公开(公告)号：EP1659047A1

公开(公告)日：2006-05-24

申请号：EP04772066.9

申请日：2004-08-24

申请人： Koyo Seiko Co., Ltd.

发明人： HIRAKUSHI, Shuzo, c/o KOYO SEIKO CO., LTD. ,  SANO, Osamu, c/o KOYO SEIKO CO., LTD. ,  UOTA, Masashi, c/o KOYO SEIKO CO., LTD. ,  SHINTOU, Hiroaki; c/o KOYO SEIKO CO., LTD. ,  KOTAKE, Yoshimi, c/o KOYO SEIKO CO., LTD.

IPC分类号： B62D5/07

CPC分类号： B62D5/065

摘要： A power steering unit capable of finely controlling the steering assistance power generated by a hydraulic actuator in accordance with the steering direction and driving condition without requiring a complex structure is provided at low cost.
The right steering assistance power generating state or the left steering assistance power generating state can be alternatively selected by switching the flow path of hydraulic fluid to the hydraulic actuator 10 for generating the steering assistance power with a motor-operated switching valve 23.
The switching valve 23 is controlled so that the steering assistance power acts in accordance with the determined steering direction, and an electric motor 22 for driving a pump 21 is controlled so that the pressure of the hydraulic fluid discharged from the pump 21 is varied in accordance with the determined driving condition.

摘要翻译： 能够以低成本提供能够根据转向方向和驾驶状况精细地控制由液压致动器产生的转向辅助动力而不需要复杂结构的动力转向单元。 通过用电动切换阀23将液压流体的流路切换到用于产生转向辅助动力的液压致动器10，可以选择正确的转向辅助发电状态或左转向辅助发电状态。切换阀 23被控制成转向辅助动力根据所确定的转向方向作用，并且控制用于驱动泵21的电动机22，使得从泵21排出的液压流体的压力根据确定的 驾驶条件。