Automatic steering gear

申请号 JP7569585 申请日 1985-04-09 公开(公告)号 JPS61166775A 公开(公告)日 1986-07-28
申请人 Kamizaki Kokyu Koki Seisakusho Kk; 发明人 MATSUFUJI MIZUYA;
摘要 PURPOSE:To improve adaptability in automatic steerage, by operating an automatic steering control valve in time of automatic steering control, while using a steering clutch and a steering brake both jointly for combined operation, and controlling a brake with a low pressure relief valve. CONSTITUTION:An automatic steering control valve A.S.V is selected to each of right brake, neutral and left brake positions according to an output signal out of a steering sensor 54. Discharge pressure out of a pump 42 passing through this control valve A.S.V operates two valve spools 51 and 75 of a steering clutch valve and selects this valve. Therefore, the discharge pressure of the pump 42 operates either of actuators 14 of symmetrical brakes, while discharge pressure out of a pump 43 operates either of actuators 15 of symmetrical clutches. At this time, brake pressure is limited to the specified one by a variable relief valve 79. When there is no signal out of the sensor 54, the control valve A.S.V is operated by a fine adjustment steering lever 52.
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