Patent ID: 6820876
Filing Date: 2004-11-23
Classification: F16D,F16J,Y10S

Abstract:
A boot for a universal joint for coupling an input-side shaft to an output-side shaft of the type in which one end of the boot is fitted on one shaft of both the shafts via its one-end fitting portion and the other end of the boot is fitted on the other shaft of both the shafts via its other-end fitting portion to cover the universal joint, comprising;one-end fitting portion of the boot having an annular lip portion, the one-end fitting portion and the annular lip portion each having a partial passage, the partial passage including an annular partial passage extending in a circumferential direction of the one-end fitting portion or the annular lip portion, the partial passages being arranged and constructed to communicate with each other to form a passage for making an inside region of the boot communicate with an outside region of the boot, wherein the annular partial passage communicates with the partial passage formed on the annular lip portion at a plurality of predetermined positions in the circumferential direction of the annular partial passage and hence the partial passage formed on the annular lip portion having a plurality of partial passages.