KR20130004957A

KR20130004957A - Piston cooling device

Info

Publication number: KR20130004957A
Application number: KR1020110066202A
Authority: KR
Inventors: 이재혁; 류영석; 정성수
Original assignee: 현대중공업 주식회사
Priority date: 2011-07-05
Filing date: 2011-07-05
Publication date: 2013-01-15

Abstract

The present invention relates to a piston cooling device, the object of which is to automatically set the opening and closing time, supply pressure and supply amount according to the pressure of the cooling oil, and above all, a valve having a straight opening and closing flow path that can improve the control responsiveness of opening and closing time It is to provide a direct injection piston cooling apparatus that can always spray a stable and sufficient amount of cooling oil toward the piston by means.
To this end, the present invention forms an inlet communicating with the cooling oil gallery formed in the cylinder block on one side, the body is fixedly coupled to the cylinder block so that the other outlet connected to the inlet through the inner passage toward the bottom of the piston; It is installed in the inner passage between the inlet and the outlet of the body, the plunger opening and closing means for supplying the cooling oil toward the other outlet by opening the inner passage only when the cooling oil flowing into the inlet is above a certain pressure; And a nozzle coupled to an outlet of the body, the nozzle comprising a nozzle for injecting cooling oil passing through a channel formed therein.

Description

Piston cooling device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston cooling device, and more particularly, to a piston cooling device for injecting oil directly toward a piston bottom to a high speed internal combustion engine to achieve a cooling action.

When the engine is running, the piston is heated by the friction of the cylinder and the heat of combustion.If the heated piston is not cooled, abnormal piston wear occurs due to increased thermal fatigue stress and sintering of the piston ring, which in turn increases oil consumption. Not only that, but in severe cases, it can lead to engine deterioration and failure.

To this end, the engine is provided with a piston cooling device that can inject (spray) oil into the piston during operation of the engine.

Often the piston cooling device is fixedly coupled to the cylinder block so as to contact the oil gallery formed in the cylinder block, and the piston cooling device thus fixed is placed at the bottom of the piston so that the nozzle outlet is disposed toward the bottom of the piston. .

The piston cooling device receives the oil flowing into the oil gallery of the cylinder block by the operation of the external oil pump and sprays the oil intermittently or continuously at the time when the piston descends to the bottom dead center, thereby cooling the piston. .

1 shows an example of a conventional piston cooling device.

Referring to FIG. 1, the conventional piston cooling device includes a body 5 in which a cooling oil gallery 2a formed in a cylinder block 2 and an inner passage 51 are fixedly connected to each other, and the body 5. A nozzle 7 coupled to the other side of the nozzle 7 for injecting cooling oil passing through the channel 71 formed therein, and installed in the inner passage 51 of the body 5 to pass through the inner passage 51 of the cooling oil. It consists of valve means 6 which open and close.

As shown in the drawing, the conventional piston cooling device uses a valve 61 which is spring-supported in the opposite direction of the cooling oil passing through the inner passage 51 of the body 5, whereby the cooling oil flowing into the body 5 is always Only when it is above a certain pressure, the structure supplied to the piston (not shown) through the other nozzle 7 is satisfied.

However, in the conventional piston cooling device, the valve 61 is opened and cooled toward the other nozzle 7 only when the pressure of the cooling oil flowing into the body 5 is equal to or higher than the set pressure (pressure that overcomes the spring supporting force of the valve). Although the basic structure for injecting the oil is achieved, the conventional valve means 6, the injection pressure supplied to the piston through the nozzle (7) does not ensure the correct supply pressure corresponding to the set pressure.

That is, when a high pressure is formed so that the cooling oil flowing from the body 5 can overcome the bearing force of the spring supporting the valve 61, the valve 61 overcomes the bearing force of the spring and moves in the opposite direction. In this case, the valve 61 is initially opened partially instead of being fully open at a moment. As a result, even when the cooling oil is supplied at the set pressure for overcoming the spring bearing force of the valve 61, the pressure of the cooling oil through the nozzle 7 is substantially lower than the set pressure even when the valve 61 is not fully opened. There is a problem in that it is difficult to control to secure the correct set pressure such as to maintain the state.

In other words, the valve means 6 provided in the conventional piston cooling device is full open of the valve 61 due to the pressure loss generated at the initial opening of the valve 61 for converting the flow of cooling oil in the vertical direction. ), The cooling oil is not injected by the sufficient amount and pressure of the cooling oil through the nozzle (7), or the supply pressure sufficiently high through the oil pump in consideration of the partial opening condition of the valve (61) Even though the cooling oil is supplied by the air, the pressure of the cooling oil supplied to the nozzle 7 is severe at the initial opening point before the valve 61 is fully opened, so that the supply pressure and the supply amount of the cooling oil are immediately and precisely controlled. There was an impossible problem.

On the other hand, in general, the injection condition of the cooling oil injected through the nozzle 7 is determined by the pressure and the amount of the cooling oil passing through the valve means 6 as described above of the piston cooling device and finally the nozzle 7 The injection amount, injection timing, and injection area of the final cooling oil are determined from the structural shape of the channel 71 formed therein.

As a result, when the cooling oil injected through the nozzle 7 cannot be injected at a sufficient pressure and amount, the sufficient amount and straightness of the injected cooling oil cannot be secured, so that the cooling oil is not accurately injected toward the piston and falls into an oil tank. It reduces the cooling action of the piston and increases the consumption of cooling oil.

Accordingly, the present invention is to solve the conventional problems as described above, the object of the present invention is to provide an oil direct injection type cooling device for the piston that does not require the processing passage of the cooling oil toward the piston in the other parts, such as the connecting rod basically. Is in.

Another object of the present invention, by using a plunger opening and closing means for securing a straight flow path of the cooling oil in accordance with the set pressure piston cooling device excellent in opening and closing responsiveness capable of maintaining a stable supply of cooling oil injection supply stably and quickly and accurately In providing.

Still another object of the present invention is to provide a piston cooling device that can reduce unnecessary consumption of cooling oil by opening and closing a flow path only when cooling oil is introduced at a pressure equal to or higher than a pressure set using a plunger structure.

It is another object of the present invention to propose a channel of an outlet nozzle for injecting cooling oil past a plunger opening and closing means having a straight flow path of cooling oil to satisfy the linearity and optimum supply amount of the cooling oil finally injected toward the piston. It is to provide a piston cooling device that can reduce the cooling action of the piston and unnecessary oil consumption.

The present invention for achieving the above object is to form an inlet in communication with the cooling oil gallery formed on the cylinder block on one side, the other outlet connected to the inlet through the inner passage toward the bottom of the piston A body fixedly coupled to the body;

It is installed in the inner passage between the inlet and the outlet of the body, the plunger opening and closing means for supplying the cooling oil toward the other outlet by opening the inner passage only when the cooling oil flowing into the inlet is above a certain pressure; And

It is coupled to the outlet of the body, characterized in that it comprises a nozzle for injecting cooling oil passing through the channel formed therein.

At this time, the plunger opening and closing means, the spring support is installed on the engaging jaw formed on the inner surface of the inner passage of the body, and forms a cooling oil outlet hole in the center; A valve which is elastically supported toward the inlet of the body by a spring from the spring support; Forming a cooling oil inlet hole in the center, the valve support is coupled to the inner surface of the inner passage of the body in a compressed state by pressing the valve in close contact; may be configured.

In addition, the valve support may be configured to be screwed to the inner passage inner surface of the body, it may be configured to adjust the elastic support force of the spring for supporting the valve according to the screw tightening degree of the valve support.

From the above means, the present invention is a direct injection cooling device for cooling oil toward the bottom of the piston, structurally simple and easy to manufacture without the need to form an internal oil supply flow path leading to the piston inside the existing connecting rod There is an advantage to providing a chiller.

In addition, the present invention can realize a full open state of the valve immediately due to the plunger opening and closing means for securing a straight flow path of the cooling oil passing through the opening and closing means and at the same time responds to the set pressure (pressure to overcome the spring holding force) at the time of opening the valve. Therefore, the supply pressure (supply amount) of the cooling oil can be controlled quickly and accurately, so that the cooling action of the piston can be performed more efficiently and the cooling performance of the piston can be improved.

In addition, the present invention can freely and finely change the elasticity of the spring supporting the valve by adjusting the position of the valve support coupled to the body and the screw, so that the cooling oil regardless of the operating conditions of the engine and the operating pressure of the oil pump Injection timing, supply pressure and the amount of supply has the advantage that can be precisely adjusted freely.

In addition, the present invention can maintain the straightness and stable supply of the cooling oil injected by maintaining the length / diameter ratio of the channel formed in the outlet nozzle to a certain level or more to further improve the cooling performance of the piston and There is an advantage that can reduce unnecessary consumption.

1 is an example of a conventional piston cooling device.
2 is a view showing the configuration of a piston cooling device according to the present invention.
3 is a view for showing an open state of the piston cooling device according to the present invention.
4 is a view showing a configuration for adjusting the opening and closing set pressure of the piston cooling device according to the present invention.
5 is a view for showing the outlet nozzle configuration of the piston cooling apparatus according to the present invention.

Features and effects of the present invention described above or not will become more apparent through the embodiments of the present invention with reference to the accompanying drawings.

2 to 5 is a view showing the configuration of a piston cooling device according to the present invention.

Referring to FIG. 2, the piston cooling device 1 according to the present invention is fixedly coupled to the cylinder block 2 so as to be in contact with the oil gallery 2a formed in the cylinder block 2, and thus, the inside of the cylinder block 2. Protruding end is located at the bottom of the piston (not shown).

In detail, the piston cooling device 1 in the present invention comprises a body 10, a plunger opening and closing means 20, the nozzle 30.

The body 10 is fixed to the cylinder block (2), the inlet (11) communicating with the cooling oil gallery (2a) formed in the cylinder block (2) is formed on one side, through the inner passage (13) An outlet 12 connected to the inlet 11 is formed on the other side and configured to face the bottom of the piston.

And preferably, the body 10 is inclined downward from the center predetermined portion so that the nozzle 30 coupled to the outlet 12 can avoid the interference with the driving component such as the connecting rod and can be directed exactly to the center of the bottom surface of the piston. It is good to configure to form an inclined structure.

Reference numeral '15' is a 'cap member' covering both ends of the body (10).

The plunger opening and closing means 20 opens the inner passage 13 of the body 10 only when the supply pressure of the cooling oil flowing into the inlet 11 of the body 10 exceeds a predetermined pressure, thereby leaving the other outlet. In order to supply cooling oil to 12, it is installed on the inner passage 13 between the inlet 11 and the outlet 12 of the body 10. As shown in FIG.

At this time, the plunger opening and closing means 20 according to the present invention is to ensure a straight opening and closing passage parallel to the straight inner passage 13 leading from the inlet 11 of the body 10 to the other outlet 12, When the plunger opening and closing means 20 is opened, the linear flow path of the cooling oil along the inner passage 13 is satisfied.

In detail, the plunger opening and closing means 20 includes a spring support 21, a spring 22, a valve 23, and a valve support 24.

The spring support 21 is fitted into the inner passage 13 of the body 10 to be seated on the engaging jaw 210 formed on the inner surface of the inner passage 13 to maintain the correct position, the inner passage in the center An outlet hole 211 capable of communicating 13 is formed and provided.

The spring 22 forms a coil spring structure that is fitted to the spring support 21, and the valve 22 is tightly supported on the other side while one side is supported by the spring support 21.

The valve 23 has a ball shape, is pressed against the other valve support 24 by the elastic force of the spring 22, and has a diameter smaller than the diameter of the inner passage 13 of the body 10. It is formed to have to form a flow path of the cooling oil through the gap due to this diameter difference.

The valve support 24 supports the opposite side of the valve 23 on the opposite side of the spring 22, and is fixed by the inner surface of the inner passage 13 of the body 10 and the screw fastening portion 245. It is coupled to the inner passage 13 connected to the inlet 11 of the body 10 is provided with an inlet hole 241 to be communicated to one side of the valve (23).

Briefly explaining the installation process of such a plunger opening and closing means 20, first open the cap 15 coupled to one side of the body 10, inserting the spring support 21 into the inner passage 13 into the inner passage It is supported by the locking jaw 210 formed in (13), and then the spring 22 and the valve 23 is inserted in turn, and finally the valve support 24 is inserted to screw the inner passage 13 It is fixed but screwed to a position that can press the valve 23 to compress the spring 22 to a predetermined pressing force to be fixed. As a result, the valve support 24, the valve 23, the spring 22, and the spring support 21 are sequentially installed along the flow direction of the cooling oil passing through the inner passage 13 of the body 10.

Subsequently, the nozzle 30 sprays (sprays) the cooling oil supplied to the outlet 12 along the inner passage 13 of the body 10 through the plunger opening and closing means 20 toward the bottom of the piston. Will be performed.

The nozzle 30 forms a channel 31 having a predetermined shape therein, and the cooling oil discharged through the channel 31 is sprayed (sprayed) while satisfying a constant spray angle and a spray amount toward the piston.

Preferably, as shown in FIG. 5, the channel 31 formed inside the nozzle 30 according to the present invention may be designed to maintain a length L / diameter D ratio of at least 8 or more.

3 is a view showing an open state of the piston cooling device according to the present invention, Figure 4 is a view showing a configuration for adjusting the opening and closing set pressure of the piston cooling device according to the present invention.

2 to 4, the cooling oil supplied to the cooling oil gallery 2a of the cylinder block 2 by the operation of an oil pump (not shown) is introduced into the inlet 11 of the body 10, The one side of the valve 23 is pressed through the inlet hole 241 of the valve support 24.

When the pressure of the cooling oil introduced into the plunger opening and closing means 20 is a low pressure that cannot overcome the elastic force of the spring 22 supporting the opposite side of the valve 23, as shown in FIG. 2. The valve 23 in close contact with the valve support 24 is maintained in a closed state to block the supply of cooling oil.

For example, when the initial oil supply for starting the engine is started from a pre LO pump such as an electric motor provided instead of the main oil pump to supply the cooling oil before starting the engine. When the supply pressure is inevitably set low, the plunger opening and closing means 20 is blocked because the elastic force of the spring 22 supporting the valve 23 is not overcome, thereby reducing the consumption of unnecessary cooling oil.

On the other hand, when the pressure of the cooling oil flowing into the plunger opening and closing means 20 is high enough to overcome the elastic force of the spring 22 supporting the opposite side of the valve 23, it is shown in FIG. As described above, the valve 23 in close contact with the valve support 24 is compressed to overcome the elastic force of the opposite spring 22 and is spaced apart from the valve support 24 to open the flow path. As a result, the cooling oil passes through the space between the valve support 24 and the valve 23, passes through the outlet hole 211 of the spring support 21, and is formed at the end of the inner passage 13 of the body 10. 12) and passes through the channel 31 of the nozzle 30 to spray toward the piston.

In this way, the plunger opening and closing means 20 operates only under a supply pressure condition higher than the set pressure (pressure for overcoming the holding force of the spring), but the central inlet hole 241 of the valve support 24 and the ball-shaped valve 23 The linear opening and closing path parallel to the inner passage 13 of the body 10 along the central outlet hole 211 of the spring support 21 and radially formed along the periphery; It is possible to maintain a full open state immediately from the time of opening, thereby maintaining a rapid and accurate supply pressure and supply amount of the cooling oil toward the downstream nozzle 30.

On the other hand, referring to Figure 3, the plunger opening and closing means 20 according to the present invention further includes a means for adjusting the opening and closing time, that is, the injection time of the cooling oil.

In other words, it is possible to adjust the set pressure of the cooling oil to open the plunger opening and closing means 20, which is a valve support coupled to the inner passage 13 and the screw fastening portion 245 of the body (10) It becomes possible to adjust the elastic support force of the spring 22 which supports the valve 23 according to the screw tightening degree of 24).

For example, when the screw fastening portion 245 of the valve support 24 is further tightened to move in the direction in which the spring 22 is compressed (rightward in the drawing), the valve 23 is interlocked with the spring 22 in this direction. It is kept closed in the compressed state. As a result, in this state, the cooling oil introduced from the inlet hole 241 of the valve support 24 overcomes the elastic force of the spring 22 and opens the valve 23 only when it is introduced at a higher pressure than the previous pressure. .

On the contrary, when the screw fastening part 245 of the valve support 24 is unwound and moved to the direction which expands the spring 22 (left direction in drawing), the valve 23 expands the spring 22 in connection with this. Will remain closed. As a result, in this state, the cooling oil introduced from the inlet hole 241 of the valve support 24 can overcome the elastic force of the spring 22 and open the valve 23 even when introduced at a lower pressure than the previous pressure. Will be.

Reference numeral 243 is an "hexagon wrench coupling groove" for tightening or releasing the valve support 24.

As such, the injection time of the cooling oil provided in the plunger opening / closing means 20, that is, the set pressure of the cooling oil for opening the flow path can be freely reset, thereby cooling the engine regardless of various driving conditions of the engine and driving conditions of the oil pump. There is an advantage that can be used to flexibly adjust the injection time, injection amount and injection pressure of the oil.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

(1): piston cooling device (10): body
(11): entrance 12: exit
(13) Inner passage (20): Plunger opening and closing means
21: spring support 22: spring
23: valve 24: valve support
30: nozzle 31: channel

Claims

An inlet 11 is formed on one side in communication with the cooling oil gallery formed in the cylinder block, and the other outlet 12 connected to the inlet 11 through the inner passage 13 faces the bottom of the piston. A body 10 fixedly coupled to the body;
It is installed in the inner passage 13 between the inlet 11 and the outlet 12 of the body 10, by opening the inner passage 13 only when the cooling oil flowing into the inlet 11 is a predetermined pressure or more. Plunger opening and closing means 20 for supplying cooling oil toward the other rear outlet 12; And
And a nozzle (30) coupled to the outlet (12) of the body (10) for injecting cooling oil passing through the channel (31) formed therein.

The method of claim 1,
The plunger opening and closing means 20 includes a spring support 21 which is installed at a locking jaw 210 formed on an inner surface of the inner passage 13 of the body and forms a cooling oil outlet hole 211 at the center thereof;
A valve 23 elastically supported from the spring support 21 toward the inlet 11 of the body by a spring 22;
Cooling oil inlet hole 241 is formed in the center, and the valve support 24 is coupled to the inner passage 13 of the body in a state in which the spring 22 is compressed by pressing the valve 23 in close contact; Piston chiller, characterized in that configured to include.

The method of claim 2,
The valve support 24 is configured to be screwed to the inner surface of the inner passage 13 of the body, the elastic support force of the spring 22 for supporting the valve 23 according to the screw tightening degree of the valve support 24 Piston cooling device, characterized in that configured to adjust.

The method of claim 1,
Piston cooling device, characterized in that to maintain the ratio of the length (L) / diameter (D) of the channel (31) formed in the nozzle (30) or more.

The method of claim 1,
The body (10) is a piston cooling device, characterized in that the nozzle (30) coupled to the outlet (12) is configured to be inclined downward inclined downward from the center so as to face the center of the bottom of the piston.