JP2002004801A - Link-type complete expansion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an engine for realizing a high compression ratio and be capable of performing high speed rotation, in an engine of a reciprocating type internal combustion engine with high thermal efficiency and quiet operation which does not accompany explosive sound by converting energy of combustion gas, in a high temperature high pressure state into an effective power, expanding the combustion gas in a cylinder to the same pressure as an atmosphere pressure. SOLUTION: A piston and a crank shaft are intercoupled, through a connecting rod bending at a joint and a swing arm to cause a joint part to effect circular arc movement is coupled by a pin. The piston is provided with a piston rod and a steady arm, which are intercoupled through a pin. By a link mechanism, consisting of the swing arm, the steady arm, and the connecting rod, the stroke length of a reciprocating piston is changed into a long length or a short length by every other stroke and the inner volume of a cylinder is set such that an expansion/exhaust stroke is longer than a suction/ compression stroke.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for converting explosive sound energy discarded into the exhaust of a reciprocating internal combustion engine into an effective output in the engine.

[0002]

2. Description of the Related Art Since a conventional reciprocating internal combustion engine has a simple structure in which a piston and a crankshaft are directly connected by a connecting rod, combustion gas cannot be completely expanded in a cylinder, resulting in loud noise. The expansion energy is released into the atmosphere while the piston is being released.How to improve this, change the length of the reciprocating stroke of the piston so that the suction / compression stroke and the expansion / exhaust stroke are different. For this reason, the connecting rod is articulated and the joint is configured to swing.

[0003]

SUMMARY OF THE INVENTION The present invention relates to a reciprocating internal combustion engine using a conventional articulated connecting rod, in which the side stress applied to the piston is increased and a sufficient compression ratio is obtained as in a diesel type internal combustion engine. Is difficult to design an engine that requires mechanical stress due to its side stress,
And a problem in durability, so that the problem is solved.

[0004]

SUMMARY OF THE INVENTION In a four-cycle piston reciprocating engine, it is possible to convert a part of pressure and heat energy of exhaust gas into mechanical power in the engine. Such an engine has a structure in which the length of the reciprocating motion of the piston can be made different between the intake / compression stroke and the expansion / exhaust stroke.

FIG. 1 is a sectional view of a conventional connecting rod swing type engine. The connecting rod is composed of an upper arm 1 and a lower arm 2, and a swing arm 15 is connected to an articulating pin 6 connecting both of them. The other end of the upper arm 1 is connected to the piston pin 7 and the lower arm 2 is connected to the crank pin 8, and the swing arm 15 swings about the fulcrum pin 5. The fulcrum pin 5 is the cylinder 1
2 is provided on or near the extension of the center line.

When the crankshaft 13 rotates, the joint pin 6
Swings around a fulcrum pin 5 so as to draw an arc. The swing is a difference in the reciprocating length of the piston 7 depending on the right and left distribution angles of the center line of the cylinder 12. That is, if the swinging motion is distributed so that the left side of the center line is small and the right side is large, the reciprocating length of the piston 7 is short when the piston 7 swings to the left and long when the piston 7 swings to the right. Therefore, in order to completely expand the combustion gas in the engine, the movement of the piston 11 when the joint pin 6 swings to the left is the intake / compression stroke, and when the joint pin 6 swings to the right, the expansion / exhaust stroke is designed. I do. In this case, the operation of the engine is such that the piston 11 reciprocates two times while the crankshaft 13 makes one rotation, and the stroke of four cycles ends.

As a principle of the operation of the machine, the mechanism shown in FIG. 1 can completely expand the combustion gas, but it is difficult to make it a practical device. The problem occurs when the piston 11 is in the process of expanding. The angle at which the upper arm 1 of the connecting rod inclines with respect to the center line of the cylinder 12 increases, and the lateral component of the reaction force corresponding to the force by which the combustion gas pushes down the piston 11 is:
Acts as a lateral thrust for forcing the piston 11 against the inner wall of the cylinder 12 and generates a large mechanical frictional resistance. The loss due to the frictional resistance significantly impairs the durability of the engine, and becomes a major obstacle in improving the performance by increasing the rotation speed.

To solve this problem, a link mechanism is provided between the piston pin 7 and the crank pin 8 in which a piston rod 22 and an anti-swing arm 21 shown in FIG. 2 are added. In other words, the swing arm 15 and the anti-swing arm 21 are connected to the upper arm 1 by the joint pins 10 and 6, and a mechanism capable of swinging about the fulcrum pins 5 and 9 to perform a link motion is provided.

[0009]

Since the joint pin 10 connecting the piston rod 22 and the upper arm 1 swings around the fulcrum pin 9 by the anti-swing arm 21, the lateral movement of the piston rod 22 is reduced. As a result, the lateral component of the stress generated in the piston 11 is reduced, and the lateral thrust for strongly pressing the piston 11 against the inner wall of the cylinder 12 is also reduced, so that the generated mechanical friction loss can be suppressed to a level that can be ignored. I can do it.

[0010]

FIG. 3 is a diagram for explaining the operation when the apparatus shown in FIG. 2 actually operates. Indicates the state at the start of the suction stroke. When the crankshaft 13 rotates in the direction of the arrow and the piston 1
1 starts descent. Is the end of the suction stroke and the transition to the compression stroke. Is the end of compression and the point where the process proceeds to the ignition expansion process. Is where the expansion stroke ends and the process moves to the exhaust stroke. The crankshaft 13 makes one rotation and returns to the next stroke.

[0011]

[Effect] The piston 11 is rotated while the crankshaft 13 rotates once.
Reciprocates two times. In this case, the angle at which the piston rod 22 swings about the piston pin 7 is smaller than 1/10 of the angle of the swing movement of the upper arm 1 in FIG. Therefore, the lateral component of the stress corresponding to the pressure of the combustion gas generated in the piston 11 becomes small. That is, since the lateral thrust of the piston 11 becomes very small, the mechanical friction loss is reduced, an engine with a high compression ratio can be realized, and a high-speed rotation operation can be designed.

[0012]

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a connecting rod swing type engine.

FIG. 2 is a longitudinal sectional view of a connecting rod link type fully inflatable engine.

FIG. 3 is an explanatory diagram of the operation of a connecting rod link type engine.
Is the order of the figure showing the movement of continuous operation. Description of the numbered part. 1, upper arm 2, lower arm 3, suction valve 4, exhaust valve 5, fulcrum pin 6, joint pin 7, piston pin 8, crank pin 9 fulcrum pin 10, joint pin 11, piston 12, cylinder 13, cylinder shaft 15, swing Arm 21 Anti-swing arm 22 Piston rod

Claims (1)

[Claims] A piston and a crankshaft are connected by connecting rods (1) and (2) which are bent at joints, and the joints are connected to the free ends of a swing arm (15) swinging about a fixed fulcrum (5). A fully inflatable engine mechanism in which the rotational movement of the crankshaft is changed to the circular movement of the swing arm (15), and the reciprocating length of the piston is varied depending on the right and left distribution angles of the circular movement. Then, a piston rod (22) and an anti-swing arm (21) are added to the swing-arm (15) and the anti-sway arm (2).
1) A link-type fully inflatable engine in which a link structure is formed to reduce the lateral thrust applied to the piston.