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. 06, 1998
Filed:
May. 23, 1996
Akiyoshi Higashiyama, Isesaki, JP;
Sanden Corporation, , JP;
Abstract
A fluid displacement apparatus includes a housing having a fluid inlet and fluid outlet, and a pair of grooves disposed on an inner surface thereof. A fixed scroll is fixedly disposed within the housing and has a circular end plate from which a first spiral element extends into the interior of the housing. An orbiting scroll has a circular end plate from which a second spiral element extends and has a pair of grooves formed on the circular end plate. An Oldham coupling disposed between the orbiting scroll and the housing includes a ring, a pair of first engaging portions formed on the ring for engaging with the grooves on the end plate of the orbiting scroll and a pair of second engaging portions formed on the ring for engaging with the grooves disposed on the inner surface of the housing. The ring further comprises at least one ring portion subject to a compressive stress and at least one ring portion subject to a tensile stress. A cross sectional area of the at least one ring portion subject to compressive stress is smaller than a cross sectional area of the at least one ring portion subject to tensile stress. Accordingly, the fluid displacement apparatus has a light weight Oldham coupling which reduces noise and vibration during high speed operation.