Title:
【発明の名称】増速スピンドル装置
Document Type and Number:
Japanese Patent JP2893075
Kind Code:
B2
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.
Inventors:
UEDA KOICHI
TAKEBAYASHI HIROAKI
ROTSUKAKU KAZUO
TAKEBAYASHI HIROAKI
ROTSUKAKU KAZUO
Application Number:
JP14139588A
Publication Date:
May 17, 1999
Filing Date:
June 08, 1988
Export Citation:
Assignee:
KOYO SEIKO KK
SEIWA SEIKI KK
SEIWA SEIKI KK
International Classes:
B23Q5/04; F16H13/06; (IPC1-7): B23Q5/04
Domestic Patent References:
| JP6389245A | ||||
| JP6116243U | ||||
| JP60103725U |
Attorney, Agent or Firm:
Kazuhide Okada