oil pressure parking drum brake

Abstract

The application relates to an oil pressure parking drum brake, which comprises a base, a brake assembly, a parking pull wire and an oil cylinder, the parking pull wire and the oil cylinder can respectively drive the brake assembly to realize braking. As a further improvement of the above technical scheme: the brake assembly comprises a rocker arm, a middle section of the rocker arm is hingedly connected to the base, one end of the rocker arm is driven by a hand brake driving part, the other end of the rocker arm is driven by a hydraulic brake driving part, a lever is driven by the rocker arm, and a shoe is installed on the side of the base away from the rocker arm, the shoe is pushed by the lever. The application combines the hand brake and the hydraulic brake, improves the brake performance, and can avoid the safety hidden danger that a vehicle slips on a slope due to the increase of the self weight.

Description

Technical Field

[0001] This application relates to the field of vehicle engineering control technology, and in particular to a hydraulic parking drum brake. Background Technology

[0002] With social development, improved living standards, and applications in various scenarios, electric tricycles have become an indispensable means of transportation for people.

[0003] Currently, tricycles are getting bigger and heavier. Most of the brake structures commonly used on the market are traditional cable brakes, which are crudely made and not easy to operate. There is no hydraulic drum brake with parking function on the market that can meet the requirements of both parking and ensuring braking distance. Utility Model Content

[0004] In response to the shortcomings of the existing production technology, the applicant provides a hydraulic parking drum brake with a reasonable structure, which improves braking performance and can avoid safety hazards such as vehicle rolling backwards due to increased vehicle weight.

[0005] The technical solution adopted in this application is as follows:

[0006] A hydraulic parking drum brake includes a base, a braking assembly, a parking cable, and a hydraulic cylinder mounted on the base. The parking cable and the hydraulic cylinder can respectively drive the braking assembly to achieve braking.

[0007] As a further improvement to the above technical solution:

[0008] The braking assembly includes:

[0009] The rocker arm is hinged to the base in the middle. One end of the rocker arm is partially driven by the handbrake, and the other end is partially driven by the hydraulic brake.

[0010] The lever is driven by the rocker arm.

[0011] The hoof block is mounted on the side of the base away from the rocker arm, and the hoof block is pushed by a lever.

[0012] The rocker arm is constantly connected to the part near the handbrake.

[0013] The end of the rocker arm closest to the hydraulic cylinder is only subjected to the thrust of the hydraulic cylinder.

[0014] The thrust exerted by the hydraulic cylinder and the parking cable on the rocker arm is in opposite directions.

[0015] The rocker arm has a notch at one end near the oil cylinder, through which the piston rod of the oil cylinder passes; and the piston rod of the oil cylinder is provided with a push shaft that abuts against the rocker arm, with the push shaft located on the side of the rocker arm facing the oil cylinder.

[0016] The rocker arm is bent at one end near the oil cylinder, and the concave structure formed by the bend supports the push shaft.

[0017] The base includes a bridge tube and a housing located at one end of the bridge tube, and the hydraulic cylinder is mounted on the bridge tube.

[0018] The hydraulic cylinder, rocker arm, and parking cable are located on the side of the housing facing the axle tube, with the hydraulic cylinder and parking cable situated on opposite sides radially above the axle tube.

[0019] The shoe block is located on the side of the housing away from the bridge tube.

[0020] A return spring is connected between the shoe blocks.

[0021] The lever is held between the shoe blocks; at least one return spring is located on one of the shoe blocks near the lever.

[0022] The beneficial effects of this application are as follows:

[0023] Through long-term structural design analysis and real vehicle road testing, this application has a certain foundation for technical implementation and demonstration. Furthermore, through comparison, it has been found that this application has four major technical advantages compared with other adjustment structures: practicality, operational flexibility, reliability, and low cost.

[0024] In terms of practicality, this application is designed based on the company's existing sales models, and optimizes the large braking force caused by the cable-driven drum brake control method, filling the technical gap of independent parking function of drum brake.

[0025] In terms of flexibility, this application is simple to operate, lightweight and effortless, and easy for the elderly to use. Based on the need for after-sales maintenance and easy assembly, each component is independently designed without modifying other parts of the vehicle, allowing for individual component adjustments.

[0026] In terms of reliability, this application is an upgrade based on traditional drum brakes, featuring a simple structure with core components made of aluminum alloy. The design scheme has undergone extensive theoretical and design analysis, with multiple versions developed initially. Through repeated structural analysis and detailed optimization adjustments, the current relatively mature structure has been finalized. This structure has already undergone small-batch trial installation and testing, proving to be simple to operate and highly practical for drivers.

[0027] Regarding after-sales costs, each component of this application is independently designed and used separately, which will not cause inconvenience during after-sales maintenance. Furthermore, since the components of this structure are used separately, they are easy to assemble and more convenient for after-sales service. Attached Figure Description

[0028] Figure 1 This is a perspective view of the drum brake structure of this application.

[0029] Figure 2 This is a perspective view of the drum brake structure of this application from another angle.

[0030] Figure 3 This is a perspective view of the drum brake structure of this application from another angle.

[0031] The components include: 1. base; 2. braking assembly; 3. parking cable; 4. hydraulic cylinder;

[0032] 101. Bridge tube; 102. Housing;

[0033] 201. Rocker arm; 202. Lever; 203. Shoe block; 204. Return spring; 205. Shaft;

[0034] 2011, Gap;

[0035] 401. Drive shaft. Detailed Implementation

[0036] The specific embodiments of this application are described below with reference to the accompanying drawings.

[0037] like Figures 1-3 As shown, the hydraulic parking drum brake of this embodiment includes a base 1, a braking assembly 2, a parking cable 3 and a hydraulic cylinder 4 on the base 1, and the parking cable 3 and the hydraulic cylinder 4 can respectively drive the braking assembly 2 to achieve braking.

[0038] Braking assembly 2 includes:

[0039] The rocker arm 201 is hinged to the base 1 in the middle. One end of the rocker arm 201 is partially driven by a handbrake, and the other end is partially driven by a hydraulic brake.

[0040] The lever 202 is driven by the rocker arm 201.

[0041] The shoe block 203 is installed on the side of the base 1 away from the rocker arm 201, and the shoe block 203 is pushed by the lever 202.

[0042] The rocker arm 201 is always connected to the part that is close to the handbrake.

[0043] The end of the rocker arm 201 closest to the hydraulic cylinder 4 is only subjected to the thrust of the hydraulic cylinder 4.

[0044] The thrust exerted by the hydraulic cylinder 4 and the parking cable 3 on the rocker arm 201 is in opposite directions.

[0045] The rocker arm 201 has a notch 2011 at one end near the oil cylinder 4, through which the piston rod of the oil cylinder 4 passes; and the piston rod of the oil cylinder 4 has a push shaft 401 that abuts against the rocker arm 201, with the push shaft 401 located on the side of the rocker arm 201 facing the oil cylinder 4.

[0046] The rocker arm 201 is bent at one end near the oil cylinder 4, and the concave structure formed by the bend supports the push shaft 401.

[0047] The base 1 includes a bridge tube 101, a housing 102 located at one end of the bridge tube 101, and a hydraulic cylinder 4 mounted on the bridge tube 101.

[0048] The hydraulic cylinder 4, rocker arm 201, and parking cable 3 are located on the side of the housing 102 facing the axle tube 101, and the hydraulic cylinder 4 and parking cable 3 are located on both sides radially on the axle tube 101.

[0049] The shoe block 203 is located on the side of the housing 102 away from the bridge tube 101.

[0050] A return spring 204 is connected between the shoe blocks 203.

[0051] The lever 202 is clamped between the shoe blocks 203; at least one return spring 204 is provided on the shoe block 203 near the lever 202.

[0052] The specific structure and working principle of this application are as follows:

[0053] like Figures 1-3 As shown, the drum brake of this application has two braking power sources: the parking cable 3 and the hydraulic cylinder 4. Furthermore, its advantage lies in the fact that when the rocker arm is pulled solely using the parking cable 3, the rocker arm does not exert pressure or thrust on the hydraulic cylinder 4.

[0054] Hydraulic cylinder 4 is bolted to bridge tube 101. A push shaft 401 is mounted on the piston rod of hydraulic cylinder 4. When the piston rod extends, it pushes rocker arm 201, which in turn drives lever 202 on the other side of housing 102. Lever 202, located between two brake shoes 203, rotates, causing the brake shoes 203 to rotate around shaft 205; at this time, the brake shoes 203 apply brakes. When the braking force is released, the brake shoes 203 return to their original position via return spring 204.

[0055] The handbrake braking process is as follows: the handbrake cable drives the rocker arm 201 through the parking cable 3 system. The rocker arm 201 has a notch 2011 at the rear end to prevent it from driving the hydraulic cylinder 4. The rocker arm 201 continues to rotate, pushing the shoe block 203 to brake.

[0056] In this embodiment, the lever 202 is drum-shaped, which can push the shoe block 203 while the two arc-shaped surfaces of the drum can also adapt to the swinging motion of the rocker arm in two different directions. The swinging motion of the rocker arm in any direction can drive the lever 202 to push the shoe block 203.

[0057] The key design feature of this application lies in the adoption of a hydraulic braking principle, which enhances braking performance and improves operational flexibility. Specifically, this is achieved by adding a hydraulic cylinder 4 and a brake push shaft 401, transforming the traditional cable-controlled drum brake process into a hydraulic pump-controlled braking process, thus improving braking performance, ease of operation, and sensitivity. Through the parking cable 3 system, a separate layout can be used to connect the handbrake for parking. This significantly improves stability, reliability, and safety, while also making the operation easier.

[0058] The above description is an explanation of this application and not a limitation thereof. The scope of this application is defined by the claims. Within the scope of protection of this application, any form of modification may be made.

Claims

1. A hydraulic parking drum brake, characterized in that: The system includes a base (1), on which a braking assembly (2), a parking cable (3), and a hydraulic cylinder (4) are mounted. The parking cable (3) and the hydraulic cylinder (4) can respectively drive the braking assembly (2) to achieve braking. The braking assembly (2) includes a rocker arm (201), the rear end of which is designed with a notch (2011) to prevent the hydraulic cylinder (4) from being driven.

2. The hydraulic parking drum brake as described in claim 1, characterized in that: The braking assembly (2) includes: The rocker arm (201) is hinged to the base (1) in the middle. One end of the rocker arm (201) is partially driven by the handbrake, and the other end is partially driven by the hydraulic brake. The lever (202) is driven by the rocker arm (201). A shoe block (203) is mounted on the side of the base (1) away from the rocker arm (201), and the shoe block (203) is pushed by a lever (202).

3. The hydraulic parking drum brake as described in claim 2, characterized in that: The rocker arm (201) near the handbrake actuation part is always connected to the rocker arm (201).

4. The hydraulic parking drum brake as described in claim 2, characterized in that: The rocker arm (201) is located at the end near the oil cylinder (4) and is only subjected to the thrust of the oil cylinder (4).

5. The hydraulic parking drum brake as described in claim 4, characterized in that: The thrust exerted by the hydraulic cylinder (4) and the parking cable (3) on the rocker arm (201) is in opposite directions.

6. The hydraulic parking drum brake as described in claim 5, characterized in that: The rocker arm (201) has a notch (2011) at one end near the oil cylinder (4), through which the piston rod of the oil cylinder (4) passes; and the piston rod of the oil cylinder (4) has a push shaft (401) that abuts against the rocker arm (201), with the push shaft (401) located on the side of the rocker arm (201) facing the oil cylinder (4).

7. The hydraulic parking drum brake as described in claim 6, characterized in that: The rocker arm (201) is bent at one end near the oil cylinder (4), and the concave structure formed by the bend supports the push shaft (401).

8. The hydraulic parking drum brake as described in claim 1, characterized in that: The base (1) includes a bridge tube (101) and a housing (102) located at one end of the bridge tube (101). The hydraulic cylinder (4) is mounted on the bridge tube (101). The hydraulic cylinder (4), rocker arm (201), and parking cable (3) are located on the side of the housing (102) facing the axle tube (101), and the hydraulic cylinder (4) and parking cable (3) are located on opposite sides of the axle tube (101) in the radial direction. The shoe block (203) is located on the side of the housing (102) away from the bridge tube (101).

9. The hydraulic parking drum brake as described in claim 2, characterized in that: A return spring (204) is connected between the shoe blocks (203).

10. The hydraulic parking drum brake as described in claim 8, characterized in that: The lever (202) is held between the shoe blocks (203); at least one return spring (204) is provided on the shoe block (203) near the lever (202).

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