| 摘要 |
A hydraulic control unit of an electronically controlled hydraulic brake system has a housing ( 49 ) accommodating a pump ( 35 ) and at least one low-pressure accumulator. The low-pressure accumulator is positioned in a location at a lower height than the cam cavity ( 51 ) of the pump ( 35 ), and a drainage bore ( 53 ) connects the cam cavity ( 51 ) with the spring chamber ( 68 ) of at least one of the low-pressure accumulators. This allows the drainage of brake fluid from the cam cavity ( 51 ) into the spring chamber ( 68 ) solely by way of gravity. Thus this measure eliminates the risk of damage to the pump motor in the event that ambient water penetrates the cam cavity ( 51 ), which might flush brake fluid from the cam cavity 51 into the housing ( 49 ) of the pump motor.
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