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US3796436A
Expired / Lapsed
US
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Oil seal device for rotary piston internal combustion engine
Assignee: Mazda Motor Corp
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Filing: 1972-10-06
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Granted: 1974-03-12
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Expires: 1992-10-06
Abstract
Abstract In a rotary piston internal combustion engine comprising a center housing having a trochoidal inner peripheral surface, side housings provided at both sides of said center housing, a three apexed rotary piston is provided through an eccentric shaft within a casing formed by said center and side housings. An oil seal device is disposed in an annular groove formed on a thrust surface of the rotary piston including an oil seal ring having an annular recess or an annular step on the rear portion thereof. A U-shaped elastic seal ring is disposed in said annular recess or step and has two lips slidably and sealingly contacting at least one radially facing surface of said annular recess, said annular step or said annular groove, and a spring is disposed between said oil seal ring and said U-shaped elastic seal ring for pressing said oil seal ring and said U-shaped elastic sealing in opposite axial directions.
Inventors
- 👤 N Kurio
- 👤 H Minegishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:00
CPC Classifications
F; F01; F01C; F01C19/00; F01C19/08
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
174 words
In an oil seal device for rotary piston internal combustion engine comprising a center housing having a trochoidal inner peripheral surface, side housing providEd at both sides of said center housing, a multi-apexed rotary piston mounted for movement within the casing formed by said center and side housing, said oil seal device including an oil ring disposed in an annular groove formed on a thrust surface of said rotary piston facing a side housing, the improvement comprising: a. said oil seal ring having an annular recess within the rear face thereof facing the bottom of said annular groove, b. a U-shaped elastic seal ring with lips at opposed ends disposed in said annular recess, c. the lips of said U-shaped elastic sealing ring sealingly contacting opposed radially facing surfaces defined at least partially by said recess, d. a spring disposed within said U-shaped elastic seal ring and contacting the bottom face of said recess and said seal ring to press said oil seal ring and said U-shaped elastic seal ring in opposite axial directions.
Claim 2
Dependent Claim
174 words
In an oil seal device for rotary piston internal combustion engine comprising a center housing having a trochoidal inner peripheral surface, side housing providEd at both sides of said center housing, a multi-apexed rotary piston mounted for movement within the casing formed by said center and side housing, said oil seal device including an oil ring disposed in an annular groove formed on a thrust surface of said rotary piston facing a side housing, the improvement comprising: a. said oil seal ring having an annular recess within the rear face thereof facing the bottom of said annular groove, b. a U-shaped elastic seal ring with lips at opposed ends disposed in said annular recess, c. the lips of said U-shaped elastic sealing ring sealingly contacting opposed radially facing surfaces defined at least partially by said recess, d. a spring disposed within said U-shaped elastic seal ring and contacting the bottom face of said recess and said seal ring to press said oil seal ring and said U-shaped elastic seal ring in opposite axial directions.
Claim 3
Dependent Claim
50 words
The oil seal device as claimed in claim 1, wherein said recess comprises an annular step provided on a radially outside rear portion of said oil seal ring and said radially facing surfaces comprise a radially facing surface of said recess and a radially facing surface of said annular groove.
Claim 4
Dependent Claim
50 words
The oil seal device as claimed in claim 1, wherein said recess comprises an annular step provided on a radially inside rear portion of said oil seal ring and said radially facing surfaces comprise a radially facing surface of said recess and a radially facing surface of said annular groove.
Claim 5
Dependent Claim
45 words
The oil seal device as claimed in claim 1, wherein said annular recess lies intermediate of the radially inside and radially outside surfaces of said oil seal ring, and wherein said radially facing surfaces comprise surfaces of the oil seal ring formed by said recess.
Claim 6
Dependent Claim
21 words
The oil seal device as claimed in claim 1, wherein said U-shaped elastic seal ring is made of a metallic material.
Claim 7
Dependent Claim
26 words
The oil seal device as claimed in claim 1, wherein said U-shaped elastic seal ring is made of a material of synthetic resin or synthetic rubber.
Claim 8
Dependent Claim
36 words
The oil seal device as claimed in claim 1, wherein the distance between both lips of said U-shaped elastic seal ring is larger than the length of a bottom portion of said U-shaped elastic seal ring.
Claim 9
Dependent Claim
28 words
The oil seal device as claimed in claim 1, wherein said U-shaped elastic seal ring is made of a composite U-shaped metallic member and a U-shaped non-metallic member.
Claim 10
Dependent Claim
25 words
The oil seal device as claimed in claim 1, wherein said U-shaped elastic seal ring is made of metal coated with a synthetic rubber material.
Claim 11
Dependent Claim
23 words
The oil seal device as claimed in claim 9, wherein said coating material comprises the outer surface of said U-shaped elastic seal ring.
Claim 12
Dependent Claim
28 words
The oil seal device as claimed in claim 9, wherein said coating material covers at least the lips and the bottom portion of said U-shaped elastic seal ring.
Claim 13
Dependent Claim
24 words
The oil seal device as claimed in claim 1, wherein said U-shaped elastic seal ring is made of metal coated with a synthetic resin.
Claim 14
Dependent Claim
23 words
The oil seal device as claimed in claim 12, wherein said coating material comprises the outer surface of said U-shaped elastic seal ring.
Claim 15
Dependent Claim
28 words
The oil seal device as claimed in claim 12, wherein said coating material covers at least the lips and the bottom portion of said U-shaped elastic seal ring.
Claim 16
Dependent Claim
18 words
The oil seal device as claimed in claim 1, wherein said spring is made of a steel wire.
Claim 17
Dependent Claim
32 words
The oil seal device as claimed in claim 15, wherein the bottom portion of said U-shaped elastic seal ring is round to conform to the circular cross section of said steel wire.
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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |