KR19990032833U - Pistons of car engine - Google Patents

Abstract

The present invention forms an accommodating groove at the lower periphery of the piston, and then inserts a steel ring pressurized by a spring and an elastic rubber into the accommodating groove to block the inflow of foreign substances from the crank chamber through the cylinder wall surface, thereby preventing the piston and the piston ring. The present invention relates to a piston of a vehicle engine that can prevent damage to the piston, which is stored in a receiving groove (6a) formed on the outer circumferential surface of the lower portion of the steel ring (30) to prevent the rise of foreign matter coming up the cylinder wall surface, and the steel ring The steel ring 30 has a structure including an elastic rubber 32 which is held in close contact with the cylinder wall by being inserted into the receiving groove 6a while being fitted inside the 30.

Description

Pistons of car engine

The present invention relates to a piston of a vehicle engine, and more particularly, to form a receiving groove in the outer peripheral portion of the lower end of the piston, and then inserts a steel ring pressurized by the spring and the elastic rubber into the storage groove to ride on the cylinder wall surface The present invention relates to a piston for a vehicle engine that can prevent damage to the piston and the piston ring by blocking the inflow of foreign substances from the seal.

When the components of an automobile engine are roughly classified, a cylinder block is formed as a part constituting the engine main body, and a plurality of cylinders are integrally formed, and a water jacket is formed between each cylinder and a coolant flows therebetween. It is a part arranged in the upper part and forming a combustion chamber with a piston, Comprising: It consists of the cylinder head in which various valve mechanisms, a spark plug, an injection valve, etc. are installed, and the crank case in which a crank shaft is provided.

1 is a perspective view showing a cross-sectional view of a part of a conventional automotive engine, a piston which moves up and down along a wall of a cylinder by a rotational force of a crankshaft transmitted through a connecting rod in a cylinder integrally formed in the cylinder block 2. (6) is provided. The combustion chamber provided by the cylinder head 4 and the head of the piston 6 is supplied with air introduced through the intake port 4a, and after combustion, the exhaust gas is discharged to the exhaust pipe through the exhaust port 4b. . In addition, water jackets 2a and 4c through which coolant flows are formed in the cylinder block 2 and the cylinder head 4 to prevent overheating of the engine. A cylinder head gasket 28 for airtightness is fitted between the cylinder block 2 and the cylinder head 4.

Here, two compression rings 8 are fitted to the piston 6 to maintain the airtight between the piston and the cylinder wall, and transfer heat of the piston 6 to the cylinder wall surface. An oil ring 10 is fitted in the lower portion of the compression ring 8 to scrape off excess oil raised along the cylinder wall and return it to the oil pan.

The air sucked through the intake pipe is mixed with the fuel injected from the injection valve to form a mixer, and then supplied to the combustion chamber at the time of opening of the intake valve 12, and the burned exhaust gas is opened at the time of opening of the exhaust valve 22. Discharged. The intake valve 12 and the exhaust valve 22 provided in the cylinder head 4 are mounted in the pressurized state by the springs 14 and 24, respectively, and these valves 12 and 22 are attached to the camshaft 18, respectively. The intake port 4a and the exhaust port 4b are selectively opened while being moved up and down by the rocker arms 16 and 26 driven by it.

In the piston of a conventional vehicle engine having such a configuration, foreign substances that have risen from the crank chamber on which the crank shaft is mounted on the wall of the cylinder flow into the gap between the outer surface of the piston and the inner wall of the cylinder, and are transferred to the oil ring when the piston descends. By entering and damaging it, there is a problem in that oil is introduced into the combustion chamber and engine oil is consumed. In addition, the foreign matter introduced into the gap scratches the outer surface of the piston, the compression force is reduced.

The present invention devised to solve such a problem forms a receiving groove on the outer circumferential surface of the cut constituting the lower part of the piston, and then inserts a steel ring in the receiving groove to block the inflow of the engine of the vehicle engine. The purpose is to provide.

1 is a cross-sectional view showing the configuration of a conventional vehicle engine,

2 is a cross-sectional view showing the configuration of a vehicle engine according to the present invention;

Figure 3 is an exploded perspective view showing the configuration of the steel ring and the elastic rubber according to the present invention.

♣ Explanation of symbols for main part of drawing ♣

2: cylinder block 4: cylinder head

6: Piston 6a: Storage groove

12, 14: intake, exhaust valve 8: compression ring

10: oiling 30: steel

32: Elastic rubber 32a: Mounting groove

It is a spring 34

An object of the present invention as described above, in the piston of a vehicle engine for compressing the mixer while sliding up and down along the inner wall of the cylinder formed in the cylinder block by the rotational force of the crankshaft transmitted through the connecting rod, the storage formed on the outer peripheral surface of the lower end of the piston Steel ring that is stored in the groove and prevents the foreign material from rising on the cylinder wall, and elastic rubber that is inserted into the receiving groove while being elastically pressurized while being inserted inside the steel ring to maintain the steel ring in close contact with the cylinder wall. It is achieved by a piston of a vehicle engine comprising a.

Hereinafter, with reference to the accompanying Figures 2 and 3 will be described in detail with respect to the piston of the vehicle engine according to a preferred embodiment of the present invention. (The same components as the conventional structure described in Figure 1 are denoted by the same reference numerals.)

Figure 2 is a cross-sectional view showing the configuration of the vehicle engine according to the present invention, Figure 3 is an exploded perspective view showing the configuration of the steel ring and the elastic rubber according to the present invention.

As described in FIG. 1, in the cylinder integrally formed in the cylinder block 2, a piston 6 that moves up and down along the wall surface of the cylinder is provided by the rotational force of the crankshaft transmitted through the connecting rod. In addition, two compression rings 8 are fitted in the piston 6 to maintain the airtight between the piston 6 and the cylinder wall surface, and transfer heat of the piston 6 to the cylinder wall surface. An oil ring 10 is fitted in the lower portion of the compression ring 8 to scrape off excess oil raised along the cylinder wall and return it to the oil pan.

In the piston (6) having such a configuration, as a way to block the inflow of foreign substances from the crank chamber to the cylinder wall surface, in the preferred embodiment of the present invention the receiving groove (6a) in the outer peripheral surface of the lower end of the piston (6) After forming, the steel ring 30 was accommodated in the receiving groove 6a.

As shown in part in cross section in FIG. 2, an elastic rubber 32 is coupled to an inner side of the steel ring 30 accommodated in the accommodation groove 6a, and a spring 34 is formed inside the elastic rubber 32. ) Is inserted. In order to more clearly show their assembling process, each component is shown separately in FIG.

As shown in FIG. 3, a storage groove 6a is formed in the lower outer circumferential surface of the piston 6, and the steel ring 30 and the elastic rubber 32 are inserted in this storage groove 6a in turn. . Here, the steel ring 30 is inserted into the inner peripheral surface of the elastic rubber (32). A mounting groove 32a is formed in the inner circumferential surface of the elastic rubber 32, and the spring 34 is fitted into the mounting groove 32a.

Therefore, the steel ring 30 maintains the state in close contact with the cylinder wall surface by the pressing force of the elastic rubber 32 and the spring 34, and thickens the foreign matter that has risen on the cylinder wall surface as the piston 6 moves up and down. It plays a role of getting off.

According to the present invention described above, since the steel ring is accommodated in the state that is elastically pressurized by the spring and the elastic rubber in the receiving groove formed on the outer peripheral surface of the cut constituting the lower part of the piston, the foreign matter on the wall surface of the cylinder There is an advantage that can block the inflow of.

Claims (2)

In the piston of a vehicle engine compressing the mixer while sliding up and down along the inner wall of the cylinder formed in the cylinder block 2 by the rotational force of the crankshaft transmitted through the connecting rod, A steel ring 30 which is accommodated in the receiving groove 6a formed on the outer peripheral surface of the lower end of the piston 6 to prevent the foreign material from rising on the cylinder wall; The elastic ring 32 is inserted into the receiving groove 6a in a state of being fitted inside the steel ring 30 to elastically pressurize the steel ring 30 to maintain the state in which the steel ring 30 is in close contact with the cylinder wall surface. Piston of engine for vehicle. The method of claim 1, The piston of the vehicle engine, characterized in that the mounting groove (32a) formed on the inner peripheral surface of the elastic rubber (32) is fitted with a spring (34) for providing an elastic force to the elastic rubber (32).