# US 2019/0170200 A1 · Brake device

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- Number: US 2019/0170200 A1
- Document ID: US20190170200A1
- Status: Published application
- Kind: A1
- Application number: 16/206,116
- Filed: 2018-11-30
- Published: 2019-06-06
- Earliest claimed: 2017-12-04
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Hiroshi Isono
- Web page: https://patentgrep.com/patent/US20190170200A1

## CPC

- F16D 55/18: Brakes actuated by a fluid-pressure device arranged in or on the brake
- B60T 1/065: {employing disc (B60T1/062 takes precedence)}
- F16D 55/46: with self-tightening action
- F16D 65/183: {with force-transmitting members arranged side by side acting on a spot type force-applying member}
- F16D 65/186: {with full-face force-applying member, e.g. annular}
- F16D 65/567: {for mounting on a disc brake}
- F16D 2066/003: {Position, angle or speed}
- F16D 2066/005: {Force, torque, stress or strain}
- F16D 2121/04: acting on a piston-type actuator, e.g. for liquid pressure
- F16D 2121/20: using electromagnets
- F16D 2125/06: Pistons
- F16D 2125/36: Helical cams, Ball-rotating ramps
- F16D 2125/38: with plural cam or ball-ramp mechanisms arranged concentrically with the brake rotor axis
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES

## 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.

## Claims

### Claim 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 art 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 2)

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.

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 1)

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.