Tractor brake assembly

Abstract

A tractor brake assembly relates to the technical field of tractor brakes and comprises a shell and a piston which are both of an annular structure, and the piston is installed in an inner cavity of the shell. A plurality of return devices are mounted between the shell and the piston; a plurality of mounting through holes are formed in the shell in the axial direction of the shell, the return device is coaxially mounted in the mounting through holes and comprises a pull rod, a pressure spring and an elastic cylindrical pin, the elastic cylindrical pin is arranged in the mounting through hole and is in interference fit with the mounting through hole, and the outer end of the pull rod penetrates through the elastic cylindrical pin and then is detachably connected with the piston; the compression spring is arranged on the periphery of the pull rod in a sleeving mode and elastically connected between the elastic cylindrical pin and the inner end of the pull rod in an abutting mode. The piston can automatically return, the piston return capacity is improved, normal use of a tractor brake assembly is guaranteed, and potential safety hazards of driving are reduced.

Description

Technical Field

[0001] This utility model relates to the field of tractor brake technology, and in particular to tractor brake assemblies. Background Technology

[0002] The main function of the brake is to stop the tractor and directly generate frictional torque to force the tractor wheels to slow down or stop. It can slow down the tractor or stop it in the shortest distance, limit the speed when driving downhill, and keep the tractor reliably parked in place. Therefore, the brake must have sufficient braking force and good braking stability.

[0003] Traditional braking systems mainly come in mechanical, pneumatic, hydraulic, and air-hydraulic hybrid types. Their working principles are basically similar: they utilize the friction generated during braking to dissipate the vehicle's kinetic energy, thereby slowing it down until it comes to a stop.

[0004] In traditional tractor brake assemblies, when the driver depresses the brake pedal, the brake fluid pressure pushes the brake piston against the friction pads, achieving braking through friction between the piston and the pads. Normally, after releasing the brake fluid pressure, the piston should completely separate from the friction pads and stop friction. However, prolonged use may reduce the elastic restoring force of the rubber seals, affecting the piston's normal return and causing the piston and friction pads to remain in a locked or partially engaged state. This abnormal condition can lead to abnormal brake temperature rise, internal brake fluid leakage, and even loss of braking performance, posing a significant safety hazard. Utility Model Content

[0005] In view of this, the technical problem to be solved by this utility model is to provide a tractor brake assembly that enables the piston to return to its original position automatically, improves the piston return capability, ensures the normal use of the tractor brake assembly, and reduces driving safety hazards.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0007] A tractor brake assembly includes a housing and a piston, both of which are annular structures, with the piston installed inside the housing; a plurality of return devices are installed between the housing and the piston.

[0008] The housing has several mounting through holes along its axial direction. The return device is coaxially mounted in the mounting through holes. The return device includes a pull rod, a compression spring, and an elastic cylindrical pin. The elastic cylindrical pin is disposed in the mounting through holes and is interference-fitted with them. The outer end of the pull rod passes through the elastic cylindrical pin and is detachably connected to the piston. The compression spring is sleeved on the outer periphery of the pull rod and its elasticity abuts against the elastic cylindrical pin and the inner end of the pull rod.

[0009] Preferably, the pull rod is a screw, the head of the screw is the inner end of the pull rod, and the rod end of the screw is threadedly connected to the piston.

[0010] Preferably, the elastic cylindrical pin is positioned close to the piston and its outer end face is flush with the bottom of the inner cavity of the housing.

[0011] Preferably, the piston is provided with a plurality of connecting ears extending radially outward therefrom, and the outer end face of the housing is provided with a receiving groove, the connecting ears being located in the receiving groove, and the connecting ears being detachably connected to the outer end of the pull rod.

[0012] Preferably, the positions and quantities of the connecting ear, the receiving groove, the return device, and the mounting through hole correspond one-to-one.

[0013] Preferably, the number of the connecting ear, the receiving groove, the return device, and the mounting through hole are all three, and they are all equidistantly arranged along the circumference of the housing.

[0014] Preferably, the side wall of the housing is provided with a reinforcing part extending radially outward, the reinforcing part being disposed outside the receiving groove, and the position and number of the reinforcing part corresponding to the receiving groove.

[0015] Preferably, a plug is installed on the mounting through hole, the plug being located on the inner side of the pull rod along the axial direction of the mounting through hole, and the plug being accommodated within the mounting through hole.

[0016] Preferably, the mounting through hole is a countersunk hole, and a sealing gasket is provided between the plug and the mounting through hole.

[0017] Preferably, a friction plate is coaxially mounted on the outer side of the piston.

[0018] After adopting the above technical solution, the beneficial effects of this utility model are:

[0019] Since the tractor brake assembly of this application includes a housing and a piston, both of which are annular structures, the piston is installed in the inner cavity of the housing. The end face of the housing near the piston is defined as the outer end face, and the other end face of the housing away from the piston is defined as the inner end face. When the piston is subjected to the hydraulic force of hydraulic oil, it can be pushed to move towards the side closer to the outer end face of the housing, and abut against the friction plate or friction assembly to achieve the purpose of braking.

[0020] Several return devices are installed between the housing and the piston. These return devices are used to move the piston towards the side closer to the inner end face of the housing. After braking ends, the piston is no longer affected by hydraulic force. Therefore, by setting up return devices, the piston can be driven back to its initial position in a timely manner, improving the piston's return capability, ensuring complete separation from the friction pads, preventing the friction pads from being continuously locked or partially engaged, preventing brake overheating, and improving driving safety. This device is particularly suitable for use in mountainous, hilly areas or frequent braking conditions, effectively extending brake life, reducing brake overheating, and improving braking performance.

[0021] The housing has several mounting holes along its axial direction. A return device is coaxially mounted within these holes. The return device includes a pull rod, a compression spring, and a flexible cylindrical pin. The flexible cylindrical pin is positioned within the mounting holes and is interference-fitted with them. The outer end of the pull rod passes through the flexible cylindrical pin and is detachably connected to the piston. The inner end of the pull rod elastically abuts against the compression spring between itself and the flexible cylindrical pin. When the piston is moved outward by hydraulic force, it moves the pull rod outward, compressing the compression spring. When the piston is not affected by hydraulic force, the spring force is released, causing the piston to move inward via the pull rod, thus achieving the return operation. The structure is simple and easy to maintain.

[0022] As the piston moves outward and rubs against the friction pads, the thickness of the friction pads gradually decreases. This wear and tear directly weakens the braking efficiency between the piston and the friction pads. To maintain the necessary braking torque, the hydraulic system needs to increase the hydraulic pressure applied to the piston. Under this condition, the compression of the spring increases accordingly. When the compression reaches a threshold, the elastic cylindrical pin, driven by the spring, displaces axially outward, compensating for the increased clearance caused by friction pad wear. This compensation mechanism, through the dynamic adjustment of the elastic cylindrical pin, effectively maintains the optimal contact state between the piston and the friction pads, ensuring that the braking system maintains stable response characteristics and braking force transmission efficiency throughout the friction pad's lifespan, guaranteeing good braking response between the two. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of the tractor brake assembly according to an embodiment of the present invention;

[0025] Figure 2 yes Figure 1 A partial sectional view;

[0026] Figure 3 yes Figure 2 Enlarged view of part A;

[0027] Figure 4yes Figure 2 Enlarged view of part B;

[0028] Figure 5 yes Figure 4 A schematic diagram of the return mechanism in three-dimensional form;

[0029] Figure 6 yes Figure 2 A schematic diagram of the middle shell from another direction;

[0030] Figure 7 yes Figure 2 Schematic diagram of the middle piston;

[0031] In the picture:

[0032] 1. Housing; 11. Mounting through hole; 12. Receiving groove; 13. Reinforcing part;

[0033] 2. Piston; 21. Connecting lug;

[0034] 3. Return mechanism; 31. Pull rod; 32. Compression spring; 33. Elastic cylindrical pin;

[0035] 4. Plug cap; 41. Sealing gasket;

[0036] 5. Friction pads. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0038] like Figures 1 to 7 As shown, the tractor brake assembly of this application includes a housing 1 and a piston 2, both of which are annular structures. The piston 2 is installed in the inner cavity of the housing 1, and a friction pad 5 is coaxially mounted on the outer side of the piston 2. The end face of the housing 1 near the piston 2 is defined as the outer end face, and the other end face of the housing 1 away from the piston 2 is defined as the inner end face. When the piston 2 is subjected to the hydraulic force of hydraulic oil, it can be pushed to move towards the side near the outer end face of the housing 1, and abut against the friction pad 5 or friction assembly to achieve the braking purpose.

[0039] Several return devices 3 are installed between the housing 1 and the piston 2. The return devices 3 are used to drive the piston 2 to move towards the side closer to the inner end face of the housing 1. After braking ends, the piston 2 is no longer affected by hydraulic force. Therefore, by setting the return devices 3, the piston 2 can be driven to return to the initial position in a timely manner, improving the return capability of the piston 2, ensuring that it is completely separated from the friction pad 5, preventing it from being continuously locked or partially engaged with the friction pad 5, preventing the brake from overheating, and improving driving safety. This device is particularly suitable for use in mountainous, hilly areas or frequent braking conditions, and can effectively extend the service life of the brake, reduce brake overheating, and improve braking performance.

[0040] The housing 1 has several mounting through holes 11 along its axial direction. The return device 3 is coaxially installed in the mounting through holes 11. The return device 3 includes a pull rod 31, a compression spring 32 and an elastic cylindrical pin 33. The elastic cylindrical pin 33 is disposed in the mounting through hole 11 and is interference-fitted with it. The outer end of the pull rod 31 passes through the elastic cylindrical pin 33 and is detachably connected to the piston 2. The compression spring 32 is sleeved on the outside of the pull rod 31 and its elasticity abuts against the inner end of the elastic cylindrical pin 33 and the pull rod 31.

[0041] Preferably, the pull rod 31 is a screw, the head of the screw is the inner end of the pull rod 31, and the rod end of the screw is threadedly connected to the piston 2.

[0042] When piston 2 is driven outward by hydraulic force, it can drive the pull rod 31 to move outward together, thereby compressing the compression spring 32; when piston 2 is not affected by hydraulic force, the elastic force of compression spring 32 is released, and the piston 2 is driven inward by pull rod 31 to realize the return operation. The structure is simple and easy to maintain.

[0043] As piston 2 moves outward and rubs against friction plate 5, the thickness of friction plate 5 gradually decreases. This wear and tear directly weakens the braking performance between piston 2 and friction plate 5. To maintain the necessary braking torque, the hydraulic system needs to increase the hydraulic pressure applied to piston 2. Under this condition, the compression of spring 32 increases accordingly. When the compression reaches a threshold, elastic cylindrical pin 33, driven by spring 32, displaces axially outward, compensating for the increased clearance caused by friction plate 5 wear. This compensation mechanism, through the dynamic adjustment of elastic cylindrical pin 33, effectively maintains the optimal contact state between piston 2 and friction plate 5, ensuring that the braking system maintains stable response characteristics and braking force transmission efficiency throughout the lifespan of friction plate 5, thus guaranteeing good braking response between the two.

[0044] In this application, the elastic cylindrical pin 33 is positioned close to the piston 2 and its outer end face is flush with the bottom of the inner cavity of the housing 1. Under normal conditions, the elastic cylindrical pin 33 will not interfere with the piston 2. Only when it is necessary to compensate for the gap between the piston 2 and the friction plate 5, the elastic cylindrical pin 33 will move outward due to the compression of the compression spring 32, thereby extending its outer end face out of the bottom of the inner cavity of the housing 1.

[0045] When the piston 2 is connected to the pull rod 31, in order to prevent damage to the piston 2 body and to facilitate the installation of the two, preferably, the piston 2 is provided with a plurality of connecting ears 21 extending radially outward, and a receiving groove 12 is provided on the outer end face of the housing 1, the connecting ears 21 are located in the receiving groove 12, and the connecting ears 21 are detachably connected to the outer end of the pull rod 31. Wherein, the detachable connection indicated in this application is a threaded connection.

[0046] The positions and numbers of the connecting lugs 21, receiving grooves 12, return devices 3, and mounting through holes 11 correspond one-to-one. Preferably, there are three connecting lugs 21, receiving grooves 12, return devices 3, and mounting through holes 11, all equidistantly arranged along the circumference of the housing 1. This equidistant arrangement ensures uniform force on the piston 2, prevents displacement during its return process, and ensures good braking with the friction plate 5 during the next braking action. Simultaneously, the connecting lugs 21, located within the receiving grooves 12, also prevent the piston 2 from rotating, providing an anti-rotation effect.

[0047] In order to enhance the mechanical strength near the receiving groove 12 on the housing 1, a reinforcing part 13 is provided on the side wall of the housing 1, extending radially outward. The reinforcing part 13 is located on the outside of the receiving groove 12, and the position and number of the reinforcing part 13 correspond one-to-one with the receiving groove 12.

[0048] A plug 4 is installed on the mounting through hole 11, and the plug 4 is located inside the tie rod 31 along the axial direction of the mounting through hole 11. The plug 4 seals the oil in the mounting through hole 11 to prevent it from leaking out of the mounting through hole 11. In order to improve the sealing effect, the mounting through hole 11 is set as a countersunk hole. A sealing gasket 41 is provided between the plug 4 and the mounting through hole 11. Both the sealing gasket 41 and the plug 4 are accommodated in the mounting through hole 11.

[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tractor brake assembly, comprising a housing and a piston, both of which are annular structures, the piston being mounted within the cavity of the housing; characterized in that, Several return devices are installed between the housing and the piston; The housing has several mounting through holes along its axial direction. The return device is coaxially mounted in the mounting through holes. The return device includes a pull rod, a compression spring, and an elastic cylindrical pin. The elastic cylindrical pin is disposed in the mounting through holes and is interference-fitted with them. The outer end of the pull rod passes through the elastic cylindrical pin and is detachably connected to the piston. The compression spring is sleeved on the outer periphery of the pull rod and its elasticity abuts against the elastic cylindrical pin and the inner end of the pull rod.

2. The tractor brake assembly as described in claim 1, characterized in that, The pull rod is a screw rod, the head of the screw rod is the inner end of the pull rod, and the rod end of the screw rod is threadedly connected to the piston.

3. The tractor brake assembly as described in claim 1, characterized in that, The elastic cylindrical pin is positioned close to the piston and its outer end face is flush with the bottom of the inner cavity of the housing.

4. The tractor brake assembly as described in claim 1, characterized in that, The piston is provided with a plurality of connecting lugs extending radially outward therefrom, and the outer end face of the housing is provided with a receiving groove, the connecting lugs being located in the receiving groove, and the connecting lugs being detachably connected to the outer end of the pull rod.

5. The tractor brake assembly as described in claim 4, characterized in that, The positions and quantities of the connecting ear, the receiving groove, the return device, and the mounting through hole correspond one-to-one.

6. The tractor brake assembly as described in claim 5, characterized in that, The number of connecting ears, receiving grooves, return devices, and mounting through holes are all three, and they are all equidistantly arranged along the circumference of the housing.

7. The tractor brake assembly as claimed in claim 4, characterized in that, The side wall of the housing is provided with a reinforcing part that extends radially outward. The reinforcing part is located outside the receiving groove, and the position and number of the reinforcing part correspond one-to-one with the receiving groove.

8. The tractor brake assembly as claimed in claim 1, characterized in that, A plug is installed on the mounting through hole, and the plug is located inside the tie rod along the axial direction of the mounting through hole, and the plug is accommodated within the mounting through hole.

9. The tractor brake assembly as claimed in claim 8, characterized in that, The mounting through hole is a countersunk hole, and a sealing gasket is provided between the plug and the mounting through hole.

10. The tractor brake assembly as claimed in claim 1, characterized in that, A friction plate is coaxially mounted on the outside of the piston.

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