Internal-combustion engines – Accessories – Covers – trays – vibrators – corrosion inhibitors – air filters
Patent
1996-05-10
1998-11-10
Kamen, Noah P.
Internal-combustion engines
Accessories
Covers, trays, vibrators, corrosion inhibitors, air filters
123 9016, F02B 7700
Patent
active
058328912
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a valve gear mechanism for a multicylinder internal combustion engine. A valve gear mechanism such as this is known, for example, from EP 213 759 or DE 42 05 230.
SUMMARY OF THE INVENTION
The object of the invention is to employ simple means to develop improved cylinder disengagement. The object of the present invention for the sake of fuel conservation in a multicylinder internal combustion engine with a generic valve gear mechanism.
In the present invention, a particular cylinder is disengaged by shutting down its inlet valve or inlet valves. Cylinder disengagement is accomplished using a zero-pitch cam profile, a profile consisting exclusively of a base circle, on the first cams acting on the valves associated by way of the first rocker arms to the cylinder to be disengaged. Pressure means or cam lobes, therefore, do not act on the coupling pins, so that no coupling of these first rocker arms with the second rocker arm or arms takes place. Rocker arms normally interact with a cam having a profile which secures the desired valve control time and the desired valve lift.
The section of the longitudinal channel associated with the first rocker arm of the inlet valve of the cylinder to be disengaged may be sealed by plugs. One of such plugs may have a pressure oil delivery bore leading to the sealed section, which bore may be connected to a high-pressure source by means of an on-off valve actuatable on the basis of operating parameters. No pressure or only reduced pressure is present in the sealed channel section when the valve is closed, so that the first rocker arm, and with it the pertinent inlet valve, remain at rest. If the sealed channel section is supplied with high-pressure liquid by opening the on-off valve, the coupling pin moves into its coupling position, in which it connects the first rocker arm to the second rocker arm, thereby actuating the inlet valve as determined by the profile of the cam operating in conjunction with the second rocker arm. The plug with the pressure means delivery bore is mounted preferably in the area of a bearing point of the shaft in the cylinder head of the internal combustion engine, so that the on-off valve may be mounted on the bearing point.
If several inlet valves are provided for each cylinder, the camshaft for all inlet valves of at least one cylinder is provided with a first cam with zero-lift profile. A sealed section is provided in the longitudinal channel associated with these several inlet valves, one of which has a pressure means supply of its own. By the process described above therefore, no coupling occurs between the first and second rocker arms at zero pressure or reduced pressure and the inlet valves are shut off, while the first and second rocker arms are coupled when pressure is applied and the inlet valves are actuated as determined by the profile of the second cam or cams.
When several inlet valves per cylinder are installed for at least one cylinder and it is desired the camshaft. The first longitudinal channel is connected to the bores receiving the coupling pins in a first rocker arm actuating the first set of valves. The second longitudinal channel is connected to the bores receiving the coupling pins in the first set of rocker arms actuating a second set of inlet valves. Both longitudinal channels may have a sealable section for the inlet valves of at least one cylinder, and these sections may be connected to or isolated from a high-pressure source. In addition, these sections may be sealed at least at one end by a slide valve movable on the basis of operating parameters. In a first position the slide valve isolates both longitudinal channels from the high-pressure source, in which case all inlet valves of the subject cylinder are shut off. In a second position, the slide valve connects one of the longitudinal channels to the high-pressure source, in which case the valve or valves which are associated with this section of the longitudinal channel are actuated on the basis of the profile of t
REFERENCES:
patent: 5150675 (1992-09-01), Murata
Audi A.G.
Kamen Noah P.
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