| 摘要 |
a cylindrical separate wall projecting from the top to the center of a cylinder body in the lengthwise direction to form first and second cylinders; an annular space formed between integrally associated first and second pistons for the separate wall to be inserted therebetween; a flow path port for closing or opening the flow path formed in the first piston; a support connected to a push load at the back of the first and second pistons and pushing the first and second pistons forward; and an oil passage formed between the support and the first and second pistons for supplying the oil from the oil tank to the flow path of the first piston.
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