Linkage mechanism for stepless speed change control and engine safe starting of tractor

Abstract

The utility model discloses a tractor stepless speed change control and engine safe starting linkage mechanism which comprises a connecting machine frame and a hydrostatic stepless speed changer arranged in the connecting machine frame, the connecting machine frame is located in a tractor head, an advancing pedal and a buffering pull rod are arranged in the connecting machine frame, and the buffering pull rod is located in the connecting machine frame. A front limiting bolt is arranged at the lower end of the advancing pedal and installed on the outer side of the tractor head, and a safety starting switch is arranged in the connecting rack. According to the tractor stepless speed change control and engine safe starting linkage mechanism, the contact arc line of the HST control rocker arm and the bearing is designed, it is guaranteed that the distance between the bearing and the rotating axis of the HST control rocker arm is the shortest when the bearing is located at the neutral position, and when a control pedal is in an advancing or retreating state, the bearing is away from the axis of the HST control rocker arm; therefore, the neutral positioning rod is pulled to be away from the safety starting switch, the whole machine is in a non-starting protection state, and the starting safety of the whole machine is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tractors, in particular to a linkage mechanism for stepless speed change control of a tractor and safe starting of an engine. Background Art

[0002] During the production of tractors, the internal structure of the tractor needs to be assembled, and the engine, as an extremely important power mechanism, needs to be adapted and installed with the transmission;

[0003] However, the engine start of existing tractors still has certain usage defects. The existing engine start is only controlled by the ignition switch, which is easy to start by mistake during irregular operation; or the operator does not cut off the power and starts the engine under load. Moreover, if the ignition switch is not returned to the original position, the engine starter motor will be in a long-term working state, causing damage to the starter motor;

[0004] Patent application publication number CN211692685U discloses a tractor safety starting device. The tractor safety starting device has a safety starting compression spring sleeved on a contact limit rod, and a safety starting switch installed at one end of the contact limit rod through a start switch mounting ear. This device can prevent misoperation and protect personal safety; protect the engine from starting under load; protect the engine from damage when the ignition switch is not returned to its original position, thereby extending the engine's service life;

[0005] The above-mentioned patent disclosure solves the above-mentioned problems, but the tractor safety starting device still has the following problems: when the device is in use, the safety starting switch can be turned on by stepping on the clutch pedal, and the safety starting device can be operated at this time, which can easily cause the entire machine to be in a state of protection that cannot be started, thereby easily affecting the safety of the entire machine starting.

[0006] In response to the above problems, it is urgent to carry out innovative design based on the original linkage mechanism structure. Utility Model Content

[0007] The purpose of the utility model is to provide a linkage mechanism for stepless speed change control and engine safety start of a tractor, so as to solve the problem proposed in the above background technology that the safety start switch can be turned on by stepping on the clutch pedal, and the safety start device can be operated at this time, which easily causes the whole machine to be in a non-starting protection state, thereby easily affecting the safety of the whole machine starting.

[0008] To achieve the above-mentioned object, the present invention provides the following technical solution: a tractor continuously variable speed control and engine safety start linkage mechanism, comprising a connecting frame and a hydrostatic continuously variable transmission disposed inside the connecting frame, wherein the hydrostatic continuously variable transmission is used to change the output efficiency of the engine;

[0009] The connecting frame is located inside the tractor head, a forward pedal and a buffer pull rod are provided inside the connecting frame, a front limit bolt is provided at the lower end of the forward pedal, and the front limit bolt is installed on the outside of the tractor head, a bearing is provided inside the connecting frame, and a neutral positioning rod is mounted inside the bearing, and the neutral positioning rod is rotatably connected to the connecting frame through the bearing;

[0010] A safety start switch is provided inside the connecting frame, and a traction rod is provided inside the connecting frame. The tractor engine is safely started by controlling the neutral positioning rod to contact the safety start switch.

[0011] A rear limit bolt and a backward foot pedal are provided inside the connecting frame, a traction rod is provided inside the connecting frame, and the center of the traction rod and the center of the safety start switch are in the same straight line, a control rocker arm is provided inside the connecting frame, and a transmission square shaft is provided inside the connecting frame.

[0012] Preferably, the rear limiting bolt is located at the lower end of the rearward foot pedal, and the upper end surface of the rear limiting bolt is higher than the upper end surface of the front limiting bolt.

[0013] Preferably, the neutral positioning rod is located at the lower end of the return spring, and the neutral positioning rod and the backward pedal are located on the same side of the connection frame.

[0014] Preferably, a damping rod is provided inside the connecting frame, and the damping rod is located at the lower end of the backward foot pedal.

[0015] Preferably, the control rocker arm is located at the lower end of the return spring, and is located together with the control rocker arm on the side of the forward pedal close to the reverse foot pedal.

[0016] Preferably, the transmission square shaft is fixedly connected to the control rocker arm, and the transmission square shaft is away from the side of the control rocker arm close to the buffer rod.

[0017] Preferably, a neutral rocker arm is provided inside the connecting frame, and the neutral rocker arm is rotationally connected to the control rocker arm, and the upper end of the neutral rocker arm is engaged and connected with the return spring.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. The contact arc between the HST control rocker arm and the bearing is designed to ensure that the bearing is at the shortest distance from the HST control rocker arm's rotation axis when in the neutral position. When the pedal is operated, whether in forward or reverse position, the bearing is away from the HST control rocker arm's axis, thereby pulling the neutral positioning rod away from the safety start switch, putting the entire machine in a non-starting protection state, thereby improving the safety of the entire machine startup;

[0020] 2. The engine can be started safely only when the neutral position safety start switch contacts the neutral positioning rod, which has a safety and protective effect on the entire machine and personnel;

[0021] 3. Furthermore, the buffer pad in the buffer pull rod forms a buffering effect on the forward and reverse pedals, while the damping rod can reduce the impact force of the return spring and also increase the buffering of the pedals;

[0022] 4. Furthermore, foot control enables stepless speed change of the tractor, which is easy and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the front view structure of the utility model;

[0024] Figure 2 This is a schematic diagram of the top view of the structure of the utility model;

[0025] Figure 3 This is a schematic diagram of the three-dimensional structure of the return spring of the utility model;

[0026] Figure 4 This is a schematic diagram of the three-dimensional structure of the front limit bolt of the utility model;

[0027] Figure 5 This is a schematic diagram of the structure of the utility model in the backward state;

[0028] Figure 6 This is a schematic diagram of the structure of the utility model in the forward state;

[0029] Figure 7 This is a schematic diagram of the structure of the rocker arm and bearing motion state control of the utility model.

[0030] In the figure: 1. Connecting frame; 2. Hydrostatic continuously variable transmission; 3. Forward pedal; 4. Buffer pull rod; 5. Safety start switch; 6. Rear limit bolt; 7. Bearing; 8. Front limit bolt; 9. Drawbar; 10. Return spring; 11. Neutral positioning rod; 12. Damping rod; 13. Control rocker arm; 14. Transmission square shaft; 15. Reverse foot pedal; 16. Neutral position; 17. Neutral rocker arm. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] In a specific embodiment, Figure 1-Figure 7 As shown, the specific working process of the safety start linkage mechanism is disclosed;

[0033] Connecting the frame 1 and the hydrostatic continuously variable transmission 2 provided inside the frame 1, wherein the hydrostatic continuously variable transmission 2 is used to change the output efficiency of the engine;

[0034] The connecting frame 1 is located inside the tractor head. A forward pedal 3 and a buffer pull rod 4 are provided inside the connecting frame 1. A front limit bolt 8 is provided at the lower end of the forward pedal 3, and the front limit bolt 8 is installed on the outside of the tractor head. A bearing 7 is provided inside the connecting frame 1, and a neutral positioning rod 11 is installed inside the bearing 7. The neutral positioning rod 11 is rotatably connected to the connecting frame 1 through the bearing 7.

[0035] A safety start switch 5 is provided inside the connecting frame 1, and a traction rod 9 is provided inside the connecting frame 1. By controlling the neutral positioning rod 11 to contact the safety start switch 5, the tractor engine is safely started;

[0036] A rear limit bolt 6 and a backward foot pedal 15 are provided inside the connecting frame 1, a traction rod 9 is provided inside the connecting frame 1, and the center of the traction rod 9 and the center of the safety start switch 5 are in the same straight line, a control rocker arm 13 is provided inside the connecting frame 1, and a transmission square shaft 14 is provided inside the connecting frame 1;

[0037] The rear limit bolt 6 is located at the lower end of the rear foot pedal 15, and the upper end surface of the rear limit bolt 6 is higher than the upper end surface of the front limit bolt 8;

[0038] The neutral positioning rod 11 is located at the lower end of the return spring 10 , and the neutral positioning rod 11 and the backward pedal 15 are located on the same side of the connecting frame 1 .

[0039] When using the tractor's stepless speed control and engine safety start linkage mechanism;

[0040] Through the HST (Hydrostatic Continuously Variable Transmission) 2, the connection between the lower transmission square shaft 14 and the HST control rocker arm 13, the forward pedal 3 and the reverse pedal 15 are controlled by the foot;

[0041] When the HST forward pedal 3 or the reverse pedal 15 is stepped on, the rocker arm of the buffer pull rod 4 drives the HST control rocker arm 13 to rotate, and at the same time, the neutral rocker arm 17 is driven to rotate by rotating and squeezing the bearing 7 on the neutral rocker arm 17, thereby causing the return spring 10 to pull up or rebound.

[0042] The HST control stroke controls the starting position of the HST forward pedal 3 and the reverse pedal 15 by adjusting the front limit bolt 8 and the rear limit bolt 6, ultimately realizing the forward and reverse functions of the HST tractor;

[0043] When the HST control rocker arm 13 is in the neutral position 16, the safety start switch 5 contacts the neutral positioning rod 11, the output shaft of the HST is in the neutral position, and the safety start switch 5 triggers a signal to the whole machine starting device. Only then can the engine be safely started, ensuring the safety of tractor starting.

[0044] When the neutral positioning rod 11 is in the neutral position 16 and contacts the safety start switch 5, the engine can be safely started.

[0045] When the HST reverse pedal 15 is stepped on, the HST control rocker arm 13 is driven to rotate backward from the neutral position 16 through the buffer pull rod 4, and then the bearing 7 on the neutral rocker arm 17 is squeezed away by the edge of the HST control rocker arm 13, causing the neutral positioning rod 11 to move forward from the neutral position 16, that is, the neutral positioning rod 11 is separated from the safety start switch 5, the engine starting device is in the closed protection state, and the engine cannot be started.

[0046] When the HST forward pedal 3 is stepped on, the HST control rocker arm 13 is driven to rotate forward from the neutral position 16 through the buffer pull rod 4, and then the bearing 7 on the neutral rocker arm 17 is squeezed away by the edge of the HST control rocker arm 13, causing the neutral positioning rod 11 to move forward from the neutral position 16, that is, the neutral positioning rod 11 is separated from the safety start switch 5, the engine starting device is in the closed protection state, and the engine cannot be safely started.

[0047] A damping rod 12 is provided inside the connecting frame 1, and the damping rod 12 is located at the lower end of the backward foot pedal 15;

[0048] The control rocker arm 13 is located at the lower end of the return spring 10 and is located on the side of the forward pedal 3 close to the reverse foot pedal 15 together with the control rocker arm 13;

[0049] The transmission square shaft 14 is fixedly connected to the control rocker arm 13, and the transmission square shaft 14 is away from the side of the control rocker arm 13 close to the buffer rod 4;

[0050] A neutral rocker arm 17 is provided inside the connecting frame 1 , and the neutral rocker arm 17 is rotationally connected to the control rocker arm 13 , and the upper end of the neutral rocker arm 17 is engaged with the return spring 10 .

[0051] When the neutral position 16 safety start switch 5 contacts the neutral positioning rod 11, the engine can be safely started, which has a safety and protection effect on the entire machine and personnel.

[0052] The buffer pad in the buffer pull rod 4 forms a buffering effect on the forward pedal 3 and the backward foot pedal 15. At the same time, the damping rod 12 can reduce the impact force of the return spring 10 and also increase the buffering of the foot pedal.

[0053] Foot control enables stepless speed change of the tractor, which is easy and convenient.

[0054] Design the contact arc between the HST control rocker arm 13 and the bearing 7 to ensure that the distance between the bearing 7 and the rotation axis of the HST control rocker arm 13 is the shortest when the bearing 7 is in the neutral position 16;

[0055] When the operating pedal is in the forward or reverse state, the bearing 7 is away from the axis of the HST control rocker arm 13, thereby pulling the neutral positioning rod 11 away from the safety start switch 5, putting the entire machine in a non-start protection state, thereby improving the safety of the entire machine startup and increasing the overall practicality.

[0056] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0057] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tractor continuously variable speed control and engine safety start linkage mechanism, comprising a connecting frame (1) and a hydrostatic continuously variable transmission (2) disposed within the connecting frame (1), wherein the hydrostatic continuously variable transmission (2) is used to change the output efficiency of the engine; Its characteristics are: The invention also includes: the connecting frame (1) is located inside the tractor head; a forward pedal (3) and a buffer pull rod (4) are provided inside the connecting frame (1); a front limit bolt (8) is provided at the lower end of the forward pedal (3); and the front limit bolt (8) is installed on the outside of the tractor head; a bearing (7) is provided inside the connecting frame (1); a neutral positioning rod (11) is mounted in engagement with the inside of the bearing (7); and the neutral positioning rod (11) is rotatably connected to the connecting frame (1) through the bearing (7); A safety start switch (5) is provided inside the connecting frame (1), and a traction rod (9) is provided inside the connecting frame (1). By controlling the neutral positioning rod (11) to contact the safety start switch (5), the tractor engine is safely started.

2. The tractor continuously variable speed control and engine safety start linkage mechanism according to claim 1, characterized in that: A rear limit bolt (6) and a backward pedal (15) are provided inside the connecting frame (1), and the rear limit bolt (6) is located at the lower end of the backward pedal (15), and the upper end surface of the rear limit bolt (6) is higher than the upper end surface of the front limit bolt (8).

3. The tractor continuously variable speed control and engine safety start linkage mechanism according to claim 1, characterized in that: A return spring is provided inside the connecting frame (1), the neutral positioning rod (11) is located at the lower end of the return spring (10), and the neutral positioning rod (11) and the backward pedal (15) are located on the same side of the connecting frame (1).

4. The tractor continuously variable speed control and engine safety start linkage mechanism according to claim 1, characterized in that: A damping rod (12) is provided inside the connecting frame (1), and the damping rod (12) is located at the lower end of the backward pedal (15).

5. The tractor continuously variable speed control and engine safety start linkage mechanism according to claim 1, characterized in that: A control rocker arm (13) is provided inside the connecting frame (1), and the control rocker arm (13) is located at the lower end of the return spring (10), and is located on the side of the forward pedal (3) close to the backward foot pedal (15) together with the control rocker arm (13).

6. The tractor continuously variable speed control and engine safety start linkage mechanism according to claim 1, characterized in that: A transmission square shaft (14) is provided inside the connecting frame (1), and the transmission square shaft (14) is fixedly connected to the control rocker arm (13), and the transmission square shaft (14) is away from the control rocker arm (13) and close to the side of the buffer pull rod (4).

7. The tractor continuously variable speed control and engine safety start linkage mechanism according to claim 1, characterized in that: A neutral rocker arm (17) is provided inside the connecting frame (1), and the neutral rocker arm (17) is rotatably connected to the control rocker arm (13), and the upper end of the neutral rocker arm (17) is engaged and connected to the return spring (10).

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