JP2012112245A - Heat retaining structure for cylinder bore wall, internal combustion engine, and automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internal combustion engine with high homogeneity of wall temperature of a cylinder bore wall.SOLUTION: The heat retaining structure 1a for a cylinder bore wall installed in a groove-like cooling water channel of a cylinder block of an internal combustion engine comprises a fixed plate 21, a frame member 22 fixed on the fixed plate 21 and having a cylinder bore wall contacted surface 19 contacted on the wall surface of the cylinder bore wall on the groove-like cooling water channel side for surrounding the periphery of a cooling water storage part, or a closely contacted member fixed on the fixed plate 21 and having a cylinder bore wall contacted surface contacted with the wall surface of the cylinder bore wall on the groove-like cooling water channel side for covering the entirety of the heat retaining portion of the wall surface of the cylinder bore wall, an elastic member 24 for energizing the fixed plate 21 to the cylinder bore wall direction, and a temperature deformable member 23 to make the fixed plate 21 move in a direction away from the cylinder bore wall in the case the temperature of the cooling water is raised.

Description

  The present invention relates to a heat retaining structure disposed in contact with a wall surface of a cylinder bore wall of a cylinder block of an internal combustion engine on the groove-like cooling water flow path side, an internal combustion engine including the same, and an automobile having the internal combustion engine.

  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 thermal deformation between the upper side and the lower side of the cylinder bore wall.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a heat retaining structure having high uniformity in wall temperature of a cylinder bore wall, an internal combustion engine including the same, and an automobile having the internal combustion engine.

  As a result of intensive research to solve the problems in the prior art, the present inventors have added a heat retaining structure to the heat retaining structure for retaining the wall surface of the cylinder bore wall by contacting the wall surface of the cylinder bore wall. The elastic member that urges in the cylinder bore wall direction or the elastic member that urges the heat retaining structure away from the cylinder bore wall, and the heat retaining structure deforms to move away from the cylinder bore wall when the temperature of the cooling water increases. When the temperature of the cooling water is low, the heat retaining structure to which the temperature deforming member is attached is pressed against the wall surface of the cylinder bore wall by the elastic member or the temperature deforming member and comes into contact with the wall surface of the cylinder bore wall. On the other hand, when the temperature of the cooling water is high, the heat retaining structure is separated from the cylinder bore wall by the action of the temperature deformation member. Therefore, it has been found that the coolant flows near the wall surface of the cylinder bore wall, the wall surface of the cylinder bore wall is cooled, and the temperature and the temperature of the wall surface of the cylinder bore wall can be maintained within a certain temperature range by these actions and effects. The present invention has been completed.

That is, the present invention (1) is installed in a groove-like cooling water flow path of a cylinder block of an internal combustion engine,
A fixed plate,
A cylinder bore wall contact surface that is fixed to the fixed plate and is in contact with the wall surface of the cylinder bore wall on the grooved cooling water flow path side, and that is fixed to the frame member that surrounds the periphery of the cooling water retaining portion, or the fixed plate, and has a grooved cooling water flow A contact member that has a cylinder bore wall contact surface that is in contact with the wall surface of the cylinder bore wall on the road side, and that covers the entire heat retaining portion of the wall surface of the cylinder bore wall;
An elastic member for urging the fixing plate toward the cylinder bore wall;
A temperature deformation member that is deformed so that the fixing plate moves in a direction away from the cylinder bore wall when the temperature of the cooling water increases;
The present invention provides a heat insulating structure for a cylinder bore wall, characterized by comprising:

Further, the present invention (2) is installed in a groove-like cooling water passage of a cylinder block of an internal combustion engine,
A fixed plate,
A cylinder bore wall contact surface that is fixed to the fixed plate and is in contact with the wall surface of the cylinder bore wall on the grooved cooling water flow path side, and that is fixed to the frame member that surrounds the periphery of the cooling water retaining portion, or the fixed plate, and has a grooved cooling water flow A contact member that has a cylinder bore wall contact surface that is in contact with the wall surface of the cylinder bore wall on the road side, and that covers the entire heat retaining portion of the wall surface of the cylinder bore wall;
An elastic member for urging the fixing plate in a direction away from the cylinder bore wall;
A temperature deformation member that is deformed so that the fixing plate moves in a direction away from the cylinder bore wall when the temperature of the cooling water increases;
The present invention provides a heat insulating structure for a cylinder bore wall, characterized by comprising:

  In addition, the present invention (3) provides an internal combustion engine characterized in that the heat insulation structure of the cylinder bore wall of the present invention (1) or (2) is installed in a grooved cooling water flow path of a cylinder block. To do.

  Moreover, this invention (4) provides the motor vehicle characterized by having the internal combustion engine of this invention (3).

  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.

It is a typical top view showing the state where the thermal insulation structure of the cylinder bore wall of the 1st form example of the present invention (1) is installed in the cylinder block. It is the xx sectional view taken on the line of FIG. It is a perspective view of the cylinder block in FIG. It is a typical front view of the thermal insulation structure of the cylinder bore wall of the 1st form example of this invention (1). It is a typical back view of the thermal insulation structure of the cylinder bore wall of the 1st form example of this invention (1). It is a typical top view of the heat retention structure of the cylinder bore wall of the 1st form example of this invention (1). It is xx end elevation of FIG. FIG. 5 is a yy end view of FIG. 4. It is a typical end view which shows a mode that a temperature deformation member deform | transforms. It is a typical side view which shows a mode that the thermal insulation structure of the cylinder bore wall of the 1st example of this invention (1) moves within a groove-shaped cooling water flow path. FIG. 3 is a schematic end view showing a state where the heat retaining structure of the cylinder bore wall according to the first embodiment of the present invention moves in the grooved cooling water flow path. It is a schematic diagram which shows the flow of the cooling water when a frame member is in contact with the cylinder bore wall. It is a schematic diagram which shows the flow of the cooling water when the frame member is separated from the cylinder bore wall. It is a typical front view of the thermal insulation structure of the cylinder bore wall of the 2nd form example of this invention (1). It is xx end elevation of FIG. It is a typical side view which shows a mode that the thermal insulation structure of the cylinder bore wall of the 3rd form example of this invention (2) moves within a groove-shaped cooling water flow path.

The heat insulation structure of the cylinder bore wall of the present invention (1) is installed in a groove-like cooling water passage of a cylinder block of an internal combustion engine,
A fixed plate,
A cylinder bore wall contact surface that is fixed to the fixed plate and is in contact with the wall surface of the cylinder bore wall on the grooved cooling water flow path side, and that is fixed to the frame member that surrounds the periphery of the cooling water retaining portion, or the fixed plate, and has a grooved cooling water flow A contact member that has a cylinder bore wall contact surface that is in contact with the wall surface of the cylinder bore wall on the road side, and that covers the entire heat retaining portion of the wall surface of the cylinder bore wall;
An elastic member for urging the fixing plate toward the cylinder bore wall;
A temperature deformation member that is deformed so that the fixing plate moves in a direction away from the cylinder bore wall when the temperature of the cooling water increases;
It is the heat insulation structure of the cylinder bore wall characterized by having.

  A heat retaining structure for a cylinder bore wall according to the present invention (1) and an internal combustion engine according to the present invention will be described with reference to FIGS. FIG. 1 is a schematic plan view showing a state where a heat retaining structure for a cylinder bore wall according to a first embodiment of the present invention (1) is installed in a cylinder block. FIG. 2 is a sectional view taken along line xx of FIG. 3 is a perspective view of the cylinder block shown in FIG. FIG. 4 is a schematic front view of the cylinder bore wall heat retaining structure according to the first embodiment of the present invention (1), as viewed from the side in contact with the cylinder bore wall. FIG. 5 is a schematic rear view of the heat retaining structure for the cylinder bore wall according to the first embodiment of the present invention (1), as viewed from the side opposite to the side in contact with the cylinder bore wall. FIG. 6 is a schematic plan view of the heat insulation structure of the cylinder bore wall according to the first embodiment of the present invention (1). FIG. 7 is an end view of FIG. 4 taken along line xx. FIG. 8 is an end view of FIG. 4 taken along the line yy. FIG. 9 is a schematic end view showing a state where the temperature deformation member is deformed, FIG. 9A is a state before the temperature deformation member is deformed, and FIG. 9B is a temperature deformation member. It is a state after is deformed. FIG. 10: is a typical side view which shows a mode that the thermal insulation structure of the cylinder bore wall of the 1st example of this invention (1) moves within a groove-shaped cooling water flow path, FIG. FIG. 10B shows a state before the temperature deforming member is deformed, and FIG. 10B shows a state after the temperature deforming member is deformed. FIG. 11 is a schematic end view showing a state where the heat retaining structure of the cylinder bore wall according to the first embodiment of the present invention (1) moves in the grooved cooling water flow path. Is a state before the temperature deforming member is deformed, and FIG. 11B is a state after the temperature deforming member is deformed. FIG. 12 is a schematic diagram showing the flow of cooling water when the frame member is in contact with the cylinder bore wall, and FIG. 12A is a plan view of the heat retaining structure viewed from above, and FIG. ) Is an end view when the heat insulation structure is cut in the horizontal direction. FIG. 13 is a schematic view showing the flow of cooling water when the frame member is separated from the cylinder bore wall, and FIG. 13 (A) is a plan view of the heat retaining structure viewed from the upper side. B) is an end view when the heat retaining structure is cut in the horizontal direction. FIG. 14 is a schematic front view of a cylinder bore wall heat retaining structure according to the second embodiment of the present invention (1), as viewed from the side in contact with the cylinder bore wall. FIG. 15 is an end view taken along line xx of FIG. For convenience of explanation, FIGS. 1, 12 and 13 show only the fixing plate and the frame member of the heat insulating structure, and FIG. 9 shows only the fixing plate and the shape changing member of the heat insulating structure. In FIG. 10, the description of the fixing plate and the frame member that are visible behind the position of the right side surface of the frame member is omitted, and in FIG. 2, the description of the lower part from the two-dot chain line is omitted. Moreover, in FIG.10 and FIG.11, the wall surface 17 and the wall surface 18 showed with the perpendicular | vertical example.

  As shown in FIGS. 1 to 3, an open deck type cylinder block 11 of an internal combustion engine mounted on a vehicle on which a heat retaining structure 1 a is installed has a bore 12 for moving a piston up and down, and a coolant for flowing water. A grooved cooling water flow path 14 is formed. A wall that separates the bore 12 and the grooved coolant flow path 14 is a cylinder bore wall 13. Further, the cylinder block 11 is formed with a cooling water supply port 15 for supplying cooling water to the grooved cooling water flow channel 11 and a cooling water discharge port 16 for discharging cooling water from the grooved cooling water flow channel 11. ing. And the heat insulation structure 1a is installed in the groove-shaped cooling water flow path 14, that is, between the wall surface 17 of the cylinder bore wall and the wall surface 18 of the groove-shaped cooling water flow path opposite to the wall surface 17.

  As shown in FIGS. 4 to 8, the heat retaining structure 1 a includes a fixed plate 21, a frame member 22 fixed to the fixed plate 21, a temperature deformation member 23, and an elastic member 24.

  The fixed plate 21 is an arc-shaped metal plate in plan view, and is a member to which the frame member 22, the temperature deformation member 23, and the elastic member 24 are fixed. The shape of the fixed plate 21 when viewed from above and below is such that the heat retaining structure 1a is accommodated in the grooved cooling water flow path 14, and the cylinder bore wall contact surface 19 of the frame member 22 is in contact with the wall surface 17 of the cylinder bore wall. The arcuate shape corresponds to the shape of the groove-shaped cooling water flow path 14 so as to be able to. Further, the shape of the fixing plate 21 when viewed from the wall surface side of the cylinder bore wall and the opposite side thereof is not particularly limited as long as the frame member 22, the temperature deformation member 23, and the elastic member 24 can be fixed.

  The material of the fixing plate 21 is not particularly limited, but stainless steel (SUS), aluminum alloy, and the like are preferable in terms of good long life coolant resistance (hereinafter referred to as “LLC resistance”) and high strength. .

  The thickness of the fixing plate 21 is not particularly limited, and is appropriately selected depending on the strength of the heat retaining structure 1a, the width of the grooved cooling water flow path, the required water flow flow path cross-sectional area, and the like.

  The frame member 22 is a member that contacts the wall surface 17 of the cylinder bore wall, and has a cylinder bore wall contact surface 19 that contacts the wall surface 17 of the cylinder bore wall on the side opposite to the surface fixed to the fixing plate 21. As shown in FIG. 2, when the cylinder bore wall contact surface 19 is in contact with the wall surface 17 of the cylinder bore wall, a cooling water retention portion 25 is formed by the wall surface 17 of the cylinder bore wall, the fixing plate 21 and the frame member 22. Therefore, the frame member 22 is provided on the surface of the fixed plate 21 with an appropriate thickness so as to surround the cooling water retention portion 25 so that the cooling water retention portion 25 is formed.

  The material of the frame member 22 is not particularly limited, and examples thereof include rubber, foamed rubber and the like, and rubber is preferable in terms of excellent sealing properties and wear prevention.

  Examples of the rubber used as the material of the frame member 22 include ethylene propylene diene rubber (EPDM) and nitrile butadiene rubber (NBR). Among these, ethylene propylene diene rubber (EPDM) is preferable in terms of LLC resistance and heat resistance. If the material of the frame member 22 is the above rubber, it is sufficient in a cooling water flow path at a temperature of −10 ° C. to 150 ° C., particularly −40 ° C. to 200 ° C., and in a long-term environment of 10 years or more. The effects of the present invention can be achieved while maintaining stability, and the problem of corrosion due to LLC does not occur.

  The shape of the frame member 22 and the cylinder bore wall contact surface 19 of the frame member 22 when viewed from the wall surface side of the cylinder bore wall is cooled when viewed from the wall surface side of the cylinder bore wall in the first embodiment shown in FIG. The shape of the outer periphery of the water retention part 25 is a shape that is rectangular, but is not limited to this, and for example, the shape of the outer periphery of the cooling water retention part is a shape such as a circle, an ellipse, a square, or a polygon. Such a shape may be used. Moreover, when the outer peripheral shape of the cooling water retention part 25 is a polygon, the corner | angular may be circular arc shape.

  Further, the width of the frame member 22 may be constant as the width of the cylinder bore wall contact surface 19 of the frame member 22 in the thickness direction as in the first embodiment shown in FIG. The width may increase little by little in the direction.

  The overall shape of the frame member 22 when viewed from above and below is an arc shape corresponding to the shape of the wall surface 17 of the cylinder bore wall and the groove-like cooling water flow path 14. The surface shape of the cylinder bore wall contact surface 19 of the frame member 22 is a shape corresponding to the surface shape of the wall surface 17 of the cylinder bore wall.

  The thickness of the frame member 22 is not particularly limited, and is appropriately selected depending on the design value of the volume of the cooling water retention portion 25, the width of the grooved cooling water flow path, the required water flow flow path cross-sectional area, and the like. The width of the cylinder bore wall contact surface of the frame member 22 is appropriately selected depending on the material of the frame member 22, the contact surface pressure, the sealing property, and the like.

  It should be noted that the volume and position of the cooling water retaining portion 25 formed by the wall surface 17 of the cylinder bore wall, the fixing plate 21 and the frame member 22 do not cause excessive pressure loss due to the engine model, durability conditions, engine combustion region, and so on. Depending on the situation, it is appropriately selected.

  The method of fixing the frame member 22 to the fixing plate 21 is not particularly limited. For example, a method of fixing the frame member 22 with an adhesive, a plurality of through holes are formed in the fixing plate 21, and the holes are formed on the fixing surface side of the frame member 22. For example, a method of engaging and fixing the provided protrusions, caulking with a pawl, and the like can be given.

  The cylinder bore wall contact surface 19 of the frame member 22 does not need to be in close contact with the wall surface 17 of the cylinder bore wall so that the intrusion of the cooling water from the outside into the cooling water retention portion 25 is completely eliminated. When the frame member 22 is in contact with the wall surface 17 of the cylinder bore wall, if the intrusion of the cooling water into the cooling water retention part 25 is suppressed to some extent, the cooling water stays in the cooling water retention part 25, Since it is warmed, the heat retaining effect of the cylinder bore wall can be obtained. Therefore, if the cooling water stays in the cooling water staying part 25 to such an extent that the heat retaining effect of the cylinder bore wall is obtained, the cylinder bore wall contact surface 19 of the frame member 22 in the cooling water staying part 25 and Intrusion of cooling water from the wall surface 17 of the cylinder bore wall is allowed. Then, when the frame member 22 is in contact with the wall surface 17 of the cylinder bore wall, the cooling water is warmed in the cooling water retaining portion 25 so that the cooling water is retained so as to obtain a heat retaining effect on the cylinder bore wall. The material of the frame member 22, the surface shape and width of the cylinder bore wall contact surface 19 and the surface pressure are appropriately selected.

  The elastic member 24 is a member that is fixed to the back side of the fixing plate 21 (the side opposite to the wall surface side of the cylinder bore wall) and biases the frame member 22 toward the wall surface 17 of the cylinder bore wall. That is, the elastic member 24 is a member for continuously pressing the fixing plate 21 toward the wall surface 17 of the cylinder bore wall.

  In the first embodiment shown in FIGS. 4 to 8, the elastic member 24 is a vertically long metal plate having both ends fixed to the fixed plate 24 and bent in an arc shape when viewed from the side. The elastic member 24 of the first embodiment shown in FIGS. 4 to 8 is, for example, longer than the linear distance between the fixed positions of both ends (upper and lower) of the elastic member 24 of the fixing plate 21, and its upper and lower ends are U-shaped. A metal plate processed into an L shape or the like is prepared, the metal plate is bent into an arc shape, and the upper end and the lower end are engaged with slits provided in the fixed plate 21 to be fixed. Note that an arc shape refers to a shape in which curves having a center of curvature radius in the same direction are continuous, such as a shape of a part of a circle or an ellipse.

  In the first embodiment shown in FIG. 4 to FIG. 8, the portion that contacts the wall surface 18 of the elastic member 24 from the contact surface 19 of the cylinder bore wall of the frame member 22 when viewed in the width direction of the grooved cooling channel. The shape of the elastic member 24 is selected such that the length of the elastic member 24 is longer than the width of the groove-shaped cooling channel at the position where the elastic member 24 contacts. Thus, when the heat retaining structure 1a is installed in the groove-shaped cooling channel, the frame member 22 is always urged toward the wall surface 17 of the cylinder bore wall by the action of the elastic member 24.

  The temperature deformation member 23 is fixed to the frame member side of the fixed plate 21, and is a member whose shape changes as the temperature of the cooling water changes. Examples of the material of the temperature deformable member 23 include a bimetal obtained by combining two kinds of metals having different coefficients of thermal expansion. In this case, the bimetal structure is a structure in which a metal having a higher coefficient of thermal expansion is arranged on the fixed plate 21 side and a metal having a lower coefficient of thermal expansion is arranged on the wall surface 17 side of the cylinder bore wall.

  FIG. 9A shows a state when the temperature is low, and FIG. 9B shows a state when the temperature is high. The temperature deformation member 23 is an arc-shaped plate-like member in a side view, but the fixed end 231 is fixed to the fixed plate 21. On the other hand, the free end 232 is not fixed anywhere and is free. Then, as shown in FIGS. 9A and 9B, the temperature deforming member 23 is deformed so as to warp outward when the temperature becomes high. When the temperature becomes high, the temperature deforming member 23 becomes The free end 232 side is deformed in a direction away from the fixed plate 21.

  Therefore, as shown in FIG. 10, when the heat retaining structure 1a is installed in the grooved cooling water flow path 14 and the cooling water is flowed into the grooved cooling water flow path 14, the temperature of the cooling water is low. As shown in FIG. 10A, the frame member 22 is pressed against the wall surface 17 of the cylinder bore wall by the biasing force of the elastic member 24, so that the cylinder bore wall contact surface 19 of the frame member 22 contacts the wall surface 17 of the cylinder bore wall. ing. On the other hand, when the temperature of the cooling water rises, the temperature deformation member 23 is deformed in the direction away from the fixed plate 21 on the free end 232 side, and against the urging force of the elastic member 24 by the deformation, the wall surface of the cylinder bore wall A force that pushes back the fixing plate 21 is generated in a direction away from 17. Then, when the force of pushing back by the temperature deformation member 22 becomes stronger than the biasing force of the elastic member 24, the fixing plate 21 moves away from the cylinder bore wall as shown in FIG. The surface 19 is separated from the wall surface 17 of the cylinder bore wall.

  Thus, the temperature deformation member 23 is a member that deforms the frame member 22 so as to be separated from the wall surface 17 of the cylinder bore wall when the temperature of the cooling water increases.

  The temperature deformation member 23 is not particularly limited as long as the shape is changed by a temperature change. As a material of the temperature deformation member 23, for example, a bimetal obtained by combining two kinds of metal plates having different thermal expansion coefficients, and a shape memory having a property of returning to the original shape even when it is deformed when the temperature is higher than the transformation point. An alloy etc. are mentioned. When a shape memory alloy is used as the temperature deformable member 23, the temperature of the cooling water is obtained by using the shape memory alloy having the shape of FIGS. 9B and 10B at a temperature equal to or higher than the transformation point. When the temperature is lower than the transformation point at a low temperature, the temperature deforming member 23 is deformed into the shape shown in FIGS. 9A and 10A by the urging force of the elastic member 24, but the temperature of the cooling water becomes high. When the temperature is equal to or higher than the transformation point, the shape returns to the shape shown in FIGS. 9B and 10B, and the shape change shown in FIGS. 9 and 10 becomes possible. Moreover, as a material of the temperature deformation member 23, in addition to a metal such as a bimetal or a shape memory alloy, a temperature change similar to that of the bimetal or the shape memory alloy, such as a composite resin material, a composite material of a resin material and a metal material, or the like. Those that can be deformed by are also used.

  In the form examples shown in FIGS. 4 to 8, the shape of the temperature deformable member is an arcuate vertically long plate shape in a side view, but is not limited to this and is appropriately selected. Further, the fixing position and fixing method of the temperature deformation member are appropriately selected.

  In the heat retaining structure 1a, the relationship between the magnitude of the urging force of the elastic member 24 and the magnitude of the force that pushes back the fixing plate 21 by the temperature deforming member 23 indicates that “the urging force of the elastic member 24> when the temperature of the cooling water is low. “The force that pushes back the fixing plate 21 by the temperature deforming member 23”, and when the temperature of the cooling water is high, it is necessary that “the urging force of the elastic member 24 <the force that pushes the fixing plate 21 by the temperature deforming member 23”. A combination of the elastic member 24 and the temperature deformation member 23 is appropriately selected so as to have such a relationship. Also, whether the cylinder bore wall contact surface 19 of the frame member 22 is separated from the wall surface 17 of the cylinder bore wall when the temperature of the cooling water reaches the engine model, the wall temperature of the cylinder bore wall, etc. Is selected as appropriate. Then, the material, shape, fixing position, and the like of the elastic member 24 and the temperature deformation member 23 are selected so that the cylinder bore wall contact surface 19 of the frame member 22 is separated from the wall surface 17 of the cylinder bore wall at the selected temperature. The

  Next, functions and effects of the heat retaining structure 1a will be described. As shown in FIG. 11A, when the temperature of the cooling water is low, the cylinder bore wall contact surface 19 of the frame member 22 is in contact with the wall surface 17 of the cylinder bore wall, so that the cylinder bore wall 17, the frame member 22, and the fixing plate 21, the cooling water retention part 25 is formed. At this time, as shown in FIG. 12, the cooling water 27 flows on the back side of the fixed plate 21, that is, between the fixed plate 21 and the wall surface 18, so that the cooling water flows on the wall surface 18 side, On the wall surface 17 side of the cylinder bore wall, the cooling water does not flow, and the cooling water stays in the cooling water staying portion 25. The cooling water staying in the cooling water staying part 25 is heated by the heat from the cylinder bore wall, and the temperature becomes high. For this reason, when the temperature of the cooling water is low, the wall surface 17 of the cylinder bore wall is kept warm by the cooling water whose temperature has been increased by staying in the cooling water retention portion 25.

  If the state in which the wall surface of the cylinder bore wall is kept warm, that is, if the state in which the cylinder bore wall contact surface 19 is in contact with the wall surface 17 of the cylinder bore wall continues, the temperature of the entire cooling water increases. When the temperature of the cooling water becomes higher than a specific temperature, the deformation of the temperature deformation member 23 causes the cylinder bore wall contact surface 19 of the frame member 22 to move from the wall surface 17 of the cylinder bore wall as shown in FIG. As shown in FIG. 13, the cooling water stays away from the cooling water staying portion 25 and passes through the gap 26 between the cylinder bore wall contact surface 19 of the frame member 22 and the wall surface 17 of the cylinder bore wall. Thus, the cooling water 27 also flows to the wall surface 17 side of the cylinder bore wall. Therefore, the wall surface 17 of the cylinder bore wall is cooled.

  If the cooling water flows toward the wall surface 17 side of the cylinder bore wall and continues to be cooled, that is, if the cylinder bore wall contact surface 19 is separated from the wall surface 17 of the cylinder bore wall, the temperature of the entire cooling water Go down. And if the temperature of cooling water becomes lower than specific temperature, it will return to the shape when the shape of the temperature deformation member 23 is low temperature, and will return to the state of FIG. 11 (A) and FIG. When the state of FIG. 11 (A) and FIG. 12 continues and the temperature of the whole cooling water becomes high, the state of FIG. 11 (B) and FIG. 13 is obtained again, and thereafter the state of FIG. 11 (A) and FIG. The states of FIG. 11B and FIG. 13 are repeated.

  And if the temperature of the whole cooling water becomes too high, it will be in the state of FIG. 11 (B) and FIG. 13, 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. 11 (A) and FIG. 12, the wall surface of a cylinder bore wall will be kept warm, temperature will rise, and the temperature of cooling water will also become high. For this reason, in the heat retaining structure 1a, the state of FIGS. 11 (A) and 12 and the state of FIGS. 11 (B) and 13 are repeated, so that the temperature of the entire cooling water increases. It moves within a certain temperature range that is not too low and not too low. Therefore, the temperature of the wall surface 17 of the cylinder bore wall is kept within a certain temperature range.

  14 and 15 show a cylinder bore wall heat retaining structure 1b according to a second embodiment of the present invention (2). The plan view of the heat retaining structure 1b is the same as FIG. As shown in FIGS. 14 and 15, in the heat retaining structure 1 b, the solid contact member 30 is fixed to the fixing plate 21.

  The solid contact member 30 is a member that contacts the wall surface 17 of the cylinder bore wall, and has a cylinder bore wall contact surface 31 that contacts the wall surface 17 of the cylinder bore wall on the side opposite to the surface fixed to the solid plate 21. The cylinder bore wall contact surface 31 of the solid contact member 30 is in contact with the wall surface 17 of the cylinder bore wall so as to cover the entire heat retaining portion of the wall surface 17 of the cylinder bore wall. That is, in the solid contact member 30, the portion of the cooling water retention portion 25 inside the frame member 22 of the heat retaining structure 1a is also filled with the material of the solid contact member.

  The heat retaining structure 1b is the same as the heat retaining structure 1a except that the solid contact member 30 is fixed to the fixing plate 21 instead of the frame member 22 being fixed to the fixing plate 21. Therefore, the movement of the solid plate 21 and the solid contact member 30 fixed thereto by the action of the temperature deforming member 23 and the elastic member 24 causes the solid plate 21 shown in FIGS. 10 and 11 and the frame member 22 fixed thereto to move. The change in the flow of the cooling water when the solid plate 21 and the contact member 30 are moved is the same as the movement, and the change in the flow of the cooling water when the solid plate 21 and the frame member 22 shown in FIGS. Same as change.

  That is, in the heat retaining structure 1a, the cooling water is retained in the cooling water retaining portion 25, so that the cooling water in the cooling water retaining portion 25 is warmed and the heat retaining portion of the wall surface 17 of the cylinder bore wall is retained. On the other hand, in the heat retaining structure 1b, the solid contact member 30 covers the entire heat retaining portion of the wall surface 17 of the cylinder bore wall, so that the heat retaining portion of the wall surface 17 of the cylinder bore wall is warmed.

  The material of the solid contact member 30 is the same as the material of the frame member 22.

  The shape of the solid contact member 30 when viewed from the wall surface side of the cylinder bore wall is a shape that becomes a rectangle in the second embodiment shown in FIG. The shape may be an ellipse, a square, a polygon, or the like. Moreover, in the case of a polygon, the corner | angular may be circular arc shape.

  The overall shape of the solid contact member 30 when viewed from above and below is an arc shape corresponding to the shapes of the wall surface 17 of the cylinder bore wall and the groove-like cooling water flow path 14. The surface shape of the cylinder bore wall contact surface 31 of the solid contact member 30 is a shape corresponding to the surface shape of the wall surface 17 of the cylinder bore wall.

  The thickness of the solid contact member 30 is not particularly limited, and is appropriately selected depending on the width of the groove-shaped cooling water flow path, the required water flow flow path cross-sectional area, and the like.

  The position of the solid contact member 30 is appropriately selected depending on the model of the engine, the durability condition, the combustion region of the engine, and not causing excessive pressure loss.

  The method of fixing the solid contact member 30 to the fixing plate 21 is not particularly limited. For example, a method of fixing with the adhesive, a plurality of through holes in the fixing plate 21, and the fixing surface of the solid contact member 30 in the hole. A method of engaging and fixing the protrusion provided on the side, caulking with a pawl, and the like can be mentioned.

  The cylinder bore wall contact surface 31 of the solid contact member 30 is in close contact with the wall surface 17 of the cylinder bore wall such that the cooling water does not completely enter between the cylinder bore wall contact surface 31 of the solid contact member 30 and the wall surface 17 of the cylinder bore wall. You don't have to be in touch. When the solid contact member 30 is in contact with the wall surface 17 of the cylinder bore wall, if the contact of the cooling water with the wall surface 17 of the cylinder bore wall is restricted, the heat retaining portion of the wall surface 17 of the cylinder bore wall can be warmed. The heat retention effect is obtained. Therefore, the cooling water is allowed to enter between the cylinder bore wall contact surface 31 of the solid contact member 30 and the wall surface 17 of the cylinder bore wall as long as the heat retaining effect of the cylinder bore wall is obtained. Then, when the solid contact member 30 is in contact with the wall surface 17 of the cylinder bore wall, the material of the solid contact member 30, the surface shape and width of the cylinder bore wall contact surface 31, and the surface pressure are obtained so as to obtain the heat retaining effect of the cylinder bore wall. Etc. are appropriately selected.

Thus, the heat insulation structure of the cylinder bore wall of the present invention (1) is installed in the groove-like cooling water flow path of the cylinder block of the internal combustion engine,
A fixed plate,
A cylinder bore wall contact surface that is fixed to the fixed plate and is in contact with the wall surface of the cylinder bore wall on the grooved cooling water flow path side, and that is fixed to the frame member that surrounds the periphery of the cooling water retaining portion, or the fixed plate, and has a grooved cooling water flow A contact member that has a cylinder bore wall contact surface that is in contact with the wall surface of the cylinder bore wall on the road side, and that covers the entire heat retaining portion of the wall surface of the cylinder bore wall;
An elastic member for urging the fixing plate toward the cylinder bore wall;
A temperature deformation member that is deformed so that the fixing plate moves in a direction away from the cylinder bore wall when the temperature of the cooling water increases;
It is the heat insulation structure of the cylinder bore wall characterized by having. In the following, the same points as those of the heat insulation structure of the first embodiment of the present invention (1) and the heat insulation structure of the second embodiment of the present invention (1) will be described. The description of the heat retaining structure of one embodiment and the heat retaining structure of the second embodiment of the present invention (1) is referred to and the description is omitted.

  The cylinder bore wall heat retaining structure of the present invention (1) includes a fixed plate, a frame member or a solid contact member fixed to the fixed plate, a temperature deforming member, and an elastic member.

  The fixing plate is the same as the fixing plate 21 described in the first embodiment of the present invention (1). The frame member is the same as the frame member 22 described in the first embodiment of the present invention (1). Further, the solid contact member is the same as the solid contact member 30 described in the second embodiment of the present invention (1).

  The elastic member according to the heat retaining structure of the cylinder bore wall of the present invention (1) is a member that urges the fixing member toward the wall surface of the cylinder bore wall, and the elastic member always moves the fixing plate toward the wall surface of the cylinder bore wall. The elastic member is not particularly limited as long as it can urge the fixing plate in the direction of the wall surface of the cylinder bore wall. Other than these, for example, a coiled spring or the like can be used. The material of the elastic member is not particularly limited as long as it is a material having corrosion resistance to cooling water.

  The temperature deformation member according to the heat retaining structure for the cylinder bore wall of the present invention (1) is a member whose shape changes as the temperature of the cooling water changes. When the temperature of the cooling water increases, the fixing plate becomes the cylinder bore wall. Since the member is deformed so as to move away from the wall surface, the temperature deforming member is not particularly limited as long as it undergoes such deformation, and those described in the first embodiment can be cited. It is done.

  The material, shape, fixing method, fixing position, etc. of the elastic member and temperature change member are such that when the temperature of the cooling water is low, the cylinder bore wall contact surface of the frame member or the solid contact member is in contact with the wall surface of the cylinder bore wall, and If the temperature of the cooling water increases, the fixing plate is not particularly limited as long as the fixing plate can be moved away from the wall surface of the cylinder bore wall. When the temperature of the cooling water is low, the urging force of the elastic member> the force of pushing back the fixing plate by the temperature deforming member. When the temperature of the cooling water is high, the urging force of the elastic member <the fixing plate by the temperature deforming member. The elastic member and the temperature deformation member are appropriately selected so as to have a “force to push back”. Whether the cylinder bore wall contact surface of the frame member or solid contact member is separated from the wall surface of the cylinder bore wall when the temperature of the cooling water reaches the engine model, the wall surface temperature of the cylinder bore wall. Etc. are selected as appropriate. Then, the combination of the elastic member and the temperature deformation member is selected so that the cylinder bore wall contact surface of the frame member or the solid contact member is separated from the wall surface of the cylinder bore wall at that temperature.

The heat insulation structure of the cylinder bore wall of the present invention (2) is installed in a groove-like cooling water passage of a cylinder block of an internal combustion engine,
A fixed plate,
A cylinder bore wall contact surface that is fixed to the fixed plate and is in contact with the wall surface of the cylinder bore wall on the grooved cooling water flow path side, and that is fixed to the frame member that surrounds the periphery of the cooling water retaining portion, or the fixed plate, and has a grooved cooling water flow A contact member that has a cylinder bore wall contact surface that is in contact with the wall surface of the cylinder bore wall on the road side, and that covers the entire heat retaining portion of the wall surface of the cylinder bore wall;
An elastic member for urging the fixing plate in a direction away from the cylinder bore wall;
A temperature deformation member that is deformed so that the fixing plate moves in a direction away from the cylinder bore wall when the temperature of the cooling water increases;
It is the heat insulation structure of the cylinder bore wall characterized by having.

  As a form example of the heat insulation structure of the cylinder bore wall of the present invention (2), the temperature deformation member 23 and the elastic member 24 of the heat insulation structure 1a shown in FIGS. 4 to 8 or the heat insulation structure 1b shown in FIGS. The fixing member 21 is fixed to the opposite side of the fixing plate 21, that is, the elastic member 24 is fixed to the surface side of the fixing plate 21 to which the frame member 22 or the solid contact member 30 is fixed. An example in which the temperature deformation member 23 is fixed on the back side of the (also referred to as a third example) is given.

  In the third embodiment of the cylinder bore wall heat retaining structure of the present invention (2), the elastic member 24 is a member that urges the fixing plate in a direction away from the wall surface of the cylinder bore wall. That is, the elastic member is a member for constantly pressing the fixing plate in the direction away from the direction of the wall surface 17 of the cylinder bore wall.

  Further, in the third embodiment of the cylinder bore wall heat retaining structure of the present invention (2), when the temperature of the cooling water is low, the temperature deforming member 23 is located at the farthest free end side, and the temperature of the cooling water Becomes higher, the free end is deformed in a direction approaching the fixed plate 21. Examples of such a temperature deforming member that deforms include a bimetal in which a metal having a lower coefficient of thermal expansion is arranged on the fixed plate 21 side and a metal having a higher coefficient of thermal expansion is arranged on the wall surface 18 side.

  In the third embodiment of the cylinder bore wall heat retaining structure of the present invention (2), when the temperature of the cooling water is low, the temperature deforming member 23 pushes the fixing plate 21 as shown in FIG. When the force is stronger than the urging force by the elastic member 24 and the temperature of the cooling water is high, the temperature deforming member 23 is connected to the free end of the temperature deforming member 23 and the fixing plate 21 as shown in FIG. The temperature deformation member 23 and the elastic member 24 are selected so as to be deformed so as to shorten the distance. Thus, in the third embodiment of the cylinder bore wall heat retaining structure of the present invention (2), when the temperature of the cooling water is low, the temperature deforming member 23 is fixed to the fixed plate 21 as shown in FIG. When the cylinder bore wall contact surface of the frame member 22 (solid contact member 30) is in contact with the wall surface 17 of the cylinder bore wall and the temperature of the cooling water is high, the temperature deformation member 23 moves between the free end and the fixed plate 21. By deforming to shorten the distance, the fixing plate 21 is moved away from the wall surface 17 of the cylinder bore wall by the urging force of the elastic member 24, and the cylinder bore wall contact surface of the frame member 22 (solid contact member 30) is moved. , Away from the wall surface 17 of the cylinder bore wall.

  The change in the flow of the cooling water due to the movement of the fixing plate and the frame member or the solid contact member of the heat retaining member of the cylinder bore wall of the present invention (2) in the grooved cooling water flow path is the cylinder bore wall of the present invention (1). This is the same as the change in the flow of the cooling water due to the movement of the fixing plate and the frame member or the solid contact member of the heat retaining member in the grooved cooling water flow path.

  The internal combustion engine of the present invention is an internal combustion engine characterized in that the heat retaining member of the cylinder bore wall of the present invention (1) or (2) is installed in a groove-like cooling water flow path of a cylinder block. The internal combustion engine of the present invention includes a piston, a cylinder head, a head gasket and the like in addition to the cylinder block and the heat retaining structure.

  In FIG. 1, one heat retaining structure is installed in the cylinder block, but two or more heat retaining structures may be installed. Further, the installation position of the heat retaining structure is appropriately selected.

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

  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 Thermal insulation structure 11 Cylinder block 12 Bore 13 Cylinder bore wall 14 Groove cooling water flow path 15 Cooling water supply port 16 Cooling water discharge port 17 Wall surface 18 of cylinder bore wall 13 Groove cooling water flow path on the opposite side to cylinder bore wall 13 14 Wall surface 19 Cylinder bore wall contact surface 21 of frame member 22 Fixed plate 22 Frame member 23 Temperature deformation member 24 Elastic member 25 Cooling water retention portion 26 Clearance 27 Cooling water 30 Solid contact member 31 Cylinder bore wall contact surface 231 of solid contact member 30 Fixed end 232 Free end

Claims (8)

Installed in the grooved coolant flow path of the cylinder block of the internal combustion engine,
A fixed plate,
A cylinder bore wall contact surface that is fixed to the fixed plate and is in contact with the wall surface of the cylinder bore wall on the grooved cooling water flow path side, and that is fixed to the frame member that surrounds the periphery of the cooling water retaining portion, or the fixed plate, and has a grooved cooling water flow A contact member that has a cylinder bore wall contact surface that is in contact with the wall surface of the cylinder bore wall on the road side, and that covers the entire heat retaining portion of the wall surface of the cylinder bore wall;
An elastic member for urging the fixing plate toward the cylinder bore wall;
A temperature deformation member that is deformed so that the fixing plate moves in a direction away from the cylinder bore wall when the temperature of the cooling water increases;
A heat insulating structure for a cylinder bore wall, characterized by comprising: The fixing plate is an arc-shaped metal plate in plan view,
The elastic member is a metal plate having both ends fixed to the fixing plate and bent in an arc shape in a side view,
The temperature deforming member is a plate-like member whose fixed end is fixed to the fixing plate and the free end side is deformed in a direction away from the fixing plate when the temperature of the cooling water increases.
The heat insulating structure for a cylinder bore wall according to claim 1. Installed in the grooved coolant flow path of the cylinder block of the internal combustion engine,
A fixed plate,
A cylinder bore wall contact surface that is fixed to the fixed plate and is in contact with the wall surface of the cylinder bore wall on the grooved cooling water flow path side, and that is fixed to the frame member that surrounds the periphery of the cooling water retaining portion, or the fixed plate, and has a grooved cooling water flow A contact member that has a cylinder bore wall contact surface that is in contact with the wall surface of the cylinder bore wall on the road side, and that covers the entire heat retaining portion of the wall surface of the cylinder bore wall;
An elastic member for urging the fixing plate in a direction away from the cylinder bore wall;
A temperature deformation member that is deformed so that the fixing plate moves in a direction away from the cylinder bore wall when the temperature of the cooling water increases;
A heat insulating structure for a cylinder bore wall, characterized by comprising: The fixing plate is an arc-shaped metal plate in plan view,
The elastic member is a metal plate having both ends fixed to the fixing plate and bent in an arc shape in a side view,
The temperature deforming member is a plate-like member whose fixed end is fixed to the fixed plate and the free end side is deformed in a direction approaching the fixed plate when the temperature of cooling water increases.
The heat insulating structure for a cylinder bore wall according to claim 1.   6. The heat retaining structure for a cylinder bore wall according to claim 1, wherein the temperature deformable member is a bimetal or a shape memory alloy.   The said frame member or the said solid contact member consists of rubber materials, The heat retention structure of the cylinder bore wall of any one of Claims 1-5 characterized by the above-mentioned.   An internal combustion engine in which the cylinder bore wall heat insulation structure according to any one of claims 1 to 6 is installed in a grooved coolant flow path of a cylinder block.   An automobile having the internal combustion engine according to claim 7.