KR20050076000A - Cam type engine - Google Patents

Abstract

The cam engine according to the present invention includes a casing 30 provided with a plurality of cylinders radially around a cam case, a piston 36 reciprocating in the cylinder, and an output shaft provided at the center of the cam case. Cam 40, a main roller 44 installed on the piston so as to be rotatable externally to the cam, and an auxiliary roller installed on the piston so that the main roller does not depart from the outer circumferential surface of the cam and pulls down the piston. Comprising (46), the cam 40 is provided with a hump track portion 50 is formed with track grooves (50a, 50b) that the auxiliary roller 46 rides and rolls, the main roller 44 and the auxiliary roller Since 46 is installed on the same axis, the main roller rolls on the track surface of the cam, and the auxiliary roller rolls on the track groove of the hump track part, so that the output shaft rotates smoothly. You can get a big output.

Description

Cam type engine

The present invention relates to a cam type engine, and more particularly, to a cam type engine having a cam and a hump track portion.

Conventionally, gasoline engines and diesel engines have a piston-crankshaft mechanism in which a piston and a crankshaft are connected by connecting rods in order to convert the linear motion of the reciprocating piston into a rotational motion in the cylinder. In a four-stroke engine, two reciprocating motions of the piston cause one crankshaft to explode once during a four-stroke cycle of intake, compression, expansion, and exhaust.

Such a reciprocating engine has a limitation in obtaining a large output because a single explosion occurs between two reciprocating motions of the piston, and the maximum value of this side pressure is large because the inertia force of the connecting rod acts on the piston in addition to the reaction force of the output torque. Friction and impact on the cylinder, and the connecting rod and the connection between the piston and the crankshaft are continuously applied in different directions, so the material with high strength, rigidity and yield point is required. The use of a and crankshaft limits the engine's weight and weight.

In order to overcome the limitation of such a reciprocating engine, a conventional cam engine is disclosed in Japanese Patent Laid-Open No. 8-4550.

As shown in FIGS. 1 and 2, the Japanese Unexamined Patent Publication No. Hei 8-4550 integrally forms two cylinders 4 facing radially at intervals of 180 degrees around the cam case 2 integrally. ), An output shaft 6 extending into the cam case 2, two or more even cam mounts 8a and 8b at equal intervals, and a rim 8c according to a cam curve. 2) rotatably supporting the main rollers and the auxiliary rollers 10, 12, and 14, which are installed in the cam 8 and slidably in the cylinder 4, externally and inscribed to the rim 8c of the cam, respectively. It is a structure provided with the piston 16, the suction and exhaust means 18 and 20, and the ignition means 22 provided in each said cylinder 4. As shown in FIG.

However, in the conventional cam type engine disclosed in Japanese Patent Laid-Open No. Hei 8-4550, the cam has a curved cam surface, so that the main roller 10 and the auxiliary roller 12 are located at different distances radially from the center of the cam. (14) is a shape in which the trajectory curves drawn at the center thereof do not resemble each other, and in some portions, the two trajectory curves cross each other, so that the main roller 10 and the auxiliary rollers 12 and 14 are connected to the piston ( In the structure installed in the piston 16 with the rim 8c of the cam interposed on the center axis of 16), there is a problem in that the output shaft cannot be rotated because the cam is caught and cannot be operated.

Accordingly, the present invention has been made to solve the problem that the conventional cam engine can not be implemented because it is impossible to operate, the object of the present invention is to smoothly output shaft fixed cam in the cam engine is installed in the main roller and the auxiliary roller piston To provide a rotating cam engine.

A cam engine according to the present invention includes a casing provided with a plurality of cylinders radially around a cam case, a piston reciprocating in the cylinder, an cam provided at an output shaft provided at the center of the cam case, and the cam. A main roller installed on the piston so as to be rotatable externally, and an auxiliary roller installed on the piston so that the main roller does not deviate from the outer circumferential surface of the cam and pulls down the piston, and the auxiliary roller is mounted on the cam. A hump track portion having a rolling track groove is provided, and the main roller and the auxiliary roller are installed on the same axis.

The cam has a protruding portion formed in the middle to form a hump track portion, and a raceway surface on which the main roller is circumscribed is formed on both sides of the protrusion in the axial direction, and the raceway groove on which the auxiliary roller rides and rolls is formed on the side of the protruding portion. Structure.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 and 4, four cylinders 34 radially around the cam case 32 are provided with a casing 30 integrally formed at 90 degree intervals, and the cylinders 34 A reciprocating piston 36 is provided inside, and a cam 40 is fixed to the output shaft 38 provided at the center of the cam case 32 by a key 42, and the cam 36 is connected to the cam 36. The main roller 44 is rotatably installed outside the raceway surface (outer circumferential surface: 40a) of the 40, and the main roller 44 does not escape from the raceway surface (outer circumferential surface) of the cam 40, and the piston An auxiliary roller 46 is installed in the piston 36 to pull down the piston.

The cam 40 is provided with hump tracks 50 formed with track grooves 50a and 50b on which the auxiliary rollers 46 ride and roll, and the main rollers 44 and the auxiliary rollers 46 are on the same axis. Is installed, the protrusion is formed in the middle of the cam 40 to form the hump track portion 50, the raceway surface (40a) that the main roller 44 is circumscribed on both sides in the axial direction of the protrusion is formed, The track grooves 50a and 50b on which the auxiliary rollers 46 ride and roll are formed on both side surfaces of the protrusion. Therefore, in this embodiment, there are two main rollers 44 and two auxiliary rollers 46, respectively.

The hump track unit 50 may be separated from the cam 40 and fixed to the output shaft 38 by a key while being fixed to the cam 40 by a bolt.

Each cylinder 34 is provided with intake and exhaust means having intake and exhaust valves 56 and 58 and an ignition means having a spark plug 60. In the case of a diesel engine, the cylinder 34 is provided with suction and exhaust means and fuel injection means.

The output shaft 38 is rotatably supported by the bearing 62 in the cam case 32.

The lower part of the piston 36 is dug in the middle to form flanges 36a and 36b on both sides, and each of the flanges 36a and 36b is provided with a pin 64, and both ends of the pin 64 have the main portion. The roller 44 and the auxiliary roller 46 are rotatably installed. In addition, the main roller 44 and the auxiliary roller 46 are preferably rotatably coupled by a roller bearing that is extrapolated to the pin 64.

The cam 40 has a structure in which four cam peaks are formed at intervals of 90 degrees, and the number and shape of the cam peaks can be changed in various ways, and the number of cylinders can also be varied.

The operation of the cam engine according to the present invention configured as described above will be described. In FIG. 3, when the upper piston 36 is referred to as the first piston and the second, third and fourth pistons in the counterclockwise direction, each piston operates the same as shown in FIG. When the output shaft 38 starts to rotate and the cam 40 and the hump track portion 50 rotate counterclockwise, the main roller 44 which rolls in close contact with the track surface 40a of the cam 40 is rolled. In addition, the intake valve 56 is opened while the piston 36 descends the cam mount in the state shown in FIG. 3 by the auxiliary rollers 46 rolling in the track grooves 50a and 50b of the hump track unit 50. The mixed gas flows into the cylinder 34 and reaches the bottom dead center shown in FIG. The cam 40 and the hump track portion 50 are further rotated to raise the piston 36 so that the mixed gas in the cylinder 34 is compressed, and ignited by the spark plug 60 at the top dead center position to explode and expand. Then, the piston 36 descends to reach the bottom dead center and rises again, and the exhaust gas in the cylinder 34 is exhausted through the exhaust valve 58 to be in a state as shown in FIG. In this cycle, the four pistons 36 perform two strokes of intake, compression, expansion, and exhaust while the cam 40 and the hump track portion 50 rotate one rotation.

According to the cam-type engine according to the present invention, the cam 40 and the hump track portion 50 are exploded once in four cylinders during one rotation, so that a small, light weight and large output can be obtained. In addition, since the cam 40 and the hump track portion 50 rotate once for two reciprocating motions of each piston 36, the rotation of the output shaft 38 is reduced, the output rotation speed and heat generation and vibration are suppressed, and energy conversion is performed. The efficiency is good.

According to the cam-type engine according to the present invention, since the main roller rolls on the track surface of the cam, and the auxiliary roller rolls on the track groove of the hump track part, the output shaft rotates smoothly, and large output can be obtained at a small size and light weight. .

1 is a schematic front sectional view of a conventional cam engine;

2 is a schematic side cross-sectional view of the cam engine of FIG. 1;

3 is a schematic front sectional view of a cam engine according to the present invention;

4 is a schematic side cross-sectional view of the cam engine of FIG. 3;

5 is a schematic front sectional view for explaining the operation of the cam type engine according to the present invention;

Fig. 6 is a schematic cam diagram for explaining the operation of the cam engine according to the present invention.

<Description of the symbols for the main parts of the drawings>

32: cam case 34: cylinder

36: piston 38: output shaft

40: cam 44: main roller

46: auxiliary roller 50: hump track portion

Claims (2)

A casing provided with a plurality of cylinders in a radial direction around the cam case, a piston reciprocating in the cylinder, a cam provided at an output shaft provided at the center of the cam case, and rotatably rotatable around the cam. A main roller installed, and an auxiliary roller installed on the piston so that the main roller does not deviate from the outer circumferential surface of the cam and pulls down the piston; The cam is provided with a hump track portion formed with a track groove which the auxiliary roller rides and rolls, And the main roller and the auxiliary roller are installed on the same axis. The method of claim 1, The cam has a protrusion formed in the middle to form a hump track portion, On the axial sides of the protruding portion is formed a raceway surface circumscribed by the main roller, The cam-type engine, characterized in that the track groove which the auxiliary roller rides on the side of the protrusion is formed.