Oil damped piston
AssigneeCaterpillar Tractor Co.
InventorsHarold C. Powers, Robert B. Cambron
Life of this patent
Estimating the term…
Abstract
An improved oil damped piston for use in internal combustion engines, pumps, compressors, or the like. The piston includes a generally cylindrical piston body having a crown and a depending skirt. A pair of spaced bands of polytetrafluoroethylene are carried by the skirt and each has a surface radially outwardly of the skirt. Each of the band surfaces includes a configuration defining a pumping surface for directing lubricant on a cylinder wall into the space between the band. The oil in the space damps side to side movement of the piston within its cylinder.
Claims1
A piston assembly for lunbricated internal combustion engines, pumps, compressors, or the like, comprising:
- a. a generally cylindrical piston body having a crown and a depending skirt;
- b. a pair of annular grooves on said skirt, said grooves being spaced from each other to define an annular receiving space;
- c. a ring of heat resistant, low friction, polymerized, inert bearing material in each of said grooves and having a portion extending outwardly therefrom, each ring having a chamfered surface on said portion and remote from said space;
- d. a cross bore in said body for receiving a wrist pin;
- and
- e. an additional annular groove in said piston body and located between said pair of grooves and said crown, an oil ring disposed in said additional groove, and a conduit in said body interconnecting said additional groove and said annular lubricant receiving space between said pair of grooves.
Dependencies are inferred from the claim text.