Brakes – Operators – Electric and mechanical
Reexamination Certificate
2007-11-27
2007-11-27
Schwartz, Christopher P. (Department: 3683)
Brakes
Operators
Electric and mechanical
C188S162000
Reexamination Certificate
active
10778616
ABSTRACT:
An object of the present invention is to provide an electric disc brake apparatus having a simple constitution in which the operating condition of a parking brake can be reliably detected. A controller detects the operating condition (steps S25, S26) of a solenoid for driving a parking brake locking mechanism (holding mechanism) by means of a motor current (step S24). As a result, a state in which thrust generated by the motor (first electric actuator) is maintained by the parking brake locking mechanism, and accordingly the operative and inoperative states of the parking brake can be understood easily. Further, detection of the motor current is performed using a current sensor that is also used to realize a function of the motor (a function for moving brake pads toward a disc rotor), and hence separate current detection means need not be provided. Accordingly, the operative or inoperative state of the parking brake can be understood by means of a simple constitution, enabling a reduction in the cost of the apparatus.
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Yamaguchi Tohma
Yamamura Takeshi
Brinks Hofer Gilson & Lione
Kabushiki Kaisha Hitachi Seisakusho
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