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. 12, 1988
Filed:
Aug. 14, 1986
Kazuhiko Kawajiri, Amagasaki, JP;
Michio Fujiwara, Amagasaki, JP;
Kazunori Tsuchino, Amagasaki, JP;
Yoshio Kazumoto, Amagasaki, JP;
Tamotsu Nomaguchi, Amagasaki, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A seal mechanism for a Stirling engine has an upper and lower piston ring mounted on a displacer piston with a space therebetween and at least one piston ring mounted on a power piston. The seals produced by the piston rings of the displacer piston are given directionality in opposite directions so that the pressure within the space between the upper and lower piston rings is always higher or lower than the pressure within the expansion space and the compression space of the engine. In a preferred embodiment, the displacer piston rings each comprise two loosely-fitting outer rings which surround an inner ring. Air vents are formed in one surface of each of the inner rings between the center and the outer surface of the inner ring. The inner rings of the upper and lower piston rings are oriented so that the air vents face in opposite directions. Means for imparting directionality in the same direction to the seals produced by the power piston rings may also be provided.