JPS5946311A - Rotary valve system cylinder head - Google Patents

Abstract

PURPOSE:To simplify construction and enhance intake and exhaust efficiencies, by a rotary valve system cylinder head wherein a valve mechanism is changed from one for vertical motion to one for rotating motion. CONSTITUTION:In an intake stroke, only an intake valve 1 is opened, a piston is moved downward, and a fuel-air mixture is sucked in through the valve 1 by a negative pressure. In a compression stroke, both the intake valve 1 and an exhaust valve 2 are closed, and the piston is moved upward to compress the mixture. Then, in an expansion stroke, the mixture is ignited to explode by an ignition plug, and the piston is moved downward by the explosion pressure. In an exhaust stroke, only the exhaust valve 2 is opened, and the piston is moved upward to exhaust a combustion gas through the valve 2. Accordingly, cam shafts, valve springs and other component parts conventioally used to operate the valves are unrequired, the construction of the cylinder head can be simplified, and maintenance for valve clearrances or the like is unnecessitated. Since the number of component parts is small, weight and size can be reduced, so that cost can be reduced. In addition, since the openings (a), (b) of the combustion chamber can be formed in a rectangular shape, the intake and exhaust efficiencies are enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve mechanism for a four-stroke engine.

Conventionally, in a valve mechanism in which intake and exhaust are performed by upward movement of the valve by a camshaft, there is a mechanical loss due to the compression of the strong valve spring, a jerking phenomenon of the valve spring, and the resulting valve timing. The drawbacks were inaccuracy, noise due to increased valve clearance, complicated structure, and high cost.

Except for the above-mentioned drawbacks, the present invention has the structure lJ: ri
ti only small If li, beating [to increase energy efficiency,
An object of the present invention is to provide a rotary valve type cylinder head in which a valve machine I'Iη is changed from a -1-tort motion to a rotary motion.

In the following, the present invention will be explained based on the illustrated embodiments.

As shown in Fig. 1, the rotary valve type cylinder head of the present invention consists of rotary valves (1) and (2) with holes for intake and exhaust boats in the cylinder, and the rotary valves (]) and (2). ,
It consists of a cylinder head (3) directly exposed to the combustion chamber.

To be more specific, the cylindrical intake valve (1) is provided with an intake boat having holes equally formed on the left and right sides from the center.

The exhaust valve (2) is also provided with an exhaust port similar to the intake valve (1).

And the size of this boat is the same as the size where the valve is directly exposed to the combustion chamber.

Next, the cylinder head (3) is provided with intake and exhaust boats (c) and (d) of seven valve boats of the same size. The position of this boat is on the extension of the openings (a) and (b) where the valve is exposed to the combustion chamber and the position where the valve is fully open.

In other words, the valve boat is also the cylinder head boat (
C) and ni) also expose the valve to the combustion chamber (a) and (b)
It has the same size as the area of , and its position is on a straight line.

In addition, as shown in Fig. 2, this cylinder head has a hair ring (7) that supports the valve, a timing gear (8) that drives the valve, and a cooling gear A (not shown).
, - The valve and cylinder A', the nols to keep the seal 7' airtight, and the oil boat for lubrication are the next steps.

The rotary valve is turned by the rotation of the crankshaft.

As shown in Figure 3, the beginning of inspiration is A B' and 1)
, C', the intake air is started, and the engine is fully opened at about 4. The end of inspiration is B A' and CD as shown in Figure 4.
′ is the time when inspiration is complete. The same goes for Ul-qi.

Does a rotary valve rotate vertically for one cycle? 1 Now.

As shown in FIG. 6, the operating angle of the valve is determined by the ratio of the 1α radius of the valve to the size of the valve bow 1.

In order to improve intake and exhaust efficiency, when increasing the combustion chamber boat (a), it is necessary to increase the valve diameter, valve boat, and cylinder head boat (c).

This is because if the valve boat, combustion chamber boat (a), and cylinder head boat (c) are increased while the valve diameter remains unchanged, the valve operating angle will change.

If the combustion chamber boat on the exhaust side is made smaller than the combustion chamber boat on the intake side, the exhaust valve diameter will naturally become smaller than the intake valve diameter.

The valve operating angle can be calculated by multiplying the valve opening angle by 8.

7 to 10 are operational diagrams of a rotary valve type four-stroke reciprocating engine.

In FIG. 7, only the intake valve (1) opens and the piston descends, and the negative pressure at this time sucks the air-fuel mixture through the intake valve.

In Figure 8, both the intake valve (1) and the exhaust valve (2) are closed. The piston moves up by 1 and is compressed. In FIG. 9, an ignition explosion is caused by the spark plug, and the piston descends due to the explosion pressure.

In FIG. 10, only the exhaust valve (2) opens, the piston rises, and combustion gas is discharged from the exhaust valve.

Although the present invention is constructed as described above, parts such as camshafts, valve springs, and other rocker arms that operate the valves in the past are unnecessary. The cylinder head structure is simple, and maintenance such as valve clearance is not required. Furthermore, the number of parts in the cylinder head is small, making it light and compact, and the cost can be reduced.

Since the overall height of the engine can be lowered, there is greater freedom in car design and it is easier to build cars with excellent aerodynamic characteristics.

Rotary valves can achieve both the expansion of the area of the intake and exhaust boats and the reduction of inertial weight. Since the opening area of the combustion chamber can be made into a rectangular shape, it is larger than the currently best DOHC 4-valve engine, and the intake and exhaust efficiency is dramatically improved.

And, the problem of inertia and weight occupies a large part in downward movement valves, but since rotary valves perform rotational movement, this problem is negligible.

Therefore, the limit of high-speed rotation is dramatically improved.

In addition, since the open area changes instantaneously and the absorption and loss air is carried out straight without any resistance, the response is also very good.

As mentioned above, the rotary valve method is currently the best D
The filling efficiency is higher than the OHO4 valve, the rotation can be increased to high speed, and the structure is simple, so high output and high rotation are possible with less mechanical loss.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal view of the present invention, Fig. 2 is a plan view of the invention, Figs. 3 and 4 are operational diagrams of the intake valve from the beginning of intake to the intake passage, and Fig. 5 is a diagram of the rotary valve. Perspective view, Figure 6 is a diagram of the relationship between the rotary valve diameter and boat diameter, Figure 7 is the intake stroke, Figure 8 is the compression stroke, Figure 9 is the initial expansion stroke, and Figure 10 is the relationship between the rotary valve diameter and the boat diameter.
The figure is an exhaust stroke diagram. (]) [Air valve (2) Exhaust valve (3) Cylinder head (A) Combustion chamber intake boat (B) Combustion chamber exhaust boat (C) Cylinder head intake boat (D) Cylinder head exhaust boat (4) Cylinder block ( 5)
Combustion '% (6) Spark plug hole (7) Bearing (8
) Timing key left D Pulp diameter T Valve opening angle

Claims (1)

[Claims] A valve that performs intake and exhaust through rotational motion, and a cylinder head that makes up the valve.