# US 11,027,714 B2 · Brake apparatus for vehicle

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- Number: US 11,027,714 B2
- Document ID: US11027714B2
- Status: Granted
- Kind: B2
- Application number: 16/108,162
- Filed: 2018-08-22
- Published: 2019-02-28
- Granted: 2021-06-08
- Earliest claimed: 2017-08-30
- Assignees: Hyundai Mobis Co., Ltd.
- Applicants: HYUNDAI MOBIS Co., Ltd.
- Inventors: Jong Sung Kim
- Web page: https://patentgrep.com/patent/US11027714B2

## CPC

- B60T 8/409: {characterised by details of the stroke simulating device}
- B60T 11/232: Recuperation valves
- B60T 11/236: Piston sealing arrangements
- G05G 5/03: Means for enhancing the operator's awareness of arrival of the controlling member at a command or datum position; Providing feel, e.g. means for creating a counterforce (arrangements for indicating the position of the controlling member G05G1/015)
- B60T 2220/04: Pedal travel sensor, stroke sensor; Sensing brake request
- B60T 2270/82: Brake-by-Wire, EHB
- B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- G05G: CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY ("Bowden" or like mechanisms F16C1/10; gearings or mechanisms not peculiar to this purpose F16H; speed changing or reversing mechanisms for gearings conveying rotary motion F16H59/00 - F16H63/00)

## Abstract

A brake apparatus for a vehicle may including: a cylinder including a supply flow path to supply working fluid of a reservoir and a hydraulic chamber connected to the supply flow path; a piston movably installed in the cylinder, and connected to a brake pedal; an elastic member installed in the hydraulic chamber so as to elastically support the piston; a sealing member installed on the outer surface of the piston so as to be in contact with the inner surface of the hydraulic chamber; and a communication flow path formed on the inner surface of the cylinder along the longitudinal direction of the cylinder, and guiding the working fluid of the hydraulic chamber to the opposite side of the moving direction of the piston, when the piston is moved.

## Claims

### Claim 1

A brake apparatus for a vehicle, comprising:
a cylinder comprising a supply flow path configured to supply working fluid of a reservoir and a hydraulic chamber connected to the supply flow path;
a piston movably installed in the cylinder, and connected to a brake pedal;
an elastic member installed in the hydraulic chamber so as to elastically support the piston;
a sealing member installed on the outer surface of the piston so as to be in contact with the inner surface of the hydraulic chamber; and
a communication flow path formed on the inner surface of the cylinder along the longitudinal direction of the cylinder, which guides the working fluid of the hydraulic chamber to the opposite side of the moving direction of the piston, when the piston is moved,
wherein:
the hydraulic chamber comprises:
a first hydraulic chamber accommodating an end portion of the piston, and having the communication flow path formed therein; and
a second hydraulic chamber having an inner diameter less than an inner diameter of the first hydraulic chamber, and connected to the supply flow path;
the sealing member has a larger size than the inner diameter of the first hydraulic chamber and the outer diameter of a division ring of the piston;
the sealing member divides the first hydraulic chamber into a first space and a second space when the piston is moved; and
the working fluid of the first hydraulic chamber flows to the first and second spaces through the communication flow path when the piston is pressurized and depressurized.

### Claim 2 (depends on 1)

The brake apparatus of claim 1, wherein, when the piston is pressurized by the brake pedal, the first space in the first hydraulic chamber is gradually decreased and the second space in the first hydraulic chamber is gradually increased.

### Claim 3 (depends on 1)

The brake apparatus of claim 1, wherein:
the piston comprises the division ring protruded from the end portion thereof; and
the sealing member is installed on the division ring.

### Claim 4 (depends on 1)

The brake apparatus of claim 1, wherein:
a first sealing cup is installed on the inner surface of the second hydraulic chamber between the supply flow path and the first hydraulic chamber;
the piston has a piston chamber that communicates with the first hydraulic chamber; and
the piston chamber has a cut-off hole that communicates with the supply flow path.

### Claim 5 (depends on 4)

The brake apparatus of claim 4, wherein the cut-off hole is formed in plurality along the circumferential direction of the piston chamber.

### Claim 6 (depends on 4)

The brake apparatus of claim 4, wherein the cut-off hole is configured to cause the working fluid of the piston chamber to flow toward the supply flow path in a section between the first sealing cup and the supply flow path.

### Claim 7 (depends on 6)

The brake apparatus of claim 6, further comprising a second sealing cup installed on the inner surface of the second hydraulic chamber at a side opposite that of the first sealing cup based on the supply flow path.