KR-20260062721-A - BRAKE DEVICE FOR VEHICLE

Abstract

The present invention relates to a braking device for a vehicle, comprising: a pedal that can be engaged by a user; a ball head portion connected to the pedal; an operating rod coupled to the ball head portion and moving in conjunction with the engagement of the pedal; a backup piston that moves inside a backup cylinder according to the movement of the operating rod; a bracket housing surrounding the backup piston; and a piston guard mounted on the bracket housing, extending toward the operating rod, and in contact with the operating rod to prevent foreign matter from entering the backup piston.

Inventors

• 피재훈

Assignees

• 현대모비스 주식회사

Dates

Publication Date

20260507

Application Date

20241029

Claims (8)

1. User-adjustable pedal; A ball head part connected to the above pedal; An operating rod coupled to the ball head portion and moving in conjunction with the engagement of the pedal; A backup piston that moves inside the backup cylinder according to the movement of the above-mentioned operating rod; A bracket housing surrounding the above backup piston; and A braking device for a vehicle characterized by including a piston guard that is mounted on the bracket housing, extends toward the operating rod, and contacts the operating rod to prevent foreign matter from entering the backup piston.
2. In paragraph 1, The above piston guard is A guard mounting portion mounted on the above bracket housing; and A braking device for a vehicle characterized by including a guard blocking part formed integrally with the guard mounting part, extending toward the operating rod, and contacting the operating rod.
3. In paragraph 2, The above guard mounting part A perimeter mounting portion surrounding the bracket housing; and It includes a circumferential extension portion that extends from the circumferential mounting portion toward the pedal side and surrounds the operating rod, A braking device for a vehicle characterized by having a connecting groove on the inner surface of the guard mounting portion where the perimeter mounting portion and the perimeter extension portion are connected.
4. In paragraph 3, A braking device for a vehicle characterized in that the above-mentioned connecting groove is formed continuously in the circumferential direction on the inner surface of the above-mentioned guard mounting portion.
5. In paragraph 2, A braking device for a vehicle characterized in that the angle formed by the guard mounting part and the guard blocking part is an acute angle.
6. In paragraph 2, The above guard blocking part A connection blocking part connected to the above guard mounting part; and A braking device for a vehicle characterized by including a contact blocking member that extends from the above-mentioned connection blocking member, has a length longer than the distance from the end of the above-mentioned connection blocking member to the operating rod, and contacts the operating rod.
7. In paragraph 6, A vehicle braking device characterized in that the thickness of the above-mentioned connection blocking part is thicker than the thickness of the above-mentioned contact blocking part.
8. In paragraph 1, A vehicle braking device characterized by the above-mentioned piston guard including a rubber material.

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