Traction drive spindle device

Details Traction drive spindle device Traction drive spindle device

1989-05-30

1990-10-02

Braun, Leslie A.

Planetary gear transmission systems or components

Planet pinion is friction gear

408126, F16H 1306, B23B 3910

Patent

active

049604058

ABSTRACT:
A traction drive spindle device includes an input shaft connectable to a drive main shaft for rotation therewith. A hollow holder shaft is connected to an output end of the input shaft in coaxial relation thereto, the hollow holder shaft having a plurality of planetary rollers mounted thereon intermediate opposite ends of the holder shaft. A high-speed spindle is rotatably received in a bore of the hollow holder shaft, the high-speed spindle having an inner end portion which is received in the bore and serves as a sun shaft disposed in rolling contact with the planetary rollers. A housing is mounted on the outer periphery of the holder shaft through a first ball-and-roller bearing so as to be rotatable relative to the holder shaft, the housing having a fixed ring fixed to an inner periphery thereof. The planetary rollers are disposed in rolling contact with the fixed ring. A second ball-and-roller bearing is interposed between the holder shaft and the high-speed spindle. Only the balls and both the balls and the rollers of the second ball-and-roller bearing are made of ceramics.

REFERENCES:
patent: 3965773 (1976-06-01), Bert et al.
patent: 4491038 (1985-01-01), Kraus
patent: 4741650 (1988-05-01), Nakata
patent: 4792244 (1988-12-01), Yamashita et al.
patent: 4808014 (1989-02-01), Ueda et al.

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