Pedal simulator for active brake system

Patent metadata

Field	Value
Publication number	US-9487198-B2
Application number	US-201414180937-A
Country	US
Kind code	B2
Filing date	Feb 14, 2014
Priority date	Feb 20, 2013
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

Disclosed herein is a pedal simulator for an active brake system. The pedal simulator includes a simulator block provided therein with a bore, a first reaction unit including a first reaction piston slidably installed in the bore, a first damping member installed at the first reaction piston, and a first reaction spring compressed by the first reaction piston, and a second reaction unit including a second reaction piston provided in the bore to support the first reaction spring and slide in the bore, a damping housing connected to the simulator block to be spaced a certain distance apart from the second reaction piston, a second reaction spring installed between the second reaction piston and the damping housing to be compressed by the second reaction piston, and a second damping member installed in the damping housing to contact the second reaction piston.

First claim

What is claimed is:

1. A pedal simulator for an active brake system installed at a master cylinder to receive hydraulic pressure according to a driver's pedal force to provide pedal feel to the driver, the pedal simulator comprising:
a simulator block provided with an oil hole formed at an upper portion thereof to be connected to the master cylinder, and provided therein with a bore to communicate with the oil hole;
a damping housing coupled to the bore to seal a lower end of the bore;
a first reaction unit provided in the bore and adapted to provide reaction force by being pressed by oil introduced from the master cylinder;
a second reaction unit supported by the damping housing and adapted to provide reaction force by being compressed according to pressing of the first reaction unit; and
an elastic member provided to the second reaction unit and adapted to provide reaction force by contacting an upper end of the damping housing when the second reaction unit is compressed and moved a certain distance,
wherein the elastic member comprises a coupling segment coupled to the second reaction piston and a plurality of elastic segments arranged spaced a certain distance from each other along an edge of the coupling segment and extending outward, the elastic segments being inclinedly bent downward to be elastically deformed by contacting the damping housing.

2. The pedal simulator according to claim 1 , wherein the first reaction unit comprises:
a first reaction piston slidably installed in the bore;
a first damping member installed at the first reaction piston to move together with the first reaction piston; and
a first reaction spring compressed by the first reaction piston.

3. The pedal simulator according to claim 2 , wherein the second reaction unit comprises:
a second reaction piston provided in the bore to be spaced a certain distance from the first reaction piston and to support the first reaction spring and slide in the bore;
a second reaction spring installed between the second reaction piston and the damping housing to be compressed by the second reaction piston; and
a second damping member installed in the damping housing and adapted to be elastically deformed when pressed by the second reaction piston.

4. The pedal simulator according to claim 3 , wherein the first damping member and second damping member are formed of rubber to be elastically deformable.

5. The pedal simulator according to claim 3 , wherein the damping housing comprises:
a body spaced a certain distance from the second reaction piston, formed in a shape of a cylinder with an open top, and provided therein with an accommodation space; and
a flange radially extending from an outer circumferential surface of a lower portion of the body,
wherein the flange is connected to the bore.

6. The pedal simulator according to claim 5 , wherein an upper surface of the flange is provided with a support groove to support the second reaction spring.

7. The pedal simulator according to claim 5 , wherein the second damping member is installed in the accommodation space of the body such that a predetermined space is formed between the second damping member and the accommodation space to allow a volume of the second damping member to change when the second damping member is elastically deformed by being pressed.

8. The pedal simulator according to claim 3 , wherein the first reaction spring is provided with a modulus of elasticity lower than a modulus of elasticity of the second reaction spring such that the second reaction piston is pushed after the first reaction piston is pushed.

9. The pedal simulator according to claim 1 , wherein the elastic member is integrally formed through a press technique.

10. The pedal simulator according to claim 1 , wherein the first reaction unit and the second reaction unit are arranged in series in the bore.

11. A pedal simulator for an active brake system installed at a master cylinder to receive hydraulic pressure according to a driver's pedal force to provide pedal feel to the driver, the pedal simulator comprising:
a simulator block provided with an oil hole formed at an upper portion thereof to be connected to the master cylinder, and provided therein with a bore to communicate with the oil hole;
a damping housing coupled to the bore to seal a lower end of the bore;
a first reaction unit provided in the bore and adapted to provide reaction force by being pressed by oil introduced from the master cylinder;
a second reaction unit supported by the damping housing and adapted to provide reaction force by being compressed according to pressing of the first reaction unit; and
an elastic member provided to the second reaction unit and adapted to provide reaction force by contacting an upper end of the damping housing when the second reaction unit is compressed and moved a certain distance,
wherein the first reaction unit comprises:
a first reaction piston slidably installed in the bore;
a first damping member installed at the first reaction piston to move together with the first reaction piston; and
a first reaction spring compressed by the first reaction piston,

wherein the second reaction unit comprises:
a second reaction piston provided in the bore to be spaced a certain distance from the first reaction piston and to support the first reaction spring and slide in the bore;
a second reaction spring installed between the second reaction piston and the damping housing to be compressed by the second reaction piston; and
a second damping member installed in the damping housing and adapted to be elastically deformed when pressed by the second reaction piston, and

wherein an insertion groove recessed upward to form a stepped portion is formed at a lower end of the first reaction piston, wherein the first damping member is installed in the insertion groove, and an upper end of the first reaction spring is supported by the stepped portion.

12. The pedal simulator according to claim 11 , wherein the second reaction piston comprises:
a protrusion protruding toward the first damping member such that the protrusion is spaced a certain distance from the first damping member; and
an extension extending radially outward from a lower end of the protrusion,
wherein the protrusion is inserted into the first reaction spring such that a lower end of the first reaction spring is supported by the extension.

13. The pedal simulator according to claim 12 , wherein the first damping member contacts the second reaction piston to provide reaction force when the first reaction piston is pushed, and the second damping member is pressed to provide reaction force when the second reaction piston is pushed.

14. A pedal simulator for an active brake system installed at a master cylinder to receive hydraulic pressure according to a driver's pedal force to provide pedal feel to the driver, the pedal simulator comprising:
a simulator block provided with an oil hole formed at an upper portion thereof to be connected to the master cylinder, and provided therein with a bore to communicate with the oil hole;
a damping housing coupled to the bore to seal a lower end of the bore;
a first reaction unit provided in the bore and adapted to provide reaction force by being pressed by oil introduced from the master cylinder;
a second reaction unit supported by the damping housing and adapted to provide reaction force by being compressed according to pressing of the first reaction unit; and
an elastic member provided to the second reaction unit and adapted to provide reaction force by contacting an upper end of the damping housing when the second reac

Assignees

• Mando Corp

Inventors

• Kim Yong-Kap
• Kim Byung-Ki

Classifications

• G05G5/03

  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) · CPC title

• B60T8/4081

  Systems with stroke simulating devices for driver input (B60T8/4077 takes precedence) · CPC title

• B60T2201/083

  using active brake actuation · CPC title

• G05G1/44

  pivoting · CPC title

• B60T11/20

  Tandem, side-by-side, or other multiple master cylinder units · CPC title