Tractor parking brake mechanism

Abstract

The utility model relates to tractor braking system field discloses a tractor parking brake mechanism, including left and right interval's brake support, and the rotatory connection brake rotary axle between the support, and the axle one end is equipped with brake rocker and connects brake handle assembly. The support is equipped with the pull rod support, and the rocker pivot lateral wall has first, second rocker, and the first rocker is connected reset device and rocker pull rod, and the brake support on the support connects second rocker, and the brake rotary axle is equipped with linkage mechanism and is connected with rocker pull rod. The mechanism stable structure, reliable braking, and the stable support is provided to double brake support, and the reasonable fixation of brake rotary axle and brake pump avoids the loosening deformation when braking, and double brake transmission path can high -efficient transmission power, prevents the car from sliding, and reset device directly connects brake support, can accurate pull component reset, avoids the jam.

Description

Technical Field

[0001] This utility model relates to the field of tractor braking system technology, specifically a tractor parking brake mechanism. Background Technology

[0002] Tractors, as key equipment in agricultural production and engineering operations, are widely used in vast fields and construction sites. The parking brake is crucial for tractors, ensuring they remain stable and stationary when parked, preventing slippage on slopes or uneven ground, and thus avoiding equipment damage or even accidents. However, traditional tractor parking brake mechanisms suffer from problems such as poor transmission reliability, insufficient reset stability, low coordination of brake cylinder linkages, and inconvenient assembly and maintenance, making it difficult to meet the safety and ease-of-use requirements of modern agricultural production and engineering operations. Utility Model Content

[0003] The purpose of this invention is to provide a tractor parking brake mechanism that provides reliable parking braking for tractors, addressing the above-mentioned problems.

[0004] To achieve the above objectives, this utility model discloses a tractor parking brake mechanism. Its structural features include two brake brackets spaced apart on the left and right, with a brake rotating shaft rotatably connected between them. One end of the brake rotating shaft is provided with a brake rocker arm, the outer end of which is connected to a brake handle assembly. A pull rod bracket is provided on each brake bracket, and a rocker arm rotating shaft is provided on the pull rod bracket. A first rocker arm and a second rocker arm are provided on the side wall of the rocker arm rotating shaft. The first rocker arm is provided with a reset device connected to the brake bracket and a rocker arm pull rod for controlling the brake. A brake caliper is provided on the brake bracket, and the drive shaft of the brake caliper is connected to the second rocker arm. A linkage mechanism connected to the rocker arm pull rod is provided on the brake rotating shaft.

[0005] With the above structure, the brake brackets spaced on the left and right provide stable support, while the brake rotating shaft is rotatably connected to the brackets and the brake caliper is fixed to the brackets, making the overall structure stable and ensuring that the mechanism is not easy to loosen or deform during braking. The brake caliper drive shaft is directly connected to the second rocker arm and the linkage mechanism links the brake rotating shaft and the rocker arm tie rod, forming a dual braking force transmission path. At the same time, it can efficiently transmit braking power to the braking system, avoid force transmission loss, and effectively prevent the tractor from slipping. The reset device set on the first rocker arm is directly connected to the brake bracket, which can accurately pull the first rocker arm back after braking, avoiding jamming of the braking components.

[0006] Preferably, the linkage mechanism includes a linkage swing arm that rotates coaxially with the brake rotating shaft. A first pull rod is provided on the linkage swing arm, and a connecting plate located on the upper side of the first rocker arm and connected to the rocker arm pull rod is provided at the lower part of the first pull rod. By having the linkage swing arm and the brake rotating shaft rotate coaxially in the linkage mechanism, their movements are synchronized. The connecting plate precisely connects the first pull rod and the rocker arm pull rod, which can reduce the gap between transmission components and avoid force transmission loss caused by misalignment. The layered connection structure of the first pull rod and the linkage swing arm, and the connecting plate and the rocker arm pull rod, makes the assembled components form a stable transmission unit, further enhancing the overall stability of the mechanism.

[0007] Preferably, the linkage swing arm includes a bushing connected to the brake rotating shaft. An extension plate is provided on the side wall of the bushing. The upper end face of the extension plate has a first insertion hole for inserting a first pull rod. The upper end face of the extension plate at the first insertion hole has a first arc-shaped groove parallel to the brake rotating shaft. A first arc-shaped limiting block is provided on the first pull rod, and the lower part of the first arc-shaped limiting block is adapted to the first arc-shaped groove. The linkage swing arm is tightly connected to the brake rotating shaft via the bushing. The extension plate provides a stable mounting base, and the adaptation of the first arc-shaped groove and the first arc-shaped limiting block ensures stable transmission. The first insertion hole on the extension plate facilitates quick insertion of the first pull rod, and the arc-shaped structure allows for fine adjustment of the pull rod within a certain range.

[0008] Preferably, the first rocker arm extends forward horizontally and forms an obtuse angle with the second rocker arm. The front end of the first rocker arm is provided with a first connecting lug for a reset device. The first rocker arm has a second insertion hole penetrating both its upper and lower ends. A second arc-shaped groove parallel to the brake rotation shaft is provided at the second insertion hole on the upper end of the first rocker arm. A second arc-shaped limiting block connected to the rocker arm pull rod is provided at the second arc-shaped groove, and the lower part of the second arc-shaped limiting block is adapted to the second arc-shaped groove. The first and second rocker arms are set at an obtuse angle. When the brake caliper drives the second rocker arm, the driving force can be more effectively transmitted to the first rocker arm, preventing unilateral brake failure. Furthermore, the second arc-shaped groove and the second arc-shaped limiting block fit together, limiting the displacement of the rocker arm pull rod on the first rocker arm and ensuring that the pull rod always travels along a preset trajectory, thus improving braking reliability.

[0009] Preferably, the connecting plate is provided with a first mounting hole and a second mounting hole at intervals. The first mounting hole and the second mounting hole penetrate the upper and lower end faces of the connecting plate. The size of the first mounting hole and the second mounting hole are respectively adapted to the diameter of the first pull rod and the rocker arm pull rod. The size of the first mounting hole and the second mounting hole on the connecting plate are adapted to the diameter of the first pull rod and the rocker arm pull rod, respectively. After the rods are assembled with the connecting plate, they fit tightly without any looseness or gaps, avoiding force transmission delay or abnormal noise caused by gaps during braking, and improving transmission efficiency.

[0010] Preferably, the first pull rod is provided with a first limiting nut located on the lower side of the connecting plate and the upper side of the first arc-shaped limiting block, and the upper part of the rocker arm pull rod is provided with a second limiting nut that fits the connecting plate against the upper end face of the second arc-shaped limiting block. The first limiting nut limits the position of the connecting plate on the first pull rod, while the second limiting nut fits the connecting plate against the second arc-shaped limiting block. The nut locks to prevent the connecting plate from shifting during braking, prevents the transmission clearance from increasing, and ensures long-term stable braking effect.

[0011] Preferably, the reset device includes a reset spring and a spring connecting seat disposed at the front of the brake bracket. One end of the reset spring is connected to the spring connecting seat, and the other end is connected to the first connecting lug plate at the front of the first rocker arm. The spring connecting seat of the reset device provides stable and fixed support for the reset spring, preventing the spring from shifting or falling off due to bumps when directly mounted on the end of the rocker arm, and ensuring that the spring can accurately pull the first rocker arm back to its original position after braking.

[0012] Preferably, the brake bracket includes a horizontally positioned mounting plate, with a vertical limiting plate perpendicular to the upper surface of the positioning mounting plate. The limiting plates of the left and right brake brackets are arranged parallel to each other. The tie rod bracket consists of two spaced-apart positioning lugs vertically connected to the upper surface of the positioning mounting plate. The tie rod bracket on the positioning mounting plate is located inside the limiting vertical plate. The positioning mounting plate provides a horizontal fixed foundation, and the limiting vertical plate is vertically connected to the mounting plate, forming a stable "plate-vertical plate" support structure that can withstand the impact force during braking and prevent bracket deformation. The vertically connected positioning lugs of the tie rod bracket further enhance the installation stability of the transmission components. The tie rod bracket being located inside the limiting vertical plate avoids spatial interference with other components of the tractor chassis, ensuring smooth movement of the rocker arm shaft and the first and second rocker arms.

[0013] Preferably, the brake lever assembly includes a handbrake lever and a traction shaft connected to the handbrake lever. The other end of the traction shaft is provided with a U-shaped connecting plate hinged to the brake rocker arm. The lower part of the U-shaped connecting plate is connected to the brake rocker arm via a pin, and the upper part is connected to the traction shaft. By using the handbrake lever as a manual control component, it conforms to ergonomic operating habits, allowing operators to easily pull the lever to apply the brakes without complex operations, thus improving ease of use. The traction shaft has flexible transmission characteristics, adaptable to the tractor chassis space layout, and avoids the installation limitations of rigid transmission components. The U-shaped connecting plate is hinged to the brake rocker arm via a pin, ensuring smooth force transmission to the brake rocker arm without any jamming during the force transmission process.

[0014] Preferably, the front end of the first rocker arm is provided with a first connecting ear plate for connecting the reset device. The first connecting ear plate for connecting the reset device at the front end of the first rocker arm provides a precise connection point for the reset device, which can prevent pull-out or jamming during reset and ensure smooth return of the mechanism after braking.

[0015] In summary, the beneficial effects of this utility model are as follows: This utility model has a stable structure and can reliably brake the tractor. The brake brackets arranged at intervals on the left and right provide stable support, while the brake rotating shaft is rotatably connected to the bracket and the brake caliper is fixed to the bracket, making the overall structure stable and ensuring that the mechanism is not easily loosened or deformed during braking. The brake caliper drive shaft is directly connected to the second rocker arm and the linkage mechanism links the brake rotating shaft and the rocker arm pull rod, forming a dual braking force transmission path. At the same time, it can efficiently transmit braking power to the braking system, avoid force transmission loss, and effectively prevent the tractor from slipping. The reset device set on the first rocker arm is directly connected to the brake bracket, which can accurately pull the first rocker arm back after braking, avoiding jamming of the braking components. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the installation structure at the tie rod bracket of this utility model; Figure 3 This is a schematic diagram of the linkage mechanism of this utility model; Figure 4 This is a schematic diagram of the connection structure of the reset device of this utility model; Figure 5 This is a cross-sectional structural schematic diagram of the linkage swing arm of this utility model; Figure 6 This is a cross-sectional view of the first rocker arm of this utility model.

[0017] In the diagram: 1. Brake bracket; 2. Brake rotating shaft; 3. Brake rocker arm; 4. Brake handle assembly; 5. Tie rod bracket; 6. Rocker arm rotating shaft; 7. First rocker arm; 8. Second rocker arm; 9. Reset device; 10. Rocker arm tie rod; 11. Brake slave cylinder; 12. Linkage mechanism; 13. Linkage swing arm; 14. First tie rod; 15. Connecting plate; 16. Bushing; 17. Extension plate; 18. First insertion hole; 19. First arc-shaped groove; 20. 21. First arc-shaped limiting block; 22. First connecting ear plate; 23. Second insertion hole; 24. Second arc-shaped groove; 25. Second arc-shaped limiting block; 26. First mounting hole; 27. Second mounting hole; 28. First limiting nut; 29. ​​Second limiting nut; 30. Reset tension spring; 31. Tension spring connecting seat; 32. Positioning mounting plate; 33. Limiting vertical plate; 34. Positioning ear plate; 35. Handbrake handle; 36. Traction shaft; 37. U-shaped connector. Detailed Implementation

[0018] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0019] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0020] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly, for example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0021] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0022] like Figure 1 and Figure 2 as well as Figure 4 As shown, this utility model includes two brake brackets 1 spaced apart on the left and right, and a brake rotating shaft 2 rotatably connected between the two brake brackets 1. A brake rocker arm 3 is provided at one end of the brake rotating shaft 2, and the outer end of the brake rocker arm 3 is connected to the brake handle assembly 4. A pull rod bracket 5 is also provided on the brake bracket 1. In the design, the above-mentioned brake bracket 1 includes a positioning mounting plate 31 arranged in the horizontal direction. The upper surface of the positioning mounting plate 31 is provided with a vertical limiting plate 32 that is perpendicular to the positioning mounting plate 31. The vertical limiting plates 32 of the left and right brake brackets 1 are arranged parallel to each other. The pull rod bracket 5 consists of two positioning ear plates 33 spaced apart and vertically connected to the upper surface of the positioning mounting plate 31 in the vertical direction. The pull rod bracket 5 on the positioning mounting plate 31 is located inside the vertical limiting plate 32. In this way, the positioning mounting plate 31 provides a horizontal fixed foundation, and the limiting vertical plate 32 is vertically connected to the mounting plate, forming a stable "plate-vertical plate" support structure that can withstand the impact force during braking and prevent the bracket from deforming. The tie rod bracket 5 is a vertically connected positioning ear plate 33, which further enhances the installation stability of the transmission components. Because the tie rod bracket 5 is located inside the limiting vertical plate 32, it can avoid spatial interference with other components of the tractor chassis and ensure the smooth movement trajectory of the rocker arm shaft 6, the first rocker arm 8, and the second rocker arm 8.

[0023] like Figure 1 - Figure 4As shown, a rocker arm shaft 6 is provided on the tie rod bracket 5. A first rocker arm 7 and a second rocker arm 8 are provided on the side wall of the rocker arm shaft 6. In the design, the first rocker arm 7 is provided with a reset device 9 connected to the brake bracket 1 and a rocker arm pull rod 10 for controlling the brake. A brake caliper 11 is provided on the brake bracket 1 and the drive shaft of the brake caliper 11 is connected to the second rocker arm 8. A linkage mechanism 12 connected to the rocker arm pull rod 10 is provided on the brake rotating shaft 2. In the manufacturing process, the linkage mechanism 12 includes a linkage swing arm 13 that rotates coaxially with the brake rotating shaft 2. A first pull rod 14 is provided on the linkage swing arm 13. A connecting plate 15 located on the upper side of the first rocker arm 7 and connected to the rocker arm pull rod 10 is provided at the lower part of the first pull rod 14. In this way, the linkage arm 13 in the linkage mechanism 12 rotates coaxially with the brake rotating shaft 2, ensuring that the two move synchronously. The connecting plate 15 precisely connects the first pull rod 14 and the rocker arm pull rod 10, which can reduce the gap between transmission components and avoid the force transmission loss caused by misalignment. The layered connection structure of the first pull rod 14 and the linkage arm 13, and the connecting plate 15 and the rocker arm pull rod 10, makes the assembly of each component form a stable transmission unit, further enhancing the overall stability of the mechanism.

[0024] like Figure 1 - Figure 5 As shown, the aforementioned linkage swing arm 13 includes a bushing 16 connected to the brake rotating shaft 2. An extension plate 17 is provided on the side wall of the bushing 16, and a first insertion hole 18 for inserting the first pull rod 14 is provided on the upper end face of the extension plate 17. Typically, the first insertion hole 18 is an elongated hole and has a certain gap with the side wall of the first pull rod 14 to ensure that the first pull rod 14 has a certain space margin when it moves. A first arc-shaped groove 19 parallel to the brake rotating shaft 2 is provided at the first insertion hole 18. At the same time, a first arc-shaped limiting block 20 is provided on the first pull rod 14. The lower part of the first arc-shaped limiting block 20 is adapted to the curvature and length of the first arc-shaped groove 19. In this way, the linkage swing arm 13 is tightly connected to the brake rotating shaft 2 through the bushing 16. The extension plate 17 provides a stable mounting base. The first arc-shaped groove 19 is adapted to the first arc-shaped limiting block 20 to ensure transmission stability. The first insertion hole 18 on the extension plate 17 facilitates the quick insertion of the first pull rod 14. The arc-shaped structure and the elongated hole design of the first insertion hole 18 allow the pull rod to be finely adjusted within a certain range.

[0025] like Figure 1 , Figure 2 , Figure 4 as well as Figure 6As shown, the first rocker arm 7 extends forward in the horizontal direction. Typically, the angle between the first rocker arm 7 and the second rocker arm 8 is obtuse. This facilitates the drive rod of the brake caliper 11 to push the second rocker arm 8, thereby causing the first rocker arm 7 to rotate along the central axis of the rocker arm shaft 6. This, in turn, drives the rocker arm lever 10, which cooperates with the first rocker arm 7, to move. Of course, the connection structure between the drive rod of the brake caliper 11 and the second rocker arm 8 is a known structure, typically a sliding connection with a certain amount of play. While the drive rod moves linearly, it pushes... The second rocker arm 8 rotates along the central axis of the rocker arm shaft 6; a first connecting ear plate 21 for connecting the reset device 9 is provided at the front end of the first rocker arm 7, and a second insertion hole 22 is provided on the first rocker arm 7 through the upper and lower end faces of the first rocker arm 7; a second arc-shaped groove 23 parallel to the brake rotation shaft 2 is provided at the second insertion hole 22 on the upper end face of the first rocker arm 7, and a second arc-shaped limiting block 24 connected to the rocker arm tie rod 10 is also provided at the second arc-shaped groove 23, and the lower part of the second arc-shaped limiting block 24 is adapted to the second arc-shaped groove 23. Similarly, the second insertion hole 22 and the first insertion hole 18 are both oblong holes with a certain gap between them and the rocker arm rod 10, which facilitates their cooperation with the rocker arm rod 10 to drive its movement. Since the first rocker arm 7 and the second rocker arm 8 are set at an obtuse angle, when the brake caliper 11 drives the second rocker arm 8, the driving force can be more reasonably transmitted to the first rocker arm 7, preventing unilateral braking failure. The second arc-shaped groove 23 is adapted to the second arc-shaped limiting block 24 to limit the displacement of the rocker arm rod 10 on the first rocker arm 7, ensuring that the rod is always transmitted along the preset trajectory, which can improve braking reliability. The first connecting ear plate 21 of the reset device 9 connected to the front end of the first rocker arm 7 can provide a precise connection point for the reset device 9, which can avoid pull-out or jamming during reset and ensure smooth return of the mechanism after braking.

[0026] like Figure 1 , Figure 2 as well as Figure 4As shown, the connecting plate 15 is provided with a first mounting hole 25 and a second mounting hole 26 at intervals. The first mounting hole 25 and the second mounting hole 26 penetrate the upper and lower end faces of the connecting plate 15. The size of the first mounting hole 25 and the second mounting hole 26 are respectively adapted to the diameter of the first pull rod 14 and the rocker arm pull rod 10. In this way, by matching the size of the first mounting hole 25 and the second mounting hole 26 on the connecting plate 15 with the diameter of the first pull rod 14 and the rocker arm pull rod 10, the rods and the connecting plate 15 are tightly fitted after assembly without any looseness or gaps. This avoids the transmission delay or abnormal noise caused by gaps during braking and improves the transmission efficiency. In the design, a first limiting nut 27 is provided on the first pull rod 14, located on the lower side of the connecting plate 15 and the upper side of the first arc-shaped limiting block 20, while a second limiting nut 28 is provided on the upper part of the rocker arm pull rod 10 to fit the connecting plate 15 against the upper end face of the second arc-shaped limiting block 24. In this way, the first limiting nut 27 limits the position of the connecting plate 15 on the first pull rod 14, while the second limiting nut 28 attaches the connecting plate 15 to the second arc-shaped limiting block 24. The nut locks to prevent the connecting plate 15 from shifting during braking, prevents the transmission clearance from increasing, and ensures long-term stable braking effect.

[0027] like Figure 1 , Figure 2 as well as Figure 4 As shown, the aforementioned reset device 9 includes a reset spring 29 and a spring connecting seat 30 disposed at the front of the brake bracket 1. One end of the reset spring 29 is connected to the spring connecting seat 30, and the other end is connected to the first connecting ear plate 21 at the front of the first rocker arm 7. In this way, the spring connecting seat 30 of the reset device 9 provides stable and fixed support for the reset spring 29, preventing the spring from shifting or falling off due to bumps when it is directly mounted on the end of the rocker arm, and ensuring that the spring can accurately pull the first rocker arm 7 back to its original position after braking. The aforementioned brake handle assembly 4 includes a handbrake handle 34 and a traction shaft 35 connected to the handbrake handle 34. The other end of the traction shaft 35 is provided with a U-shaped connector 36 hinged to the brake rocker arm 3. The lower part of the U-shaped connector 36 is connected to the brake rocker arm 3 by a pin, and the upper part is connected to the traction shaft 35. Of course, the structure and connection method of the traction shaft 35 and the U-shaped connector 36 are well-known structures and will not be described in detail here. By using the handbrake handle 34 as a manual control component, it conforms to human operating habits. The operator can easily pull the handle to achieve braking without complicated operation, which improves the convenience of use. The traction shaft 35 has flexible transmission characteristics, which can be adapted to the spatial layout of the tractor chassis and avoid the installation limitations of rigid transmission components. The U-shaped connecting plate 15 is hinged to the brake rocker arm 3 through the pin, and the force transmission process is smooth, ensuring that the braking power can be smoothly transmitted to the brake rocker arm 3.

[0028] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A tractor parking brake mechanism, characterized in that: The device includes two brake brackets (1) spaced apart on the left and right, and a brake rotating shaft (2) rotatably connected between the two brake brackets (1). One end of the brake rotating shaft (2) is provided with a brake rocker arm (3). The outer end of the brake rocker arm (3) is connected to the brake handle assembly (4). A pull rod bracket (5) is provided on the brake bracket (1). A rocker arm rotating shaft (6) is provided on the pull rod bracket (5). A first rocker arm (7) and a second rocker arm (8) are provided on the side wall of the rocker arm rotating shaft (6). A reset device (9) connected to the brake bracket (1) and a rocker arm pull rod (10) for controlling the brake are provided on the first rocker arm (7). A brake caliper (11) is provided on the brake bracket (1) and the drive shaft of the brake caliper (11) is connected to the second rocker arm (8). A linkage mechanism (12) connected to the rocker arm pull rod (10) is provided on the brake rotating shaft (2).

2. The tractor parking brake mechanism as described in claim 1, characterized in that: The linkage mechanism (12) includes a linkage swing arm (13) that rotates coaxially with the brake rotating shaft (2). A first pull rod (14) is provided on the linkage swing arm (13). The lower part of the first pull rod (14) is provided with a connecting plate (15) located on the upper side of the first rocker arm (7) and connected to the rocker arm pull rod (10).

3. The tractor parking brake mechanism as described in claim 2, characterized in that: The linkage swing arm (13) includes a bushing (16) connected to the brake rotating shaft (2). An extension plate (17) is provided on the side wall of the bushing (16). The upper end face of the extension plate (17) is provided with a first insertion hole (18) for inserting the first pull rod (14). The upper end face of the extension plate (17) at the first insertion hole (18) is provided with a first arc-shaped groove (19) parallel to the brake rotating shaft (2). A first arc-shaped limiting block (20) is provided on the first pull rod (14). The lower part of the first arc-shaped limiting block (20) is adapted to the first arc-shaped groove (19).

4. The tractor parking brake mechanism as described in claim 1, characterized in that: The first rocker arm (7) extends forward in the horizontal direction and forms an obtuse angle with the second rocker arm (8). The first rocker arm (7) is provided with a second insertion hole (22) that penetrates the upper and lower ends of the first rocker arm (7). The second insertion hole (22) on the upper end of the first rocker arm (7) is provided with a second arc-shaped groove (23) that is parallel to the brake rotation shaft (2). The second arc-shaped groove (23) is provided with a second arc-shaped limiting block (24) that is connected to the rocker arm pull rod (10). The lower part of the second arc-shaped limiting block (24) is adapted to the second arc-shaped groove (23).

5. The tractor parking brake mechanism as described in claim 2, characterized in that: The connecting plate (15) is provided with a first mounting hole (25) and a second mounting hole (26) at intervals, and the first mounting hole (25) and the second mounting hole (26) penetrate the upper and lower end faces of the connecting plate (15).

6. The tractor parking brake mechanism as described in claim 5, characterized in that: The first pull rod (14) is provided with a first limiting nut (27) located on the lower side of the connecting plate (15) and the upper side of the first arc-shaped limiting block (20), and the upper part of the rocker arm pull rod (10) is provided with a second limiting nut (28) that attaches the connecting plate (15) to the upper end face of the second arc-shaped limiting block (24).

7. The tractor parking brake mechanism as described in claim 1, characterized in that: The reset device (9) includes a reset spring (29) and a spring connecting seat (30) disposed at the front of the brake bracket (1). One end of the reset spring (29) is connected to the spring connecting seat (30) and the other end is connected to the first connecting ear plate (21) at the front of the first rocker arm (7).

8. The tractor parking brake mechanism as described in claim 1, characterized in that: The brake bracket (1) includes a positioning mounting plate (31) arranged in the horizontal direction. The upper surface of the positioning mounting plate (31) is provided with a limiting vertical plate (32) of the vertical positioning mounting plate (31). The limiting vertical plates (32) of the left and right brake brackets (1) are arranged parallel to each other. The pull rod bracket (5) consists of two positioning ear plates (33) arranged at intervals and vertically connected to the upper surface of the positioning mounting plate (31) in the vertical direction. The pull rod bracket (5) on the positioning mounting plate (31) is located inside the limiting vertical plate (32).

9. The tractor parking brake mechanism as described in claim 1, characterized in that: The brake lever assembly (4) includes a handbrake lever (34) and a traction shaft (35) connected to the handbrake lever (34). The other end of the traction shaft (35) is provided with a U-shaped connector (36) hinged to the brake rocker arm (3). The lower part of the U-shaped connector (36) is connected to the brake rocker arm (3) by a pin, and the upper part is connected to the traction shaft (35).

10. The tractor parking brake mechanism as described in claim 1, characterized in that: The front end of the first rocker arm (7) is provided with a first connecting ear plate (21) for connecting the reset device (9).

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