US3830598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Housings for rotary combustion engines
Assignee: Wankel GmbH
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Filing: 1973-01-05
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Granted: 1974-08-20
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Expires: 1993-01-05
Abstract
Abstract Die-cast housings for rotary combustion engines of the trochoidal type, having parallel side plates spaced apart by an annular peripheral shell, the side plates being double-walled and having the exterior wall of greater radial extent than the inner wall with internal coolant passages therebetween opening generally radially outwardly, the peripheral shell also being double-walled and having the exterior wall of greater axial extent than the inner wall and having axial internal coolant passages therebetween, the axial extensions of the peripheral shell abutting the radial extensions of the side plates and thereby placing the passages of the shell in communication with those of the side plates, the side plates being rendered suitable for pressure die-casting by reason of the radial openings of their passages.
Inventors
- 👤 M Ruf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:55
CPC Classifications
F; F02; F02B; F02B55/00; F02B55/16; F01; F01C; F01C21/00; F01C21/10; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49231; Y10T29/49234; Y10T29/49826; Y10T29/49879
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
169 words
A housing for rotary internal combustion engines having at least two double-walled side plates and at least one doublewalled annular peripheral shell disposed between the side plates and bearing sealingly against the inner face of the side plates, wherein the improvement comprises: a. the side plates being die castings having a plurality of internal coolant passages between the double walls thereof, the passages having apertures disposed around the circumference of the side plates and opening in the generally radially outward direction, b. the peripheral wall being a die casting having a plurality of internal coolant passages between the double walls thereof and having apertures opening in the axial direction, c. the outer wall of the double-walled shell having an axial extension of greater axial length than the inner wall thereof, the axial extension of the outer wall being sufficient to cover the radial openings of the side plate coolant passages in such a manner that each of the side plate passages is in communication with a peripheral shell passage.
Claim 2
Dependent Claim
169 words
A housing for rotary internal combustion engines having at least two double-walled side plates and at least one doublewalled annular peripheral shell disposed between the side plates and bearing sealingly against the inner face of the side plates, wherein the improvement comprises: a. the side plates being die castings having a plurality of internal coolant passages between the double walls thereof, the passages having apertures disposed around the circumference of the side plates and opening in the generally radially outward direction, b. the peripheral wall being a die casting having a plurality of internal coolant passages between the double walls thereof and having apertures opening in the axial direction, c. the outer wall of the double-walled shell having an axial extension of greater axial length than the inner wall thereof, the axial extension of the outer wall being sufficient to cover the radial openings of the side plate coolant passages in such a manner that each of the side plate passages is in communication with a peripheral shell passage.
Claim 3
Dependent Claim
45 words
The combination recited in claim 1, wherein the outer walls of the double-walled side plates extend radially outwardly beyond the inner walls, and the axial extensions of the outer shell wall have axial end faces bearing sealingly against the outer wall of the side plates.
Claim 4
Dependent Claim
23 words
The combination recited in claim 1, wherein the axial extensions of the peripheral shell are integral with the outer wall of the shell.
Claim 5
Dependent Claim
32 words
The combination recited in claim 1, wherein the axial extensions of the peripheral shell are separate annular parts which cooperate sealingly with the end faces of the outer wall of the shell.
Claim 6
Dependent Claim
69 words
The combination recited in claim 1, wherein the housing has a plurality of axially aligned annular peripheral shells, and a die cast double-walled intermediate side plate disposed between adjacent shells, the intermediate side plate having internal coolant passages opening generally radially outwardly, the passage openings of the intermediate side plate being covered by an axial extension of at least one adjacent shell and in communication with the shell passages.
Claim 7
Dependent Claim
33 words
The combination recited in claim 5, wherein the intermediate side plate is completely covered by axial extensions of both adjacent shells, the axial extensions having end faces which bear sealingly against each other.
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) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |