Patent ID: 6659243
Filing Date: 2003-12-09
Classification: F16F

Abstract:
A shaft seal part structure of a hydraulic shock absorber in which an inner cylinder being arranged in an inner side of an outer cylinder, a rod guide being arranged in an inner side of the inner cylinder, an oil seal for sealing the inner cylinder and the rod guide being attached in a sealing manner to an inner side of the outer cylinder, and a piston rod being inserted to the inner cylinder via the oil seal and the rod guide,the oil seal being provided with a seal core having a doughnut-like horizontal portion and a tubular portion extending downward from an outer periphery thereof being layered on an upper portion of the inner cylinder via the rod guide, the outer cylinder having an integral upper portion, a diameter of the upper portion of the outer cylinder being reduced toward the tubular portion of the oil seal, an inner periphery of the diameter reduced portion in the outer cylinder being closely attached to a seal member attached to the outer periphery of the tubular portion in the oil seal, and an annular groove is formed in a peripheral direction of a portion closely attached to the seal member of the tubular portion in the oil seal, where the diameter reduced portion of the outer cylinder presses the tubular portion of the oil seal downward, thereby holding the inner cylinder, the rod guide and the oil seal in an inner portion of the outer cylinder, wherein the outer cylinder is sealed.