KR-20260062720-A - BRAKE DEVICE FOR VEHICLE
Abstract
The present invention relates to a braking device for a vehicle, comprising: a backup cylinder body; a backup piston disposed inside the backup cylinder body and movable by the application of a pedal; a pedal simulator piston movable inside the backup cylinder body and spaced apart from the backup piston; a first backup chamber defined by the backup piston and the pedal simulator piston inside the backup cylinder body and storing brake fluid; a stopper disposed inside the backup cylinder body and restricting the movement of the pedal simulator piston; a second backup chamber defined by the stopper and the pedal simulator piston inside the backup cylinder body and spaced apart from the first backup chamber and storing brake fluid; a first seal cup installed on the inner wall of the backup cylinder body, contactable with the backup piston, and spaced apart from a first port connected to a reservoir toward the pedal side; and a grease pocket portion spaced apart from the first seal cup toward the pedal side and formed in a concave groove shape so as to be filled with grease.
Inventors
- 피재훈
Assignees
- 현대모비스 주식회사
Dates
- Publication Date
- 20260507
- Application Date
- 20241029
Claims (6)
- Backup cylinder body; A backup piston disposed inside the above-mentioned backup cylinder body and movable by the application of pressure from a pedal; A pedal simulator piston that is movable inside the backup cylinder body and spaced apart from the backup piston; A first backup chamber defined by the backup piston and the pedal simulator piston inside the backup cylinder body, in which brake fluid is stored; A stopper disposed inside the backup cylinder body and restricting the movement of the pedal simulator piston; A second backup chamber defined by the stopper and the pedal simulator piston inside the backup cylinder body, spaced apart from the first backup chamber, and storing brake fluid; A first seal cup installed on the inner wall of the backup cylinder body, capable of contacting the backup piston, and spaced apart from a first port connected to the reservoir toward the pedal side; and A braking device for a vehicle characterized by including a grease pocket portion that is spaced apart from the first seal cup toward the pedal side and formed in a concave groove shape so as to be filled with grease.
- In paragraph 1, A vehicle braking device characterized in that the grease pocket portion is formed circumferentially along the inner wall of the backup cylinder body.
- In paragraph 1, A braking device for a vehicle, characterized in that the first seal cup has a filling groove on its inner surface that contacts the backup piston, into which grease can be filled.
- In paragraph 3, A vehicle braking device characterized in that the filling groove is formed along the circumferential direction on the inner surface of the first seal cup.
- In paragraph 4, A vehicle braking device characterized in that the above-mentioned filling grooves are provided in plurality on the inner surface of the above-mentioned first seal cup.
- In paragraph 5, A vehicle braking device characterized in that the above-mentioned filling grooves are arranged at equal intervals on the inner surface of the first seal cup.
Description
Brake Device for Vehicle The present invention relates to a braking device for a vehicle. Generally, due to the characteristics of electric vehicle braking systems, a device is required that converts the rotational motion of a motor into the linear motion of a piston inside a cylinder to generate brake fluid pressure. A ball screw device, which is a device for converting the rotational motion of a motor into linear motion and comprises a screw shaft that rotates by receiving the rotational force of the motor, a nut that is coupled to the screw shaft via a ball and moves in the axial direction of the screw shaft, and a piston coupled to the nut that pressurizes the working fluid inside the cylinder, is applied to an electric brake device. The background technology of the present invention is disclosed in Korean Published Patent Application No. 10-2021-0064367 (published June 2, 2021; Title of Invention: Hydraulic Unit for Hydraulic Vehicle Brake System). FIG. 1 is a hydraulic circuit diagram showing a vehicle braking device according to one embodiment of the present invention. FIG. 2 is a cross-sectional view showing a backup master cylinder section according to one embodiment of the present invention. Figure 3 is an enlarged view of part A of Figure 2. FIG. 4 is a perspective view showing a first seal cup according to one embodiment of the present invention. FIG. 5 is a cross-sectional view showing a first seal cup according to one embodiment of the present invention. FIG. 6 is a cross-sectional perspective view showing a first seal cup according to one embodiment of the present invention. Figure 7 is an enlarged view of part B of Figure 2. Figure 8 is an exploded perspective view showing part B of Figure 2. FIG. 9 is a drawing showing the area around a piston guard according to one embodiment of the present invention. Figure 10 is an enlarged view of section C of Figure 9. FIG. 11 is a perspective view showing a damper according to one embodiment of the present invention. FIG. 12 is a front view showing a damper according to one embodiment of the present invention. Figure 13 is a cross-sectional view showing BB of Figure 11. Figure 14 is a cross-sectional view showing CC of Figure 11. FIG. 15 is a cross-sectional view showing DD of FIG. 11. FIG. 16 is a drawing showing states A to E in which a damper according to one embodiment of the present invention is deformed by a stopper and a pedal simulator piston. FIG. 17 is a displacement-force graph in states A to E of FIG. 16. Hereinafter, embodiments of a vehicle braking 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 driver or operator. Therefore, the definitions of these terms should be based on the content throughout this specification. FIG. 1 is a hydraulic circuit diagram showing a braking device for a vehicle according to an embodiment of the present invention; FIG. 2 is a cross-sectional view showing a backup master cylinder portion according to an embodiment of the present invention; FIG. 3 is an enlarged view of portion A of FIG. 2; FIG. 4 is a perspective view showing a first seal cup according to an embodiment of the present invention; FIG. 5 is a cross-sectional view showing a first seal cup according to an embodiment of the present invention; FIG. 6 is a cross-sectional perspective view showing a first seal cup according to an embodiment of the present invention; FIG. 7 is an enlarged view of portion B of FIG. 2; FIG. 8 is an exploded perspective view showing portion B of FIG. 2; FIG. 9 is a view showing the area around a piston guard according to an embodiment of the present invention; FIG. 10 is an enlarged view of portion C of FIG. 9; FIG. 11 is a perspective view showing a damper according to an embodiment of the present invention; FIG. 12 is a front view showing a damper according to an embodiment of the present invention; FIG. 13 is a cross-sectional view showing B-B of FIG. 11; and FIG. 14 is FIG. 11 Figure 15 is a cross-sectional view showing C-C, Figure 11 is a cross-sectional view showing D-D, Figure 16 is a diagram showing states A to E in which a damper according to an embodiment of the present invention is deformed by a stopper and a pedal simulator piston, and Figure 17 is a displacement-force graph in states A to E of Figure 16. Referring to FIGS. 1 and 2, a vehicle braking device (1) according to one embodiment of the present invention may include a reservoir (10), a backup master cylinder section (100), a main master cylinder section (30), a motor (M), a first fluid passage section (50), a first valve section (55), a second fluid passage section (60) and a secon