JPH0225018B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to internal combustion engines, particularly piston reciprocating engines.

[Prior Art] A conventional internal combustion engine, as seen in a four-stroke piston engine, detonates the air-fuel mixture in the cylinder to push down the piston. A connecting rod is connected to the piston, which rotates a crank with a flywheel attached. Therefore, the reciprocating distance of the piston is determined by the eccentricity of the crank, that is, the radius of rotation, and the compression ratio of the air-fuel mixture is determined. In this way, the maximum/minimum volume ratio within the cylinder is determined as a fixed ratio at the manufacturing stage.

[Problems to be Solved by the Invention] Gasoline, kerosene, light oil, LP gas, and even ethyl alcohol, methyl alcohol, and the like have come to be used as fuel for piston engines. In the case of conventional gasoline fuel only, the optimum ratio is known for the mixture ratio, compression ratio, etc., and the compression ratio etc. is fixed by the piston travel distance determined by the length L coc ωt determined by the crank length L. may be determined. However, in conventional four-stroke piston engines, the reciprocating distance of the piston is variable depending on the diversifying energy sources.
It was not possible to adjust the compression ratio depending on the fuel. Furthermore, in order to change the compression ratio, a different type of crank must be used each time, and the casing to which it is attached must also be changed, which increases costs.

Furthermore, when the air-fuel mixture is drawn into the cylinder, the explosion efficiency will be better if it is made into a turbulent flow, but with the conventional crank type, it is impossible to dynamically adjust the relationship between the descending speed of the piston and the generation of turbulence. Ta.

This invention was made in view of the above circumstances, and it is possible to change the pressure ratio of the mixture depending on the type of fuel, and also to dynamically adjust the descending speed of the piston during suction, improving thermal efficiency. That is, the objective is to provide an internal combustion engine with low fuel consumption.

[Means for solving the problem] In the present invention, a pair of rotating bodies 1 rotatably provided in the casing 1 below the cylinder 2 are provided.
7 and 18, a rotation transmission body 19 that spans these rotation bodies 17 and 18, and a connecting portion 24 that connects this rotation transmission body 19 and the connecting rod 14.

[Operation] The lowering of the piston 10 lowers the connecting rod 14 and pushes down the chain 19 via the connecting portion 24. The operation of the chain 19 rotates the rotating bodies 17 and 18, and the rotational output of the rotating body 18 is taken out as work. The radius of the rotating bodies 17 and 18 can be freely selected, and the stroke of the piston 10 can be freely set, that is, the compression ratio of the air-fuel mixture and the generation of turbulence can be freely adjusted.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows a four-stroke engine, in which a cylindrical cylinder 2 is formed above a casing 1, and a gear chamber 3 is formed below. An intake port 4 communicating with the carburetor and an exhaust port 5 communicating with an exhaust pipe are formed above the cylinder 2, respectively.
A spark plug 7 is replaceably provided between the two. An intake valve 8 is provided at the intake port 4, and an exhaust valve 9 is provided at the exhaust port 5, and these intake valves 8 and exhaust valves 9 are opened and closed.

10 is a cylindrical piston;
0 can slide in the cylinder 2 and move back and forth. The upper surface of the piston 10 faces the spark plug 7, the lower surface thereof faces the gear chamber 3, and a hole 11 opening to the lower surface is provided below the piston 10.
is formed. A shaft 12 is provided approximately in the center of this hole 11, and both ends of the shaft 12 are supported inside the piston 10. Shaft 1
2 is approximately parallel to the upper surface of the piston 10,
That is, the upper end of a connecting rod 14 is rotatably connected to the central portion of the shaft 12, which is perpendicular to the plane of the drawing.

An intermediate shaft 15 and an output shaft 16 are rotatably supported in the gear chamber 3, and the intermediate shaft 15 and the output shaft 16 are approximately parallel to the shaft 12, and the gear chamber 3 is connected to the casing 1. It is set in a prominent shape. intermediate shaft 15
has a small diameter sprocket 17 as a rotating body,
A large diameter sprocket 18 as the other rotating body is coaxially keyed to the output shaft 16, and these sprockets 17 and 18
A chain 19 serving as a rotation transmission body is spanned between.

The lower end of the connecting rod 14 is connected to the chain 19.
It is rotatably connected to the side of the FIGS. 2 and 3 show this connection structure, in which the roller 20 is connected from both sides with a roller link plate 21 and a roller link 22.
These are rotatably connected by a pin 23 passing through the center of the roller 20 to form a chain 19.

To explain the connecting part here, one of the many pins 20 is replaced with a connecting pin 24 having an axial length, and the connecting pin 24 protrudes from the side of one roller link 22.
The lower end of the connecting rod 14 is rotatably connected to the end of the connecting rod 14.

The tips of the intermediate shaft 15 and the output shaft 16 are set back from the plane of movement of the connecting rod 14, and interference with the connecting rod 14 is avoided.
The distance L of the cylinder 6 is shorter than the depth M of the cylinder 2 (L<M). Sprockets 17 and 18 of any radius can be attached during assembly, and the stroke length of the piston can thereby be set appropriately.
The output shaft 16 protrudes outward from the casing 1, and is provided with a flywheel coaxially with the output shaft 16, and is connected to a transmission or the like from which rotational output is taken out. Further, the opening and closing movements of the intake valve 8 and exhaust valve 9 are controlled in synchronization with the rotation of the output shaft 16 or the intermediate shaft 15. Next, the operation will be explained.

When the intake valve 8 descends, the intake port 4 opens and the air-fuel mixture is sucked into the cylinder 2. In this case, the descending speed of the piston 10 is not as simple as the conventional L cosωt, but depends on the radius of the sprockets 17 and 18. By appropriately selecting the ratio, it is possible to obtain a descending speed that causes more turbulence.
Adjust the length of step 9 accordingly.

The bottom dead center of the piston 10 can be freely set within the depth M of the cylinder 2 by appropriately selecting the radii of the sprockets 17 and 18.

In this way, the air-fuel mixture is compressed to the highest thermal efficiency depending on the type of fuel, such as gasoline or alcohol. When ignited by the ignition plank 7, the air-fuel mixture explodes, and the piston 14 descends due to the explosive force. Then, the connecting rod 14 is also pushed in the direction of the arrow in the figure, and the other end of the connecting rod 14 pushes the chain 19 via the connecting pin 24, causing the sprocket 17, shaft 15, sprocket 18, and shaft 16 to
rotates. The rotational force of the shaft 16 is extracted to the outside for work. The next exhaust operation and the next drive stroke are performed by the rotational inertia of the flywheel, chain 19, sprockets 17, 18, etc.

In this way, the engine rotates with the optimum compression ratio and maximum turbulence.

In the above embodiment, a four-stroke engine has been described, but it goes without saying that the present invention can also be applied to a two-stroke engine and a diesel engine, and is not limited to a single cylinder engine, but can also be applied to a plurality of cylinder engines. Furthermore, a V-belt, a flat belt, a wire belt, etc. can also be used as the rotation transmission body.

[Effect of the invention] As explained above, according to this invention,
A gear chamber is provided below the cylinder, a chain is spanned between a pair of sprockets rotatably provided in the gear chamber, and the piston and chain are connected via a connecting rod, so that the reciprocating motion of the piston is converted into the rotational motion of the sprocket. is converting. This makes it possible to adjust the movement range and descending speed of the piston according to the type of fuel, greatly improving thermal efficiency and greatly contributing to fuel savings. Therefore, the size of the test sprocket can be selected to suit the diversification of fuels such as alcohol fuel and LP gas, and the sprocket can be freely replaced during assembly or after completion, and even after the product has been used, local engineers can provide service. Optimal adjustments can be easily made.

Furthermore, as a single cylinder engine, it is lightweight and assembly work is simplified, and by directly connecting and supporting the pair of sprockets to a mechanical device for driving purpose, a compact black box type automatic machine can be made.

By adjusting the diameter of the sprocket, the angle θ between the downward direction of the piston (the axial direction of the cylinder) and the connecting rod becomes much smaller than that of a conventional crankshaft structure, which increases the force that causes the connecting rod to descend due to explosion. is proportional to cosθ, so from the conventional structure, 1/
cosθ times larger. Also, the descending force F of this connecting rod is transmitted to the sprocket via the chain, but since the chain always transmits the force F at right angles to the radial direction at the outer periphery of the sprocket, the sprocket receives a moment of radius x F, or Torque is applied and large torque is obtained from the output shaft.

Next, since the length of the cylinder, that is, the volume of the combustion chamber, can be adjusted as appropriate, it can be made longer than the conventional structure, and a combustion chamber with a larger capacity can be secured.

Furthermore, the evacuation during the exhaust stroke takes longer than the conventional structure due to the long cylinder, and the resistance force against the rising piston due to turbulence etc. is reduced. Therefore, the efficiency of the engine is also improved here.

Furthermore, since the deflection angle θ during the lowering of the connecting rod is small, the force acting at right angles between the piston and the inner wall of the cylinder is small, and the wear of the piston ring due to these sliding forces is reduced. The life of piston rings can be extended.

[Brief explanation of drawings]

FIG. 1 is a side view of the internal combustion engine of the present invention, FIG. 2 is an enlarged plan view of the main part of FIG. 1, and FIG. 3 is a view along the line of the second arrow. 1... Casing, 2... Cylinder, 3... Gear chamber, 10... Piston, 14... Connecting rod, 15
...Intermediate shaft, 16...Output shaft, 17
...Small diameter sprocket, 18...Large diameter sprocket, 19...Chain, 24...Connection pin.

Claims (1)

[Scope of Claims] 1. A reciprocating internal combustion engine comprising a piston that reciprocates within a cylinder provided in a casing, and a connecting rod connected to the piston, comprising: a pair of pistons rotatably provided in a casing below the cylinder; 1. An internal combustion engine comprising: a rotating body; a rotation transmission body extending over these rotation bodies; and a connecting portion connecting the rotation transmission body and the connecting rod. 2. The internal combustion engine according to claim 1, wherein the rotating body is two prongs, and the rotating transmission body is a chain.