Patent US4572118A successfully refreshed from Google Patents.
US4572118A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable valve timing for four-stroke engines
Assignee: Individual
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Filing: 1982-12-29
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Granted: 1986-02-25
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Expires: 2002-12-29
Abstract
Abstract A device for internal combustion engines particularly automobile engines, which varies the opening duration and the lift of the timing valves. This variation results from the utilization of all or part of the profile of an alternating cam of which the motion about an axis is provided by rotating main cams which contact rollers carried on the alternating cam, and is transmitted to a roller in contact with the lever which then actuates the valve. The timing is varied by adjusting the position of the roller by means of support arms by which the roller is displaced with respect to the alternating cam and lever.
Inventors
- 👤 Michel Baguena
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:34
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/02; F01L1/04; F01L1/08; F01L1/044; F01L1/10; F01L1/12; F01L1/18; F01L1/181; F01L1/185; F01L1/30; F01L13/00; F01L13/0015; F01L13/0021; F01L13/0036; F01L13/0047; F01L13/0063; F01L2013/0068; F01L2305/00; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
335 words
Valve control mechanism for an internal combustion engine, for varying the lift of at least one valve of said engine, and comprising a kinematic chain including: main cam means having one driving cam rotating around a first rotation axis which is a fixed axis, for producing an invariable alternating primary movement; secondary cam means, consisting of a rocking cam to which said invariable alternating primary movement is transmitted so that said rocking cam produces a valve lift secondary movement for lifting said valve against the action of a return spring, with the help of at least one valve actuating member; roller means interposed between and in contact with said valve actuating member and a profile of said rocking cam for transmitting to said valve actuating member said valve lift secondary movement that said roller means receives from said rocking cam; and, control means allowing to cause a relative displacement between said roller means and said rocking cam for making use of a portion of said rocking cam profile, wherein, said rocking cam is a cam oscillating around a second rotation axis and having at least one contact member in contact with said driving cam for transmitting said invariable alternating primary movement from said driving cam to said rocking cam, said roller means comprises a roller mounted on a roller axis and which contacts said rocking cam with said roller and said valve actuating member with said roller axis so that said roller receives said valve lift secondary movement from said rocking cam whereas said roller axis communicates said valve lift secondary movement to said valve actuating member; and, said control means includes support arms which are adjustably fastened about said second rotation axis and present guide grooves in which said roller axis is engaged and guided by its two ends, for changing the relative position between said roller and said rocking cam and thus the valve lift by changing the position of said support arms and thus of said roller around said second rotation axis.
Claim 2
Dependent Claim
335 words
Valve control mechanism for an internal combustion engine, for varying the lift of at least one valve of said engine, and comprising a kinematic chain including: main cam means having one driving cam rotating around a first rotation axis which is a fixed axis, for producing an invariable alternating primary movement; secondary cam means, consisting of a rocking cam to which said invariable alternating primary movement is transmitted so that said rocking cam produces a valve lift secondary movement for lifting said valve against the action of a return spring, with the help of at least one valve actuating member; roller means interposed between and in contact with said valve actuating member and a profile of said rocking cam for transmitting to said valve actuating member said valve lift secondary movement that said roller means receives from said rocking cam; and, control means allowing to cause a relative displacement between said roller means and said rocking cam for making use of a portion of said rocking cam profile, wherein, said rocking cam is a cam oscillating around a second rotation axis and having at least one contact member in contact with said driving cam for transmitting said invariable alternating primary movement from said driving cam to said rocking cam, said roller means comprises a roller mounted on a roller axis and which contacts said rocking cam with said roller and said valve actuating member with said roller axis so that said roller receives said valve lift secondary movement from said rocking cam whereas said roller axis communicates said valve lift secondary movement to said valve actuating member; and, said control means includes support arms which are adjustably fastened about said second rotation axis and present guide grooves in which said roller axis is engaged and guided by its two ends, for changing the relative position between said roller and said rocking cam and thus the valve lift by changing the position of said support arms and thus of said roller around said second rotation axis.
Claim 3
Dependent Claim
83 words
Valve control mechanism as in claim 1, wherein said main cam means is in the form of a bilateral linkage consisting in said driving cam rocking said rocking cam in one direction around said second rotation axis, and in a return-cam rotating with said driving cam around said first rotation axis and rocking said rocking cam in the opposite direction around said second rotation axis through at least one contact member of said rocking cam with which said return cam is in contact.
Claim 4
Dependent Claim
42 words
Valve control mechanism as in claim 1, wherein said changing of the relative position between said roller and said rocking cam is obtained by positioning said guide grooves in a direction extending parallel to a neutral portion of said rocking cam profile.
Claim 5
Dependent Claim
44 words
Valve control mechanism as in claim 3, wherein said roller axis is in contact, while said valve is closing, with a portion of said valve actuating member having a part circular profile which is concentric with said neutral portion of said rocking cam profile.
Claim 6
Dependent Claim
53 words
Valve control mechanism as in claim 1, wherein said roller axis comprises, at each of its two ends, two parallel flat surfaces engaging the corresponding guide groove which is rectilinear and extends substantially radially with respect to said second rotation axis for laterally maintaining said roller axis with respect to said control means.
Claim 7
Dependent Claim
21 words
Valve control mechanism as in claim 1, wherein said valve actuating member has a U-shaped profile which laterally maintains said roller.
Claim 8
Dependent Claim
46 words
Valve control mechanism as in claim 1, wherein said valve actuating member is in contact with said roller axis along a zone of contact of the latter which has a radius of curvature greater than that of said roller axis outside of said zone of contact.
Claim 9
Dependent Claim
125 words
Valve control mechanism as in claim 1, wherein said roller axis is equipped with an anti-wear shoe having a central portion and two ends portions, said anti-wear shoe presenting, in its central portion, a clearance allowing said roller to pass so that said roller maintains said shoe in a lateral position, and said anti-wear shoe comprising at either of its end portions two bearing surfaces in the shape of arcs, one for engaging a corresponding groove formed in said roller axis for receiving the corresponding shoe end portion, and the other for engaging said valve actuating member so that during valve lift two rotations take place simultaneously around said bearing surfaces, one in said roller axis groove and the other on said valve actuating member.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-24 | 1989-08-26 | 1990-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-24 | 1993-08-26 | 1994-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-24 | 1997-08-26 | 1998-02-25 | $7700.00 | Window Closed / Lapsed |