Brake device

Patent metadata

Field	Value
Publication number	US-10844916-B2
Application number	US-201816206116-A
Country	US
Kind code	B2
Filing date	Nov 30, 2018
Priority date	Dec 4, 2017
Publication date	Nov 24, 2020
Grant date	Nov 24, 2020

Abstract

A brake device includes a rotating member; a fixed member; a pressing member configured to generate an engaging force between the rotating member and the fixed member; an elastic member configured to apply an elastic force to the pressing member; an engaging force application mechanism configured to apply the engaging force to the pressing member; a torque transmission member configured to transmit torque transmitted from the rotating member to the fixed member; a torque receiving member configured to receive the torque; a conversion mechanism configured to convert the torque into thrust in the axial direction and apply the thrust to the engaging force; and an actuator configured to move the torque receiving member in the axial direction by generating thrust in the torque receiving member and adjust a position of the torque receiving member along the axial direction based on a reaction force against the engaging force.

First claim

What is claimed is:

1. A brake device comprising:
a rotating member configured to be rotated by torque transmitted from a drive force source;
a fixed member disposed to face the rotating member;
a pressing member configured to generate an engaging force between the rotating member and the fixed member by being pressed in an axial direction of a rotation axis of the rotating member;
an elastic member configured to apply an elastic force against a pressing of the pressing member to the pressing member;
an engaging force application mechanism configured to apply the engaging force to the pressing member;
a torque transmission member configured to transmit torque transmitted from the rotating member to the fixed member, the fixed member including a play along a rotation direction of the rotating member;
a torque receiving member configured to receive the torque transmitted from the torque transmission member, rotation of the torque receiving member in a circumferential direction about the axis being blocked;
a conversion mechanism configured to convert the torque received by the torque receiving member into thrust in the axial direction and apply the thrust resulting from the conversion to the engaging force; and
an actuator configured to move the torque receiving member in the axial direction by generating thrust resulting from rotational-to-linear motion conversion in the torque receiving member and adjust a position of the torque receiving member along the axial direction based on a reaction force against the engaging force.

2. The brake device according to claim 1 , wherein the actuator holds the torque receiving member at each of a braking position as a position along the axial direction where the engaging force is generated and an initial position as a position along the axial direction where the engaging force is released and holds the torque receiving member at the braking position when a parking brake is operated.

3. The brake device according to claim 2 , wherein the actuator has a detection unit configured to determine the torque transmitted from the rotating member or an axial force in the axial direction resulting from conversion of the torque and adjusts the initial position of the torque receiving member based on the torque or the axial force determined by the detection unit when the parking brake is released.

4. The brake device according to claim 1 , wherein the engaging force application mechanism is provided with a hydraulic brake mechanism configured to generate the engaging force by hydraulic pressure supply.

5. The brake device according to claim 1 , wherein:
the pressing member has an armature; and
the engaging force application mechanism has a coil and generates the engaging force by moving the armature in the axial direction with a magnetic adsorption force generated by energization of the coil.

Assignees

• Toyota Motor Co Ltd

Inventors

• Isono Hiroshi

Classifications

• B60T1/065

  employing disc (B60T1/062 takes precedence) · CPC title

• F16D65/186

  with full-face force-applying member, e.g. annular · CPC title

• F16D55/46 Primary

  with self-tightening action · CPC title

• F16D2125/38

  with plural cam or ball-ramp mechanisms arranged concentrically with the brake rotor axis · CPC title

• F16D65/567

  for mounting on a disc brake · CPC title