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. 16, 2002
Filed:
Jan. 13, 2000
Applicant:
Inventor:
Osamu Aiba, Kusatsu, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04B 1/700 ; F04B 3/500 ;
U.S. Cl.
CPC ...
F04B 1/700 ; F04B 3/500 ;
Abstract
A crankshaft directly connected to an electric motor and operably connected to a drive load is supported at two locations with bearings that are respectively subject to different amount of bearing loads. A resilient member is interposed between the inner race of one or both of the bearings and the crankshaft for applying an axial pre-load to the bearings. The weight of the crankshaft and the rotor, and/or a magnetic attractive force generated in the electric motor is/are applied to the bearing as an axial pre-load in addition to the pre-load by the resilient member.