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:
May. 17, 1988
Filed:
Apr. 21, 1986
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
310 87 ;
Abstract
In a submersible motor, a liquid is filled into its rotor chamber, a shaft to which a rotor is fixed is supported on a frame by sleeve bearings, and a diaphragm for controlling the pressure within the rotor chamber is disposed at the lower portion of the frame. Chambers communicating with the rotor chamber, are disposed above an upper sleeve bearing and the chambers accomodate a reserve liquid having a volume larger than that of the diaphragm. Therefor, even if the pressure within the rotor chamber rises and the diaphragm is deformed, the upper sleeve bearing is continuously filled with the liquid, thereby enabling continuous lubrication and cooling.