultivator is easy to overturn forwards without automatic balance, and the gear box is easy to contact with the ground during the walking process or operation in hilly lands, small-field mountain lands, rugged roads, muddy fields and the like, and the walking is blocked; moreover, after a long period of use, the bolts between the upper gearbox and the lower running gearbox are easily worn out to cause oil leakage problems.

Therefore, the technical personnel in the field are dedicated to developing a novel gearbox of the mini-tiller, which has light weight and small volume and can automatically balance.

Disclosure of Invention

In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a novel gearbox of a mini-tiller, which is light in weight, small in volume and capable of automatic balancing.

In order to achieve the purpose, the invention provides a novel mini-tiller gearbox, which comprises an integrally arranged aluminum alloy shell, wherein the aluminum alloy shell is composed of a gear shell and an output shell, the gear shell is located at the upper end and in the horizontal direction, the output shell is located at the vertical lower end and in the oblique direction, a gear shifting gear set is installed in the gear shell, a power output gear set connected with the gear shifting gear set is installed in the output shell, and the bottom of the output shell protrudes out of the end part of the rear end of the gear shell in the vertical direction.

The included angle between the axis of the output shell and the vertical direction is 1-30 degrees.

The gear shifting gear set comprises a power input shaft, a first gear shifting shaft, a second gear shifting shaft and a gear shifting output shaft which are horizontally arranged, wherein the axis of the power input shaft and the axis of the gear shifting output shaft are positioned on the same vertical line, the first gear shifting shaft is positioned on one side of the power input shaft in the horizontal direction, the first gear shifting shaft is slightly higher than the power input shaft in the vertical direction, the second gear shifting shaft is positioned between the second gear shifting shaft and the gear shifting output shaft in the vertical direction, and the second gear shifting shaft is positioned between the power input shaft and the first gear shifting shaft in the horizontal direction.

And the middle part of the power input shaft is sequentially provided with a first driving gear and a second driving gear which are linked from front to back.

The first gear shifting shaft is fixedly sleeved with a first transmission gear, a second transmission gear and a third transmission gear from front to back in sequence, and the first transmission gear and the second transmission gear can be meshed with the first driving gear and the second driving gear respectively.

A fourth transmission gear and a fifth transmission gear are fixedly sleeved on the second gear shifting shaft from front to back in sequence, the fourth transmission gear is meshed with the second transmission gear, and the fifth transmission gear can be meshed with the second driving gear.

And a sixth transmission gear meshed with the third transmission gear is fixedly sleeved at the rear end of the gear shifting output shaft, and a first conical gear is fixedly sleeved at the front end of the gear shifting output shaft.

The power output gear set comprises a power transmission shaft with a longitudinal inclined trend and a power output shaft with a horizontal trend, the power transmission shaft is perpendicular to the power output shaft, a first sector gear meshed with the first bevel gear is fixedly sleeved at the upper end of the power transmission shaft, a second sector gear is fixedly sleeved at the middle part of the power output shaft, and a second cone gear meshed with the second sector gear is fixedly sleeved at the lower end of the power transmission shaft.

The diameter of the first driving gear is larger than that of the second driving gear, the diameters of the second transmission gear, the first transmission gear and the third transmission gear are sequentially decreased progressively, and the diameter of the fourth transmission gear is smaller than that of the fifth transmission gear.

The front end of the power input shaft is also fixedly sleeved with a clutch cover, the power input shaft is sleeved with a clutch drum which can be embedded into the clutch cover, the gear shell is hinged with a clutch shifting sleeve which can swing circumferentially, and the lower end of the clutch shifting sleeve is integrally provided with a downward extending clutch shifting fork.

The clutch shifting sleeve is sleeved on a first shifting fork shaft hinged with the gear shell, and one end of the first shifting fork shaft extends out of the gear sleeve and is fixedly connected with a first shifting piece.

The integrated setting of first driving gear and second driving gear is sheathe in a gear, gear cover extends to the front end and is provided with the shift groove of dialling, it has the gear shift fork to articulate on the gear casing, the lower extreme of gear shift fork is provided with the axial embedding the shift fork slider in shift groove of dialling, stretch out the upper end of gear shift fork the gear cover is outer and fixedly connected with second plectrum.

A first assembly maintenance hole is formed in the bottom of the output shell, and a sealing bolt is connected to the first assembly maintenance hole in a threaded mode; a first accommodating cavity matched with the second sector gear and the second bevel gear is formed in the lower end of the output shell, and the side surface of the first accommodating cavity is opened and covered with a first side cover; the top of gear shell is provided with second equipment maintenance hole, second equipment maintenance hole upper cover has closed the top cap, the rear end tip of gear shell is provided with rear end pivot holding mouth, rear end pivot holding mouth upper cover have with the first side cap that pivot holding mouth suited, the front end tip of gear shell is provided with clutch maintenance mouth, clutch maintenance mouth upper cover have with clutch maintenance mouth is to the second side cap that adapts to.

The power output shaft is sleeved with a first bearing located in the first accommodating cavity, and the power output shaft is further sleeved with a second bearing located in the first side cover.

And the upper end of the power transmission shaft is sleeved with a third bearing, and the lower end of the power transmission shaft is sleeved with a fourth bearing.

A rotating shaft fixing frame is arranged in the middle of the gear shell, and the first gear shifting shaft, the second gear shifting shaft and the gear shifting output shaft are all placed on the rotating shaft fixing frame and the rear end of the gear shell; a fifth bearing is arranged between the first gear shifting shaft and the rotating shaft fixing frame, and a sixth bearing is arranged between the first gear shifting shaft and the rear end of the gear shell; a seventh bearing is arranged between the second gear shifting shaft and the rotating shaft fixing frame, and an eighth bearing is arranged between the second gear shifting shaft and the rear end of the gear shell; a ninth bearing is arranged between the gear shifting output shaft and the rotating shaft fixing frame, and a tenth bearing is arranged between the gear shifting output shaft and the rear end of the gear shell.

The top end of the power transmission shaft is provided with a limiting pin, the upper end of the power transmission shaft is further sleeved with a limiting open nut located above the first sector gear, and the limiting open nut is provided with a limiting groove for containing the limiting pin.

The invention has the beneficial effects that: the novel gearbox of the mini-tiller comprises an integrally arranged aluminum alloy shell, wherein the aluminum alloy shell is composed of a gear shell which is positioned at the upper end and moves horizontally and an output shell which is positioned at the vertical lower end and moves obliquely, a gear shifting gear set is installed in the gear shell, a power output gear set connected with the gear shifting gear set is installed in the output shell, the bottom of the output shell protrudes out of the end part of the rear end of the gear shell in the vertical direction, the included angle between the axis of the output shell and the vertical direction is 1-30 degrees, the internal structure is changed, the gravity center of the whole tiller is moved backwards, the included angle between the power output gear set and the vertical line of the gravity center is 1-30 degrees, the whole tiller is ensured not to incline and front-fall, and the; the volume is reduced, the cost is reduced, the vertical connection is not needed, the manual production efficiency is improved, the product precision and the quality reliability are improved, the weight is light, the use is light and flexible, and the device is suitable for hilly mountain areas and old people.

Drawings

FIG. 1 is one of the schematic structural diagrams of the present invention;

FIG. 2 is a second schematic structural diagram of the present invention;

FIG. 3 is a partial schematic view of the present invention;

FIG. 4 is a second partial schematic view of the present invention;

FIG. 5 is a third schematic diagram of a partial structure of the present invention;

FIG. 6 is a fourth schematic diagram of a partial structure of the present invention;

FIG. 7 is a third schematic structural diagram of the present invention;

FIG. 8 is a schematic structural view of an aluminum alloy case of the present invention;

fig. 9 is a structural sectional view of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples, wherein the terms "upper", "lower", "left", "right", "inner", "outer", and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is for convenience and simplicity of description, and does not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular manner, and thus should not be construed as limiting the present invention. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 1 to 9, a novel mini-tiller gearbox comprises an integrally arranged aluminum alloy housing 1, wherein the aluminum alloy housing 1 is composed of a gear housing 2 located at the upper end and in a horizontal direction and an output housing 3 located at the vertical lower end and in an oblique direction, a gear shifting gear set is installed in the gear housing 2, a power output gear set connected with the gear shifting gear set is installed in the output housing 3, and the bottom of the output housing 3 protrudes out of the rear end of the gear housing 2 in the vertical direction; compared with the original mode, the inclined arrangement of the output shell 3 changes the gravity center, so that the gravity center is centered, the gravity center of the whole machine moves backwards, and the whole machine is ensured not to incline and fall forwards.

The gear shifting gear set comprises a power input shaft 4, a first gear shifting shaft 5, a second gear shifting shaft 6 and a gear shifting output shaft 7 which are horizontally arranged, wherein the axis of the power input shaft 4 and the axis 7 of the gear shifting output shaft are positioned on the same vertical line, the first gear shifting shaft 5 is positioned on one side of the power input shaft 4 in the horizontal direction, the first gear shifting shaft 5 is slightly higher than the power input shaft 4 in the vertical direction, the second gear shifting shaft 6 is positioned between the second gear shifting shaft 6 and the gear shifting output shaft 7 in the vertical direction, and the second gear shifting shaft 6 is positioned between the power input shaft 4 and the first gear shifting shaft 5 in the horizontal direction;

the middle part of the power input shaft 4 is provided with a first driving gear 8 and a second driving gear 9 which are linked in sequence from front to back, and the diameter of the first driving gear 8 is larger than that of the second driving gear 9.

A first transmission gear 10, a second transmission gear 11 and a third transmission gear 12 are fixedly sleeved on the first gear shifting shaft 5 from front to back in sequence, the first transmission gear 10 and the second transmission gear 11 can be respectively meshed with the first driving gear 8 and the second driving gear 9, and the diameters of the second transmission gear 11, the first transmission gear 10 and the third transmission gear 12 are sequentially decreased progressively.

A fourth transmission gear 13 and a fifth transmission gear 14 are fixedly sleeved on the second gear shifting shaft 6 from front to back in sequence, the diameter of the fourth transmission gear 13 is smaller than that of the fifth transmission gear 14, the fourth transmission gear 13 is meshed with the second transmission gear 11, and the fifth transmission gear 14 can be meshed with the second driving gear 9.

The rear end of the gear shifting output shaft 7 is fixedly sleeved with a sixth transmission gear 15 meshed with the third transmission gear 12, and the front end of the gear shifting output shaft is fixedly sleeved with a first conical gear 16.

The power output gear set comprises a power transmission shaft 17 in a longitudinal inclined direction and a power output shaft 18 in a horizontal direction, the power transmission shaft 17 is perpendicular to the power output shaft 18, a first sector gear 51 meshed with the first conical gear 16 is fixedly sleeved at the upper end of the power transmission shaft 17, a second sector gear 19 is fixedly sleeved at the middle of the power output shaft 18, and a second conical gear 20 meshed with the second sector gear 19 is fixedly sleeved at the lower end of the power transmission shaft 17.

Above-mentioned power take off gear train and gear shifting gear train compact structure, each gear is exquisite to be cooperated, and gear shifting gear train adopts four-axis transmission, has changed traditional transmission connected mode, and the assembly of four-axis monodentate is light, and convenient assembling has promoted labor efficiency, has reduced intensity of labour. The four-shaft transmission speed change mechanism has the advantages of changing the internal structure, reducing the volume and reducing the cost, along with more flexible four-shaft transmission speed change, more portable gear, light weight and convenient and flexible use, and is suitable for hilly mountain areas and old people. The four-shaft transmission is more flexible in speed change and lighter in gear, and the problem that the gear is difficult to trip easily is solved.

In the embodiment, because the direction of the power transmission shaft 17 is consistent with the axial direction of the output shell 3, the included angle between the direction of the power transmission shaft 17 and the vertical direction is a, the included angle between the axial direction of the output shell 3 and the vertical direction is a, the value range of a is 1-30 degrees, the gravity center of the whole gearbox moves backwards in the angle range, the whole gearbox is ensured not to incline and front-end drop, and the balance can be automatically corrected.

The front end of the power input shaft 4 is also fixedly sleeved with a clutch cover 21, the power input shaft 4 is sleeved with a clutch drum 22 which can be embedded into the clutch cover 21, the gear shell 2 is hinged with a clutch shifting sleeve 23 which can swing circumferentially, and the lower end of the clutch shifting sleeve 23 is integrally provided with a clutch shifting fork 24 which extends downwards.

The clutch shifting sleeve 23 is sleeved on a first shifting fork shaft 25 hinged with the gear shell 2, and one end of the first shifting fork shaft 25 extends out of the gear sleeve 25 and is fixedly connected with a first shifting piece 26.

First driving gear 8 and the integration of second driving gear 9 set up on a gear cover 27, and gear cover 27 extends to the front end and is provided with gear shifting groove 28, and it has gear shift fork 29 to articulate on gear shell 2, and the lower extreme of gear shift fork 29 is provided with the shift fork slider 30 of axial embedding gear shifting groove 28, and gear shift fork 29's upper end stretches out gear shell 2 outside and fixedly connected with second plectrum 31.

The bottom of the output shell 3 is provided with a first assembly maintenance hole, and a sealing bolt 33 is connected to the first assembly maintenance hole in a threaded manner; the lower end of the output shell 3 is provided with a first accommodating cavity matched with the second sector gear 19 and the second bevel gear 20, the side surface of the first accommodating cavity is opened and covered with a first side cover 34; the top of gear shell 2 is provided with the second equipment maintenance hole, second equipment maintenance hole upper cover has closed top cap 35, the rear end tip of gear shell 2 is provided with rear end pivot holding mouth, rear end pivot holding mouth upper cover has closed the first side lid 36 that suits with pivot holding mouth, the front end tip of gear shell 2 is provided with clutch maintenance mouth, clutch maintenance mouth upper cover has closed the second side lid 37 to the adaptation with clutch maintenance mouth, moreover, the steam generator is simple in structure, and the dismouting maintenance is facilitated.

A first bearing 38 positioned in the first accommodating cavity is sleeved on the power output shaft 18, and a second bearing 39 positioned in the first side cover 34 is sleeved on the power output shaft 18; the upper end of the power transmission shaft 17 is sleeved with a third bearing 40, and the lower end is sleeved with a fourth bearing 41; a rotating shaft fixing frame 42 is arranged in the middle of the gear shell 2, and the first gear shifting shaft 5, the second gear shifting shaft 6 and the gear shifting output shaft 7 are all placed on the rotating shaft fixing frame 42 and the rear end of the gear shell 2; a fifth bearing 52 is arranged between the first gear shift shaft 5 and the rotating shaft fixing frame 42, and a sixth bearing 43 is arranged between the first gear shift shaft 5 and the rear end of the gear shell 2; a seventh bearing 44 is arranged between the second shift shaft 6 and the rotating shaft fixing frame 42, and an eighth bearing 45 is arranged between the second shift shaft 6 and the rear end of the gear shell 2; a ninth bearing 46 is arranged between the gear shifting output shaft 7 and the rotating shaft fixing frame 42, a tenth bearing 47 is arranged between the gear shifting output shaft 7 and the rear end of the gear shell 2, an eleventh bearing 53 is arranged between the rear end of the power input shaft 4 and the rear end of the gear shell 2, and a twelfth bearing 54 is arranged between the front end of the power input shaft 4 and the clutch cover 21.

The top of power transmission axle 17 is provided with spacing round pin 48, and the upper end of power transmission axle 17 still cup joints the spacing split nut 49 that is located first sector gear 51 top, and spacing split nut 49 is provided with the spacing groove 50 of holding spacing round pin 48, and when power transmission axle 17 rotated, spacing round pin 48 was firm with first sector gear 51 suppression on power transmission axle 17, avoided first sector gear 51 to break away from power transmission axle 17 because of the effect of self-transmission centrifugal force.

The working principle of the invention is as follows:

a power mechanism such as a rotating shaft of a motor is connected with the power input shaft 4, when the clutch shifting fork 24 is shifted to enable the clutch drum 22 to be separated from the clutch cover 21, no power is output at the moment; when the clutch fork 24 is shifted to enable the clutch drum 22 to be separated from the clutch cover 21, no power is output to the first gear shifting shaft 5, the second gear shifting shaft 6, the gear shifting output shaft 7, the power transmission shaft 17 and the power output shaft 18 below, and the mini-tiller idles.

Make the clutch drum 22 support the clutch cover 21 when stirring the clutch shift fork 24, the pivot of motor drives power input shaft 4 and rotates like this, stirs second plectrum 31 this moment, can adjust out the power take off mode of three different gears, and first gear power take off's power transmission route is: the power input shaft 4, the first driving gear 8, the first transmission gear 10, the first gear shifting shaft 5, the third transmission gear 12, the sixth transmission gear 15, the gear shifting output shaft 7 and the first bevel gear 16 are finally transmitted to the power output shaft 18 through the power transmission shaft 17 and the two sector gears.

The power transmission path of the power output of the second gear is as follows: the power input shaft 4, the second driving gear 9, the second transmission gear 11, the first gear shifting shaft 5, the third transmission gear 12, the sixth transmission gear 15, the gear shifting output shaft 7 and the first bevel gear 16 are finally transmitted to the power output shaft 18 through the power transmission shaft 17 and the two sector gears.

The power transmission path of the power output of the third gear is as follows: the power input shaft 4, the second driving gear 9, the fifth transmission gear 14, the second gear shifting shaft 6, the fourth transmission gear 13, the second transmission gear 11, the first gear shifting shaft 5, the third transmission gear 12, the sixth transmission gear 15, the gear shifting output shaft 7 and the first bevel gear 16 are finally transmitted to the power output shaft 18 through the power transmission shaft 17 and the two sector gears.

The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.