| 摘要 |
PROBLEM TO BE SOLVED: To save energy at low cost in simple structure on a motive power steering device. SOLUTION: A hydraulic pump 3 to be driven through a clutch 60 by a driving source of a vehicle is provided, and hydraulic oil discharged from thins hydraulic pump 3 is supplied to a power cylinder 5 through a center closed type control valve 6. Hydraulic oil derived from an oil chamber on the high pressure side of the power cylinder 5 at the time of steering is introduced to an oil chamber 67 of a second plunger 65 through an oil introduction passage 51 for clutch connection, and the clutch 60 is connected to it. Hydraulic oil discharged from the hydraulic pump 3 at the time of non-steering is introduced to an oil chamber 66 of a first plunger 64 through a change-over valve 24 and an oil introduction passage 22 for clutch cutting, and the clutch is disconnected. |
