JP5809950B2 - Composite materials, internal combustion engines and automobiles - Google Patents

Description

  The present invention relates to a composite material that deforms in response to a temperature change. The present invention also provides an internal combustion engine capable of making the wall temperature of the cylinder bore wall of the cylinder block uniform by controlling the flow rate of the cooling water flowing through the grooved cooling water flow path of the cylinder block, and an automobile having the internal combustion engine. About.

  In the internal combustion engine, fuel explosion occurs at the top dead center of the piston in the bore, and the piston is pushed down by the explosion, so that the temperature is high on the upper side of the cylinder bore wall and the temperature is lower on the lower side. Therefore, there is a difference in the amount of thermal deformation between the upper side and the lower side of the cylinder bore wall, and the upper side expands greatly, while the lower side expansion decreases.

  As a result, the frictional resistance with the cylinder bore wall of the piston increases, and this is a factor that lowers fuel consumption. Therefore, it is required to reduce the difference in thermal deformation between the upper side and the lower side of the cylinder bore wall. .

  Therefore, conventionally, in order to make the wall temperature of the cylinder bore wall uniform, a spacer is installed in the grooved cooling water flow path, and the flow of the cooling water in the grooved cooling water flow path is adjusted so that the cylinder bore wall caused by the cooling water Attempts have been made to control the cooling efficiency on the upper side and the cooling efficiency on the lower side. For example, in Patent Document 1, the groove-shaped cooling heat medium flow path is partitioned into a plurality of flow paths by being arranged in a groove-shaped cooling heat medium flow path formed in a cylinder block of an internal combustion engine. A channel partition member formed at a height less than the depth of the groove-shaped cooling heat medium flow channel, and the bore-side flow channel and the anti-bore side flow channel in the groove-shaped cooling heat medium flow channel And a flow path dividing member that is a wall portion that is divided into the groove-shaped cooling heat medium flow path, and a tip edge portion formed in the groove-shaped cooling heat medium flow direction toward the opening of the groove-shaped cooling heat medium flow path. By being formed of a flexible material so as to extend beyond one inner surface of the medium flow path, the leading edge portion is caused by its own bending restoring force after completion of insertion into the groove-shaped cooling heat medium flow path. Is in contact with the inner surface at an intermediate position in the depth direction of the groove-shaped cooling heat medium channel, and the bore-side channel and the A flexible lip member, the internal combustion engine cooling heat medium flow passage partition member comprising the disclosed which separates the bore side flow path.

JP 2008-31939 A (Claims)

  However, according to the heat medium flow path partition member for cooling the internal combustion engine of the cited document 1, the wall temperature of the cylinder bore wall can be made uniform to some extent, so that the difference in the amount of thermal deformation between the upper side and the lower side of the cylinder bore wall is reduced. In recent years, however, it has been demanded to further reduce the difference in the amount of thermal deformation between the upper side and the lower side of the cylinder bore wall.

  Accordingly, an object of the present invention is to provide an internal combustion engine having a uniform wall temperature of a cylinder bore wall and an automobile having the internal combustion engine.

  By the way, as a material which changes according to a temperature change, the bimetal material which bonded together 2 types of metal materials from which a linear expansion coefficient differs is known. However, since the conventional bimetal material is composed of a metal material, the conventional bimetal cannot be used in a place where metal corrosion occurs.

  Therefore, an object of the present invention is to provide a novel material that replaces a conventional bimetal that deforms in response to a temperature change.

  As a result of intensive studies to solve the above-described problems in the prior art, the present inventors have (1) two material layers made of rubber materials having different linear expansion coefficients due to different contents or types of inorganic powders. The composite material obtained by joining the members is deformed according to the temperature change. (2) By installing such a composite material as a fin member in the groove-shaped cooling water flow path of the cylinder block, the groove-shaped cooling is performed. The flow rate of the cooling water flowing in the water flow path can be controlled according to the temperature of the cooling water, and (3) the temperature of the wall surface of the cylinder bore wall can be kept in a certain temperature range by such an action. As a result, the present invention has been completed.

That is, the present invention (1) comprises a first material layer and the second material layer are joined via the reinforcement material,
The first material layer and the second material layer are both formed of a rubber material,
Of the rubber material forming the first material layer and the rubber material forming the second material layer, at least the rubber material forming the second material layer contains an inorganic powder,
Since the content or type of inorganic powder in the rubber material forming the first material layer and the rubber material forming the second material layer is different, the second material layer is compared with the linear expansion coefficient of the first material layer. The linear expansion coefficient of the material layer has increased ,
Reinforcing material, bimetal member der Rukoto the two metals material linear expansion coefficient is different are bonded directly or via an intermediate metal layer,
A composite material characterized by the above is provided.

Further, in the present invention (2), a fin member for controlling the flow rate of the cooling water flowing in the grooved cooling water flow path is installed in the grooved cooling water flow path of the cylinder block of the internal combustion engine.
The fin member is the composite material of the present invention (1);
An internal combustion engine characterized by the above is provided.

  An automobile having the internal combustion engine of the present invention (2) is provided.

  According to the present invention, the uniformity of the wall temperature of the cylinder bore wall of the internal combustion engine can be increased. Therefore, according to the present invention, the difference in the amount of thermal deformation between the upper side and the lower side of the cylinder bore wall can be reduced. Moreover, according to this invention, the novel material which replaces with the conventional bimetal which deform | transforms according to a temperature change can be provided.

It is a typical perspective view which shows the example of a form of the composite material of this invention. It is a figure which shows a mode that the composite material 1a shown in FIG. 1 deform | transforms. It is an end view of the composite material 1a shown in FIG. It is a schematic diagram of the example in which the 1st material layer and the 2nd material layer are joined via the reinforcing material. It is a typical end elevation of the example in which the 1st material layer and the 2nd material layer are joined via the reinforcing material. It is the figure which looked at the state to which the fixed end 91 of the composite material 1a shown in FIG. 1 was fixed to the to-be-fixed object 8 from the upper side. It is a schematic diagram which shows a mode when the composite material 1a curves in the direction of the code | symbol 12. FIG. It is a typical top view showing a cylinder block concerning an internal-combustion engine of the present invention. It is a perspective view of the cylinder block shown in FIG. It is a typical top view which shows the cylinder block by which the fin member is installed in the groove-shaped cooling water flow path. FIG. 11 is an end view taken along line xx of FIG. 10. It is a schematic diagram which shows a mode that a fin member deform | transforms according to a temperature change. It is a figure which shows the numerical hydrodynamic analysis result in an Example.

In the composite material of the present invention, the first material layer and the second material layer are joined directly or via a reinforcing material,
The first material layer and the second material layer are both formed of a rubber material,
Of the rubber material forming the first material layer and the rubber material forming the second material layer, at least the rubber material forming the second material layer contains an inorganic powder,
Since the content or type of inorganic powder in the rubber material forming the first material layer and the rubber material forming the second material layer is different, the second material layer is compared with the linear expansion coefficient of the first material layer. The coefficient of linear expansion of the material layer is increased,
Is a composite material characterized by

  The composite material of this invention is demonstrated with reference to FIG.1 and FIG.2. FIG. 1 is a schematic perspective view showing a composite material according to an embodiment of the present invention, and shows a composite material 1a before deformation. In FIG. 1, a composite material 1a is a composite material in which two types of layered materials having different linear expansion coefficients, ie, a first material layer 2 and a second material layer 3 are joined. Each of the first material layer 2 and the second material layer 3 has a layered shape extending in the plane direction, and one surface of the first material layer 2 and one surface of the second material layer 3 are directly bonded. Thus, the composite material 1a is formed. Therefore, the first material layer 2 is disposed on one side of the composite material 1a (the upper surface in the composite material 1a shown in FIG. 1), and the other surface of the composite material 1a (the composite material shown in FIG. 1). In 1a, the second material layer 3 is disposed on the lower surface side.

  In the composite material 1a, the linear expansion coefficients of the first material layer 2 and the second material layer 3 constituting the composite material 1a are different, and compared with the linear expansion coefficient of the first material layer 2, the second material layer 3 The linear expansion coefficient is larger. That is, “the linear expansion coefficient of the first material layer 2 <the linear expansion coefficient of the second material layer 3”. FIG. 2 is a schematic view showing a state where the composite material 1a shown in FIG. 1 is deformed, and a state in which the fixed end 91 of the composite material 1a shown in FIG. It is a figure. FIG. 2 (A) shows the composite material 1a before deformation and is in a state when the temperature is X ° C., and FIG. 2 (B) is in a state when the temperature is Y ° C. higher than X ° C. That is, “X <Y”.

  In FIG. 2, the fixed end 91 of the composite material 1 a is fixed to the fixed object 8, while the free end 92 is not fixed anywhere. Since the first material layer 2 and the second material layer 3 have the same length at the temperature shown in FIG. 2A, the composite material 1a is straight. Since the second material layer 3 has a larger linear expansion coefficient than the first material layer 2, the second material layer 3 has a higher temperature than the temperature in the state of FIG. Since the amount of thermal expansion is larger, the composite material 1a is deformed to warp upward as shown in FIG. Therefore, the position of the free end 92 in FIG. 2B moves upward by the amount of deformation 4 compared to the position of the free end 92 in FIG.

  In addition, after the temperature is increased and deformed to the state of FIG. 2B, the second material layer 3 contracts more than the first material layer 2 when the temperature becomes lower than the temperature of FIG. Since the amount increases, the shape is deformed so as to return to the state of FIG. 2A, and the position of the free end 92 moves downward from the state of FIG. And when temperature falls to the temperature of the state of FIG. 2 (A), it will return to the state of FIG. 2 (A).

  Both the first material layer and the second material layer according to the composite material of the present invention are formed of a rubber material. The rubber material for forming the first material layer and the second material layer is not particularly limited. For example, ethylene propylene diene rubber (EPDM), nitrile butadiene rubber (NBR), natural rubber, styrene butadiene rubber, chloroprene rubber, silicon Examples thereof include rubber and fluororubber. In addition, the kind of rubber material which forms a 1st material layer and a 2nd material layer is suitably selected by the place and application which a composite material is installed.

  The rubber material forming the first material layer and the second material layer contains other components such as additives such as a vulcanizing agent and an antioxidant as long as the effects of the present invention are not impaired as appropriate. Also good.

  Of the rubber materials forming the first material layer and the second material layer, at least the rubber material forming the second material layer contains an inorganic powder. That is, the combinations shown in Table 1.

  The inorganic powder contained in the rubber material forming the first material layer or the rubber material forming the second material layer is an inorganic material in the rubber material forming the first material layer and the rubber material forming the second material layer. There is no particular limitation as long as the linear expansion coefficient of the second material layer can be made higher than the linear expansion coefficient of the first material layer by changing the content or type of the powder. Examples of the inorganic powder include carbon powder and metal oxide powder such as silica powder. Among these, as the inorganic powder, carbon powder and silica powder are preferable because the difference in thermal expansion coefficient between the second material layer and the first material layer can be easily controlled. The inorganic powder may be a single type or a combination of two or more types. Moreover, the kind or combination of the inorganic powder contained in the rubber material forming the first material layer and the inorganic powder contained in the rubber material forming the second layer may be different.

  In the composite material of the present invention, the linear expansion coefficient of the first material layer is different because the content or type of the inorganic powder in the rubber material forming the first material layer and the rubber material forming the second material layer is different. Thus, the linear expansion coefficient of the second material layer is increased. That is, the content of the inorganic powder in the rubber material forming the first material layer and the rubber material forming the second material layer or the type of inorganic powder to be contained, or both the type and content of the inorganic powder are appropriately determined. By selecting, the linear expansion coefficient of the second material layer is made larger than the linear expansion coefficient of the first material layer.

  Examples of a method for making the linear expansion coefficient of the second material layer larger than the linear expansion coefficient of the first material layer include: (1) the rubber material forming the first material layer does not contain inorganic powder, and (2) the rubber material forming the two-material layer contains an inorganic powder, (2) the rubber material forming the first material layer and the rubber material forming the second material layer contain the same kind of inorganic powder, and Increasing the volume ratio of the inorganic powder in the rubber material forming the second material layer compared to the volume ratio of the inorganic powder in the rubber material forming the one material layer, (3) Rubber forming the first material layer The rubber material forming the material and the second material layer contains different types of inorganic powders in the same volume ratio, and the linear expansion coefficient of the inorganic powder contained in the rubber material forming the second material layer is Making it larger than the linear expansion coefficient of the inorganic powder contained in the rubber material forming the first material layer, (4) the rubber material forming the first material layer The rubber material forming the second material layer contains two or more inorganic powders, and the first material layer is formed with a volume ratio of the inorganic powder having a large linear expansion coefficient to the inorganic powder having a small linear expansion coefficient. For example, the rubber material forming the second material layer may be higher than the rubber material. In addition, these are illustrations, and the linear expansion coefficient of the second material layer is made larger than the linear expansion coefficient of the first material layer by appropriately selecting the kind of rubber material, inorganic powder, its content, combination, and the like. Are included in the present invention.

  In the composite material of the present invention, the first material layer and the second material layer may be directly bonded, or the first material layer and the second material layer are bonded via a bimetal material. Also good. FIG. 3 is an end view of the composite material 1a shown in FIG. 1, and is an end view taken along a plane parallel to the front surface of the composite material 1a shown in FIG. The composite material 1a shown in FIG. 3 is an example in which the first material layer 2 and the second material layer 3 are directly joined. 4 and 5 are schematic end views of an embodiment in which the first material layer and the second material layer are joined via a bimetal material. 4A is an end view of the composite material 1b, and FIG. 4B is a plan view of the composite material 1b. In FIG. 4B, the outline of the bimetal material 10a disposed between the first material layer 2 and the second material layer 3 is indicated by a dotted line. FIG. 5 is an end view of the composite material 1c. In both the composite material 1 b shown in FIG. 4 and the composite material 1 c shown in FIG. 5, the bimetal material 10 a is disposed between the first material layer 2 and the second material layer 3. In the composite material 1b, a part of the joining surface of the first material layer 2 and the second material layer 3 is directly joined, and the other part is joined via the bimetal material 10a. Moreover, in the composite material 1c, all the joining surfaces of the first material layer 2 and the second material layer 3 are joined via the bimetal material 10a.

  The bimetal material is a material in which two kinds of metal materials having different linear expansion coefficients are joined directly or via an intermediate metal layer. And in the case where the first material layer and the second material layer of the composite material of the present invention are joined via the bimetal material, among the two kinds of metal materials joined to the bimetal material, Between the first material layer and the second material layer so that the metal material with the lower linear expansion coefficient is on the first material layer side and the metal material with the higher linear expansion coefficient is on the second material layer side. By arranging the bimetal material in the bimetal material, the bimetal material can support the deformation due to the temperature change of the composite material of the present invention, and can be easily deformed due to the temperature change of the composite material.

  The thickness of the first material layer (reference numeral 5 in FIG. 1), the thickness of the second material layer (reference numeral 6 in FIG. 1), and the thickness of the composite material of the present invention (reference numeral 7 in FIG. 1) are as follows. It is appropriately selected depending on the use and place where the composite material is applied.

  The elastic modulus of the first material layer and the elastic modulus of the second material layer are appropriately selected. The smaller the difference between the elastic modulus of the first material layer and the elastic modulus of the second material layer, the more the deformation amount of the composite material. Is preferable in that it increases.

  In the composite material of the present invention, on which surface side the first material layer and the second material layer are arranged is to be deformed so as to warp which surface side, and the temperature of the composite material is increased. It is appropriately selected depending on whether it is deformed by making it, or by making the temperature of the composite material low.

  FIG. 6 is a plan view of FIG. 2 (A), and shows a state in which the fixed end 91 of the composite material 1a shown in FIG. The first material layer 2 and the second material layer 3 when the temperature is changed are perpendicular to the side of the composite material 1a on the fixed end 91 side when the composite material 1a is viewed in plan (in FIG. 6). When selectively expanded in the direction indicated by reference numeral 11, the composite material 1 a is deformed so as to warp in the direction indicated by reference numeral 11 as shown in FIG.

  On the other hand, the first material layer 2 and the second material layer 3 when the temperature is changed are parallel to the side of the composite material 1a on the fixed end 91 side when the composite material 1a is viewed in plan (in FIG. 6). When selectively expanded in the direction indicated by reference numeral 12, the composite material 1a is deformed so as to warp in the direction indicated by reference numeral 12, as shown in FIG. FIG. 7 is a schematic view showing a state where the composite material 1a is warped in the direction of reference numeral 12, and is a view of the composite material 1a as seen from the free end 92 side.

  When the composite material of the present invention is not provided with a means for controlling the deformation direction, the composite material of the present invention has a fixed end side when the composite material is viewed in plan when the temperature is changed. Both the direction perpendicular to and parallel to the sides of the composite material are warped.

  The use of the composite material of the present invention is such that the composite material may warp in a direction perpendicular to or parallel to the side of the composite material on the fixed end side when the composite material is viewed in plan. In some cases, in particular, the deformation direction of the composite material need not be controlled.

  On the other hand, depending on the use of the composite material of the present invention, it may be necessary to control the composite material so as to selectively deform in a certain direction.

  Regarding a method of controlling the deformation direction of the composite material, taking as an example a case where the composite material is selectively warped in a direction perpendicular to the side of the fixed end when viewed in plan (the direction of reference numeral 11 in FIG. 6). explain.

  As a method of selectively warping the composite material of the present invention in a direction perpendicular to the side on the fixed end when the composite material is viewed in plan, for example, a rubber material and a second material forming a first material layer There is a method in which the rubber material forming the layer is oriented in a direction perpendicular to the side of the fixed end when the composite material is viewed in plan. That is, this is a method of controlling the direction in which the composite material warps by orienting the rubber material forming the first material layer and the rubber material forming the second material layer in the direction in which the composite material is desired to be warped.

  1 to 7, for convenience of explanation, the case where the shape of the composite material before deformation is a flat plate shape has been described. However, the shape of the composite material before and after deformation depends on the location where the composite material is installed, It is appropriately selected according to the application.

  As shown in FIG. 2, the composite material of the present invention is deformed according to the temperature change. For example, the composite material according to the temperature change like a switch for turning on / off the power according to the temperature change like a thermostat. The composite material of the present invention whose position changes according to temperature changes such as a temperature detection member for switching an electric circuit, an AT valve, an electric choke, and various flow control valves for automobiles such as a cab air cleaner. It is widely applied to applications that can use the above action.

  In particular, in the composite material of the present invention, since the first material layer and the second material layer of the composite material are formed of a rubber material, the problem of metal corrosion does not occur. Therefore, the composite material of the present invention can also be applied to uses where conventional bimetals cannot be applied. For example, the cooling water of an internal combustion engine such as an automobile is very corrosive. However, the composite material of the present invention does not cause the problem of metal corrosion. The inventive composite material can be used.

  For example, the composite material of the present invention is suitably used as a fin member for controlling the flow rate of cooling water that is installed in a grooved cooling water flow path of a cylinder block of an internal combustion engine and flows in the grooved cooling water flow path. It is done.

In the internal combustion engine of the present invention, a fin member for controlling the flow rate of the cooling water flowing in the grooved cooling water flow path is installed in the grooved cooling water flow path of the cylinder block of the internal combustion engine.
The fin member is a molded body of the composite material of the present invention;
An internal combustion engine characterized by the above.

  The internal combustion engine of the present invention will be described with reference to FIGS. FIG. 8 is a schematic plan view showing a cylinder block according to the internal combustion engine of the present invention, in a state where no fin member is installed. FIG. 9 is a perspective view of the cylinder block in FIG. FIG. 10 is a schematic diagram showing a cylinder block in which fin members are installed in the groove-shaped cooling water flow path. 11 is a sectional view taken along line xx of FIG. FIG. 12 is a schematic view showing a state in which the fin member is deformed in accordance with a temperature change, and is a view of the grooved cooling water flow path as viewed from above. FIG. 12A is a diagram showing a state when the temperature of the cooling water is low, and FIG. 12B is a diagram showing a state when the temperature of the cooling water is high.

  As shown in FIGS. 8 and 9, the open deck type cylinder block 21 of the vehicle-mounted internal combustion engine is formed with a bore 22 for moving the piston up and down and a grooved cooling water flow path 24 for flowing cooling water. Has been. The wall forming the bore 22 is the cylinder bore wall 23. Further, the cylinder block 21 is formed with a cooling water supply port 25 for supplying cooling water to the grooved cooling water channel 24 and a cooling water discharge port 26 for discharging cooling water from the grooved cooling water channel 24. ing. Of the cylinder bore wall 23, the bore wall between the bore 22 and the adjacent bore 22 is referred to as an inter-bore wall 32, and the groove-like cooling water flow path 24 has a groove shape in the vicinity of the inter-bore wall 32. The cooling water flow path is referred to as an inter-bore wall vicinity 31 of the groove-shaped cooling water flow path.

  As shown in FIGS. 10 and 11, the fin member 29 is disposed in the grooved cooling water channel 24, that is, between the wall surface 27 of the cylinder bore wall and the wall surface 28 of the grooved cooling water channel opposite to the wall surface 27. Installed. In the embodiment shown in FIGS. 12 and 13, the fin member 29 is installed in the grooved coolant flow path 24 by fixing the fixed end 291 of the fin member 29 to the wall surface 28. Further, the free end 292 of the fin member 29 is not fixed anywhere, and the fin member 29 is installed so that the free end 292 of the fin member 29 is located in the vicinity of the inter-bore wall 31 of the grooved cooling water flow path. Has been.

  The fin member 29 is a molded body of the composite material of the present invention. In the fin member 29, the first material layer is disposed on the wall surface 27 side of the cylinder bore wall, and the second material layer is disposed on the wall surface 28 side. Therefore, when the temperature increases, the fin member 29 warps so that the free end 292 approaches the wall surface 27 of the cylinder bore wall.

  In the internal combustion engine, since a plurality of circular bores 22 are formed, the contour of the cylinder bore wall 23 on the grooved coolant flow channel 24 side has a shape in which a plurality of circles overlap each other as shown in FIG. The grooved cooling water flow path 24 is formed in a shape along the contour of the cylinder bore wall 23 on the grooved cooling water flow path 24 side. Therefore, since the cooling water changes its flow at an acute angle in the vicinity of the inter-bore wall 31 of the groove-shaped cooling water flow path, the cooling water tends to stay in the vicinity of the inter-bore wall 31 of the groove-shaped cooling water flow path. . Further, since the bore wall 32 is affected by the combustion heat from both adjacent two bores, the bore wall and the cylinder bore wall in the vicinity thereof have a higher temperature than the other cylinder bore walls. These cause non-uniformity of the wall temperature of the cylinder bore wall.

  FIG. 12 is a schematic view showing a state in which the fin member 29 formed of the composite member of the present invention is deformed in the grooved cooling water flow path 24, and is a view of the grooved cooling water flow path as viewed from above. . FIG. 12A shows a state when the temperature of the cooling water is low, and FIG. 12B shows a state when the temperature of the cooling water is high.

  As shown in FIG. 12 (A), when the temperature of the cooling water is low, the free end 292 of the fin member 29 is located on the wall surface 28 side, so the distance 34 between the free end 292 and the wall surface 27 of the cylinder bore wall is large. It has become. If the distance 34 is large, the flow rate of the cooling water flowing in the vicinity of the wall surface 27 of the cylinder bore wall becomes slow, so the cooling efficiency is low. Further, when the distance 34 is large, as shown in FIG. 12A, most of the cooling water 33 flows through a position away from the vicinity of the inter-bore wall 31 of the groove-shaped cooling water flow path. It becomes difficult to flow into the vicinity 31 between the bore walls of the cooling water flow path. If this state continues, the temperature of the wall surface 27 of the cylinder bore wall increases, and therefore the temperature of the entire cooling water increases.

  When the temperature of the cooling water increases, the temperature of the fin member 29 increases, so that the fin member 29 starts to be deformed so that the free end 292 approaches the wall surface 27 of the cylinder bore wall as shown in FIG. Deform. Therefore, the distance 34 between the free end 292 and the wall surface 27 of the cylinder bore wall is reduced. When the distance 34 is small, the flow rate of the cooling water flowing in the vicinity of the wall surface 27 of the cylinder bore wall is increased, so that the cooling efficiency is increased. Further, when the distance 34 is small, as shown in FIG. 12B, most of the cooling water 33 flows into the vicinity 31 between the bore walls of the grooved cooling water flow path. If this state continues, the temperature of the wall surface 27 of the cylinder bore wall becomes low, so that the temperature of the entire cooling water becomes low.

  When the temperature of the cooling water is lowered, the temperature of the fin member 29 is lowered, so that the fin member 29 is deformed so that the free end 292 is away from the wall surface 27 of the cylinder bore wall. Then, the state returns to the state of FIG. When the state of FIG. 12 (A) continues and the temperature of the entire cooling water rises, the state of FIG. 12 (B) is obtained again. Thereafter, the state of FIG. 12 (A) and the state of FIG. ,Repeated.

  And if the temperature of the whole cooling water becomes too high, it will be in the state of FIG. 12 (B), the wall surface of a cylinder bore wall will be cooled, temperature will fall, and the temperature of cooling water will also become low. Moreover, if the temperature of the whole cooling water becomes too low, it will be in the state of FIG. 12 (A), the temperature of the wall surface of a cylinder bore wall will rise, and the temperature of cooling water will also become high. For this reason, in the internal combustion engine of the present invention, the state of FIG. 12A and the state of FIG. 12B are repeated, so that the temperature of the entire cooling water does not become too high and becomes low. It moves within a certain temperature range. Therefore, the temperature of the wall surface 27 of the cylinder bore wall is kept within a certain temperature range.

  Examples of the rubber material for forming the first material layer and the second material layer of the fin member 29 include ethylene propylene diene rubber (EPDM) and nitrile butadiene rubber (NBR), and ethylene propylene diene rubber (EPDM) has a long life resistance. It is preferable in terms of high coolant resistance (hereinafter also referred to as LLC resistance) and heat resistance. If the rubber material forming the first material layer and the second material layer of the fin member 29 is the above-mentioned rubber, it is -10 ° C to 150 ° C, particularly -40 ° C to 200 ° C in the cooling water flow path. In addition, in a long-term environment of 10 years or longer, the effects of the present invention are exhibited while maintaining sufficient stability, and the problem of corrosion due to LLC does not occur.

  In the embodiment shown in FIGS. 10 and 11, the installation position of the fin member 29 in the vertical direction is substantially the upper half of the grooved coolant flow path 24, and this is because the temperature above the wall surface 27 of the cylinder bore wall is This is because it is efficient to install the fin member 29 on the upper side of the groove-like cooling water flow path 24 because it is higher than the temperature on the lower side. However, the present invention is not limited to this, and the installation position of the fin member 29 is appropriately selected. For example, the fin member 29 is installed over the entire longitudinal direction of the grooved coolant flow path 24. It may be a form.

  The installation method of the fin member 29 is not particularly limited. For example, in order to control the flow of the cooling water in the grooved cooling water channel 24, the fin member 29 is attached to the spacer installed in the grooved cooling water channel 24. Examples of the fixing method include a method of fixing the fixed end of the fin member 29 to the support member, and a method of installing the support member in the grooved cooling water flow path 24.

  In the embodiment shown in FIGS. 10 and 11, four fin members are installed in the cylinder block. The number of fin members is appropriately selected in consideration of the number of bores, cooling efficiency, and the like.

  The internal combustion engine of the present invention is an internal combustion engine in which a fin member, which is a molded body of the composite material of the present invention, is installed in a groove-like cooling water flow path of a cylinder block. In addition, it has a piston, a cylinder head, a head gasket, and the like.

  In the internal combustion engine of the present invention, the method for installing the fin member in the groove-shaped cooling water flow path of the cylinder block is not particularly limited. For example, in order to control the flow of the cooling water in the lower part of the groove-shaped cooling water flow path And a method of fixing the fixed end side of the fin member to the spacer installed in the middle and lower part of the groove-like cooling water flow path, a method of fixing the upper part of the fixed end of the fin member to the cylinder head, and the like.

  The automobile of the present invention is an automobile having the internal combustion engine of the present invention.

(Numerical hydrodynamic analysis)
(I) when the fin member is deformed so that the distance between the free end 292 and the wall surface 27 of the cylinder bore wall is 1.5 mm; and (ii) the distance between the free end 292 and the wall surface 27 of the cylinder bore wall is 6.7 mm. A known computational fluid dynamics analysis was performed when the fin member was deformed so that The result is shown in FIG.

  According to the present invention, since the difference in deformation amount between the upper side and the lower side of the cylinder bore wall of the internal combustion engine can be reduced, the friction of the piston can be reduced, so that a fuel-saving internal combustion engine can be provided.

1a, 1b, 1c Composite material 2 First material layer 3 Second material layer 4 Deformation amount 5 First material layer thickness 6 Second material layer thickness 7 Composite material thickness 8 Fixed object 10a Bimetal material 11 Composite material A direction perpendicular to the side of the fixed end when viewed in plan 12 A direction parallel to the side of the fixed end when viewed from the top of the composite material 21 Cylinder block 22 Bore 23 Cylinder bore wall 24 Grooved coolant flow path 25 Cooling Water supply port 26 Cooling water discharge port 27 Wall surface 28 of cylinder bore wall 23 Wall surface 29 of grooved cooling water flow channel 24 opposite to cylinder bore wall 23 Fin member 31 Neighborhood of bore wall 32 of grooved cooling water flow channel 34 Bore wall 34 Distance 91,291 between free end 292 and wall surface 27 of cylinder bore wall Fixed end 92,292 Free end

Claims (6)

A first material layer and the second material layer are joined via the reinforcement material,
The first material layer and the second material layer are both formed of a rubber material,
Of the rubber material forming the first material layer and the rubber material forming the second material layer, at least the rubber material forming the second material layer contains an inorganic powder,
Since the content or type of inorganic powder in the rubber material forming the first material layer and the rubber material forming the second material layer is different, the second material layer is compared with the linear expansion coefficient of the first material layer. The linear expansion coefficient of the material layer has increased ,
Reinforcing material, bimetal member der Rukoto the two metals material linear expansion coefficient is different are bonded directly or via an intermediate metal layer,
A composite material characterized by   The composite material according to claim 1, wherein the rubber material forming the first material layer and the second material layer is ethylene propylene diene rubber.   The inorganic powder contained in any one or both of the rubber material forming the first material layer and the rubber material forming the second material layer is any one of carbon powder and silica powder, or The composite material according to claim 1, wherein there are two kinds. Is installed in a groove-like cooling water channel of a cylinder block of an internal combustion engine, any one of claims 1-3, characterized in that the fin member for controlling the flow rate of cooling water flowing through the groove-like cooling water channel The composite material according to Item 1. A fin member for controlling the flow rate of the cooling water flowing in the grooved cooling water flow path is installed in the grooved cooling water flow path of the cylinder block of the internal combustion engine,
The fin member is the composite material according to any one of claims 1 to 4.
An internal combustion engine characterized by the above. An automobile having the internal combustion engine according to claim 5 .