| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a hydraulic jack enabling smooth movement of an accumulator piston. SOLUTION: An accumulator cylinder 15 and the accumulator piston 18 for accumulating the hydraulic pressure generated inside a cylinder main body 1 from the weight of a load 44 connected to the top of a ram 3 are mounted on the outer periphery of the cylinder main body 1. The accumulator piston 18 is divided into a first piston 18a slidably abutting to the outer surface of the cylinder main body 1 and a second piston 18b slidably abutting to the inner surface of the accumulator cylinder 15, and the first and second pistons 18a and 18b are connected to each other in such a way that the pistons are relatively movable in the radial direction of the accumulator cylinder 15. Therefore, if the cores of the cylinder main body 1 and the accumulator cylinder 15 are deviated from each other or there is unevenness in the precision in the work on the outer surface of the cylinder main body 1 and the inner surface of the accumulator cylinder 15, the first and second pistons 18a and 18b are relatively moved to absorb the core deviation or the unevenness, so that the accumulator piston moves smoothly. As a result, the position energy of the load 44 can be accumulated without loss.</p> |
