Patent US3728995A successfully refreshed from Google Patents.
US3728995A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Accessory arrangement for a reciprocating internal combustion engine
Assignee: Avco Corp
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Filing: 1971-10-01
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Granted: 1973-04-24
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Expires: 1991-10-01
Abstract
Abstract The disclosure illustrates a reciprocating internal combustion engine where the idler gear between the crankshaft and camshaft gears drives an oil pump. A magneto drive gear also meshes with the crankshaft gear. A fuel pump and propeller governor are driven from the forward end of the camshaft. This greatly reduces the number of gears required for the accessory drive train. A few simple modifications enable the oil pump to deliver oil to the engine for forward or reverse engine rotation.
Inventors
- 👤 G Schramm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:09
CPC Classifications
F; F02; F02B; F02B67/00; F02B67/04; F01; F01M; F01M11/00; Y; Y10; Y10S; Y10S123/00; Y10S123/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
124 words
In a reciprocating internal combustion engine, the combination comprising: a crankcase; a crankshaft and camshaft journaled in said crankcase for rotation on parallel axes; a first gear secured to one end of said crankshaft; a second gear mounted on the end of the camshaft and defining a 2:1 speed reducing ratio relative to the first gear; an idler gear meshing witH the first and second gears; and an oil pump comprising: a housing secured to said crankcase; a pair of intermeshing gears journaled for rotation in said housing; a shaft connecting said idler gear and one of said intermeshing gears; said crankcase having first and second chambers positioned relative to said intermeshing gear housing to form inlet and outlet chambers for said oil pump.
Claim 2
Dependent Claim
124 words
In a reciprocating internal combustion engine, the combination comprising: a crankcase; a crankshaft and camshaft journaled in said crankcase for rotation on parallel axes; a first gear secured to one end of said crankshaft; a second gear mounted on the end of the camshaft and defining a 2:1 speed reducing ratio relative to the first gear; an idler gear meshing witH the first and second gears; and an oil pump comprising: a housing secured to said crankcase; a pair of intermeshing gears journaled for rotation in said housing; a shaft connecting said idler gear and one of said intermeshing gears; said crankcase having first and second chambers positioned relative to said intermeshing gear housing to form inlet and outlet chambers for said oil pump.
Claim 3
Dependent Claim
36 words
Apparatus as in claim 1 wherein said oil pump further comprises: an internally splined accessory driving connection on said shaft; and means for removably mounting an accessory on said oil pump housing to be driven thereby.
Claim 4
Dependent Claim
86 words
Apparatus as in claim 1 wherein: said crankcase has an inlet supply line extending from an oil supply and into one of said chambers; the other of said chambers being positioned so that it is intercepted by an extension of the longitudinal axis of said inlet supply line; said crankcase has a passageway extending from the other of said chambers for distribution to the engine components; whereby said pump pressurizes lubricant for supply to said engine components when said crankshaft is rotating in a first direction.
Claim 5
Dependent Claim
68 words
Apparatus as in claim 3 further comprising: means for forming a passageway from said inlet passage through said first chamber and into said second chamber whereby said second chamber forms the inlet for said pump; means for forming a passageway from said first chamber and through said second chamber to said outlet passage; whereby said oil pump pressurizes lubricant for delivery to said engine in an opposite direction.
Claim 6
Dependent Claim
26 words
Apparatus as in claim 4 wherein said means for forming said passageways comprise tubes received in openings formed in said crankcase and said oil pump housing.
Claim 7
Dependent Claim
51 words
Apparatus as in claim 3 wherein: said crankcase has first and second halves; said output passageway extends from one crankcase half to the other and across the joint therebetween and said apparatus further comprises a tubular element sealingly received in said passageway and extending across the junction between said crankcase halves.
Claim 8
Dependent Claim
65 words
Apparatus as in claim 5 wherein: said crankcase comprises first and second halves; said output passageway extends from one crankcase half to the other and through the junction therebetween; the means forming a passageway through said second chamber comprises a tubular element extending through said second chamber and across the junction between said crankcase halves thereby forming a pilot for the alignment of said halves.
Claim 9
Dependent Claim
30 words
Apparatus as in claim 1 further comprising: a drive gear meshing with the crankshaft gear; and a magneto assembly bolted to said crankcase and driven by said accessory drive gear.
Claim 10
Dependent Claim
46 words
Apparatus as in claim 1 further comprising: a cam lobe secured to the end of said camshaft opposite said second gear; and a fuel pump assembly having a reciprocable input lever secured to said crankcase so that the reciprocable lever is actuated by said cam lobe.
Claim 11
Dependent Claim
95 words
Apparatus as in claim 9 further comprising a splined output shaft journaled for rotation in said crankcase about an axis normal to the axis of rotation of said camshaft; a bevel gear mounted on said output shaft; a bevel gear coaxial with and splined to said camshaft and meshing with the bevel gear on said output shaft, said last-mentioned bevel gear abutting an axial thrust face for positioning relative to said first-mentioned bevel gear, said last-mentioned bevel gear being slidably mounted relative to said camshaft whereby the thermal expansion of said camshaft is compensated for.
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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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |