Patent ID: 7240775
Filing Date: 2007-07-10
Classification: F16F

Abstract:
1. A shock absorber, comprising: an outer tube; an inner tube slidably disposed inside the outer tube; a cylinder disposed inside the inner tube; a rod entering inside the cylinder; a piston disposed in a tip end of the rod to slide on an inner surface of the cylinder, wherein the piston defines two chambers with the cylinder for producing a damping force; a rod guide portion, one end of which is fixed to an end of the cylinder, slidably supporting the rod; an oil lock case disposed in an end of the inner tube; and an oil lock piece disposed in the other end of the rod guide portion, wherein: an oil lock chamber is formed by the oil lock piece and the oil lock case, the oil lock chamber being filled with an operating oil when the shock absorber is at the maximum compression state to restrict a stroke of the shock absorber, wherein: wherein: when the shock absorber is at the maximum compression state, the operating oil at the high pressure in the oil lock chamber is sealed by the seal ring to prevent the operating oil at the high pressure in the oil lock chamber from acting on the oil seal, and an expansion-direction motion of the shock absorber away from the maximum compression state produces a clearance between the oil lock piece and the rod guide portion, whereby the operating oil flows into the oil chamber through the clearance.