Title:
ROLLER SCREW UNIT
Document Type and Number:
WIPO Patent Application WO/2021/020263
Kind Code:
A9
Abstract:
Provided is a roller screw unit that has a large rated load in an axial direction, generates little heat, and is capable of suppressing fluctuations of friction torque caused due to a free zone obtained when a rolling direction is reversed. A spiral thread (10) is provided on an outer surface of a screw shaft (2). Spiral nut threads (6a, 6b) are provided on an inner surface of a nut (3). An outer diameter (D1) of the thread (10) of the screw shaft (2) is set to be greater than an inner diameter (D2) of the nut threads (6a, 6b) of the nut (3). Screw shaft raceway surfaces (11, 12) are formed on respective side surfaces of the thread (10) of the screw shaft (2). Nut raceway surfaces (21, 22) opposing the screw shaft raceway surfaces (11, 12) are formed on respective side surfaces of the nut threads (6a, 6b) of the nut (3). A plurality of rollers (5a, 5b) are interposed in a rollable manner between the screw shaft raceway surfaces (11, 12) and the nut raceway surfaces (21, 22).
Inventors:
SHAMOTO EIJI (JP)
NAKAMURA TAKASHI (JP)
TAKAHASHI TORU (JP)
HAMADA YOSHIHIRO (JP)
KISHI HIROYUKI (JP)
NAKAMURA TAKASHI (JP)
TAKAHASHI TORU (JP)
HAMADA YOSHIHIRO (JP)
KISHI HIROYUKI (JP)
Application Number:
PCT/JP2020/028380
Publication Date:
March 25, 2021
Filing Date:
July 22, 2020
Export Citation:
Assignee:
TOKAI NATIONAL HIGHER EDUCATION AND RES SYSTEM (JP)
THK CO LTD (JP)
THK CO LTD (JP)
International Classes:
F16H25/22; F16H25/24
Attorney, Agent or Firm:
SHIOJIMA, Toshiyuki (JP)
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