US4503818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable valve timing arrangement for an internal combustion engine or the like
Assignee: Nissan Motor Co Ltd
•
Filing: 1982-05-05
•
Granted: 1985-03-12
•
Expires: 2002-05-05
Abstract
Abstract The present invention features a valve train for inducing reciprocative motion in a valve which includes a lever pivotally mounted at one end thereof, a rocker arm which engages the lever to define a fulcrum point therebetween, and which engages a valve at one end thereof, a first cam which engages the other end of the rocker arm, a second cam which engages the top of the lever and a mechanism which guidingly interconnects the rocker arm, at a point intermediate of the ends thereof, with the lever for preventing relative slip therebetween and for ensuring that a cam following portion of the rocker arm smoothly follows the first cam.
Inventors
- 👤 Seinosuke Hara
- 👤 Kazuyuki Miisho
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:30
CPC Classifications
F; F01; F01L; F01L13/00; F01L13/0015; F01L13/0021; F01L13/0026
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
157 words
A valve train for inducing reciprocative motion in a valve comprising: a lever pivotally mounted at one end thereof; a rocker arm engaging said lever to define a fulcrum point therebetween, said rocker arm engaging said valve at a first end thereof; a mechanism guidingly interconnecting said rocker arm at a point intermediate of the ends thereof with said lever; first means engaging one of a pair of elements comprising said lever and a second end of said rocker arm for inducing reciprocative motion therein; and second means engaging the other of said pair of elements comprising said lever and said second end of said rocker arm for selectively controlling the angular position thereof with respect to said valve; wherein said mechanism comprises: a shaft rotatbly disposed through said rocker arm; means defining a guide slot in said lever for slidably receiving said rotatable shaft; and spring means for biasing said lever and said rocker arm apart.
Claim 2
Dependent Claim
157 words
A valve train for inducing reciprocative motion in a valve comprising: a lever pivotally mounted at one end thereof; a rocker arm engaging said lever to define a fulcrum point therebetween, said rocker arm engaging said valve at a first end thereof; a mechanism guidingly interconnecting said rocker arm at a point intermediate of the ends thereof with said lever; first means engaging one of a pair of elements comprising said lever and a second end of said rocker arm for inducing reciprocative motion therein; and second means engaging the other of said pair of elements comprising said lever and said second end of said rocker arm for selectively controlling the angular position thereof with respect to said valve; wherein said mechanism comprises: a shaft rotatbly disposed through said rocker arm; means defining a guide slot in said lever for slidably receiving said rotatable shaft; and spring means for biasing said lever and said rocker arm apart.
Claim 3
Dependent Claim
24 words
A valve train as claimed in claim 1 wherein said slot defining means takes the form of a fork which depends from said lever.
Claim 4
Dependent Claim
41 words
A valve train as claimed in claim 2, wherein said spring means takes the form of a coil spring having one end disposed in a spring retainer formed in said fork and the other end in engagement with said rotatable shaft.
Claim 5
Dependent Claim
23 words
A valve train as claimed in claim 2, further comprising a retainer which interconnects the ends of said fork and closes said slot.
Claim 6
Dependent Claim
59 words
A valve train as claimed in claim 1, wherein said lever is mounted on a stationary shaft through an eccentric bush, and wherein said lever includes a clamp for releasably locking said eccentric bush in a selected position with respect to said lever, said bush permitting the adjustment of the clearance defined between the rocker arm and said valve.
Claim 7
Dependent Claim
38 words
A valve train as set forth in claim 1, wherein said spring means takes the form of a coil spring interposed between a spring retainer formed in said rocker arm and a spring retainer formed in said lever.
Claim 8
Dependent Claim
37 words
A valve train as claimed in claim 1, wherein said spring means is a torsion spring detachably fixed at one end to said lever by a bolt and which engages at its other end said rotatable shaft.
Claim 9
Dependent Claim
24 words
A valve train as claimed in claim 1, wherein said slot is curved for reducing relative slip between said rocker arm and said lever.
Claim 10
Dependent Claim
32 words
A valve train as claimed in claim 1, further comprising a push rod interposed between said first means and said one of said lever and said second end of said rocker arm.
Claim 11
Dependent Claim
19 words
A valve train as claimed in claim 1, wherein said first means is a cam which is continuously rotatable.
Claim 12
Dependent Claim
22 words
A valve train as claimed in claim 1, wherein said second means is a cam which is selectively rotatable by an actuator.
Claim 13
Dependent Claim
49 words
A valve train as claimed in claim 1, wherein said rocker arm is formed with a curved apex and said lever is formed with a concave section adapted to receive said curved apex in a manner to reduce the surface pressure generated between said rocker arm and said lever.
Claim 14
Dependent Claim
119 words
In a valve train for inducing reciprocative motion in a valve: a lever pivotally mounted at one end thereof; a rocker arm engaging said lever to define a fulcrum point therebetween, said rocker arm engaging said valve at a first end thereof; a mechanism guidingly interconnecting said rocker arm at a point intermediate of the ends thereof with said lever; first means engaging one of a pair of elements comprising said lever and a second end of said rocker arm for inducing reciprocative motion therein; and second means engaging the other of said pair of elements comprising said lever and said second end of said rocker arm for selectively controlling the angular position thereof with respect to said valve.
Claim 15
Dependent Claim
119 words
In a valve train for inducing reciprocative motion in a valve: a lever pivotally mounted at one end thereof; a rocker arm engaging said lever to define a fulcrum point therebetween, said rocker arm engaging said valve at a first end thereof; a mechanism guidingly interconnecting said rocker arm at a point intermediate of the ends thereof with said lever; first means engaging one of a pair of elements comprising said lever and a second end of said rocker arm for inducing reciprocative motion therein; and second means engaging the other of said pair of elements comprising said lever and said second end of said rocker arm for selectively controlling the angular position thereof with respect to said valve.
Claim 16
Dependent Claim
32 words
A valve train as claimed in claim 13, wherein said mechanism guidingly interconnecting said rocker arm with said lever comprises means for preventing relative slippage between said rocker arm and said lever.
References Cited (Backward Citations)
DE209739C
Cited
US1710291A
Cited
US777295A
Cited
US1691991A
Cited
US2997991A
Cited
US3413965A
Cited
US3470857A
Cited
US3641988A
Cited
DE2335634A1
Cited
US3913548A
Cited
US4138973A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-11 | 1988-09-10 | 1989-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-11 | 1992-09-10 | 1993-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-11 | 1996-09-10 | 1997-03-12 | $7700.00 | Window Closed / Lapsed |