CN201007242Y - Motorcycle engine pistons for spherical combustion chambers - Google Patents

Abstract

The utility model discloses a motorcycle engine piston used in a spherical combustion chamber. The center of the top surface of the piston is a spherical protruding surface. The spherical protruding surface is provided with three intersecting concave curved surfaces. The first concave The space formed by the curved surface is the intake valve collision avoidance pit, the space formed by the second concave curved surface is the exhaust valve collision avoidance pit, the third concave curved surface is a spherical concave surface, and the space formed between the spherical concave surface and the engine cylinder head It is a spherical combustion chamber; the central spherical protruding surface of the top surface of the piston is intersected by three concave curved surfaces to form a spherical boss squeeze surface. The piston of the utility model can form a new type of spherical combustion chamber with the cylinder head with spherical pits, and the spherical combustion chamber can well strengthen the air flow disturbance of the mixed gas near the spark plug, accelerate flame propagation, improve combustion, and reduce emission. The piston of the utility model is the basis for realizing the above-mentioned spherical combustion chamber.

Description

Motorcycle engine pistons for spherical combustion chambers

technical field

The utility model relates to a motorcycle engine, in particular to a structure of a piston part of the motorcycle engine.

Background technique

The piston is a key part of the engine that reciprocates at high speed in the cylinder liner of the engine. The ordinary piston is generally flat-topped, and the combustion chamber formed between it and the cylinder head is usually a relatively regular space similar to the shape of a bell. This combustion chamber is due to The shape of the piston is simple, and it is not easy to cooperate well with the wall of the cylinder head (that is, the spherical combustion chamber on the cylinder head), forming a vortex motion that is beneficial to the better combustion of the mixture, and the spherical combustion chamber can well strengthen the mixture near the spark plug. The advantages of airflow turbulence, accelerated flame propagation, improved combustion, and reduced emissions. Therefore, to adapt the piston to the spherical combustion chamber, it is necessary to change the geometry and structure of the piston top in the prior art.

Utility model content

The utility model aims to solve the technical problem that the piston of the motorcycle engine in the prior art should adapt to a spherical combustion chamber, and provides a motorcycle engine piston used in a spherical combustion chamber, which can be formed with a cylinder head with a spherical pit A spherical combustion chamber.

The technical solution of the utility model for motorcycle engine pistons with spherical combustion chambers is as follows: the center of the top surface of the piston is a spherical protruding surface, and the spherical protruding surface is provided with three intersecting concave curved surfaces. The space formed by the curved curved surface is the intake valve collision avoidance pit, the space formed by the second concave curved surface is the exhaust valve collision avoidance pit, the third concave curved surface is a spherical concave surface, and the space formed between the spherical concave surface and the engine cylinder head The space is a spherical combustion chamber; the central spherical protruding surface of the top surface of the piston is intersected by three concave curved surfaces to form a spherical boss squeezing surface.

Compared with the prior art, the beneficial effect of the utility model is that the piston of the utility model can form a new type of spherical combustion chamber with the cylinder head with spherical pits, and the spherical combustion chamber can well strengthen the spark plug. Airflow turbulence of the nearby mixture accelerates flame spread, improves combustion and reduces emissions. The piston of the utility model is the basis for realizing the above-mentioned spherical combustion chamber.

Description of drawings

Fig. 1 is the top view of the utility model motorcycle engine piston;

Fig. 2 is the perspective view of the utility model motorcycle engine piston;

Fig. 3 is the sectional view of A-A cutting position shown in Fig. 1;

Fig. 4 is the cross-sectional view of B-B cutting position shown in Fig. 1;

Fig. 5 is the cross-sectional view of C-C cutting position shown in Fig. 1;

Fig. 6 is a schematic diagram of the working position of the motorcycle engine piston of the utility model.

The following is an explanation of the reference signs of the main parts in the drawings of the specification:

1—Intake valve collision avoidance pit 2—Piston top plane 3—Exhaust valve collision avoidance pit

4——Spherical boss 5——Spherical pit 6——Cylinder head

7——Cooling water chamber 8——Spark plug 9——Piston

10——squeeze vortex 11——spherical protruding surface

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

As shown in Figures 1 to 5, the edge of the piston top surface of the motorcycle engine piston used in the spherical combustion chamber of the present invention is the piston top plane 2, and the center of the piston top surface is a spherical protruding surface 11, and the spherical protruding surface 11 is provided with three Two intersecting concave curved surfaces, the space formed by the first concave curved surface is the intake valve collision avoidance pit 1, and the spherical space formed by the second concave curved surface is the exhaust valve collision avoidance pit 3; as the name implies, the intake valve The effect of the collision avoidance pit 1 is exactly to prevent the top surface of the piston 9 from colliding with the intake valve on the cylinder head 6 when the piston 9 is used in conjunction with the cylinder head 6; This is similar. Described the 3rd concave curved surface is spherical concave surface, and the space of the spherical dimple 5 that forms between described spherical concave surface and engine cylinder head 6 is the spherical combustion chamber of engine, that is: as shown in Figure 6, described spherical concave surface The formed spherical dimple 5 is part of the spherical combustion chamber on the piston 9 . After the piston 9 and the cylinder head 6 are installed together, the spherical dimple 5 on the top surface of the piston 9 and the cylinder head 6, cylinder block, etc. around it form a small spherical space, which is conducive to forming a spark plug near the spark plug 8 that can improve combustion. The micro-vortex; it first forms the core of the flame, and then spreads to the surroundings, which is beneficial to reduce the NOx emission of the engine while reducing the HC emission. The central spherical protruding surface 11 of the top surface of the piston is intersected by three concave curved surfaces to form the extrusion surface of the spherical boss 4 . That is: the spherical boss cooperates with another part of the spherical combustion chamber on the cylinder head, thereby forming a squish vortex beneficial to improving combustion and emission.

Utilize the action principle of the novel spherical combustion chamber composed of the piston 9 and the cylinder head 6 of the present invention as shown in Figure 6, in the intake stroke, the fresh air enters the cylinder from the intake opening under the negative pressure of the downward movement of the piston 9 , and the combustible mixture entering the cylinder is in the compression stroke; when the piston 9 moves upward, a strong squeeze vortex 10 is formed under the joint action of the piston spherical boss 4 and the cylinder head 6 combustion chamber. These airflow disturbances rotate and gather under the guide flow of the spherical pit 5 on the top surface of the piston. Since the spherical pit 5 on the top of the piston can be wrapped with the surrounding cylinder head 6 etc. into a small spherical space closest to the discharge electrode of the spark plug 8, therefore, The turbulence of these gathered mixed gases is easy to form a micro-vortex near the spark plug 8, which is conducive to the formation of the fire nucleus. The combustion chamber can greatly increase the flame propagation rate and improve combustion. Since the strong wall gas flow takes away a large amount of HC attached to the wall of the combustion chamber, the HC emission of the engine will also be greatly reduced.

At the same time, since the small spherical space formed by the spherical pit 5 on the top of the piston and the surrounding cylinder head, etc. is the closest to the ignition core of the spark plug, the combustion flame is first generated here, and then propagates to the In other spaces in the cylinder, the form of its combustion and flame propagation is similar to a separate combustion chamber such as a vortex chamber type combustion chamber, which can appropriately reduce the explosion pressure and reduce the combustion temperature, so the combustion chamber formed by the piston of the present invention is also beneficial Reduce engine NOx emissions. In addition, as shown in Figure 6, a cooling water cavity 7 matching the spherical combustion chamber is provided outside the combustion chamber to meet the cooling effect of the large gas charge of the spherical combustion chamber, thereby reducing heat load and improving combustion efficiency.

To sum up, the piston of the utility model can effectively reduce engine emission while improving combustion.

Although the preferred embodiment of the utility model has been described above in conjunction with the accompanying drawings, the utility model is not limited to the above-mentioned specific implementation, and the above-mentioned specific implementation is only illustrative, rather than restrictive, and those skilled in the art Under the enlightenment of the utility model, those of ordinary skill can also make many forms without departing from the purpose of the utility model and the scope protected by the claims, and these all belong to the protection of the utility model.

Claims (1)

1. motorcycle engine piston that is used for spherical combustion chamber, comprise piston-top surface, it is characterized in that: described piston-top surface central authorities protrusion surface spherical in shape, described shape ball protrusion surface is provided with three and cuts the concave curvatures of handing over, the space that first concave curvatures forms is intake valve collision prevention hole, the space that second concave curvatures forms is exhaust valve collision prevention hole, and the 3rd concave curvatures is spherical concave surface, and the space that forms between described spherical concave surface and the engine cylinder cap is a spherical combustion chamber; What described piston-top surface central ball protrusion surface formed after three concave curvatures are cut friendship is spherical boss squish face.

Images