Patent ID: 7621383
Filing Date: 2009-11-24
Classification: F16F

Abstract:
1. A double tube hydraulic shock absorber comprising: an outer tube; an inner tube provided in an interior of, and concentrically with, the outer tube; a base valve having a leg portion on a base end side thereof, the base valve being fitted and fixed to a base end of the inner tube; a lower cap provided so as to contact the leg portion and seal a base end of the outer tube in an oil tight fashion; a piston rod inserted into the inner tube so as to be capable of an axial reciprocation; and a guide member attached to a top side of the outer tube and the inner tube so as to support the piston rod and apply an axial force on the inner tube toward the base end of the inner tube, wherein: the leg portion has an inclined portion on its lower surface, and the lower cap has an inclined portion on its upper surface; and the inclined portion of the leg portion includes a contact portion and a remaining portion, the contact portion is formed directly under the base end of the inner tube in an axial direction of the inner tube and does not extend beyond an area directly under the base end of the inner tube, and the contact portion only contacts the inclined portion of the lower cap, while the remaining portion is spaced apart from the inclined portion of the lower cap with a gap being formed therebetween.