WO1991010815A1

WO1991010815A1 - Valve for four-cycle engine

Info

Publication number: WO1991010815A1
Application number: PCT/JP1991/000026
Authority: WO
Inventors: Shigeru Chishiro
Original assignee: Shigeru Chishiro
Priority date: 1990-01-17
Filing date: 1991-01-16
Publication date: 1991-07-25
Also published as: JPH03253709A

Abstract

An S.C valve for a four-cycle engine, formed of a light titanium material or a metallic alloy and iron material, and used in combination of circular main and auxiliary valves. These valves respectively have two holes (2A and 2a) on the diagonal lines thereof and function as an intake valve and an exhaust valve. A shaft provided in the central portion of these circular valves and a mechanism for rotating these valves is attached to the top of the shaft, which mechanism is driven by a rotary cam, a belt and the like and powered by the crankshaft. The main and auxiliary valves thus superposed on each other are separately controlled and rotated, so that four strokes including intake, explosion, compression and exhaust can be carried out, thus providing high-speed rotation and high output.

Description

Specification

4 Valves for Cital Engine

Technical field

This invention performs two stages of suction, compression, explosion, and exhaust by two round valves for a four-stroke engine. · Suitable for high-speed and high-power engines, mainly alloys of titanium and metal And valves for engines made of iron. Background art

Conventional four-stroke engines rotate by precisely performing four strokes: intake, thickening, explosion, and exhaust. The types of engines that perform important intake and exhaust strokes are broadly divided into OHV, OHC, and DOHC. The D0HC engine used in recent cars, etc. drives two intake valves and two exhaust valves in total by using two camshafts to move up and down to perform accurate intake and exhaust. It is a vertically long valve-type engine. In this type of valve drive, the higher the speed, the more the valve and the valve spring will cause a valve jump, resulting in poor adhesion to the camshaft and inaccurate valve movement. This inaccurate valve movement limits rotation at high speeds. In the past, in order to solve such disadvantages, the size and weight of the valve itself were reduced to improve the followability of the camshaft and to suppress the valve jump. In addition, swaying was suppressed and resistance was reduced by strengthening the valve spring, making it smaller and lighter. Furthermore, the swing was suppressed by changing the camshaft's lift shape, etc., and a D0HC engine for high rotation and high output has been developed until now. Accordingly, the present invention provides an S, C valve for a four-cycle engine (hereinafter referred to as a four-cycle engine) capable of completely eliminating the swing caused by the valve jump of the valve generated in the conventional engine, increasing the rotation speed, and enabling high output. Is referred to as a valve). Disclosure of the invention

In the present invention, the valves are used in the form of connected perfect circles, two holes are formed diagonally, and the two main and sub-valves overlap and rotate. As a result, the intake efficiency and exhaust efficiency are improved with extremely low resistance, and the possibility of valve jumps caused by the up and down movement of the conventional valve is eliminated. The two overlapping valves are separately controlled to accurately inhale and exhaust. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a diagram showing a three-dimensional view of a preferred main and sub-valves according to the present invention, and FIG. 2 is a side view showing the whole with a valve mounted on an engine for easy understanding. Fig. 3 shows the valve mounted on the engine and a top view for easy understanding. FIG. 4 shows a plan view of the rotary cam for controlling the auxiliary valve for easy understanding. BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be described in more detail with reference to the accompanying drawings.

In Fig. 1, the interval between the main valve and the sub-valve is increased and decreased for easier understanding. The main valve 1, which is a perfect circular disk, has a thickness of about 2 mm or more, and has two holes 2A diagonally open to serve as inlet and outlet ports. The pipe 3 at the center of the circle serves as a fulcrum, and the main valve 1 can rotate in a certain direction. A belt gear 14 is used as the upper gear to be driven, and the main valve is rotated by a toothed belt. Similarly, the secondary valve 2 has a thickness of about 2 mm or more, and is the same circular disk as the main valve. Drill holes 2a of almost the same shape in two places, and use them for the inlet and outlet. The hole of ignition port 2b is drilled in other parts. Shaft 3a that is 轴 in the center of the circle The upper part has an arm 4a for rotating the auxiliary valve, and the end has a joint 4b. The rotating secondary valve rotates irregularly with a step difference in a certain direction. The secondary valve shaft 3a enters the main valve pipe 3 and is assembled and used. Both overlapping valves have low resistance because the central shaft and pipe are supported by the bearing 3b, and the two valves can rotate freely, reducing the resistance and reducing the rotational speed. Can be speeded up. For materials of the main valve and sub-valve, use titanium-based materials, metal-based alloy materials, and other iron materials when it is necessary to reduce the weight such as lacing.

Fig. 2 illustrates the operating principle with a side view of the whole, with the valve mounted on the engine and easy to understand.

The main valve and the sub-valve are installed on the same line as the center of the piston 10 and on the line, and further above the upper combustion chamber. The valve is spaced at least 2 mm above the combustion chamber, and the combustion chamber and the valve are in contact with four holes opened in the combustion chamber. The four holes of the combustion chamber, the four holes of the main valve and the sub-valve, and the four holes of the intake port and the exhaust port are opened and closed by the main and sub-valves. Inhaled air is sucked through two diagonal holes in the combustion chamber, and exhaust gas is exhausted from two diagonal holes in the combustion chamber. The overall structure for opening and closing the holes in the main and sub-valves that act as valves will be described.

In order to control the rotation of the main valve, the gears 9a of the crank shaft 9 and the gear ratio of the gear 8 take the power reduced by a ratio of 1: 2, and the outer periphery of the left side of the gear 8 is reduced to half the rotation speed. Rotate the gear 7b with the tooth 8b attached to. The belt gear 7 above the main valve is rotated one-to-one by the belt gear 7a with a toothed belt 7a. Instead of the belt gear 4, the belt gear 7, and the toothed belt 7a, a sprocket and a chain may be used. This is because sprockets and chains are suitable for racing engines, etc., and toothed belts and gears are suitable for commercial vehicles and other engines. It is.

In order to control the rotation of the auxiliary valve, the crankshaft gear 9a and the gear 8 are reduced at a gear ratio of 1: 2, and the belt gear 8a on the right side of the gear 8 that has increased to half the rotational speed is used. The belt 5c with teeth is driven, and the belt gear 5b of the upper rotating cam 5 is rotated one to one. The peaks and valleys of the cam surface 5a of the rotary cam drive the rod 6 to move it back and forth. The rod is always pressed against the cam surface by the spring 6a and is in close contact. The tip of the rod is connected by the joint 4b of the arm 4a to rotate the auxiliary valve. In this way, the main and sub-valves are reduced in half by one revolution of the crankshaft, and when the crankshaft makes two revolutions, both valves make one revolution at different speeds.

Fig. 3 explains the valve mounted on the engine when viewed from the top, but we would like to see it together with Fig. 1 to supplement. At the time of inhalation, the sub-valve below first rotates to the suction port 2c, and the main valve above it rotates afterwards. From the suction port, the suction air is gradually drawn into the cylinder through the holes 2A and 2a of the main and sub-valves. After inhalation, the holes of both valves close and the inhalation ends. During compression and explosion, both valve holes remain completely closed. During exhaust, the sub-valve rotates to the exhaust port 2d, which exhausts first, and the main valve rotates afterwards. A hole is gradually opened and exhaust is performed through the exhaust port. Thus, the intake and exhaust strokes take place only when the primary and secondary valves have holes ^; During compression and explosion, both holes are closed and the valve is airtight.

For easy understanding, the rotation angle is described for each step and will be described in detail. At the end of the suction stroke, with each hole of the main and sub-valves fully opened, make a left turn of 360 ° starting from each point A.

In the compression stroke, the sub-valve rotates 90 ° first, closing the valve hole completely. With the valve holes all closed, turn the main valve 90 ° to the left and rotate the secondary valve to 180 °. In front of the upper starting point, ignition Fired from mouth. During the explosion stroke, the secondary valve rotates to 270 ° and the main valve rotates to 180 ° until both valve holes are completely closed. In the exhaust stroke, only the main valve rotates to 270 ° while the sub valve is stopped at 270 °, and exhaust is performed from the exhaust port 2d. In the suction stroke, the sub-valve is rotated to 360 ° first, and the main valve to be rotated later starts suction from the suction port at about 290 ° through the hole 2A into the combustion chamber. Stop inhalation at 360 °. By rotating the two valves in a certain direction in these four strokes, accurate control is performed, and the valves act between the combustion chamber and the ports to open and close, thereby increasing the engine speed. Things. The intake port 2c has two diagonal lines, and the exhaust port 2d has two diagonal lines.The intake and exhaust are performed at a total of four locations, which is equivalent to four valves of the conventional type. Shape and overall area can be made wider than conventional valves, so high intake and exhaust efficiency and high output can be obtained. In addition, the intake and exhaust from the left and right are balanced, crossing diagonally from the center of the combustion chamber. In addition, the racing engine seems to be capable of an estimated 200,000 rpm because the valve only rotates. One spark plug 10b is shown in the drawing, but it is possible to place two spark plugs locally. The rod 6 which is moved back and forth by the rotating cam 5 bends from the middle of the road and performs a crank movement. Fig. 4 is a plan view of the cam surface 5a on which the circular rotary cam 5 has a diaper, which is important for controlling the rotation of the sub-valve as shown in Fig. 3, for easy understanding. I have. The arm position of the sub-valve starts at rod direction B, rotating cam direction C, and starting point D as point A in Fig. 3, a indicates that the rod is pressed quickly during the suction stroke, and a 'indicates the stopped state. You. b indicates that the mouth is pulled quickly in the compression stroke, and b 'indicates that the mouth is pulled slowly. c indicates the explosion stroke, pushing the mouth gently. d indicates the exhaust stroke and the rod is stopped. Also, return to starting point D. Such a process is repeated by rotating. or, By increasing the straightness of the rotating cam, it is possible to control the rod with a fine and smooth cam surface. Industrial applicability

As described above, the valve of the present invention is particularly suitable for use in high-power and high-horsepower engines as a valve used in automobiles, motorcycles, ships, and other engines.

Claims

The scope of the claims

A valve that is a perfect circular disk is combined by a main valve (1) and a sub-valve (2) to make one set of two. Drill two large holes (2A) and two holes (2a) diagonally from the center of both valves and use both holes for the inlet and outlet. The secondary valve is further provided with a small spark hole (2b). The shaft is combined with a shaft and pipe to rotate the valve at the center, and is driven by the upper gear, sprocket, and arm. This is a valve for a four-stroke engine, characterized by rotating two overlapping valves separately and opening and closing four holes in the two valves to perform intake and exhaust.