US3812677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot gas engine with co-axial cylinder bores of differing diameter
Assignee: United Stirling AB and Co
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Filing: 1972-12-15
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Granted: 1974-05-28
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Expires: 1992-12-15
Abstract
Abstract A Stirling engine has two cylinders one having a higher and one having a lower pressure working space interconnected by a regenerator cooler array. The two cylinders and accompanying pistons are disposed at 90* with each cylinder having co-axial bores and associated pistons of different diameters separated by shoulder surfaces having sharp edges. A crankcase is disposed adjacent the larger diameter bores of both cylinders. A space between the two cylinders is connected to the crankcase by a conduit including a non-return valve, and the crankcase is connected to the lower pressure working space by a conduit with a restricted area orifice or a non-return valve.
Inventors
- 👤 I Greis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:08
CPC Classifications
F; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G1/053; F02G2244/00; F02G2244/02; F02G2244/06; F02G2244/10; F02G2270/00; F02G2270/50; F02G2270/95
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
59 words
A Stirling hot gas engine comprising in combination two cylinders having pistons therein and respective high and low pressure working spaces connected by a regenerator-cooling assembly, wherein each cylinder has two co-axial parts of different diameter providing a shoulder surface therebetween, and a piston assembly with two different diameter pistons operating in each cylinder in the respective associated parts.
Claim 2
Dependent Claim
59 words
A Stirling hot gas engine comprising in combination two cylinders having pistons therein and respective high and low pressure working spaces connected by a regenerator-cooling assembly, wherein each cylinder has two co-axial parts of different diameter providing a shoulder surface therebetween, and a piston assembly with two different diameter pistons operating in each cylinder in the respective associated parts.
Claim 3
Dependent Claim
20 words
An engine as defined in claim 1, wherein a crankcase connects the two larger diameter parts of saId two cylinders.
Claim 4
Dependent Claim
56 words
An engine as defined in claim 2, wherein a space is provided in the cylinder between the two pistons of each piston assembly, and including a conduit with a non-return valve connected between the said spaces of each cylinder and the crankcase in a direction to permit gas flow only in the direction toward the crankcase.
Claim 5
Dependent Claim
25 words
An engine as defined in claim 1, including a conduit connected between said crankcase and one working space including means offering resistance against gas flow.
Claim 6
Dependent Claim
19 words
An engine as defined in claim 4, wherein the means offering resistance comprises a restricted portion of the conduit.
Claim 7
Dependent Claim
14 words
An engine as defined in claim 4, wherein said conduit includes oil filtering means.
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) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |