Friction gear transmission systems or components – Friction gear includes idler engaging facing concave surfaces – Toroidal
Patent
1998-11-12
2000-06-06
Herrmann, Allan D.
Friction gear transmission systems or components
Friction gear includes idler engaging facing concave surfaces
Toroidal
384 49, 464167, 476 40, F16H 1526, F16C 2904
Patent
active
060712104
ABSTRACT:
The ball spline for use in a troidal-type continuously variable transmission comprises a plurality of spline grooves and a plurality of balls which are arranged in series within spline gaps each constituted by a set of mutually opposing spline grooves, in which, while allowing the movement of the input disc in the direction of an input shaft by means of contact between the spline gaps and balls, the input shaft and input disc can be drivingly connected to each other. In the ball spline, the number of spline gaps is set different from integral multiples of the number of power rollers which are held by and between the input and output discs in contact with the two discs in order to transmit a rotation torque between the input and output discs. Further, each of the spline grooves includes inner and outer peripheral surface side spline grooves, and the shape of each of the sections of the two inner and outer peripheral surface side spline grooves respectively forming the ball spline is formed as a Gothic arch shape. And, the radius of curvature of the section of the groove bottom portion arc surface forming the groove bottom portion of each of the spline grooves is set more than or equal to 15% of the diameter of the ball. Also, the outer peripheral surface side chamfers of the outer peripheral surface side spline groove are set smaller to thereby be able to secure the effective grinding surface of the outer peripheral surface side spline groove.
REFERENCES:
patent: 5027669 (1991-07-01), Nakano
patent: 5190378 (1993-03-01), Tanaka
patent: 5299988 (1994-04-01), Fukushima et al.
patent: 5362156 (1994-11-01), Hara
patent: 5569112 (1996-10-01), Fukushima
Fujinami Makoto
Goto Nobuo
Imanishi Takashi
Kato Hiroshi
Machida Hisashi
Herrmann Allan D.
NSK Ltd.
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