Patent ID: 6293873
Filing Date: 2001-09-25
Classification: F16D,F16J

Abstract:
A universal joint comprising:an inner element and an outer element which are assembled with each other; anda boot which has one end fitted to said inner element and the other end fitted to said outer element so as to seal between said inner element and said outer element,wherein a communication passage which causes insides of said boot and the open air to communicate with each other until said outer element is positioned at a position near a fitting operation completing position from a fitting operation starting position, and which shuts communication with the insides of said boot and the open air when said outer element is positioned at the fitting operation completing position from said position near the fitting operation completing position which is formed in a fitting portion between said outer element and said boot,said boot is provided with a flexible boot main body which is fitted to said inner element, and is made of an elastic material, an adapter which is fitted to said outer element, and said communication passage is formed by a communication groove which is formed in said adapter.