KR20030000157A - Damping apparatus for piston pin and snap ring - Google Patents

Abstract

PURPOSE: A damping device of a piston pin and a snap ring is provided to prevent the damage of the piston ring and the snap ring caused by the deflection when the piston is pressured by combustion explosion. CONSTITUTION: A piston pin(25) supports a connecting rod(26) inserted into the center of a piston(20), and is fitted into a pin hole(22). A first plate(31) is adjacent to both ends of the piston pin, and is contained in the pin hole. A second plate(32) has predetermined spaces from the outside of the first plate, and is contained in the pin hole. A spring(33) is interposed between the first plate and second plate. A snap ring(24) is fitted into a groove(23) to prevent the separation of the second plate.

Description

Damping apparatus for piston pins and snap rings

The present invention relates to a damping device of a piston pin and a snap ring, and more particularly, to a piston pin and a snap ring for preventing the piston pin and the snap ring from being damaged by deflection during the piston's combustion explosion pressure. It relates to a damping device.

In general, the piston pin connects the piston to the connecting rod, which transmits a large force applied by the piston to the crankshaft through the connecting rod, and simultaneously reciprocates with the piston at high speed in the cylinder. Therefore, just as the piston should be light, the piston pin itself is also required to be light and to withstand the large loads that vary frequently.

In addition, the surface of the piston pin is in contact with the piston or the bearing of the connecting rod, so wear resistance should be good. In consideration of this point, the material mainly uses carbon surface hardened steel or nickel chromium steel, and the surface is hardened to withstand wear, and the inside is not hardened to have toughness.

3 is a view illustrating a state in which a piston pin formed as described above is mounted on a piston, and a ring groove 11 for fitting a piston ring is formed at an upper outer circumference of the piston 10, and an intermediate portion thereof. The pin hole 12 penetrating to both sides is formed.

And the upper end of the connecting rod 13 is inserted into the center of the piston 10, the connecting rod 13 is axially supported by the piston pin 14 passing through the pin hole 12.

In addition, grooves are formed at both sides of the pin hole 12 at which both ends of the piston pin 14 are positioned to prevent the piston pin 14 from being deformed due to the combustion explosion force. Fitted with (16).

However, in the snap ring of the piston pin, the piston pin is deflected based on the groove of the piston pin hole in the process of deforming the piston pin under the combustion explosion pressure. Therefore, when the deflection is large, there is a problem that the snap ring is separated from the piston pin groove and excessively worn or broken.

Therefore, the present invention has been made in order to solve the above problems, a damping device of the piston pin and snap ring for preventing the piston pin and the snap ring from being damaged by the deflection in the process of receiving the piston explosion pressure. The purpose is to provide.

The present invention as a means for achieving the above object,

In the piston in which a pin hole for inserting the piston pin is formed, and grooves for inserting the snap ring to both sides of the pin hole are formed,

A piston pin fitted to the pin hole, the piston pin being inserted into the center of the piston;

A first plate accommodated in the pin hole in contact with both ends of the piston pin;

A second plate accommodated in the pin hole at a predetermined interval to the outside of the first plate;

A spring interposed between the first plate and the second plate;

A snap ring fitted to the groove to prevent the second plate from being separated; Characterized in that consists of.

1 is a cross-sectional view of a piston formed by the present invention.

2 is a block diagram of a damping device according to the present invention.

Figure 3 is a view for explaining the prior art.

※ Explanation of code for main part of drawing

20: piston 21: ring groove

22: pin hole 23: groove

24: snap ring 25: piston pin

26: connecting rod 30: damping device

31: first plate 32: second plate

33: spring

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

1 is a cross-sectional view of a piston formed by the present invention, Figure 2 is a block diagram of a damping device according to the present invention, the reference numeral 20 shown in the drawing indicates a piston formed by the present invention.

The piston 20 has a ring groove 21 for fitting the piston ring to the upper outer side as in the prior art, the pin hole 22 for the piston pin 25 is fitted in the middle portion of the piston 20. ) Is penetrated and formed.

And grooves 23 for fitting the snap ring 24 to prevent the piston pin 25 from being separated on both sides of the pin hole 22 is formed.

The piston pin 25 is inserted in the state where the upper end of the connecting rod 26 is inserted in the center of the piston 20 formed as described above, and the first plate 31 is provided on both sides of the piston pin 25. Is inserted into the pin hole 22 in the contact state.

In addition, a second plate 32 is inserted into the pin hole 22 at a predetermined distance from the first plate 31, and the spring between the first plate 31 and the second plate 32. (33) is interposed.

In order to prevent the second plate 32 from being separated from the pin hole 22, the snap rings 24 are fitted into the grooves 23 on both sides.

Referring to the operation of the present invention configured as described above are as follows.

When the engine is running, the piston is subjected to a high impact with high heat due to the combustion explosion. In this process, the piston 20 is moved up and down, and the connecting rod 26 is cam-driven, so that deflection is generated in the piston pin.

However, in the case of the piston 20 according to the present invention, the damping device 30 is provided on both sides of the piston pin 25 so that the force is attenuated on both sides of the piston pin 25 so that the piston pin 25 is deformed in an elliptical direction. It absorbs the deflection that is going to be.

In addition, by absorbing the deflection generated in the piston pin 25, the wear or deformation of the snap ring generated in the conventional piston is prevented, and the piston pin is prevented from being separated.

In addition, in the conventional case, a phenomenon in which the snap ring is separated by the deflection of the piston pin is generated. In the case of the snap ring 24 applied to the present invention, the damping device 30 is provided, and thus the phenomenon is separated. This prevents the wear of the snap ring 24 and improves the durability.

And since the movement of the piston pin 25 is buffered, the noise generated during the operation of the piston pin 25 is significantly reduced.

According to the present invention configured as described above, the piston pin is prevented from being deformed by deflection, and the snap ring is prevented from being separated by the deformation of the piston pin, so that the durability of the snap ring is improved, and the operation of the piston pin is improved. There is a big advantage in that the noise generated during operation is reduced by being buffered.

Claims (1)

In the piston in which a pin hole for inserting the piston pin is formed, and grooves for inserting the snap ring to both sides of the pin hole are formed, A piston pin 25 for bearing the connecting rod 26 inserted into the center of the piston 20 and fitted into the pin hole 22; A first plate (31) accommodated in the pin hole (22) in contact with both ends of the piston pin (25); A second plate 32 accommodated in the pin hole 22 at a predetermined interval to the outside of the first plate 31; A spring 33 interposed between the first plate 31 and the second plate 32; A snap ring 24 fitted to the groove 23 to prevent the second plate 32 from being separated; Damping device of the piston pin and the snap ring, characterized in that consisting of.