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:
Jan. 04, 2005
Filed:
Dec. 30, 2002
Shigeyuki Kiyota, Yokohama, JP;
Shigeyuki Kiyota, Yokohama, JP;
Nissan Motor Co., Ltd., Kanagawa, JP;
Abstract
A motor vehicle has road wheels driven by a direct current motor that has a brush installed therein. A system for detecting abrasion of the brush comprises a clutch arranged between the road wheel and the direct current motor. The clutch is of a wet type so that in ON condition thereof, drive and driven members thereof are engaged with each other causing transmission of a torque of the motor to the road wheel and in OFF condition thereof, the drive and driven members thereof are disengaged from each other permitting a certain but small transmission of a torque of the road wheels toward the motor due to a viscosity possessed by oil in the clutch. A rotation speed sensor is provided that detects a rotation speed of the motor. A control unit is provided that issues a brush abrasion representing signal based on the rotation speed of the motor detected under OFF condition of the clutch.