Patent
1977-04-29
1979-01-02
Vlachos, Leonidas
90 4, F16D 318, B23F 522, B23F 908
Patent
active
041320905
ABSTRACT:
An improved drive shaft is disclosed of the type used in a rotary fluid pressure device including an input-output shaft and a gerotor gear set having an externally toothed member which orbits and rotates within an internally toothed member. Both the input-output shaft and the externally toothed member define straight internal splines, and the drive shaft includes a set of crowned, involute external splines at each end thereof, in engagement with the respective straight internal splines. The crowned external splines are hobbed with a hob on which the cutter teeth have a pressure angle .phi..sub.H greater than the primary pressure angle .phi..sub.S of the crowned splines. The increased pressure angle .phi..sub.H of the cutter teeth makes it possible to reduce the crown angle on the splines, while still maintaining the necessary clearance X between each external spline and the adjacent internal spline at any given axial distance Y along the external spline from the central plane. Reducing the crown angle makes it possible either to increase the length of the external splines for a given shank diameter, or to increase the shank diameter for a given spline length. In either case, the result is an increase in the torque carrying capacity of the shaft by a factor F, wherein F equals the ratio of sin .phi..sub.H /sin .phi..sub.S.
REFERENCES:
patent: 2731886 (1956-01-01), Saari
patent: 2744449 (1956-05-01), Belden et al.
patent: 2927510 (1960-03-01), Wildhaber
Eaton Corporation
Kasper Leslie J.
Vlachos Leonidas
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