KR19980055479A - Valve opening and closing device of automobile - Google Patents

Abstract

The present invention relates to a valve opening and closing of an automobile including a crankshaft interlocked with a piston, a camshaft interlocked with the crankshaft, and an intake / exhaust valve slid up and down in the cylinder head in contact with a cam formed on the camshaft. The present invention relates to a smooth up and down movement of the valve to prevent wear and seizure of the valve stem. To this end, the valve opening and closing mechanism has a valve stem 9 fitted therein, and a lubrication member 10 is inserted into the valve guide 8 for guiding the upper and lower slides of the valve stem and connected to the valve guide. The technical feature is to reduce the friction of the valve stem.

Description

Valve opening and closing device of automobile

The present invention relates to a valve opening device of an automobile, and more particularly to a valve guide for guiding the up and down operation of the valve for opening and closing the intake port and exhaust port.

As is well known, the engine of an automobile representing an internal combustion engine is composed of a mechanism of a piston, a connecting rod and a crankshaft, and the piston rotates linearly in a cylindrical cylinder to rotate the crankshaft through a connecting rod. The rotational force of the crankshaft drives the wheels through the power train.

The engine is composed of a cylinder block, a cylinder head and an oil pan in an outer structure surrounding the cylinder.

In addition, the engine includes an intake / exhaust valve for opening and closing the intake and exhaust ports for supplying a mixer or exhausting combustion gas to a combustion chamber formed in an upper space of the cylinder head and the piston.

The intake / exhaust valve is operated by a valve opening / closing mechanism interlocked with the crankshaft of the engine. When the camshaft connected to the crankshaft and the belt rotates the eccentric cam, the valve in contact with the cam opens / closes the intake / exhaust port. The outside air is sucked by the engine negative pressure generated by the up and down movement of the piston, and the combustion gas is exhausted.

Here, the structure of a conventionally known valve opening and closing mechanism is shown well in FIG.

Reference numeral 1 in the drawings refers to the entire cylinder head. Inlet and exhaust ports 2 and 3 are formed in the cylinder head 1, and valves 4 are provided in the respective ports, and are linked to the cam 5 to open and close.

A hydraulic lash adjuster (HLA) 6 is installed at the rear end of the valve 4 so that the valve gap is automatically adjusted. In addition, the valve 4 is supported by the spring 7 to always receive an upward force to close the intake or exhaust port 3.

The valve 4 is operated in conjunction with the rotation of the cam 5 up and down, thereby opening and closing the intake or exhaust ports.

In the conventional valve opening and closing mechanism having the above-described structure, the valve 4 is guided to the valve guide 8 fitted to the cylinder head 1 and slides up and down.

However, since the conventional valve 4 and the valve guide 8 are not lubricated smoothly, the friction is increased during the up and down movement, and the wear and seizure (the phenomenon that the valve and the valve guide stick together) occurs. There is a problem.

In order to solve the problems of the prior art, the present invention is to facilitate the lubrication action of the valve and the valve guide, it is possible to prevent the wear and seizure of the valve.

1 is a cross-sectional view showing a valve opening and closing device of a conventional vehicle.

Figure 2 is a partial cutaway cross-sectional view showing a valve opening and closing device of the vehicle according to the present invention.

* Description of the symbols for the main parts of the drawings *

4-Valve 8-Valve Guide

9-Valve stem 10-Lubrication member

In order to achieve the above object, the present invention proposes a valve opening and closing device for a vehicle realized by the following means.

That is, in the valve opening and closing mechanism of the present invention, a valve stem is fitted, and a lubrication member is inserted into an inside of a valve guide for guiding up and down slides of the valve stem, thereby reducing friction of the valve stem in contact with the valve guide. It is a technical feature.

EXAMPLE

EMBODIMENT OF THE INVENTION Hereinafter, one preferred embodiment which implements this invention is described in detail based on an accompanying drawing.

2 is a cross-sectional view showing a valve opening and closing device for a vehicle according to the present embodiment. In describing the present embodiment, the same reference numerals are used for the configuration of the present embodiment, which is the same as the drawings cited in the prior art, and will not be described again for clarity.

In the drawings, reference numeral 1 denotes a cylinder head, 3 denotes an exhaust port, 4 denotes an exhaust valve, 5 denotes a cam shaft and a cam interlocked with a crankshaft, and 6 denotes a hydraulic clearance adjust. do.

In the exhaust valve 4 of the present embodiment, the hydraulic gap adjust 7 and the valve stem 9 slide up and down by rotation of the cam 6 interlocked with the crankshaft when the engine is driven. (3) will be opened and closed.

Here, the valve guide 8 according to the present embodiment is provided with a lubrication member 10 on the contact surface with the valve stem 9 to smoothly move the valve 4 and the valve stem 9 up and down. Is done.

The lubrication member 10 is to prevent friction and wear of the valve stem 9, and is formed of graphite, which is a material having high lubricity.

According to the above-described configuration of the embodiment, the valve 4 and the valve stem 9 are opened and closed while being in contact with the lubrication member 9 when the valve 4 and the valve stem 9 move up and down by driving the engine. do.

In this case, the lubrication member 9 prevents hard contact with the valve stem 9 due to the properties of the material, thereby minimizing wear and friction with the valve stem 9.

On the other hand, the above embodiment has been described only for the exhaust valve, but is not limited thereto, and the same applies to the intake valve.

Through the embodiments described above, it can be seen that the valve opening and closing device of the vehicle according to the present invention substantially solves the problems of the prior art.

That is, the intake / exhaust valve of the present invention achieves the effect of the smooth up and down slide.

This effect ultimately minimizes the friction and wear of the valve stem, resulting in higher engine performance.

On the other hand, the present invention is not limited to the above specific preferred embodiment, and any person having ordinary knowledge in the field to which the invention belongs without departing from the gist of the invention claimed in the claims, various changes Would be possible.

Claims (1)

A crankshaft interlocked with the piston reciprocating in the cylinder, a camshaft interlocked with the crankshaft, a cam formed on the camshaft, an intake / exhaust valve which is in contact with the cam and slides up and down in the cylinder head; In the valve opening and closing device of a vehicle comprising a spring that is carried so that the intake and exhaust valves are always closed, a lubrication member is formed on the inner circumferential surface of the valve guide to guide the up and down movement of the intake and exhaust valves; Valve opening and closing device of automobile.