Electric power steering device
First Claim
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1. An electric power steering device for an automobile having a steering system including a steering mechanism accommodated in a rack housing, the electric power steering device comprising:
- an output shaft coupled to the steering mechanism;
a motor which assists in applying torque to the steering mechanism via said output shaft;
a control circuit which controls the motor; and
a motor housing which accommodates the motor and the control circuit, the motor and the control circuit with the motor housing being arranged in thermal contact with the rack housing;
wherein said motor housing comprises an end frame having the motor and the control circuit assembled thereonto, and a cup-shaped motor case covering the motor and the control circuit and hermetically coupled to the end frame, the end frame being fixed to the rack housing.
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Abstract
An electric power steering device includes an output shaft connected to a steering mechanism of a steering system for power assisting the steering operation. The EPS includes a motor and a control circuit accommodated in a common motor housing. The motor housing comprises an end frame and a cup-shaped motor case hermetically covering the motor and the control circuit. The end frame is secured to a rack housing accommodating the steering mechanism, so that heat generated by the motor and the control circuit is transmitted to the rack housing.
54 Citations
20 Claims
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1. An electric power steering device for an automobile having a steering system including a steering mechanism accommodated in a rack housing, the electric power steering device comprising:
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an output shaft coupled to the steering mechanism; a motor which assists in applying torque to the steering mechanism via said output shaft; a control circuit which controls the motor; and a motor housing which accommodates the motor and the control circuit, the motor and the control circuit with the motor housing being arranged in thermal contact with the rack housing; wherein said motor housing comprises an end frame having the motor and the control circuit assembled thereonto, and a cup-shaped motor case covering the motor and the control circuit and hermetically coupled to the end frame, the end frame being fixed to the rack housing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electric power steering device for an automobile having a steering system including a steering mechanism accommodated in a rack housing, the electric power steering device comprising:
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an output shaft coupled to the steering mechanism; a motor which assists in applying torque to the steering mechanism via said output shaft; a control circuit which controls the motor; and a motor housing which accommodates the motor, the control circuit being attached to the motor housing in a side-by-side relationship with the motor, the motor and the control circuit with the motor housing being arranged in thermal contact with the rack housing. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification