| 摘要 |
PROBLEM TO BE SOLVED: To reduce energy loss and increase a responsibility to steering operation. SOLUTION: A variable displacement pump l provided with a rotor 3 and a cam ring 4 is provided. Also a pair of hydraulic oil pressure circuits 57 and 58a to interconnect a pair of ports 16 to supply and discharge hydraulic oil to a pair of hydraulic oil chambers 53 and 54 of a power cylinder 51 are provided in the variable displacement pump 1. Then a control device 18 which is provided with a pair of solenoids 25 and 26 driven by a steering torque and a pair of control oil chambers 21 and 22 is provided, and a pair of control hydraulic pressure circuits 59 and 60 to interconnect the control oil chambers 21 and 22 of the control device 18 to the hydraulic oil pressure circuits 57 and 58 are provided. Thus the cam ring 4 is oscillated by a steering force of the solenoids 25 and 26 and the control hydraulic pressure led into the control device 18 so as to vary an eccentric amount between the rotor 3 and the cam ring 4 of the variable displacement pump 1 and vary the suction and delivery amounts of oil. Thus a steering assisting face can be obtained. |
