Patent ID: 8747236

Claim:
A constant velocity joint comprising at least: a first shaft ( 2 ) rotating about a first rotation axis (X 1 ); a second shaft ( 3 ) rotating about a second rotation axis (X 2 ), the first rotation axis (X 1 ) and the second rotation axis (X 2 ) intersect at a center ( 4 ) of the joint which is a point fixed relative to the first shaft ( 2 ) and relative to the second shaft ( 3 ); a triad of yokes ( 5 ) comprising a control yoke ( 6 ), a first shaft yoke ( 7 ) and a second shaft yoke ( 8 ), the first shaft yoke ( 7 ) being pivotally mounted on the first shaft ( 2 ) with the respective first pivot axis (A 1 ) passing from the center ( 4 ) of the joint and being oblique to the first rotation axis (X 1 ), the second shaft yoke ( 8 ) being pivotally mounted on the second shaft ( 3 ) with the respective second pivot axis (A 2 ) passing from the center ( 4 ) of the joint and being oblique to the second rotation axis (X 2 ), the angle between the first pivot axis (A 1 ) and the first rotation axis (X 1 ) equals the angle between the second pivot axis (A 2 ) and the second rotation axis (X 2 ), the three yokes of the triad of yokes ( 5 ) being pivotally mounted to each other to pivot about a common axis (C) passing from the center ( 4 ) of the joint; a set of additional pivotally mounted yokes ( 9 ) providing support to the control yoke ( 6 ), the set of additional pivotally mounted yokes ( 9 ) being a spherical pantograph mechanism pivotally mounted at one end ( 10 ) on the first shaft ( 2 ), the set of additional pivotally mounted yokes ( 9 ) being pivotally mounted at its other end ( 12 ) on the second shaft ( 3 ), the set of additional pivotally mounted yokes ( 9 ) being pivotally mounted at its center ( 14 ) on the control yoke ( 6 ) so that the transmission ratio between the first shaft ( 2 ) and the second shaft ( 3 ) of the constant velocity joint ( 1 ) remains strictly at 1:1.