Parking brake assembly

Abstract

The utility model discloses a parking brake assembly, which belongs to the field of harvesting equipment, and comprises a valve body, the valve body is fixedly arranged on the outer wall of a gearbox, a hydraulically driven parking assembly is arranged in the valve body, a first shaft and a second shaft which are used for power transmission and are parallel to each other are arranged in the gearbox, and the parking assembly is connected with the second shaft. The valve body is fixed to the outer wall of the gearbox, and the parking assembly is arranged in the valve body and connected with the second shaft, so that the braking device can directly act on a transmission shaft in the gearbox, the direct and effective parking braking effect is achieved, meanwhile, the internal space of the gearbox is not occupied, the gearbox structure can be simplified, hydraulic driving is adopted, and the service life of the gearbox is prolonged. Manual pulling is not needed, time and labor are saved, and the braking effect is better.

Description

Technical Field

[0001] The utility model belongs to the field of harvesting equipment, and more specifically, relates to a parking brake assembly. Background Art

[0002] The parking brake of harvesting machinery (such as a combine harvester, etc.) has always been one of the important safety items of the whole machine and is also a mandatory inspection item for the factory of the combine harvester.

[0003] In recent years, with the increase in the power of the whole machine and the feeding amount of the wheeled combine harvester, the trend of the whole machine becoming larger and larger is obvious, manifested as the widening of the cutting table, the thickening of the drum, and the enlargement of the grain bin. Eventually, the weight of the whole machine also continues to increase.

[0004] In the prior art, for example, the Chinese patent with the publication number CN104675886A discloses an agricultural machinery braking device, which includes a brake drum, a friction lining, brake shoes, and a brake backing plate. The brake drum, friction lining, and brake shoes are arranged from outside to inside in sequence. The brake drum is fixedly connected to the brake backing plate. A through hole is arranged in the middle of the brake backing plate. There is more than one brake shoe. Brake wheel cylinders, return springs, and adjusters are arranged on both sides of the brake shoe. Brake pistons are arranged at both ends of the brake wheel cylinder. The adjuster is fixedly connected to the brake shoe. The brake shoes are connected to each other through a return spring. There is more than one return spring. The brake wheel cylinder is connected with a brake fluid pipe, and the brake fluid pipe is fixedly connected to the brake backing plate by threads.

[0005] These traditional parking braking methods are generally: brake wheel type, drum type, and self - energizing type, which can no longer meet the braking needs. There are phenomena such as poor braking effect of the whole machine and failure to meet the braking requirements. Especially when fully loaded, there is even a phenomenon of vehicle creep and inability to park the vehicle. The safety is relatively poor and there are potential hazards. Moreover, mechanical braking is mostly used, and it is necessary to manually pull the operating lever, which requires a large amount of effort during operation, is laborious, and has poor comfort.

[0006] In view of this, the present application is specifically proposed. Content of the Utility Model

[0007] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a parking brake assembly. The utility model is realized through the following technical solutions:

[0008] A parking brake assembly includes a valve body, the valve body is fixedly arranged on the outer wall of the gearbox. A parking assembly is arranged inside the valve body. A first shaft and a second shaft for power transmission and parallel to each other are arranged in the gearbox. The parking assembly is connected to the second shaft.

[0009] Preferably, a piston is slidably disposed inside the valve body. A piston chamber is formed between the piston and the valve body. The piston is sleeved outside the second shaft. An outer friction plate is fixedly disposed on the piston, and an inner friction plate is fixedly disposed on the second shaft. The inner friction plate and the outer friction plate are pressed together to form the braking force for parking.

[0010] Preferably, at least one return spring is disposed between the piston and the valve body. Two ends of the return spring respectively abut against the piston and the valve body.

[0011] Preferably, the return spring is disposed on an eccentric side of the valve body. A connecting bolt is installed at the center of the valve body. The connecting bolt penetrates through the valve body and the piston, and a limit nut is installed at one end of the connecting bolt extending into the piston.

[0012] Preferably, the connecting bolt and the valve body are in threaded fit, and the connecting bolt and the piston are in clearance fit.

[0013] Preferably, at least one guiding slide column is further disposed between the valve body and the piston.

[0014] Preferably, a hydraulic interface is opened on the piston chamber.

[0015] Preferably, one end of the chamber inside the valve body far from the transmission is radially recessed to form a cylindrical movable chamber. One end of the piston extending into the movable chamber is radially protruded to form a sealing portion. The outer circumferential surface of the sealing portion abuts against the movable chamber, and a piston chamber is formed between the end face of the sealing portion close to the transmission and the movable chamber.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] 1. By fixing the valve body on the outer wall of the transmission and arranging a parking assembly inside to be connected with the second shaft, the braking device can directly act on the transmission shaft inside the transmission, achieving a direct and effective parking braking effect. Meanwhile, it does not occupy the internal space of the transmission, which is beneficial to simplifying the transmission structure. At the same time, it adopts hydraulic drive, eliminating the need for manual pulling, saving time and effort, and having a better braking effect.

[0018] 2. The braking force is generated through the pressing action of the inner friction plate and the outer friction plate, which not only improves the braking efficiency but also can meet the high-strength braking requirements of large-tonnage vehicles.

[0019] 3. By arranging the return spring, it is ensured that when starting the braking state is needed, the piston can quickly return to position, pressing the inner friction plate and the outer friction plate together, avoiding untimely supply of the braking force, and ensuring the safety of the vehicle during parking. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the parking assembly of the present utility model;

[0021] Figure 2 It is a schematic diagram of the installation and layout of the present utility model.

[0022] In the figure: 11, a first shaft; 12, a second shaft; 21, a valve body; 211, a piston chamber; 212, an internal friction plate; 213, a return spring; 214, a connecting bolt; 215, a limit nut; 216, a guiding slide column; 217, a hydraulic interface; 22, a piston; 221, an external friction plate; 23, a parking assembly. Specific embodiments

[0023] The present utility model will be further described and illustrated below with reference to the accompanying drawings.

[0024] As Figure 1 and Figure 2 shown, this embodiment provides a parking brake assembly, including a valve body 21 fixedly arranged on the outer wall of the gearbox. A parking assembly 23 is arranged inside the valve body 21. A first shaft 11 and a second shaft 12 for power transmission and parallel to each other are arranged inside the gearbox. The parking assembly 23 is connected to the second shaft 12. The first shaft 11 is used to receive power and transmits the power to the second shaft 12 through transmission components such as gears and a shifting structure 13.

[0025] By fixing the valve body 21 on the outer wall of the gearbox and arranging the parking assembly 23 inside and connecting it to the second shaft 12, the braking device can directly act on the transmission shaft inside the gearbox, achieving a direct and effective parking braking effect. At the same time, it does not occupy the internal space of the gearbox, which is beneficial to simplifying the structure of the gearbox. At the same time, it adopts hydraulic drive, eliminating the need for manual pulling, saving time and effort, and having a better braking effect.

[0026] Preferably, a piston 22 is slidably arranged inside the valve body 21. A piston chamber 211 is formed between the piston 22 and the valve body 21. The piston 22 is sleeved outside the second shaft 12. An external friction plate 221 is fixedly arranged on the piston 22. An internal friction plate 212 is fixedly arranged on the second shaft 12. The internal friction plate 212 and the external friction plate 221 are pressed together to form the braking force for parking.

[0027] The braking force is generated through the pressing action of the internal friction plate 212 and the external friction plate 221, which not only improves the braking efficiency but also can meet the high-strength braking requirements of large-tonnage vehicles.

[0028] Preferably, at least one return spring 213 is provided between the piston 22 and the valve body 21, and the two ends of the return spring 213 are respectively abutted against the piston 22 and the valve body 21. By providing the return spring 213, it is ensured that when the braking state needs to be started, the piston 22 can be quickly returned to press the inner friction plate 212 and the outer friction plate 221, thereby avoiding untimely supply of braking force and ensuring the safety of the vehicle when parking.

[0029] Furthermore, a plurality of return springs 213 are evenly arranged in an array along the circumference of the valve body 21 to ensure that the pressure acting on the piston 22 can be kept uniform.

[0030] Preferably, the return spring 213 is arranged on the eccentric side of the valve body 21, and a connecting bolt 214 is installed at the center of the valve body 21. The connecting bolt 214 passes through the valve body 21 and the piston 22. A limiting nut 215 is installed on one end of the connecting bolt 214 extending into the piston 22.

[0031] The eccentrically arranged return spring 213 and the centrally arranged connecting bolt 214 make the entire device more stable during operation, and the limiting nut 215 can prevent the piston 22 from being dislocated when impacted, thereby enhancing the reliability of the system.

[0032] Preferably, the connecting bolt 214 and the valve body 21 are threadedly matched, and the connecting bolt 214 and the piston 22 are clearance matched. The threaded match between the connecting bolt 214 and the valve body 21 and the clearance match between the connecting bolt 214 and the piston 22 facilitates assembly and disassembly, while also allowing a certain degree of freedom of movement, which helps to improve the service life and maintenance convenience of the system.

[0033] Furthermore, at least one guide slide 216 is provided between the valve body 21 and the piston 22. This further ensures the linearity and stability of the piston 22 in the reciprocating motion, reduces wear, and prolongs the life of the equipment. Preferably, two or more guide slides 216 are provided, evenly distributed between the valve body 21 and the piston 22.

[0034] Preferably, a hydraulic interface 217 is provided on the piston chamber 211, so that the parking brake system can be activated by hydraulic means, and the braking force can be released conveniently, which is suitable for the needs of heavy vehicles.

[0035] Preferably, the chamber in the valve body 21 is radially recessed at one end away from the gearbox to form a cylindrical active cavity, and the end of the piston 22 extending into the active cavity radially protrudes to form a sealing portion, and the outer circumferential surface of the sealing portion abuts against the active cavity, and a piston cavity 211 is formed between the end surface of the sealing portion close to the gearbox and the active cavity.

[0036] The design of the specially configured active chamber and sealing part not only ensures the effective sealing of the piston 22 but also forms a stable piston chamber 211, which helps improve the pressure transmission efficiency during braking and enhance the braking effect.

[0037] Specifically, the valve body 21 is of a split design for convenient installation and assembly. The valve body 21 itself has a through structure. A cylinder head is installed on the side of the valve body 21 away from the gearbox. The return spring 213 and the guide slide column 216 are installed between the cylinder head and the piston 211.

[0038] When the vehicle needs to park, the driver sends a signal to the hydraulic system by operating the controller. The hydraulic oil inside the valve body 21 is depressurized along the hydraulic interface 217. At this time, since there is no hydraulic pressure, the return spring 213 comes into play. The return spring 213 moves the piston 22 to the left and compresses the friction assembly composed of the inner friction plate 212 and the outer friction plate 221. Since the valve body 21 does not rotate and the cylinder head of the valve body 21 is bolted to the valve body 21, the cylinder head does not rotate either. The piston 22 is connected to the cylinder head by at least one eccentrically arranged guide slide column 216, so there is also an anti-rotation effect on the piston 22. The outer friction plate 221 is fixedly connected to the piston 22. The inner friction plate 212 and the outer friction plate 221 are pressed tightly together by the pressure of the return spring 213 and rotate together. The inner friction plate 212 is rigidly connected to the second shaft 12 of the gearbox through structures such as a combined gear sleeve steel and splines, thereby braking the second shaft 12 of the gearbox and cutting off the power of the gearbox, realizing the parking brake.

[0039] When the vehicle starts running again, by operating the controller, a signal is transmitted to the hydraulic system. The hydraulic oil enters the piston 22 system. The piston 22 moves to the right under the action of the hydraulic oil, and the return spring 213 is compressed. At this time, the inner and outer friction plates 221 are separated due to the lack of pressure, and the vehicle releases the parking brake restriction and the whole vehicle runs normally.

Claims

1. A parking brake assembly, comprising a valve body (21), characterized in that: The valve body (21) is fixedly arranged on the outer wall of the gearbox, a parking assembly (23) is arranged in the valve body (21), and the gearbox is provided with a first shaft (11) and a second shaft (12) which are parallel to each other and used for power transmission, and the parking assembly (23) is connected to the second shaft (12).

2. A parking brake assembly according to claim 1, characterized in that: A piston (22) is slidably disposed inside the valve body (21), a piston chamber (211) is formed between the piston (22) and the valve body (21), the piston (22) is sleeved on the outer sides of the two shafts (12), an outer friction plate (221) is fixedly disposed on the piston (22), an inner friction plate (212) is fixedly disposed on the two shafts (12), and the inner friction plate (212) and the outer friction plate (221) are pressed together to form a parking braking force.

3. A parking brake assembly according to claim 2, characterized in that: At least one return spring (213) is arranged between the piston (22) and the valve body (21), and two ends of the return spring (213) are respectively in contact with the piston (22) and the valve body (21).

4. A parking brake assembly according to claim 3, characterized in that: The return spring (213) is arranged on an eccentric side of the valve body (21); a connecting bolt (214) is installed at the center of the valve body (21); the connecting bolt (214) passes through the valve body (21) and the piston (22); and a limiting nut (215) is installed at one end of the connecting bolt (214) that extends into the piston (22).

5. A parking brake assembly according to claim 4, characterized in that: The connecting bolt (214) and the valve body (21) are threadedly matched, and the connecting bolt (214) and the piston (22) are clearance matched.

6. A parking brake assembly according to claim 4, characterized in that: At least one guide slide column (216) is provided between the valve body (21) and the piston (22).

7. The parking brake assembly according to claim 2, characterized in that: The piston chamber (211) is provided with a hydraulic interface (217).

8. The parking brake assembly according to claim 2, characterized in that: The end of the chamber in the valve body (21) away from the gearbox is radially recessed to form a cylindrical active cavity, and the end of the piston (22) extending into the active cavity is radially protruding to form a sealing portion, and the outer circumferential surface of the sealing portion abuts against the active cavity, and a piston cavity (211) is formed between the end surface of the sealing portion close to the gearbox and the active cavity.

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