| 摘要 |
A space (32) is formed between an inner end of a fitting hole (31) formed in a piston (21) and a piston rod (22) and is positioned radially inside a sealing member (24). By circulating a cooling fluid through the space, the majority of heat which is transmitted to the piston rod (22) can be absorbed, preventing transmission of heat to the sealing member. The temperature of the sealing member is kept lower and its deterioration can be inhibited.
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