Title:
MOVABLE MEMBER OPERATING ACTUATOR DEVICE
Document Type and Number:
WIPO Patent Application WO/2003/042581
Kind Code:
A1
Abstract:
An actuator device comprising a screw shaft (16), a nut member (17), and balls (18), wherein normally under a load in a first axial direction (F1), the nut member (17) moves in the first axial direction (F1) and in a second axial direction (F2) opposite thereto, with respect to the screw shaft (16). A ball thread groove (19) in the screw shaft (16) is formed with a load surface (19a) located on the side of the first axial direction (F1) with a groove bottom (19c) defining a boundary, for pressure contact with the balls (18). A ball thread groove (20) in the nut member (17) is formed with a load surface (20a) located on the side of the second axial direction (F2) with its groove bottom (20c) defining a boundary, for pressure contact with the balls (18). These load surfaces (19a, 20a) have a finishing treatment applied thereto to make the surface roughness thereof lower than that of non−load surfaces (19b, 20b).
Inventors:
OTAKI RYOICHI (JP)
HASHITANI HIDEKI (JP)
HASHITANI HIDEKI (JP)
Application Number:
PCT/JP2002/011674
Publication Date:
May 22, 2003
Filing Date:
November 08, 2002
Export Citation:
Assignee:
NSK LTD (JP)
OTAKI RYOICHI (JP)
HASHITANI HIDEKI (JP)
OTAKI RYOICHI (JP)
HASHITANI HIDEKI (JP)
International Classes:
F16H25/22; F16H25/24; F16H55/56; F16H9/18; F16H63/06; (IPC1-7): F16H25/22; F16H25/24; F16H9/18
Foreign References:
| JPS60173753U | 1985-11-18 | |||
| JPH06249309A | 1994-09-06 |
Attorney, Agent or Firm:
Suzuye, Takehiko c/o SUZUYE & SUZUYE (7-2 Kasumigaseki 3-chom, Chiyoda-ku Tokyo, JP)
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