US3892028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing a housing casing for a rotary piston internal combustion engine
Assignee: Daimler Benz AG
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Filing: 1973-02-01
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Granted: 1975-07-01
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Expires: 1993-02-01
Abstract
Abstract A method for manufacturing a housing casing for a rotary piston internal combustion engine, especially of trochoidal construction, as well as the housing casing made according to this method, whereby the housing casing consists of light metal whose internal running surface for the piston consists of a coating of hard material; the method thereby involves leaving during the machining of the inner wall of the housing casing a material island of such light metal about the discharge opening of the already bored or still to be bored spark-plug-firing channel, whose height corresponds at least to the thickness of the coating to be subsequently provided along the inner contour of the housing casing in the finish-machined condition; as a result thereof the area of the discharge opening of the firing channel is constituted exclusively of such light metal.
Inventors
- 👤 Helmut Dobler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:33
CPC Classifications
F; F02; F02B; F02B55/00; F02B55/08; F02B1/00; F02B1/02; F02B1/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49231; Y10T29/49234; Y10T29/4998; Y10T29/49982; Y10T29/49986
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
193 words
A method for producing a housing casing for a rotary piston internal combustion engine, the engine casing consisting of a light metal and including a piston running surface consisting of a coating of a hard material, and a spark-plug-firing channel terminating in the piston running surface, the method comprising the steps of: machining the inner wall of the housing casing to a predetermined contour, leaving during the machining of the inner wall of the housing casing a material island of the light metal material of the housing casing projecting out from the inner wall of the housing casing within the area assigned to the discharge opening of the spark-plug-firing channel, providing a coating of hard material along the inner contour of the housing casing in the machined condition, said material island having a height corresponding at least to the thickness of said coating material, applying the coating of the hard material provided along the inner contour of the housing casing also over the material island, and removing the portion of the hard material coating lying on the material island during the finish-machining operation of the running surface formed by the hard material coating.
Claim 2
Independent Claim
193 words
A method for producing a housing casing for a rotary piston internal combustion engine, the engine casing consisting of a light metal and including a piston running surface consisting of a coating of a hard material, and a spark-plug-firing channel terminating in the piston running surface, the method comprising the steps of: machining the inner wall of the housing casing to a predetermined contour, leaving during the machining of the inner wall of the housing casing a material island of the light metal material of the housing casing projecting out from the inner wall of the housing casing within the area assigned to the discharge opening of the spark-plug-firing channel, providing a coating of hard material along the inner contour of the housing casing in the machined condition, said material island having a height corresponding at least to the thickness of said coating material, applying the coating of the hard material provided along the inner contour of the housing casing also over the material island, and removing the portion of the hard material coating lying on the material island during the finish-machining operation of the running surface formed by the hard material coating.
Claim 3
Dependent Claim
26 words
A method according to claim 1, characterized in that the firing channel is bored prior to the machining of the inner wall providing the material island.
Claim 4
Dependent Claim
22 words
A method according to claim 1, characterized in that the spark-plug-firing channel is bored only after the formation of the material island.
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) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |