# US 8,998,350 B2 · Pressure damping device for brake system

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- Number: US 8,998,350 B2
- Document ID: US8998350B2
- Status: Granted
- Kind: B2
- Application number: 13/773,536
- Filed: 2013-02-21
- Published: 2013-08-29
- Granted: 2015-04-07
- Earliest claimed: 2012-02-22
- Assignees: Mando Corporation
- Applicants: Yong Kap Kim; Hyun Jun Kim
- Inventors: Yong Kap Kim; Hyun Jun Kim
- Web page: https://patentgrep.com/patent/US8998350B2

## CPC

- F16L 51/00: Expansion-compensation arrangements for pipe-lines (telescopic pipes F16L27/12)
- B60T 8/4068: {the additional fluid circuit comprising means for attenuating pressure pulsations}
- B60T 8/4872: {pump-back systems}
- F16L 55/053: the gas in the reservoir being separated from the fluid in the pipe
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- 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

## Abstract

Disclosed is a pressure damping device for a brake system. The pressure damping device is installed at the brake system having a hydraulic block provided with a first hydraulic circuit to control transfer of fluid pressures generated by a first port of a master cylinder and discharged from a first pump to a first wheel, and a second hydraulic circuit to control transfer of fluid pressures generated by a second port of the master cylinder and discharged from a second pump to a second wheel, and the hydraulic block includes a bore connecting the master cylinder with discharge outlets of the first and second pumps and formed between first and second main oil paths to communicate with the first and second main oil paths, and a pressure damping unit provided in the bore and having a volume changed according to the fluid pressures from the first and second pumps.

## Claims

### Claim 1

A pressure damping device for a brake system, the pressure damping device being installed at the brake system comprising:
a hydraulic block provided with a first hydraulic circuit to control transfer of a fluid pressure generated by a first port of a master cylinder and a fluid pressure discharged from a first pump to at least one first wheel, and
a second hydraulic circuit to control transfer of a fluid pressure generated by a second port of the master cylinder and a fluid pressure discharged from a second pump to at least one second wheel,
wherein the hydraulic block includes a bore adapted connecting the master cylinder with a discharge outlet of each of the first and second pumps and formed between first and second main oil paths having an orifice to communicate with each of the first and second main oil paths, and a pressure damping unit provided in the bore and having a volume changed according to the fluid pressures discharged from the first and second pumps,
wherein the pressure damping unit comprises:
at least two damping members installed at one end of the bore, each of the damping members being provided with a concave portion having opposite sides grooved toward a center thereof; and
a stopper member installed at the other end of the bore to seal the bore,
wherein the damping members are elastically deformed, and an air damping space is formed between the damping members such that a volume of the air damping space changes according to the fluid pressures discharged from the first and second pumps,
wherein a support plate to support the elastically deformed damping members is interposed between the damping members, and
wherein the stopper member is provided with an oil path to connect the fluid pressure discharged from the second pump with the second main oil path and the damping members.

### Claim 2 (depends on 1)

The pressure damping device according to claim 1, wherein the support plate is provided with a through hole communicating with the air damping space formed by the concave portions of the damping members.