Double Hooke's Type CV Joint
Double Hooke's Type CV Joint One method of obtaining very near constant velocity characteristics is to position two Hooke's joints back to back so that their yoke arms remain in line with one another (Fig. 26.12). Fig. 26.12. Double Hooke's type constant velocity joint. After assembly, both pairs of outer yoke arms must be at right angles to the arms of the central double yoke member. This double joint combination can be considered in two stages. The first stage hinges the drive yoke and driven central double yoke together, and the second stage links the central double yoke (now drive member) to the driven final output yoke. Consequently, the second stage drive half of the central double yoke is placed a quarter of a revolution out of phase with the first stage drive yoke (Fig. 26.13). Fig. 26.13. Double Hooke's type joint shown in two positions 90 degrees out of phase. Therefore, if the input and output shafts are inclined to each other and the first stage driven cent