LINEAR ACTUATOR AND FORKLIFT - HITACHI CONSTRUCTION MACHINERY

Title:

LINEAR ACTUATOR AND FORKLIFT

Document Type and Number:

WIPO Patent Application WO/2010/150732

Kind Code:

A1

Abstract:

A linear actuator comprising: a screw shaft (1); a screw thread (30) helically formed on the outer periphery of the screw shaft; main rollers (4) each having a rolling surface (4c) for making contact with a flank surface (1a) of the screw thread and rolling on the flank surface through the rolling surface by rotating about the rotation axis (D) of the main roller; roller support members (6) for supporting the main rollers so that the main rollers can rotate about the rotation axes of thereof; and a roller cage (2) for supporting the roller support members so that the roller support members can rock against the force transmitted from the flank surface to the main rollers through the rolling surfaces, the roller cage (2) being adapted to rotate about the screw shaft relative thereto when the main rollers rolls. Even if there is play between parts due to dimensional errors thereof, the rollers and the screw shaft can be reliably caused to be in linear contact with each other.

Inventors:

HAYASE ISAO (JP)
HIRAKU KENJI (JP)
YAMADA HIROYUKI (JP)
OCHIAI MASAMI (JP)
YANAGI YUICHI (JP)

Application Number:

PCT/JP2010/060447

Publication Date:

December 29, 2010

Filing Date:

June 21, 2010

Export Citation:

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Assignee:

HITACHI CONSTRUCTION MACHINERY (JP)
HAYASE ISAO (JP)
HIRAKU KENJI (JP)
YAMADA HIROYUKI (JP)
OCHIAI MASAMI (JP)
YANAGI YUICHI (JP)

International Classes:

F16H25/24; B66F9/075; F16H25/22

Domestic Patent References:

WO2007066965A1

2007-06-14

Foreign References:

JPH11514076A	1999-11-30
JPH05288253A	1993-11-02
JP2001323983A	2001-11-22
JP2001106493A	2001-04-17
JPS61286663A	1986-12-17
JP2594535Y2	1999-04-26
JPH0617717B2	1994-03-09
JPS6291050U	1987-06-10

Other References: