| 摘要 |
<p>PURPOSE:To excellently correct an excess or lack of working oil due to leakage resulting from the reciprocating motion of an oil-hydraulic actuator by allowing the annular groove in each pneumatic hydraulic converter to communicate with a common oil storage tank. CONSTITUTION:Pneumatic hydraulic converters 4A and 4B, which connect their oil flowing-in and -out ports 6A and 6B through passages 5A and 5B to reciprocating chambers 3A and 3B of an oil-hydraulic actuator 1 respectively, slidably contain moving members 7A and 7B having irregular diameters which divide oil chambers 8A and 8B having small diameters and air chambers 9A, 10A, 9B and 10B having large diameters. Annular grooves 11A and 11B, which are formed by enlarging the diameters of the holes between these oil chambers 8A, 8B and air chambers 10A, 10B into which the small diameter portions of the moving members are inserted, are provided so as to communicate with the oil chambers 8A and 8B respectively when the moving members 7A and 7B have moved to the moving end on the opposite side to the oil chambers 8A and 8B. Moreover, an oil storage tank 12 is communicated through passages 13A and 13B with the annular grooves 11A and 11B.</p> |
