KR200373244Y1 - Piston Ring for Combustion Visual Apparatus of Internal Combustion Engine - Google Patents

Abstract

The present invention relates to a piston ring installed to seal the combustion chamber between a cylinder and a piston installed in an apparatus for visualizing a combustion state in an internal combustion engine combustion chamber. Compression ring (7) contacting the inner wall of the cylinder (1) in the state in which one side is accommodated in the plurality of grooves (11) formed along the circumferential direction, and arranged in contact with the inner portion of the compression ring (7) in the groove (11) And an elastic ring 9 which presses the compression ring 7 against the inner wall of the cylinder 1. According to the piston ring according to the present invention, the endurance life of the compression ring in friction contact with the cylinder inner wall can be extended and the airtightness of the combustion chamber can be improved.

Description

Piston ring for internal combustion engine visualizer {Piston Ring for Combustion Visual Apparatus of Internal Combustion Engine}

The present invention relates to an internal combustion engine combustion visualization apparatus, and more particularly, to a piston ring for maintaining the airtightness of the combustion chamber in the internal combustion engine combustion visualization apparatus.

In general, the flame propagation speed and propagation characteristics in the combustion chamber of an internal combustion engine are very important for identifying knocking occurrence, and accurate measurement of the flame propagation speed is necessary to realize complete combustion.

Therefore, in designing an internal combustion engine, an apparatus capable of visualizing the flame flow in an internal combustion engine combustion chamber has been developed in order to observe the flow and explosion and flame propagation characteristics of the mixer in the combustion chamber.

The apparatus is equipped with a plurality of piston rings on the outer periphery of the piston to maintain airtightness in the combustion chamber. In the piston ring mainly used in the apparatus, since the apparatus must be operated in a non-lubricated state in which lubricating oil is not supplied, Rulon, etc., which is a special material, which is not steel, is usually used. However, such a piston ring of Rulon has a problem in that the durability of the material itself has a limit that must be frequently replaced to maintain the airtightness of the combustion chamber.

Accordingly, the present invention has been made in view of the above problems, and provides a piston ring of an internal combustion engine combustion visualization device to improve the airtightness of the combustion chamber by improving the structure of the piston ring mounted on the piston of the internal combustion engine combustion visualization device. Its purpose is to.

One embodiment of the piston according to the present invention for achieving the above object, in the piston ring is installed to seal the combustion chamber between the piston and the cylinder installed in the apparatus for visualizing the combustion state in the internal combustion engine combustion chamber, A compression ring contacting the inner wall of the cylinder in one of the plurality of grooves formed along the circumferential direction on the outer surface of the piston in contact with the inner wall of the cylinder and in contact with the inner side of the compression ring and the compression ring toward the inner wall of the cylinder. It is characterized by consisting of an elastic ring to be in pressure contact.

In addition, as another embodiment of the piston ring according to the present invention, a groove for accommodating an outer portion of the elastic ring is formed in the inner portion of the compression ring can be arranged in a state in which the compression ring and the elastic ring in surface contact with each other in the groove of the piston. .

1 is a cross-sectional view showing an embodiment of a piston ring according to the present invention when the piston is mounted in the cylinder in the combustion visualization device of the internal combustion engine.

Figure 2 is a sectional view showing another embodiment of the piston ring according to the present invention.

3 is a partially enlarged cross-sectional view for explaining the sealing principle of the piston ring of the present invention shown in FIG.

Explanation of symbols on the main parts of the drawings

1: cylinder

3: piston

5: combustion chamber

7: compression ring

9: elastic ring

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the piston ring used in the internal combustion engine combustion visualization device according to the present invention.

1 is a cross-sectional view showing an embodiment of a piston ring according to the present invention when the piston is mounted in the cylinder in the combustion visualization device of the internal combustion engine.

Referring to Fig. 1, the piston ring of the present invention, which is installed to seal the combustion chamber 5 between the cylinder 1 and the piston 3 installed in the apparatus for visualizing the combustion state in the combustion chamber of the internal combustion engine, has a compression ring (7). ) And an elastic ring (9).

The compression ring 7 contacts the inner wall of the cylinder 1 in a state where one side thereof is accommodated in a plurality of grooves 11 formed along the circumferential direction on the outer surface of the piston 3. The material of the compression ring 7 is preferably rulon, teflon, polyamide, or the like.

The elastic ring 9 is arranged to contact the inner side of the compression ring 7 in the recess 11 of the piston 3 and pressurizes the compression ring 7 toward the inner wall of the cylinder 1. As the elastic ring 9, a conventional O-ring or the like having a cross section which responds with elastic force against pressure from the outside is preferable.

On the other hand, Figure 2 is a cross-sectional view showing another embodiment of the piston ring according to the present invention.

2, a concave groove 7a is formed in the inner side of the compression ring 7 to receive the outer portion of the elastic ring 9 so that the compression ring 7 and the elastic ring in the groove 11 of the piston 3 are formed. 9) are arranged to be in surface contact with each other.

This configuration increases the contact area between the compression ring 7 and the elastic ring 9 in the recess 11 of the piston 3 as compared to FIG. 1 to provide a stable coupling structure.

In more detail with reference to FIG. 3, when the piston 3 rises and compresses the combustion chamber, a combustion chamber internal pressure is formed in the combustion chamber, and the combustion chamber internal pressure is obtained through the air between the piston 3 and the cylinder 1. The compressive force Fp is transmitted to the groove 11 of (3) to compress the compression ring 7 and the elastic ring 9. By the compression force Fp, the elastic ring 9 is deformed to generate an outward force Fh, and the force Fh is sealed around the elastic ring 9 so that combustion gas does not leak. Further, the force Fh in the outward direction generates a piston ring tension Ft acting on the inner wall surface of the cylinder 1 by the compression ring 7, thereby forming a gap between the compression ring 7 and the inner wall surface of the cylinder 1. Seal. At this time, the piston ring tension (Ft) is represented by the following equation (1).

Where FT is the tension of the piston ring, Fp is the combustion chamber compression force, and d is the diameter of the elastic ring 9.

According to the present invention configured as described above, due to the elasticity of the elastic ring 9, the compression ring 7 is in close contact with the inner wall of the cylinder 1, there is an advantage that the airtightness of the combustion chamber 5 is further improved.

In addition, due to the limited endurance life of the material of the compression ring 7 itself, if the compression ring 7 ages, it must be replaced to maintain the airtightness of the combustion chamber 5. However, according to the constitution according to the present invention, even if the compression ring (7) is deteriorated and the airtight performance of the combustion chamber (5) is deteriorated, the elastic force of the elastic ring (9) serves to reinforce such that the airtight performance is kept constant, As a result, the replacement timing of the compression ring 7 is extended.

While the invention described above has been described as preferred embodiments, it is to be understood that other embodiments may be derived from this description by changes in size, shape, material and substitution of parts without departing from the spirit thereof. will be.

As described above, according to the piston ring of the internal combustion engine combustion visualization device according to the present invention, the piston ring mounted on the piston of the internal combustion engine combustion visualization device is composed of a compression ring and an elastic ring to extend the endurance life of the compression ring and to ensure the airtightness of the combustion chamber. It has an improved effect.

Claims (2)

In the piston ring provided to seal the combustion chamber between the cylinder and the piston provided in the apparatus for visualizing the combustion state in the combustion chamber of the internal combustion engine, A compression ring contacting the inner wall of the cylinder in a state in which one side is accommodated in a plurality of grooves formed along the circumferential direction on the outer surface of the piston and in contact with the inner side of the compression ring in the groove, A piston ring of an internal combustion engine combustion visualizing device, characterized in that it comprises an elastic ring for pressure contact. The internal combustion engine according to claim 1, wherein a groove for accommodating an outer portion of the elastic ring is formed at an inner side of the compression ring such that the compression ring and the elastic ring are arranged in surface contact with each other in the groove of the piston. Piston ring of combustion visualization device.