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Patent Searching and Data


Title:
DRIVE DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/039060
Kind Code:
A1
Abstract:
Provided is a drive device which comprises: a rotor having a motor shaft and a rotor core; a stator; and a housing having a containing section capable of holding oil. The motor shaft has: a shaft body extending in the direction of a center axis; a cylindrical, rotor core holding section located radially outside the shaft body; a connection section for radially connecting the outer peripheral surface of the shaft body and the inner peripheral surface of the rotor core holding section; a first oil passage extending axially within the shaft body and open to an axial end of the shaft body; a plurality of second oil passages branching off from the first oil passage and extending radially within the connection section; and a plurality of third oil passages which branch off from the second oil passages, extend axially within the connection section, and are open to the surfaces of the connection section, which face one axial side and the other axial side. The flow passage cross-sectional area of the second oil passages is smaller than that of the first oil passage, and the flow passage cross-sectional area of the third oil passages is smaller than that of the second oil passages.

Inventors:
ISHIKAWA YUKI (JP)
NAKAMATSU SHUHEI (JP)
Application Number:
PCT/JP2018/023304
Publication Date:
February 28, 2019
Filing Date:
June 19, 2018
Export Citation:
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Assignee:
NIDEC CORP (JP)
International Classes:
H02K9/19; H02K1/20; H02K1/32; F16H57/04
Foreign References:
JP2017131078A2017-07-27
JP2016086462A2016-05-19
JP2009213231A2009-09-17
JP2009291056A2009-12-10
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