Patent ID: 6684990
Filing Date: 2004-02-03
Classification: B60G,F16F

Abstract:
A tube structure for a hydraulic damper of a double tube structure including an outer tube and an inner tube,wherein the outer tube and the inner tube are separately formed by extrusion, ribs are integrally formed on one of an inside wall of the outer tube and an outside wall of the inner tube, and a prescribed gap exists between an inside diameter of the ribs at an inner circumferential wall of the outer tube and an outside diameter of the inner tube, or between an outside diameter of the ribs at an outer circumferential wall of the inner tube and an inside diameter of the outer tube, and the inner tube is inserted inside the outer tube with said gap in between, the outer tube reduced in diameter to compression-join the ribs at the inner circumferential wall of the outer tube onto the outer circumferential wall of the inner tube, or to compression-join the ribs at the outer circumferential wall of the inner tube onto the inner circumferential wall of the outer tube, whereby the outer tube and the inner tube are integrally joined.