Electric brake actuator, and brake system for vehicle

Patent metadata

Field	Value
Publication number	US-9290171-B2
Application number	US-201113885176-A
Country	US
Kind code	B2
Filing date	Nov 17, 2011
Priority date	Nov 17, 2010
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

A motor cylinder device ( 16 ) is configured with a cylinder mechanism ( 76 ) provided with first and second slave pistons that are displaced along a hydraulic pressure chamber; an electric motor ( 72 ) for driving first and second slave pistons; and an actuator housing ( 75 ) formed separable from the cylinder mechanism ( 76 ), wherein the actuator housing houses a gear mechanism for transmitting a rotational driving force of the electric motor ( 72 ), and a conversion mechanism for converting the rotational driving force transmitted through the gear mechanism, into a linear movement and transmitting the linear movement to the piston.

First claim

The invention claimed is:

1. An electric brake system, comprising:
a master cylinder configured to generate a master cylinder pressure according to a braking operation by a driver, and generate a brake hydraulic pressure, based on an electric signal according to the braking operation; and
an electric brake actuator that is communicated and connected with the master cylinder, the electric brake actuator comprising:
a cylinder mechanism provided with a piston that is displaced along a hydraulic pressure chamber:
an electric motor configured to drive the piston; and
an actuator housing formed separable from the cylinder mechanism, wherein the actuator housing houses a gear mechanism configured to transmit a rotational driving force of the electric motor, and a conversion mechanism configured to convert the rotational driving force transmitted through the gear mechanism, into a linear movement and transmit the linear movement to the piston,

wherein the actuator housing includes a mount portion configured to mount the electric brake actuator to a vehicle,
wherein the mount portion comprises:
a first boss portion and a second boss portion protruding toward left and right sides in a direction substantially perpendicular to an axial line of the cylinder mechanism; and
a third boss portion protruding downward from the cylinder mechanism and perpendicular to the first and second boss portions.

2. The electric brake actuator according to claim 1 , wherein the actuator housing is configured to be divisible in two, on a plane substantially orthogonal with an axial line of the cylinder as a dividing plane.

3. A brake system for a vehicle, provided with an electric brake actuator that is communicated and connected with a master cylinder configured to generate a master cylinder pressure according to a braking operation by a driver, and generate a brake hydraulic pressure, based on an electric signal according to the braking operation, the electric brake actuator comprising:
a cylinder mechanism provided with a piston that is displaced along a hydraulic pressure chamber:
an electric motor configured to drive the piston; and
an actuator housing formed separable from the cylinder mechanism, wherein the actuator housing houses a gear mechanism configured to transmit a rotational driving force of the electric motor, and a conversion mechanism configured to convert the rotational driving force transmitted through the gear mechanism, into a linear movement and transmitting the linear movement to the piston,
wherein the actuator housing includes a mount portion configured to be mounted to allow the electric brake actuator to be supported,
wherein the mount portion comprises:
a first boss portion and a second boss portion protruding toward left and right sides in a direction substantially perpendicular to an axial line of the cylinder mechanism; and

a third boss portion protruding downward from the cylinder mechanism and perpendicular to the first and second boss portions.

Assignees

• Ohnishi Takaaki
• Hatano Kunimichi
• Akutsu Kazuyoshi
• Inoue Arata
• Honda Motor Co Ltd

Inventors

• Ohnishi Takaaki
• Hatano Kunimichi
• Akutsu Kazuyoshi
• Inoue Arata

Classifications

• B60T13/662

  characterised by specified functions of the control system components · CPC title

• B60T8/1755

  Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve (road vehicle drive control systems for control of driving stability otherwise than by controlling a particular sub-unit B60W30/02) · CPC title

• B60T8/4081

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

• B60T7/042

  by electrical means, e.g. using travel or force sensors · CPC title

• B60T13/745 Primary

  acting on a hydraulic system, e.g. a master cylinder · CPC title