JPH07113452A - Revolution conversion mechanism for reciprocating motion by cam - Google Patents

Abstract

PURPOSE:To suppress the side pressure applied to a piston, improve efficiency, reduce vibration and drastically reduce dimension and weight, by revolving a cam on the inner wall of an ellipse without using a crank, in reciprocating motion. CONSTITUTION:When, a similarly with the case of a reciprocating engine, an intake device, ignitor, and an exhaust device are installed on the cylinders 5 and 5a, and camshafts 2 and 2a are revolved by a cell motor, the cam having the longer length between the cams 3 and 3a starts revolution, sliding on the inner wall of an elliptical case 7 which is formed integrally with pistons 4 and 4a. When the longer top end between the cams 3 and 3a is on the apsis side inner walls of the ellipse 7, the pistons 4 and 4a are at the neutral positions, and when the longer top end between the cams 3 and 3a reaches the inner walls on the piston 4 side that is the minor axis side of the ellipse 7, the chamber of the cylinder 5 is in a compressed state, and at this time, the chamber of the cylinder 5a is in an intake state. When explosion occurs in the chamber of the cylinder 5, the cams 3 and 3a slide on the inner wall of the piston 4, and start revolution.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a device that converts a reciprocating motion of an internal combustion engine or an external combustion engine into a rotary motion and can be replaced with a crankshaft.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view of a conventional reciprocating engine. The crankshaft 9 and the connecting rod 10 are used to convert the reciprocating motion of the piston 4b into rotary motion.

The connecting rod of 10 has a lateral movement due to the reciprocating movement of the piston of 4b, so that a pressure for pressing the piston of 4b to the side surface of the cylinder of 5b is generated.

In such a crankshaft that changes reciprocating motion into rotary motion, lateral pressure is generated in the piston, and frictional resistance causes a decrease in efficiency and vibration. Moreover, the weight of the crankshaft is increased.

FIG. 5 is a sectional view of a double acting Stirling engine. The Stirling engine obtains reciprocating motion in a piston on the principle of expansion and contraction of working gas.

In FIG. 5, 5c is a cylinder, 4c is a piston, 14 is a heater, 15 is a regenerator, 16 is a cooler, 11
Is a sealing device, 17 is a piston rod, 10a is a connecting rod, 9a is a crankshaft, 13 is an expansion chamber, and 12 is a low-pressure chamber.

Working gas flows through the expansion chambers 13 and 14, the heaters 14, the heat accumulators 15, the coolers 16 and the low pressure chambers 12.

The heater of 14 is heated to about 750 ° C. at the time of starting. When the piston of 4c is lowered by the starter motor, the working gas in the low pressure chamber of 12 flows into the expansion chamber of 13, is heated by the heater of 14 and becomes high pressure, and the force for lowering the piston of 4c is generated. When the piston of 4c rises due to the reaction movement of the crankshaft of 9a, the working gas in the expansion chamber of 13 flows into the low pressure chamber of 12 and is cooled by the cooler of 16 to a low pressure.

The double-acting Stirling engine actually has four cylinders and a crank advance angle of 60 ° to 90 °, and the expansion chamber and the low pressure chamber do not circulate in one cylinder but one among the four cylinders. It is distributed while shifting. As described above, the Stirling engine is an external combustion engine that continuously reciprocates high pressure and low pressure by heating and cooling the working gas.

[0010]

In the mechanism in which the reciprocating motion of the reciprocating engine is converted into the rotary motion by the crankshaft, lateral pressure is generated in the piston, which causes frictional resistance to reduce efficiency and cause vibration.

[0011] The subject of practical application of the Stirling engine is how to prevent leakage of the working gas and obtain durability.

In FIG. 5, four piston rods with 17 piston rods are used.
The side pressure to the piston of c is suppressed, the leak of the working gas from the expansion chamber of 13 is prevented, and the leak of the working gas to the crank chamber is prevented by the sealing device of 11.

At present, companies that are researching and developing Stirling engines have made various studies on the material of the sealing devices.

[0014]

Means for Solving the Problems The present invention does not use a crank so as not to generate lateral pressure in reciprocating motion of a piston,
An elliptical hole is formed in the center of the upper and lower pistons, and two reciprocating cams are used to convert the reciprocating motion into a rotary motion.

When the two counter-rotating cams slide around the inner wall of the ellipse, they slide around the inner wall opposite to each other, so that the forces cancel each other out and no lateral pressure is applied to the piston.

This is an attempt to solve the problem of not using a sealing device in the Stirling engine.

[0017]

The present invention will be described by taking the operation of the reciprocating engine as an example. In the present invention, there are cylinders at the top and bottom,
The upper and lower cylinders have integrated pistons. An elliptical hollow hole is provided in the center of the integral piston.

Left and right independent shafts are attached by bearings to the center of the fixed block case. In the block case, a cam fixed to the tip of the shaft is in contact with the inner wall of the ellipse at the center of the integrated piston.

The integral ellipse at the center of the piston has a short vertical dimension and a long horizontal dimension. The upper piston reaches top dead center when the long dimension of the cam reaches the upper position within the ellipse.

Since the camshaft is designed to rotate in the reverse direction, when the tip of the long dimension of the cam reaches the left and right walls in the ellipse, the end of the ellipse left or right from the center point of the ellipse. Since the dimension up to is the same as the dimension from the center point of the cam to the tip of the long dimension of the cam, no lateral force is generated.

When an intake device, an ignition device, and an exhaust device for the air-fuel mixture are provided in the upper and lower cylinders and intake, compression, explosion, and exhaust are generated by the same mechanism as the reciprocating engine, the piston reciprocates, and the integral type A force is generated that causes the cam, which is in contact with the inner wall of the ellipse of the piston, to slide around from the shorter dimension of the inner wall to the longer dimension. The above continuation rotates the cam to generate rotational power.

[0022]

EXAMPLES Examples of the present invention will be described with reference to FIGS.
It will be explained based on. Reference numeral 1 is a fixed block case. Cylinder blocks 5 and 5a are fixed above and below the block case 1. Two camshafts are mounted by bearings at the center of one block case. The pistons 4 and 4a are of an integral type, and have a structure in which an elliptical inner wall of 7 is hollowed out at the center of the upper and lower pistons.
The pistons 4 and 4a are assembled in the cylinders 5 and 5a by the piston rings 8 and 8a, respectively.
On the inner wall of the ellipse of 7 in the center of the piston of 4, 4a, 3,
Attached to the longer end of the cam of 3a 6,
The roller bearing 6a is in contact. 2, 2 in FIG.
The camshaft a is attached to the block case 1 independently of left and right, and is configured to rotate in the reverse direction.
1, 2 and 3 are drawn with the Stirling engine in mind.

Next, the operation will be described. As in the reciprocating engine, when the intake device, the ignition device, and the exhaust device are attached to the cylinders of 5 and 5a, and the cam shafts of 2 and 2a are rotated by the starter motor, the longer dimension of the cams of 3 and 3a is 7. Start sliding around the inner wall of the ellipse. 3, 3a
When the long sized tip of the cam is on the left and right inner walls of the long ellipse of 7, the pistons of 4, 4a are in the neutral position and the long tip of the 3,3a cam is of the 7 ellipse. When the inner wall on the piston side of the short dimension 4 is reached, the cylinder chamber of 5 is in compression. At this time, the cylinder chamber 5a is in a suction state. When an explosion occurs in the cylinder chamber of 5, the long tip of the cam of 3, 3a begins to slide to the longer side of the ellipse of 7 from the inner wall on the piston side of 4 of the short ellipse of 7.

The reaction of the explosion in the cylinder chamber of 5 causes 3, 3
The long tip of the cam of a is the short 4 of the ellipse of 7
It reaches the inner wall on the piston side of a. At this time, the cylinder chamber 5a is in a compressed state. At this time, when an explosion occurs in the cylinder chamber of 5a, the above-mentioned reciprocating motion continues and the rotational motion can be taken out by the cams of 3 and 3a.

The present invention was originally devised for a Stirling engine. The Stirling engine requires a cylinder chamber on the high pressure side and a cylinder chamber on the low pressure side, and has two cylinder chambers like the cylinders 5 and 5a of the present invention, and when one cylinder chamber is in the suction state,
The mechanism in which the other cylinder chamber is in an explosive state is essential for the Stirling engine.

In the present invention, since there is no piston rod, a sealing device is unnecessary and there is no fear of leakage of working gas.

In the present invention, the lateral pressures of the counter rotating cams 3 and 3a cancel each other out, so that the lateral pressure to the pistons 4 and 4a is not generated, so that the wear of the piston rings 8 and 8a is minimal and the leakage of the working gas is small. I think that can prevent.

[0028]

EFFECTS OF THE INVENTION Since the present invention has been devised to change the reciprocating motion to the rotary motion by the reverse rotating cam without passing through the crank, by suppressing the lateral pressure to the piston, the efficiency is improved, the vibration is reduced, and the size, It seems to enable a significant weight loss. In addition, the Stirling engine prevents working gas from leaking, and is expected to be put into practical use.

It is considered that the present invention can be used as a pump for hydraulically or pneumatically rotating a shaft by power.
Also, according to the reversible cycle theory of the Stirling engine,
It can also be used as a refrigerator.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a perspective view.

[Fig. 2] Front sectional view

[Fig. 3] Side sectional view

FIG. 4 is a sectional view of the reciprocating engine.

FIG. 5 is a sectional view of a double-acting Stirling engine.

[Explanation of symbols]

1 is a fixed block case, 2 is a camshaft, 3
Is a cam, 4 is a piston, 5 is a cylinder, 6 is a roller bearing, 7 is an elliptical case integrally formed with the piston of 4, 8 is a piston ring, 9 is a crankshaft, 10
Is a connecting rod, 11 is a sealing device, 12 is a compression chamber, 13 is an expansion chamber, 14 is a heater, 15 is a heat storage device, and 16 is a cooler.

Claims (3)

[Claims] 1. A mechanism for reciprocating the rotation by rotating a cam on an inner surface of an ellipse without using a crank. 2. The type according to claim 1, wherein cylinders are provided above and below an integral block case, and integral pistons are incorporated above and below to perform explosive expansion in the upper and lower cylinders or power conversion of expansion and contraction of working gas. . 3. The type according to claim 1, wherein two cams contacting the inner wall of the ellipse located at the center of the upper and lower integral pistons rotate in opposite directions to each other.