Injection moldable piston rings
AssigneeBendix Commercial Vehicle Systems LLC
InventorValery Dunaevsky
Life of this patent
Estimating the term…
Abstract
An oil-less/oil-free air brake compressor comprising a bore, a piston positioned for reciprocating in the bore, the piston having an annular recess and a rigid polymeric piston ring received within the annular recess, the piston ring having a predetermined non-circular profile in the free state.
Claims23
An oil-less/oil-free air brake compressor, comprising:
- a bore;
- a piston positioned for reciprocating in the bore, the piston having an annular recess;
- and
- a rigid polymeric piston ring received within the annular recess, the piston ring having a predetermined non-circular profile in the free state.
An oil-less/oil-free air brake compressor, comprising:
- a bore;
- a piston positioned for reciprocating in the bore, the piston having an annular recess;
- a rigid polymeric seal ring received within the annular recess;
- and
- a means for biasing the ring against the bore.
A sealing device for an air compressor, comprising:
- a discontinuous polymeric ring residing in a cooperating piston ring groove of an oil-free/oil-less air compressor piston, wherein the face of the ring engages a surface of a bore, the ring having a predetermined, noncircular shape in the free state.
A piston assembly for use within a bore of a reciprocating oil-less/oil-free air compressor, comprising:
- a piston including a piston ring receiving annular groove;
- and
- a polymeric piston ring disposed within the annular groove of the piston;
- the piston ring having a predetermined, noncircular shape in the free state.
A process for manufacturing a piston ring for an oil-less/oil-free air compressor, the process comprising the steps of:
- calculating a non-circular, free-state shape for the piston ring;
- configuring a die assembly with an internal cavity with the calculated non-circular shape of the ring;
- injecting a polymer into the die assembly;
- allowing the polymer to cure;
- removing the polymer from the mold;
- and
- inspecting the ring for conformability in a round gage.
Dependencies are inferred from the claim text.