US4957077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camshaft driving arrangement for double overhead camshaft engine
Assignee: Nissan Motor Co Ltd
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Filing: 1989-12-14
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Granted: 1990-09-18
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Expires: 2009-12-14
Abstract
Abstract A camshaft driving arrangement for a DOHC engine comprises two pairs of cam sprockets, each pair being mounted to each of the camshafts at one end thereof, and two idler gears, each being rotatably mounted to one of the cylinder heads. A first camshaft driving chain drivingly interconnects one of the idler gears and the adjacent pair of the cam sprockets. On the other hand, a second camshaft driving chain drivingly interconnects the other of the idler gears and the other pair of the cam sprockets. The second camshaft driving chains have different running planes which are axially spaced along the axis of the crankshaft.
Inventors
- 👤 Nobuyuki Okitsu
- 👤 Masaru Mitsuhashi
- 👤 Yoshio Iwasa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:52
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/02; F01L1/024; F01L1/022; F01L1/04; F01L1/047; F01L1/053; F01L2001/0537; F02; F02B; F02B2275/00; F02B2275/08; F02B2275/18; F02B75/00; F02B75/16; F02B75/18; F02B75/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
160 words
In a DOHC engine having a cylinder block including two cylinder banks angularly disposed to each other, two cylinder heads mounted on the two cylinder banks, respectively, two pairs of camshafts, each pair being rotatably mounted to one of the two cylinder heads, and a crankshaft mounted to the cylinder block, a camshaft driving arrangement comprising: two pairs of cam sprockets, each pair being mounted to each of the camshafts at one end thereof; two idler gears, each being rotatably mounted to one of the cylinder heads; a first camshaft driving chain drivingly interconnecting one of said idler gears and the adjacent pair of said cam sprockets; a second camshaft driving chain drivingly interconnecting the other of said idler gears and the other pair of said cam sprockets, said first and second camshaft driving chains having different running planes which are axially spaced along the axis of the crankshaft; and means for drivingly interconnecting the crankshaft and said idler gears.
Claim 2
Dependent Claim
160 words
In a DOHC engine having a cylinder block including two cylinder banks angularly disposed to each other, two cylinder heads mounted on the two cylinder banks, respectively, two pairs of camshafts, each pair being rotatably mounted to one of the two cylinder heads, and a crankshaft mounted to the cylinder block, a camshaft driving arrangement comprising: two pairs of cam sprockets, each pair being mounted to each of the camshafts at one end thereof; two idler gears, each being rotatably mounted to one of the cylinder heads; a first camshaft driving chain drivingly interconnecting one of said idler gears and the adjacent pair of said cam sprockets; a second camshaft driving chain drivingly interconnecting the other of said idler gears and the other pair of said cam sprockets, said first and second camshaft driving chains having different running planes which are axially spaced along the axis of the crankshaft; and means for drivingly interconnecting the crankshaft and said idler gears.
Claim 3
Dependent Claim
42 words
A camshaft driving arrangement as claimed in claim 1, wherein said drivingly interconnecting means include two crank sprockets rotatable with the crankshaft and two timing chains, each interconnecting one of said two crank sprockets and the corresponding one of said idler gears.
Claim 4
Dependent Claim
53 words
A camshaft driving arrangement as claimed in claim 2, wherein said idler gears include a first gear and a second gear, said first gears of said idler gears being engaged by said first and second timing chains, respectively, said second gears of said idler gears being engaged by said camshaft timing chains, respectively.
Claim 5
Dependent Claim
35 words
A camshaft driving arrangement as claimed in claim 3, wherein said second gear of each of said idler gears is disposed axially outward with respect to the crankshaft more than said first gear thereof is.
Claim 6
Dependent Claim
28 words
A camshaft driving arrangement as claimed in claim 4, wherein said first gear of each of said idler gears is larger in diameter than said second gear thereof.
References Cited (Backward Citations)
JPS57210110A
Cited
US4553473A
Cited
US4716864A
Cited
US4750455A
Cited
US4729348A
Cited
JPS6312808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-17 | 1994-03-19 | 1994-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-17 | 1998-03-19 | 1998-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-17 | 2002-03-19 | 2002-09-18 | $7700.00 | Window Closed / Lapsed |