Patent ID: 8348774
Filing Date: 2013-01-08
Classification: F16D,F16J

Abstract:
1. A constant velocity joint for connection of a first and a second rotational shaft, the constant velocity joint comprising: a second rotational shaft; an outer joint member for being torque-transmittably joined to a first rotational shaft, the outer joint member including a boot attaching section, an inner joint member torque-transmittably joined to the second rotational shaft; a torque transmitting member interposed between the inner and outer joint members to transmit torque; and a thermoplastic elastomer boot mounted between the outer joint member and the second rotational shaft to prevent leakage of grease filled in the joint and to prevent foreign matter from intruding into the joint from the outside, wherein an outer peripheral surface of the boot attaching section of the outer joint member is non-cylindrical, with alternately disposed large and small diameter sections, wherein said boot includes a large end side attaching section adapted to fit on the boot attaching section of the outer joint member, a small end side attaching section adapted to fit on the second rotational shaft, and a bendable section between the large and small end side attaching sections, wherein said large end side attaching section of the boot is shaped such that its outer peripheral surface is circular and its inner peripheral surface extends along the outer peripheral surface of the boot attaching section of the outer joint member, and the whole of the large end side attaching section is filled with material, wherein the inner peripheral surface of the large end side attaching section of the boot includes alternately disposed thick-walled sections and thin-walled sections, wherein the inner peripheral surface of the large end side attaching section of the boot includes a projection, wherein the outer peripheral surface of the boot attaching section of the outer joint member has a boot groove and a projecting section positioned on an end surface side of the outer joint member, said projecting section being larger in diameter than said boot groove, said projecting section having a first slope surface gradually diametrically contracted in a direction leading away from an end surface of the outer joint member, and a second slope surface gradually diametrically expanded from the end surface, wherein an outer periphery of the large end side attaching section of the boot is formed with a clamp groove for receiving a boot clamp, wherein at least one of the thin-walled sections is formed with a chamfered section, a shoulder guard, a straight section between the chamfered section and the shoulder guard, and a cavity between the straight section and the shoulder guard, wherein at least one of the thick-walled sections is formed with a chamfered section and a straight section, wherein the cavity of the boot has a third slope surface and a fourth slope surface, and wherein the projection and cavity of the boot are positioned between the first edge and the second edge of the clamp groove in the axial direction of the boot.