KR19990002919U - Valve tappets for automotive engine valves - Google Patents

Abstract

The present invention relates to a valve tappet of an engine valve for an automobile, wherein the cam 2 having an eccentric shaft connected to the cam shaft 1 opens and closes the valve 3 by the rotation of the cam shaft 1. 3) a valve tappet installed at the upper side, the valve 3 being in close contact with the cam 2 and having one end contacting the valve 3 so as to open and close according to the cam diagram, and the other end fixed to the valve seat 4. (5) is installed, and a plurality of thin grooves (5a) in the circumferential direction from the center in the upper surface of the valve tappet (5) in contact with the cam (2) has a structure formed radially, so that is generated on the valve tappet surface Accordingly, since the wear particles which promote the wear of the valve tappet and the cam can be immediately discharged to the outside through the grooves, the opening and closing function of the valve can be improved by extending the durability life of the valve tappet.

Description

Valve tappets for automotive engine valves

The present invention relates to an engine valve installed in an engine of an automobile, and in particular, it is possible to minimize the wear state of the tappet surface due to the contact between the cam of the engine and the valve tappet, thereby preventing the valve opening and closing caused by the wear of the valve tappet. A valve tappet of an engine valve for an automobile is made possible.

In general, a vehicle transmits power generated from an engine to a drive shaft through a power transmission device to drive a vehicle by rotating tires coupled thereto.

In this case, the engine converts the explosive force into a rotational motion to drive the car. The engine generates explosive power through a movement of one cycle of suction, compression, explosion, and exhaust stroke, and the continuous operation of the stroke. For this purpose, the engine requires an intake / exhaust device, a fuel supply device, a cooling device, a lubrication device, and the like.

The intake / exhaust device supplies air and fuel to the combustion chamber and substantially controls one cycle of the combustion chamber, which is performed by opening and closing the intake / exhaust valve installed at the upper portion of the combustion chamber.

Here, the engine as described above, the mixer is introduced into the combustion chamber and the piston compresses it and explodes the mixer by the spark plug, in which the mixer is introduced into the combustion chamber as the intake valve is opened and the intake valve is closed after the explosion. And the exhaust valve is opened so that the combustion gas is discharged to the outside.

That is, the valve opening and closing device for driving the valve, as shown in Figure 2a, the cam 12 having an eccentric shaft connected to the cam shaft 11, the valve 13 is opened and closed by the cam 12, A valve tappet 14 whose one end is in contact with the valve 13 so that the valve 13 is in close contact with the cam 12 to be opened and closed according to the cam diagram, and a tappet seat having the other end of the valve tappet 14 fixed thereto ( 15) and a valve guide 16 for guiding the valve 13 in a linear motion.

Of course, the valve 13 is connected to the crankshaft (not shown), the valve 13 is opened and closed by the cam motion of the valve tappet 17 operated by the cam 12 installed on the cam shaft 11 do.

By the way, the valve opening and closing device configured as described above is to open and close the valve 13 by the continuous contact of the cam 12 and the valve tappet 14, as shown in Figure 2b, the cam 12 and A large number of wear particles are generated by friction of the valve tappet 14, and wear particles occurring at the contact surface of the valve tappet 14 are rapidly promoted by the wear particles, thereby adversely affecting opening and closing of the valve 13. It is done.

In addition, since a large amount of wear particles are included in the lubricating flow rate supplied to the valve assembly in addition to the wear particles generated by the cam 12 and the valve tappet 14 themselves, they act as lubricating oil in the initial state, but wear over time. There was a problem that the particles are discharged to further promote wear of the valve tappet 14 surface.

The present invention has been made to solve the above problems, by forming a groove on the valve tappet surface to discharge the wear particles of the tappet surface generated by the contact of the cam tap and the valve tappet of the engine to the outside. An object of the present invention is to provide a valve tappet of an engine valve for an automobile, which is capable of preventing a valve opening and closing defect due to wear of the valve tappet by minimizing the wear state of the valve tappet.

The present invention for achieving the object of the above bar is connected to the cam shaft to contact the cam with an eccentric shaft so as to open and close the valve, while the valve is in close contact with the cam to open and close the operation according to the cam diagram In the valve tappet of an automotive engine valve fixed to the valve seat while the other end is in contact with the valve, a plurality of thin grooves are formed radially in the circumferential direction from the center on the upper surface of the valve tappet in contact with the cam, and thus wear particles. The structure is characterized in that the outer discharge passage.

That is, since the valve tappet, which receives the rotational force of the cam, is also rotated, wear particles generated by friction between the cam and the valve tappet enter the thin groove of the valve tappet surface, and the collected wear particles are caused by the rotation of the valve tappet. It is to be released to the outside through the groove by centrifugal force.

Therefore, as described above, it is possible to immediately discharge the wear particles generated on the valve tappet surface to promote the wear of the valve tappet and the cam to the outside, thereby improving the opening and closing function of the valve by extending the endurance life to the wear of the valve tappet. It is to be possible.

Figure 1a is a cross-sectional view schematically showing a valve tappet of the engine valve according to the present invention,

1b is a schematic plan view of a valve tappet according to the present invention;

Figure 2a is a cross-sectional view schematically showing a valve tappet of the engine valve according to the prior art,

Figure 2b is a perspective view schematically showing the wear state of the valve tappet.

Explanation of symbols on the main parts of the drawings

1: camshaft 2: cam

3: valve 4: valve seat

5: valve tappet 5a: groove

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

1A is a cross-sectional view of a valve tappet of an engine valve according to the present invention, and FIG. 1B is a plan view of a valve tappet according to the present invention, in which a cam 2 having an eccentric shaft connected to a cam shaft 1 is a cam washer. The valve 3 is installed on the upper part of the valve 3 to open and close the valve 3 by the rotation of the shaft 1, and one end of the valve 3 is in close contact with the cam 2 so as to open and close according to the cam diagram. In addition to contacting), the other end is provided with a valve tappet (5) fixed to the valve seat (4), and a plurality of fine grooves in the circumferential direction from the center on the upper surface of the valve tappet (5) in contact with the cam (2) (5a) is a structure formed radially.

Here, the groove (5a) formed on the valve tappet (5) surface to form a depth of approximately 0.01mm so as not to affect the operation of the cam (2) at all, while inevitably in the plurality of grooves (5a) Since the lubricating oil is stored, the lubricating action may be promoted on the moving surfaces of the cam 2 and the valve tappet 5 to increase the heat dissipation effect.

In addition, the wear particles entering the grooves 5a of the valve tappet 5 are released to the outside by centrifugal force due to the rotation of the valve tappet 5, thereby preventing an increase in frictional force caused by the wear particles. .

That is, wear particles generated by the friction between the cam 2 and the valve tappet 5 enter the thin grooves 5a of the valve tappet 5 surface, and the collected wear particles are formed in the valve tappet 5. It is to be discharged to the outside through the groove (5a) by the centrifugal force by rotation to continuously remove the wear particles while preventing the wear particles collect.

Accordingly, as described above, the wear life of the valve tappet 5 is extended by removing wear particles generated on the surface of the valve tappet 5 to promote wear of the valve tappet 5 and the cam 2. Accordingly, the opening and closing function of the valve 3 and the wear resistance of the valve 3 can be improved as a whole.

As described above, according to the valve tappet of the engine valve for an automobile according to the present invention, it is possible to minimize the wear state of the tappet surface due to the contact between the cam of the engine and the valve tappet, so that the valve opening and closing due to the wear of the valve tappet is poor. There is an effect that can prevent.

Claims (1)

The valve 3 is connected to the cam shaft 1 so as to open and close the valve 3 to the cam 2 having an eccentric shaft, and the valve 3 is in close contact with the cam 2 to perform the opening and closing operation according to the cam diagram. In the valve tappet of the engine valve for automobiles, one end of which is in contact with the valve 3 and the other end is fixed to the valve seat 4, The upper surface of the valve tappet (5) in contact with the cam (2) is a plurality of thin grooves (5a) in the circumferential direction from the center is formed radially, so as to be an external discharge passage of the wear particles Valve tappets on engine valves.