KR-20260066388-A - BRAKE APPARATUS FOR VEHICLE

KR20260066388AKR 20260066388 AKR20260066388 AKR 20260066388AKR-20260066388-A

Abstract

The present invention relates to a brake device for a vehicle, comprising: a caliper body having a cylinder; a nut screw rotatably disposed in the cylinder; a bolt screw movable in conjunction with the rotation of the nut screw in a first direction or in a second direction opposite to the first direction; a piston movably disposed in the cylinder, moved in the first direction by the pressure of the bolt screw, and interfering with the bolt screw to restrict the rotation of the bolt screw; and a retainer fixed to the cylinder and interfering with the piston to restrict the rotation of the piston.

Inventors

부상필
신충식
전대웅
윤보람
박상준
변문환

Assignees

현대모비스 주식회사

Dates

Publication Date: 20260512
Application Date: 20241104

Claims (10)

A caliper body equipped with a cylinder; A nut screw rotatably disposed in the above cylinder; A bolt screw capable of moving in conjunction with the rotation of the above nut screw in a first direction or in a second direction opposite to the first direction; A piston movably disposed in the above cylinder, moved in the first direction by the pressure of the bolt screw, and interferes with the bolt screw to restrain the rotation of the bolt screw; and A retainer fixed to the cylinder and interfering with the piston to restrict the rotation of the piston; A vehicle brake device including
In paragraph 1, The above piston is, A piston body into which the above bolt screw is inserted; A first interference portion provided on the inner circumferential surface of the piston body portion and interfering with the bolt screw; and A second interference portion provided on the outer surface of the piston body portion and interfering with the retainer; A vehicle brake device characterized by including
In paragraph 2, The first interference portion is formed protruding from the inner circumference of the piston body portion, and A vehicle brake device characterized in that the second interference portion is formed by being recessed on the outer surface of the piston body portion.
In paragraph 3, A vehicle brake device characterized by the second interference portion extending along the central axis direction of the piston.
In paragraph 2, The above bolt screw is, A bolt body portion joined via the above-mentioned nut screw and ball member; A bolt head portion that pressurizes the above piston body portion; and A third interference part provided on the outer surface of the bolt head part and capable of contacting the first interference part; A vehicle brake device characterized by including
In paragraph 5, A vehicle brake device characterized in that the third interference portion is cut to form a flat plane in part of the outer surface of the bolt head portion.
In paragraph 2, The above retainer is, A ring-shaped retainer body portion disposed between the cylinder and the piston; and A fourth interference part provided on the inner circumferential surface of the retainer body part and capable of contacting the second interference part; A vehicle brake device characterized by including
In Paragraph 7, A vehicle brake device characterized in that the above-mentioned fourth interference portion is formed protruding from the inner circumference of the above-mentioned retainer body portion.
In Paragraph 7, The above retainer is, A damper part coupled to the retainer body part and capable of contacting the piston; A vehicle brake device characterized by further including
In Paragraph 9, A vehicle brake device characterized in that the damper portion further comprises a projection portion that rests on the piston.

Description

Brake apparatus for vehicle The present invention relates to a vehicle brake device, and more specifically, to a vehicle brake device capable of securing stable braking performance. Generally, a vehicle's braking system pushes a piston with driving force to bring the pad and disc into close contact, and brakes the vehicle using the frictional force between the pad and the disc. Among vehicle braking systems, the Electro-Mechanical Brake (EMB) does not use hydraulics; instead, it mounts a motor-driven actuator on the caliper and generates braking force by pressurizing a piston through a mechanism that converts the rotational motion of a screw into the linear motion of a nut, or vice versa. These EMBs enable active braking and independent braking for each wheel, allowing for the implementation of not only standard main braking but also additional functions such as ABS (Anti-lock Brake System), ESC (Electric Stability Control), TCS (Traction Control System), and AEB (Automatic Emergency Braking), and can achieve higher performance due to the absence of hydraulic transmission delay. The background technology of the present invention is disclosed in Korean Published Patent Application No. 10-2024-0054695 (published April 26, 2024, Title of Invention: Brake Device for Vehicle). FIG. 1 is a perspective view of a vehicle brake device according to an embodiment of the present invention, viewed from one direction. FIG. 2 is a perspective view of FIG. 1 seen from a different direction. FIG. 3 is a cross-sectional view schematically showing a vehicle brake device according to a first embodiment of the present invention, Fig. 4 is a partial enlarged view of Fig. 3, FIG. 5 is an exploded perspective view of the configuration of a vehicle brake device according to a first embodiment of the present invention, viewed from one direction. FIG. 6 is an exploded perspective view of FIG. 5 viewed from a different direction. FIG. 7 is a cross-sectional view schematically showing a vehicle brake device according to a second embodiment of the present invention. Fig. 8 is a partial enlarged view of Fig. 7, FIG. 9 is an exploded perspective view of the configuration of a vehicle brake device according to a second embodiment of the present invention, viewed from one direction. FIG. 10 is an exploded perspective view of FIG. 9 viewed from a different direction. FIGS. 11 and 12 are partially enlarged cross-sectional views schematically illustrating the assembly process of a vehicle brake device according to an embodiment of the present invention. Hereinafter, an embodiment of a vehicle brake device according to the present invention will be described with reference to the attached drawings. In this process, the thickness of lines or the size of components shown in the drawings may be exaggerated for clarity and convenience of explanation. Furthermore, the terms described below are defined considering their functions in the present invention, and these may vary depending on the intention or convention of the user or operator. Therefore, the definitions of these terms should be based on the content throughout this specification. FIG. 1 is a perspective view of a vehicle brake device according to an embodiment of the present invention viewed from one direction, FIG. 2 is a perspective view of FIG. 1 viewed from another direction, FIG. 3 is a cross-sectional view schematically showing a vehicle brake device according to a first embodiment of the present invention, FIG. 4 is a partial enlarged view of FIG. 3, FIG. 5 is an exploded perspective view of the configuration of a vehicle brake device according to a first embodiment of the present invention viewed from one direction, and FIG. 6 is an exploded perspective view of FIG. 5 viewed from another direction. Referring to FIGS. 1 to 6, a vehicle brake device according to the first embodiment of the present invention includes a caliper body (100), a piston (200), a nut screw (300), a bolt screw (400), and a retainer (500), which are described in detail as follows. The caliper body (100) forms the general appearance of a vehicle brake device according to the present embodiment and can support the piston (200), nut screw (300), bolt screw (400), and retainer (500) in its entirety. The caliper body (100) according to the present embodiment may include a bridge (110), a finger (120), and a cylinder (130). The bridge (110) forms the central exterior of the caliper body (100) and can support the finger (120) and cylinder (130). The bridge (110) can be connected to a carrier (10) fixed to a knuckle (not shown), etc. via a guide rod (11). The bridge (110) can be connected to the carrier (10) so as to be reciprocally movable along a first direction (D1) or a second direction (D2). The first direction (D1) and the second direction (D2) can be exemplified as opposite directions to each other and parallel to the X-axis with respect to the center axis (C1) of the brake disc (20), i.e., FIG. 3. The lower su