KR19990003222U - Pistons for Internal Combustion Engines - Google Patents

Abstract

The present invention relates to a piston for reciprocating in a cylinder by receiving a gas pressure of a high temperature and high pressure in the expansion stroke of the engine, the reciprocating motion is transmitted to the connecting rod to rotate the crankshaft, in particular a ring groove of the piston (30) The end gaps 71A and 71B of the compression rings 70A and 70B and the end caps 81 of the oil ring 80 are sequentially opposite to each other at 33, 34, and 35, and the compression rings 70A and 70B and the oil are sequentially formed. By forming stoppers 33a, 34a, and 35a to prevent rotation of the ring 80, a useful design that can prevent the expansion gas from the combustion chamber from being released into the crankcase and the oil remaining in the cylinder wall from entering the combustion chamber to be.

Description

Pistons for Internal Combustion Engines

The present invention relates to a piston for reciprocating in a cylinder by receiving a gas pressure of a high temperature and high pressure in the expansion stroke of the engine, the reciprocating motion is transmitted to the connecting rod to rotate the crankshaft, in particular the upper and lower extrusion ring in the ring groove of the piston A stopper is formed to prevent rotation of the oil ring and the end gap of the upper and lower compression rings and the end gap of the oil ring sequentially opposite each other, so that the expansion gas of the combustion chamber is discharged into the crankcase and the oil is introduced into the combustion chamber. It relates to a piston for an internal combustion engine that can prevent the inflow.

In general, the operating principle of the engine, as shown in Figure 1, through the opening and closing valve 10, the intake of the mixture of air and fuel in the cylinder 20, compressed to the piston 30, and then ignition combustion, At the same time, a high temperature, high pressure expansion gas is generated, which causes the piston 30 to reciprocate linearly. And the movement of the piston 30 is transmitted to the connecting rod 50 connected to the piston pin 40 is converted into a rotational movement to rotate the crankshaft 60 connected to the connecting rod 50.

In the conventional piston, as shown in FIG. 2, a piston head 32 is formed on an upper portion of a skirt portion 31 that forms a boss 31a into which the piston pin 40 is inserted, and an outer circumference of the piston head 32. Has end gaps 71A and 71B and ring grooves 33 and 34 and end gaps 81 into which upper and lower compression rings 70A and 70B are inserted to prevent the expansion gas of the combustion chamber 21 from leaking. Excess oil is formed in the ring groove 35 into which the oil ring 80 is inserted, while forming ring grooves 35 into which the oil rings 80 are inserted to prevent oil from flowing into the combustion chamber 21. 30 is a configuration in which a plurality of drainage holes 36 to be discharged into the interior are formed.

Looking at the action of the conventional piston configured as described above, as shown in Figure 3, when the piston 30 is reciprocating linear movement in the stroke of the engine, the piston 30 moves up and down along the cylinder wall (20a) At this time, the upper and lower compression rings 70A and 70B and the oil ring 80 inserted into the ring grooves 33, 34 and 35 of the piston 30 also move together with the piston 30, and the upper and lower compression rings 70A and 70B. ) Keeps airtight so that the explosion gas in the combustion chamber 20a does not leak, the oil ring 80 leaves only an appropriate amount of oil in the cylinder wall (20a) to reduce friction with the cylinder wall (20a), the remaining oil Most of the oil is scraped off the cylinder wall 20a so as not to enter the combustion chamber 21 and discharged into the piston 30 through the drain port 80a of the oil ring 80. However, the reciprocating linear movement of the piston 30 causes a fine collision between the extrusion rings 70A and 70B, the oil ring 80 and the ring grooves 33, 34 and 35, and the fine collision is the upper and lower compression rings 70A and 70B. ) And the end gaps 71A and 71B of the upper and lower compression rings 70A and 70B and the end gaps 81 of the oil ring 80 are vertically aligned. At that moment, a gap occurs between the cylinder wall 20a and the compression rings 70A and 70B and the oil ring 80. Therefore, not only the expansion gas in the combustion chamber 21 flows out of the gap but also oil remaining in the cylinder wall 20a flows into the combustion chamber 22.

As described above, the conventional piston imparts a rotational force to the compression ring and the oil ring when the piston reciprocates linearly with the stroke of the engine, so that the gap between the cylinder wall and the compression ring when the end gap positions of the rotating compression ring and the oil ring coincide. As a result, the expansion gas in the combustion chamber not only flows into the crankcase, but also oil left in the cylinder wall to reduce friction with the cylinder wall is introduced into the combustion chamber.

In addition, the outflow of the expansion gas lowers the piston, the connecting rod, and the crankshaft movement, which are moved by pressure, and the oil introduced into the combustion chamber causes incomplete combustion in the combustion chamber and at the same time, a lack of lubricating oil. There is a problem.

The present invention was devised to solve the above problems of the prior art, by preventing the rotation of the extrusion ring and the oil ring in the ring groove of the piston as well as the end gap of the compression ring and the oil ring to the opposite direction, The purpose is to prevent the expansion gas of the combustion chamber from leaking into the crankcase and to prevent oil from the cylinder wall from entering the combustion chamber.

In order to achieve the above object, the present invention is a piston in which a ring groove into which a compression ring and an oil ring are inserted is formed on the outer circumference, and the piston ring groove has a compression ring and an end cap of the oil ring in a sequential direction opposite to each other. And a stopper for preventing rotation of the oil ring.

1 is a schematic diagram illustrating an operating principle of an engine.

2 is a perspective view of a conventional design.

Figure 3 is a sectional view of the main portion illustrating the operating state of the conventional design.

4 is a perspective view of the present invention.

Figure 5 is a sectional view of the main portion illustrating an operating state of the present invention.

* Description of the symbols for the main parts of the drawings *

10: closing valve 20: cylinder

30: piston 31: skirt part

31a: Boss 32: head

33, 34, 35, groove 33a, 34a, 35a: stopper

40: piston pin 50: connecting rod

60: crankshaft

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

In the description of the present invention, the same or equivalent parts as in the prior art will be described by referring to the same reference numerals.

Figure 4 is a perspective view of the piston of the present invention, Figure 5 is an enlarged cross-sectional view of the main portion illustrating an operating state of the present invention.

First, looking at the configuration of the present invention, the piston head 32 is formed on the upper portion of the skirt portion 31 formed with the boss 31a into which the piston pin 40 is inserted, but the combustion chamber on the outer periphery of the piston head 32 Oil is injected into the combustion chamber 21 and the upper and lower compression rings 70A and 70B having the end gaps 71A and 71B and the cylinder wall 20a so as to prevent the expansion gas of the 21 from leaking to the crankcase and to have elasticity. The oil ring 80 is inserted at the same time as the ring grooves 33, 34, 35 into which the oil rings 80 having the end gaps 81 are inserted to prevent the inflow into the shell and have elasticity. The ring groove 35 is formed with a plurality of drainage holes 36 for flowing excess oil into the piston 30. The ring grooves 33, 34, and 35 of the piston 30 prevent the rotation of the upper and lower compression rings 70A and 70B and the oil ring 80, and at the same time, the end gaps 71A and 70 of the upper and lower compression rings 70A and 70B. The stopper 33a, 34a, 35a which makes 71B) and the end cap 81 of the oil ring 80 mutually become the opposite direction is formed.

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

When the piston is reciprocating linearly by the stroke of the engine, the reciprocating linear movement of the piston 30 is carried out between the oil ring 80 and the ring groove 35 together with the extrusion rings 70A and 70B and the ring grooves 33 and 34. It causes a fine collision, the impact imparts a rotational force to the compression ring (70A, 70B) and the oil ring 80, while the rotational force of the upper and lower compression rings (70A, 70B) and the oil ring 80 is a ring groove ( It is extinguished by the respective stoppers 33a, 34a, 35a formed in the 33, 34, 35. That is, since the rotational advancing directions of the upper and lower compression rings 70A and 70B and the oil ring 80 that are rotated by the rotational force are blocked by the respective stoppers 33a, 34a, and 35a, the extrusion ring 70A, in which the rotational force is extinguished. 70B) and oil ring 80 do not rotate in ring grooves 33, 34, 35. In addition, the end gaps 81A and 71B of the upper and lower compression rings 70A and 70B fitted to the ring grooves 33, 34, and 35 and the end gaps 81 of the oil rings 80 are located in opposite directions, respectively. When the inflation gas in the 21 flows out through the end gap 71A of the upper compression ring 70A, the outflowed gas is blocked by the lower compression ring 70B and does not flow out, and if the engine gap of the lower compression ring 70B is Even though passing through 71B) it is blocked by the oil ring 80 and does not flow out. And when the oil remaining in the cylinder wall (20a) is introduced through the end gap of the lower compression ring (80), the oil does not flow in the same action as the expansion gas in the combustion chamber (21).

As described above, the present invention provides a stopper formed in the ring groove of the piston to prevent rotation of the extrusion ring while the end gaps of the compression rings are opposite to each other when the piston moves reciprocally in a linear stroke. There is an effect that can prevent the expansion gas of the combustion chamber to be released to the crankcase and the oil remaining on the cylinder wall into the combustion chamber.

Claims (1)

In the piston formed in the outer circumference of the ring grooves 33, 34, 35 into which the compression rings 70A, 70B and the oil ring 80 are inserted, In the ring grooves 33, 34, and 35, the end gaps 71A and 71B of the compression rings 70A and 70B and the end caps 81 of the oil ring 80 sequentially form mutually opposite directions, and the compression rings 70A and 70B) and a piston for an internal combustion engine, characterized by forming stoppers (33a, 34a, 35a) for preventing rotation of the oil ring (80).