US4898130A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve mechanisms
Assignee: Jaguar Land Rover Ltd
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Filing: 1989-05-05
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Granted: 1990-02-06
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Expires: 2009-05-05
Abstract
Abstract A valve mechanism includes a poppet type valve, a valve lever pivotally mounted at one end and attached at the other end to the end of the stem of the valve, the valve lever defines a track in which is located a drive pin and a drive mechanism is arranged to drive the drive pin in oscillatory manner; the track has a first portion which, when the valve is closed is engaged by the drive pin and coincides with the path of the drive pin, and a second portion which diverges from the path of the drive pin so that when engaged by the drive pin movement of the drive pin will cause the valve lever to move, opening and closing the valve. Preferably the mean position of oscillation of the drive pin is adjustable so that the duration and amplitude of valve opening may be varied.
Inventors
- 👤 Bryan N. V. Parsons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:26
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/02; F01L1/10; F01L1/30; F01L13/00; F01L13/0015
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
156 words
A valve mechanism comprising; a valve having a valve stem which is located for axial movement in a valve guide and a valve head adapted at one extreme of movement of the valve to locate against and close a valve seat; a valve lever pivotally mounted at one end and attached adjacent the other end to the end of the valve stem remote from the valve head; said valve lever defining a track; a drive pin permanently engaging said track and drive means to drive said drive pin in oscillatory manner; said track having a first portion which, when the valve is closed, is engaged by the drive pin and coincides with the path of the drive pin and a second portion which diverges from the path of the drive pin, so that engagement of the second portion by the drive pin will cause the valve lever to move to positively open and close the valve.
Claim 2
Dependent Claim
156 words
A valve mechanism comprising; a valve having a valve stem which is located for axial movement in a valve guide and a valve head adapted at one extreme of movement of the valve to locate against and close a valve seat; a valve lever pivotally mounted at one end and attached adjacent the other end to the end of the valve stem remote from the valve head; said valve lever defining a track; a drive pin permanently engaging said track and drive means to drive said drive pin in oscillatory manner; said track having a first portion which, when the valve is closed, is engaged by the drive pin and coincides with the path of the drive pin and a second portion which diverges from the path of the drive pin, so that engagement of the second portion by the drive pin will cause the valve lever to move to positively open and close the valve.
Claim 3
Dependent Claim
17 words
A valve mechanism according to claim 1 in which the drive pin oscillates in an arcuate path.
Claim 4
Dependent Claim
115 words
A valve mechanism according to claim 2 in which the drive pin is provided on an intermediate lever, said intermediate lever being pivotally mounted for rotation about an axis parallel to the axis of rotation of the valve lever; a drive link is pivotally connected at one end to the intermediate lever and at the other end to a crank on a drive shaft, so that upon rotation of the drive shaft the intermediate lever and drive pin thereon will oscillate about its pivot; the first portion of the track on the valve lever being arcuate having a radius equal to the separation between the pivot of the intermediate lever and the drive pin thereon.
Claim 5
Dependent Claim
17 words
A valve mechanism according to claim 3 in which the second portion of the track is straight.
Claim 6
Dependent Claim
47 words
A valve mechanism according to claim 4 in which the valve lever is bifurcated having parallel limbs which define therebetween the straight second portion of the track, the upper limb being extended, the lower edge of the extended portion defining the circular first portion of the track.
Claim 7
Dependent Claim
18 words
A valve mechanism according to claim 1 in which the drive pin in driven in linear reciprocating manner.
Claim 8
Dependent Claim
41 words
A valve mechanism according to claim 6 in which the first portion of the track is disposed towards the end of the valve lever connected to the valve stem and is straight while the second portion of the track is curved.
Claim 9
Dependent Claim
23 words
A valve mechanism according to claim 1 in which means is provided for varying the mean position of oscillation of the drive pin.
Claim 10
Dependent Claim
48 words
A valve mechanism according to claim 8 in which the drive pin is driven by a crank on a drive shaft via an intermediate pivotted lever, means being provided for varying the separation between the axis of the drive shaft and the pivotal axis of the intermediate lever.
Claim 11
Dependent Claim
63 words
A valve mechanism according to claim 9 in which the drive shaft is mounted in a bearing formed eccentrically of a support disc, the disc being rotatably supported such that upon rotation of the disc, separation between the axis of the drive shaft and the pivotal axis of the intermediate lever will be adjusted, means being provided for rotation of the support disc.
Claim 12
Dependent Claim
38 words
A valve mechanism according to claim 10 in which an internal gear mounted on the drive shaft meshes with a drive gear, the axis of rotation of the drive gear coinciding with the centre of the support disc.
Claim 13
Dependent Claim
20 words
A valve mechanism according to claim 11 in which the drive gear is half the diameter of the internal gear.
Claim 14
Dependent Claim
27 words
A valve mechanism according to claim 9 in which means is provided for varying the distance between the axis of the drive shaft and the drive pin.
Claim 15
Dependent Claim
46 words
A valve mechanism according to claim 13 in which the drive pin is mounted eccentrically on a journal pivotally mounted on an intermediate lever, means being provided for rotation of the journal to vary the separation between the axis of the drive shaft and drive pin.
Claim 16
Dependent Claim
31 words
A valve mechanism according to claim 8 in which the means for varying the mean position of oscillation of the drive pin is controlled as a function of the engine speed.
Claim 17
Dependent Claim
32 words
A valve mechanism according to claim 8 in which the means for varying the mean position of oscillation of the drive pin is controlled to control the power output of the engine.
Claim 18
Dependent Claim
30 words
A valve mechanism according to claim 1 in which the valve stem is attached to the valve lever in a manner which will permit limited pivotal and axial movement therebetween.
Claim 19
Dependent Claim
30 words
A valve mechanism according to claim 17 in which a ball on the end of the valve stem engages in a cylindrical hole in the end of the valve lever.
Claim 20
Dependent Claim
30 words
A valve mechanism according to claim 17 in which resilient means acts on the valve lever in order to ensure that the valve is seated when in its closed position.
Claim 21
Dependent Claim
41 words
A multi-valve assembly comprising a plurality of valve mechanisms as claimed in claim 1, the valve mechanisms having a common drive shaft, each mechanism being driven by a crank on the drive shaft, the cranks being arranged in appropriate phase relationship.
Claim 22
Dependent Claim
34 words
A multi-valve assembly according to claim 20 in which the common drive shaft is supported eccentrically at axially spaced locations by a plurality of support discs, the support discs being interconnected for adjustment purposes.
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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) | 1993-02-05 | 1993-08-07 | 1994-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-05 | 1997-08-07 | 1998-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-05 | 2001-08-07 | 2002-02-06 | $7700.00 | Window Closed / Lapsed |