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).
More Like This:
| WO/2007/066965 | BEARING SCREW FEED DEVICE |
| WO/2003/048610 | SCREW ACTUATOR MODULE |
| JP2005325944 | LEAD SCREW TYPE MOVING DEVICE AND ITS MOVING BODY |
Inventors:
SHIMIZU, Tatsunori (1578 Higashikaizuka, Iwata-sh, Shizuoka 10, 〒4388510, JP)
Application Number:
JP2011/064518
Publication Date:
December 29, 2011
Filing Date:
June 24, 2011
Export Citation:
Assignee:
NTN CORPORATION (3-17, Kyomachibori 1-chome Nishi-ku, Osaka-sh, Osaka 03, 〒5500003, JP)
ＮＴＮ株式会社 (〒03 大阪府大阪市西区京町堀１丁目３番１７号 Osaka, 〒5500003, JP)
ＮＴＮ株式会社 (〒03 大阪府大阪市西区京町堀１丁目３番１７号 Osaka, 〒5500003, JP)
International Classes:
F16H25/20; F16H25/22; H02K7/06; H02K11/00
Attorney, Agent or Firm:
KOSHIKAWA, Takao (19F, Hamamatsu Act Tower 111-2, Itayamachi, Naka-ku, Hamamatsu-sh, Shizuoka 91, 〒4308691, JP)
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Claims:
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