KR19990035122A - Tappet structure of the engine intake / exhaust valve with oil groove formed on the contact surface of cam - Google Patents

Abstract

The present invention relates to a tappet structure of an engine intake / exhaust valve in which an oil groove is formed on a contact surface of a cam. In particular, in an intake / exhaust valve of an engine, at least one oil circulation is performed on the tappet contact surface of an intake / exhaust valve reciprocated with rotation of the cam. By forming a groove, the cam's rotation is converted into a reciprocating motion so that oil is provided to the oil circulation groove of the tappet when the intake and exhaust valve is opened and closed, thereby reducing friction generated between the contact surface of the tappet and the contact surface of the cam, thereby reducing engine output. It relates to the cam shaft of the engine having an oil groove on the tappet contact surface, characterized in that to enhance the noise and to reduce the noise caused by the perturbation of the cam and the tappet.

Description

Tappet structure of the engine intake / exhaust valve with oil groove formed on the contact surface of cam

The present invention relates to a tappet structure of an engine intake / exhaust valve in which an oil groove is formed on a contact surface of a cam. In particular, in an intake / exhaust valve of an engine, at least one oil circulation is performed on the tappet contact surface of an intake / exhaust valve reciprocated with rotation of the cam. By forming a groove, the cam's rotation is converted into a reciprocating motion so that oil is provided to the oil circulation groove of the tappet when the intake and exhaust valve is opened and closed, thereby reducing friction generated between the contact surface of the tappet and the contact surface of the cam, thereby reducing engine output. It relates to the cam shaft of the engine having an oil groove on the tappet contact surface, characterized in that to enhance the noise and to reduce the noise caused by the perturbation of the cam and the tappet.

In general, the lubrication of the engine has an important meaning for cooling the engine while reducing the frictional resistance of the engine.

Engine oil is injected to the engine for this lubrication. The engine lubrication method is by oil pump pumping and splash of the main movement part, and the engine oil is collected in the oil pan under the engine and the oil pump is pumped. Wet pump method is used to send the main part of the furnace. Also, special engines such as racing engines use dry sump method that does not collect engine oil in the oil pan.

The lubrication inside the engine lubricates everything from the valve mechanism to the cylinder, as well as the main moving parts. The frictional resistance of the lubrication to the crankshaft, connecting rod and piston of the main moving parts, as well as the piston and the cylinder become hot Cooling takes up a large proportion, and the airtightness of the pistons and cylinders is also maintained by the engine oil.

The lubrication of the crankshaft bearing and the connecting rod bearing is made by pressurization by the oil pump, the lubrication of the piston and the cylinder wall is also made by the pressurization by the oil pump, and the lubrication of the piston and the cylinder wall is caused by the rotation of the crankshaft. By scattering of engine oil

Here, the lubrication of the camshaft, rocker arm and intake and exhaust valve of the valve unit reduces perturbation resistance of this part, helps the heat dissipation of the exhaust valve and cools it. The valve unit is fed with lubricant from the rocker arm.

On the other hand, the oil film of the engine oil is very thin, but unless the oil film of the engine oil is broken, the metal of the rotating part or the sliding part does not come into direct contact with each other, and when the engine oil is injected into the rotating part, the shaft becomes the engine. The frictional resistance is greatly reduced because the oil is held evenly by the centrifugal force of the bearing.

Referring to the oil circulation path of the general engine, as shown in FIG. 1, the oil contained in the oil pan 10 is removed from impurities in the oil strainer 20 and then pumped by the oil pump 30 to the oil filter 40. The filtered and filtered oil is splattered between the friction portion of the crankshaft 51 of the cylinder block 50 and the connecting rod 52 to lubricate between the piston 53 and the cylinder wall 54. And the oil transferred through the cylinder head 60 has a circulation path for lubricating the friction portion of the cam shaft 61 and the valve opening and closing mechanism 62 and then drained back to the oil pan (10).

Fig. 2 is an enlarged view of the main portion of the DOHC engine for explaining the present invention, and shows the relationship between the contact surface of the camshaft and the intake / exhaust valve.

When the crank shaft 51 is rotated by the driving of the engine, the crank shaft 51 and the cam shaft 61 connected to the timing belt 55 are rotated, and the cam is integrally formed with the cam shaft 61. When the 61a rotates, the intake / exhaust valve 62 located at the bottom of the cam flows at a predetermined time interval.

In this case, as described above, the oil is supplied to the valve 62 while the oil is supplied to the cam shaft 6, so as to avoid friction generated by direct contact between the metal structures.

However, the cam contact surface and the tappet contact surface of the valve are manufactured so that there is no clearance, and there is a problem of directly perturbing because there is no oil supply passage.

The reason why the clearance between the cam and the tappet of the valve is not provided is to maintain the high speed performance by narrowing the cam and the valve to increase the opening and closing response of the valve. However, as described above, the cam and the valve are directly rubbed and thus have a long service life. In addition to shortening and increasing noise, there is a problem that acts as a cause of lowering the engine output when aging.

The present invention is to solve the above problems, by adding a means for lubricating the tappet contact surface rubbed on the cam to prevent the cam and valve tappets from perturbing directly to reduce engine noise and increase the engine output The purpose is to make it.

As a means for achieving the above object,

The present invention forms at least one oil circulation groove in the tappet contact surface of the intake and exhaust valve reciprocated according to the rotation of the cam, by switching the cam rotation to reciprocating movement of the tappet oil circulation groove of opening and closing the intake and exhaust valve It is characterized by the configuration that the oil is provided.

1 is a schematic diagram of an engine showing a general oil circulation path.

2 is an enlarged view illustrating main parts of a DOHC engine for explaining the present invention;

3 is a perspective view of the present invention

4A is a front view of FIG. 3.

4b is a sectional view taken along the line A-A of FIG.

<Explanation of symbols for main parts of the drawings>

10; Oil Pan 20: Oil Strainer

30: oil pump 40: oil filter

50: cylinder block 51: crankshaft

52: connecting rod 53: piston

54: cylinder wall 55: timing belt

60: cylinder head 61: cam shaft

61a: cam 62: intake and exhaust valve

62a: tappet 62b: oil circulation groove

Hereinafter, described in detail with reference to the drawings.

FIG. 3 is a perspective view of the present invention, FIG. 4A is a front view of FIG. 3, and FIG. 4B is an AA sectional view of FIG. 3. In the intake / exhaust valve 62 of the engine, the intake / exhaust valve 62 reciprocates with the rotation of the cam. At least one oil circulation groove 62b is formed on the contact surface of the tappet 62a, thereby converting the rotation of the cam 62a into reciprocating motion so that the intake and exhaust valve 62 is opened and closed. The oil circulation groove 62b has a configuration such that oil is provided.

In the present invention configured as described above, when the engine is first operated by the ignition switch, the crankshaft 51 is rotated due to the driving of the engine. When the crank shaft 51 is rotated, the cam shaft 51 connected to the crank shaft 51 and the timing belt 55 is rotated, and the cam 61a is integrally formed with the cam shaft 61. Rotating) causes the intake and exhaust valves 62 located at the bottom of the cam to flow at regular time intervals.

Here, the cam 61a integrally formed on the cam shaft 61 opens and closes the intake / exhaust valve 62 at a predetermined time interval to explode fuel in the combustion chamber of the engine to rotate the crank shaft 51.

When the cam shaft 61 drives the valve 62, the oil supplied to the cam shaft 61 is provided to the valve 62, and then circulated to the oil strainer, where the oil supplied to the cam shaft 61 is provided. Some of it flows along the oil passage formed in the intake and exhaust valve 62.

Therefore, when the cam 61a integrally formed on the cam shaft 61 and the tappet 62a of the valve lift contact, oil is supplied to the oil circulation groove 62b formed in the tappet 62a of the intake and exhaust valve 62. In this case, it is possible to prevent the oil film formed from being in direct contact with the metals.

That is, when the intake and exhaust valve 62 reciprocates, engine oil is continuously supplied to the oil circulation groove 62b formed on the tappet 62a surface of the intake and exhaust valve 62, and the oil prevents direct contact between metals. This prevents the perturbation of the cam 61a and the tappet 62a, which not only increases the service life but also helps to increase the engine output.

As described above, the present invention forms at least one oil circulation groove in the tappet contact surface of the intake and exhaust valve reciprocated according to the rotation of the cam, thereby converting the rotation of the cam into a reciprocating motion, thereby opening and closing the intake and exhaust valve. By providing the oil in the oil circulation groove of the oil, the friction between the contact surface of the tappet and the contact surface of the cam is increased, thereby increasing the engine power and reducing the noise caused by the perturbation of the cam and the tappet.

Claims (1)

In the intake and exhaust valve 62 of the engine, at least one or more oil circulation grooves 62b are formed on the contact surface of the tappet 62a of the intake and exhaust valve 62, which is reciprocated as the cam rotates, so that the cam 62a is rotated. The engine intake / exhaust in which the oil groove is formed on the contact surface of the cam, characterized in that the oil is provided in the oil circulation groove 62b of the tappet 62a when the tappet is switched to the reciprocating motion to open and close the intake and exhaust valve 62. Tappet structure of the valve.