JP2015203313A - Heat insulating tool for cylinder bore wall, internal combustion engine, and automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internal combustion engine of which a cylinder bore wall has a highly uniform wall temperature.SOLUTION: A heat insulating tool for the cylinder bore wall includes a heat insulating rubber member 22 for contacting the wall face on the single-side half side out of all wall faces on the cylinder bore side of the middle lower part of a grooved cooling water flow path 14, the heat insulating rubber member having a contact-face-side shape along the wall face on the cylinder bore side of the middle lower part of the grooved cooling water flow path, a metal substrate member 21 to which the heat insulating rubber member is fixed, and elastic members 23 attached to the metal substrate member for energizing the metal substrate member to push the heat insulating rubber member against the wall face on the cylinder bore side of the middle lower part of the grooved cooling water flow path.

Description

  The present invention relates to a heat retaining device disposed in contact with a wall surface on the grooved coolant flow path side of a cylinder bore wall of a cylinder block of an internal combustion engine, 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, Patent Document 1 discloses a flow that divides a groove-shaped cooling heat medium flow path into a plurality of flow paths by being disposed 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 a depth of the groove-shaped cooling heat medium flow path, and a bore-side flow path and an anti-bore-side flow path in the groove-shaped cooling heat medium flow path A flow path dividing member serving as a wall portion that is divided into a groove portion, a groove portion that is formed from the flow path dividing member toward the opening of the groove-shaped cooling heat medium flow channel, and a leading edge is the groove-shaped cooling heat medium. By being formed of a flexible material so as to extend beyond one inner surface of the flow path, the end edge portion is caused by its own bending restoring force after completion of insertion into the grooved cooling heat medium flow path. By contacting the inner surface at the intermediate position in the depth direction of the grooved cooling heat medium flow path, A flexible lip member that separates the A-side passage, the internal combustion engine cooling heat medium flow passage partition member comprising the disclosed.

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.

  Accordingly, an object of the present invention is to provide an internal combustion engine in which the wall temperature of the cylinder bore wall is highly uniform.

  As a result of intensive research to solve the problems in the conventional technology, the present inventors have installed a heat-insulating rubber member for keeping the cylinder bore wall in contact with the cylinder bore wall on the grooved coolant flow channel side. Thus, the present inventors have found that the wall temperature of the cylinder bore wall can be made uniform by preventing the cooling water from directly contacting the cylinder bore wall, and the present invention has been completed.

That is, the present invention (1) is a cylinder bore wall for keeping the bore wall of one half of the bore walls of all the cylinder bores installed in the lower part of the groove-like cooling water flow path of the cylinder block of the internal combustion engine having the cylinder bore. The warmer of the
Of the entire wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path, the wall surface on one half side is in contact with the shape on the cylinder bore side in the lower part of the grooved cooling water flow path. A heat insulating rubber member, a metal base member to which the heat insulating rubber member is fixed, and fixed to the back side of the metal base member, toward the wall surface on the cylinder bore side in the lower part of the grooved cooling water channel, The metal base member is urged to press the heat retaining rubber member, and the cooling water flow between the metal base member and the wall surface on the opposite side to the wall surface on the cylinder bore side in the lower part of the grooved cooling water flow path is An urging and back side flow suppressing member for suppressing,
The heat retaining rubber member includes a heat retaining rubber member end bore for keeping the bore wall of the end bore at one end, a heat retaining rubber member end bore for keeping the bore wall of the end bore at the other end, Or a heat retaining rubber member end bore for keeping the bore wall of the end bore at one end, and a heat retaining rubber member end bore for keeping the bore wall of the other end bore. A heat insulation rubber member intermediate bore portion for keeping the respective bore walls of the intermediate bore, and
The metal base member is connected from the bore wall side of the end bore at one end to the bore wall side of the end bore at the other end,
One or more of the urging and back side flow suppressing members are provided for each of the bore portions of the metal base member end bore portion and the metal base member intermediate bore portion,
A cylinder bore wall heat insulator characterized by the above is provided.

Further, the present invention (2) is installed in the middle and lower part of the groove-like cooling water flow path of the cylinder block of the internal combustion engine having three or more cylinder bores, and keeps the bore wall of one half of the bore walls of all the cylinder bores. A cylinder bore wall heat insulator for
Of the entire wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path, the wall surface on one half side is in contact with the shape on the cylinder bore side in the lower part of the grooved cooling water flow path. A heat insulating rubber member, a metal base member to which the heat insulating rubber member is fixed, and fixed to the back side of the metal base member, toward the wall surface on the cylinder bore side in the lower part of the grooved cooling water channel, The metal base member is urged to press the heat retaining rubber member, and the cooling water flow between the metal base member and the wall surface on the opposite side to the wall surface on the cylinder bore side in the lower part of the grooved cooling water flow path is An urging and back side flow suppressing member for suppressing,
The heat retaining rubber member includes a heat retaining rubber member end bore for keeping the bore wall of the end bore at one end, a heat retaining rubber member end bore for keeping the bore wall of the end bore at the other end, A heat retaining rubber member intermediate bore portion for keeping warm each bore wall of the one or more intermediate bores,
The metal base member is connected from the bore wall side of the end bore at one end to the bore wall side of the end bore at the other end,
One or more of the urging and back side flow suppressing members are provided for each of the bore portions of the metal base member end bore portion and the metal base member intermediate bore portion,
(1) A cylinder bore wall heat insulator characterized by the above.

Further, the present invention (3) is installed in the middle and lower part of the groove-like cooling water flow path of the cylinder block of the internal combustion engine having two cylinder bores, and keeps the bore wall of one half of the bore walls of all the cylinder bores. Cylinder bore wall insulation,
Of the entire wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path, the wall surface on one half side is in contact with the shape on the cylinder bore side in the lower part of the grooved cooling water flow path. A heat insulating rubber member, a metal base member to which the heat insulating rubber member is fixed, and fixed to the back side of the metal base member, toward the wall surface on the cylinder bore side in the lower part of the grooved cooling water channel, The metal base member is urged to press the heat retaining rubber member, and the cooling water flow between the metal base member and the wall surface on the opposite side to the wall surface on the cylinder bore side in the lower part of the grooved cooling water flow path is An urging and back side flow suppressing member for suppressing,
The heat insulating rubber member is composed of a heat insulating rubber member end bore portion for keeping the bore wall of the end bore at one end, and a heat insulating rubber member end bore portion for keeping the bore wall of the end bore at the other end,
The metal base member is connected from the bore wall side of the end bore at one end to the bore wall side of the end bore at the other end,
One or more of the urging and back side flow suppressing members are provided for each metal base member end bore portion,
(1) A cylinder bore wall heat insulator characterized by the above.

Further, the present invention (4) is a cylinder bore wall that is installed in the middle and lower part of a groove-like cooling water flow path of a cylinder block of an internal combustion engine having a cylinder bore and keeps the bore wall of one half of the bore walls of all the cylinder bores. The warmer of the
Of the entire wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path, the wall surface on one half side is in contact with the shape on the cylinder bore side in the lower part of the grooved cooling water flow path. A heat insulating rubber member, a metal base member to which the heat insulating rubber member is fixed, and fixed to the back side of the metal base member, toward the wall surface on the cylinder bore side in the lower part of the grooved cooling water channel, A biasing member that biases the metal base member so as to press the heat retaining rubber member, and a wall surface of the metal base member and the cylinder bore side in the lower part of the grooved cooling water flow path fixed to the back side of the metal base member And a back side flow suppression member that suppresses the flow of cooling water between the opposite wall surface,
The heat retaining rubber member includes a heat retaining rubber member end bore for keeping the bore wall of the end bore at one end, a heat retaining rubber member end bore for keeping the bore wall of the end bore at the other end, Or a heat retaining rubber member end bore for keeping the bore wall of the end bore at one end, and a heat retaining rubber member end bore for keeping the bore wall of the other end bore. A heat insulation rubber member intermediate bore portion for keeping the respective bore walls of the intermediate bore, and
The metal base member is connected from the bore wall side of the end bore at one end to the bore wall side of the end bore at the other end,
One or more of the urging members are attached to each of the bore portions of the metal base member end bore portion and the metal base member intermediate bore portion,
That one or more back side flow restraining members are attached;
A cylinder bore wall heat insulator characterized by the above is provided.

Further, the present invention (5) is installed in the middle and lower part of the groove-like cooling water flow path of the cylinder block of the internal combustion engine having three or more cylinder bores, and keeps the bore wall on one half of the bore walls of all the cylinder bores. A cylinder bore wall heat insulator for
Of the entire wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path, the wall surface on one half side is in contact with the shape on the cylinder bore side in the lower part of the grooved cooling water flow path. A heat insulating rubber member, a metal base member to which the heat insulating rubber member is fixed, and fixed to the back side of the metal base member, toward the wall surface on the cylinder bore side in the lower part of the grooved cooling water channel, A biasing member that biases the metal base member so as to press the heat retaining rubber member, and a wall surface of the metal base member and the cylinder bore side in the lower part of the grooved cooling water flow path fixed to the back side of the metal base member And a back side flow suppression member that suppresses the flow of cooling water between the opposite wall surface,
The heat retaining rubber member includes a heat retaining rubber member end bore for keeping the bore wall of the end bore at one end, a heat retaining rubber member end bore for keeping the bore wall of the end bore at the other end, A heat retaining rubber member intermediate bore portion for keeping warm each bore wall of the one or more intermediate bores,
The metal base member is connected from the bore wall side of the end bore at one end to the bore wall side of the end bore at the other end,
One or more of the urging members are attached to each of the bore portions of the metal base member end bore portion and the metal base member intermediate bore portion,
That one or more back side flow restraining members are attached;
(4) A cylinder bore wall heat insulator characterized by the above is provided.

Moreover, this invention (6) is installed in the middle lower part of the groove-shaped cooling water flow path of the cylinder block of the internal combustion engine which has two cylinder bores, and keeps the bore wall of one half of the bore walls of all the cylinder bores. Cylinder bore wall insulation,
Of the entire wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path, the wall surface on one half side is in contact with the shape on the cylinder bore side in the lower part of the grooved cooling water flow path. A heat insulating rubber member, a metal base member to which the heat insulating rubber member is fixed, and fixed to the back side of the metal base member, toward the wall surface on the cylinder bore side in the lower part of the grooved cooling water channel, A biasing member that biases the metal base member so as to press the heat retaining rubber member, and a wall surface of the metal base member and the cylinder bore side in the lower part of the grooved cooling water flow path fixed to the back side of the metal base member And a back side flow suppression member that suppresses the flow of cooling water between the opposite wall surface,
The heat insulating rubber member is composed of a heat insulating rubber member end bore portion for keeping the bore wall of the end bore at one end, and a heat insulating rubber member end bore portion for keeping the bore wall of the end bore at the other end,
The metal base member is connected from the bore wall side of the end bore at one end to the bore wall side of the end bore at the other end,
The biasing member is attached to one or more metal base member end bores,
That one or more back side flow restraining members are attached;
(4) A cylinder bore wall heat insulator characterized by the above is provided.

  In addition, the present invention (7) includes (1) to (1) to both the wall surface on one half side and the wall surface on the other half side of the entire wall surface on the cylinder bore side in the middle and lower part of the grooved coolant flow path. 6) An internal combustion engine characterized in that any one of the cylinder bore wall heat insulators is installed.

  In the present invention (8), any one of the cylinder bore walls according to any one of (1) to (6) may be provided only on one half-side wall surface of all the wall surfaces on the cylinder bore side in the middle and lower part of the grooved coolant flow path. The present invention provides an internal combustion engine characterized in that a heat insulator is installed.

  Moreover, this invention (9) provides the motor vehicle characterized by having the internal combustion engine of this invention (7) or (8).

  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. Further, according to the present invention, it is possible to provide a heat retaining device that is less likely to be displaced in the grooved cooling water flow path due to vibration or the flow of cooling water.

It is a typical top view which shows the form example of the cylinder block in which the heat insulating tool of the cylinder bore wall of this invention is installed. It is the xx sectional view taken on the line of FIG. It is a perspective view of the cylinder block shown in FIG. It is a typical perspective view which shows the form example of the heat insulating tool of the cylinder bore wall of this invention. It is the top view which looked at the heat insulating tool of the cylinder bore wall shown in FIG. 4 from the upper side. It is the side view which looked at the heat insulating tool of the cylinder bore wall shown in FIG. 4 from the heat insulation rubber member side. It is the side view which looked at the thermal insulation of the cylinder bore wall shown in FIG. 4 from the urging | biasing and back side flow suppression member side. It is a schematic diagram which shows a mode that the thermal insulation 20 of a cylinder bore wall is installed in the cylinder block 11 shown in FIG. It is a schematic diagram which shows a mode that the heat insulator 20a, 20b of two cylinder bore walls is installed in the cylinder block 11 shown in FIG. FIG. 10 is an end view taken along line xx in FIG. 9. It is a schematic diagram which shows the example of the form of the manufacturing method of the warmer of a cylinder bore wall. It is a schematic diagram which shows the example of the form of the manufacturing method of the warmer of a cylinder bore wall. It is a schematic diagram which shows the example of the form of the manufacturing method of the warmer of a cylinder bore wall. It is a schematic diagram which shows the example of the form of the manufacturing method of the warmer of a cylinder bore wall. It is a schematic diagram which shows the example of the form of the manufacturing method of the warmer of a cylinder bore wall. It is a schematic diagram which shows the other example of a thermal insulation of the cylinder bore wall of this invention. It is a schematic diagram which shows the other example of a thermal insulation of the cylinder bore wall of this invention. It is a schematic diagram which shows the other example of a thermal insulation of the cylinder bore wall of this invention. It is a schematic diagram which shows the other example of an installation method of the urging | biasing member.

  A heat retaining device for a cylinder bore wall according to the present invention and an internal combustion engine according to the present invention will be described with reference to FIGS. 1 to 3 show an example of a cylinder block in which a cylinder bore wall heat insulator of the present invention is installed, and FIG. 1 shows a cylinder block in which a cylinder bore wall heat insulator of the present invention is installed. FIG. 2 is a schematic plan view, FIG. 2 is a sectional view taken along line xx of FIG. 1, and FIG. 3 is a perspective view of the cylinder block shown in FIG. 4 to 7 show an example of the shape of the cylinder bore wall heat insulator of the present invention, and FIG. 4 is a schematic perspective view showing an example of the shape of the cylinder bore wall heat retainer of the present invention. 4 (A) is a perspective view seen from the heat retaining rubber member side, FIG. 4 (B) is a perspective view seen from the urging and back side flow suppressing member side, and FIG. FIG. 6 is a side view of the cylinder bore wall heat insulator shown in FIG. 4 viewed from the heat insulating rubber member side, and FIG. 7 is a side view of the cylinder bore wall heat insulator shown in FIG. It is the side view which looked at the thermal insulation of the cylinder bore wall shown from the urging | biasing and back side flow suppression member side. FIG. 8 is a schematic diagram showing a state in which the cylinder bore wall heat insulator 20 is installed in the cylinder block 11 shown in FIG. 1, and FIG. 9 is a diagram showing two cylinder bore wall heat insulators in the cylinder block 11 shown in FIG. It is a schematic diagram which shows a mode that 20a, 20b is installed, and FIG. 10 is an end elevation when it cuts by the xx line | wire of FIG.

  As shown in FIGS. 1 to 3, a bore 12 for moving a piston up and down and a cooling water flow through an open deck type cylinder block 11 of a vehicle-mounted internal combustion engine in which a heat insulator for a cylinder bore wall is installed. The groove-shaped 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.

  The cylinder block 11 is formed with two or more bores 12 arranged in series. Therefore, the bore 12 has end bores 12a1 and 12a2 adjacent to one bore and intermediate bores 12b1 and 12b2 sandwiched between the two bores (note that the number of bores in the cylinder block is two). In the case, only the end bore.) Of the bores arranged in series, the end bores 12a1 and 12a2 are bores at both ends, and the intermediate bores 12b1 and 12b2 are bores between the end bore 12a1 at one end and the end bore 12a2 at the other end.

  In the present invention, among the wall surfaces of the grooved cooling water flow path 14, the wall surface on the cylinder bore 13 side is described as the wall surface 17 on the cylinder bore side of the grooved cooling water flow path, and among the wall surfaces of the grooved cooling water flow path 14, A wall surface on the opposite side of the wall surface 17 on the cylinder bore side of the groove-shaped cooling water passage is referred to as a wall surface 18.

  The cylinder bore wall heat retaining device 20 shown in FIGS. 4 to 7 includes a metal base member 21, a heat retaining rubber member 22, and a back side rubber member 23.

  The heat insulating rubber member 22 is formed in a shape in which four arcs are continuous when viewed from above, and the shape on the contact surface 25 side of the heat insulating rubber member 22 is the middle and lower part of the groove-like cooling water flow path 14. It is a shape along the wall surface of the cylinder bore side. The heat retaining rubber member 22 is sandwiched between the metal base member 21 and the bent portion 24 by bending the bent portions 24 formed on the upper side and the lower side of the metal base member 21. It is fixed. In the heat retaining rubber member 22, the surface of the heat retaining rubber member 22 on the side opposite to the metal base member 21 side is a contact surface 25 in contact with the wall surface 17 on the cylinder bore side in the lower part of the grooved cooling water flow path.

  When viewed from above, the metal base member 21 is formed in a shape in which four arcs are continuous, and the shape of the metal base member 21 is opposite to the back surface side of the heat insulating rubber member 22 (opposite to the contact surface 25 side). Side surface).

  The heat retaining rubber member 22 of the heat retaining member 20 on the cylinder bore wall includes a heat retaining rubber member end bore portion 35a that is in contact with the wall surface on the end bore 12a1 side of one end of the groove-like cooling water flow path 14 on the bore side; The heat insulation rubber member end bore portion 35b is in contact with the wall surface on the other end bore 12a2 side, and the heat insulation rubber member intermediate bore portions 36a and 36b are in contact with the wall surfaces on the intermediate bores 12b1 and 12b2. The heat retaining rubber member end bore portion 35a is a portion of a heat retaining rubber member for retaining the wall surface on the end bore 12a1 side at one end, and the heat retaining rubber member end bore portion 35b is disposed on the end bore 12a2 side on the other end. It is a part of the heat retaining rubber member for keeping the wall surface, and the heat retaining rubber member intermediate bore parts 36a, 36b are parts of the heat insulating rubber member for keeping the wall surface on the side of the intermediate bores 12b1, 12b2, respectively. .

  The metal base member 21 of the heat insulator 20 on the cylinder bore wall is formed of one metal plate from the end bore 12a1 side at one end to the end bore 12a2 side at the other end. Therefore, the metal base member 21 of the heat insulator 20 on the cylinder bore wall includes the metal base member end bore portion 37a on the end bore 12a1 side at one end, the metal base member intermediate bore portions 38a and 38b on the side of the intermediate bores 12b1 and 12b2, and others. A metal base member end bore portion 37b on the end bore 12a1 side is connected.

  A back side rubber member 23 is fixed to the back side of the metal base member 21 (the side opposite to the side where the heat retaining rubber member is fixed). The back side rubber member 23 is formed in an arc shape when viewed from above, and the shape of the back side rubber member 23 on the contact surface 26 side is the wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path 14. It is a shape along the wall surface 18 on the opposite side. The back side rubber member 23 is fixed to the metal base member 21 by being bonded to the back side of the metal base member 21 with an adhesive. In the back side rubber member 23, the surface of the back side rubber member 23 opposite to the metal base member 21 side is in contact with the wall surface 18 on the side opposite to the wall surface on the cylinder bore side in the middle and lower part of the groove-like cooling water flow path. 26.

  The heat retaining device 20 on the cylinder bore wall is installed, for example, in the middle and lower part of the groove-like cooling water flow path 14 of the cylinder block 11 shown in FIG. As shown in FIG. 8, the cylinder bore wall heat insulator 20 is inserted into the grooved coolant flow path 14 of the cylinder block 11, and the cylinder bore wall heat insulator 20 is inserted into the groove shape as shown in FIGS. 9 and 10. Installed in the middle and lower part of the cooling water channel 14. The heat retaining member 20a on the cylinder bore wall has a shape of the heat insulating rubber member 22a along the wall surface 17a of the half on one side of the entire wall surface 17 on the cylinder bore side in the lower part of the groove-like cooling water flow path. The warmer 20a of the cylinder bore wall is installed on the wall surface 17a side of one half. Further, the heat retaining member 20b on the cylinder bore wall has a shape of the heat insulating rubber member 22b along the wall surface 17b on the other half of the entire wall surface 17 on the cylinder bore side in the middle and lower part of the grooved coolant flow path. Therefore, the cylinder bore wall heat insulator 20b is installed on the other half wall surface 17b side.

  At this time, in the heat retaining device 20 on the cylinder bore wall, the distance from the contact surface 25 of the heat retaining rubber member 22 to the contact surface 26 of the back side rubber member 23 is larger than the width of the grooved cooling water flow path 14. A back side rubber member 23 is attached. Therefore, when the heat insulator 20 on the cylinder bore wall is installed in the middle and lower part of the groove-like cooling water flow path 14, the back side rubber member 23 is placed in the groove-like cooling water flow path with the metal base member 21 and the heat retaining rubber member 22. By being sandwiched between the wall surface 18 on the opposite side to the wall surface on the lower cylinder bore side, an elastic force is generated in the back side rubber member 23 to return to the original. Then, by this elastic force, the metal base member 21 is pushed toward the wall surface 17 on the cylinder bore side of the groove-shaped cooling water flow path. As a result, the heat retaining rubber member 22 is caused to flow into the groove-shaped cooling water flow by the metal base member 21. It is pressed against the wall surface 17 on the cylinder bore side of the road. That is, by installing the heat insulator 20 on the cylinder bore wall in the middle and lower part of the groove-shaped cooling water flow path 14, an elastic force is generated in the back-side rubber member 23, and the heat-insulating rubber member 22 is grooved by this elastic force. The metal base member 21 is biased so as to be pressed against the wall surface 17 on the cylinder bore side of the cooling water passage. In this way, in the cylinder bore wall heat retaining device 20a, the heat insulating rubber member 22a contacts the wall surface 17a on one half of the entire wall surface 17 on the cylinder bore side in the middle and lower part of the grooved cooling water flow path, and the cylinder bore wall In the heat retaining device 20b, the heat retaining rubber member 22b is in contact with the wall surface 17b on one half of the entire wall surface 17 on the cylinder bore side in the middle and lower part of the grooved cooling water flow path.

  In addition, between the metal base member 21 and the wall surface 18 on the opposite side of the wall surface on the cylinder bore side in the middle and lower part of the groove-shaped cooling water flow path, the back side rubber member extends over the entire middle and lower part in the vertical direction. 23 exists, the back side rubber member 23 causes the cooling water to flow between the metal base member 21 and the wall surface 18 on the opposite side to the wall surface on the cylinder bore side in the lower part of the grooved cooling water flow path. It is suppressed.

  As described above, the back side rubber member 23 is formed by the member / metal base member 21 for biasing the metal base member 21 and the wall surface 18 on the opposite side to the wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path. It functions as a member for suppressing the flow of cooling water between them.

  In the present invention, the wall surface on one side half side of the entire wall surface on the cylinder bore side in the middle and lower part of the groove-like cooling water flow path is the wall surface on the cylinder bore side in the middle and lower part of the groove-like cooling water flow path. It refers to the half wall surface on one side when it is vertically divided into two. For example, in FIG. 9, the direction in which the cylinder bores are aligned is the y-y direction, and each of the half walls on one side when the cylinder bores are vertically divided along this y-y line is located in the lower part of the groove-shaped cooling water flow path. It is the wall surface of one half of all the wall surfaces on the cylinder bore side. That is, in FIG. 9, the middle lower wall surface on the upper half side of the y-y line is the one half wall surface 17 a on the one side half of the entire wall surface 17 on the cylinder bore side in the middle lower part of the grooved coolant flow path. The wall surface of the middle half at the side half side is the wall surface 17b of the other half on the other side of all the wall surfaces 17 on the cylinder bore side of the grooved coolant flow channel.

  The cylinder bore wall heat insulator 20 is manufactured, for example, by the method shown in FIGS. Note that the cylinder bore wall heat insulator of the present invention is not limited to the one manufactured by the method described below.

  First, a cut-off portion 31 indicated by a dotted line is cut off from a rectangular metal plate 30 shown in FIG. 11 to produce a metal base member 21 before forming shown in FIG. A bent portion 24 is formed on the upper and lower sides of the metal base member 21.

  Next, as shown in FIG. 13, the metal base member 21 before molding is molded into a shape along the back side of the heat retaining rubber member 22 (the back surface 33 side of the heat retaining rubber member 22 shown in FIG. 14).

  Next, as shown in FIG. 14, the heat retaining rubber member 22 formed so that the contact surface 25 side is aligned with the wall surface 17 on the cylinder bore side in the middle and lower part of the groove-like cooling water flow path 14, and the metal base member 21 after forming are formed. Match.

  Next, as shown in FIG. 15, the bent portion 24 is bent toward the heat insulating rubber member, and the heat insulating rubber member 22 is sandwiched between the bent portion 24 and the metal base member 21, whereby the heat insulating rubber is attached to the metal base member 21. The member 22 is fixed. Further, the rubber member 23 on the back side is bonded to the back side 34 of the metal base member 21 with an adhesive to obtain a heat insulator for the cylinder bore wall.

A cylinder bore wall heat retaining device according to the present invention is installed in the middle and lower part of a groove-like cooling water flow path of a cylinder block of an internal combustion engine having a cylinder bore, and is a cylinder bore for keeping warm one half of the bore walls of all the cylinder bores. Wall insulation,
Of the entire wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path, the wall surface on one half side is in contact with the shape on the cylinder bore side in the lower part of the grooved cooling water flow path. A heat insulating rubber member, a metal base member to which the heat insulating rubber member is fixed, and fixed to the back side of the metal base member, toward the wall surface on the cylinder bore side in the lower part of the grooved cooling water channel, The metal base member is urged to press the heat retaining rubber member, and the cooling water flow between the metal base member and the wall surface on the opposite side to the wall surface on the cylinder bore side in the lower part of the grooved cooling water flow path is An urging and back side flow suppressing member for suppressing,
The heat retaining rubber member includes a heat retaining rubber member end bore for keeping the bore wall of the end bore at one end, a heat retaining rubber member end bore for keeping the bore wall of the end bore at the other end, Or a heat retaining rubber member end bore for keeping the bore wall of the end bore at one end, and a heat retaining rubber member end bore for keeping the bore wall of the other end bore. A heat insulation rubber member intermediate bore portion for keeping the respective bore walls of the intermediate bore, and
The metal base member is connected from the bore wall side of the end bore at one end to the bore wall side of the end bore at the other end,
One or more of the urging and back side flow suppressing members are provided for each of the bore portions of the metal base member end bore portion and the metal base member intermediate bore portion,
A cylinder bore wall heat insulator characterized by

  The cylinder bore wall heat insulator of the present invention includes the cylinder bore wall heat retainer of the first embodiment of the present invention and the cylinder bore wall heat retainer of the second embodiment of the present invention described below.

The cylinder bore wall heat retaining device (hereinafter also referred to as the cylinder bore wall heat retaining device (1) of the present invention) according to the first aspect of the present invention is a groove cooling of a cylinder block of an internal combustion engine having three or more cylinder bores. It is installed in the middle lower part of the water flow path, and is a cylinder bore wall heat insulator for keeping the bore wall of one half of the bore walls of all cylinder bores,
Of the entire wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path, the wall surface on one half side is in contact with the shape on the cylinder bore side in the lower part of the grooved cooling water flow path. A heat insulating rubber member, a metal base member to which the heat insulating rubber member is fixed, and fixed to the back side of the metal base member, toward the wall surface on the cylinder bore side in the lower part of the grooved cooling water channel, The metal base member is urged to press the heat retaining rubber member, and the cooling water flow between the metal base member and the wall surface on the opposite side to the wall surface on the cylinder bore side in the lower part of the grooved cooling water flow path is An urging and back side flow suppressing member for suppressing,
The heat retaining rubber member includes a heat retaining rubber member end bore for keeping the bore wall of the end bore at one end, a heat retaining rubber member end bore for keeping the bore wall of the end bore at the other end, A heat retaining rubber member intermediate bore portion for keeping warm each bore wall of the one or more intermediate bores,
The metal base member is connected from the bore wall side of the end bore at one end to the bore wall side of the end bore at the other end,
One or more of the urging and back side flow suppressing members are provided for each of the bore portions of the metal base member end bore portion and the metal base member intermediate bore portion,
A cylinder bore wall heat insulator characterized by

A cylinder bore wall heat retaining device (hereinafter also referred to as a cylinder bore wall heat retaining device (2) of the present invention) of the second embodiment is a groove-shaped cooling water flow path of a cylinder block of an internal combustion engine having two cylinder bores. Cylinder bore wall heat insulator installed in the middle and lower part to keep the bore wall of one half of the bore walls of all cylinder bores,
Of the entire wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path, the wall surface on one half side is in contact with the shape on the cylinder bore side in the lower part of the grooved cooling water flow path. A heat insulating rubber member, a metal base member to which the heat insulating rubber member is fixed, and fixed to the back side of the metal base member, toward the wall surface on the cylinder bore side in the lower part of the grooved cooling water channel, The metal base member is urged to press the heat retaining rubber member, and the cooling water flow between the metal base member and the wall surface on the opposite side to the wall surface on the cylinder bore side in the lower part of the grooved cooling water flow path is An urging and back side flow suppressing member for suppressing,
The heat insulating rubber member is composed of a heat insulating rubber member end bore portion for keeping the bore wall of the end bore at one end, and a heat insulating rubber member end bore portion for keeping the bore wall of the end bore at the other end,
The metal base member is connected from the bore wall side of the end bore at one end to the bore wall side of the end bore at the other end,
One or more of the urging and back side flow suppressing members are provided for each metal base member end bore portion,
A cylinder bore wall heat insulator characterized by

  The cylinder bore wall heat retaining device (1) of the present invention and the cylinder bore wall heat retaining device (2) of the present invention are the same except that the number of cylinder bores of the installed cylinder block is different.

  The cylinder bore wall heat insulator (1) or (2) according to the present invention is installed in the middle and lower part of the grooved coolant flow path of the cylinder block of the internal combustion engine. The cylinder block on which the cylinder bore wall heat insulating device (1) of the present invention is installed is an open deck type cylinder block in which three or more cylinder bores are formed in series, so that it has two end bores and one or more end bores. The cylinder bore is composed of an intermediate bore. Further, the cylinder block in which the cylinder bore wall heat insulator (2) of the present invention is installed is an open deck type cylinder block in which two cylinder bores are formed in series, and therefore, a cylinder bore comprising two end bores. have. In the present invention, among the cylinder bores arranged in series, the bores at both ends are called end bores, and the bores sandwiched between the other cylinder bores are called intermediate bores.

  The position where the heat insulator (1) or (2) on the cylinder bore wall according to the present invention is installed is the middle and lower part of the groove-shaped cooling water flow path. In FIG. 2, a position 10 near the middle between the uppermost part 9 and the lowermost part 8 of the groove-like cooling water flow path 14 is indicated by a dotted line, but the groove-like cooling water flow path 14 on the lower side from the position 10 near the middle is shown. This portion is referred to as the middle lower portion of the grooved cooling water flow path. The middle and lower part of the grooved cooling water flow path does not mean the part below the middle part between the uppermost part and the lowermost part of the grooved cooling water flow path. It means the part. Therefore, the position from the lowest part of the grooved cooling water flow path to the heat retaining device of the present invention, that is, the position of the upper end of the heat insulating rubber member in the vertical direction of the grooved cooling water flow path Is appropriately selected.

  The heat retaining rubber member is a member that keeps the middle and lower portions of the cylinder bore wall in contact with the wall surface on the cylinder bore side in the middle and lower portion of the grooved coolant flow path. Therefore, the shape on the contact surface side of the heat retaining rubber member is a shape along the wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path. The cylinder bore wall heat retaining device (1) or (2) of the present invention is installed in the middle lower part of the groove-like cooling water flow path, so that the urging and back side flow suppressing member pushes the metal base member, As a result, the heat retaining rubber member is pressed with the contact surface side (the surface side opposite to the metal base member side) in contact with the wall surface on the cylinder bore side in the lower part of the grooved cooling water flow path.

  Examples of the material for the heat retaining rubber member include solid rubber, expanded rubber, foamed rubber, soft rubber, and the like, and silicone-based gel material. As the material for the rubber member, a heat insulator for the cylinder bore wall is used. When installing in the grooved cooling water flow path, the grooved cooling water flow can be prevented after the installation of the cylinder bore wall heat insulator in that it can prevent the rubber member from coming into strong contact with the cylinder bore wall and scraping the rubber member. A heat-expandable rubber or water-swellable rubber that can expand the rubber member portion in the road is preferred. .

  Examples of the composition of the solid rubber include natural rubber, butadiene rubber, ethylene propylene diene rubber (EPDM), nitrile butadiene rubber (NBR), silicone rubber, fluorine rubber, and the like.

  Examples of the expanded rubber include heat-sensitive expanded rubber. Thermally-expandable rubber is a composite in which a base foam material is impregnated with a thermoplastic material having a melting point lower than that of the base foam material and is compressed. At room temperature, the compressed state is maintained by at least the cured product of the thermoplastic material on the surface layer. In addition, the cured material of the thermoplastic material is softened by heating, and the compressed state is released. Examples of the heat-sensitive expansion rubber include heat-sensitive expansion rubber described in JP-A-2004-143262. In the case where the material of the heat insulating rubber member is heat-sensitive expansion rubber, the heat insulating material for the cylinder bore wall according to the present invention is installed in the lower part of the groove-like cooling water flow path, and heat is applied to the heat-sensitive expansion rubber so that the heat-sensitive expansion rubber is It expands and deforms into a predetermined shape.

  Examples of the base foam material relating to the heat-expandable rubber include various polymer materials such as rubber, elastomer, thermoplastic resin, and thermosetting resin. Specifically, natural rubber, chloropropylene rubber, styrene butadiene rubber, nitrile Examples include butadiene rubber, ethylene propylene diene terpolymer, various synthetic rubbers such as silicone rubber, fluoro rubber, and acrylic rubber, various elastomers such as soft urethane, various thermosetting resins such as hard urethane, phenol resin, and melamine resin. It is done.

  As the thermoplastic substance related to the heat-sensitive expansion rubber, those having any of glass transition point, melting point or softening temperature of less than 120 ° C are preferable. Thermoplastic materials related to heat-expandable rubber include polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyacrylate ester, styrene butadiene copolymer, chlorinated polyethylene, polyvinylidene fluoride, ethylene acetate Vinyl copolymer, ethylene vinyl acetate vinyl chloride acrylic ester copolymer, ethylene vinyl acetate acrylic ester copolymer, ethylene vinyl acetate vinyl chloride copolymer, nylon, acrylonitrile butadiene copolymer, polyacrylonitrile, polyvinyl chloride , Polychloroprene, polybutadiene, thermoplastic polyimide, polyacetal, polyphenylene sulfide, polycarbonate, thermoplastic resins such as thermoplastic polyurethane, low melting glass frit, starch Solder include various thermoplastic compounds such as wax.

  Further, examples of the expanded rubber include water-swellable rubber. The water-swellable rubber is a material in which a water-absorbing substance is added to rubber, and is a rubber material having a shape retaining property that absorbs water and swells and maintains an expanded shape. Examples of the water-swellable rubber include a rubber material in which a water-absorbing substance such as a cross-linked product of neutralized polyacrylic acid, a cross-linked product of starch acrylic acid graft copolymer, a cross-linked carboxymethyl cellulose salt, and polyvinyl alcohol is added to the rubber. Can be mentioned. Examples of the water-swellable rubber include water-swellable rubbers containing ketiminated polyamide resins, glycidyl etherified products, water-absorbing resins and rubbers described in JP-A-9-208752. When the material of the heat retaining rubber member is water swellable rubber, the heat insulating device for the cylinder bore wall of the present invention is installed in the lower part of the grooved cooling water flow path, the cooling water is flowed, and the water swellable rubber absorbs the water. By doing so, the water-swellable rubber expands and expands and deforms into a predetermined shape.

  Foam rubber is a porous rubber. Examples of the foam rubber include sponge-like foam rubber having an open cell structure, foam rubber having a closed cell structure, and semi-closed foam rubber. Specific examples of the material for the foam rubber include ethylene propylene diene terpolymer, silicone rubber, nitrile butadiene copolymer, silicone rubber, and fluoro rubber. The foaming rate of the foamed rubber is not particularly limited, and is appropriately selected. By adjusting the foaming rate, the moisture content of the heat retaining rubber member can be adjusted. The foaming rate of the foamed rubber refers to a density ratio before and after foaming represented by ((density before foaming−density after foaming) / density before foaming) × 100.

  When the material of the heat retaining rubber member is a material that can contain water, such as water-swellable rubber and foamed rubber, the heat retaining device for the cylinder bore wall of the present invention is installed in the grooved cooling water flow path, and the grooved cooling is performed. When the cooling water is passed through the water flow path, the heat retaining rubber member contains water. The range in which the moisture content of the heat retaining rubber member is set when the cooling water is caused to flow through the grooved cooling water flow path is appropriately selected depending on the operating conditions of the internal combustion engine. In addition, a moisture content refers to the weight moisture content represented by (cooling water weight / (filler weight + cooling water weight)) × 100.

  The thickness of the heat insulating rubber member is not particularly limited and is appropriately selected.

  The metal base member is a member to which the heat retaining rubber member and the urging and back side flow suppressing member are fixed. The metal base member is a member that uniformly presses the heat retaining rubber member against the wall surface on the cylinder bore side in the lower part of the grooved cooling water flow path by being pressed by the urging force by the urging and back side flow suppressing member. Therefore, the shape of the metal base member is a shape along the back side (the surface side opposite to the contact surface) of the heat retaining rubber member.

  The material of the metal base member 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 metal base member is not particularly limited and is appropriately selected.

  The urging and back side flow suppressing member is fixed to the back side of the metal base member. This biasing / back side flow restricting member faces the wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path by installing the heat insulator for the cylinder bore wall according to the present invention in the middle and lower part of the grooved cooling water flow path. In addition, the metal base member is a member for urging to press the rubber member for heat insulation, and between the metal base member and the wall surface on the opposite side to the wall surface on the cylinder bore side in the lower part of the grooved cooling water flow path. It is a member for suppressing the cooling water flow which flows through. The back side of the metal base member refers to the side opposite to the surface on which the heat retaining rubber member is fixed.

  The material of the urging and back side flow restraining member is such that when the cylinder bore wall heat insulator of the present invention is installed in the middle lower part of the grooved cooling water flow path, the cylinder bore side wall surface in the middle lower part of the grooved cooling water flow path is used. On the other hand, there is no particular limitation as long as the metal base member can be urged so as to press the rubber member for heat insulation. Examples of the material of the urging / back side flow suppressing member include rubbers such as solid rubber, expanded rubber, foamed rubber, and soft rubber, and silicone-based gel materials. Solid rubber, expanded rubber, foam rubber, soft rubber, etc. related to urging and back flow control member, silicone gel-like material, solid rubber, expanded rubber, foam rubber, soft rubber, etc. related to heat retaining rubber member This is the same as the rubber and silicone gel material. In addition, examples of the material of the urging and back side flow suppressing member include resins such as thermoplastic resins and thermosetting resins.

  The shape of the biasing / back side flow restraining member is such that when the heat insulator for the cylinder bore wall of the present invention is installed in the lower part of the grooved cooling water flow path, If it is a shape which can suppress the cooling water flow between the wall surface of the lower cylinder bore side and the opposite wall surface, it will not be restrict | limited. For example, in the embodiment shown in FIG. 4, the urging and back-side flow suppressing member is arranged in substantially the entire vertical direction of the middle and lower part of the groove-like cooling water flow path. Any shape is acceptable as long as the coolant flow between the wall surface on the opposite side to the wall surface on the cylinder bore side in the middle and lower part of the groove-like cooling water flow path is limited. A shape in which the urging and back-side flow suppressing member is arranged in a part of the vertical direction of the above is mentioned. Further, in the embodiment shown in FIG. 4, when viewed in the flow direction of the cooling water (when viewed from above), the back surface side of the metal base member and the wall surface on the cylinder bore side in the lower part of the grooved cooling water flow path are The urging and back side flow suppression member is arranged so as to fill almost the entire gap with the opposite wall surface, but the back side of the metal base member and the cylinder bore side in the lower part of the grooved coolant flow path As long as the cooling water flow between the opposite wall surface and the wall surface opposite to that of the wall surface is suppressed, the cooling water flow is viewed in the flow direction of the cooling water as shown in FIG. When viewed from above (when viewed from above), the energizing and The shape by which a back side flow suppression member is arrange | positioned is mentioned.

  In the heat insulator 20 on the cylinder bore wall shown in FIG. 4, the heat insulating rubber member is formed by bending the bent portions formed on the upper side and the lower side of the metal base member toward the heat insulating rubber member, and the heat is maintained by the bent portion and the metal base member. The urging and back side flow restraining member is fixed to the metal base member by adhering to the back side of the metal base member by using an adhesive. The method for fixing the rubber member for energization and the biasing / back side flow suppressing member to the metal base member is not particularly limited. Other fixing methods include, for example, a method of heat-sealing a heat retaining rubber member or a biasing / back side flow suppressing member to a metal base member, a protrusion provided on the metal base member, and the protrusion being used as a heat retaining rubber member. Or the method of making it fit in an energizing and back side flow control member, etc. are mentioned.

  In the cylinder bore wall heat retaining device (1) of the present invention, the heat retaining rubber member retains the heat retaining rubber member end bore portion for keeping the bore wall of the end bore at one end and the bore wall of the end bore at the other end. A heat retaining rubber member end bore portion and a heat retaining rubber member intermediate bore portion for warming each bore wall of the one or more intermediate bores. The wall surface on one side half of the wall surface on the cylinder bore side in the middle and lower part of the groove-like cooling water flow path of the cylinder block in which the cylinder bore wall heat retaining device (1) of the present invention is installed, A wall surface on the end bore side and one or more wall surfaces on the intermediate bore side. In the heat retaining device (1) for the cylinder bore wall according to the present invention, the rubber member for heat insulation is in contact with the wall surface on one end bore side, the wall surface on the other end bore side, and the wall surfaces on one or more intermediate bore sides. It has a part to do.

  In the cylinder bore wall heat retaining device (2) of the present invention, the heat retaining rubber member retains the heat retaining rubber member end bore portion for keeping the bore wall of the end bore at one end and the bore wall of the end bore at the other end. And a heat retaining rubber member end bore portion. The wall surface on one half side of the wall surface on the cylinder bore side in the middle and lower part of the groove-like cooling water flow path of the cylinder block in which the cylinder bore wall heat insulator (2) of the present invention is installed, There is a wall on the end bore side. In the heat retaining tool (2) for the cylinder bore wall according to the present invention, the heat retaining rubber member has a portion that contacts the wall surface on the end bore side at one end and the wall surface on the end bore side at the other end.

  In the embodiment shown in FIG. 4, a heat retaining rubber member end bore for keeping the bore wall of the end bore at one end and a heat retaining rubber member intermediate bore for keeping each bore wall of one or more intermediate bores. The heat retaining rubber member end bore for keeping the bore wall of the end bore at the other end is continuous, but the present invention is not limited to this. As another form example of the cylinder bore wall heat insulator (1) of the present invention, for example, a form example in which the heat insulating rubber member is divided for each bore wall side as in the form example shown in FIG. Can be mentioned. Further, as another example of the heat insulating device for the cylinder bore wall according to the present invention, the heat insulating rubber member provided for each bore wall side of the embodiment shown in FIG. 16 is further divided into a plurality of parts. An example is given. As described above, in the cylinder bore wall heat retaining device (1) according to the present invention, the heat retaining rubber member end bore portion for keeping the bore wall of the end bore at one end and each bore wall of the one or more intermediate bores are kept warm. The heat retaining rubber member intermediate bore portion and the heat retaining rubber member end bore portion for keeping the bore wall of the end bore at the other end may or may not be continuous. Also good. Further, in the cylinder bore wall heat retaining device (1) of the present invention, the heat retaining rubber member end bore portion for keeping the bore wall of the end bore at one end and each bore wall of the one or more intermediate bores are kept warm. The heat insulation rubber member intermediate bore part and the heat insulation rubber member end bore part for keeping the bore wall of the end bore at the other end are continuous. This is preferable in that it is less likely to cause displacement due to vibration or the flow of cooling water in the water flow path. The same applies to the cylinder bore wall heat insulator (2) according to the present invention. In the cylinder bore wall heat retainer (2) according to the present invention, the heat retaining rubber member end bore for heat retaining the bore wall of the end bore at one end. And the heat retaining rubber member end bore for keeping the bore wall of the end bore at the other end may be continuous or may not be continuous. Further, in the cylinder bore wall heat retaining device (2) of the present invention, the heat retaining rubber member end bore for keeping the bore wall of the end bore at one end and the heat insulation for keeping the bore wall of the end bore at the other end. It is preferable that the rubber member end bore portion is continuous from the viewpoint that the heat insulator of the cylinder bore wall is less likely to be displaced due to vibration or the flow of cooling water in the grooved cooling water flow path.

  In the heat retaining device (1) or (2) for the cylinder bore wall according to the present invention, the heat retaining rubber member covers all the wall surfaces on the cylinder bore side of one half of the middle part of the grooved cooling water flow path. Or, it may be a part of the wall surface on the cylinder bore side of one half of the middle lower part of the grooved cooling water flow path and cover only the part necessary for heat insulation in the middle lower part of the cylinder bore wall. Good.

  In the heat insulator (1) for the cylinder bore wall according to the present invention, the metal base member is connected from the bore wall side of the end bore at one end to the bore wall side of the end bore at the other end. That is, in the cylinder bore wall heat insulating device (1) of the present invention, the metal base member is a metal base member end bore portion on the bore wall side of the end bore on one end and the metal on each bore wall side of one or more intermediate bores. The base member intermediate bore portion is connected to the metal base member end bore portion on the bore wall side of the end bore at the other end. In the embodiment shown in FIG. 4, the metal base member includes a metal base member end bore portion on the bore wall side of one end bore, a metal base member intermediate bore portion on each bore wall side of one or more intermediate bores, and The metal base member end bore portion on the bore wall side of the end bore at the other end is formed of one metal plate. However, the present invention is not limited to this, and the metal base member is formed at one end. A metal base member end bore on the bore wall side of the end bore, a metal base member intermediate bore on each bore wall side of one or more intermediate bores, and a metal base member end bore on the bore wall side of the other end bore As long as they are connected to each other, they may be formed from a single metal plate or may be a combination of a plurality of metal plates. The same applies to the cylinder bore wall heat retaining device (2) of the present invention. In the cylinder bore wall heat retaining device (2) of the present invention, the metal base member is connected to the end of the other end from the bore wall side of the one end bore. It is connected to the bore wall side of the bore. That is, in the cylinder bore wall heat insulating device (2) of the present invention, the metal base member includes the metal base member end bore portion on the bore wall side of the one end bore and the metal base member on the bore wall side of the other end bore. The end bore part is connected. In the cylinder bore wall heat insulator (2) according to the present invention, the metal base member includes a metal base member end bore portion on the bore wall side of the end bore on one end and a metal base member on the bore wall side of the end bore on the other end. As long as the end bore part is connected, it may be formed of one metal plate or a plurality of metal plates connected together.

  In the heat insulator (1) for the cylinder bore wall according to the present invention, one or more urging and back side flow suppressing members are provided for each of the bore portions of the metal base member end bore portion and the metal base member intermediate bore portion. . That is, when the heat insulator for the cylinder bore wall according to the present invention is viewed from the upper side, the urging and back side flow is applied to at least one place in the arc direction of each of the bore portions of the metal base member end bore portion and the metal base member intermediate bore portion. A restraining member is attached. In the heat retaining member 20 on the cylinder bore wall shown in FIG. 4, the urging and back-side flow suppressing member is provided at one place in the arc direction at the end bore portion, and is provided at one place in the arc direction at the intermediate bore portion. Yes. Further, in the embodiment shown in FIG. 17, the urging and back-side flow suppressing members are provided at three locations in the arc direction at the end bore portion, and are provided at two locations in the arc direction at the intermediate bore portion.

  Further, in the heat retaining device (2) for the cylinder bore wall according to the present invention, one or more urging and back side flow suppressing members are provided for each metal base member end bore portion. That is, when the heat insulator for the cylinder bore wall of the present invention is viewed from the upper side, each end bore portion of the metal base member end bore portion on one end bore side and the metal base member end bore portion on the other end bore side is provided. An urging and back side flow suppressing member is attached to at least one place in the arc direction.

  In the cylinder bore wall heat insulator (1) or (2) according to the present invention, when installed in the middle lower part of the grooved cooling water flow path, the heat retaining rubber member is appropriately pressed by the urging and back side flow suppressing member. The groove shape is such that the cooling water flow is suppressed between the rear surface side of the metal base member and the wall surface on the opposite side of the wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path. The material, shape, size, installation position, number of installations, and the like of the urging and back side flow suppressing member are appropriately selected according to the shape of the cooling water flow path.

  Further, as a heat retaining tool for the cylinder bore wall of the present invention, a member for biasing the metal base member to press the rubber member for heat retention toward the wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path; There is a form in which members for suppressing the flow of cooling water between the metal base member and the wall surface on the opposite side to the wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path are separately provided.

  FIG. 18 shows another example of the heat retaining device for the cylinder bore wall according to the present invention. 18A is a perspective view, and FIG. 18B is an end view. In FIG. 18, the heat retaining device 40 on the cylinder bore wall includes a metal base member 41, a heat retaining rubber member 42, a cooling water flow suppressing resin member 43, and a metal plate spring member 44. In the embodiment shown in FIG. 18, the metal leaf spring member 44 is attached by welding the welding side end 47 to the metal base member 41.

  In the heat retaining device 40 on the cylinder bore wall, the metal plate spring member is such that the distance from the contact surface 45 of the heat retaining rubber member 42 to the one end side 46 of the metal plate spring member 44 is larger than the width of the grooved cooling water flow path. 44 is attached. Therefore, when the heat insulator 40 on the cylinder bore wall is installed in the middle and lower part of the groove-shaped cooling water flow path, the metal plate spring member 44 is connected to the metal base member 41 and the heat retaining rubber member 42 and the cylinder bore side of the groove-shaped cooling water flow path. By being sandwiched between the wall surface opposite to the wall surface, a force is applied to the one end side 46 of the metal leaf spring member 44 in the direction toward the metal base member 41. As a result, the metal plate spring member 44 is deformed so that the one end side 46 approaches the metal base member 41 side, so that the metal plate spring member 44 has an elastic force to return. Then, by this elastic force, the metal base member 41 is pushed toward the wall surface on the cylinder bore side of the groove-like cooling water flow path, and as a result, the rubber member 42 is pushed by the metal base member 41 into the cylinder bore of the groove-like cooling water flow path. Pressed against the side wall. That is, by installing the heat insulator 40 on the cylinder bore wall in the lower part of the groove-like cooling water flow path, the metal plate spring member 44 is deformed, and the heat retaining rubber member 42 is generated by the elastic force generated when the deformation is returned. The metal base member 41 is urged so as to press against the wall surface on the cylinder bore side of the grooved cooling water flow path.

  The cooling water flow restraining resin member 43 has a wall surface on the cylinder bore side of the metal base member 41 and the lower part of the grooved cooling water flow path when the cylinder bore wall heat insulator 40 is installed in the lower part of the grooved cooling water flow path. It is a member for suppressing the cooling water flow which flows between wall surfaces on the opposite side. Since the cooling water flow suppressing resin member 43 is installed so as to block between the back surface of the metal base member 41 and the wall surface of the lower part of the grooved cooling water flow path (the wall surface opposite to the cylinder bore side), The cooling water is suppressed from flowing.

In other words, the cylinder bore wall heat insulator according to another embodiment of the present invention is installed in the middle and lower part of the grooved coolant flow path of the cylinder block of the internal combustion engine having the cylinder bore, and the bore wall on one half of the bore walls of all the cylinder bores Is a cylinder bore wall heat insulator for keeping warm.
Of the entire wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path, the wall surface on one half side is in contact with the shape on the cylinder bore side in the lower part of the grooved cooling water flow path. A heat insulating rubber member, a metal base member to which the heat insulating rubber member is fixed, and fixed to the back side of the metal base member, toward the wall surface on the cylinder bore side in the lower part of the grooved cooling water channel, A biasing member that biases the metal base member so as to press the heat retaining rubber member, and a wall surface of the metal base member and the cylinder bore side in the lower part of the grooved cooling water flow path fixed to the back side of the metal base member And a back side flow suppression member that suppresses the flow of cooling water between the opposite wall surface,
The heat retaining rubber member includes a heat retaining rubber member end bore for keeping the bore wall of the end bore at one end, a heat retaining rubber member end bore for keeping the bore wall of the end bore at the other end, Or a heat retaining rubber member end bore for keeping the bore wall of the end bore at one end, and a heat retaining rubber member end bore for keeping the bore wall of the other end bore. A heat insulation rubber member intermediate bore portion for keeping the respective bore walls of the intermediate bore, and
The metal base member is connected from the bore wall side of the end bore at one end to the bore wall side of the end bore at the other end,
One or more of the urging members are attached to each of the bore portions of the metal base member end bore portion and the metal base member intermediate bore portion,
That one or more back side flow restraining members are attached;
A cylinder bore wall heat insulator characterized by

  Examples of such a cylinder bore wall heat insulator according to another embodiment of the present invention include a cylinder bore wall heat insulator according to a third embodiment of the present invention and a cylinder bore wall heat insulator according to a fourth embodiment of the present invention described below. It is done.

A cylinder bore wall heat retaining device (hereinafter also referred to as a cylinder bore wall heat retaining device (3) of the present invention) according to a third embodiment of the present invention is a groove cooling of a cylinder block of an internal combustion engine having three or more cylinder bores. It is installed in the middle lower part of the water flow path, and is a cylinder bore wall heat insulator for keeping the bore wall of one half of the bore walls of all cylinder bores,
Of the entire wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path, the wall surface on one half side is in contact with the shape on the cylinder bore side in the lower part of the grooved cooling water flow path. A heat insulating rubber member, a metal base member to which the heat insulating rubber member is fixed, and fixed to the back side of the metal base member, toward the wall surface on the cylinder bore side in the lower part of the grooved cooling water channel, A biasing member that biases the metal base member so as to press the heat retaining rubber member, and a wall surface of the metal base member and the cylinder bore side in the lower part of the grooved cooling water flow path fixed to the back side of the metal base member And a back side flow suppression member that suppresses the flow of cooling water between the opposite wall surface,
The heat retaining rubber member includes a heat retaining rubber member end bore for keeping the bore wall of the end bore at one end, a heat retaining rubber member end bore for keeping the bore wall of the end bore at the other end, A heat retaining rubber member intermediate bore portion for keeping warm each bore wall of the one or more intermediate bores,
The metal base member is connected from the bore wall side of the end bore at one end to the bore wall side of the end bore at the other end,
One or more of the urging members are attached to each of the bore portions of the metal base member end bore portion and the metal base member intermediate bore portion,
That one or more back side flow restraining members are attached;
A cylinder bore wall heat insulator characterized by

A cylinder bore wall heat retaining device (hereinafter also referred to as a cylinder bore wall heat retaining device (4) of the present invention) according to a fourth embodiment of the present invention is a groove cooling of a cylinder block of an internal combustion engine having two cylinder bores. It is installed in the middle lower part of the water flow path, and is a cylinder bore wall heat insulator for keeping the bore wall of one half of the bore walls of all cylinder bores,
Of the entire wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path, the wall surface on one half side is in contact with the shape on the cylinder bore side in the lower part of the grooved cooling water flow path. A heat insulating rubber member, a metal base member to which the heat insulating rubber member is fixed, and fixed to the back side of the metal base member, toward the wall surface on the cylinder bore side in the lower part of the grooved cooling water channel, A biasing member that biases the metal base member so as to press the heat retaining rubber member, and a wall surface of the metal base member and the cylinder bore side in the lower part of the grooved cooling water flow path fixed to the back side of the metal base member And a back side flow suppression member that suppresses the flow of cooling water between the opposite wall surface,
The heat insulating rubber member is composed of a heat insulating rubber member end bore portion for keeping the bore wall of the end bore at one end, and a heat insulating rubber member end bore portion for keeping the bore wall of the end bore at the other end,
The metal base member is connected from the bore wall side of the end bore at one end to the bore wall side of the end bore at the other end,
The biasing member is attached to one or more metal base member end bores,
That one or more back side flow restraining members are attached;
A cylinder bore wall heat insulator characterized by

  The cylinder bore wall heat retaining device (3) of the present invention and the cylinder bore wall heat retaining device (4) of the present invention are the same except that the number of cylinder bores of the installed cylinder block is different.

  The cylinder bore wall heat insulator (3) or (4) according to the present invention is installed in the middle and lower part of the groove-like cooling water flow path of the cylinder block of the internal combustion engine. The cylinder block on which the cylinder bore wall heat insulator (3) of the present invention is installed is an open deck type cylinder block in which three or more cylinder bores are arranged in series, so that it has two end bores and one or more end bores. The cylinder bore is composed of an intermediate bore. Further, the cylinder block in which the cylinder bore wall heat insulator (4) according to the present invention is installed is an open deck type cylinder block in which two cylinder bores are arranged in series, so that a cylinder bore comprising two end bores is provided. have.

  The position where the heat insulator (3) or (4) on the cylinder bore wall according to the present invention is installed is the middle and lower part of the groove-like cooling water flow path.

  The heat retaining rubber member according to the heat retaining tool (3) or (4) of the cylinder bore wall according to the present invention is a member that keeps the middle and lower portions of the cylinder bore wall in contact with the wall surface on the cylinder bore side in the middle and lower portions of the grooved cooling water flow path. It is. Therefore, the shape on the contact surface side of the heat retaining rubber member is a shape along the wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path. Then, the heat retaining device (3) or (4) of the cylinder bore wall according to the present invention is installed in the middle and lower part of the groove-like cooling water flow path, so that the urging member pushes the metal base member, thereby maintaining heat. The rubber member is pressed while the contact surface side (surface side opposite to the metal base member side) is in contact with the wall surface on the cylinder bore side in the lower part of the groove-like cooling water flow path.

  The material of the heat retaining rubber member according to the heat retaining tool (3) or (4) of the cylinder bore wall of the present invention is the same as that of the heat retaining rubber member according to the heat retaining tool (1) of the cylinder bore wall of the present invention.

  The thickness of the heat insulating rubber member is not particularly limited and is appropriately selected.

  The metal base member is a member to which the heat retaining rubber member, the urging member, and the flow suppressing member are fixed. The metal base member is a member that uniformly presses the heat retaining rubber member against the wall surface on the cylinder bore side in the lower part of the grooved cooling water flow path by being pressed by the urging force of the urging member. Therefore, the shape of the metal base member is a shape along the back side (the surface side opposite to the contact surface) of the heat retaining rubber member.

  The material of the metal base member according to the heat insulator (3) or (4) of the cylinder bore wall of the present invention is the same as the material of the metal base member according to the heat insulator (1) of the cylinder bore wall of the present invention.

  The biasing member is fixed to the back side of the metal base member. This urging member has a metal base member toward the cylinder bore side wall surface in the lower part of the grooved cooling water flow path when the cylinder bore wall heat insulator of the present invention is installed in the lower part of the grooved cooling water flow path. Is a member for energizing the heat retaining rubber member so as to press it. The back side of the metal base member refers to the side opposite to the surface on which the heat retaining rubber member is fixed.

  Examples of the urging member include metal elastic members such as a metal leaf spring, a coil spring, a laminated leaf spring, and a torsion spring, and elastic rubber. The material of the metal elastic member is not particularly limited, but stainless steel (SUS), aluminum alloy, and the like are preferable in terms of good LLC resistance and high strength. The elastic rubber is not particularly limited, and examples thereof include solid rubber, expanded rubber, foamed rubber, soft rubber and other rubbers, and silicone-based gel materials. The cylinder bore wall heat insulator (1) according to the present invention is a solid rubber, expanded rubber, foam rubber, soft rubber, or other rubber or silicone-based gel-like material according to the cylinder bore wall heat retainer (3) or (4) of the present invention. This is the same as the rubber, such as solid rubber, expanded rubber, foamed rubber, and soft rubber, and the silicone-based gel-like material related to the heat retaining rubber member. The method of attaching the urging member to the metal base member is not particularly limited. For example, as in the embodiment shown in FIG. 18, a method of directly fixing the urging member 44 to the metal base member 41, or FIG. The urging member attaching member 54 in which the cut-off portion 52 is cut off is produced so that the vertically long urging member 53 is formed as shown in FIG. In addition, there is a method of fixing the urging member 53 to the rubber member 42 from the metal base member 41 side by bending the bent portion 55 and attaching the urging member to the metal base member. 18A is a perspective view, and FIG. 18B is an end view taken along line AA in FIG. 18A.

  In the heat insulator (3) for the cylinder bore wall according to the present invention, one or more urging members are attached to each of the bore portions of the metal base member end bore portion and the metal base member intermediate bore portion. That is, when the heat insulating device for the cylinder bore wall according to the present invention is viewed from above, the urging member is attached to at least one place in the arc direction of each of the bore portions of the metal base member end bore portion and the metal base member intermediate bore portion. ing.

  In the cylinder bore wall heat insulator (4) according to the present invention, one or more urging members are provided for each metal base member end bore portion. That is, when the heat insulator for the cylinder bore wall of the present invention is viewed from the upper side, each end bore portion of the metal base member end bore portion on one end bore side and the metal base member end bore portion on the other end bore side is provided. An urging member is attached to at least one place in the arc direction.

  The form, material, shape, size, installation position, number of installation, etc. of the urging member are adjusted to the shape of the grooved cooling water flow path so that the heat insulating rubber member is urged with an appropriate pressing force, It is selected appropriately.

  The back side flow suppressing member is fixed to the back side of the metal base member. This back side flow restricting member is provided with a metal base member and a wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path by installing the heat insulator for the cylinder bore wall of the present invention in the lower part of the grooved cooling water flow path. Is a member for suppressing the flow of cooling water flowing between the opposite wall surfaces.

  The back side flow suppressing member is not particularly limited, and examples thereof include rubber, resin, and metal plate. The back side flow suppressing member is preferably rubber or resin. The shape of the back side flow restricting member is such that when the heat insulator for the cylinder bore wall of the present invention is installed in the middle and lower part of the grooved cooling water flow path, If it is a shape which can suppress the cooling water flow between the wall surface on the opposite side to the wall surface on the side, it will not be restrict | limited.

  The back side flow restricting member is installed on the back side of the metal base member at one or more locations in the cooling water flow direction when the cylinder bore wall heat insulator (3) or (4) of the present invention is viewed from above. Yes. That is, the back-side flow restricting member is arranged so as to block the cooling water flow path at one or more places from the metal base member end bore portion at one end to the metal base member end bore portion at the other end. is set up. In the cylinder bore wall heat insulator (3) according to the present invention, at least one back side flow suppressing member is provided for each of the metal base member end bore part and the metal base member intermediate bore part. Is preferred. Further, in the heat retaining device (4) for the cylinder bore wall according to the present invention, it is preferable that one or more back side flow suppressing members are provided for each bore portion of the metal base member end bore portion.

  The form, material, shape, size, installation position, number of installations, etc. of the back side flow suppressing member are appropriately selected according to the shape of the grooved cooling water flow path so that the cooling water flow is suppressed. .

  In the cylinder bore wall heat retaining device (3) of the present invention, the heat retaining rubber member retains the heat retaining rubber member end bore portion for keeping the bore wall of the end bore at one end and the bore wall of the end bore at the other end. A heat retaining rubber member end bore portion and a heat retaining rubber member intermediate bore portion for warming each bore wall of the one or more intermediate bores. The wall surface on one half side of the wall surface on the cylinder bore side in the middle and lower part of the groove-like cooling water flow path of the cylinder block in which the cylinder bore wall heat insulator (3) of the present invention is installed, A wall surface on the end bore side and one or more wall surfaces on the intermediate bore side. In the cylinder bore wall heat retaining device (3) of the present invention, the heat insulating rubber member is in contact with the wall surface on the end bore side at one end, the wall surface on the other end bore side, and the wall surfaces on the one or more intermediate bore sides. It has a part to do.

  In the cylinder bore wall heat retaining device (4) of the present invention, the heat retaining rubber member retains the heat retaining rubber member end bore portion for keeping the bore wall of the end bore at one end and the bore wall of the end bore at the other end. And a heat retaining rubber member end bore portion. The wall surface on one side half of the wall surface on the cylinder bore side in the middle and lower part of the groove-like cooling water flow path of the cylinder block in which the cylinder bore wall heat retaining device (4) of the present invention is installed, There is a wall on the end bore side. In the heat retaining tool (4) for the cylinder bore wall according to the present invention, the heat retaining rubber member has a portion that contacts the wall surface on the end bore side of one end and the wall surface on the end bore side of the other end.

  In the heat retaining tool (3) for the cylinder bore wall according to the present invention, the heat retaining rubber member end bore for keeping the bore wall of the end bore at one end and the heat retaining for keeping each bore wall of the one or more intermediate bores. The rubber member intermediate bore portion and the heat retaining rubber member end bore portion for keeping the bore wall of the end bore at the other end may be continuous or may not be continuous. In the cylinder bore wall heat retaining device (3) of the present invention, the heat retaining rubber member end bore portion for keeping the bore wall of the end bore at one end and each bore wall of the one or more intermediate bores are kept warm. The heat insulation rubber member intermediate bore part and the heat insulation rubber member end bore part for keeping the bore wall of the end bore at the other end are continuous. This is preferable in that it is less likely to cause displacement due to vibration or the flow of cooling water in the water flow path. The same applies to the cylinder bore wall heat retaining device (4) of the present invention. In the cylinder bore wall heat retaining device (4) of the present invention, the heat retaining rubber member end bore for retaining the bore wall of the end bore at one end is used. And the heat retaining rubber member end bore for keeping the bore wall of the end bore at the other end may be continuous or may not be continuous. In the cylinder bore wall heat retaining device (4) of the present invention, the heat retaining rubber member end bore for keeping the bore wall of the end bore at one end and the heat insulation for keeping the bore wall of the end bore at the other end. It is preferable that the rubber member end bore portion is continuous from the viewpoint that the heat insulator of the cylinder bore wall is less likely to be displaced due to vibration or the flow of cooling water in the grooved cooling water flow path.

  In the heat retaining device (3) or (4) for the cylinder bore wall of the present invention, the heat retaining rubber member covers all the wall surfaces on the cylinder bore side of one half of the middle part of the grooved cooling water channel. Or, it may be a part of the wall surface on the cylinder bore side of one half of the middle lower part of the grooved cooling water flow path and cover only the part necessary for heat insulation in the middle lower part of the cylinder bore wall. Good.

  In the heat insulator (3) for the cylinder bore wall according to the present invention, the metal base member is connected from the bore wall side of the end bore at one end to the bore wall side of the end bore at the other end. That is, in the cylinder bore wall heat retaining device (3) of the present invention, the metal base member is a metal base member end bore portion on the bore wall side of the end bore on one end and the metal on each bore wall side of one or more intermediate bores. The base member intermediate bore portion is connected to the metal base member end bore portion on the bore wall side of the end bore at the other end. The metal base member includes a metal base member end bore portion on the bore wall side of one end bore, a metal base member intermediate bore portion on each bore wall side of one or more intermediate bores, and a bore wall of the other end bore. As long as the side metal base member end bore portion is connected, it may be formed of one metal plate or a plurality of metal plates connected together. The same applies to the cylinder bore wall heat retaining device (4) of the present invention. In the cylinder bore wall heat retaining device (4) of the present invention, the metal base member is connected to the other end from the bore wall side of the one end bore. It is connected to the bore wall side of the bore. That is, in the cylinder bore wall heat insulator (4) according to the present invention, the metal base member includes the metal base member end bore portion on the bore wall side of the end bore on one end and the metal base member on the bore wall side of the end bore on the other end. The end bore part is connected. In the cylinder bore wall heat insulator (4) according to the present invention, the metal base member includes a metal base member end bore portion on the bore wall side of the end bore at one end and a metal base member on the bore wall side of the end bore at the other end. As long as the end bore part is connected, it may be formed of one metal plate or a plurality of metal plates connected together.

  The internal combustion engine according to the first aspect of the present invention is provided on both the wall surface on one half side and the wall surface on the other half side of the entire wall surface on the cylinder bore side in the middle and lower part of the grooved coolant flow path. This is an internal combustion engine in which the cylinder bore wall heat insulator (1) or (2) is installed. The internal combustion engine according to the first aspect of the present invention is a form in which the whole of the middle and lower portions of the cylinder bore wall is kept warm by a heat insulator for the cylinder bore wall.

  The internal combustion engine according to the second aspect of the present invention has a cylinder bore wall heat retaining device of the present invention only on the wall surface on one side half side of all the wall surfaces on the cylinder bore side in the middle and lower part of the grooved coolant flow path ( An internal combustion engine characterized in that 1) or (2) is installed. The internal combustion engine according to the second aspect of the present invention is provided with a cylinder bore wall heat insulator only on one half side of either one of the middle and lower portions of the groove-shaped cooling water flow path, and the groove-shaped cooling water flow on the other half side. By not providing a cylinder bore wall heat insulator in the lower part of the path, only one half of the wall surface on the cylinder bore side in the middle lower part of the grooved coolant flow path is used as a heat insulator for the cylinder bore wall. It is a form to keep warm.

  The automobile of the present invention is an automobile characterized by having the internal combustion engine of the first aspect or the second aspect of the present invention.

  When all the wall surfaces on the cylinder bore side in the lower part of the grooved cooling water flow path are kept warm by a single heat insulator, in other words, the heat insulating part is formed so as to surround all the wall surfaces on the cylinder bore side in the lower part of the grooved cooling water flow path. If the insulation is pressed against a specific wall surface on the cylinder bore side in the lower part of the grooved cooling water flow path, the heat insulation will move into the grooved cooling water flow path on the opposite side. Since it is connected to the wall surface side on the lower cylinder bore side, the heat insulator is separated from the wall surface on the cylinder bore side in the lower part of the groove-like coolant channel on the opposite side.

  On the other hand, the cylinder bore wall heat insulators (1), (2), (3) and (4) according to the present invention are half of the wall surfaces on the cylinder bore side in the lower part of the grooved coolant flow path. Therefore, the cylinder bore wall heat insulators (1) to (4) of the present invention for keeping the wall surface of one half on the opposite side are not connected. Therefore, the cylinder bore wall heat insulators (1) to (4) according to the present invention are pressed against the wall surface on one side half on the cylinder bore side in the middle and lower part of the grooved cooling water flow path, even if they are pressed toward the wall surface. The cylinder bore wall heat insulators (1) to (4) of the present invention installed to keep the wall surface on one half of the side away from the wall surface on the cylinder bore side in the lower part of the groove-like cooling water flow path on the opposite side Such a force does not occur. Therefore, the cylinder bore wall heat insulators (1) to (4) of the present invention can be strongly pressed against the wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path. (1) to (4) are less likely to cause displacement due to vibration or the flow of cooling water in the grooved cooling water flow path. Furthermore, in the cylinder bore wall heat insulators (1) to (4) of the present invention, the metal base member is not divided for each bore part, but all are connected. The heat insulators (1) to (4) are unlikely to be displaced due to vibration or the flow of cooling water in the grooved cooling water flow path. Further, in the cylinder bore wall heat insulators (1) to (4) of the present invention, the urging and back-side flow suppressing member or the urging member is provided with each bore portion of the metal base member end bore portion and the metal base member intermediate bore portion. Since one or more are provided for each, the heat retaining rubber member is pressed evenly against the entire wall surface on one half-side of the cylinder bore side in the middle and lower part of the grooved cooling water flow path. Furthermore, in the cylinder bore wall heat insulators (1) to (4) of the present invention, the urging and back side flow suppressing member or the back side flow suppressing member suppresses the flow in the middle and lower part of the groove-like cooling water flow path. As a result, the flow in the upper part of the grooved cooling water flow path becomes faster. Therefore, the cooling efficiency of the upper part of the cylinder bore wall is increased. For this reason, the cylinder bore wall heat insulators (1) to (4) according to the present invention not only keep the inner and lower portions of the cylinder bore wall warm, but also increase the cooling efficiency of the upper portion of the cylinder bore wall. Since the difference in expansion between the upper part and the middle part can be reduced, the vibration of the piston can be prevented.

  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.

8 Lowermost part 9 Uppermost part 10 Middle position 11 Cylinder block 12 Bore 12a1, 12a2 End bore 12b1, 12b2 Intermediate bore 13 Cylinder bore wall 14 Grooved cooling water flow path 15 Cooling water supply port 16 Cooling water discharge port 17 Grooved cooling water flow Wall surfaces 17a and 17b on the cylinder bore side of the passage Out of all wall surfaces on the cylinder bore side of the groove-shaped cooling water flow path, wall surfaces 20 and 40 on the opposite side to the wall surface on the cylinder bore side of the half-hole wall 18 on the one side Thermal insulation members 21 and 41 Metal base member 22 and 42 Thermal insulation rubber member 23 Back side rubber member 24 Bending parts 25, 26 and 45 Contact surface 30 Metal plate 31 Cut-off parts 33 and 34 Rear side 35 Thermal insulation rubber member end bore part 36 Heat retaining rubber member intermediate bore portion 37 Metal base member end bore portion 38 Metal base member intermediate bore portion 43 Back side flow restraint Member 44 Biasing member 46 One end 47 Weld side end

Claims (9)

A cylinder bore wall heat insulator that is installed in the middle and lower part of a groove-like coolant flow path of a cylinder block of an internal combustion engine having a cylinder bore, and that keeps the bore wall of one half of the bore walls of all cylinder bores,
Of the entire wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path, the wall surface on one half side is in contact with the shape on the cylinder bore side in the lower part of the grooved cooling water flow path. A heat insulating rubber member, a metal base member to which the heat insulating rubber member is fixed, and fixed to the back side of the metal base member, toward the wall surface on the cylinder bore side in the lower part of the grooved cooling water channel, The metal base member is urged to press the heat retaining rubber member, and the cooling water flow between the metal base member and the wall surface on the opposite side to the wall surface on the cylinder bore side in the lower part of the grooved cooling water flow path is An urging and back side flow suppressing member for suppressing,
The heat retaining rubber member includes a heat retaining rubber member end bore for keeping the bore wall of the end bore at one end, a heat retaining rubber member end bore for keeping the bore wall of the end bore at the other end, Or a heat retaining rubber member end bore for keeping the bore wall of the end bore at one end, and a heat retaining rubber member end bore for keeping the bore wall of the other end bore. A heat insulation rubber member intermediate bore portion for keeping the respective bore walls of the intermediate bore, and
The metal base member is connected from the bore wall side of the end bore at one end to the bore wall side of the end bore at the other end,
One or more of the urging and back side flow suppressing members are provided for each of the bore portions of the metal base member end bore portion and the metal base member intermediate bore portion,
Cylinder bore wall thermal insulation. This is a cylinder bore wall heat insulator that is installed in the middle and lower part of a groove-like cooling water flow path of a cylinder block of an internal combustion engine having three or more cylinder bores, and that keeps one half of the bore walls of all cylinder bores warm. ,
Of the entire wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path, the wall surface on one half side is in contact with the shape on the cylinder bore side in the lower part of the grooved cooling water flow path. A heat insulating rubber member, a metal base member to which the heat insulating rubber member is fixed, and fixed to the back side of the metal base member, toward the wall surface on the cylinder bore side in the lower part of the grooved cooling water channel, The metal base member is urged to press the heat retaining rubber member, and the cooling water flow between the metal base member and the wall surface on the opposite side to the wall surface on the cylinder bore side in the lower part of the grooved cooling water flow path is An urging and back side flow suppressing member for suppressing,
The heat retaining rubber member includes a heat retaining rubber member end bore for keeping the bore wall of the end bore at one end, a heat retaining rubber member end bore for keeping the bore wall of the end bore at the other end, A heat retaining rubber member intermediate bore portion for keeping warm each bore wall of the one or more intermediate bores,
The metal base member is connected from the bore wall side of the end bore at one end to the bore wall side of the end bore at the other end,
One or more of the urging and back side flow suppressing members are provided for each of the bore portions of the metal base member end bore portion and the metal base member intermediate bore portion,
The heat insulating device for a cylinder bore wall according to claim 1, wherein: A cylinder bore wall heat insulator that is installed in the middle and lower part of a groove-like cooling water flow path of a cylinder block of an internal combustion engine having two cylinder bores, and that keeps the bore wall of one half of the bore walls of all cylinder bores,
Of the entire wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path, the wall surface on one half side is in contact with the shape on the cylinder bore side in the lower part of the grooved cooling water flow path. A heat insulating rubber member, a metal base member to which the heat insulating rubber member is fixed, and fixed to the back side of the metal base member, toward the wall surface on the cylinder bore side in the lower part of the grooved cooling water channel, The metal base member is urged to press the heat retaining rubber member, and the cooling water flow between the metal base member and the wall surface on the opposite side to the wall surface on the cylinder bore side in the lower part of the grooved cooling water flow path is An urging and back side flow suppressing member for suppressing,
The heat insulating rubber member is composed of a heat insulating rubber member end bore portion for keeping the bore wall of the end bore at one end, and a heat insulating rubber member end bore portion for keeping the bore wall of the end bore at the other end,
The metal base member is connected from the bore wall side of the end bore at one end to the bore wall side of the end bore at the other end,
One or more of the urging and back side flow suppressing members are provided for each metal base member end bore portion,
The heat insulating device for a cylinder bore wall according to claim 1, wherein: A cylinder bore wall heat insulator that is installed in the middle and lower part of a groove-like coolant flow path of a cylinder block of an internal combustion engine having a cylinder bore, and that keeps the bore wall of one half of the bore walls of all cylinder bores,
Of the entire wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path, the wall surface on one half side is in contact with the shape on the cylinder bore side in the lower part of the grooved cooling water flow path. A heat insulating rubber member, a metal base member to which the heat insulating rubber member is fixed, and fixed to the back side of the metal base member, toward the wall surface on the cylinder bore side in the lower part of the grooved cooling water channel, A biasing member that biases the metal base member so as to press the heat retaining rubber member, and a wall surface of the metal base member and the cylinder bore side in the lower part of the grooved cooling water flow path fixed to the back side of the metal base member And a back side flow suppression member that suppresses the flow of cooling water between the opposite wall surface,
The heat retaining rubber member includes a heat retaining rubber member end bore for keeping the bore wall of the end bore at one end, a heat retaining rubber member end bore for keeping the bore wall of the end bore at the other end, Or a heat retaining rubber member end bore for keeping the bore wall of the end bore at one end, and a heat retaining rubber member end bore for keeping the bore wall of the other end bore. A heat insulation rubber member intermediate bore portion for keeping the respective bore walls of the intermediate bore, and
The metal base member is connected from the bore wall side of the end bore at one end to the bore wall side of the end bore at the other end,
One or more of the urging members are attached to each of the bore portions of the metal base member end bore portion and the metal base member intermediate bore portion,
That one or more back side flow restraining members are attached;
Cylinder bore wall thermal insulation. This is a cylinder bore wall heat insulator that is installed in the middle and lower part of a groove-like cooling water flow path of a cylinder block of an internal combustion engine having three or more cylinder bores, and that keeps one half of the bore walls of all cylinder bores warm. ,
Of the entire wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path, the wall surface on one half side is in contact with the shape on the cylinder bore side in the lower part of the grooved cooling water flow path. A heat insulating rubber member, a metal base member to which the heat insulating rubber member is fixed, and fixed to the back side of the metal base member, toward the wall surface on the cylinder bore side in the lower part of the grooved cooling water channel, A biasing member that biases the metal base member so as to press the heat retaining rubber member, and a wall surface of the metal base member and the cylinder bore side in the lower part of the grooved cooling water flow path fixed to the back side of the metal base member And a back side flow suppression member that suppresses the flow of cooling water between the opposite wall surface,
The heat retaining rubber member includes a heat retaining rubber member end bore for keeping the bore wall of the end bore at one end, a heat retaining rubber member end bore for keeping the bore wall of the end bore at the other end, A heat retaining rubber member intermediate bore portion for keeping warm each bore wall of the one or more intermediate bores,
The metal base member is connected from the bore wall side of the end bore at one end to the bore wall side of the end bore at the other end,
One or more of the urging members are attached to each of the bore portions of the metal base member end bore portion and the metal base member intermediate bore portion,
That one or more back side flow restraining members are attached;
The heat insulating device for a cylinder bore wall according to claim 4, wherein: A cylinder bore wall heat insulator that is installed in the middle and lower part of a groove-like cooling water flow path of a cylinder block of an internal combustion engine having two cylinder bores, and that keeps the bore wall of one half of the bore walls of all cylinder bores,
Of the entire wall surface on the cylinder bore side in the middle and lower part of the grooved cooling water flow path, the wall surface on one half side is in contact with the shape on the cylinder bore side in the lower part of the grooved cooling water flow path. A heat insulating rubber member, a metal base member to which the heat insulating rubber member is fixed, and fixed to the back side of the metal base member, toward the wall surface on the cylinder bore side in the lower part of the grooved cooling water channel, A biasing member that biases the metal base member so as to press the heat retaining rubber member, and a wall surface of the metal base member and the cylinder bore side in the lower part of the grooved cooling water flow path fixed to the back side of the metal base member And a back side flow suppression member that suppresses the flow of cooling water between the opposite wall surface,
The heat insulating rubber member is composed of a heat insulating rubber member end bore portion for keeping the bore wall of the end bore at one end, and a heat insulating rubber member end bore portion for keeping the bore wall of the end bore at the other end,
The metal base member is connected from the bore wall side of the end bore at one end to the bore wall side of the end bore at the other end,
The biasing member is attached to one or more metal base member end bores,
That one or more back side flow restraining members are attached;
The heat insulating device for a cylinder bore wall according to claim 4, wherein:   The cylinder bore wall according to any one of claims 1 to 6, wherein both the wall surface on one half side and the wall surface on the other half side of all the wall surfaces on the cylinder bore side in the middle and lower part of the groove-like cooling water flow path are provided. An internal combustion engine in which a heat insulator is installed.   The cylinder bore wall heat insulator according to any one of claims 1 to 6 is installed only on one of the half wall surfaces on the cylinder bore side in the middle and lower part of the grooved coolant flow path. An internal combustion engine characterized by that.   An automobile comprising the internal combustion engine according to claim 7.

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