Patent US3904329A successfully refreshed from Google Patents.
US3904329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary piston combustion engine of trochoid type
Assignee: Audi AG
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Filing: 1974-03-18
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Granted: 1975-09-09
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Expires: 1994-03-18
Abstract
Abstract A trochoid-type rotary piston combustion engine has a housing composed of at least one shell and at least two parallel end parts as well as an inlet and an outlet passage equipped with a throttle. Each shell is arranged between two end parts connected thereto by tension bolts to bound an interior space in which is rotatably arranged a multi-arcuate piston. The piston is provided with sealing members slidable along the inner faces of said housing. Lubrication of the housing inner face is in the form of a lubricating oil supply orifice opening into the intake chamber.
Inventors
- 👤 Johannes Steinwart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:04
CPC Classifications
F; F01; F01M; F01M3/00; F02; F02B; F02B53/00; F02B2053/005; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
158 words
A Rotary piston combustion engine of trochoid type having a housing composed of at least one shell and at least two parallel end parts and comprising an inlet passage provided with a throttle and an outlet passage, each shell being arranged between two end parts and being connected thereto to bound an interior space, a multi-apex piston rotatably arranged in the space and provided with sealing members sliding along the inner surfaces of the housing, an air passage communicating with the atmosphere at one end and opening into the intake chamber near the inlet passage at the other end, an air throttling means arranged within said air passage and coupled with the throttle, which means affords a small flow cross section when the throttle is closed, and a progressively enlarging flow cross-section as the throttle progressively opens, and lubricant supply means including a lubricant supply passage opening into said air passage for providing lubrication of said inner surfaces.
Claim 2
Dependent Claim
158 words
A Rotary piston combustion engine of trochoid type having a housing composed of at least one shell and at least two parallel end parts and comprising an inlet passage provided with a throttle and an outlet passage, each shell being arranged between two end parts and being connected thereto to bound an interior space, a multi-apex piston rotatably arranged in the space and provided with sealing members sliding along the inner surfaces of the housing, an air passage communicating with the atmosphere at one end and opening into the intake chamber near the inlet passage at the other end, an air throttling means arranged within said air passage and coupled with the throttle, which means affords a small flow cross section when the throttle is closed, and a progressively enlarging flow cross-section as the throttle progressively opens, and lubricant supply means including a lubricant supply passage opening into said air passage for providing lubrication of said inner surfaces.
Claim 3
Dependent Claim
84 words
A rotary piston combustion engine according to claim 1 in which tension bolts assemble the shell and end parts and an enlarged hole receives each bolt, the passage in communication with the atmosphere leads from the axial midpoint of the shell outer surface in a radial direction and opens into an enlarged tension bolt hole nearest the inlet passage, and the adjacent faces of the end parts each provided with a groove extending from the bolt hole to a point in the intake chamber.
Claim 4
Dependent Claim
34 words
A rotary piston combustion engine according to claim 2 in which the cross-section of the groove in the end part has a profile guiding the flow obliquely radially outward towards the shell inner surface.
Claim 5
Dependent Claim
36 words
A rotary piston combustion engine according to claim 2 in which the groove opens into the intake chamber near the inlet port in the region where the tilting angle of the radial sealing strips is greatest.
Claim 6
Dependent Claim
58 words
A rotary piston combustion engine according to claim 1 in which the air throttling means includes a throttle and a rotary control valve determining the volume of air flow, arranged on the shaft of the throttle, the valve being enclosed by a housing provided with one air inlet and one air outlet coupled with the enlarged bolt hole.
Claim 7
Dependent Claim
27 words
A rotary piston combustion engine according to claim 1 in which a spring-loaded check valve opens under oil pressure arranged in the piping of the lubricant orifice.
Claim 8
Dependent Claim
30 words
A rotary piston combustion engine according to claim 1 in which means are provided for connecting the air passage to a source of fuel during cold starting of the engine.
References Cited (Backward Citations)
US3838950A
Cited
US3771903A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |