JPS6329005A - Ceramic rotary engine valve - Google Patents

Abstract

PURPOSE:To improve the durability and reliability of a valve by making a rotary body to make relative rotation with respect to a fixed body forming a cylinder head, following the reciprocating motion of a piston and thereby making an intake port and an exhaust port equipped in both bodies communicate each other selectively. CONSTITUTION:An engine valve 10 is composed of a fixed body 20 and a rotary body 30 equipped in it in a free rotational manner. The fixed body 20 is formed as a cylinder head having an upside-down bowl configulation using ceramic, and equipped with an intake port 22, an exhaust port 23, and other parts. On the one hand, the rotary body 30 is formed by being made of ceramic and equipped with a circular adjusting base 32 and a supporting shaft 34 fixed at the center of the adjusting base 32, and the adjusting base 32 is provided with an intake elliptical hole 36 and an exhaust elliptical hole 38. Also the supporting shaft 34 is inserted into a supporting shaft hole 24 made in the fixed body 20, and the adjusting base 32 is made to rotate through the supporting shaft 34 with the reciprocating motion of a piston 12. This enables the rotation of the rotary body 30 relative to the fixed body 20, and the selective communication of the intake elliptical hole 36 and the exhaust elliptical hole 38 to the intake hole 22 and the exhaust hole 23.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an engine valve for a reciprocating engine, and in particular, to an engine valve for a reciprocating engine. This relates to a ceramic rotary engine valve that performs the following functions.

<Prior Art> Currently, many automobile engines are reciprocating engines in which a piston reciprocates within a cylinder. In a reciprocating engine, the engine intake and exhaust valves open and close in conjunction with the reciprocating movement of the piston.
It takes in, compresses, explodes, and exhausts air-fuel mixture and combustion gas to generate power. That is, engine intake and exhaust valves are important parts of an automobile engine and have a complicated structure. In addition, the engine intake and exhaust valves open at 2 times per minute.
Valve seats become deformed and worn out because they are opened and closed over 1,000 times and exposed to high temperature and high pressure gas.

Additionally, the valve faces were burnt out, causing gas leaks, resulting in reduced output and wasted fuel and oil. Therefore, strict conditions are required in selecting the material and shape of the valve, and high-grade materials with excellent heat resistance are currently used.

Therefore, a simpler structure and lower cost engine suction
Development of an exhaust valve is desired.

<Problems to be Solved by the Invention> An object of the present invention is to provide a ceramic rotary engine valve that has a simple structure and is capable of sucking in air-fuel mixture and exhausting combustion gas. In this invention, a rotary ceramic body having an adjustment slot for adjusting the opening/closing time of the intake/exhaust holes is rotatably attached to a fixed ceramic body having intake/exhaust holes. By rotating a two-rotary body in conjunction with the reciprocating motion of a piston to suck in air-fuel mixture and exhaust combustion gas, we provide a ceramic rotary engine valve with fewer parts, low cost, and less engine noise. It is intended to.

A ceramic rotary engine valve according to the present invention includes a fixed body made of ceramic having an intake hole and an exhaust hole, and a fixed body rotatably mounted on the fixed body. and a rotating body made of a ceramic material through which an intake long hole and an exhaust long hole overlap the exhaust hole, and the rotating body slides and rotates on the surface of the stationary body.

It is configured to open and close the intake and exhaust holes.

<Function> Regarding the function of the ceramic rotary engine valve according to the present invention, the movement of the intake hole/exhaust hole and the intake long hole/exhaust hole will be explained based on FIG.

FIG. 2 is a state diagram looking up at the rotating body from inside the cylinder. When the piston begins to descend from the highest point (top dead center), the rotating body 30 rotates, and only the intake hole 22 of the stationary body 20 and the long intake hole 36 of the rotating body overlap (as shown by the solid line in Fig. 2). The holes indicated by the dotted line indicate the open state, and the holes indicated by the broken line indicate the closed state), and the mixture of fuel and air enters the cylinder through the intake hole 22 (intake stroke) (Fig. 2 (1) ), when the piston starts to rise from the lowest point (bottom dead center), the long intake hole 36 ends and the intake hole 22 closes (at this time, both the intake hole 22 and the exhaust hole 23 are closed). ).

The air-fuel mixture is compressed (compression stroke) (see Figure 2 (2))
.

At the end of compression, a spark is emitted by a spark plug to ignite the air-fuel mixture, causing it to explode, and the force of the high-pressure combustion gas pushes the piston down (expansion stroke) (see Figure 2 (3)). When the piston starts to rise again from the bottom dead center, the rotating body 30 rotates, the exhaust hole 23 and the exhaust elongated hole 38 overlap, and the combustion gas is pushed out from the exhaust hole 23 (exhaust stroke) (Fig. 2 (4)
reference).

Embodiments Hereinafter, a ceramic rotary engine valve according to the present invention will be described in detail based on embodiments shown in the drawings. Fig. 1 is a cross-sectional view showing a ceramic rotary engine valve according to the present invention, and Fig. 2 is a bottom view from inside showing how the first intake hole/exhaust hole overlaps with the intake long hole/exhaust long hole. be.

Ceramic rotary engine valve 10 according to this invention
is composed of a stationary body 20 and a rotating body 30, and the eight rotating bodies 30 are rotatably mounted on the stationary body 20.

The stationary body 20 is a bowl-shaped cylinder head made of ceramic, and has intake holes 22. Exhaust hole 23. Support shaft hole 2
4. Recessed portion 25. Plug insertion hole 27.28. Attachment holes 29 are each drilled or recessed.

Intake hole 22. The exhaust holes 23 are holes penetrating near the top of the cylinder head, and are bored on different circumferences around the top of the cylinder head. In this embodiment, the intake hole 22 is bored on the outer periphery of the exhaust hole 23, but the invention is not limited to this, and the intake hole 36 and the exhaust hole 38 are provided through an adjustment panel, which will be described later. Any positional relationship may be used as long as the air-fuel mixture and combustion gas can be taken in and exhausted in conjunction with the reciprocating motion of the piston.

The support shaft hole 24 is formed at the top of the cylinder head, and the support shaft 34 of the one-rotator 30 is inserted into the support shaft hole 24 .

The recess 25 is formed in the head portion of the inner wall of the cylinder head, and has approximately the same size as the thickness and width of the adjustment plate 32. As a result, when the eight-rotator 30 is fitted into the recess 25, the lower wall surface of the one-rotator 30 is flush with the inner wall surface of the cylinder head.

The plug insertion holes 27 and 28 are holes into which engine plugs are inserted, and are formed on the left and right sides of the cylinder head, respectively. In this example.

Although the plug insertion holes 27 and 28 are formed at two places on the side of the cylinder head, the invention is not limited to this, and the plug insertion holes 27 and 28 may be formed at one place on the side or in the center.

The mounting holes 29 are holes into which a mounting tool for fixing the stationary body 20, which is the cylinder head, to the cylinder body is inserted, and a plurality of mounting holes 29 are bored in the lower part of the cylinder head.

The rotating body 30 consists of a circular adjustment plate 32 made of ceramic and a support shaft 34, and the adjustment plate 32 has a long intake hole 36.
and an elongated exhaust hole 38 (see FIG. 2).

The support shaft 34 is fixed to the center of the adjustment board 32 and is fitted into the support shaft hole 24 of the stationary body 32.

In actual use, the support shaft 34 rotates in conjunction with the reciprocating motion of the piston, causing the adjustment plate 32 to slide and rotate.

The intake elongated hole 36 and the exhaust elongated hole 38 are circular arc-shaped holes, and are provided on different circumferences of the adjustment board 32 so as to overlap with the intake hole 22 and the exhaust hole 23 of the immovable body. In this embodiment, the intake elongated hole 36 is closer to the exhaust elongated hole 38,
The intake hole 22 and the exhaust hole 2 are provided on the outer periphery and are formed to extend through the hole, but are not limited to this.
3, the positional relationship and size may be such that the air-fuel mixture and combustion gas can be taken in and exhausted in conjunction with the reciprocating movement of the piston.

<Effects of the Invention> Since the ceramic intake/exhaust valve according to the present invention has the configuration described in detail above, the reciprocating motion of the piston is replaced with the vertical motion by the cam shaft as in the conventional case. It has the following effects (advantages) compared to the type that opens and closes. ■Ceramic has superior heat resistance and wear resistance compared to conventional metal materials, so it can suppress damage to valves caused by high heat and wear caused by sliding rotation. ■Since the rotating body is the only replacement part, the number of parts is reduced, and public costs can be kept low. ■It is possible to eliminate the contact noise between the intake/exhaust valves and the cam that conventionally occurred when the intake/exhaust valves moved up and down. ■Unlike conventional models, the intake and exhaust valves do not protrude beyond the cylinder head, making it possible to reduce the overall height of the cylinder head.

■Conventionally, the valve heads (umbrellas) of intake and exhaust valves were formed into approximately triangular pyramid shapes, and the air-fuel mixture and combustion gas did not directly flow into the intake/exhaust ports, but bypassed the hoods (umbrellas) of the valves. In contrast, the air-fuel mixture and combustion gas flow directly through the intake and exhaust holes, resulting in improved intake and exhaust efficiency. ■Conventionally, the restoring force of the valve spring was used to close the intake and exhaust valves.

The restoring force of the valve spring had a considerable effect on the engine speed, but since the valve spring is not required, the engine speed can be increased.

[Brief explanation of the drawing]

FIG. 4 is a cross-sectional view showing the ceramic rotary engine pulp according to the present invention, and FIG. 2 is a diagram showing how the intake holes/exhaust holes overlap with the intake holes/exhaust holes.

Claims (5)

[Claims] (1) A fixed body made of ceramic in which an intake hole and an exhaust hole are formed, and a long intake hole and a long exhaust hole that are rotatably attached to the fixed body and overlap with the intake hole and exhaust hole. Ceramic rotary engine valve characterized by comprising a rotating body with (2) A rotary engine valve made of ceramic, characterized in that the immovable body according to item 1 is a cylinder head in the shape of a bowl. (3) A ceramic intake/exhaust valve for an engine, characterized in that the intake hole and the exhaust hole according to item 1 above are formed on different circumferences around the top of the immovable body. (4) The rotating body according to the above item 1 is composed of a support shaft and a circular adjustment board through which an intake long hole and an exhaust long hole are formed, and the rotating body is connected to the immovable body via the support shaft. A ceramic rotary engine valve that is rotatably attached to the body. (5) A ceramic rotating device, characterized in that the intake long holes and exhaust long holes described in item 1 above are arc-shaped and extend through different circumferences of an adjustment board constituting the rotating body. engine valve