| 摘要 |
PROBLEM TO BE SOLVED: To realize a large steering force without increasing a diameter of a cylinder tube nor increasing strength of the cylinder tube. SOLUTION: A first piston P1 arranged between a first partition wall member A and a third partition wall member C and a second piston P2 arranged between a second partition wall member B and the third partition wall member C are fixed to a rod 15. This power steering device comprises: a first pressure chamber 31 formed by coupling the first piston P1 and the first partition wall member A; a second pressure chamber 32 formed by coupling the first piston P1 and the third partition wall member C; a third pressure chamber 33 formed by coupling the second piston P2 and the third partition wall member C; and a fourth pressure chamber 34 formed by coupling the second piston P2 and the second partition wall member B. When a control valve V is switched to one side, pressure oil is supplied to the first and the third pressure chambers 31 and 33, and when the control valve V is switched to the other side, the pressure oil is supplied to the second and the fourth pressure chambers 32 and 34.
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