Title:
ELECTRIC LINEAR ACTUATOR
Document Type and Number:
WIPO Patent Application WO/2014/058050
Kind Code:
A1
Abstract:
Provided is an electric linear actuator configured so that sliding friction and wear are reduced and so that the electric linear actuator is provided with a rotation prevention mechanism for a screw shaft, the rotation prevention mechanism having a simple configuration and being low in cost. An electric linear actuator is provided with a ball-screw mechanism (8) which converts the rotational motion of an electric motor (3) into the axial rectilinear motion of a drive shaft (7) through a speed reduction mechanism (6). A ridge (21) is formed on the inner periphery of a closed-end hole (9) in a housing (2a). A sleeve (18) is fitted in the closed-end hole (9). The sleeve (18) is formed by press-work from a cold-rolled steel plate having a liquid-phase coating applied thereto. Axially extending grooves (18a) are formed in the sleeve (18) at equal intervals in the circumferential direction so that the sleeve (18) has a petaloid cross-sectional shape. A through-hole (19) extending in the radial direction is formed at an end of a screw shaft (12), and a guide pin (20) is inserted and fitted in the through-hole (19) and engaged with grooves (18a) of the sleeve (18).
More Like This:
Inventors:
OHNISHI TAKAAKI (JP)
HATANO KUNIMICHI (JP)
KAZUNO KEISUKE (JP)
YOSHIDA HIRAKAZU (JP)
HATANO KUNIMICHI (JP)
KAZUNO KEISUKE (JP)
YOSHIDA HIRAKAZU (JP)
Application Number:
PCT/JP2013/077741
Publication Date:
April 17, 2014
Filing Date:
October 11, 2013
Export Citation:
Assignee:
NTN TOYO BEARING CO LTD (JP)
OHNISHI TAKAAKI (JP)
HATANO KUNIMICHI (JP)
KAZUNO KEISUKE (JP)
YOSHIDA HIRAKAZU (JP)
OHNISHI TAKAAKI (JP)
HATANO KUNIMICHI (JP)
KAZUNO KEISUKE (JP)
YOSHIDA HIRAKAZU (JP)
International Classes:
F16H25/24; B21D53/10; F16H25/20; H02K7/06
Foreign References:
| JPS639547U | 1988-01-22 | |||
| JP2010270887A | 2010-12-02 | |||
| JP2012082921A | 2012-04-26 | |||
| JP2002206559A | 2002-07-26 | |||
| JPH09144831A | 1997-06-03 | |||
| JP2005299726A | 2005-10-27 | |||
| JP2007333046A | 2007-12-27 |
Other References:
See also references of EP 2908028A4
Attorney, Agent or Firm:
KOSHIKAWA, TAKAO (JP)
Takao Koshikawa (JP)
Takao Koshikawa (JP)
Download PDF: