KR100980955B1 - barrier structure of water jacket in engine - Google Patents

Abstract

The present invention relates to a partition structure of an engine water jacket, comprising: an upper partition (10) and a lower partition (20) for partitioning an inner space of a water jacket into an upper channel, an intermediate channel, and a lower channel; And blocking walls 30 and 40 which connect the front and rear ends of the upper and lower partitions 10 and 20 to stagnate the flow of the intermediate channel.

Therefore, the coolant flow of the intermediate channel is stagnant, so that the upper and lower parts of the liner have a high temperature and the upper and lower parts of the coolant flow have a low temperature.

This has the effect of improving fuel economy as an optimal condition for reducing the piston friction loss.

Water Jacket Spacer, Water Jacket Insert, Water Jacket Bulkhead, Water Jacket Sealing Structure

Description

Barrier structure of water jacket in engine

The present invention relates to a partition structure of an engine water jacket inserted into a water jacket of an engine cylinder block to form a temperature distribution of a liner in an advantageous state for reducing piston friction by controlling cooling water flow.

As shown in Figure 1, the cylinder block 1 is formed with a bore (2) according to the number of cylinders, the inner wall of the bore (2) is provided with a liner (3) having excellent heat resistance and wear resistance, the bore ( A water jacket 4 through which cooling water flows is formed in the peripheral portion of 2) to prevent overheating of the engine.

On the other hand, the liner (3) is a portion directly friction with the piston reciprocating up and down, the friction loss amount is increased and decreased depending on the friction state with the piston, this friction loss is a major improvement in the fuel economy of the engine.

The friction loss of the piston is greatly influenced by the viscosity of the engine oil applied to the inner circumferential surface of the liner 3, and the viscosity of the oil is determined by the temperature of the oil.

Therefore, it is desirable to reduce the viscosity of the oil so that the friction loss can be reduced, and in order to do so, the temperature distribution of the oil-contacted liner 3 is very important.

Since the temperature distribution of the liner 3 is formed by the cooling water of the water jacket 4 flowing outside thereof, the temperature distribution of the liner 3 is reduced by adjusting the cooling water flow state in the water jacket 4. It is necessary to form in a suitable state.

Accordingly, the present invention has been made by the above needs, by adjusting the flow state inside the water jacket to form a high temperature distribution of the liner upper and lower parts and a high middle part to minimize the friction loss by the piston to improve fuel economy It is an object of the present invention to provide a partition structure of an engine water jacket that can be made.

The present invention for achieving the above object,

An upper partition and a lower partition partitioning an inner space of the water jacket into an upper channel, an intermediate channel, and a lower channel;

A blocking wall connecting the ends of the upper and lower partitions to stagnate the flow of the intermediate channel;

It is made, including.

The upper and lower partitions are formed in a shape in which the arc shape is repeatedly formed along the outer circumferential surface of the bore.

In addition, air vent holes are formed in the upper and lower partitions.

An air vent hole may be formed in the barrier wall.

Meanwhile, a flow guide protrudes from a lower surface of the lower partition wall.

The end of the flow guide is formed in a wedge shape.

The sealing ring element may be applied between both side surfaces of the upper and lower partition walls and an inner wall surface of the water jacket.

In addition, a support may be connected between the upper and lower partitions.

When the bulkhead structure of the present invention as described above is installed, the inner space of the water jacket is partitioned into an upper channel, an intermediate channel, and a lower channel, among which the upper and lower channels have a smooth flow, while the intermediate channel has a stagnation of the flow. The upper and lower portions of the liner corresponding to the upper and lower channels have a low temperature, and the middle portion corresponding to the intermediate channel has a high temperature.

Therefore, since the temperature of the oil is formed under the condition that the frictional force is generated in the entire region of the liner, the piston friction loss is reduced, thereby improving the fuel economy of the engine.

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

Figure 2 is an embodiment of the partition structure of the engine water jacket according to the present invention, Figure 3 is a cross-sectional view of the partition structure is installed on the water jacket.

As shown in FIG. 2, the present invention connects both ends of the upper partition 10 and the lower partition 20 and the upper partition 10 and the lower partition 20 having the same curved shape as the bore 2. It consists of a blocking wall. The blocking wall includes a front blocking wall 30 and a rear blocking wall 40.

In FIG. 3, a liner 3 is installed on the inner circumferential surface of the bore 2, and a water jacket 4 is formed outside the bore 2, and the partition structure according to the present invention is inserted into the water jacket 4. Cross section is shown.

As shown, the partition structure is inserted into the water jacket 4 so that the inner space of the water jacket 4 is formed by the upper channel 4a and the intermediate channel 4b by the upper partition 10 and the lower partition 20. And the lower channel 4c, the area of the intermediate channel 4b is wider than the upper channel 4a and the lower channel 4c.

In particular, the intermediate channel 4b is blocked by the front blocking wall 30 and the rear blocking wall 40 so that the cooling water inlet and the discharge passage of the intermediate channel 4b are blocked.

That is, the intermediate channel 4b of the water jacket 4 is surrounded by the upper partition 10 and the lower partition 20, the front barrier wall 30 and the rear barrier wall 40 is stagnant flow. The cooling water flow congestion of the intermediate channel 4b of the water jacket 4 is equally applied to both sides of the bore 2 by installing the pair of partition structures on both sides of the water jacket 4, respectively. Is done.

In addition, the outer wall surface of the water jacket (4) and the end portion of the upper partition 10 and the lower partition wall 20 in contact with it is formed in the inclined surface so that the upper partition 10 and the lower partition wall 20 is the same as its width. The installation state can be maintained at a position in the water jacket 4 having a width.

The upper partition 10 and the lower partition 20 are formed in a shape in which arc shapes are repeatedly formed along a plurality of bore outer circumferential surfaces, that is, the planar view is formed in the same shape as the curved shape of the water jacket 4 in plan view. The installation position in the flow direction (cylinder block longitudinal direction) is also maintained.

On the other hand, in order to reinforce the rigidity of the entire bulkhead structure, considering the ease of installation and removal of the inside of the water jacket (4), as shown in Figures 4 and 5 between the upper partition 10 and the lower partition 20. It may form a support 50 for connecting.

When the support 50 is connected vertically to the upper partition 10 and the lower partition 20, as shown in Figure 6 (a) to be integrally formed over the entire length of the upper / lower partitions (10, 20). Alternatively, as shown in FIG. 6B, a plurality of cells may be formed at predetermined intervals. However, it is structurally stable to be installed at a point corresponding to the concave portion between the bore and the bore as shown in FIG.

In addition, the support 50 may be formed without a portion protruding to the upper / lower portion of the upper partition 10 and the lower partition 20, as shown in Figure 4 the upper partition 10 and the lower partition 20 It may be formed to protrude further to the upper and lower than).

On the other hand, when the coolant does not exist in the partition structure (= when the coolant does not exist in the intermediate channel 4b), a large area of both sides of the bore 2 is overheated, so problems such as deformation and sintering of parts occur. In order to fill the intermediate channel 4b with cooling water, air vent holes 11 and 21 are formed in the upper partition 10 and the lower partition 20 as shown in FIG. 7. In addition, air vent holes may be formed in the front blocking wall 30 and the rear blocking wall 40. (not shown) A plurality of air vent holes are formed at predetermined intervals.

Therefore, the air bubbles escape through the air vent holes 11 and 21 toward the upper channel, and in addition, the coolant flows into the intermediate channel 4b, thereby preventing overheating due to the lack of coolant.

When the partition structure according to the present invention is installed in the water jacket 4 as described above, the inner space of the water jacket 4 is divided into upper, middle, and lower channels 4a, 4b, and 4c, among which the upper channel. Cooling water flows smoothly into the 4a and the lower channel 4c, while in the intermediate channel 4b, the cooling water is isolated and the flow rate decreases, resulting in stagnation.

Therefore, since the cooling of the middle part of the cylinder block is not performed smoothly compared to the upper part and the lower part, the temperature of the middle part rises and the temperature of the middle part of the liner 3 also rises.

Therefore, the oil viscosity of the middle portion of the liner 3 is lowered, so that the amount of friction loss caused by the piston is reduced, thereby improving the fuel economy of the engine. This friction loss reduction effect is more effective because of the high speed of the piston in the middle portion of the liner (3).

In addition, since the cooling loss does not occur as the temperature of the middle portion of the liner 3 rises, this also becomes a factor of fuel efficiency improvement.

However, as shown in the graph of FIG. 8, in the vicinity of the top dead center and the bottom dead center of the piston, that is, in the upper region and the lower region of the liner 3, the frictional force increases as the oil temperature increases. This can be seen from the case.) This is a phenomenon in which the stability of the motion is lowered due to the change of direction of the piston near the top dead center and the bottom dead center.

Therefore, in the upper region and the lower region of the liner 3, the frictional force can be reduced by reducing the frictional force by lowering the temperature of the oil as opposed to the intermediate region.

Considering this situation, the upper channel 4a and the lower channel 4c of the water jacket 4 have a higher flow rate than the intermediate channel 4b, so that the coolant flows smoothly, so that the cylinder block in the corresponding area is smoother. The cooling is possible, and thus the temperature of the upper and lower portions of the liner 3 is reduced to meet the above conditions, thereby reducing the amount of friction loss and improving fuel economy.

As such, when the barrier rib structure of the present invention is installed, the distribution of the temperature (according to the stroke) along the up and down height of the liner 3 is as shown by the thick solid line in FIG. 9. That is, it can be seen that the portions (A and C portions) corresponding to the upper and lower regions of the liner 3 have a low temperature, while the portions (the B portions) corresponding to the middle region are relatively high in temperature.

Meanwhile, since the amount of cooling water distributed to the upper portion (upper channel and intermediate channel) varies according to the area (flow cross-sectional area) of the lower channel 4c, the flow rate of the cooling channel of the lower channel 4c is enhanced. In this case, the coolant flow rate of the upper channel 4a may decrease, and thus, unlike the intended purpose, an increase in the temperature of the upper portion of the liner 3 may cause an effect of reducing friction loss in the upper region.

 In this case, as shown in FIG. 10, a flow guide 22 having a predetermined cross-sectional area is formed on the lower surface of the lower partition wall 20.

The flow guide 22 is preferably formed integrally protruding from the lower surface of the lower partition wall 20, as shown in Figs. Because the width of the parts is not wide, it is not easy to work by combining them into separate parts.

As described above, the flow guide 22 formed on the lower surface of the lower partition wall 20 reduces the coolant flow area of the lower channel 4c by the cross-sectional area corresponding to its width.

Therefore, the amount of cooling water reduced in the lower channel 4c is replenished with the upper channel to secure the amount of cooling water required for the upper channel 4a, thereby making it possible to form a lower upper region temperature of the liner 3.

In this case, in the case of the lower channel 4c, a decrease in the amount of cooling water acts as a factor of temperature increase. However, as the flow cross-sectional area decreases, the flow rate of the cooling water is increased to secure a required flow amount, thereby reducing the amount of cooling water. The temperature can be kept low.

In addition, the inlet end portion (“ga”) of the water jacket 4 of the flow guide 22 is sharply formed in a wedge shape so that the cooling water can be smoothly introduced into the water jacket 4. The same may be applied to the opposite end of the flow guide 22 for ease of drainage from the water jacket 4.

Meanwhile, a sealing element may be applied between both side surfaces of the upper partition wall 10 and the lower partition wall 20 and an inner wall surface of the water jacket 4. In this case, since the sealing property between the adjacent channels is improved, a more reliable temperature gradient can be formed for each flow area by minimizing the cooling water mixing between adjacent channels having different calories.

1 is a cross-sectional view of the cylinder block bore portion,

2 is a perspective view of a partition structure according to the present invention,

3 is a cross-sectional view of the partition structure is installed on the water jacket,

4 is a perspective view of a state in which a support is formed in the partition structure;

5 is a cross-sectional view of an installation state of a partition structure in which a support is formed;

Figure 6 (a), (b) is an exemplary embodiment of the support,

7 is a cross-sectional view illustrating a state in which an air vent hole is formed in an upper partition and a lower partition of a partition structure;

8 is a graph showing a change in friction force according to the crank angle (piston position can be estimated) for each oil temperature,

9 is a vertical temperature distribution diagram of the liner,

10 is a cross-sectional view showing a state in which a flow guide is formed in the lower partition of the partition structure,

11 is an overall perspective view of a state in which a flow guide is formed;

12A and 12B are perspective views illustrating the partition structure of FIG. 11 from another angle.

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

1: Cylinder block 2: Bore

3: liner 4: water jacket

4a: upper channel 4b: intermediate channel

4c: lower channel 10: upper partition

20: lower partition 22: flow guide

30: front barrier wall 40: rear barrier wall

50: support

Claims (8)

A partition structure of an engine water jacket having an upper partition, a lower partition, and a barrier wall connecting end portions of the partition wall to partition an inner space of the water jacket into an upper channel, an intermediate channel, and a lower channel. Partition structure of the engine water jacket comprising a protrusion formed on the lower surface of the lower partition wall. delete delete delete delete The partition structure of an engine water jacket according to claim 1, wherein an end portion of the flow guide is formed in a wedge shape. The barrier rib structure of claim 1, wherein a sealing element is coated between both side surfaces of the upper and lower barrier ribs and an inner wall of the water jacket. delete

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