KR-20260062722-A - BRAKE DEVICE FOR VEHICLE

KR20260062722AKR 20260062722 AKR20260062722 AKR 20260062722AKR-20260062722-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; 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; and a second spring disposed between the stopper and the pedal simulator piston, elastically supporting the pedal simulator piston and positioned on the inner diameter side of the pedal simulator piston.

Inventors

전준철

Assignees

현대모비스 주식회사

Dates

Publication Date: 20260507
Application Date: 20241029

Claims (11)

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; 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; and A braking device for a vehicle characterized by including a second spring disposed between the stopper and the pedal simulator piston, elastically supporting the pedal simulator piston, and located on the inner diameter side of the pedal simulator piston.
In paragraph 1, The above pedal simulator piston is The above pedal simulator piston body; and It includes a pedal simulator piston extension connected to the above pedal simulator piston body and having an inner diameter larger than the inner diameter of the above pedal simulator piston body, A vehicle braking device characterized in that the second spring is located on the inner diameter side of the piston expansion portion of the pedal simulator.
In paragraph 2, The inner diameter of the piston expansion part of the above pedal simulator A seating portion connected to the inner diameter portion of the pedal simulator piston body and on which the second spring is seated; and A braking device for a vehicle characterized by including a first enlarged portion connected to the above-mentioned seating portion and surrounding the second spring.
In paragraph 3, The inner diameter of the piston expansion part of the above pedal simulator A braking device for a vehicle characterized by further including a second enlarged portion surrounding the second spring and having an inner diameter larger than that of the first enlarged portion.
In paragraph 4, The inner diameter of the piston expansion part of the above pedal simulator A braking device for a vehicle characterized by including a transition section that connects the first enlarged section and the second enlarged section, surrounds the second spring, and has an inner diameter that gradually increases from the first enlarged section to the second enlarged section.
In paragraph 2, The above stopper is A stopper body surrounded by the second spring; and A braking device for a vehicle characterized by including a stopper protrusion that is connected to the stopper body, protrudes outward from the stopper body, and surrounds the second spring.
In paragraph 6, The above stopper protrusion A stopper jaw portion connected to the stopper body and on which the second spring is seated; and A braking device for a vehicle characterized by including a first stopper protrusion connected to the stopper jaw portion and surrounding the second spring.
In Paragraph 7, The above stopper protrusion A braking device for a vehicle characterized by further including a second stopper protrusion surrounding the second spring and having an inner diameter larger than that of the first stopper protrusion.
In paragraph 8, The above stopper protrusion A braking device for a vehicle characterized by including a stopper transition portion that connects the first stopper protrusion and the second stopper protrusion, surrounds the second spring, and has an inner diameter that gradually increases from the first stopper protrusion toward the second stopper protrusion.
In paragraph 6, A braking device for a vehicle characterized in that the stopper body is provided with an inwardly concave interference prevention groove in the portion surrounded by the second spring.
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 second backup chamber defined by the pedal simulator piston inside the backup cylinder body, spaced apart from the first backup chamber, and storing brake fluid; A stopper disposed in the second backup chamber and restricting the movement of the pedal simulator piston; and It includes a second spring disposed between the stopper and the pedal simulator piston and elastically supporting the pedal simulator piston, A braking device for a vehicle characterized in that the pedal simulator piston surrounds the second spring, and the maximum outer diameter portion of the pedal simulator piston is closer to the inner wall of the backup cylinder body than the maximum outer diameter portion of the second spring.

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