阅读说明：本技术 一种多档位操纵机构及轻型压路机 (Multi-gear operating mechanism and light road roller ) 是由 姜右良 王翠艳 吴闯 王颖 于 2021-07-07 设计创作，主要内容包括：本发明公开了一种多档位操纵机构及轻型压路机,该操纵机构包括操纵平台、连接在在操纵平台下方的传动轴、软轴支架以及连接在传动轴端部的操作手柄；传动轴上设有档位拨片和用于控制柱塞泵流量的软轴拨片；软轴支架上连接有阶梯板,阶梯板上设有中位凹槽,中位凹槽两侧均设有一级台阶和二级台阶,且一级台阶位于二级台阶和中位凹槽之间；操作手柄通过传动轴使档位拨片处于中位凹槽或一级台阶或二级台阶中,当档位拨片处于中位凹槽处时,软轴拨片使柱塞泵流量的流量为零,档位拨片从一级台阶向二级台阶运动时,软轴拨片使柱塞泵的流量逐渐增大。本申请便于对车速的控制,还可防止误操作手柄导致的车速突然增加。(The invention discloses a multi-gear control mechanism and a light road roller, wherein the control mechanism comprises a control platform, a transmission shaft connected below the control platform, a flexible shaft bracket and an operating handle connected to the end part of the transmission shaft; a gear shifting piece and a flexible shaft shifting piece for controlling the flow of the plunger pump are arranged on the transmission shaft; a step plate is connected to the flexible shaft support, a middle groove is formed in the step plate, a first-stage step and a second-stage step are arranged on two sides of the middle groove, and the first-stage step is located between the second-stage step and the middle groove; the operating handle enables the gear shifting piece to be located in the middle position groove or the first-stage step or the second-stage step through the transmission shaft, when the gear shifting piece is located at the middle position groove, the flexible shaft shifting piece enables the flow of the plunger pump to be zero, and when the gear shifting piece moves from the first-stage step to the second-stage step, the flexible shaft shifting piece enables the flow of the plunger pump to be gradually increased. This application is convenient for to the control of the speed of a motor vehicle, still can prevent the speed of a motor vehicle that the maloperation handle leads to and increase suddenly.)

1. A multi-gear control mechanism is characterized by comprising a control platform (1), a transmission shaft (3) connected below the control platform (1), a flexible shaft bracket (4) and an operating handle (2) connected to the end part of the transmission shaft (3);

a gear shifting piece (25) and a flexible shaft shifting piece (28) for controlling the flow of the plunger pump are arranged on the transmission shaft (3);

a step plate (31) is connected to the flexible shaft support (4), a middle groove is formed in the step plate (31), a first-stage step and a second-stage step are arranged on two sides of the middle groove, and the first-stage step is located between the second-stage step and the middle groove;

the operating handle (2) enables the gear shifting piece (25) to be located in a middle position groove or a first-stage step or a second-stage step through the transmission shaft (3), when the gear shifting piece (25) is located at the middle position groove, the flexible shaft shifting piece (28) enables the flow of the plunger pump to be zero, and when the gear shifting piece (25) moves from the first-stage step to the second-stage step, the flexible shaft shifting piece (28) enables the flow of the plunger pump to be gradually increased.

2. The multi-gear operating mechanism according to claim 1, wherein the transmission shaft (3) comprises a sleeve (19) and at least two connecting blocks (23) connected to the bottom surface of the operating platform (1), the sleeve (19) is rotatably connected in holes of the plurality of connecting blocks (23), and a central shaft (17) is sleeved in the sleeve (19);

the gear shifting piece (25) is connected to the periphery of the sleeve (19) in a sliding manner and is fixedly connected with the central shaft (17) through a connecting piece, and a spring (24) is arranged between the gear shifting piece (25) and one of the connecting blocks (23); when the gear shifting piece (25) is positioned at the middle position groove, the spring (24) is in a compressed state;

the flexible shaft poking sheet (28) is fixedly connected to the periphery of the sleeve (19); the operating handle (2) is connected with one end of the central shaft (17);

promote operating handle (2), gear plectrum (25) are to keeping away from or being close to the one side motion of ladder board (31) rotates operating handle (2), gear plectrum (25) are to keeping away from or being close to the motion of meso position groove.

3. A multi-range operating mechanism according to claim 2, wherein said coupling member is a fourth bolt assembly (27), said sleeve (19) is provided with an oblong hole, said central shaft (17) is provided with a through hole, and said fourth bolt assembly extends through said oblong hole and said through hole to couple said range finger (25) to said sleeve (19).

4. A multi-gear operating mechanism according to claim 2, wherein one of the connecting blocks (23) is axially positioned with the sleeve (19) by means of a circlip (20).

5. Multiple gear operating mechanism according to claim 2, characterized in that the central shaft (17) is concentrically mounted in a sleeve (19) by means of first nylon sleeves (18) at both ends;

the gear shifting piece (25) is concentrically arranged outside the sleeve (19) through a second nylon sleeve (26).

6. The multi-gear operating mechanism according to claim 2, wherein the operating handle (2) comprises a handle (10), a connecting rod (12) and a connecting seat (14), the handle (10) is connected to the top end of the connecting rod (12), the connecting rod (12) is provided with a U-shaped mounting groove at the tail end, one end of the connecting seat (14) is connected with the connecting rod (12), the other end of the connecting seat is connected with the periphery of a sleeve (19), and the U-shaped mounting groove is connected with the central shaft (17).

7. The multi-gear operating mechanism according to claim 2, wherein the flexible shaft support (4) comprises a support plate (40) fixed on the bottom surface of the operating platform (1), an arc-shaped groove is formed in the support plate (40), and the arc-shaped groove and the center of the arc-shaped groove are in the same straight line with the center of the holes in the connecting blocks (23);

and limiting screws (29) used for limiting the swing range of the flexible shaft shifting piece (28) are arranged on two sides of the arc-shaped groove.

8. The multi-gear operating mechanism according to claim 1, wherein the flexible shaft poking piece (28) is connected with the plunger pump through a flexible shaft assembly (5);

the flexible shaft assembly (5) comprises a rope (32), a sheath (33) and a fixing seat (34), the fixing seat (34) is fixed on the flexible shaft support (4), the rope (32) can be connected in the sheath (33) in a shifting mode, one end of the rope (32) is connected with a flexible shaft shifting piece (28) through a connecting fork (35), and the other end of the rope is connected with a flow shifting fork of the plunger pump through a joint bearing (36).

9. A multi-gear operating mechanism according to any of claims 1 to 8, characterized in that one or both ends of the transmission shaft (3) are provided with an operating handle (2).

10. A lightweight road roller comprising a multi-range operating mechanism as claimed in any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of road rollers, in particular to a multi-gear operating mechanism and a light road roller.

Background

The full hydraulic road roller realizes the stepless adjustment of the walking speed by changing the flow of the plunger pump, and the technical route is that an operating handle is used for controlling the stretching of a flexible shaft rope, the flexible shaft rope is connected to a flow crank arm on the plunger pump, and the swing angle of the flow crank arm is in direct proportion to the walking speed of equipment. The construction working speed of the road roller is generally 3-5 km/h, higher speed is needed when the road roller is automatically transferred to a field, and the middle-large tonnage road roller generally adopts a plunger pump matched with a variable motor to realize multi-gear speed control; for a light road roller, the number of selectable elements of a variable motor is small, the cost is high, a plunger pump is generally adopted to match a quantitative motor, so that the speed of the road roller can only be adjusted steplessly between the minimum speed and the maximum speed, a middle speed required by construction is not provided with a limiting device, the speed of the road roller is controlled completely by the manipulation experience of a driver, the construction work requirement is not facilitated, and meanwhile, the potential safety hazard that the speed of the road roller is suddenly accelerated too fast due to misoperation of a handle exists.

Disclosure of Invention

The invention aims to provide a multi-gear control mechanism and a light road roller, and aims to solve the problems that in the prior art, a plunger pump is adopted to match a quantitative motor, so that the speed of a vehicle can be only regulated steplessly between the minimum speed and the maximum speed, the requirement of construction work is not facilitated, and meanwhile, the potential safety hazard that the speed of the vehicle is changed suddenly due to misoperation of a handle exists.

In order to achieve the purpose, the invention is realized by adopting the following technical scheme:

a multi-gear control mechanism comprises a control platform, a transmission shaft connected below the control platform, a flexible shaft bracket and an operating handle connected to the end part of the transmission shaft;

the transmission shaft is provided with a gear shifting piece and a flexible shaft shifting piece for controlling the flow of the plunger pump;

the flexible shaft support is connected with a stepped plate, a middle-position groove is formed in the stepped plate, a first-stage step and a second-stage step are arranged on two sides of the middle-position groove, and the first-stage step is located between the second-stage step and the middle-position groove;

the operating handle enables the gear shifting piece to be located in a middle groove or a first-stage step or a second-stage step through a transmission shaft, when the gear shifting piece is located at the middle groove, the flexible shaft shifting piece enables the flow of the plunger pump to be zero, and when the gear shifting piece moves from the first-stage step to the second-stage step, the flexible shaft shifting piece enables the flow of the plunger pump to be gradually increased.

Further, the transmission shaft comprises a sleeve and at least two connecting blocks connected to the bottom surface of the operating platform, the sleeve is rotatably connected in holes of the connecting blocks, and a central shaft is sleeved in the sleeve;

the gear shifting piece is slidably connected to the periphery of the sleeve and fixedly connected with the central shaft through a connecting piece, and a spring is arranged between the gear shifting piece and one of the connecting blocks; when the gear shifting piece is positioned at the middle position groove, the spring is in a compressed state;

the flexible shaft shifting piece is fixedly connected to the periphery of the sleeve; the operating handle is connected with one end of the central shaft;

promote operating handle, the gear plectrum is to keeping away from or being close to the one side motion of ladder board rotates operating handle, the gear plectrum is to keeping away from or being close to the motion of meso position groove.

Furthermore, the connecting piece is a fourth bolt assembly, the sleeve is provided with a long round hole, the central shaft is provided with a through hole, and the fourth bolt assembly penetrates through the long round hole and the through hole to connect the gear shifting piece to the sleeve.

Further, one of the connecting blocks is axially positioned with the sleeve by a snap spring.

Further, the central shaft is concentrically arranged in the sleeve through first nylon sleeves at two ends;

the gear shifting piece is concentrically arranged outside the sleeve through a second nylon sleeve.

Further, operating handle includes handle, connecting rod and connecting seat, the handle is connected the top of connecting rod, the end of connecting rod is equipped with U type mounting groove, the one end of connecting seat with the connecting rod is connected, and the other end is connected with sheathed tube periphery mutually, U type mounting groove with the center pin is connected.

Furthermore, the flexible shaft support comprises a support plate fixed on the bottom surface of the control platform, an arc-shaped groove is formed in the support plate, and the arc-shaped groove and the centers of the holes in the plurality of connecting blocks are on the same straight line;

and limiting screws for limiting the swing range of the flexible shaft shifting piece are arranged on two sides of the arc-shaped groove.

Furthermore, the flexible shaft poking sheet is connected with the plunger pump through a flexible shaft assembly;

the flexible shaft assembly comprises a rope, a sheath and a fixed seat, the fixed seat is fixed on the flexible shaft support, the rope can be connected in the sheath in a shifting mode, one end of the rope is connected with the flexible shaft shifting piece through a connecting fork, and the other end of the rope is connected with the flow shifting fork of the plunger pump through a joint bearing.

Furthermore, one end or two ends of the transmission shaft are provided with operating handles.

The invention also discloses a light road roller which comprises the multi-gear control mechanism.

According to the technical scheme, the embodiment of the invention at least has the following effects:

1. the middle position groove, the first-stage step and the second-stage step are designed on the stepped plate, when the automatic transmission is used, the gear shifting piece is controlled to be located in the middle position groove, the first-stage step or the second-stage step through the operating handle, so that the flow of a plunger pump is conveniently controlled, the vehicle speed is conveniently controlled, and the vehicle speed is conveniently controlled to be at a middle speed through the arrangement of the middle position groove, the first-stage step and the second-stage step; when the gear shifting piece is positioned at the middle groove, the limiting of the operating handle can be realized, the sudden increase of the vehicle speed caused by the misoperation of the handle is prevented, and the possibility of safety accidents is avoided;

2. according to the design, when the gear shifting piece is positioned in the middle position groove, the spring is in a compressed state, namely, the spring is in a compressed state no matter the gear shifting piece is positioned at the middle position groove, the first-stage step or the second-stage step, when the operating handle is in a free state due to the adoption of the double design, the spring compresses the pretightening force to enable the gear shifting piece to be in pressure contact with the step plate, and the operating handle can be self-locked at any position under the action of friction force of the two, so that the stepless adjustment is realized, and the vehicle speed is stabilized;

3. when the gear shifting piece is positioned in the groove in the middle of the stepped plate, the stroke of the flexible shaft assembly is in a neutral position state, the displacement of the plunger pump is zero, the equipment is in a service braking state, and due to the limiting effect of the stepped plate groove, the operating handle is limited at the moment, so that the danger caused by mistaken touch of the operating handle in the service braking state is ensured;

4. when the device needs to walk, the operating handle is slightly shifted to one side of the spring, the gear shifting piece is separated from the middle groove limit of the stepped plate, the operating handle is pushed forwards (backwards), the gear shifting piece is positioned on a first-stage step of the stepped plate, and the length of the first-stage step is only half of the stroke of the flexible shaft assembly, so that the low-speed gear speed control is realized;

5. the stress of the operating handle towards one side of the spring is increased, the gear shifting fork rises from the first step to the second step of the stepped plate, and at the moment, the operating handle can be continuously pushed forwards (backwards), so that the control of higher vehicle speed is realized;

6. when the speed needs to be reduced, the operating handle is directly pulled back, and the gear shifting piece can automatically bounce back to the first-stage step from the second-stage step under the action of the pre-tightening force of the spring when reaching the position of the first-stage step, so that the hand feeling is clear, and the gears are clear;

7. when the automobile is required to be parked, the operating handle is continuously pulled back, and the gear shifting piece can automatically rebound to the middle groove from the first step when reaching the middle position of the stepped plate under the action of the pre-tightening force of the spring, so that the automobile can be braked.

Drawings

FIG. 1 is a schematic structural diagram of a manipulation platform according to an embodiment of the present invention;

FIG. 2 is a schematic view of the operating handle according to the embodiment of the present invention;

FIG. 3 is a schematic structural view of the connecting rod of FIG. 2;

FIG. 4 is a schematic structural view of the fixing base shown in FIG. 2;

FIG. 5 is a schematic structural view of a propeller shaft according to an embodiment of the present invention;

FIG. 6 is a schematic view of the structure of the central shaft of FIG. 5;

FIG. 7 is a schematic structural view of the bushing of FIG. 5;

FIG. 8 is a schematic structural view of the shift finger of FIG. 5;

FIG. 9 is a schematic structural diagram of a flexible shaft support according to an embodiment of the present invention;

FIG. 10 is a schematic view of the step plate of FIG. 9;

FIG. 11 is a schematic structural view of a flexible shaft assembly according to an embodiment of the present invention;

FIG. 12 is a schematic overall structure diagram of an embodiment of the present invention;

FIG. 13 is a detailed schematic view of FIG. 12;

fig. 14 is a schematic view of the installation structure of the present invention.

Wherein: 1. a manipulation platform; 2. an operating handle; 3. a drive shaft; 4. a flexible shaft bracket; 5. a flexible shaft assembly; 6. a seat fixing hole; 7. a transmission shaft fixing hole; 8. a flexible shaft bracket fixing hole; 9. a manipulation platform fixing hole; 10. a handle; 11. a pin; 12. a connecting rod; 13. a first bolt assembly; 14. a connecting seat; 15. a second bolt assembly; 16. a screw; 17. a central shaft; 18. a first nylon sleeve; 19. a sleeve; 20. a clamp spring; 21. a gasket; 22. a third bolt assembly; 23. connecting blocks; 24. a spring; 25. a gear shifting sheet; 26. a second nylon sleeve; 27. a fourth bolt assembly; 28. a flexible shaft plectrum; 29. a limit screw; 30. a fifth bolt assembly; 31. a step plate; 32. a rope; 33. a sheath; 34. a fixed seat; 35. a connecting fork; 36. a knuckle bearing; 37. a seat; 38. a road roller body; 39. a left operating handle; 40. a support plate.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

It should be noted that in the description of the present invention, the terms "front", "rear", "left", "right", "upper", "lower", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention but do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. As used in the description of the present invention, the terms "front," "back," "left," "right," "up," "down" and "in" refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.

The invention aims to solve the problems of compaction work vehicle speed control and misoperation potential safety hazard in the prior art of light road rollers, and simultaneously enhance the operation hand feeling of a driver and improve the operation comfort.

As shown in fig. 1 to 14, a multi-gear operating mechanism comprises an operating platform 1, a transmission shaft 3 connected below the operating platform 1, a flexible shaft bracket 4 and an operating handle 2 connected to the end of the transmission shaft 3; a gear shifting piece 25 and a flexible shaft shifting piece 28 for controlling the flow of the plunger pump are arranged on the transmission shaft 3; the flexible shaft support 4 is connected with a step plate 31, a middle groove is arranged on the step plate 31, a first-stage step and a second-stage step are arranged on two sides of the middle groove, and the first-stage step is positioned between the second-stage step and the middle groove; the operating handle 2 enables the gear shifting piece 25 to be located in the middle position groove or the first-stage step or the second-stage step through the transmission shaft 3, when the gear shifting piece 25 is located at the middle position groove, the flexible shaft shifting piece 28 enables the flow of the plunger pump to be zero, and when the gear shifting piece 25 moves from the first-stage step to the second-stage step, the flexible shaft shifting piece 28 enables the flow of the plunger pump to be gradually increased.

The middle position groove, the first-stage step and the second-stage step are designed on the stepped plate, when the automatic transmission is used, the gear shifting piece is controlled to be located in the middle position groove, the first-stage step or the second-stage step through the operating handle, so that the flow of a plunger pump is conveniently controlled, the vehicle speed is conveniently controlled, and the vehicle speed is conveniently controlled to be at a middle speed through the arrangement of the middle position groove, the first-stage step and the second-stage step; when the gear shifting piece is positioned at the middle groove, the limiting of the operating handle can be realized, the sudden increase of the vehicle speed caused by the misoperation of the handle is prevented, and the possibility of safety accidents is avoided.

The control platform 1 of the application is used for connecting a transmission shaft 3, a flexible shaft support 4 and the like. In some embodiments, the operation platform 1 is shown in fig. 1, the operation platform 1 is formed by bending a steel plate material, and a seat fixing hole 6, a transmission shaft fixing hole 7, a flexible shaft bracket fixing hole 8 and an operation platform fixing hole 9 are formed in the upper plane of the operation platform 1, and are respectively used for fixing the transmission shaft 3, the flexible shaft bracket 4, the seat 37 and the operation platform itself to the road roller body 38.

Specifically, the operating handle 2 is shown in fig. 2 and comprises a handle 10, a pin 11, a connecting rod 12, a first bolt assembly 13, a connecting seat 14, a second bolt assembly 15 and a screw 16, wherein a pin hole is formed in the upper part of the connecting rod 12, a U-shaped mounting groove is formed in the lower part of the connecting rod 12, and as shown in fig. 4, the handle 10 is fixed to the upper part of the connecting rod 12 through the pin 11; the connecting holder 14 is rotatably mounted to a middle lower portion of the connecting rod 12 by a second bolt assembly 15.

The transmission shaft 3 is shown in fig. 5 and comprises a central shaft 17, a first nylon sleeve 18, a sleeve 19, a clamp spring 20, a gasket 21, a third bolt assembly 22, a connecting block 23, a spring 24, a gear shifting piece 25, a second nylon sleeve 26 and a fourth bolt assembly 27.

The sleeve 19 is arranged in the hole sites of the two connecting blocks 23, the two connecting blocks are in clearance fit, the sleeve 19 can freely rotate in the hole sites of the two connecting blocks 23, and one connecting block 23 is axially positioned with the sleeve 19 through the clamp spring 20. The sleeve 19 is provided with a long round hole and welded with a flexible shaft poking sheet 28, as shown in fig. 7.

The central shaft 17 is concentrically arranged inside the sleeve 19 through first nylon sleeves 18 at two ends, the outer ring of each first nylon sleeve 18 is matched with the inner wall of the sleeve 19, and the inner ring of each first nylon sleeve 18 is matched with the outer ring of the central shaft 17, so that the central shaft 17 and the sleeve 19 can concentrically rotate relatively; the gear shifting piece 25 is concentrically arranged outside the sleeve 19 through a second nylon sleeve 26, the outer ring of the second nylon sleeve 26 is matched with the inner wall of the gear shifting piece 25, and the inner ring of the second nylon sleeve 26 is matched with the excircle of the sleeve 19 so as to ensure that the gear shifting piece 25 can axially slide along the excircle of the sleeve 19; the fourth bolt assembly 27 sequentially penetrates through a through hole in the gear shifting piece 25, a through hole in the central shaft 17 and a long round hole in the sleeve 19 to fix the gear shifting piece 25;

the spring 24 is sleeved outside the sleeve 19 and is arranged between the axially positioned connecting block 23 and the gear shifting piece 25, the two ends of the spring are respectively provided with a gasket 21, and the spring 24 is in an axial compression state after being installed.

The third bolt assembly 22 fixedly mounts the driving shaft 3 at the lower portion of the manipulation platform 1 through the driving shaft fixing hole 7.

The flexible shaft bracket 4 is shown in fig. 9 and comprises a limit screw 29, a fifth bolt assembly 30, a step plate 31 and a bracket plate 40. The stepped plate 31 has a stepped symmetrical structure, see fig. 10; the fifth bolt assembly 30 fixes the flexible shaft bracket 4 below the control platform 1 through the flexible shaft bracket fixing hole 8.

The shape of the tail end of the gear shifting piece 25 is matched with the middle groove of the stepped plate 31, and the gear shifting piece and the middle groove are in mutual pressing contact under the action of the pretightening force of the spring 24.

The flexible shaft assembly 5 is shown in fig. 11 and comprises a rope 32, a sheath 33, a fixed seat 34, a connecting fork 35 and a joint bearing 36, wherein the rope 32 can freely move in the sheath 33, the connecting fork 35 is fixed in a through hole of the flexible shaft shifting piece 28, the joint bearing 36 is used for connecting a flow shifting fork of the plunger pump, and the fixed seat 34 fixes the flexible shaft assembly 5 on the flexible shaft support 4 through a flexible shaft support fixing hole on the flexible shaft support 4, which is shown in fig. 13.

The lower opening structure of the connecting rod 12 is rotatably connected with the right end of a central shaft 17 of the transmission shaft 3, the connecting seat 14 is sleeved outside the sleeve 19 and is clamped and fixed through a screw 16, and therefore the operating handle 2 is arranged at the right end of the transmission shaft 3; the limit screws 29 are distributed on two sides of the gear shifting piece 25 and used for controlling the push-pull stroke of the rope 32 in the flexible shaft assembly 5, as shown in fig. 13.

According to the installation method, the operating handle 2 is pushed to one side of the spring 24 by force, the central shaft 17 overcomes the pre-tightening force of the spring 24 and moves to one side far away from the spring 24, so that the gear shifting piece 25 is separated from the step position of the step plate 31, then the operating handle 2 is pushed around the central shaft 17, the rope 32 in the flexible shaft assembly 5 can be extended or shortened, and further the flow rate of the plunger pump can be controlled.

When the operating handle 2 is in a free state, the spring 24 compresses the pretightening force to enable the gear shifting piece 25 to be in pressure contact with the step plate, and the friction force of the gear shifting piece and the step plate enables the operating handle 2 to be self-locked at any position, so that stepless adjustment is realized, and the vehicle speed is stabilized;

when the gear shifting piece 25 is positioned in the groove in the middle of the stepped plate 31, the stroke of the flexible shaft assembly 5 is in a middle position state, the displacement of the plunger pump is zero, the equipment is in a service braking state, and due to the limiting effect of the middle position groove in the stepped plate 31, the operating handle 2 is limited, so that the danger caused by mistaken touch of the operating handle in the service braking state is ensured;

when the equipment needs to walk, slightly stir operating handle to spring 24 one side, the gear plectrum breaks away from the middle recess spacing of notch ladder 31, and forward (backward) promote operating handle 2, and gear plectrum 25 is located the one-level step of notch ladder 31, and one-level step length only has half of flexible axle assembly stroke, realizes low-speed gear speed control from this.

When the force of the operating handle to one side of the spring 24 is increased, the gear shifting piece 25 rises from the first step to the second step of the stepped plate 31, and at the moment, the operating handle 2 can be continuously pushed forwards (backwards), so that the control of higher vehicle speed is realized.

When the speed needs to be reduced, the operating handle 2 is directly pulled back, and under the action of the pre-tightening force of the spring 24, when the gear shifting piece 25 reaches the position of the first-stage step, the gear shifting piece can be automatically rebounded to the first-stage step by the second-stage step, so that the hand feeling is clear, and the gears are clear.

When the vehicle needs to be parked, the operating handle 2 is continuously pulled back, and the gear shifting piece 25 is automatically bounced back to the middle groove from the first step when reaching the middle position of the step plate 31 under the action of the pre-tightening force of the spring 24, so that the service brake is realized.

The application also provides a light road roller which comprises the control mechanism provided by the invention. Fig. 14 is a schematic view of an application of the invention, in which the operating mechanism of the invention is mounted integrally below the seat 37 and fixed to the body 38 of the roller; a left operating handle 39 can be arranged according to requirements and is arranged at the left end of the central shaft 17, so that a driver who is accustomed to left-handed operation can use the left operating handle conveniently.

It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.