Hydraulic circuit for steering control in articulate vehicles
AssigneeKabushiki Kaisha Komatsu Seisakusho
InventorsKenzo Hoashi, Nobuaki Inaba
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Abstract
A hydraulic circuit for steering control in articulate vehicles which comprises an engine, a fixed displacement pump driven by the engine, a variable displacement pump driven by the engine, an exit port of the variable displacement pump being connected to a control valve of a steering actuator, an orifice provided at an outlet side of the fixed displacement pump and, a controlling cylinder connected to the variable displacement pump for controlling displacement of the variable displacement pump, the controlling cylinder being actuated by a spring disposed therein and a differential hydraulic pressure at the orifice.
Claims3
A hydraulic circuit for steering control in articulate vehicles including a prime mover said circuit comprising:
- a fixed displacement pump driven by said prime mover, the output of said fixed displacement pump being directly proportional to the speed of said prime mover;
- a variable displacement pump driven by said prime mover, the output of said variable displacement pump being connected to a control valve of a steering actuator;
- control cylinder means including a piston rod for controlling displacement of said variable displacement pump and a spring acting on said piston rod, said control cylinder means being connected to the fixed displacement pump through a first pipe;
- restricting means having one side connected to the output of said fixed displacement pump through a branch pipe from said first pipe;
- a reservoir coupled to the other side of said restricting means;
- wherein said control cylinder means is actuated by the force of said spring and an opposite force resulting from a differential hydraulic pressure at said restricting means and whereby the output of said variable displacement pump is held constant irrespective of the speed of said prime mover;
- and
- linkage means interconnecting said variable displacement pump and the piston rod of said control cylinder means.
Dependencies are inferred from the claim text.