Punch press hydraulic servo device using a rotary valve
AssigneesAmada Engineering Center Co., Ltd., Kinshiro Naito, Amada Company, Limited
InventorsKinshiro Naito, Masayuki Shimizu, Hideo Hara, Osamu Takahashi
Life of this patent
Estimating the term…
Abstract
In a rotary servo valve (1) provided with at least two kinds of pump port (33, 39) for high and low pressures, a spool (11) that is free to rotate and free to reciprocate linearly is installed into a spool guide hole (7) of the valve main body (9), a servo motor (15) that rotates and drives the spool and a linear type actuator (13) that reciprocatedly travels are disposed, and the pump ports are selectively changed over by the reciprocation of the spool, and cylinder ports are selectively changed over by the rotation and at the same time the flow rate is controlled.
Claims12
A rotary servo valve comprising:
- a valve main body (303) provided with a plurality of intake ports (P11, P12) for taking in a plurality of pressure fluids which have pressures different to one another and a plurality of supply ports (A, B) for supplying a plurality of pressure fluids taken in to the desired drives;
- a first rotating spool (307) that has a hollow, and is installed to be inserted into the valve main body (303) while being free to rotate, and selectively allows one of the plurality of intake ports (P11, P12) to communicate with the hollow;
- a first rotating actuator (313) for rotating the first rotating spool (307);
- a second rotating spool (309) that has a hollow, and is installed to be inserted into the valve main body (303) while being free to rotate, and selectively allows one of the plurality of supply ports (A, B) to communicate with the hollow;
- and
- a second rotating actuator (317) for rotating the second rotating spool (309),
- wherein the valve main body (303) has a connection passage (339) that interconnects pressure fluids in the hollows of the first and the second rotating spools (307, 309).
A rotary servo valve comprising:
- a valve main body (365) provided with a plurality of intake ports (P11, P12) for taking in a plurality of pressure fluids which have pressures different to one another and a plurality of supply ports (A, B) for supplying a plurality of pressure fluids taken in to the desired drives;
- a first sliding spool (369) that has a hollow, and is installed to be inserted into the valve main body (365) while being free to reciprocate, and selectively allows one of the plurality of intake ports (P11, P12) to communicate with the hollow;
- a first sliding actuator (373) for sliding the first sliding spool (369);
- a second sliding spool (371) that has a hollow, and is installed to be inserted into the valve main body (363) while being free to reciprocate, and selectively allows one of the plurality of supply ports (A, B) to communicate with the hollow;
- and
- a second sliding actuator (377) for sliding the second sliding spool (371),
- wherein the valve main body (365) has a connection passage (387) that interconnects pressure fluids in the hollows of the first and the second sliding spools (369, 371).
A rotary servo valve comprising:
- a valve main body (303) provided with a plurality of intake ports (P11, P12) for taking in a plurality of pressure fluids which have pressures different to one another and a plurality of supply ports (A, B) for supplying a plurality of pressure fluids taken in to the desired drives;
- a rotating spool (307) that has a hollow, and is installed to be inserted into the valve main body (303) while being free to rotate, and selectively allows one of the plurality of intake ports (P11, P12) to communicate with the hollow;
- a rotating actuator (313) for rotating the rotating spool (307);
- a sliding spool (371) that has a hollow, and is installed to be inserted into the valve main body (303) while being free to reciprocate, and selectively allows one of the plurality of supply ports (A, B) to communicate with the hollow;
- and
- a sliding actuator (377) for rotating the sliding spool (371),
- wherein the valve main body (303) has a connection passage (339) that interconnects pressure fluids in the hollows of the sliding spool (371) and the rotating spool (307).
Dependencies are inferred from the claim text.