US3791781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary piston internal combustion engine
Assignee: Mazda Motor Corp
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Filing: 1972-06-29
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Granted: 1974-02-12
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Expires: 1992-06-29
Abstract
Abstract In a rotary piston engine, anti-wear treatment such as metal spray, etc., is provided on a fixing surface of a center housing and side housings and particularly the fastening surface around the plug hole, in order to prevent abnormal wear of the fastening surface and the consequent disadvantage caused by abnormal wear.
Inventors
- 👤 T Fujiyama
- 👤 T Hamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:23
CPC Classifications
F; F02; F02B; F02B55/00; F02B55/08; F02B53/00; F02B2053/005; F02B2730/00; F02B2730/01; F02B2730/018; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
78 words
In a rotary piston internal combustion engine comprising a center housing having a trochoidal inner surface, side housings disposed at both sides of said center housing, fastening surfaces formed by mutually contacting surface portions of said housings, a rotary piston rotating planetarily through an eccentric shaft in a casing composed of said center housing and said side housings, the improvement wherein: said fastening surfaces only of at least one of said housings are provided with an anti-wear treatment.
Claim 2
Dependent Claim
78 words
In a rotary piston internal combustion engine comprising a center housing having a trochoidal inner surface, side housings disposed at both sides of said center housing, fastening surfaces formed by mutually contacting surface portions of said housings, a rotary piston rotating planetarily through an eccentric shaft in a casing composed of said center housing and said side housings, the improvement wherein: said fastening surfaces only of at least one of said housings are provided with an anti-wear treatment.
Claim 3
Dependent Claim
40 words
A rotary piston internal combustion engine as claimed in claim 1, wherein anti-wear treatment is provided on at least said fastening surface only around the plug hole and extending over at least a 60* rotating angle of the eccentric shaft.
Claim 4
Dependent Claim
19 words
A rotary piston internal combustion engine as claimed in claim 2, wherein; said anti-wear treatment comprises a metal spray.
Claim 5
Dependent Claim
40 words
A rotary piston internal combustion engine as claimed in claim 2, wherein: said anti-wear treatment is provided only on said fastening surface close to the combustion chamber and extends in long and narrow fashion, parallel with the trochoidal sliding surface.
Claim 6
Dependent Claim
21 words
A rotary piston internal combustion engine as claimed in claim 4, wherein: said anti-wear treatment is provided on said side housings.
Claim 7
Dependent Claim
26 words
A rotary piston internal combustion engine as claimed in claim 2, wherein: said anti-wear treatment is provided over the complete fastening surface of said center housing.
Claim 8
Dependent Claim
22 words
A rotary piston internal combustion engine as claimed in claim 6, wherein said anti-wear treatment is further provided on said side housings.
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |