KR20030039477A - Seal ring typed valve structure - Google Patents

Abstract

PURPOSE: A valve with a structure preventing partial side wear of a valve seat is provided to prevent partial side wear by compensating eccentricity. CONSTITUTION: A valve(1) includes an annular groove(6) formed on a valve face(5) facing a valve seat(4) in circumferential direction; a seal ring inserted to the annular groove to contact with the valve seat, and freely moving up and down and left and right; and a spring washer(8) accumulating dynamic stability when the seal ring moves, and supporting the seal ring to return the seal ring to an original position. When the valve is eccentric to a central axis(x-x) by distance l and inclined to the valve seat on one side, one part(7a) of the seal ring on the eccentric side contacts with the valve seat to be pushed to the other side. The other part(7b) of the seal ring is moved to an outside of the annular groove to contact with the valve seat. Horizontal and vertical movement of the seal ring is absorbed by the spring washer deformed. When the valve moves down, the seal ring returns to the original position by elastic restoring force of the valve seat.

Description

Valve having anti-abrasion structure of valve seat {Seal ring typed valve structure}

The present invention relates to the improvement of the structure of the valve for preventing uneven wear of the valve seat when opening and closing the intake and exhaust ports.

In a four-cycle engine, an intake valve and an exhaust valve are provided for each cylinder in order to introduce a mixer necessary for an expansion stroke into the combustion chamber and to discharge the combustion gas to the outside.

These intake and exhaust valves are easy to intake and exhaust during the very short period of one cycle of the piston to increase volumetric efficiency and to maintain sufficient air tightness in the combustion chamber in the compression and expansion strokes where both valves are closed and It must be able to meet the difficult conditions such as operating correctly even when exposed and withstanding long time operation.

However, since the valve 10 continuously contacts the inner wall surface of the intake and exhaust port 11 as shown in FIG. 3, the valve seat 12 having abrasion resistance in the port portion 11 is prevented to prevent wear. It is indented.

In this way, the valve seat 12 is in close contact with the valve face 13 to prevent leakage of the compressed gas during combustion. Hardness is necessary so that it does not occur.

However, even if the valve seat 12 is formed of a wear-resistant material, wear is promoted by other factors. Thus, the conventional valve 10, the valve guide (not shown), and the valve seat 12 may have different processing tolerances, assembly tolerances, and inclination differences. By eccentric ( ), The valve 10 is eccentrically contacted with the valve seat 12, a concentrated load occurs at the eccentric contact point, and uneven wear occurs.

The occurrence of uneven wear decreases the adhesion between the valve 10 and the valve seat 12, and reduces the compression ratio of the engine by degrading the air insulator function, thereby degrading engine performance.

In addition, when the valve mechanism is repaired due to uneven wear, all important parts of the engine must be dismantled. Therefore, in the current trend of increasing the warranty period of the vehicle, the maintenance cost of the manufacturer is increased. do.

Accordingly, the present invention has been proposed in view of the above-mentioned point, and an object thereof is to provide a valve for opening and closing the intake / exhaust port having a structure capable of compensating the amount of eccentricity so that the valve contacts the valve seat evenly without being eccentric. have.

In order to achieve the above object, the present invention provides a valve for contacting the valve seat pressed into the intake and exhaust port of the cylinder head to open and close the intake and exhaust port,

A ring recess formed in a circumferential direction on a valve face opposite to the valve seat;

A seal ring inserted into the ring recess to abut the valve seat and allowing up, down, left and right flows;

And a spring washer supporting the seal ring to return the seal ring to its original position by accumulating the restoring force therein during the flow of the seal ring.

1 is a view showing a valve having an anti-abrasion structure of the valve seat according to the present invention

2 is a view showing a valve operating structure when the valve of the present invention comes into eccentric contact with the valve seat;

3 is a view for explaining the prior art

※ Explanation of codes for main parts of drawing

1: Valve (intake, exhaust) 2: Cylinder head

3: port (intake and exhaust) 4: valve seat

5: valve face 6: groove space

7: sealing 8: spring washer

Eccentricity

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

1 is a view showing the valve structure for preventing wear of the valve seat according to the present invention, Figure 2 is a view showing the valve operating structure when the valve of the present invention in eccentric contact with the valve seat.

In the drawing, reference numeral 1 denotes a valve (intake and exhaust), reference numeral 2 denotes a cylinder head, and reference numeral 3 denotes a port (intake and exhaust) for introducing intake air or discharging exhaust gas.

The port 3 is press-fitted with a valve seat 4 made of a wear resistant small alloy, and the valve face 5 facing the valve seat 4 has a ring recess 6 along the circumference of the valve 1. ) Is formed.

In the ring groove 6, a seal ring 7 and a spring washer 8 are fitted.

The seal ring 7 has an inner diameter 9 of the seal ring 7 set larger than an inner diameter 10 of the ring groove 6 to allow left and right flow in the ring groove 6. The spring washer 8 supporting 7) has a block shape or a concave shape to the top to absorb the flow while being flattened when a force is applied due to the flow of the seal ring 8 in the vertical direction.

Such an eccentric amount absorption process of the valve according to the present invention will be described with reference to FIG.

Valve (1) distance from central axis (xx) When the eccentric side is pushed to one side valve seat, the sealing portion (7a, referred to as 7a for convenience) on the eccentric side is pushed to the other side while contacting the valve seat 4, so that the other side portion 7b of the sealing ring is for convenience. 7b) is pushed outward of the ring groove 6 to abut the valve seat 4, and the up, down, left and right flow of the seal ring is absorbed while the spring washer 8 is deformed. Will be.

When the valve 1 descends, the sealing ring 7 returns to its original position (initial state) by the elastic restoring force of the valve seat 8.

The present invention as described above is applied to the valve portion in contact with the valve seat so as to absorb the eccentric contact of the valve seat when the offset occurs between the valve and the central axis of the valve seat and the inclination between the central axis is different. By placing a ring groove and a seal ring that can flow up, down, left, and right in the ring groove, the eccentricity is absorbed by the processing and assembly errors, so that the sealing ring is in contact with the valve seat evenly. By preventing uneven wear, the durability of the valve system is increased, and maintenance costs for disassembling and disassembling the engine for frequent replacement of the valve are reduced.

Claims (4)

A valve for opening and closing an intake and exhaust port by contacting a valve seat pressed into an intake and exhaust port of a cylinder head, A ring recess formed in a circumferential direction on a valve face opposite to the valve seat; A seal ring inserted into the ring recess to abut the valve seat and allowing up, down, left and right flows; And a spring washer for supporting the seal ring to return the seal ring to its original position by accumulating restoring force therein when the seal ring is flowed therein. The method of claim 1, The inner diameter of the seal ring is a valve having an anti-abrasion structure of the valve seat, characterized in that larger than the inner diameter of the ring groove. The method of claim 2, The spring washer is a valve having an uneven wear structure of the valve seat, characterized in that the convex shape on the upper side. The method of claim 2, The spring washer is a valve having an uneven wear structure of the valve seat, characterized in that the concave shape to the lower side.