The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 18, 2017
Filed:
Mar. 01, 2012
Hiroyuki Tokunaga, Hiratsuka, JP;
Akira Okabe, Naka-gun, JP;
Kazuhiro Okamoto, Hitachinaka, JP;
Teiichirou Chiba, Hiratsuka, JP;
Natsuki Watanabe, Hiratsuka, JP;
Hiroyuki Tokunaga, Hiratsuka, JP;
Akira Okabe, Naka-gun, JP;
Kazuhiro Okamoto, Hitachinaka, JP;
Teiichirou Chiba, Hiratsuka, JP;
Natsuki Watanabe, Hiratsuka, JP;
Komatsu Ltd., Tokyo, JP;
Abstract
A motor cooling structure for cooling a motor, which includes a shaft transmitting power and a rotor core attached to an outside of the shaft, by a cooling medium, includes: a cooling medium supply passage that extends to an inside of the shaft in an axial direction of the shaft and passes the cooling medium through the cooling medium supply passage; and a plurality of cooling medium passages that are branched from the cooling medium supply passage to cool the rotor core while flowing the cooling medium without branching the cooling medium in the axial direction and then eject the cooling medium from a plurality of ejection holes opened to a surface of the rotor core, wherein distances from a cooling medium inlet, through which the cooling medium flows into the cooling medium supply passage, to the respective ejection holes are equal between the plurality of cooling medium passages.