Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
BALL SCREW
Document Type and Number:
Japanese Patent JPH08312744
Kind Code:
A
Abstract:

PURPOSE: To reduce a cost though a ball screw is constituted in such a manner that dusting is suppressed.

CONSTITUTION: In a ball screw A comprising a screw a shaft 1 having a lubrication film adhered to spiral grooves 11 and 21; a nut 2; and a plurality of balls 3, the ball 3 forms a sintered substance wherein silicon nitride powder with a average grain size of 0.2-1μm to which 5-20wt.% sintering assistant, such as Y2O3 and Al2O3, is added is sintered under a pressure of 1-10 atmospheric pressure. This constitution reduces a manufacturing cost compared with conventional high grade ceramics and besides may reduce density and strength to a slightly low value. Besides, since pore opened to the surface of a sintered substance is present, wear powder of the lubrication film is trapped by the pore and stored.


More Like This:
JPS6313956SCREW-DRIVEN FEEDER
JP5142536Actuator
JP2014043879BALL SCREW
Inventors:
TAKEBAYASHI HIROAKI
HAYASHIDA KAZUNORI
KITAMURA KAZUHISA
KIDA TAKEHISA
Application Number:
JP14569495A
Publication Date:
November 26, 1996
Filing Date:
May 19, 1995
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
KOYO SEIKO CO
International Classes:
F16H25/22; C04B35/584; F16H25/24; (IPC1-7): F16H25/22; C04B35/584; F16H25/24
Attorney, Agent or Firm:
Kazuhide Okada