Patent US3843283A successfully refreshed from Google Patents.
US3843283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inner seal for the piston of a rotary piston machine
Assignee: Wankel GmbH
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Filing: 1973-03-20
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Granted: 1974-10-22
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Expires: 1993-03-20
Abstract
Abstract This invention relates to an annular seal for the face of the piston of a rotary piston machine of the trochoidal type, of which the housing comprises two end portions and a peripheral wall portion with a multi-lobed inner surface, in which the piston is mounted to rotate on an eccentric, the seal having at least two scraper rings which are urged resiliently against the adjacent end wall of the housing to prevent the passage of coolant or lubricant into the working chambers. Such seals are known as inner seals.
Inventors
- 👤 G Wilmers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:22
CPC Classifications
F; F01; F01C; F01C19/00; F01C19/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
142 words
An inner annular seal for the piston of a rotary piston machine of the trochoidal type, of which the housing comprises two end wall portions and a peripheral wall portion with a multilobed inner surface, in which the piston is arranged to rotate on an eccentric, the inner seal comprising at least two scraper rings, means for resiliently urging the rings against the adjacent end wall of the housing, a backing ring of L-shaped cross section and having a radial limb with an inner peripheral surface and an axial limb, the scraper rings being arranged between the axial limb and the radial limb of the backing ring of L-shaped cross section, the inner scraper ring being located by the inner peripheral surface of the radial limb of the backing ring and the outer scraper ring being located on the inner scraper ring.
Claim 2
Dependent Claim
142 words
An inner annular seal for the piston of a rotary piston machine of the trochoidal type, of which the housing comprises two end wall portions and a peripheral wall portion with a multilobed inner surface, in which the piston is arranged to rotate on an eccentric, the inner seal comprising at least two scraper rings, means for resiliently urging the rings against the adjacent end wall of the housing, a backing ring of L-shaped cross section and having a radial limb with an inner peripheral surface and an axial limb, the scraper rings being arranged between the axial limb and the radial limb of the backing ring of L-shaped cross section, the inner scraper ring being located by the inner peripheral surface of the radial limb of the backing ring and the outer scraper ring being located on the inner scraper ring.
Claim 3
Dependent Claim
23 words
An inner seal according to claim 1, in which a radial gap is provided between the outer scraper ring and the backing ring.
Claim 4
Dependent Claim
21 words
An inner seal according to claim 1 in which a resiliently yielding sealing ring is arranged between the two scraper rings.
Claim 5
Dependent Claim
25 words
An inner seal according to claim 3 in which the sealing ring between the two scraper rings is formed as an O-ring of elastomeric material.
Claim 6
Dependent Claim
33 words
An inner seal according to claim 3 in which the sealing ring between the two scraper rings is formed as a metallic ring of C-shaped cross section acting resiliently in a radial direction.
Claim 7
Dependent Claim
26 words
An inner seal accordin to claim 1 in which the inner scraper ring is permanently and sealingly connected to the backing ring by an annular diaphragm.
Claim 8
Dependent Claim
40 words
An inner seal according to claim 6, in which the annular diaphragm is formed so that it serves as an engaging spring for the inner scraper ring to urge it in use against the adjacent end wall of the housing.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |