KR19980033650U - Valve opening and closing mechanism of car engine - Google Patents

Abstract

The present invention is a valve opening and closing of a vehicle including a crank shaft interlocked with a piston, a cam shaft 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. As to an appliance; A valve stem seal portion 12 which guides the up and down movement of the intake and exhaust valves 3 and is coupled to an upper side of the valve guide 9 to block the inflow of lubricating oil; The spring seat part 12 which is arrange | positioned facing the spring retainer 7 integrally attached to the rear end of the said valve | bulb, and which the spring 6 carried is formed in one body. The seat seal member 13 of the valve thus formed is inserted into and fixed to the upper end of the valve guide. Therefore, the valve opening and closing mechanism of the present invention can reduce the number of parts and improve the assemblability. In addition, the reliability of the sheet seal member can be improved.

Description

Valve opening and closing mechanism of car engine

The present invention relates to a valve opening and closing mechanism of an automobile engine, and more particularly to a valve opening and closing mechanism for operating the valve up and down to open and close the intake and exhaust ports of the combustion chamber.

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 is configured to drive the wheels through the power train.

Such an engine includes an intake and exhaust valve for opening and closing an intake and exhaust port to supply a mixer or discharge combustion gas to a combustion chamber formed in an upper space of a cylinder head and a piston.

The intake and exhaust valves are operated by a valve opening and closing mechanism interlocked with the crankshaft of the engine. When the cam shaft connected to the crankshaft and the belt rotates the eccentric cam, the valve contacting the cam opens and closes the intake and exhaust ports. 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 or exhaust ports 2 are formed in the cylinder head 1, and valves 3 are provided in each port, and are linked to the cam to open and close.

The valve clearance is adjusted at the rear end of the valve 3 by installing a hydraulic lash adjuster (HLA) or a valve lifter 5 which is a mechanical device.

In addition, the valve 3 is supported by the spring 6 and is always installed to close the intake and exhaust ports 2 by receiving an elastic force upward. To this end, a spring retainer 7 is integrally attached to the rear end of the valve 3 and a spring seat 8 is integrally attached to the cylinder head 1 at a lower predetermined position.

When the intake / exhaust valve 3 is operated in conjunction with the rotation of the cam, the valve guide 9 inserted into the cylinder head 1 and the rubber material attached to the upper side of the valve guide 9 are operated. It is guided by the valve stem chamber 10 and slides upward and downward to open and close the intake and exhaust ports 2.

In the conventional valve opening and closing mechanism having the above-described structure, the spring seat is provided for lifting the intake and exhaust valves by the spring force. In addition, the valve guide is installed to prevent wear of the valve, the valve stem seal is installed to block the lubricating oil from entering the combustion chamber.

However, although the spring seat, the valve guide, and the valve stem seal are both attached to and close to the cylinder head, they are separately produced and assembled separately, thereby increasing the number of parts and degrading the management and assembly of the parts. I have a problem.

In order to solve the problems of the prior art, the present invention is to provide a valve opening and closing mechanism of the automobile engine integrally formed with the spring seat and the valve stem seal in order to reduce the number of parts and to improve the assembly. do.

1 is a cross-sectional view showing a valve opening and closing mechanism of a typical automobile engine.

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

Figure 3 is an enlarged cross-sectional view showing the main portion of the present invention.

Explanation of symbols on the main parts of the drawings

2: Intake and exhaust port 3: Intake and exhaust valve

6: spring 7: spring retainer

9: Valve guide 11: Valve stem seal

12: spring seat portion 13: seat seal member

As a means for realizing the above object, the present invention guides the movement of the valve up and down, the valve stem seal coupled to the upper side of the valve guide to block the inflow of lubricating oil; It consists of the technical structure which is arrange | positioned opposing the spring retainer integrally attached to the rear end of the said valve, and the spring seat which the spring is carried between is formed in one body.

The seat seal member of the valve thus formed is inserted into and fixed to the upper end of the valve guide.

According to this configuration, the valve opening and closing mechanism of the present invention reduces the number of parts, improves the assembly with the valve guide, and improves the functional reliability of the spring seat and valve stem seal.

Hereinafter, preferred embodiments for realizing the present invention will be described in more detail with reference to the accompanying drawings.

EXAMPLE

2 is a cross-sectional view showing the entire valve opening and closing mechanism of the automobile engine according to the present embodiment, and FIG. 3 is an enlarged cross-sectional view showing the main part of the present embodiment.

In describing the present embodiment, the same reference numerals are used for the clarity of description for the configuration of the present embodiment that is the same as the drawings cited in the prior art.

In the drawings, reference numeral 1 denotes a cylinder head, and 3 denotes an intake and exhaust valve.

The intake / exhaust valve 3 slides up and down through the valve lifter 5 by rotation of a cam interlocked with the crankshaft when the engine is driven, thereby opening and closing the intake / exhaust port 2. The valve guide 9 for guiding the up and down movement of the intake and exhaust valves 3 is integrally inserted into the cylinder head 1.

Here, the valve stem seal part 11 of this embodiment is provided in the upper end part of the valve guide 9.

In addition, the spring seat part 12 of this embodiment is radially expanded around the valve guide 9, and is arrange | positioned facing the spring retainer 7 integrally attached to the rear end part of the valve 3.

The valve stem seal portion 11 and the spring seat portion 12 of this embodiment configured as described above are formed in one body to form the seat seal member 13, as can be seen from the drawings, and the seat seal member 13 is a valve. It is engaged by fitting from the upper end of the guide 9.

The spring 6 is supported between the spring seat portion 12 and the spring retainer 7 so that the spring retainer 7, that is, the valve 3, is always lifted upward.

According to the above-described configuration of the embodiment, the valve 3 slides while being in contact with the valve stem seal portion 12 of the valve guide 9 and the seat seal member 13 when moving up and down by driving of the engine. The intake and exhaust ports 2 are opened and closed.

At this time, the spring 6 supported by the spring seat portion 12 of the seat seal member 13 lifts the spring retainer 7 and returns the valve 3 lowered by the cam.

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

That is, according to the present invention, by forming the spring seat portion and the valve stem seal integrally, it is possible to obtain an effect of reducing the number of parts and improving the assemblability.

In addition, the integrated sheet seal member can obtain the effect that the reliability is improved.

On the other hand, the present invention is not limited to the above-described specific preferred embodiment, any person having ordinary knowledge in the field to which the subject innovation belongs without departing from the gist of the subject innovation claimed in the utility model registration claims Modifications may be made.

Claims (1)

A crankshaft rotated by the driving force of the engine, a camshaft and a cam interlocked with the crankshaft, an intake / exhaust valve sliding up and down along a valve guide fixed to the cylinder head in conjunction with the cam, A valve opening and closing mechanism of an automobile including a spring retainer which is carried by a spring so that the exhaust valve is always closed, a spring seat portion provided opposite to the spring retainer to support the other end of the spring, and an upper end of the valve guide. It is installed in the valve stem seal portion to prevent the flow of lubricating oil is formed in one body; Valve opening and closing mechanism of the vehicle, characterized in that coupled by fitting to the upper end of the valve guide.