JPS622136B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an internal combustion engine comprising a piston having an oval or oval cross section, a cylinder block having a cylinder hole into which the piston slides, and a cylinder head defining a combustion chamber above the piston. The present invention relates to a combustion chamber device.

If the piston has an oval or oval cross section, it is natural that the combustion chamber above it will also have an oval or oval cross section. Because it is longer in one direction, the flame propagation time during the explosion stroke becomes longer, leading to a decrease in combustion efficiency compared to a normal internal combustion engine that has a piston with a circular cross section, and the volume of the combustion chamber increases, resulting in a high compression ratio. There is an inconvenience that is difficult to remove.

SUMMARY OF THE INVENTION An object of the present invention is to provide a combustion chamber device for an internal combustion engine that has a simple structure and eliminates such inconveniences.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. A cylinder block 1 is formed with a cylinder hole 2 having an oval cross section, and a piston 3 having an oval cross section can freely slide into the cylinder hole 2. is mated to. A piston pin 4 is horizontally suspended in the longitudinal direction of the piston 3, the small ends of two connecting rods 5 are connected to this piston pin 4, and the large ends of these connecting rods 5 are connected to a crankshaft 6. be done. Note that 5' is another connecting rod connected to the crankshaft 6, which is arranged in a V-shape with the cylinder block 1.
It is connected to a piston 3 in another cylinder block 1 (not shown).

A gasket 7 is installed on the top of the cylinder block 1.
A cylinder head 8 is attached through the cylinder head 8, and a combustion chamber 11 is formed by the combustion chamber wall 9 formed on the lower surface of the cylinder head 8 and the upper surface of the piston 3. A partition wall 10 is integrally vertically disposed at a longitudinally intermediate portion of the combustion chamber wall 9 so as to cross the combustion chamber 11. The partition wall 10 divides the combustion chamber 11 into two compartments C in the longitudinal direction. , C. Thus, the partition wall 10 does not completely partition the two compartments C, C, but allows them to communicate with each other at both ends of the partition wall 10. Two intake valve ports 12 and two exhaust valve ports 13 are opened facing each other in the combustion chamber wall 9 of each compartment C, and each intake valve port 12 and two exhaust valve ports 13 are respectively connected to the cylinder head 8. It communicates with the intake port 14 and exhaust port 15 that are formed.

An electrode 17 of a spark plug 16 screwed onto the cylinder head 8 is exposed at the center of each compartment C.

During the intake stroke of the engine, the air-fuel mixture sucked into the combustion chamber 11 through the intake valve port 12 is ignited by electric sparks from the two spark plugs 16 near the end of the compression stroke. The resulting flame is spark plug 1
6, the air-fuel mixture in the combustion chamber 11 is combusted.
1 is divided into two compartments C and C by a partition wall 10, so the time for the combustion flame to propagate in all directions from the ignition plug 16 provided in each compartment C is shortened. , the air-fuel mixture quickly spreads over the entire area in the two compartments C and C, and the air-fuel mixture can be quickly and efficiently combusted.

In the above embodiment, the combustion chamber is divided into two parts by a partition wall.
Although we have explained the case where the compartment is divided into one compartment, it may be divided into three or more compartments, and even in that case, each compartment has its own intake and exhaust valve ports, and is also provided with a spark plug. . Further, although the piston and cylinder holes have an oval cross section, they may be oval.

As described above, according to the present invention, the combustion chamber above the piston, which is formed in an oval or elliptical shape, is divided into a plurality of compartments by a partition wall hanging down from the combustion chamber of the cylinder head, and each compartment is divided into a plurality of compartments. Since an ignition plug is installed in each compartment, the propagation time of the combustion flame obtained by igniting the air-fuel mixture can be shortened, and the air-fuel mixture in the compartment can be burned quickly and efficiently. High combustion efficiency can be obtained, which is no different from an engine with two cylinders.

Furthermore, the presence of the partition wall reduces the total volume of the combustion chamber, making it possible to increase the compression ratio.

[Brief explanation of the drawing]

Fig. 1 is a rear view of a cylinder head equipped with the device of the present invention, Fig. 2 is a sectional view of the engine body taken longitudinally from the line in Fig. 1, and Fig. 3 is a sectional view of the engine main body taken longitudinally from the line in Fig. 1. It is a diagram. C...Separate room, 1...Cylinder block, 2...
... Cylinder hole, 3 ... Piston, 8 ... Cylinder head, 10 ... Partition wall, 11 ... Combustion chamber.

Claims (1)

[Claims] 1. A piston having an oval or oval cross section, a cylinder block having a cylinder hole also having an oval or oval cross section into which the piston slides, and a cylinder head defining a combustion chamber on the piston. In an internal combustion engine, a partition wall projecting into the combustion chamber is vertically provided on an inner wall surface of a cylinder head defining a part of the combustion chamber, and the partition wall divides the combustion chamber into a plurality of compartment chambers. A combustion chamber device for an internal combustion engine, in which each compartment is provided with a spark plug.