KR-20260062718-A - BRAKE DEVICE FOR VEHICLE

KR20260062718AKR 20260062718 AKR20260062718 AKR 20260062718AKR-20260062718-A

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 first spring disposed in the first backup chamber and elastically supporting the backup piston and the pedal simulator piston; a stopper disposed inside the backup cylinder body and restricting the movement of the pedal simulator piston; and a damper disposed between the stopper and the pedal simulator piston and deforms when the pedal simulator piston moves toward the stopper.

Inventors

전준철

Assignees

현대모비스 주식회사

Dates

Publication Date: 20260507
Application Date: 20241029

Claims (10)

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 first spring disposed in the first backup chamber and elastically supporting the backup piston and the pedal simulator piston; A stopper disposed inside the backup cylinder body and restricting the movement of the pedal simulator piston; and A braking device for a vehicle characterized by including a damper disposed between the stopper and the pedal simulator piston, which undergoes shape deformation when the pedal simulator piston moves toward the stopper.
In paragraph 1, The above damper is A damper body formed in the shape of a hollow column; and A braking device for a vehicle characterized by including a damper projection formed protruding from one or more of the first surface of the damper body facing the stopper and the second surface of the damper body facing the pedal simulator piston.
In paragraph 2, A braking device for a vehicle characterized in that the cross-sectional area of the above damper projection decreases as it moves away from the damper body.
In paragraph 3, A braking device for a vehicle characterized in that the above damper protrusions are arranged in plurality at equal rotational intervals on the first surface or the second surface of the damper body.
In paragraph 2, A braking device for a vehicle, characterized in that the damper body has a plurality of damper rib portions formed to protrude outwardly from the outer surface, and the plurality of damper rib portions are arranged spaced apart from each other.
In paragraph 5, A vehicle braking device characterized in that the above damper rib portion is arranged in multiple numbers at equal rotational intervals on the outer circumference of the above damper body.
In paragraph 5, The above damper rib portion is a protruding rib portion located at the center of the longitudinal direction of the damper body; and A braking device for a vehicle characterized by including inclined rib sections that are respectively connected to both ends of the protruding rib section, wherein the height of the protrusion from the damper body decreases as it moves away from the protruding rib section.
In Paragraph 7, A braking device for a vehicle characterized in that the above-mentioned inclined rib portion includes an inclined surface.
In paragraph 8, A braking device for a vehicle characterized in that when the pedal simulator piston moves toward the stopper side to press the damper, the shape deformation of the damper is such that the length in the longitudinal direction decreases and the width in the radial direction increases.
In Paragraph 9, A vehicle braking device characterized by having one damper in the backup cylinder body.

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