Hydraulic pressure controlling device for intensifying cylinder |
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| 申请号 | US3754395D | 申请日 | 1971-11-10 | 公开(公告)号 | US3754395A | 公开(公告)日 | 1973-08-28 |
| 申请人 | MOCHIZUKI T; WATANABE M; | 发明人 | WATANABE M; MOCHIZUKI T; | ||||
| 摘要 | A relay piston for driving a pneumatic pressure controlling device for a servo motor is disposed at a position where it is displaced by hydraulic pressure in a low-pressure chamber connected to a master cylinder. A high-pressure chamber is formed in communication with the low-pressure chamber through a passage in the relay piston, the high-pressure chamber being connected to an intensifying cylinder. In the passage there is provided a valve adapted to intercept communication between the highpressure chamber and the low-pressure chamber in accordance with advancement of the relay piston. The force that is applied to the relay piston by hydraulic pressure in the high-pressure chamber, when the valve is closed, is the resultant of the force component acting to advance the relay piston which is greater than the force component acting to let the relay piston move forwardly. | ||||||
| 权利要求 | 1. A hydraulic pressure controlling mechanism, said mechanism comprising a low pressure chamber connected to a master cylinder and a high pressure chamber connected to an intensifying cylinder, a relay piston extending in both chambers for slidable displacement therein in forward and return directions, a pneumatic pressure controller for a servo motor which operates the intensifying cylinder, said pressure controller including means acted on by said piston for controlling operation of the servo motor, said relay piston being so disposed in the low pressure chamber such that the piston is displaced in forward direction by hydraulic pressure in said low pressure chamber, said relay piston having a passage therein providing communication between said high pressure chamber and said low pressure chamber, and a valve means in said passage for selectively intercepting communication between said high pressure chamber and said low pressure chamber in aCcordance with advancement of said relay piston in the forward direction, said relay piston having a first effective pressure-receiving area and a second effective pressure receiving area, the latter being larger than the former, both of said areas being exposed to pressure in the high pressure chamber such that a net force is applied to the relay piston to urge the relay piston in return direction. 2. A mechanism as claimed in claim 1, in which said relay piston has opposite ends, said low pressure chamber being formed adjacent one of the ends of the relay piston and said high pressure chamber being formed in the middle of said relay piston. 3. A mechanism as claimed in claim 2 wherein a valve chamber is provided in the passage connecting said low and high pressure chambers with each other, said valve means comprising a ball valve in said valve chamber and a valve spring acting on said ball valve in a direction to close said passage, and a stationary operative rod facing said ball valve to push said ball valve in a direction to open said passage when the relay postion assumes a normal inoperative position. 4. A mechansim as claimed in claim 1 in which said means of said pressure controller which is acted on by said piston includes a valve rod controlling pneumatic pressure for the servo motor, said relay piston having a forward end positioned in abutment with said valve rod. 5. A mechanism as claimed in claim 1 comprising a second of said relay pistons, both relay pistons being operatively associated with said pressure controller through said means thereof. 6. A mechanism as claimed in claim 5 wherein said means of said pressure controller which is acted on by both relay pistons includes a valve rod controlling pneumatic pressure for the servo motor, said relay pistons being positioned in abutment with said valve rod for individual operation therewith. 7. A mechanism as claimed in claim 1 comprising a common housing enclosing said chambers, said relay piston, and said pneumatic pressure controller. |
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