US3797976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil seal device for rotary piston internal combustion engine
Assignee: Nippon Piston Ring Co Ltd
•
Filing: 1972-10-16
•
Granted: 1974-03-19
•
Expires: 1992-10-16
Abstract
Abstract An oil seal device of a rotary piston internal combustion engine whose rotor is formed with one or more oil seal grooves, has a spring disposed within the bottom of the oil seal groove of the rotor and has an intermediate ring provided with a seal element formed of rubber or synthetic resin at least on the inner and outer periphery thereof, disposed between the rear surface of an oil seal body and the spring.
Inventors
- 👤 N Kurio
- 👤 S Moriya
- 👤 S Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:47
CPC Classifications
F; F01; F01C; F01C19/00; F01C19/10; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/38
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
96 words
In an oil seal device for a rotary piston internal combustion engine having a rotor formed with one or more annular oil seal grooves within the rotor sidewall, an oil seal body within said groove, and a spring disposed within the bottom of the oil seal groove of said rotor facing said oil seal body, the improvement comprising: an intermediate ring provided with seal means on at least the radially inner and outer periphery thereof relative to the rotor axis disposed within said groove, between the rear surface of the oil seal body and said spring.
Claim 2
Dependent Claim
96 words
In an oil seal device for a rotary piston internal combustion engine having a rotor formed with one or more annular oil seal grooves within the rotor sidewall, an oil seal body within said groove, and a spring disposed within the bottom of the oil seal groove of said rotor facing said oil seal body, the improvement comprising: an intermediate ring provided with seal means on at least the radially inner and outer periphery thereof relative to the rotor axis disposed within said groove, between the rear surface of the oil seal body and said spring.
Claim 3
Dependent Claim
21 words
The oil seal device as set forth in claim 1, wherein said seal means is formed of rubber or synthetic resin.
Claim 4
Dependent Claim
30 words
The oil seal device as set forth in claim 1, further comprising a reinforcement ring made of metal formed on the intermediate ring for preventing said intermediate ring from wearing.
Claim 5
Dependent Claim
41 words
The oil seal device as set forth in claim 1, wherein said seal means includes separate inner and outer peripheral seal portions, with said portions engaging said reinforcement ring by means of an interlocking recess and raised portion on respective members.
Claim 6
Dependent Claim
28 words
The oil seal device as set forth in claim 1, wherein said seal means comprises inner and outer peripheral seal portions in the form of wavy resilient members.
Claim 7
Dependent Claim
40 words
The oil seal device as set forth in claim 1, wherein said seal means comprises inner and outer peripheral portions of said intermediate ring which are directed oppositely to each other relative to the top and bottom of said groove.
Claim 8
Dependent Claim
23 words
The oil seal device as set forth in claim 1, wherein rubber or synthetic resin covers the complete surface of said reinforcement ring.
Claim 9
Dependent Claim
29 words
The oil seal device as set forth in claim 1, wherein said oil seal body is U-shape in section defined by a groove inon the inner peripheral surface thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |