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Title:
ELECTRIC DRIVE DEVICE AND ELECTRIC POWER STEERING DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/166649
Kind Code:
A1
Abstract:
Air circulation passages 38A, 38B are provided to connect a storage space Sp of an electronic control unit to the outside and to circulate air in order to buffer internal pressure fluctuations, a divided air circulation passage 41 is formed in which the storage space sides of the air circulation passages 38A, 38B are divided into a plurality of passages, a cooling target member 16 is arranged so as to be in thermal contact with the air flowing through the divided air circulation passage 41, and the total cross-sectional area of the divided air circulation passage 41 is made smaller than the cross-sectional areas of the air circulation passages 38A, 38B that have not been divided. Since the storage space of the electronic control unit is connected to the outside by the air circulation passages, internal pressure fluctuations can be buffered, and the flow velocity of the air flowing through the divided air circulation passage on the storage space side of the air circulation passages can be increased to dissipate efficiently the heat from inside the storage space.　These features make it possible to suppress internal pressure fluctuations in the storage space of the electronic control unit and efficiently dissipate heat generated in the electronic control unit to the outside.

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Inventors:
HARA HIDEYUKI (JP)
Application Number:
PCT/JP2020/005468
Publication Date:
August 20, 2020
Filing Date:
February 13, 2020
Export Citation:
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Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
H02K5/20; B62D5/04; H02K9/02; H02K9/26; H02K11/33; H05K7/20
Domestic Patent References:
WO2009060810A12009-05-14
Foreign References:
JP2018148718A2018-09-20
JP2017195687A2017-10-26
JP2018046745A2018-03-22
JP2018038218A2018-03-08
Attorney, Agent or Firm:
KOBAYASHI, Hiromichi et al. (JP)
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