KR200153652Y1 - Cooling apparatus of piston for internal engine - Google Patents

Abstract

By spraying a portion of the oil supplied to the crankshaft to the piston inner wall to cool the piston, thereby extending the life of the piston; A crank mechanism comprising a piston of an internal combustion engine, a connecting rod, and a crank shaft, wherein the inner wall of the piston forms a spiral concave portion through which oil can flow, and is penetrated into the crank shaft to penetrate the pin journal and the main stirrer. Provided is a piston cooling device for an internal combustion engine formed by branching a main flow path formed to supply engine oil to a null from a balance weight portion, penetrating to an outer circumference of the balance weight, and communicating with a flow path for injecting oil to the upper side of the recess. .

Description

Piston chiller of internal combustion engine

1 is a cross-sectional view of a piston and a crank mechanism related thereto to which the present invention is applied.

2 is a cross-sectional view taken along the line A-A of FIG.

3 is an enlarged cross-sectional view of the crank flow path applied to the present invention.

* Explanation of symbols for main parts of the drawings

2: cylinder bore 4: piston

8: connecting rod 10: crankshaft

14: recessed part 16: jaw

22: main euro 24: balance weight

26: Euro

[Field of design]

The present invention relates to a piston cooling device of an internal combustion engine, and more particularly, by cooling a piston by ejecting a part of the oil supplied to the crankshaft to the piston inner wall, thereby cooling the piston of the internal combustion engine. Relates to a device.

[Private Technology]

As is well known, an internal combustion engine is an engine that converts chemical energy held by a mixer into thermal energy by combustion and converts the work when the combustion gas expands into mechanical energy as a crank mechanism. There is a number.

Looking at the internal configuration of such an internal combustion engine, as shown in FIG. 1, the piston 4 is mounted to be slidable up and down inside the cylinder bore 2; A connecting rod 8 whose upper end is connected to the piston 4 by a piston pin 6; It is made of a crankshaft 10 connected to the lower end of the connecting rod 8 to change the lifting movement of the piston 4 to the rotational movement.

In such an internal combustion engine, the piston 4 has its head portion exposed to the heat of combustion (approximately 2000 ° C. or more) of the mixer and subjected to high pressure (40 to 60 kg / cm 2), and has a high speed movement (about 20 m / s) in the cylinder. Because of this, up and down movement under bad conditions.

Accordingly, the piston can be fully functioned only by sufficient cooling. In the conventional internal combustion engine, the piston cooling is dependent only on the heat transfer of the piston ring interposed between the piston and the cylinder. There is a problem that the life of the piston is shortened.

Summary of the proposal

Therefore, the present invention was devised to solve the conventional problems as described above, an object of the present invention is to eject a portion of the oil supplied to the crankshaft to the piston inner wall to cool the piston, so as to extend the life of the piston It is to provide a piston cooling device for an internal combustion engine.

In order to realize this, the present invention is a crank mechanism including a piston of an internal combustion engine, a connecting rod and a crank shaft, and forms a spiral concave portion through which oil can flow in the inner wall of the piston, and penetrates into the crank shaft. And the main flow path formed to supply the engine oil to the pin journal and the main journal by branching at the balance weight portion and penetrating to the outer circumference of the balance weight to communicate with a flow path for injecting oil to the upper side of the recess. To provide a piston cooling device.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention capable of realizing the above object in detail as follows.

EXAMPLE

1 and 2 are internal configuration diagrams of an internal combustion engine to which the present invention is applied, and a piston (4) mounted slidably up and down inside a cylinder bore (2); A connecting rod 8 whose upper end is connected to the piston 4 by a piston pin 6; It is made of a crankshaft 10 connected to the lower end of the connecting rod 8 to change the lifting movement of the piston 4 to the rotational movement.

In the crank mechanism including the piston 4 of the internal combustion engine, the connecting rod 8 and the crankshaft 10, a spiral concave portion 14 is formed in the inner wall portion of the piston 4.

The helical recessed part 14 is formed from the upper side to the lower side of the inner wall portion of the piston 4, and the jaw 16 slightly protrudes upward from the lower side of the recessed part 14 so that the engine oil can flow down and down. ) Was formed.

Then, the main flow passage 22 formed to penetrate into the crankshaft 10 to supply the engine oil to the pin journal 18 and the main journal 20 branches from the balance weight 24 to balance the balance weight 24. Communication with the flow path 26 penetrating to the outer periphery of the ().

In the flow path 26, as shown in FIG. 3, the inner diameter portion D of the lower portion is large, and the inner diameter portion D of the upper portion is made small so that the injection may be performed by the rise of the hydraulic pressure at the upper end.

In addition, the flow path 26 is formed to be slightly inclined toward one side so that the balance weight 24 faces the upper end of the inner wall of the piston 4 in a position where the balance weight 24 is fully raised upward.

Accordingly, a part of the oil flowing through the main flow passage 22 of the crankshaft 10 is injected through the branch flow passage 26 in the process of operating the engine. At this time, the piston 2 in the state in which the balance weight 24 is set upward. Since is lowered to the bottom dead center is maintained closest to the state, the oil injected through the flow path 26 is injected to the uppermost side of the spiral concave portion 14 formed in the inner wall of the piston (2).

In this way, the oil injected into the upper portion of the spiral inlet portion 14 cools the piston 2 while flowing downward through the spiral inlet portion 14, and thus the cooling action of the piston 2 together with the piston ring 28. By doing so, the life of the piston is prevented from being shortened by heat.

As described above, according to the present invention, a simple structure is enough to cool the piston to improve the function of the piston, as well as a useful design that can extend the life.

Claims (3)

In a crank mechanism comprising a piston 4 of an internal combustion engine, a connecting rod 8 and a crankshaft 10, a spiral concave portion 14 so that oil can flow to an inner wall of the piston 4. And a main flow passage 22 branched from the balance weight 24 to penetrate the crankshaft 10 and supply the engine oil to the pin journal 18 and the main journal 20. In order to increase the oil ejection pressure above the concave portion 14 by penetrating to the outer circumference of the balance weight 24, the flow path 26 having the inner diameter portion d of the upper portion smaller than the inner diameter portion D of the lower portion is formed. Piston cooling device of the internal combustion engine, characterized in that formed. The helical recessed portion 14 is formed from the upper side to the lower side of the inner wall of the piston 4, and slightly upwards to the lower side of the recessed portion 14 so that the engine oil can flow downward. Piston cooling device of the internal combustion engine, characterized in that formed by forming a protruding jaw (16). 2. The piston cooling device according to claim 1, wherein the flow path (26) is slightly inclined toward one side so that the balance weight (24) faces the upper end of the inner wall of the piston (4) in a position where the balance weight (24) is fully raised upward.