Hydraulic brake caliper for electronic parking

Abstract

A hydraulic brake caliper for electronic parking brake, including C-shaped caliper support and the outer friction piece that is arranged in the inside of one end of caliper support, the inside of the other end of caliper support is provided with square sliding cavity, the outer end of brake caliper piston is fixed with the inner friction piece opposite to outer friction piece, brake caliper piston inside is fixed with the compression nut, the drive screw that is engaged with the compression nut is penetrated, the outer end side wall of brake caliper piston is fixed with piston dust cover, one end of piston dust cover is sleeved in the fixed groove of brake caliper piston outside wall, the other end of piston dust cover is sleeved in the fixed groove of the outer end caliper support of sliding cavity, and the middle part of piston dust cover is provided with the bending elastic expansion fold structure.The multilayer sealing structure of the utility model is not only effective in reducing brake noise, but also can guarantee the sealing of brake piston, avoid sundries into the site to cause the jam of brake main, guarantee the reliability and safety of brake.

Description

Technical Field

[0001] This utility model relates to the field of brake caliper technology, specifically a hydraulic brake caliper for electronic parking brakes. Background Technology

[0002] The electronic parking brake (EPB) market is currently experiencing sustained high-speed growth. This growth is primarily driven by the electrification and intelligent transformation of the automotive industry, as well as the increasing demand from the consumer market for advanced driver assistance systems (ADAS). Traditional parking brake systems suffer from technological bottlenecks, high braking noise, and poorly designed brake piston sealing structures, which can easily lead to jamming. Utility Model Content

[0003] To address the aforementioned problems, the purpose of this invention is to provide a hydraulic brake caliper for electronic parking brakes.

[0004] To achieve the above objectives, the technical solution of this utility model is as follows: a hydraulic brake caliper for electronic parking brake, comprising a C-shaped caliper bracket and an outer friction plate disposed on the inner side of one end of the caliper bracket. A square sliding cavity is provided inside the other end of the caliper bracket, and a brake caliper piston is slidably disposed in the sliding cavity. An inner friction plate opposite to the outer friction plate is fixed to the outer end of the brake caliper piston. A clamping nut is fixed inside the brake caliper piston, and a drive screw meshing with the clamping nut passes through the clamping nut. The other end of the drive screw passes through the caliper bracket and is fixedly connected to the motor shaft of the MGU motor. A piston dust cover is fixed to the outer side wall of the brake caliper piston. One end of the piston dust cover is fitted into a fixing groove on the outer side wall of the brake caliper piston, and the other end of the piston dust cover is fitted into a fixing groove provided on the outer end of the sliding cavity caliper bracket. A bent elastic telescopic pleated structure is provided in the middle part of the piston dust cover.

[0005] Furthermore, a square sealing ring is fitted on the brake caliper piston inside the piston dust cover.

[0006] Furthermore, a thrust needle roller bearing is fitted onto one end of the drive screw that passes through the caliper bracket.

[0007] Furthermore, an inner sealing ring is fitted around the drive screw outside the thrust needle roller bearing.

[0008] Furthermore, the drive screw on the outside of the inner seal ring is fitted with a bushing.

[0009] Furthermore, the drive screw on the outer side of the bushing has an open retaining ring, and the outer side of the open retaining ring is opposite to the MGU motor.

[0010] This invention was developed using a benchmark reverse engineering approach. Currently, the overall configuration design verification and component technical status freeze have been completed, and the supply chain system has initiated functional prototype manufacturing. In the selection of core components, the electromechanical actuation unit (MGU) uses a domestically produced high-precision geared motor module. The drive screw and clamping nut utilize mature engineering structural solutions to ensure transmission reliability. The caliper body, bracket structure, and sealing structure are independently designed and manufactured, and an environmentally friendly zinc-based surface treatment process is applied to improve corrosion resistance. The friction pad assembly is jointly developed with a domestic professional supplier possessing full-condition testing capabilities, optimizing its anti-rust adhesion characteristics, linear wear rate, interlaminar shear strength, and NVH (noise, vibration, and harshness) performance indicators. This invention, through an innovative model combining forward development and reverse engineering, forms a braking solution that complies with the EPB functional safety standard (ISO 26262), laying a technical foundation for subsequent large-scale vehicle verification and market promotion.

[0011] With the above settings, this utility model has the following advantages. 1. The key dimensions of the clamp body, such as the guide pin hole spacing and the piston return groove depth, are optimized and iterated to achieve low drag of 1.5Nm, thereby reducing fuel consumption; 2. Adjust the structure and size of the friction pad alarm plate based on finite element topology analysis to improve the friction pad wear alarm performance; 3. Based on topology optimization and multibody dynamics simulation, the friction pad structure is optimized. Combined with the brake noise bench test, the friction pad formula and structure are adapted and adjusted. In particular, the multi-layer sealing structure not only effectively reduces brake noise, but also ensures the sealing of the brake piston, preventing foreign objects from entering the part and causing jamming, thus ensuring the reliability and safety of braking. Attached Figure Description

[0012] The present invention will now be further described with reference to the accompanying drawings.

[0013] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a top view of the structure of this utility model; Figure 3 for Figure 1 A schematic diagram of the AA-plane cross-sectional structure. Detailed Implementation Example

[0014] like Figure 1-3As shown, a hydraulic brake caliper for electronic parking includes a C-shaped caliper bracket 1 and an outer friction plate 2 disposed on the inner side of one end of the caliper bracket 1. A square sliding cavity is provided inside the other end of the caliper bracket 1, and a brake caliper piston 3 is slidably disposed in the sliding cavity. An inner friction plate 4 opposite to the outer friction plate 2 is fixed to the outer end of the brake caliper piston 3. A clamping nut 5 is fixed inside the brake caliper piston 3, and a drive screw 6 meshing with the clamping nut 5 passes through the clamping nut 5. The other end of the drive screw 6 passes through the caliper bracket 1 and is fixedly connected to the motor shaft of the MGU motor 7. A piston dust cover 8 is fixed to the outer side wall of the brake caliper piston 3. One end of the piston dust cover 8 is fitted into a fixing groove on the outer side wall of the brake caliper piston 3, and the other end of the piston dust cover 8 is fitted into a fixing groove provided in the outer end of the sliding cavity of the caliper bracket 1. The middle part of the piston dust cover 8 is provided with a bent elastic telescopic pleated structure.

[0015] To further ensure the airtightness of the sliding space of the brake caliper piston 3, a square sealing ring 9 is fitted on the inner side of the brake caliper piston 3 of the piston dust cover 8. A thrust needle roller bearing 10 is also fitted on one end of the drive screw 6 that passes through the caliper bracket 1. An inner sealing ring 11 is fitted around the drive screw 6 outside the thrust needle roller bearing 10. A bushing 12 is fitted on the drive screw 6 outside the inner sealing ring 11. An open retaining ring 13 is fitted on the drive screw 6 outside the bushing 12. The outer side of the open retaining ring 13 is opposite to the MGU motor 7. In this way, a multi-layer sealing structure is formed at one end of the MGU motor 7 and one end of the inner friction plate 4.

[0016] The working principle of this utility model is as follows: During braking, the MGU motor 7 drives the drive screw 6 to rotate. Since the brake caliper piston 3 has a square cross-section, the clamping nut 5 is fixed inside the brake caliper piston 3. The clamping nut 5 meshes with the drive screw 6, thus forming a screw movement structure. The rotation of the drive screw 6 pushes the inner friction plate 4 of the brake caliper piston 3 to move towards the outer friction plate 2. When this utility model is installed and used, the brake disc is between the inner friction plate 4 and the outer friction plate 2. The inner friction plate 4 and the outer friction plate 2 clamp the brake disc, thereby achieving braking through this clamping process.

[0017] The above description is merely an illustrative embodiment of this utility model and is not intended to limit the scope of this utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. A hydraulic brake caliper for electronic parking brake, comprising a C-shaped caliper bracket (1) and an outer friction plate (2) disposed on the inner side of one end of the caliper bracket (1), characterized in that: A square sliding cavity is provided inside the other end of the caliper bracket (1). A brake caliper piston (3) is slidably arranged inside the sliding cavity. An inner friction plate (4) opposite to the outer friction plate (2) is fixed at the outer end of the brake caliper piston (3). A clamping nut (5) is fixed inside the brake caliper piston (3). A drive screw (6) meshes with the clamping nut (5). The other end of the drive screw (6) passes through the caliper bracket (1) and is fixedly connected to the motor shaft of the MGU motor (7). A piston dust cover (8) is fixed on the outer side wall of the brake caliper piston (3). One end of the piston dust cover (8) is fitted into the fixing groove on the outer side wall of the brake caliper piston (3). The other end of the piston dust cover (8) is fitted into the fixing groove provided on the outer end of the sliding cavity caliper bracket (1). A bent elastic telescopic pleated structure is provided in the middle part of the piston dust cover (8).

2. A hydraulic brake caliper for electronic parking brake as described in claim 1, characterized in that: A square sealing ring (9) is fitted on the brake caliper piston (3) inside the piston dust cover (8).

3. A hydraulic brake caliper for electronic parking brake as described in claim 1, characterized in that: The drive screw (6) passes through one end of the caliper bracket (1) and is fitted with a thrust needle roller bearing (10).

4. A hydraulic brake caliper for electronic parking brake as described in claim 3, characterized in that: The drive screw (6) outside the thrust needle roller bearing (10) is surrounded by an inner sealing ring (11).

5. A hydraulic brake caliper for electronic parking brake as described in claim 4, characterized in that: The drive screw (6) outside the inner sealing ring (11) is fitted with a bushing (12).

6. A hydraulic brake caliper for electronic parking brake as described in claim 5, characterized in that: The drive screw (6) on the outside of the bushing (12) is fitted with an open retaining ring (13), and the outside of the open retaining ring (13) is opposite to the MGU motor (7).

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