Patent ID: 8103192
Filing Date: 2012-01-24
Classification: F16D,G03G,Y10T

Abstract:
1. A constant velocity joint, comprising: an outer ring including an annular space with an open end, plural outer grooves axially extending in an outer wall of the annular space and being equally spaced from each other in a circumferential direction, and plural inner grooves axially extending in an inner wall of the annular space and facing the respective outer grooves; and a cage configured to hold balls that slide along the inner walls and the outer walls; wherein the outer ring and/or the cage is made of a synthetic resin; wherein a drive force of one of the cage and the outer ring is transmitted to the other one of the cage and the outer ring when part of the cage is inserted in the annular space and the balls held by the cage are engaged in the inner grooves and the outer grooves; wherein the inner wall includes an extension portion extending from open-side end points of the inner grooves toward the cage; wherein inner wall tapered portions extending from the open-side end points of the corresponding inner grooves toward an open end of the inner wall are formed in the extension portion such that a diameter of the annular space and a groove width of the inner wall tapered portions increase from the open-side end points of the inner grooves toward the open end of the inner wall; wherein the outer wall includes another extension portion extending from the open-side end points of the outer grooves toward the cage; wherein outer wall tapered portions extending from the open-side end points of the corresponding outer grooves toward an open end of the outer wall are formed in the extension portion such that an outer diameter of the annular space increases from the open-side end points of the outer grooves toward the open end of the outer wall; wherein the open-side end points of the inner grooves are closer to the open end of the annular space than the open-side end points of the outer grooves; and wherein an inclination angle of the outer wall tapered portions relative to an opening surface of the annular space is greater than an inclination angle of the inner wall tapered portions relative to the opening surface of the annular space.