Hydraulic motor balancing ring seal
AssigneeGarlock Inc.
InventorsDouglas A. Cather, Jr., Martin E. Benjamin
Life of this patent
Estimating the term…
Abstract
Inner and outer sealing rings (16 and 18) for the balancing ring (12) of a hydraulic motor, each comprising an annular elastomeric body (30) including a flat, radially extending central ring (36) and a pair of sealing elements (38 and 40) projecting axially away from opposite ends of the central ring (36) and in opposite axial directions therefrom and tapering to a sealing lip (50 and 52) in the directions away from the central ring. The inner and outer sealing rings (16 and 18) have cylindrical O.D. and I.D. surfaces, (54 and 66), respectively. Each sealing ring preferably has a reinforcing ring (32 and 62) and a liner (34 and 64) of low friction material.
Claims48
An annular elastomeric sealing ring comprising a unitary elastomeric body including a flat, radially extending central ring, a pair of sealing elements projecting axially away from opposite ends of said central ring and in opposite axial directions therefrom, said sealing elements each tapering to a sealing lip in the direction axially away from said central ring, and at least one of said sealing elements and the adjacent radial end of said central ring having a coextensive cylindrical surface forming one of the I.D. or the O.D. surfaces of of said sealing ring.
An annular, elastomeric sealing ring for a valve seating balancing ring for a hydraulic motor comprising:
- (a) a unitary molded elastomeric body;
- (b) said body including a flat central ring having first and second radial surfaces and first and second axial end surfaces, said first radial surface being the axially inner radial surface and said second radial surface being the axially outer radial surface of said central ring, and said first axial surface being the radially inner end surface and said second axial surface being the radially outer end surface of said ring;
- (c) said body also including an annular first sealing element extending axially inwardly from one radial end portion of said central ring and tapering to a sealing lip;
- and
- (d) said body also including an annular second sealing element extending axially outwardly from the other radial end portion of said central ring and tapering to a sealing lip.
An apparatus comprising:
- (a) an annular valve seating balancing ring for a hydraulic motor, said balancing ring being "T-shaped" in cross-section and including a radially extending ring and an axially extending annular tongue;
- (b) an end cap for a hydraulic motor positioned adjacent said balancing ring and having an annular axially extending groove therein;
- said balancing ring tongue extending into said groove;
- (c) a pair of valve seating balancing ring sealing rings located in the annular space between and in sealing contact with each of said balancing ring and said end cap, said sealing rings including an inner sealing ring in sealing contact with the I.D. of said tongue and an outer sealing ring in sealing contact with the O.D. of said tongue;
- and
- (d) each of said sealing rings comprising a single unitary elastomeric body including a flat central ring, a pair of sealing elements projecting axially away from opposite ends of said central ring and in opposite axial directions therefrom, said sealing elements each tapering to a sealing lip in the direction axially away from said central ring, one of said sealing elements and the adjacent radial end of said central ring having a coextensive cylindrical surface in contact with said tongue.
Dependencies are inferred from the claim text.