Electro Mechanical Brake, Control Device

• US 20070228824A1
• Filed: 04/02/2007
• Published: 10/04/2007
• Est. Priority Date: 04/03/2006
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Yasukawa, Daisuke, Sano, Kazumoto
• Granted Patent: US 8,070,238 B2
• Time in Patent Office: Days
• US Class Current: 303/171
• CPC Class Codes: B60T 13/02 with mechanical assistance or drive combined with fluid pressure B60T13/588
• CPC Class Codes: B60T 13/746 and mechanical transmission of the braking action
• CPC Class Codes: F16D 2055/002 assembled from a plurality of parts
• CPC Class Codes: F16D 2121/24 using motors
• CPC Class Codes: F16D 2125/36 Helical cams, Ball-rotating ramps
• CPC Class Codes: F16D 65/18 adapted for drawing members together , e.g. for disc brakes

Abstract

An electro mechanical brake apparatus is provided, in which a counter-measure for the heat of the driving circuit is much improved when configured to be integrated with an electric circuit. An electric circuit portion is provided by sandwiching a motor with brake pads, and a power module is provided so that a heat dissipating surface is opposed to the inner surface of the metallic outer case of the electric circuit portion, and a control circuit board is disposed at the motor side for the power module.

Claims

1. An electro mechanical brake apparatus, comprising:

a brake pad provided in a brake caliper and depressing a disc rotor;

a motor provided in the interior of the brake caliper and generating a depressing force of the brake pad;

a metallic case disposed at the opposite side of the brake pad by sandwiching the motor and fixed to the brake pad;

a power module having an inverter element for motor driving in which a heat dissipation surface is provided so as to oppose the inner surface of the metallic case; and

a control board provided in the interior of the metallic case and disposed at the brake caliper side for the power module.

2. The electro mechanical brake apparatus according to claim 1, wherein a conversion mechanism for generating a depressing force of the brake pad based on a rotation torque of the motor is provided between the motor and the brake pad.

3. The electro mechanical brake apparatus according to claim 1, wherein, between a control circuit portion comprising the metallic case, the power module and the control board and the brake caliper, a resinous plate is provided.

4. The electro mechanical brake apparatus according to claim 3, wherein the metallic case has a concavity covered by the resinous plate, and in a space created by the metallic case and the resinous plate, the power module and the control board are provided.

5. The electro mechanical brake apparatus according to claim 3, wherein a plurality of wirings for connecting the control board and the power module are buried in the resinous plate.

6. The electro mechanical brake apparatus according to claim 3, wherein the motor comprises a stator provided with a three-phase winding and a rotor having a permanent magnet, and a terminal of the three-phase winding of the stator penetrates the resinous plate and extends into the space created by the metallic case and the resinous plate, and is coupled with the wiring buried in the resinous plate inside the space, and the three-phase winding is electrically connected to an output end of the power module through the wiring.

7. The electro mechanical brake apparatus according to claim 3, wherein a thrust plate of the brake caliper is disposed at a position deeper than the end surface in which a frame body of the brake caliper abuts on the resinous plate.

8. The electro mechanical brake apparatus according to claim 3, wherein an inner case is provided at the opposite side of the brake caliper of the resinous plate.

9. The electro mechanical brake apparatus according to claim 1, wherein a protruded body is formed on the outer surface corresponding to the inner surface to which the power module of the metallic case is opposed.

10. The electro mechanical brake apparatus according to claim 1, wherein the metallic case is provided with an opening portion, and comprises a metallic cover to cover the opening portion.

11. A electro mechanical brake apparatus comprising a brake portion, a control circuit portion and a support portion for fixing the brake portion to a vehicle,

wherein the brake portion comprises an external brake pad and inner brake pad depressed by an external braking surface and an inner braking surface of a disc rotor rotating together with a wheel, respectively, a motor for generating a rotation torque, and a conversion mechanism for generating a depressing force of the brake pads of the external side and inner side based on the rotation torque,

wherein the control circuit portion is provided with a power module having a control board and an inverter element provided with a control circuit having a CPU for controlling the rotation torque of the motor, and a metallic case,

wherein the control circuit portion is fitted to the external side of the brake portion in a direction facing from the external braking surface to the inner braking surface of the disc rotor, and the metallic case is positioned at the external side portion of the control circuit portion in the direction facing from the external braking surface to the inner braking surface of the disc rotor,

wherein the power module is disposed in the side of the metallic case between the metallic case and the brake portion, and the control board is disposed in the side of the brake portion.

12. An electro mechanical brake apparatus comprising a carrier, a caliper supported by the carrier, and a control circuit portion fixed to the caliper,

wherein the caliper comprises an external brake pad and an inner brake pad depressed by an external braking surface and an inner braking surface of a disc rotor rotating together with a wheel, respectively, a motor for generating a rotation torque, and a conversion mechanism for pressing the brake pads of the external side and inner side to the disc rotor based on the rotation torque,

wherein the control circuit portion is provided with a metallic case on the one side, and is provided with a resinous plate on the other side,

wherein the metallic case has a concavity, and is configured to cover the concavity of the metallic case by the resinous plate, and in the space created by the metallic case and the resinous plate, a control board provided with a control circuit for controlling the rotation torque of the motor and a power module having an inverter element are provided,

wherein the control circuit portion is fixed to the caliper so as to position the resinous plate at the side of the caliper,

wherein the control board and the power module disposed in the space created by the metallic case and the control board have the power module disposed on the side of the metallic case, and have the control board disposed on the side of the resinous plate,

wherein a plurality of wirings for connecting the control board and the power module are buried in the resinous plate,

wherein the power module is controlled by the control signal outputted from the circuit of the control board so that the torque of the motor is controlled, and based on the rotation torque generated by the motor, by the conversion mechanism, the external and inner side brake pads depress the braking surface of the disc rotor.

13. The electro mechanical brake apparatus according to claim 12, wherein the motor is provided with a stator provided with a three phase winding and a rotor having a permanent magnet, and a terminal of the three phase winding of the stator penetrates the resinous plate and extends into the space created by the metallic case and the resinous plate, and is coupled with the wirings buried in the resinous plate in the space, and the three phase winding is electrically connected to the output terminal of the power module through the wirings.

14. An electro mechanical brake apparatus comprising a carrier, a caliper supported by the carrier, and a control circuit portion fixed to the caliper,

wherein the caliper comprises an external brake pad and inner brake pad depressed by an external braking surface and an inner braking surface of a disc rotor rotating together with a wheel, respectively, a motor for generating a rotation torque, and a conversion mechanism for pressing the brake pads of the external side and inner side to the disc rotor by the rotation torque,

wherein the control circuit portion is provided with a metallic case having a concavity,

wherein the inner side of the metallic case is provided with a control board having a control circuit provided with a CPU for controlling the rotation torque of the motor, and a power module having an inverter element,

wherein the control circuit portion is fixed to the caliper in a state in which the concavity of the metallic case faces the caliper,

wherein, the control board and the power module provided in the inner side of the metallic case have the power module disposed in the metallic case side, and have the control board disposed in the side of the caliper, and moreover, a resinous wall is disposed in the inner side of the metallic case,

wherein a plurality of wirings for connection of the control board and the power module are buried in the resinous wall, and

wherein the power module is controlled by the control signal outputted from the control circuit of the control board so that the torque of the motor is controlled, and based on the rotation torque generated by the motor, the external and inner side brake pads depress the braking surface of the disc rotor by the conversion mechanism.