KR101163465B1 - Coolant distributor for cylinder block of vehicle - Google Patents

Abstract

The present invention relates to a cooling water distribution device for a cylinder block for automobiles, and more particularly, to insert a cooling water distribution device made of plastic into the water jacket of the cylinder block, thereby reducing heat load on the upper end of the cylinder liner and preventing overcooling of the lower end of the cylinder liner. In addition, the present invention relates to a cooling water distribution device for a cylinder block for an automobile, which maintains a liner temperature uniformly in the stroke direction to maintain a temperature distribution favorable to bore deformation and at the same time contribute to fuel efficiency.

To this end, the present invention and the water jacket formed inside the cylinder block; An upper channel formed to be in close contact with the upper outer wall of the water jacket; A stepped portion bent in the radial direction at the lower end of the upper channel; A lower channel formed in a vertical direction at an inner end of the step portion to be in close contact with a lower inner wall surface of the water jacket; It provides a coolant distribution device for a cylinder block for a vehicle, characterized in that it comprises a; a cooling water passage formed on the upper end of the concave portion of the lower channel.

Liner, Cylinder Block, Water Jacket, Piston, Upper Channel, Lower Channel, Water Pump

Description

Coolant distributor for cylinder block for automobiles {Coolant distributor for cylinder block of vehicle}

1 is an exploded perspective view showing a cylinder block according to the present invention.

FIG. 2 is a graph showing the device configuration of the cylinder block taken along the line "A-A" of FIG. 1 and the temperature distribution according to the position of the cylinder block.

Figure 3 is a state diagram showing the cooling water flow of the cooling water distribution apparatus according to the present invention.

Figure 4 is a graph showing the device configuration of the cylinder block according to the prior art and the temperature distribution according to the position of the cylinder block.

<Description of the symbols for the main parts of the drawings>

10: liner 10a: junction

10b: recess groove 11: cylinder block

12: cooling water distribution device 12a: upper channel

12b: stepped portion 12c: lower channel

12d: recessed part 13: water jacket

14: piston 15: water pump

16: opening 17: cooling water passage

18: cylinder head

The present invention relates to a cooling water distribution device for a cylinder block for automobiles, and more particularly, to insert a cooling water distribution device made of plastic into the water jacket of the cylinder block, thereby reducing heat load on the upper end of the cylinder liner and preventing overcooling of the lower end of the cylinder liner. In addition, the present invention relates to a cooling water distribution device for a cylinder block for an automobile, which maintains a liner temperature uniformly in the stroke direction to maintain a temperature distribution favorable to bore deformation and at the same time contribute to fuel efficiency.

In general, the cylinder block serves as the basis of the engine main body, and has a block structure in which four to six cylinders are cast as one, which is an important part of the life of the engine body, and the cylinder head is covered thereon.

The cylinder is made of a cylinder about twice as long as the piston stroke, and the piston is the main body of the engine that generates the necessary power by reciprocating while maintaining the airtight to convert thermal energy into mechanical energy. .

In order to get as much power as possible from this given thermal energy, the compressed mixture and the explosive blast gas compressed between the cylinder and the piston must not be leaked, and the friction and wear caused by the piston sliding should be small.

For this reason, the cylinder block is made of a light alloy of aluminum, which is light in weight and has good thermal conductivity, and many types of cylinder liners made of special cast iron are used. The cylinder liner is engaged to form a water jacket with the cylinder block.

On the other hand, the water jacket of the cylinder block cools the heat generated in the combustion chamber and other mechanical operating parts necessary for the operation of the engine, so that the engine temperature is maintained at an appropriate level so that the engine does not overheat and the optimum thermal efficiency is achieved. It plays a role.

In other words, the heat generated by the engine is cooled by the coolant passing through the water jacket.

However, as shown in FIG. 4, the conventional water jacket has a structure in which the coolant discharged from the water pump simply flows into the water jacket 130 of the cylinder block 110.

At this time, when the flow rate of the coolant flowing to the cylinder block 110 is fast, the temperature of the cylinder liner 100 decreases due to an increase in the heat transfer coefficient. On the contrary, when the flow rate is slow, the temperature of the cylinder liner 100 increases.

In addition, since heat is typically transferred from the combustion chamber 101 to the upper end of the cylinder block 110, the heat load is large, and the lower end of the cylinder block 110 has a low heat load.

Therefore, when the coolant simply flows through the water jacket 130 of the cylinder block 110, the upper end of the cylinder liner 100 tends to overheat, and the lower end of the cylinder liner 100 tends to overcool. have.

In this case, the temperature distribution of the cylinder liner 100 is kept high at the top and low at the bottom.

That is, there is a risk of overheating at the upper end of the cylinder liner 100 or the siamese, and there is a problem that fuel efficiency is deteriorated due to overcooling at the middle of the liner.

In addition, the oil consumption is increased due to the deformation of the bore due to non-uniform temperature distribution, or there is a problem in that the application of the storage force piston ring for fuel efficiency improvement is difficult.

The present invention has been made in view of the above, by inserting a coolant distribution device made of plastic into the water jacket of the cylinder block, reducing the heat load on the upper end of the cylinder liner, preventing overcooling of the lower end of the cylinder liner, the liner temperature It is an object of the present invention to provide a cooling water distribution device for a cylinder block for automobiles which maintains a temperature distribution advantageous to bore deformation by maintaining uniformly in the stroke direction and at the same time contributes to fuel efficiency improvement.

The present invention for achieving the above object is a water jacket formed inside the cylinder block; An upper channel formed to be in close contact with the upper outer wall of the water jacket; A stepped portion bent in the radial direction at the lower end of the upper channel; A lower channel formed in a vertical direction at an inner end of the step portion to be in close contact with the lower inner wall of the water jacket; And a cooling water passage formed at an upper end of the recess of the lower channel.

In a preferred embodiment, the upper channel, the stepped portion and the lower channel are integrally formed, characterized in that the plastic material having a low heat transfer coefficient.

In a more preferred embodiment, an opening is formed at one end of the upper channel and the lower channel, through which the cooling water of the water pump is classified into a cylinder head, an upper channel and a lower channel, and the other end of the upper channel and the lower channel. It is characterized in that joining.

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

FIG. 1 is an exploded perspective view showing a cylinder block according to the present invention, and FIG. 2 is a graph showing the device configuration of the cylinder block taken along the line “A-A” of FIG. 1 and the temperature distribution according to the position of the cylinder block.

The present invention relates to a coolant distribution device 12 of a cylinder block (11) for a vehicle to maintain a uniform temperature distribution of the liner (10).

The present invention focuses on inserting the coolant distribution device 12 into the water jacket 13 of the cylinder block 11 so that the coolant flow is concentrated on the top of the cylinder block 11 having a high heat load.

The present invention provides a coolant distribution device 12 made of a plastic material having a low heat transfer coefficient inserted into a water jacket 13 of a cylinder block 11 to maintain an optimal temperature of the liner 10 of the cylinder block 11. do.

Inside the cylinder block 11, a plurality of liners 10 are formed according to the number of cylinders so that the piston 14 is inserted, and the cooling water surrounds the plurality of liners 10 and along the outer circumferential surface of the liner 10 cylinder block. (11) The water jacket 13 is formed to circulate inside.

At this time, the liner 10 is formed between the junction portion 10a where the liners 10 arranged in series meet with each other, and each of the junction portion 10a has a recessed groove 10b formed in the vertical direction.

Cooling water distribution device 12 according to the present invention is inserted into the water jacket 13 of the cylinder block 11, and the upper channel (12a) located in the upper and lower cylinder block 11 with the stepped portion (12b) boundary The lower channel 12c is integrally formed.

The upper channel 12a is in close contact with the outer wall surface of the water jacket 13 of the cylinder block 11, and a passage through which cooling water flows into the upper channel 12a is formed, and the water pump 15 supplying the cooling water. An opening 16 is formed at one end of the upper channel 12a toward the side.

The stepped portion 12b is bent in the radial direction at the lower end of the upper channel 12a, the lower channel 12b is in close contact with the inner wall surface of the water jacket 13, the cooling water to the outside of the lower channel 12c A flowable passage is formed, and an opening 16 is formed at one end of the lower channel 12c toward the water pump 15 for supplying cooling water.

The upper channel 12a and the lower channel 12c are closely formed in a lattice form along the plurality of liners 10 and correspond to the recessed groove 10b in the middle of the upper channel 12a and the lower channel 12c. The recessed part 12d to be formed was formed in the vertical direction.

Cooling water passages 17 are formed at the upper end and the stepped portion 12b of the lower channel 12c so that the coolant flowing in the lower channel 12c moves to the upper channel 12a.

Referring to the operating state of the coolant distribution apparatus 12 according to the present invention by such a configuration as follows.

Figure 3 is a state diagram showing the flow of coolant in the coolant distribution apparatus according to the present invention.

Cooling water discharged from the water pump 15 is divided into three passages of the cylinder head 18, the upper channel 12a and the lower channel 12c, respectively.

The coolant of the upper channel 12a has a high flow rate and cools the upper end of the cylinder block 11, and joins the coolant of the cylinder head 18 at the rear of the engine to exit the engine.

The coolant in the lower channel 12c is increased at a high flow rate through the coolant passage 17 in the recess 10b of the liner 10 and exits to the cylinder head 18.

Since the cooling water in the lower portion bordering the stepped portion 12b does not receive heat by the lower channel 12c having a low heat transfer coefficient, the cooling water is cooled through the cooling water passage 17 of the concave portion 12d. Ascending in the 18) direction, the upper end of the liner 10 is directly cooled to reduce heat load at a high flow rate.

In addition, since the heat transfer of the cooling water is not performed through the lower channel 12c to the lower portion of the liner 10 in which the lower channel 12c is in close contact, the temperature of the liner 10 under the cylinder block 11 is increased to form a liner surface. The oil temperature also increases, which contributes to friction reduction and improves fuel efficiency.

Therefore, the heat of combustion is not transferred to the lower cooling water by the lower channel 12c of the plastic material in close contact with the water jacket 13 below the cylinder block 11, and thus through the cooling water passage 17. As the cool lower coolant cools the top of the liner 10, the coolant flow is concentrated in the upper channel 12a so that the coolant flow is concentrated in the upper channel 12a, unlike the flow pattern in which the coolant spreads throughout the water jacket 13 of the cylinder block 11 as in the conventional art. Since it is advantageous to cool the top of the cylinder block 11 having a large heat load.

In addition, since the temperature of the liner 10 can be made uniform in the stroke direction, the bore deformation is small, and favorable conditions to which the storage force piston ring can be applied are established, thereby improving fuel efficiency.

In addition, since the inner surface of the water jacket 13 is insulated from the lower channel 12c of the cylinder block 11, the heat transfer amount to the cooling water is reduced, so that the cooling performance of the vehicle is improved, and the cooling water temperature is relatively high during high load driving such as climbing. By keeping it low, it is possible to apply relatively small radiators or fans.

As described above, according to the cooling water distribution device of the automotive cylinder block according to the present invention, the combustion heat is not transferred to the lower cooling water by the lower channel of the stepped portion by the lower channel of the plastic material in close contact with the water jacket of the lower cylinder block cooling water Cooling lower coolant through the passage cools the top of the liner. Unlike the flow pattern in which the coolant spreads throughout the water jacket of the cylinder block as in the prior art, the coolant flow is concentrated in the upper channel and thus has a high flow rate. It is advantageous for cooling the top.

In addition, since the temperature of the liner can be made uniform in the stroke direction, the bore deformation is small, and favorable conditions to which the storage force piston ring can be applied are established, thereby improving fuel efficiency.

In addition, since the inner surface of the water jacket is insulated from the lower channel of the cylinder block, heat transfer to the cooling water is reduced, thereby improving the cooling performance of the vehicle and maintaining a relatively low cooling water temperature during high load driving such as climbing. I can apply a fan.

Claims (3)

A water jacket 13 formed in the cylinder block 11; An upper channel 12a formed in close contact with the upper outer wall of the water jacket; A stepped portion (12b) bent in the radial direction at the lower end of the upper channel; A lower channel (12c) formed in a vertical direction at the inner end of the step portion to be in close contact with the lower inner wall of the water jacket; A cooling water passage 17 formed at an upper end of the concave portion of the lower channel; Cooling water distribution device for a cylinder block for a vehicle, characterized in that comprises a. The apparatus of claim 1, wherein the upper channel, the stepped portion, and the lower channel are integrally formed with a plastic material having a low heat transfer coefficient. According to claim 1 or 2, wherein the opening 16 is formed at one end of the upper channel and the lower channel, through which the cooling water of the water pump is classified into the cylinder head, the upper channel and the lower channel and the upper channel and Cooling water distribution device of a cylinder block for a vehicle, characterized in that joined at the other end of the lower channel.

Images