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. 10, 1984
Filed:
Nov. 27, 1981
Applicant:
Inventor:
Deryk S Gould, Edinburgh, GB;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F04B / ; H02K / ;
U.S. Cl.
CPC ...
417414 ; 310 87 ;
Abstract
In a fluid-filled electric motor having a throughgoing shaft the requirements (i) internal fluid pressure maintained above ambient during installation (ii) equalization of internal and ambient pressures at run-up (iii) no solid particles contaminate internal fluid are met by a pressurizing apparatus in which internal motor pressure above ambient moves a piston against a spring. The pressure ensures integrity of a seal and pressure and temperature variations are accommodated by piston movement. The seal runs clear of the motor shaft allowing equalization of internal and ambient pressures during run up to speed. Only liquid can enter the spring chamber.