Four wheel steering system

专利名称：Four wheel steering system

发明人：David A. Janson,Jerome V. Glinski, Jr.,David

M. Preston

申请号：US07/3413申请日：190612公开号：US04966246A公开日：19901030

摘要：A closed hydraulic system (22) is provided for transmitting steering movementto a rear wheel steering assembly (16) in response to steering movement of a frontwheel steering assembly (14). The front wheel steering assembly is controlled by asteering wheel (18) and a power steering assembly (20). The closed hydraulic system (22)includes a pump assembly (56) and an actuator assembly (58) connected together byconduits (60,62) to define closed fluid flow branches (1,166) for moving a piston (112) inthe actuator assembly in response to movement of a piston (78) in the pump assembly.Movement of the actuator piston is transmitted to the rear wheel steering assembly viafirst and second cam assemblies (122,124) which effect same direction rear wheel steeringfor rather small front wheel steering angles and which effect opposite direction rearwheel steering for greater front wheel steering angles. Pump assembly (56) includes firstand second neutral valves (92,94) for intercommunicating opposite sides of the pumppiston (78) with a chamber ( 83) when the piston is in a neutral position. System (22) alsoincludes a reservoir (68) disposed above the normal fluid level of the system andexposed to atmospheric pressure.

申请人：EATON CORPORATION

代理人：P. S. Rulon

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