| 摘要 |
PROBLEM TO BE SOLVED: To prevent the breakage in the elongation stroke of a seal material which seals an annular oil chamber, in an opening portion on the inner periphery of an outer tube. SOLUTION: In this hydraulic shock absorber 10, an outside operating oil chamber 20 in an inner tube 12 is communicated with a piston rod side oil chamber 21A in a cylinder 18 via an upper throttle hole 27, and the outside operating oil chamber 20 in the inner tube 12 is communicated with a piston side oil chamber 21B in the cylinder 18 via a lower throttle hole 28. In the elongation stroke, the upper throttle hole 27 is more strongly throttled than the lower throttle hole 28. COPYRIGHT: (C)2009,JPO&INPIT
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