Stepless speed change handle for tractor

Abstract

The utility model provides a stepless speed change handle for a tractor, and belongs to the technical field of tractors. The stepless speed change handle for the tractor comprises a base, a stop lever and a handle body, the lower end of the stop lever is hinged to the base, the handle body is fixedly connected with the upper end of the stop lever, a damping mechanism is arranged on the base and connected with the stop lever in a damping mode, and the handle body is elastically connected with a button. The button is provided with a transmission mechanism which is linked with the damping mechanism, and the base is further provided with an induction mechanism which induces the deflection angle of the stop lever. The gear shifting mechanism has the advantages that the transmission mechanism transmits stepless button actions to the damping mechanism, so that damping is reduced, and gear shifting is achieved; the sensing mechanism is used for sensing the change of the stop lever, so that a corresponding gear signal is released, and stepless speed change is realized; and after the button is released, the damping mechanism achieves maximum damping, gear locking is achieved, operation is easy and convenient, and the device is suitable for different users.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of tractor technology, in particular, relates to a tractor stepless speed change handle. BACKGROUND

[0002] The tractor stepless speed change handle is used for controlling the running speed of the tractor, and the handle is usually provided with certain damping to ensure the hand feeling, and a locking device is further provided to ensure that the handle can be locked in the current gear. The handle damping is usually not adjustable, which is not convenient for adapting to the operation habits of different user groups. CONTENT OF THE UTILITY MODEL

[0003] In order to make up for the above shortcomings, the present application provides a tractor stepless speed change handle, which aims to improve the problems mentioned in the above background technology.

[0004] The present application provides a tractor stepless speed change handle, which comprises a base, a stop lever and a handle, the lower end of the stop lever is hingedly connected with the base, the handle is fixedly connected with the upper end of the stop lever, a damping mechanism is arranged on the base and is dampingly connected with the stop lever, a button is elastically connected with the handle, a transmission mechanism is arranged on the button and is linked with the damping mechanism, and a sensing mechanism is further arranged on the base to sense the deflection angle of the stop lever.

[0005] In a specific embodiment, the lower end of the stop lever is fixedly connected with a rotating shaft, and a bearing is arranged between the rotating shaft and the base.

[0006] In the above implementation process, the rotating shaft is used to ensure the stable deflection of the handle and the stop lever.

[0007] In a specific embodiment, the sensing mechanism comprises a code disc and a sensor, the code disc is fixedly connected with one end of the rotating shaft, and the sensor is installed on the base, and the sensing head of the sensor is aligned with the code disc.

[0008] In the above implementation process, a magnet is arranged on the code disc, and the sensor adopts a Hall element, which is used to sense the rotation of the code disc, and then obtain the data of the deflection angle of the handle, so as to release the corresponding gear signal, and then control the gear shifting of the tractor.

[0009] In a specific embodiment, the damping mechanism comprises a static friction plate and a dynamic friction plate, the static friction plate is axially slidingly connected with the inner wall of the base, the dynamic friction plate is fixedly connected with the rotating shaft in the circumferential direction, and the dynamic friction plate is frictionally connected with the static friction plate.

[0010] In the implementation process, the sliding friction is generated by the friction between the dynamic friction plate and the static friction plate, the current gear is locked when the static friction is generated, and the outer circle of the static friction plate is provided with a convex rib to be clamped in the axial sliding groove in the inner wall of the base to achieve the effect of circumferential fixing and axial sliding.

[0011] In a specific embodiment, the damping mechanism further comprises a disc spring located between the base and the static friction plate.

[0012] In the implementation process, the disc spring is used to abut the static friction plate against the dynamic friction plate, the elastic force of the disc spring changes when the position of the dynamic friction plate supported by the transmission mechanism changes, the sliding friction changes, and then the damping changes.

[0013] In a specific embodiment, the transmission mechanism comprises a hydraulic cylinder, the cylinder body of the hydraulic cylinder is hinged in the inner wall of the handle, the telescopic end of the hydraulic cylinder is hinged with the button, and an oil pipe is arranged on the hydraulic cylinder.

[0014] In the implementation process, the oil pipe is connected to one side close to the telescopic end, when the button is pressed, the inner cavity of the hydraulic cylinder is increased, and the oil is sucked into the hydraulic cylinder through the oil pipe, so as to adjust the supporting force of the dynamic friction plate.

[0015] In a specific embodiment, the transmission mechanism further comprises a hydraulic seat fixedly connected with the rotating shaft, and the hydraulic seat is circumferentially arranged with pistons, all the pistons are fixedly connected with the dynamic friction plate, an annular groove is arranged in the hydraulic seat and is communicated with all the piston cavities, and the annular groove is communicated with the oil pipe.

[0016] In the implementation process, when the oil enters the hydraulic cylinder through the oil pipe, the oil in the hydraulic seat is reduced, all the pistons move backward, the dynamic friction plate moves backward, the disc spring is stretched, the abutting force between the dynamic friction plate and the static friction plate is reduced, and then the damping is reduced.

[0017] In a specific embodiment, the button is provided with a spring.

[0018] In the implementation process, the button is kept in a pop-up state by the spring, and then the oil in the hydraulic cylinder is kept in a compressed state.

[0019] Compared with the prior art, the beneficial effects of the application are that the transmission mechanism transmits the stepless button action to the damping mechanism, and then reduces the damping to realize gear shifting; the sensing mechanism is used to sense the change of the gear lever, and then release the corresponding gear signal to realize stepless speed change; the damping mechanism realizes maximum damping after the button is released, and the gear is locked, which is simple to operate and suitable for different user groups. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative effort.

[0021] Figure 1 is a schematic diagram of a stepless speed change handle for a tractor provided by the embodiments of the present application;

[0022] Figure 2 is a schematic diagram of the connection relationship between a button and a handle provided by the embodiments of the present application;

[0023] Figure 3 is a schematic diagram of the connection relationship between a damping mechanism and a rotating shaft provided by the embodiments of the present application;

[0024] Figure 4 is an exploded schematic diagram of the connection relationship between a damping mechanism and a hydraulic seat provided by the embodiments of the present application.

[0025] In the figure: 10 - base; 20 - stop lever; 21 - rotating shaft; 22 - bearing; 30 - handle; 40 - button; 50 - damping mechanism; 51 - static friction plate; 52 - dynamic friction plate; 53 - disc spring; 60 - transmission mechanism; 61 - hydraulic cylinder; 62 - oil pipe; 63 - hydraulic seat; 64 - piston; 70 - sensing mechanism; 71 - code disc; 72 - sensor. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings in the embodiments of the present application.

[0027] Please refer to Figures 1-4 The present application provides a stepless speed change handle for a tractor, which comprises a base 10, a stop lever 20 and a handle 30. The lower end of the stop lever 20 is hingedly connected to the base 10, and the handle 30 is fixedly connected to the upper end of the stop lever 20. The base 10 is provided with a damping mechanism 50 which is dampingly connected to the stop lever 20. The handle 30 is elastically connected with a button 40. The button 40 is provided with a transmission mechanism 60 which is linked with the damping mechanism 50. The base 10 is further provided with a sensing mechanism 70 which senses the deflection angle of the stop lever 20. Among them, the transmission mechanism 60 transmits the stepless action of the button 40 to the damping mechanism 50, thereby reducing the damping to realize gear shifting; the sensing mechanism 70 is used to sense the change of the stop lever 20, thereby releasing the corresponding gear signal to realize stepless speed change; after the button 40 is released, the damping mechanism 50 realizes maximum damping to realize the locking of the gear, which is simple to operate and suitable for different user groups.

[0028] Please refer to Figures 1-4The lower end of the stop lever 20 is fixedly connected with a rotating shaft 21, and a bearing 22 is arranged between the rotating shaft 21 and the base 10. The rotating shaft 21 is used to ensure the stable deflection of the handle 30 and the stop lever 20.

[0029] Please refer to Figures 1-4 The sensing mechanism 70 comprises a code disc 71 and a sensor 72. The code disc 71 is fixedly connected with one end of the rotating shaft 21, and the sensor 72 is installed on the base 10. The sensing head of the sensor 72 is aligned with the code disc 71. The code disc 71 is provided with a magnet, and the sensor 72 adopts a Hall element, which is used to sense the rotation of the code disc 71, so as to obtain the data of the deflection angle of the handle 30, thereby releasing the corresponding gear signal, and further controlling the gear shifting of the tractor.

[0030] Please refer to Figures 1-4 The damping mechanism 50 comprises a static friction sheet 51 and a dynamic friction sheet 52. The static friction sheet 51 is axially slidably connected with the inner wall of the base 10, and the dynamic friction sheet 52 is circumferentially fixedly connected with the rotating shaft 21. The dynamic friction sheet 52 is frictionally connected with the static friction sheet 51. Through the friction between the dynamic friction sheet 52 and the static friction sheet 51, the gear shifting damping is provided when sliding, and the current gear is locked when static friction is generated. The outer circle of the static friction sheet 51 is provided with a convex rib to be clamped in the axial sliding groove in the inner wall of the base 10, so as to realize the effect of circumferential fixation and axial sliding.

[0031] Please refer to Figures 1-4 The damping mechanism 50 further comprises a disc spring 53, which is located between the base 10 and the static friction sheet 51. The disc spring 53 is used to abut the static friction sheet 51 against the dynamic friction sheet 52. When the position of the dynamic friction sheet 52 supported by the transmission mechanism 60 changes, the elastic force of the disc spring 53 will change, thereby changing the sliding friction force and further changing the damping.

[0032] Please refer to Figures 1-4 The transmission mechanism 60 comprises a hydraulic cylinder 61, the cylinder body of which is hinged to the inner wall of the handle 30, and the telescopic end of the hydraulic cylinder 61 is hinged to the button 40. The hydraulic cylinder 61 is provided with an oil pipe 62. The oil pipe 62 is connected to one side close to the telescopic end. When the button 40 is pressed, the inner cavity of the hydraulic cylinder 61 is increased, and the oil is sucked into the hydraulic cylinder 61 through the oil pipe 62, thereby adjusting the supporting force of the dynamic friction sheet 52.

[0033] Please refer to Figures 1-4The transmission mechanism 60 further comprises a hydraulic seat 63 fixedly connected with the rotating shaft 21, and a plurality of pistons 64 are arranged in the circumferential direction on the hydraulic seat 63, all of the pistons 64 are fixedly connected with the movable friction plate 52, and an annular groove is formed in the hydraulic seat 63 and communicates with the cavities of all of the pistons 64, and the annular groove communicates with the oil pipe 62. When the oil enters into the hydraulic cylinder 61 through the oil pipe 62, the oil in the hydraulic seat 63 is reduced, all of the pistons 64 move backward, the movable friction plate 52 is driven to move backward, the disc spring 53 is stretched, the pressing force between the movable friction plate 52 and the static friction plate 51 is reduced, and then the damping is reduced.

[0034] Please refer to Figures 1-4 The spring is arranged in the button 40. The button 40 is kept in the pop-up state by the spring, and then the oil in the hydraulic cylinder 61 is kept in the compressed state. In the embodiment, the button 40 is sleeved with a rubber sleeve, and the rubber sleeve is fixedly connected with the handle 30, so that the sealing of the button 40 is realized.

[0035] The working principle of the stepless speed change handle for the tractor is as follows: the button 40 is kept in the pop-up state by the spring, and then the oil in the hydraulic cylinder 61 is kept in the compressed state. The oil is compressed into the hydraulic seat 63, all of the pistons 64 are pushed out, the pressing force of the movable friction plate 52 against the static friction plate 51 reaches the maximum, and the locking of the current gear is realized. When the gear needs to be changed, the button 40 is pressed according to the personal habit with appropriate force. The button 40 drives the hydraulic cylinder 61 to act. The inner cavity of the hydraulic cylinder 61 is increased, the oil in the hydraulic seat 63 is sucked into the hydraulic cylinder 61 through the oil pipe 62, the oil in the hydraulic seat 63 is reduced, all of the pistons 64 move backward, the movable friction plate 52 is driven to move backward, the disc spring 53 is stretched, the pressing force between the movable friction plate 52 and the static friction plate 51 is reduced, and then the damping is reduced. When the shift lever 20 is deflected, the code disc 71 is deflected. The magnet is arranged on the code disc 71, the sensor 72 adopts a Hall element, is used for sensing the rotation of the code disc 71, and then the data of the deflection angle of the handle 30 is obtained, so that the corresponding gear signal is released, and then the gear change of the tractor is controlled. In summary, the transmission mechanism 60 transmits the stepless action of the button 40 to the damping mechanism 50, and then the damping is reduced to realize the gear change. The sensing mechanism 70 is used for sensing the change of the shift lever 20, and then the corresponding gear signal is released, and the stepless speed change is realized. After the button 40 is released, the damping mechanism 50 realizes the maximum damping, the locking of the gear is realized, the operation is simple, and it is suitable for different user groups.

[0036] The above merely provides examples of the present application, and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application can have various modifications and changes. Any modified, improved or equivalent replacement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

Claims

1. A continuously variable transmission handle for a tractor, characterized in that The utility model provides a damping mechanism, a transmission mechanism and an induction mechanism are arranged on the base (10), the damping mechanism is connected with the blocking rod (20) and the transmission mechanism is connected with the button (40), the induction mechanism is used for sensing the deflection angle of the blocking rod (20).

2. A handle for a continuously variable transmission of a tractor according to claim 1, characterized in that The lower end of the blocking rod (20) is fixedly connected with a rotating shaft (21), and a bearing (22) is arranged between the rotating shaft (21) and the base (10).

3. A variable speed handle for a tractor as claimed in claim 2, wherein, The induction mechanism (70) comprises a code disc (71) and a sensor (72), one end of the code disc (71) is fixedly connected with the rotating shaft (21), and the sensor (72) is installed on the base (10); the induction head of the sensor (72) is aligned with the code disc (71).

4. A variable speed handle for a tractor as claimed in claim 3, wherein, The damping mechanism (50) comprises a static friction sheet (51) and a dynamic friction sheet (52), the static friction sheet (51) is axially slidably connected with the inner wall of the base (10), the dynamic friction sheet (52) is fixedly connected with the rotating shaft (21) in the circumferential direction, and the dynamic friction sheet (52) is frictionally connected with the static friction sheet (51).

5. A variable speed handle for a tractor as claimed in claim 4, wherein, The damping mechanism (50) further comprises a disc spring (53), and the disc spring (53) is located between the base (10) and the static friction sheet (51).

6. A variable speed handle for a tractor as claimed in claim 5, wherein, The transmission mechanism (60) comprises a hydraulic cylinder (61), the cylinder body of the hydraulic cylinder (61) is hingedly connected to the inner wall of the handle (30), the telescopic end of the hydraulic cylinder (61) is hingedly connected with the button (40), and an oil pipe (62) is arranged on the hydraulic cylinder (61).

7. A variable speed handle for a tractor as claimed in claim 6, wherein, The transmission mechanism (60) further comprises a hydraulic seat (63), the hydraulic seat (63) is fixedly connected with the rotating shaft (21), the hydraulic seat (63) is circumferentially provided with a plurality of pistons (64), all the pistons (64) are fixedly connected with the dynamic friction sheet (52), an annular groove is formed in the hydraulic seat (63) and communicates with the cavities of all the pistons (64), and the annular groove communicates with the oil pipe (62).

8. A variable speed handle for a tractor as claimed in claim 7, characterised in that, The button (40) is provided with a spring.

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