Brake hydraulic component assembly

Abstract

The utility model belongs to the field of engineering vehicles, and provides a brake hydraulic component assembly which comprises a hydraulic shell, a push rod, a parking piston, a driving piston and a spring set, and the parking piston and the driving piston are arranged in a parking oil cavity and a driving oil cavity respectively. The hydraulic shell is provided with a parking oil inlet and a driving oil inlet which are communicated with the parking oil cavity and the driving oil cavity respectively, the hydraulic shell is provided with a first bolt used for connecting the hydraulic shell with the axle shell, the parking piston is nested with the spring set, and the axial projection plane of the parking piston is not smaller than the elastic action end face of the spring set. A conical groove is formed in the end, facing the push rod, of the parking piston, and the parking piston is movably matched with a hollow circular truncated cone arranged in the parking oil cavity in an embedded mode. The device is reasonable in design, simple in structure, capable of being externally arranged on the axle housing, high in oil inlet and outlet efficiency, good in braking performance and suitable for large-scale popularization.

Description

Technical Field

[0001] This utility model belongs to the field of engineering vehicles, and in particular relates to a brake hydraulic component assembly. Background Technology

[0002] Typical multi-disc wet brakes employ a non-independent hydraulic component design, essentially entirely enclosed within the drive axle housing. During braking, hydraulic pressure pushes a piston, which in turn presses against the moving and stationary friction pads, generating frictional torque to brake the vehicle. When the hydraulic oil in the piston chamber is depressurized, a return spring resets the piston, separating the moving and stationary friction pads, eliminating the frictional torque, and releasing the vehicle from the brakes. Because this hydraulic component is a non-independent structure, almost entirely integrated within the drive axle, any quality issues with easily worn brake chambers, seals, or piston components necessitate disassembling the entire drive axle around the affected area. This results in a large workload, long lead times, hindering rapid repairs, and high maintenance costs. Furthermore, the large structural dimensions make machining difficult, and installation and debugging are complex.

[0003] Existing patent CN201620372885.2 discloses a hydraulic brake cylinder, which has a cylinder body. The cylinder body cavity is provided with an active rod, a disc spring, a parking piston, and a brake piston. The brake piston is located in front of the parking piston. The rear end of the push rod is connected to the brake piston, and the front end of the push rod is connected to a pin. The disc spring is sleeved on the outside of the active rod, and the front end of the disc spring is connected to the rear end of the parking piston. The parking piston has a convex structure. There is a gap between the front end of the active rod and the front end of the parking piston. The cylinder body is also provided with a first oil hole and a second oil hole. The first oil hole communicates with the inner cavity between the parking piston and the radial side wall of the inner cavity. The second oil hole communicates with the inner cavity between the parking piston and the brake piston. However, the device lacks a connection structure that can be externally mounted on the axle housing. Furthermore, the design of the hydraulic action surfaces of the parking piston and brake piston of the hydraulic brake cylinder needs improvement. For example, the current design directly affects the efficiency of oil inlet pressurization, thereby affecting the hydraulic braking performance of the device. Secondly, the contact surface between the spring and the parking piston may slip or become embedded, affecting the interaction between the spring and the parking piston. Utility Model Content

[0004] This utility model addresses the technical problems existing in the aforementioned hydraulic brake cylinders by proposing a brake hydraulic assembly that is reasonably designed, has a simple structure, can be externally mounted on the axle housing, has high oil inlet and outlet efficiency, and good braking performance.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a brake hydraulic assembly, including a hydraulic housing. A push rod is provided at the telescopic end of the hydraulic housing. A parking piston and a traveling piston that cooperates with one end of the push rod are disposed inside the hydraulic housing. A spring assembly is provided on the side of the parking piston away from the traveling piston. The parking piston and the traveling piston are respectively disposed in a parking oil chamber and a traveling oil chamber. The hydraulic housing is provided with a parking oil inlet and a traveling oil inlet that communicate with the parking oil chamber and the traveling oil chamber respectively. A first bolt for connecting it to the axle housing is provided on the hydraulic housing. The parking piston and the spring assembly are nested together, and the axial projection surface of the parking piston is not smaller than the elastic end face of the spring assembly. A tapered groove is provided at the end of the parking piston facing the push rod. The parking piston and a hollow frustum disposed in the parking oil chamber are in a movable nested fit.

[0006] Preferably, the traveling piston has a T-shaped structure with its head facing the direction of the push rod's movement, and the oil inlet path of the traveling piston is directed towards the rear side of the head of the traveling piston.

[0007] Preferably, the rear end of the traveling piston is movably nested with the hollow frustum, and the rear end of the traveling piston is provided with a threaded push rod, which engages with a central countersunk hole at the end of the parking piston. The threaded push rod is used to adjust the axial position of the push rod.

[0008] Preferably, the parking piston has a cross-shaped structure and includes a first cylindrical section, a second cylindrical section, and a third cylindrical section. The first cylindrical section is nested with a spring assembly and engages with a rear groove in the hydraulic housing. The second cylindrical section is in a movable sealing engagement with the parking oil chamber. The third cylindrical section is in a movable sealing engagement with the center of the hollow truncated cone.

[0009] Preferably, the parking piston and the inner wall of the parking oil chamber, the parking piston and the inner wall of the hollow truncated cone, and the driving piston and the inner wall of the driving oil chamber are all provided with at least one sealing element.

[0010] Preferably, the hydraulic housing includes a traveling housing, a parking housing, and a spring housing nested sequentially. The first bolt connects the traveling housing and the axle housing, and the edges of the spring housing, the parking housing, and the traveling housing are synchronously connected by a second bolt.

[0011] Preferably, the driving piston has a stepped pressure port inside, and the push rod includes a brake head, a main rod body, and a contact head distributed sequentially from front to back.

[0012] Preferably, the end face edge of the contact head has a rounded transition.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0014] This utility model provides a brake hydraulic assembly. A first bolt is installed by creating bolt connection holes in the hydraulic housing. The first bolt then assembles the hydraulic housing and its internal structure onto the vehicle's axle housing, thus externalizing the hydraulic power for easy maintenance. The parking piston and spring assembly have ample contact surface, and a hollow frustum is designed in the parking oil chamber to cooperate with the parking piston, effectively improving the efficiency of oil inlet and pressurization. This device is rationally designed, simple in structure, can be externally mounted on the axle housing, has high oil inlet and outlet efficiency, and good braking performance, making it suitable for large-scale promotion. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of a brake hydraulic assembly provided in this embodiment;

[0017] Figure 2 for Figure 1 Enlarged schematic diagram of structure A in the middle;

[0018] Figure 3 An external mounting diagram of a brake hydraulic assembly on an axle housing is provided for an embodiment.

[0019] Figure 4 A schematic diagram of the parking piston provided in the embodiment;

[0020] Figure 5 A schematic diagram of the push rod provided for the embodiment;

[0021] In the above figures:

[0022] 1. Spring assembly; 2. Hydraulic housing; 21. Parking oil chamber; 22. Traveling oil chamber; 23. Parking oil inlet; 24. Traveling oil inlet; 25. Hollow truncated cone; 26. Traveling housing; 27. Parking housing; 28. Spring housing; 3. Push rod; 31. Brake head; 32. Main rod body; 33. Contact head; 4. Parking piston; 41. Conical groove; 42. First cylindrical section; 43. Second cylindrical section; 44. Third cylindrical section; 5. Traveling piston; 51. Stepped top pressure port; 6. First bolt; 7. Second bolt; 8. Threaded push rod; 9. Seal; 10. Bridge housing; 11. Friction plate assembly. Detailed Implementation

[0023] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. For ease of description, the terms "upper," "lower," "left," and "right" appearing below only indicate that they correspond to the upper, lower, left, and right directions in the accompanying drawings and do not limit the structure.

[0024] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0025] Examples, such as Figures 1-5 As shown, the present invention provides a brake hydraulic assembly, including a hydraulic housing 2. A push rod 3 is provided at the telescopic end of the hydraulic housing 2. A parking piston 4 and a traveling piston 5 that cooperates with one end of the push rod 3 are provided inside the hydraulic housing 2. A spring assembly 1 is provided on the side of the parking piston 4 away from the traveling piston 5. The parking piston 4 and the traveling piston 5 are respectively located in the parking oil chamber 21 and the traveling oil chamber 22. The hydraulic housing 2 is provided with a parking oil inlet 23 and a traveling oil inlet 24 that communicate with the parking oil chamber 21 and the traveling oil chamber 22, respectively. A first bolt 6 is provided on the hydraulic housing 2 for connecting it to the axle housing 10. The parking piston 4 and the spring assembly 1 are nested together, and the axial projection surface of the parking piston 4 is not smaller than the elastic end face of the spring assembly 1. A tapered groove 41 is provided at the end of the parking piston 4 facing the push rod 3. The parking piston 4 and the hollow frustum 25 located in the parking oil chamber 21 are in a movable nested cooperation.

[0026] Specifically, the first bolt 6 is installed by opening bolt connection holes in the hydraulic housing 2. The first bolt 6 assembles the hydraulic housing 2 and its internal structure together onto the axle housing 10 of the vehicle, thereby realizing external hydraulic power. This effectively solves the problems of difficult maintenance, large structural size, and high manufacturing cost of built-in brake hydraulic components. It also integrates the functions of service braking and parking braking, making it more adaptable to various working conditions.

[0027] The pre-compression force of spring assembly 1 pushes the parking piston 4, the traveling piston 5, and the push rod 3, allowing the push rod 3 to achieve pre-extension force, but without directly generating a braking effect. Both the parking inlet 23 and the traveling inlet 24 are connected to the hydraulic oil source. When hydraulic oil enters the parking oil inlet 23 and enters the parking oil chamber 21, it can squeeze the parking piston 4 towards the spring assembly 1, causing the spring assembly 1 to compress. The push rod 3, under the squeezing action of the friction plate assembly 11 within the axle housing 10, moves towards the parking piston 4, releasing the brake. The drive shaft at the center of the friction plate assembly 11 can then complete the full power output. Regarding the braking process, when the parking oil inlet 23 returns to its original position and the traveling oil inlet 24 enters, hydraulic oil enters the traveling oil chamber 22, moving the traveling piston 5 along with the push rod 3 towards the friction plate assembly 11 within the axle housing 10. This transmits the hydraulic radial force to the friction plate assembly 11, causing the friction plate assembly 11 to separate and achieve the traveling brake. Furthermore, the parking piston 4 and the spring assembly 1 have sufficient contact surfaces, and a hollow frustum 25 is designed in the parking oil chamber 21 to cooperate with the conical groove 41 of the parking piston 4. The oil inlet path of the parking oil inlet 23 can effectively act on the head of the parking piston 4, which can effectively improve the efficiency of oil inlet pressurization, thereby improving the hydraulic braking performance.

[0028] To improve the efficiency of oil intake for service braking, the service piston 5 provided by this invention has a T-shaped structure with its head facing the direction of movement of the push rod 3, and the oil intake path of the service oil inlet 24 faces the rear side of the head of the service piston 5. In this way, the oil intake path for service braking can effectively and fully act on the rear side of the head of the service piston 5, ensuring the immediacy of oil intake and thus improving service braking efficiency.

[0029] To improve the axial movement performance of the traveling piston 5, the rear end of the traveling piston 5 provided by this utility model is movably nested with the hollow frustum 25, thereby ensuring the axial straightness of the traveling piston 5. Furthermore, this utility model also provides a threaded push rod 8 at the rear end of the traveling piston 5. The threaded push rod 8 cooperates with the central countersunk hole provided at the end of the parking piston 4. The central countersunk hole provides sufficient rear space for the threaded push rod 8, and the threaded push rod 8 is used to adjust the axial position of the push rod 3. By rotating the threaded push rod 8, its actual contact position with the push rod 3 can be controlled, thereby changing the extension performance of the push rod 3.

[0030] To improve the working performance of the parking piston 4, the parking piston 4 provided by this utility model has a cross structure and includes a first cylindrical section 42, a second cylindrical section 43, and a third cylindrical section 44. The first cylindrical section 42 is nested with the spring assembly 1 and cooperates with the rear groove of the hydraulic housing 2. The second cylindrical section 43 is in a movable sealing cooperation with the parking oil chamber 21. The conical groove 41 is set at the front end of the third cylindrical section 44, and the third cylindrical section 44 is in a movable sealing cooperation with the center of the hollow frustum 25. Among them, the second cylindrical section 43 is in direct contact with the elastic working surface of the spring assembly 1, and its axial projection surface covers the working surface of the spring assembly 1, so as to avoid the spring assembly 1 from slipping off the parking piston 4; the cooperation between the first cylindrical section 42 and the rear groove can ensure the straightness of the axial displacement of the parking piston 4.

[0031] To ensure the sealing of the parking oil chamber 21 and the driving oil chamber 22, this utility model provides at least one sealing element in the inner wall of the parking piston 4 and the parking oil chamber 21, the inner wall of the parking piston 4 and the hollow truncated cone 25, and the inner wall of the driving piston 5 and the driving oil chamber 22. In particular, three sealing elements are provided between the head section of the driving piston 5 and the driving oil chamber 22 to effectively prevent hydraulic oil from leaking into the axle housing 10.

[0032] To facilitate assembly and maintenance, the hydraulic housing 2 provided by this utility model adopts a three-section nested design, specifically including a traveling housing 26, a parking housing 27, and a spring housing 28 nested sequentially. A first bolt 6 connects the traveling housing 26 to the axle housing 10. The edges of the spring housing 28, parking housing 27, and traveling housing 26 are synchronously connected by a second bolt. Bolt holes for installing the first bolt 6 are provided on the parking housing 27 and traveling housing 26, staggered with the positions of the second bolts. The nested surfaces of the spring housing 28, parking housing 27, and traveling housing 26 are tightly fitted to achieve a seal. With the connection of the second bolts, a complete hydraulic housing is formed. Furthermore, internal components in specific locations can be repaired by removing the corresponding housing. From a spatial perspective, the hydraulic housing 2 has a compact and ingenious design, can be independently assembled and disassembled for maintenance, and can be externally mounted on the vehicle's axle housing 10.

[0033] To improve the cooperation performance between the traveling piston 5 and the push rod 3, the traveling piston 5 provided by this utility model has a stepped pressure port 51 inside. The push rod 3 includes a brake head 31, a main rod body 32, and a contact head 33 distributed sequentially from front to back. The contact head 33 makes active contact with the stepped pressure port 51. Furthermore, the end face edge of the contact head 33 has a rounded transition. The push rod 3 and the traveling piston 5 adopt a split structure design. The outer spherical surface of the push rod 3 head matches the inner spherical surface of the traveling piston 5. The end of the stepped pressure port 51 has a flared design. The flared shape allows the push rod 3 to have swing space, and the push rod 3 can swing ±2° around the center of the inner spherical surface of the traveling piston 5, thereby better cooperating with the friction plate assembly 11 and converting the hydraulic radial force into the axial force of the friction plate assembly. The slight tilt of the push rod 3 angle can adapt to the floating within a certain range 'a' of the installation position of the pressing contact part.

[0034] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A brake hydraulic assembly, comprising a hydraulic housing, a push rod disposed at the telescopic end of the hydraulic housing, a parking piston and a traveling piston cooperating with one end of the push rod disposed inside the hydraulic housing, a spring assembly disposed on the side of the parking piston away from the traveling piston, the parking piston and the traveling piston being disposed in a parking oil chamber and a traveling oil chamber respectively, and the hydraulic housing being provided with a parking oil inlet and a traveling oil inlet communicating with the parking oil chamber and the traveling oil chamber respectively, characterized in that, The hydraulic housing is provided with a first bolt for connecting it to the axle housing. The parking piston is nested with the spring assembly, and the axial projection surface of the parking piston is not smaller than the elastic end face of the spring assembly. The parking piston is provided with a tapered groove at one end facing the push rod. The parking piston and the hollow frustum provided in the parking oil chamber are in a movable nested fit.

2. A brake hydraulic assembly according to claim 1, wherein, The traveling piston has a T-shaped structure with its head facing the direction of the push rod's movement, and the oil inlet of the traveling piston has its oil path facing the rear side of the head of the traveling piston.

3. A brake hydraulic assembly according to claim 1 or 2, wherein, The rear end of the traveling piston is movably nested with the hollow truncated cone. The rear end of the traveling piston is provided with a threaded push rod, which engages with a central countersunk hole at the end of the parking piston. The threaded push rod is used to adjust the axial position of the push rod.

4. The brake hydraulic assembly of claim 1, wherein, The parking piston has a cross-shaped structure and includes a first cylindrical section, a second cylindrical section and a third cylindrical section. The first cylindrical section is nested with a spring assembly and cooperates with a rear groove opened in the hydraulic housing. The second cylindrical section is in movable sealing cooperation with the parking oil chamber. The third cylindrical section is in movable sealing cooperation with the center of the hollow truncated cone.

5. A brake hydraulic assembly according to claim 1, characterized in that, The parking piston and the inner wall of the parking oil chamber, the parking piston and the inner wall of the hollow truncated cone, and the driving piston and the inner wall of the driving oil chamber are all provided with at least one seal.

6. A brake hydraulic assembly according to claim 1, wherein, The hydraulic housing includes a traveling housing, a parking housing, and a spring housing nested sequentially. The first bolt connects the traveling housing to the axle housing, and the edges of the spring housing, the parking housing, and the traveling housing are synchronously connected by a second bolt.

7. The brake hydraulic assembly of claim 1, wherein, The piston has a stepped pressure port inside, and the push rod includes a brake head, a main rod body and a contact head distributed in sequence from front to back.

8. A brake hydraulic assembly according to claim 7, characterized in that, The end face edge of the contact head has a rounded transition.

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