Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1996-09-27
1999-08-03
Lo, Weilun
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 9048, F01L 902, F01L 1300
Patent
active
059311258
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a system and method that provides the capability to a valve lifter of a piston internal combustion engine (I.C.E.) to act in a variable way on the respective valve, as well as the variation of its timing in general, namely the variation of the valve opening time moment, as well as the variation of the valve opening-valve closing time duration. This variation is executed gradually. With reference to similar valves of the same internal combustion engine cylinder, the gradual variation of the characteristics of one valve to follow at a predetermined time lapse the gradual variation of the characteristics of another valve with the purpose of improving the internal combustion engine performance in the medium and lower operation RPM range.
2. Brief Description of the Background of the Invention Including Prior Art
It is well known that a conventional, presently in use valve lifter, mechanically or hydraulically adjusted, is constantly in contact with the respective cam of a rotating camshaft of an internal combustion engine, and transmits the motion for the opening or closing of the respective valve in a stable manner, with the help of the valve spring.
A further control of the valve motion is achieved according to U.S. Pat. No. 4,765,268 and U.S. Pat. No. 4,689,084 through a valve mechanism, which have the basic idea of controlling the pressure of a hydraulic means securely with the respective valve, wherein the hydraulic means is able to penetrate and come out of a chamber, which chamber is disposed between the respective cam of the internal combustion engine cam-shaft and the upper end of a movable small piston.
The known system requires an electromagnetic valve through which the control of the hydraulic means is achieved and a reservoir for the returning hydraulic means. This reservoir is located outside the electromagnetic valve or is part of the electromagnetic valve construction. A consequence of the above mentioned mechanism is the possibility of changing the operational characteristics of an internal combustion engine valve.
In spite of that, the above mentioned mechanism, has the disadvantage of requiring increased space between the valve end of the respective internal combustion engine cylinder and the corresponding cam, resulting in the need for a new cylinder head design and the increase in production cost.
Another disadvantage is also the fact that the complicated mechanism in conjunction with the mass of its components is creating obviously inertia problems during the engine operation. Finally, the manufacturing cost of the mechanism multiplied by the number of the valves is considerably increasing the production cost of a motor.
SUMMARY OF THE INVENTION
The object of the present invention is to provide for a simple system for increasing and decreasing the pressure of a fluid in a chamber enclosed inside a mechanically or hydraulically adjusted valve lifter already in use in most motor models, manufactured by various companies today, so that no additional cylinder head space is required between the cam and the respective valve lifter that would have resulted in the need for a now cylinder head design.
It is a further object of the present invention to provide for a system which can operate with the variation of the pressure of the oil supplied for internal combustion engine lubrication.
It is still a further object of the present invention to provide for a system which prevents any inertia problem during the operation of the engine and to keep the manufacturing cost similar to the cost of a hydraulic type valve lifter.
These and other objects and advantages of the present invention will be come evident from the description which follows,
The piston internal combustion engine variable action valve lifter system according to the present invention offers an improvement in the efficiency and the torque distribution of the internal combustion engine in the medium and lower operation RPX range, with the gradual reduction
REFERENCES:
patent: 4164917 (1979-08-01), Glasson
patent: 4491098 (1985-01-01), Rotondo
patent: 4765288 (1988-08-01), Linder et al.
patent: 5113811 (1992-05-01), Rembold et al.
patent: 5154143 (1992-10-01), Stutzenberger
patent: 5163389 (1992-11-01), Fujikawa et al.
patent: 5193496 (1993-03-01), Kruger
patent: 5255639 (1993-10-01), Shirey et al.
patent: 5555861 (1996-09-01), Mayr et al.
Kasper Horst M.
Lo Weilun
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