CONSTANT-VELOCITY JOINT

摘要

In a constant-velocity joint, an inner member thereof includes holders that serve to retain respective roller assemblies. When each of the holders is hypothetically divided into three equal parts made up of a proximal end portion, an intermediate portion, and a distal end portion from a side of an annular member, an inner wall surface of an inner roller of the roller assembly contacts only a side wall surface of the proximal end portion. The inner roller preferably has an inside diameter, which is minimum at a contact point that contacts the side wall surface of the proximal end portion. More specifically, the inside diameter of the inner roller gradually expands in diameter from the contact point to a side that faces toward the annular member, and further, gradually expands in diameter from the contact point to a side that faces toward the distal end portion.

主权项

1. A constant-velocity joint interposed between a first transmission shaft and a second transmission shaft, the constant-velocity joint being configured to transmit rotary drive power from the first transmission shaft to the second transmission shaft, comprising:
an outer member coupled to the first transmission shaft, the outer member having a plurality of guide grooves defined in a side wall surface of the outer member, the guide grooves being spaced at prescribed intervals from each other and extending in an axial direction of the outer member; an inner member having an annular member and a plurality of holders, which project from the annular member respectively into the guide grooves, the annular member having an insertion hole, the second transmission shaft being inserted through the insertion hole, the inner member being inserted into the outer member; and a plurality of roller assemblies mounted respectively on the holders, the roller assemblies being configured to rotate inside of the guide grooves; wherein each of the roller assemblies includes an inner roller, and an outer roller mounted externally of the inner roller through rolling members; and wherein, in a case where each of the holders is divided into three equal parts made up of a proximal end portion, an intermediate portion, and a distal end portion, from a side in proximity to the annular member toward a side distanced from the annular member, an inner wall surface of the inner roller contacts only a side wall surface of the proximal end portion.