Patent US2485915A successfully refreshed from Google Patents.
US3902830A
Expired / Lapsed
US
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Side seal means for use in rotary piston internal combustion engine
Assignee: Nippon Piston Ring Co Ltd
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Filing: 1973-02-21
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Granted: 1975-09-02
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Expires: 1993-02-21
Abstract
Abstract A side seal means for use in a rotary piston internal combustion engine comprises an inner side seal mounted in an inner side seal groove provided on the side face of the rotor of the engine along the side edge thereof and an outer side seal mounted in an outer side seal groove provided on said side face outside said inner side seal groove and parallel thereto. The inner side seal made of steel is provided with a hardened layer at least on the sliding surface thereof, and the outer side seal made of steel is provided with chrome plate at least on the sliding surface thereof.
Inventors
- 👤 Toshiyuki Maeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:52
CPC Classifications
F; F01; F01C; F01C19/00; F01C19/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
144 words
In a side seal arrangement for use in a rotary piston internal combustion engine including two radially spaced inner side seal grooves provided on the side face of the rotor of the engine along the side edge thereof with an inner side seal mounted in the radially inner side seal groove and an outer side seal mounted in the radially outer side seal groove with the side seals being generally parallel, the improvement comprising said outer side seal being made of steel and being chrome plated at least on the sliding surface thereof, and said inner side seal being made of steel and being provided with a hardened layer at least on the sliding surface thereof with said layer on said sliding surface being hardened to a degree such that said inner and outer side seals have substantially equal wear rates during engine operation.
Claim 2
Dependent Claim
144 words
In a side seal arrangement for use in a rotary piston internal combustion engine including two radially spaced inner side seal grooves provided on the side face of the rotor of the engine along the side edge thereof with an inner side seal mounted in the radially inner side seal groove and an outer side seal mounted in the radially outer side seal groove with the side seals being generally parallel, the improvement comprising said outer side seal being made of steel and being chrome plated at least on the sliding surface thereof, and said inner side seal being made of steel and being provided with a hardened layer at least on the sliding surface thereof with said layer on said sliding surface being hardened to a degree such that said inner and outer side seals have substantially equal wear rates during engine operation.
Claim 3
Dependent Claim
67 words
A side arrangement means for use in a rotary internal combustion engine as defined in claim 1 wherein said outer side seal is provided with two layers on the peripheral surface thereof, one of the layers comprising a hardened layer provided at least on the surface excluding said sliding surface thereof and the other layer comprising said chrome plate provided at least on said sliding surface thereof.
Claim 4
Dependent Claim
33 words
A side seal means for use in a rotary internal combustion engine as defined in claim 1 wherein said inner side seal is covered with the hardened layer over the whole surface thereof.
References Cited (Backward Citations)
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US3059584A
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US3528757A
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US3575537A
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US3658451A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |