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. 17, 2012
Filed:
Dec. 04, 2009
Yoshifumi Nabeshima, Tsuchiura, JP;
Takayoshi Murahashi, Tsuchiura, JP;
Toshikazu Minoshima, Kasumigaura, JP;
Yutaka Watanabe, Tsuchiura, JP;
Yoshifumi Nabeshima, Tsuchiura, JP;
Takayoshi Murahashi, Tsuchiura, JP;
Toshikazu Minoshima, Kasumigaura, JP;
Yutaka Watanabe, Tsuchiura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
In case a temperature (T) of a lubricant oil (G) cannot be detected by an oil temperature sensor () provided on an output side of a lubricant pump (), the temperature (Tm) of a wheel drive motor () is detected by using a motor temperature sensor () provided on the wheel drive motor (). By estimating the temperature (T) of the lubricant oil (G) from the temperature (Tm) of the wheel drive motor (), monitoring is carried out as to whether or not the temperature (Tm) has risen to a predetermined temperature (Tms) at which the cooling of the lubricant oil (G) by forced circulation is deemed necessary. The drive of a lubricant pump () by a pump drive motor () is stopped until the motor temperature (Tm) rises to a level exceeding the predetermined temperature (Tms).