Internal-combustion engines – Four-cycle – Rotating valve
Patent
1987-02-05
1988-10-11
Bennett, Henry A.
Internal-combustion engines
Four-cycle
Rotating valve
123190A, F01L 700
Patent
active
047763060
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a valve operating system for an internal combustion engine and more particularly, to a valve operating system for an internal combustion engine, which uses a spherical rotary valve.
TECHNICAL SUBJECT
A poppet valve used in a valve operating system of a usual internal combustion engine is currently employed in most of internal combustion engines because of its good sealing property. When an improvement in performance of the internal combustion engine is intended to be provided, however, the use of the poppet valve is accompanied by the various disadvantages: A hot exhaust valve exposes its appearance into a combustion chamber to promote the generation of a detonation and a preignition; the presence of a valve stem and a valve head in a passage results in a resistance to the passing of a gas to cause a degradation in intake and exhaust efficiencies; because the poppet valve has the valve stem and the valve head, intake and exhaust passages are curved in the vicinity of the valve, resulting in a degradation in intake and exhaust efficiencies; because the valve is reciprocally moved by the valve stem, a space elongated in the direction of such reciprocal movement is required, resulting in a large-sized engine; and because the opening and closing of the valve are conducted by the reciprocal movement of the valve stem, a shock noise is generated during closing of the valve.
To overcome the disadvantages found in the use of the poppet valve, a large number of sleeve valves and rotary valves have been proposed and particularly, studies have been made for rotary valves such as spherical, cylindrical, conical and disk-shaped valves.
However, all of rotary valve systems which have been hithereto proposed are of an arrangement such that to avoid a reciprocal movement, a rotational movement is continuously imparted, whereby even during explosion, a valve body is rotated while being subjected to an explosion force. For this reason, it is impossible to overcome an increasement in friction and the incompleteness of sealing. In addition, because the valve body continues to rotate even during intaking and exhausting operations due to the structure of the rotary valve system, an effective opening time cannot be precisely provided, and to provide such an effective opening time precisely, it is necessary to ensure a more precise timing in opening of a valve bore and to increase the opened area of the valve bore. With the variation in configuration of the valve opening being given in this way, an opening loss may be produced in intake and exhaust ports to degrade the intake and exhaust efficiencies. The above problems retard the putting of such rotary valve systems to practical use.
DISCLOSURE OF THE INVENTION
The present invention has been accomplished with the foregoing in view and aims at providing an increasement in opened area per unit time during opening of a valve, an improvement in sealing property during explosion and a reduction in friction, as well as a compact construction of engine and an improvement in performance of assembling a valve operating mechanism or the like by holding a valve body of, particularly, a spherical rotary valve in a stational (stopped) state during opening of the valve and during a specific stroke of an engine such as an explosion stroke.
To accomplish the above object, according to the present invention, there is provided a valve operating system for an internal combustion engine, which comprises intake and exhaust rotary valves respectively disposed in intake and exhaust passages communicating with a combustion chamber in an internal combustion engine, the valves including spherical valve bodies adapted to open and close said intake and exhaust passages, respectively, and a valve operating mechanism having an intermittent operating function of rotatively driving the valve bodies of the intake and exhaust rotary valves interlockingly with the movement of a piston in the internal combustion engine to provide the opening and closing contr
REFERENCES:
patent: 1104075 (1914-07-01), Shaw
patent: 2411321 (1946-11-01), Hall
patent: 3526612 (1970-09-01), Henvaux
patent: 3730161 (1973-05-01), Deane
Kuroki Masahiro
Matsuura Masaaki
Nakamori Masaharu
Bennett Henry A.
Honda Giken Kogyo Kabushiki Kaisha
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