KR19980075938A - Valve seat of engine - Google Patents

Abstract

The present invention relates to a valve seat of the engine, the opening and closing of the valve caused by the irregular acceleration and deceleration of the engine while driving the vehicle has an inertial force so that the inflow and outflow of the mixer and exhaust gas is not made accurately, the valve seat and the valve surface There was a problem that the contact is broken.

Therefore, the valve and the valve seat operating at a high temperature cannot achieve the optimized inflow of the mixed gas and the discharge of the exhaust gas due to poor adhesion due to deformation or burnout, thereby reducing the engine output.

Thus, the present invention is a ring-shaped fixed valve seat formed with a seating groove 26 in order to hold the spring 16 to absorb the impact of the opening and closing of the valve 14 as shown in Figure 2 to 3 ( 20 is inserted into the intake and exhaust ports 12 of the cylinder head 10, a ring-shaped flow valve seat 22 is inserted into the inner peripheral surface of the fixed valve seat 20, the combustion chamber and the port 12 Compression ring 18 is coupled to the outer circumferential surface of the flow valve seat 22 for hermetic action, and the impact force of the valve seat according to the opening and closing of the valve is buffered by the flow valve seat and the spring, thereby improving the airtightness of the valve seat and the valve. This has the effect of improving the performance of the engine.

Description

Valve seat of engine

The present invention relates to a valve seat of an engine, and more particularly, to an engine for relieving impact force so as to prevent burnout or deformation of a valve seat applied by an opening and closing action of a valve inleting a mixer and exhausting exhaust gas. It relates to a valve seat.

In general, the main body of the engine is a machine that generates power by converting thermal energy obtained from combustion of fuel into kinetic energy. Engines commonly used are divided into gasoline engine and diesel engine according to fuel, cylinder head, cylinder block, It is divided into three parts of the crankcase body, and its parts consist of stationary parts, motion parts and various accessories.

Here, the cylinder head, which is a stationary part, is equipped with an intake valve, an exhaust valve, and an ignition plug in a gasoline engine, and a fuel injection nozzle in a diesel engine. FIG. 1 shows fuel supply to a combustion chamber of an engine. Exemplary diagram expressing the structure of a valve driving mechanism for discharging combustion gas.

The valve driving mechanism is classified into an overhead valve type and an overhead camshaft type according to the configuration thereof, of which the overhead camshaft type is installed such that the camshaft 1 operates the timing gear at half the rotation speed of the crankshaft. The opening and closing timing of each valve with respect to the rotation of the crankshaft must be exactly matched, and the driving cam 2 is attached to each of the intake and exhaust camshafts 1 to open and close the intake and exhaust valves 3.

The valve 3 is a poppet valve used in an engine of an automobile, and the valve surface closely adhered to the valve head 4 and the valve seat 7 exposed to the high temperature and high pressure in the combustion chamber ( 5) and a valve guide (8) which consists of a stem (stem) 6 and the end of the stem, which discharge the heat of the valve head 4 to the cylinder head 9 through the valve guide 8.

Therefore, the valve 3 opens and closes the intake and exhaust ports of the combustion chamber by the rotation of the drive cam 2 in a very short time during one cycle of the piston, and serves to introduce the mixer and discharge the combustion gas. In the compression stroke and explosion stroke in which the intake and exhaust valves 3 are closed at the same time, the valve head 4 and the valve seat 7 should be in close contact with each other to maintain sufficient airtightness.

On the other hand, the valve seat 7 in close contact with the valve head 4 forms the shape of a ring pressed into the port of the cylinder head 9, and the valve seat 7 has a contact surface for airtightness of the valve face 5. Similar to the angle of the valve surface 5, the chamfers generally form a chamfer of 30 ° to 45 °, which is sufficient to be intact as it is exposed to hot gas and continues to impact the valve surface 5. It is made of heat-resistant steel with low thermal expansion coefficient.

As described above, the power stroke of the engine is made by the mechanical operation of a large number of components, and the precise operation between each component as well as the environment of the engine affects the output of the engine and the exhaust gas, which is an important issue in recent years. .

Thus, the intake and exhaust valves 3 of the engine parts are designed to be opened and closed at the correct time so that the intake of the mixer and the discharge of the combustion gas are achieved, and above all, the valve surface of the engine in the compression stroke and the explosion stroke. ) And the valve seat (7) is important.

However, the engine is irregularly accelerated and decelerated while the vehicle is running, and thus the valve 3 opened and closed by the driving cam 2 has an inertial force regardless of the engine speed, so that the inflow and outflow of the mixer and exhaust gas are precisely performed. There was a problem that the valve seat 7 is damaged due to contact with the valve face 5 while the valve 3 is opened and closed.

Therefore, the valve seat 7 which forms a contact surface with the valve 3 operating at high temperature cannot achieve the optimized inflow of the mixed gas and the discharge of the exhaust gas due to poor adhesion due to deformation or burnout, thereby reducing the engine output. It became a factor.

Accordingly, the present invention has been made to solve the problems of the prior art described above, the impact force is alleviated so as to prevent the burning or deformation of the valve seat applied by the opening and closing action of the valve to enter the mixer and discharge the exhaust gas It is an object of the present invention to provide a valve seat of an engine, which improves the performance of the engine.

In order to achieve the above object, the present invention inserts a fixed valve seat in which a seating groove is formed in order to inject a spring into an intake and exhaust port of a cylinder head, and flow valve seat moves up and down on an inner circumferential surface of the fixed valve seat. Insert the, but the outer circumferential surface of the flow valve seat is coupled to the compression ring, the edge portion is formed for hermetic contact with the valve.

Therefore, the present invention is to buffer the shock force of the continuous valve seat according to the opening and closing of the valve by the spring through the flow valve seat to absorb and prevent damage or damage to the valve seat and the valve to improve the performance of the engine.

1 is an exemplary diagram representing the structure of a valve driving mechanism of a conventional engine;

Figure 2 is a perspective cutaway representation of the valve seat of the engine according to the invention,

3 is a cylinder head equipped with a valve seat according to the present invention, (a) is a view when the valve is open, (b) is a view when the valve is closed.

-Explanation of symbols for the main parts of the drawings-

10-cylinder head, 12-port,

14-valve, 16-spring,

18-compression ring, 20-retaining valve seat,

22-flow valve seat, 24-corners,

26-seating groove.

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

According to the present invention, the ring-shaped fixed valve seat 20 in which the seating grooves 26 are formed to hold the spring 16 absorbing the shock of opening and closing of the valve 14 is intaken and exhausted from the cylinder head 10. Is inserted into the port 12, the ring-shaped flow valve seat 22 is inserted into the inner peripheral surface of the fixed valve seat 20, the outer peripheral surface of the flow valve seat 22 for the airtight action between the combustion chamber and the port 12 Is a valve seat of the engine to which the compression ring 18 is coupled.

Exemplary Drawing FIG. 2 is a cutaway perspective view of a valve seat of an engine according to the present invention, and is a device for absorbing an impact force according to opening and closing of a valve 14. A detailed description of the device is as follows.

The fixed valve seat 20 of the present invention for this purpose is a ring-shaped seating groove 26 is formed so that the spring 16 can be carried between the outer peripheral surface and the inner peripheral surface, the intake or exhaust port 14 of the cylinder head 10 ) Is firmly inserted.

In addition, the flow valve seat 22 is inserted into an inner circumferential surface of the fixed valve seat 20 in which the spring 16 is held in a ring shape, and a compression ring 18 is coupled to the outer circumferential surface of the flow valve seat 22. In addition, the fixed valve seat 20 and the flow valve seat 22 is made of a material with high wear resistance and heat resistance in consideration of the impact force with the valve 14 operating under high temperature and high pressure.

The valve seat of the present invention having such a configuration is mounted on the cylinder head 10 as shown in Figure 3 (a) is a view showing a state when the valve is opened, (b) is a state when the valve is closed The figure which shows.

The valve seat inserted into the cylinder head 10 opens and closes the valve 14 according to the intake stroke and exhaust stroke of the engine. As shown in the drawing, when the valve 14 is opened and there is gas inflow and outflow, the fixed valve seat 20 is provided. Due to the repulsive force of the spring 16 supported by the flow valve seat 22 is lowered to form a predetermined gap with the fixed valve seat (20).

On the other hand, in the airtight state in which the gas flow is blocked by closing the valve 14, the valve surface of the valve 14 presses the corner portion 24 of the valve seat, wherein the flow valve seat 22 is a spring 16 Will win the repulsion and rise.

Here, the compression ring 18 coupled to the outer circumferential surface of the flow valve seat 22 moves up and down while maintaining the airtightness with the inner circumferential surface of the fixed valve seat 20 to prevent airtightness between the intake or exhaust port 12 and the combustion chamber. It keeps working.

Therefore, the opening and closing operation of the valve 14 as described above imparts an impact to the contact surface of the valve seat while being continuously and irregularly opened according to the acceleration and deceleration of the engine. The flow valve seat 22 is provided by the spring 16 provided in the valve seat. It absorbs or mitigates the impact force applied to it.

As described above, the present invention inserts a spring-loaded fixed valve seat and a flow valve seat onto an intake port or an exhaust port on a cylinder head, and the impact force of the valve seat upon opening and closing the valve is applied to the spring through the flow valve seat. It has the effect of buffering and ultimately prevents burnout or damage of the valve seat and the valve, thereby improving the airtightness and improving the performance of the engine.

Claims (1)

A ring-shaped fixed valve seat 20 in which a seating groove 26 is formed to hold the spring 16 absorbing the impact of opening and closing the valve 14 is provided with an intake and exhaust port 12 of the cylinder head 10. And a ring-shaped flow valve seat 22 is inserted into the inner circumferential surface of the fixed valve seat 20, and a compression ring is provided on the outer circumferential surface of the flow valve seat 22 for an airtight action between the combustion chamber and the port 12. 18) valve seat of the engine, characterized in that coupled.