Electric brake apparatus for vehicle

Abstract

Disclosed is an electric brake apparatus for a vehicle, wherein an electric caliper (12) is provided with an electric drive mechanism (20) for generating a pressing force for pressing a friction pad (13) against a disk rotor (11), and a retraction mechanism (40) provided in a piston (32) of a pressing mechanism (30). The retraction mechanism (40) is provided with a reversing member (41) which is compressed by a power transmission portion (32a) and a pressing portion (32b) of the piston (32), to generate a reversing force. Furthermore, the retraction mechanism (40) is provided with a movable element (42) which relatively moves backward by the reversing force, and a first elastic member (43) which is compressed by the movable element (42) and the forward moving power transmission portion (32a), to apply a restoring force. Thus, in the retraction mechanism (40), the reversing member (41) generates a reversing force in conjunction with the forward movement of the power transmission portion (32a), and the movable element (42) relatively moves backward, to compress the first elastic member (43). When a free rotation (no-load rotation) of a brake motor (21) which is a component of a mechanism (20) is allowed, the restoring force generated by the compression of the first elastic member (43) is applied to the power transmission portion (32a), to move the piston (32) backward.

Description

technical field [0001] The present invention relates to an electric brake device for a vehicle including a brake rotor that rotates integrally with a wheel, and an electric brake caliper that presses a brake friction member toward the brake rotor by electromotive force. Background technique [0002] Conventionally, for example, an electric brake control device and an electric brake control method disclosed in Japanese Patent Application Laid-Open No. 2008-57642 are known. In this conventional electric brake control device and control method, when the brake friction body satisfies a preset condition, the brake friction body is set between a predetermined first energization amount and a second energization amount smaller than the first energization amount. The amount of energization to the motor is gradually decreased, and the standby position of the brake friction body is set based on the rotational speed of the motor during the gradually decreased control. Accordingly, slip...

AI Technical Summary

Problems solved by technology

[0006] However, in the above-mentioned conventional electric brake control device, control method, and electric brake device, in order to ensure an appropriate gap between the brake rotating body and the brake friction body, the driving motor and the electric unit during braking are At the same time, for example, it is necessary to control the inverter circuit, etc. to drive the motor and the electric unit extremely finely, and the drive control becomes complicated and cumbersome

In addition, in order to ensure the gap, it is necessary to supply electric power to the motor and the electric unit, and there is still room for improvement from the viewpoint of energy saving.

Images