Patent US4295807A successfully refreshed from Google Patents.
US4295807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine with oil pump gear surrounding and driven by crankshaft
Assignee: Volkswagen AG
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Filing: 1979-07-20
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Granted: 1981-10-20
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Expires: 1999-07-20
Abstract
Abstract An internal combustion engine having a rotating crankshaft mounted on at least one main bearing is provided with an oil pump having at least one gear surround the crankshaft and rotationally driven by the crankshaft. The pump gear surrounds the main bearing so that the main bearing and the oil pump occupy a common axial space on the crankshaft.
Inventors
- 👤 Hermann Kruger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:39
CPC Classifications
F; F01; F01M; F01M1/00; F01M1/02; F01M2001/0207; F01M2001/0238; F01M2001/0253; F01M2001/0269
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
76 words
In an internal combustion engine having a crankshaft mounted for rotation on at least one main crankshaft bearing and having a gear oil pump directly driven by said crankshaft and including at least one gear surrounding said crankshaft and rotationally driven by said crankshaft, the improvement wherein said gear also surrounds said main bearing and forms an operative gear of said pump whereby said bearing and said oil pump occupy common axial space on said crankshaft.
Claim 2
Dependent Claim
76 words
In an internal combustion engine having a crankshaft mounted for rotation on at least one main crankshaft bearing and having a gear oil pump directly driven by said crankshaft and including at least one gear surrounding said crankshaft and rotationally driven by said crankshaft, the improvement wherein said gear also surrounds said main bearing and forms an operative gear of said pump whereby said bearing and said oil pump occupy common axial space on said crankshaft.
Claim 3
Dependent Claim
26 words
The improvement as described in claim 1, wherein there are provided end face driving means connecting said gear to an adjacent crank web of said crankshaft.
Claim 4
Dependent Claim
30 words
The improvement as described in claim 2, wherein said end face driving means comprise driver bolts for connecting in a torsion resistent manner said gear and said adjacent crank web.
Claim 5
Dependent Claim
32 words
The improvement as described in claim 1 or 2, wherein said oil pump is a rotary pump and includes a second gear and wherein said second gear surrounds said crankshaft main bearing.
Claim 6
Dependent Claim
40 words
The improvement as described in claim 1 or 2, wherein there is provided a housing for said pump and wherein said crankshaft main bearing is arranged in a cylindrical zone of said housing and said gear surrounds said cylindrical zone.
Claim 7
Dependent Claim
51 words
The improvement as described in claim 5, wherein said crankshaft main bearing is an external bearing, wherein said oil pump housing is provided with a cylindrical extension for lodging a crankshaft seal, and wherein there is provided a pulley on said crankshaft having an axially extending recess for receiving said extension.
Claim 8
Dependent Claim
31 words
The improvement as described in claim 6, wherein said housing includes oil ducts arranged in projecting portions of said housing, said projecting portions lying at a radial distance outside said pully.
Claim 9
Dependent Claim
31 words
The improvement as described in claim 6, wherein said housing includes oil ducts arranged in projecting portions of said housing, said portions projecting into said axially extending recess of said pulley.
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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) | 1984-10-19 | 1985-04-20 | 1985-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-19 | 1989-04-20 | 1989-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-19 | 1993-04-20 | 1993-10-20 | $7700.00 | Window Closed / Lapsed |