Motion conversion system |
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| 申请号 | US3577732D | 申请日 | 1969-05-19 | 公开(公告)号 | US3577732A | 公开(公告)日 | 1971-05-04 |
| 申请人 | SHELL OIL CO; | 发明人 | HAAS JACOBUS DE; | ||||
| 摘要 | A system for the conversion of the rotary movement of a shaft into a corresponding displacement of an element such as a moving element of a control valve. | ||||||
| 权利要求 | 1. A system for converting rotary movement of a shaft into a corresponding displacement of an element, said system comprising, in combination: a reversible hydraulic pump coupled to said shaft and having an inlet and an outlet; a hydraulic motor provided with at least one pressure cylinder having an inlet and a displaceable element operatively associated with said pressure cylinder; and hydraulic valve means including a valve having an inlet in communication with said pump outlet and an outlet in communication with said motor inlet, said valve means being adapted to open said valve both if the pump pressure exceeds the pressure prevailing at the outlet of said valve and at a pump pressure lower than a predetermined reference pressure and closed at other pressures. 2. The system of claim 1 wherein said hydraulic motor is a linear hydraulic motor with said displaceable element being coupled to a slidable element capable of effecting a linear displacement. 3. The system of claim 1 wherein said hydraulic valve means includes a diaphragm communicating on one side with the open atmosphere and on the other side with the pump pressure, said diaphragm being provided with means for opening a valve body in the valve against the pressure prevailing in the hydraulic motor as soon as the pump pressure falls below the atmospheric pressure. 4. The system of claim 3 wherein said means for opening a valve body includes a plunger coupled to said diaphragm capable of forcing the valve body from a valve seat. 5. The system of claim 1 wherein said displaceable element comprises a piston movable by the hydraulic pressure in a linear direction against the action of an associated spring in said cylinder, said piston being provided with means for the direct actuation of other elements. 6. The system of claim 1 wherein the inlet of the pump is connected to a storage vessel for hydraulic liquid. 7. The system of claim 1 wherein the pump is a positive displacement pump having an artificial leak passage arranged between the inlet and the outlet of the pump. |
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