Resident brake structure

Abstract

The application provides a parking and driving integrated brake structure. The parking and driving integrated brake structure comprises a piston shell, a brake shell, a parking brake piston, a driving brake piston, a parking brake spring, a driving brake spring and a brake. One side of the piston shell is provided with the parking brake piston, and the other side is sequentially provided with the driving brake piston, the brake and the brake shell. The inner side of the parking brake piston or the driving brake piston is provided with a transmission part penetrating through the piston shell and abutting against the other piston. The piston shell is provided with a parking brake oil channel and a driving brake oil channel respectively extending to the inner side of the parking brake piston and the driving brake piston. The parking brake spring and the driving brake spring are arranged outside the parking brake piston and the driving brake piston. The parking and driving integrated brake structure provided by the application solves the defects of low reliability, complex structure and easy damage of the traditional scheme.

Description

Technical Field

[0001] This invention relates to the field of brakes, and more specifically to a brake structure that integrates driving and parking functions. Background Technology

[0002] For industrial vehicles and construction machinery, the service brake and parking brake in the drive axle of the chassis are separate structures that are installed together. Specifically, traditional service brakes and parking brakes (such as...) Figure 1 In this system, the service brake is a wet brake composed of piston housing 1, piston 7, friction pads 12, steel plates 11, etc., and a separate parking brake is also installed, which, together with the brake disc at the end of the output shaft 2, forms the service and parking braking systems. These systems respectively realize the service braking function during vehicle movement and the parking braking function after the vehicle has stopped. Figure 1 In the middle section: Piston housing 1, Output shaft 2, Brake housing 3, Parking brake 4, Large end service brake seal ring 5, Small end service brake seal ring 6, Piston 7, Service brake limit bolt 8, Return coil spring 9, Service brake friction pad support 10, Matching steel plate 11, Friction plate 12).

[0003] Specifically, traditional service brakes have the following drawbacks: the O-ring seal structure has low reliability, posing a risk of brake failure due to oil leakage; the return spring uses a coil spring structure, which has weak spring return force, requiring control of the back pressure fluctuation range. Traditional parking brakes have the following drawbacks: caliper disc brakes are bulky and costly, and the brake disc structure leads to a complex overall output shaft structure; generally located on the outside of the structure, they are greatly affected by the external environment, and mud, gravel, etc., can easily enter the brake's interior, leading to premature brake damage. Summary of the Invention

[0004] To address the shortcomings of traditional service brakes and parking brakes, such as low reliability, complex structure, and susceptibility to damage, this invention provides a structure for an integrated service and parking brake that solves the above problems.

[0005] A parking brake integrated structure includes a piston housing, a brake housing, a parking brake piston, a service brake piston, a parking brake spring, a service brake spring, and a brake. The parking brake piston is located on one side of the piston housing, and the service brake piston, the brake, and the brake housing are sequentially located on the other side. A transmission member is provided inside the parking brake piston or the service brake piston, passing through the piston housing and abutting against another piston. The piston housing has a parking brake oil passage and a service brake oil passage, which extend to the inside of the parking brake piston and the service brake piston, respectively. The parking brake spring and the service brake spring are located outside the parking brake piston and the service brake piston, respectively.

[0006] In a preferred embodiment of the integrated service brake structure provided by the present invention, the piston housing is provided with a limiting bolt that penetrates the service brake piston, and a service brake spring is provided between the outer end of the limiting bolt and the service brake piston. The service brake spring is a disc spring assembly, with multiple disc springs sleeved around the limiting bolt.

[0007] The piston housing has a limiting member located outside the parking brake piston, and the parking brake spring is located between the limiting member and the parking brake piston. The parking brake spring is a disc spring assembly, with multiple disc springs disposed within the piston housing.

[0008] In a preferred embodiment of the integrated parking brake structure provided by the present invention, the parking brake piston, the service brake piston, and the transmission component are respectively provided with one or more sealing elements between themselves and the piston housing. The sealing elements are distributed on the inner and outer sides of the parking brake oil passage and on the inner and outer sides of the service brake oil passage.

[0009] Some or all of the sealing elements are Y-type sealing elements, including a sealing ring and a retaining ring with Y-shaped and square cross-sections respectively arranged side by side. The sealing ring is located on the side closer to the oil passage, and the retaining ring is located on the side away from the oil passage. The open end of the sealing ring faces the direction of the oil passage.

[0010] In a preferred embodiment of the integrated parking brake structure provided by the present invention, the drive shaft passes sequentially through the parking brake piston, the transmission component, and the service brake piston, connects to the brake, and then passes through the brake housing.

[0011] In a preferred embodiment of the integrated parking brake structure provided by the present invention, the parking brake oil passage and the service brake oil passage are pressurized to push the parking brake piston and the service brake piston outward, and the parking brake spring and the service brake spring respectively push the parking brake piston and the service brake piston inward. The oil pressure thrust of the parking brake oil passage is greater than the thrust of the parking brake spring, the oil pressure thrust of the service brake oil passage is greater than the thrust of the service brake spring, and the thrust of the parking brake spring is greater than the thrust of the service brake spring.

[0012] When the vehicle is braking, the parking brake oil passage is pressurized, which pushes the parking brake piston outward and presses the parking brake spring. The service brake oil passage is pressurized to counteract the service brake spring and control the service brake piston to squeeze the brake, thereby achieving service braking. When the parking brake is applied, both the parking brake oil passage and the service brake oil passage are depressurized. The parking brake spring pushes the parking brake piston inward, and the parking brake piston pushes the service brake piston to squeeze the brake via the transmission component, thereby achieving parking brake application.

[0013] Compared with the prior art, the integrated driving and parking brake structure provided by the present invention has the following beneficial effects: 1. The integrated driving and parking brake structure provided by this invention improves the sealing components. The seal on the frequently moving driving brake piston is replaced with a Y-type seal, which offers advantages such as high stability and good pressure resistance, avoiding the risk of brake failure due to oil leakage. Meanwhile, the seal on the less frequently moving parking brake piston is retained as an O-type seal to reduce production costs.

[0014] Specifically, the high stability is reflected in the fact that O-ring seals, due to their circular cross-section, can twist during the reciprocating motion of the brake piston, affecting their sealing performance. In contrast, Y-ring seals, with their rectangular cross-sections for both the sealing ring and retaining ring, and the support of the retaining ring, do not twist. The high pressure resistance is reflected in the fact that the sealing ring in a Y-ring has a lip-type pressure-bearing surface; during reciprocating motion, the lip is compressed and then expanded (…). Figure 4 ), to improve pressure resistance.

[0015] 2. The integrated driving and parking brake structure provided by the present invention improves the spring by replacing the traditional spiral spring with a butterfly spring assembly, which has the advantages of small mechanism space and high pressure.

[0016] Specifically, the disc spring assembly occupies little space; only a shallow countersunk hole needs to be arranged on the piston to accommodate the structure of the disc spring assembly. This saves hole space and reduces manufacturing costs. Due to the structural advantages of the disc spring assembly, it can generate greater force with the same unit deformation, thereby improving the system's resistance to back pressure. Furthermore, the short stroke of the disc spring compared to the coil spring can be addressed by replacing it with the structure of the disc spring assembly.

[0017] 3. The parking brake structure provided by this invention adopts a built-in parking brake design, integrating the parking and driving functions. This solves the problems of traditional parking brakes, which are bulky, complex, costly, and susceptible to premature damage due to external environmental influences.

[0018] This invention utilizes a newly added parking brake piston and parking brake disc spring assembly, combining existing service brakes to form an integrated service and parking brake structure. This eliminates the bulky structure of caliper disc brakes, solves the problem of early damage due to external environmental influences, optimizes the output shaft and the entire system structure, reduces risk points, and lowers costs. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of an existing split brake; Figure 2 This is a cross-sectional view of the integrated driving and parking brake structure; Figure 3This is an enlarged view of the location of the seal in the integrated parking brake structure; Figure 4 This is a cross-sectional view of the seal.

[0020] The following are labeled in the diagram: Piston housing 11, Brake housing 12, Parking brake oil passage 13, Service brake oil passage 14, Parking brake piston 21, Parking brake spring 22, Limiting retaining ring 23, Limiting block 24, Service brake piston 31, Service brake spring 32, Limiting bolt 33, Drive shaft 41, Support 42, Friction plate 43, Matching steel plate 44, O-ring seal 51, Sealing ring 52, Retaining ring 53. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0022] Please also refer to Figures 2 to 4 These are, respectively, a cross-sectional view of the integrated driving and parking brake structure provided by the present invention, an enlarged view of the seal position, and a cross-sectional view of the seal.

[0023] The integrated parking brake structure includes a piston housing 11, a brake housing 12, a parking brake oil passage 13, a service brake oil passage 14, a parking brake piston 21, a parking brake spring 22, a limit retaining ring 23, a limit block 24, a transmission component 25, a service brake piston 31, a service brake spring 32, a limit bolt 33, a drive shaft 41, a brake, an O-ring seal 51, and a Y-ring seal.

[0024] The piston housing 11 has a groove on each of its left and right sides, and the two grooves are connected by a channel that passes through the piston housing 11. The parking brake piston 21 and the service brake piston 31 are respectively placed in the two grooves. The parking brake piston 21 and the service brake piston 31 can slide left and right in the grooves, and their inner sides can fit against the bottom of the grooves.

[0025] The parking brake piston 21 is disc-shaped, with a mounting groove around its outer edge for mounting an O-ring seal 51. An axial protrusion is located at the center of the right side of the parking brake piston 21, serving as a transmission component that inserts into the channel between the grooves to push the service brake piston 31. A mounting groove is also located around the outer edge of this transmission component for mounting the O-ring seal 51.

[0026] The service brake piston 31 is a double-layered disc, consisting of two sections, one thinner on the left and one thicker on the right. A mounting groove is provided on the outer edge of each section for mounting a Y-type seal.

[0027] The piston housing 11 is provided with a parking brake oil passage 13 and a service brake oil passage 14. The parking brake oil passage 13 leads to the right edge of the parking brake piston 21, and the service brake oil passage 14 leads to the position between the two sections of the service brake piston 31.

[0028] The O-ring seal 51 is a rubber sealing ring with an O-shaped cross-section. The Y-ring seal includes a rubber sealing ring 52 with a Y-shaped cross-section and a retaining ring 53 with a square cross-section. The sealing ring 52 is located on one side of the mounting groove near the service brake fluid passage 14, and the retaining ring 53 is located on the other side. The opening of the sealing ring 52 faces the service brake fluid passage 14.

[0029] The rubber sealing ring 52 has a Y-shaped cross-section. The side of the opening end closer to the drive shaft 41 has a longer wing, while the other side has a shorter wing and a protrusion on the side farther from the drive shaft 41. A second protrusion is also provided on the side farther from the drive shaft 41, near the retaining ring 53.

[0030] On the left side of the piston housing 11, a groove is formed along the inner wall of the left side recess, containing a retaining ring 23. Further along the retaining ring 23, a retaining block 24 is formed to increase the force-bearing area. The retaining block 24 supports the left edge of the parking brake spring 22. On the left side of the parking brake piston 21, a recess is formed along the edge to support the right side of the parking brake spring 22. The parking brake spring 22 is a pair of large disc springs.

[0031] A groove on the right side of the piston housing 11 has a ring of multiple threaded blind holes. A limiting bolt 33 passes through the right side of the service brake piston 31 and is screwed into the limiting bolt 33 for fixation. On the right side of the service brake piston 31, where the limiting bolt 33 passes through, an additional recess is provided to support the service brake spring 32. Outside the limiting bolt 33, between its right end and the service brake piston 31, the service brake spring 32 is fitted. The service brake spring 32 consists of three pairs of smaller disc springs.

[0032] The right side of the service brake piston 31 abuts against the brake and the brake housing 12 in sequence, and the brake housing 12 is further fixed to the right side of the piston housing 11. The drive shaft 41 passes through the center of the brake housing 12, the parking brake piston 21, the transmission component 25, and the service brake piston 31, without contacting the aforementioned mechanisms. The brake includes alternating paired steel plates 44 and friction plates 43, and the friction plates 43 are fixed to the drive shaft 41 by a support 42.

[0033] The parking brake oil passage 13 and the service brake oil passage 14 are respectively connected to the hydraulic system, enabling functions such as pressurization, pressure release, and pressure adjustment. The parking brake spring 22 and the service brake spring 32 use springs to push the parking brake piston 21 and the service brake piston 31 to move inward, respectively.

[0034] When the hydraulic system is pressurized via the parking brake oil passage 13 and the service brake oil passage 14, it can compress the parking brake spring 22 and the service brake spring 32 respectively, pushing the parking brake piston 21 and the service brake piston 31 outward. When the pressure is released, the parking brake spring 22 and the service brake spring 32 push the parking brake piston 21 and the service brake piston 31 inward. Furthermore, the thrust of the parking brake spring 22 is greater than the thrust of the service brake spring 32, which can push the service brake piston 31 outward.

[0035] Specifically, during service braking: The hydraulic system pressurizes the parking brake oil passage 13, pushing the parking brake piston 21 outward, causing the parking brake piston 21 to disengage from the service brake piston 31. At the same time, the hydraulic system adjusts the pressure through the service brake oil passage 14, causing the service brake piston 31 to compress the brake in a controlled manner, providing appropriate braking force to the drive shaft 41 through the friction pad 42, thereby achieving service braking.

[0036] When the parking brake is applied: The hydraulic system releases pressure through the parking brake oil passage 13 and the service brake oil passage 14. The parking brake spring 22 pushes the parking brake piston 21 inward. Since the thrust of the parking brake spring 22 is greater than the thrust of the service brake spring 32, it further pushes the service brake piston 31 to squeeze the brake, providing braking force to the drive shaft 41 through the friction pad 42, thus realizing the parking brake.

[0037] The above are merely embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A driving and parking integrated brake structure, characterized in that: The device includes a piston housing, a brake housing, a parking brake piston, a service brake piston, a parking brake spring, a service brake spring, and a brake. The parking brake piston is located on one side of the piston housing, and the service brake piston, the brake, and the brake housing are sequentially located on the other side. A transmission component is located inside the parking brake piston or the service brake piston, passing through the piston housing and abutting against another piston. The piston housing has a parking brake oil passage and a service brake oil passage, which extend to the inside of the parking brake piston and the service brake piston, respectively. The parking brake spring and the service brake spring are located outside the parking brake piston and the service brake piston, respectively.

2. The integrated driving and parking brake structure according to claim 1, characterized in that: The piston housing is provided with a limiting bolt that passes through the service brake piston, and the service brake spring is provided between the outer end of the limiting bolt and the service brake piston.

3. The integrated driving and parking brake structure according to claim 2, characterized in that: The vehicle brake spring is a disc spring assembly, with multiple disc springs sleeved around the limiting bolt.

4. The integrated driving and parking brake structure according to claim 1, characterized in that: The piston housing has a limiting member located outside the parking brake piston, and the parking brake spring is provided between the limiting member and the parking brake piston on the inner side of the limiting member.

5. The integrated driving and parking brake structure according to claim 4, characterized in that: The parking brake spring is a disc spring assembly, with multiple disc springs located inside the piston housing.

6. The integrated driving and parking brake structure according to claim 1, characterized in that: The parking brake piston, the service brake piston, and the transmission component are each provided with one or more sealing elements between themselves and the piston housing. The sealing elements are distributed on the inner and outer sides of the parking brake oil passage and on the inner and outer sides of the service brake oil passage.

7. The integrated driving and parking brake structure according to claim 6, characterized in that: Some or all of the sealing elements are Y-type sealing elements, including a sealing ring and a retaining ring with Y-shaped and square cross-sections respectively arranged side by side. The sealing ring is located on the side closer to the oil passage, and the retaining ring is located on the side away from the oil passage. The open end of the sealing ring faces the direction of the oil passage.

8. The integrated driving and parking brake structure according to claim 1, characterized in that: The drive shaft passes sequentially through the parking brake piston, the transmission component, and the service brake piston, connects to the brake, and then passes through the brake housing.

9. The integrated driving and parking brake structure according to claim 1, characterized in that: The parking brake oil passage and the service brake oil passage are pressurized, pushing the parking brake piston and the service brake piston outward. The parking brake spring and the service brake spring respectively push the parking brake piston and the service brake piston inward. The oil pressure thrust of the parking brake oil passage is greater than the thrust of the parking brake spring, the oil pressure thrust of the service brake oil passage is greater than the thrust of the service brake spring, and the thrust of the parking brake spring is greater than the thrust of the service brake spring.

10. The integrated driving and parking brake structure according to claim 9, characterized in that: When the vehicle is braking, the parking brake oil passage is pressurized, which pushes the parking brake piston outward and presses the parking brake spring. The service brake oil passage is pressurized to counteract the service brake spring and control the service brake piston to squeeze the brake, thereby achieving service braking. When the parking brake is applied, both the parking brake oil passage and the service brake oil passage are depressurized. The parking brake spring pushes the parking brake piston inward, and the parking brake piston pushes the service brake piston to squeeze the brake via the transmission component, thereby achieving parking brake application.

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