US4050360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil damped piston
Assignee: Caterpillar Inc
•
Filing: 1975-09-19
•
Granted: 1977-09-27
•
Expires: 1995-09-19
Abstract
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.
Inventors
- 👤 Harold C. Powers
- 👤 Robert B. Cambron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:42
CPC Classifications
F; F04; F04B; F04B39/00; F04B39/0005; F04B39/02; F04B39/0284; F04B39/0292; F16; F16J; F16J1/00; F16J1/02; F05; F05C; F05C2225/00; F05C2225/04; Y; Y10; Y10S; Y10S277/00; Y10S277/904; Y10T; Y10T74/00; Y10T74/21; Y10T74/2142; Y10T74/2162
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
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.
Claim 2
Dependent Claim
148 words
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.
References Cited (Backward Citations)
US1700894A
Cited
US2718443A
Cited
US2742883A
Cited
US3168013A
Cited
US3268235A
Cited
US3521531A
Cited
US3418001A
Cited
US3733973A
Cited
US3835714A
Cited
US3942806A
Cited
US3906923A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |