US3685922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary piston internal combustion engine
Assignee: Daimler Benz AG
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Filing: 1970-06-03
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Granted: 1972-08-22
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Expires: 1990-06-03
Abstract
Abstract A rotary piston internal combustion engine, particularly of trochoidal construction, which has a piston that is provided at its corners with sealing bars which include support and wear parts with the latter forming the head portions; the wear part of the sealing bar is either superfinish-machined at its bottom side and, wetted with a lubricant, placed on the support part, also superfinish-machined at its corresponding surface, so that the wear part can be displaced parallel to its bottom side whereas it cannot be lifted perpendicularly to the bottom side by reason of the effect of the air pressure, or in which, in the alternative, the wear part of the sealing bar is subdivided perpendicularly to its longitudinal axis and each subdivided wear part is connected with the support part of the sealing bar at its bottom side within only a small area of its length by soldering, cementing or the like; the bottom side of the wear part or of the individual subparts of the wear part and/or the top side of the support part may also be provided with recesses which are preferably arranged symmetrically to the center of the length of the wear part or the length of its individual subparts, particularly along the longitudinal axis or pairwise symmetrically thereto.
Inventors
- 👤 Heinz Lamm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:52
CPC Classifications
F; F01; F01C; F01C19/00; F01C19/02; F01C19/04
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
178 words
A rotary piston internal combustion engine having a piston that is provided at its corners with sealing bar means that include support means and wear means, characterized in that the wear means and support means are made from different materials having different thermal expansions, in that they subdivide the sealing bar means in a substantially longitudinal direction with the wear means on the support means, and in that the wear means of the sealing bar possesses a superfinished bottom side and, Provided with a lubricant wetting the surface of the bottom side, is mounted on the support means also having a superfinished corresponding top surface where it faces the super finished bottom surface of the wear means, so that the wear means can be displaced parallel to its bottom side while a lifting thereof away from the support means is substantially impossible as a result of the effect of the air pressure, whence the wear means and support means are in effect a unitary structure adhering to one another yet can expand unimpairedly with respect to one another.
Claim 2
Dependent Claim
178 words
A rotary piston internal combustion engine having a piston that is provided at its corners with sealing bar means that include support means and wear means, characterized in that the wear means and support means are made from different materials having different thermal expansions, in that they subdivide the sealing bar means in a substantially longitudinal direction with the wear means on the support means, and in that the wear means of the sealing bar possesses a superfinished bottom side and, Provided with a lubricant wetting the surface of the bottom side, is mounted on the support means also having a superfinished corresponding top surface where it faces the super finished bottom surface of the wear means, so that the wear means can be displaced parallel to its bottom side while a lifting thereof away from the support means is substantially impossible as a result of the effect of the air pressure, whence the wear means and support means are in effect a unitary structure adhering to one another yet can expand unimpairedly with respect to one another.
Claim 3
Dependent Claim
24 words
A rotary piston internal combustion engine according to claim 1, characterized in that the sealing bar means is provided with a rounded-off head portion.
Claim 4
Dependent Claim
19 words
A rotary piston internal combustion engine according to claim 2, characterized in that the engine is of trochoidal construction.
Claim 5
Dependent Claim
35 words
A rotary piston internal combustion engine according to claim 1, characterized in that the bottom side of the wear means is constructed as a flat surface perpendicular to the flanks of the sealing bar means.
Claim 6
Dependent Claim
29 words
A rotary piston internal combustion engine according to claim 4, characterized in that the height of the wear means is approximately equal to the height of the support means.
Claim 7
Dependent Claim
34 words
A rotary piston internal combustion engine according to claim 4, characterized in that a chamber for the accommodation of a sealing bar spring is provided in the support means from the bottom side thereof.
Claim 8
Dependent Claim
46 words
A rotary piston internal combustion engine according to claim 6, characterized in that the width of the chamber corresponds approximately to half the width of the sealing bar means and the height of the chamber corresponds to approximately three-quarters the entire height of the support means.
Claim 9
Dependent Claim
29 words
A rotary piston internal combustion engine according to claim 7, characterized in that the height of the wear means is approximately equal to the height of the support means.
Claim 10
Dependent Claim
35 words
A rotary piston internal combustion engine according to claim 8, characterized in that the chamber is of substantially rectangular shape and is provided substantially in the center of the cross section of the support means.
Claim 11
Dependent Claim
40 words
A rotary piston internal combustion engine according to claim 1, characterized by recess means provided in at least one of the two sides consisting of the bottom side of the wear means and the top side of the support means.
Claim 12
Dependent Claim
29 words
A rotary piston internal combustion engine according to claim 10, characterized in that said recess means are provided in pairs symmetrically to the longitudinal axis of the corresponding part.
Claim 13
Dependent Claim
32 words
A rotary piston internal combustion engine according to claim 10, characterized in that the length of the recess means corresponds at least approximately to one-third the length of a respective wear means.
Claim 14
Dependent Claim
29 words
A rotary piston internal combustion engine according to claim 10, characterized in that the recess means are provided symmetrically to the center of the length of the wear means.
Claim 15
Dependent Claim
26 words
A rotary piston internal combustion engine according to claim 13, characterized in that the recess means are provided along the longitudinal axis of the corresponding part.
Claim 16
Dependent Claim
49 words
A rotary piston internal combustion engine according to claim 1, characterized in that the sealing bar means includes at least one center part and two corner parts, said center part being constituted by said wear means and support means subdivided substantially in the longitudinal direction of the center part.
Claim 17
Dependent Claim
44 words
A rotary piston internal combustion engine according to claim 15, characterized in that said corner parts are substantially triangularly shaped and are separated from the center part along mutually complimentary plane surfaces forming an acute angle to the longitudinal direction of the center part.
Claim 18
Dependent Claim
31 words
A rotary piston internal combustion engine according to claim 1, characterized in that the sealing bar means is subdivided substantially perpendicularly to its longitudinal plane by the wear and support means.
Claim 19
Dependent Claim
24 words
A rotary piston internal combustion engine according to claim 17, characterized in that the sealing bar means is provided with a rounded-off head portion.
Claim 20
Dependent Claim
35 words
A rotary piston internal combustion engine according to claim 17, characterized in that the bottom side of the wear means is constructed as a flat surface perpendicular to the flanks of the sealing bar means.
Claim 21
Dependent Claim
29 words
A rotary piston internal combustion engine according to claim 17, characterized in that the height of the wear means is approximately equal to the height of the support means.
Claim 22
Dependent Claim
40 words
A rotary piston internal combustion engine according to claim 17, characterized by recess means provided in at least one of the two sides consisting of the bottom side of the wear means and the top side of the support means.
References Cited (Backward Citations)
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US3400691A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |