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Vehicle brake device

A vehicle braking and parking brake technology, applied in the direction of brakes, brake components, vehicle components, etc., can solve the problems of inability to overcome the self-locking force of the EPB and the inability to release the EPB.

Active Publication Date: 2015-02-11
ADVICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, because the output of the EPB decreases more than expected according to the actuation condition of the EPB, or because of an increase in the frictional resistance of the self-locking portion of the EPB, a change in temperature, or a change over time, etc., it may occur that the self-locking force of the EPB cannot be overcome. Lock force and the problem of not being able to release the EPB

Method used

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  • Vehicle brake device
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no. 1 approach

[0028] A first embodiment of the present invention will be described. In this embodiment, a vehicle brake apparatus in which a disc brake type EPB is applied to a rear wheel system will be described as an example. figure 1 It is a schematic diagram showing an overall outline of the vehicle braking apparatus according to the present embodiment. figure 2 It is a schematic cross-sectional view of a rear wheel braking mechanism arranged in a vehicle braking device. Hereinafter, description will be made with reference to these drawings.

[0029] like figure 1 As shown, the vehicle braking apparatus is provided with a service brake 1 that generates a service braking force based on a driver's braking operation, and an EPB 2 that restricts the movement of the vehicle when parking or the like.

[0030] The service brake 1 is a hydraulic brake mechanism that generates brake fluid pressure based on the driver's depression of the brake pedal 3 and generates a service braking force bas...

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Abstract

In order to reliably cause an electric parking brake (EPB) to perform a release operation to release parking brake force, in cases when it is determined that an unreleasable state in which a release operation cannot be performed is present when release control is performed, a service break is used to perform back-up pressurization. As a result, wheel cylinder (W / C) pressure causes a piston (19) to apply a pressing force in the direction in which a brake pad (11) presses against a brake disk (12), and the load applied to an EPB motor (10) is reduced, and thus a release operation can be performed even if the output of the motor (10) is lower than when back-up pressurization had not been performed.

Description

technical field [0001] The present invention relates to a vehicle braking apparatus having an electric parking brake mechanism (hereinafter referred to as EPB). Background technique [0002] In the related art, PTL 1 discloses a vehicle brake mechanism that combines an EPB and a service brake formed by a hydraulic brake device. In this brake mechanism, when the EPB is actuated and released, the EPB and the service brake using hydraulic pressure are simultaneously used. Thus, the capacity of the EPB is reduced and size reduction and cost reduction are achieved. Specifically, when the EPB is activated and released, the brake fluid pressure (hereinafter referred to as backup pressurization) in the wheel cylinder (hereinafter referred to as W / C) is increased by the service brake, and the The piston is pressed, and the load applied to the motor of the EPB is reduced. Thus, actuation and release of the EPB can be performed even when the output of the motor decreases. In additi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60T13/74B60T7/12B60T17/18B60T17/22
CPCB60T13/741B60T13/662B60T17/221B60T2270/402B60T8/17B60T8/172
Inventor 汤浅贤太郎半泽雅敏
Owner ADVICS CO LTD