CONSTANT VELOCITY JOINT ASSEMBLY AND BOOT OF CONSTANT VELOCITY JOINT ASSEMBLY

PROBLEM TO BE SOLVED: To provide a constant velocity joint assembly preventing external water from entering a boot in adjusting pressure inside the boot, and a boot thereof.SOLUTION: A constant velocity joint assembly 5 includes a constant velocity joint 10, a shaft 20, and a boot 32. The boot includes: a large-diameter cylinder part 32a; a small-diameter cylinder part 32b fixed to the outer peripheral surface of the shaft; one or more communication passages provided in at least one of the small-diameter cylinder part and large-diameter cylinder part, and communicating between a grease storage space 50 and an outside space; an on-off valve provided in the communication passage, and opening/closing according to pressure in the grease storage space; and a waterproof ventilation membrane 37 provided so as to block an outside space side with the on-off valve in the communication passage, and configured to regulate passage of water between the outside space and the grease storage space to allow passage of air.SELECTED DRAWING: Figure 3 【課題】ブーツ内の圧力を調整する際、外部の水をブーツ内に進入させない等速ジョイント組立体及びそのブーツを提供する。【解決手段】等速ジョイント組立体５は、等速ジョイント１０と、シャフト２０と、ブーツ３２と、を備え、ブーツは、大径筒部３２ａと、シャフトの外周面に固定される小径筒部３２ｂと、小径筒部及び大径筒部の少なくとも一方に設けられ、グリス収容空間５０と外側空間とを連通する１以上の連通通路と、連通通路内に設けられ、グリス収容空間内の圧力に応じて開閉する開閉弁と、連通通路において開閉弁より外側空間側を塞ぐように設けられ、外側空間とグリス収容空間との間において水の通過を規制し空気の通過を許容する防水通気膜３７と、を備える。【選択図】図３