Actuator seal bearing assembly and method

专利名称：Actuator seal bearing assembly and method发明人：Leopold J. Niessen申请号：US09221790申请日：19981228公开号：US06173965B1公开日：20010116

专利附图：

摘要：A seal bearing assembly and method for a pneumatic actuator is provided forplacement within a groove in an actuator piston. For maintaining a compact size of thepiston, the piston preferably has only a single encircling piston groove. In accord with thepresent invention, a compressible seal and bearing ring are positioned adjacent each

other within the single piston groove. The compressible seal ring and bearing ring aresized so that side-to-side movement is possible within the piston groove until the pistonis inserted into the pneumatic actuator cylinder. Upon insertion of the piston,

compression of the seal ring causes the diameter of the seal ring to expand within thepiston groove thereby securing the seal bearing assembly into a fixed position thatprevents side-to-side movement of the assembly. The bearing is preferably non-metallicand centralizes the piston within the actuator cylinder to prevent metal-to-metal contact,scoring, and resulting wear. The bearing ring has a lateral side adjacent to thecompressible seal ring with a concave groove therein to receive and support thegenerally convex surface of the compressible seal ring. Preferably the radius of the arc,which may be circular, elliptical, hyperbolic or the like, of the concave groove of thebearing ring is less than the radius of the cross-section of the uncompressed seal ring.Compression of the seal ring distorts the uncompressed profile of the seal ring so thatthe cross-sectional profile of the compressed seal ring mates closely with the concavegroove of the bearing ring. An opposite lateral side of the bearing ring preferably has achamferred corner adjacent the bottom of the piston groove.

申请人：NIESSEN LEOPOLD J.

代理人：Kenneth L. Nash

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