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:
Oct. 06, 1992
Filed:
Aug. 09, 1991
Edward D Pettitt, Burt, NY (US);
Robert L Swadner, East Amherst, NY (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A fluid pumping assembly including a control valve mounted in a control valve boss having an inlet exposed to the elevated discharge pressure of the discharge chamber and an outlet exposed to the reduced pressure of the crank case. The control valve is responsive to pressure differentials between the crank case and the discharge chamber and provides a fluid path between the crank case and the discharge chamber to allow lubricating fluid from the discharge chamber to be injected into the crank case through the fluid path provided by the control valve under the influence of the pressure differential existing between the crank case and the discharge chamber. The control valve boss partially bifurcates the discharge chamber to form first and second reservoirs such that oil is disposed on either side of the control valve boss in the first and second reservoirs. The assembly further includes an oil pick-up tube providing fluid communication between the control valve inlet and the first oil reservoir on one side of the control valve boss for delivering oil from the first reservoir to the control valve inlet independent of the orientation of the fluid pumping assembly. This is achieved from the use of a fluid by-pass or passageway extending through the boss and providing fluid communication between the first and second reservoirs to allow lubricating fluid to freely flow through the fluid passageway from either side of the control valve boss and between the first and second reservoirs.