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. 04, 1982
Filed:
Dec. 08, 1980
Harold L Reinsma, Dunlap, IL (US);
Ernest B Clark, III, Peoria, IL (US);
Caterpillar Tractor Co., Peoria, IL (US);
Abstract
A seal apparatus (40) for sealing between relatively rotatable structures (12,14) is provided and has a pair of seal rings (62,64) which are engageable at axial sealing face portions (70,72). Axially facing surfaces (78,80) of the first seal ring (62) are arranged such that fluid pressure acting thereon biases it in a first direction. Axial positioning and circumferential retention of the second seal ring (64) is provided by an elastomeric toric (68) which is arranged radially between the second seal ring (64) and a retaining ring structure (46) which constitutes a part of the relatively rotatable structure (14). Axially facing surfaces (82,84,96) of the second seal ring (64) and the sealing toric (68) have areas in the axial direction which cause the second seal ring (64) to be pressure balanced in the axial direction by fluid pressure exerted thereon. A Belleville spring (88) is arranged axially between the retaining ring structure (46) and the second seal ring (64) and is prestressed to provide a constant axial force against the second seal ring (64). The toric (68) is engaged only on its radial extremes and thus may readily roll about its circular, central axis, but, when suitably radially compressed, will not readily slide circumferentially or axially relative to the second seal ring (64) and retaining ring structure (46).