| 摘要 |
PROBLEM TO BE SOLVED: To automatically compensate a part of the change of viscosity of working fluid by making clearance smaller as higher a temperature of the working fluid is, and to achieve suitable cushioning action even when a frequency of adjustment of a cushion valve is reduced. SOLUTION: A material having a relatively large coefficient of thermal expansion is used for a part constituting an outer peripheral surface 15 of a cushion boss 14, a material having a relatively small coefficient of thermal expansion is used for a part constituting an inner peripheral surface 33 of a cushion ring 31, and the clearance is smaller as higher the temperature of the working fluid is by the difference of the coefficients of thermal expansion of the two parts. COPYRIGHT: (C)2007,JPO&INPIT
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