Title:
ELECTRIC ACTUATOR
Document Type and Number:
WIPO Patent Application WO/2011/162369
Kind Code:
A1
Abstract:
[Problem] To provide an electric actuator that has fewer parts, lower costs and improved reliability due to the simplification of the rotation prevention mechanism. [Solution] A ball screw mechanism (8) is formed from a nut (16) that is connected to a speed reduction mechanism (6) and supported by a rolling bearing (18), which is mounted to a housing (2), in a manner such that the nut (16) is capable of rotating but is incapable of moving in the axial direction, and a screw shaft (15) that is inserted into the nut (16) with a plurality of balls therebetween and is coaxially integrated with a drive shaft (7). A cylindrical sac hole that houses the drive shaft (7) is formed in the housing (2a). A sensor cover (13) is detachably fixed to this sac hole; a guide member (14) having a recessed groove (14a) that has a substantially U-shaped cross section and extending along the axial direction towards the drive shaft (7) is mounted to the inner wall of this side cover (13); and the screw shaft (15) is supported in a manner so as to be capable of moving in the axial direction but incapable of rotation relative to the housing (2a) when a rotation prevention pin (9) embedded in the external diameter of the screw shaft (15) engages with the guide member (14).
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Inventors:
SHIMIZU TATSUNORI (JP)
Application Number:
PCT/JP2011/064518
Publication Date:
December 29, 2011
Filing Date:
June 24, 2011
Export Citation:
Assignee:
NTN TOYO BEARING CO LTD (JP)
SHIMIZU TATSUNORI (JP)
SHIMIZU TATSUNORI (JP)
International Classes:
F16H25/20; F16H25/22; H02K7/06; H02K11/00
Foreign References:
| JP2010031965A | 2010-02-12 | |||
| JPH0849782A | 1996-02-20 | |||
| JP2005325956A | 2005-11-24 | |||
| JP2005163922A | 2005-06-23 | |||
| JPH02186157A | 1990-07-20 | |||
| JPS62198853U | 1987-12-17 | |||
| JPH0233171U | 1990-03-01 |
Attorney, Agent or Firm:
KOSHIKAWA, TAKAO (JP)
Takao Koshikawa (JP)
Takao Koshikawa (JP)
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Claims:
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