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Patent Searching and Data


Title:
FEED SCREW MECHANISM OF ELECTRIC MOTOR
Document Type and Number:
Japanese Patent JP2012189098
Kind Code:
A
Abstract:

To provide a feed screw mechanism of an electric motor capable of eliminating characteristic reduction in position control of a motor caused by viscosity of oil.

A shaft 32 for constituting the feed screw mechanism 1 of the electric motor is formed of metal, and a male screw 42 is formed on its peripheral surface. An out-fitting part 14 for constituting the feed screw mechanism 1 of the electric motor is formed of resin, and a female screw 43 is formed on its inner peripheral surface. An oil releasing groove 91 extending in the axial direction is arranged on a screw forming surface for forming the male screw 42, and one end of the oil releasing groove 91 is opened on a base end surface 93 of the shaft 32. Thus, a communicating space 101 communicating in the axial direction between the shaft 32 and the out-fitting part 14 is formed of the oil releasing groove 91, and the communicating space 101 is opened on the base end side of the feed screw mechanism 1 of the electric motor via an opening 102 of the base end surface 93.


Inventors:
Murata, Daisuke
Ichikawa, Toshiro
Magai, Kazumi
Kogo, Tetsuya
Application Number:
JP2011000051460
Publication Date:
October 04, 2012
Filing Date:
March 09, 2011
Export Citation:
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Assignee:
NIDEC TOSOK CORP
International Classes:
F16H25/20; F16H25/24; H02K7/06
Domestic Patent References:
2007-02-01
2010-01-28
2009-06-04
Foreign References:
US20100192713A12010-08-05