JP6960971B2 - Cylinder bore wall insulation - Google Patents

Description

The present invention relates to a cylinder bore wall heat insulating device used as a heat insulating material for a heat insulating device arranged in contact with a wall surface on the groove-shaped cooling water flow path side of the cylinder bore wall of a cylinder block of an internal combustion engine.

In an internal combustion engine, a fuel explosion occurs at the top dead center of the piston in the bore, and the piston is pushed down by the explosion. Therefore, the temperature is high on the upper side of the cylinder bore wall and low 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 expands less.
As a result, the frictional resistance of the piston with the cylinder bore wall increases, which is a factor that reduces fuel consumption. Therefore, it is required to reduce the difference in the amount of thermal deformation between the upper side and the lower side of the cylinder bore wall. ..

Therefore, the following attempts have been made in the past. That is, in order to make the wall temperature of the cylinder bore wall uniform, a spacer is installed in the groove-shaped cooling water flow path. The spacer adjusts the flow of the cooling water in the groove-shaped cooling water flow path to increase the cooling effect of the cooling water on the upper side of the cylinder bore wall and reduce the cooling effect on the lower side. For example, Patent Document 1 discloses a heat insulating device for a cylinder bore wall having the following configuration. The heat insulating tool for the cylinder bore wall includes a metal base member, a heat insulating rubber member, an urging / back side flow suppressing member, a heat insulating rubber member for the metal base member, an urging / back side flow suppressing member, and a fixing portion. And. The fixed portion is composed of a bent portion that is bent in a U shape.

Japanese Unexamined Patent Publication No. 2015-203315

By the way, when the cooling water enters between the heat insulating rubber member and the metal base member, the heat insulating rubber member floats up from the metal base member. As a result, the heat insulating rubber member may move together with the flow of the cooling water, and the heat insulating rubber member may fall off from the heat insulating tool.

Therefore, an object of the present invention is to provide a heat insulating tool for a cylinder bore wall that prevents the covering member from falling off from the heat insulating tool.

The above problem is solved by the following invention. That is, the heat insulating device for the cylinder bore wall of the present invention (1) is a covering member for contacting the wall surface on the cylinder bore side of the groove-shaped cooling water flow path through which the cooling water flows and covering the wall surface on the cylinder bore side of the groove-shaped cooling water flow path. When,
A back surface pressing member provided on the back surface side of the covering member and for pressing the covering member from the back surface side toward the wall surface on the cylinder bore side of the groove-shaped cooling water flow path.
A front side backing plate provided on the contact surface side of the covering member, having an opening, and sandwiching the outer edge portion of the covering member between the back side pressing member and the back surface side pressing member.
An elastic member attachment member provided on the back side of the back surface pressing member and attached with an elastic member that urges the back surface pressing member to press the covering member toward the wall surface.
One or more fixing portions for fixing the elastic member attachment member, the back surface pressing member, the covering member, and the front surface backing plate.
One or more beads provided on the front side backing plate at a position separated from the one or more fixing portions, projecting toward the covering member, and sandwiching the covering member with the back side pressing member.
Have.

Further, the heat insulating tool for the cylinder bore wall of the present invention (2) is the heat insulating tool for the cylinder bore wall according to (1), and the front side backing plate has a pair of curved sides and a pair of non-curved sides. Have and
The one or more fixing portions are provided at positions corresponding to the pair of non-curved sides, and are not provided at positions corresponding to the pair of curved sides.
The one or more beads are provided along the pair of curved sides.

Further, the heat insulating device for the cylinder bore wall of the present invention (3) is the heat insulating device for the cylinder bore wall according to (1).
The one or more beads are plural,
The front side backing plate has a pair of curved sides and a pair of non-curved sides.
The one or more fixing portions are provided at predetermined positions on the pair of curved sides.
The plurality of beads are provided on both sides of the pair of curved sides with the predetermined position in between.

Further, the heat insulating device for the cylinder bore wall of the present invention (4) is the heat insulating device for the cylinder bore wall according to any one of (1) to (3), and the covering member is from the one or more fixing portions. It has a first notch provided to remove the corners at the off position.

Further, the heat insulating device for the cylinder bore wall of the present invention (5) is the heat insulating device for the cylinder bore wall according to any one of (1) to (4), and the one or more fixing portions are plural. The covering member is sandwiched between a second notch provided at a position between the plurality of fixed portions and a bead provided adjacent to the second notch and the back surface pressing member. It has a holding portion to be held and a holding portion.

Further, the present invention (6) is the heat insulating device for the cylinder bore wall according to any one of (1) to (5).
The one or more fixed portions are plural, and there are a plurality of fixed portions.
The front side backing plate has a pair of curved sides and a pair of non-curved sides.
The plurality of fixing portions are provided at a plurality of positions on the pair of non-curved sides.
The bead is provided between the plurality of fixing portions along the pair of non-curved sides.

Further, the heat insulating device for the cylinder bore wall of the present invention (7) is a covering member for contacting the wall surface on the cylinder bore side of the groove-shaped cooling water flow path through which the cooling water flows and covering the wall surface on the cylinder bore side of the groove-shaped cooling water flow path. When,
A back surface pressing member provided on the back surface side of the covering member and for pressing the covering member from the back surface side toward the wall surface on the cylinder bore side of the groove-shaped cooling water flow path.
A front side backing plate provided on the contact surface side of the covering member, having an opening, and sandwiching the outer edge portion of the covering member between the covering member and the back surface side pressing member.
An elastic member attachment member provided on the back side of the back surface pressing member and attached with an elastic member that urges the back surface pressing member to press the covering member toward the wall surface.
One or more fixing portions for fixing the elastic member attachment member, the back surface pressing member, the covering member, and the front surface backing plate.
One or more beads provided on the front side backing plate at a position separated from the fixing portion and projecting toward the back side pressing member.
One or more through holes provided in the covering member through which the one or more beads pass, and
Have.

Further, the heat insulating device for the cylinder bore wall of the present invention (8) is a covering member for contacting the wall surface on the cylinder bore side of the groove-shaped cooling water flow path through which the cooling water flows and covering the wall surface on the cylinder bore side of the groove-shaped cooling water flow path. When,
A back surface pressing member provided on the back surface side of the covering member and for pressing the covering member from the back surface side toward the wall surface on the cylinder bore side of the groove-shaped cooling water flow path.
A front side backing plate provided on the contact surface side of the covering member, having an opening, and sandwiching the outer edge portion of the covering member between the back side pressing member and the back surface side pressing member.
An elastic member attachment member provided on the back side of the back surface pressing member and attached with an elastic member that urges the back surface pressing member to press the covering member toward the wall surface.
One or more fixing portions for fixing the elastic member attachment member, the back surface pressing member, the covering member, and the front surface backing plate.
One or more beads provided on the back side pressing member at a position separated from the fixing portion, projecting toward the covering member, and sandwiching the covering member with the front side backing plate.
Have.

Further, the heat insulating tool for the cylinder bore wall of the present invention (9) is the heat insulating tool for the cylinder bore wall according to (8), and the back surface pressing member has a pair of curved sides and a pair of non-curved sides. Have and
The one or more fixing portions are provided at positions corresponding to the pair of non-curved sides, and are not provided at positions corresponding to the pair of curved sides.
The one or more beads are provided along the pair of curved sides.

Further, the heat insulating device for the cylinder bore wall of the present invention (10) is the heat insulating tool for the cylinder bore wall according to (8).
The one or more beads are plural,
The back side pressing member has a pair of curved sides and a pair of non-curved sides.
The plurality of fixing portions are provided at predetermined positions on the pair of curved sides.
The plurality of beads are provided on both sides of the pair of curved sides with the predetermined position in between.

Further, the heat insulating device for the cylinder bore wall of the present invention (11) is the heat insulating device for the cylinder bore wall according to any one of (8) to (10).
The one or more fixed portions are plural, and there are a plurality of fixed portions.
The front side backing plate has a pair of curved sides and a pair of non-curved sides.
The plurality of fixing portions are provided at a plurality of positions on the pair of non-curved sides.
The plurality of beads are provided between the plurality of fixed portions along the pair of non-curved sides.

Further, the heat insulating device for the cylinder bore wall of the present invention (12) is a covering member for contacting the wall surface on the cylinder bore side of the groove-shaped cooling water flow path through which the cooling water flows and covering the wall surface on the cylinder bore side of the groove-shaped cooling water flow path. When,
A back surface pressing member provided on the back surface side of the covering member and for pressing the covering member from the back surface side toward the wall surface on the cylinder bore side of the groove-shaped cooling water flow path.
A front side backing plate provided on the contact surface side of the covering member, having an opening, and sandwiching the outer edge portion of the covering member between the covering member and the back surface side pressing member.
An elastic member attachment member provided on the back side of the back surface pressing member and attached with an elastic member that urges the back surface pressing member to press the covering member toward the wall surface.
One or more fixing portions for fixing the elastic member attachment member, the back surface pressing member, the covering member, and the front surface backing plate.
One or more beads that are provided on the back side pressing member at a position separated from the fixing portion and project toward the front side backing plate side.
A plurality of through holes provided in the covering member through which the one or more beads are passed, and
Have.

According to the present invention, it is possible to provide a heat insulating device for a cylinder bore wall in which a covering member is prevented from falling off from a fixed portion.

It is a schematic plan view which shows the form example of the cylinder block in which the heat insulator of the cylinder bore wall of this invention is installed. It is sectional drawing along the position of the F2-F2 line of FIG. It is a perspective view of the cylinder block shown in FIG. It is a schematic plan view which shows the form example of the cylinder block in which the heat insulator of the cylinder bore wall of this invention is installed. It is a schematic front view which shows 1st Embodiment of the heat insulating device of the cylinder bore wall of this invention. It is an exploded perspective view which shows the heat insulating device of the cylinder bore wall shown in FIG. FIG. 5 is a front view showing a state in which the front side backing plate is removed from the heat insulating device of the cylinder bore wall shown in FIG. FIG. 5 is a plan view showing a state in which the heat insulating device of the cylinder bore wall shown in FIG. 5 is in contact with the cylinder bore wall. It is a schematic front view which shows the 2nd Embodiment of the heat insulating device of the cylinder bore wall of this invention. It is a front view which shows the state which the front side backing plate was removed from the heat insulating tool of the cylinder bore wall shown in FIG. It is a schematic front view which shows the 3rd Embodiment of the heat insulating device of the cylinder bore wall of this invention. It is a front view which shows the state which the front side backing plate was removed from the heat insulating tool of the cylinder bore wall shown in FIG. It is sectional drawing which follows the position of the F13-F13 line of FIG. It is sectional drawing which shows the part A of FIG. 13 enlarged. It is a schematic front view which shows the 4th Embodiment of the heat insulating device of the cylinder bore wall of this invention. FIG. 5 is a front view showing a state in which the front side backing plate is removed from the heat insulating device of the cylinder bore wall shown in FIG. It is a schematic front view which shows the 5th Embodiment of the heat insulating device of the cylinder bore wall of this invention. FIG. 6 is a front view showing a state in which the front side backing plate is removed from the heat insulating device of the cylinder bore wall shown in FIG. It is a schematic front view which shows the 6th Embodiment of the heat insulating device of the cylinder bore wall of this invention. It is a front view which shows the state which the front side backing plate was removed from the heat insulating tool of the cylinder bore wall shown in FIG. It is a schematic front view which shows the 7th Embodiment of the heat insulating device of the cylinder bore wall of this invention. FIG. 21 is a front view showing a state in which the front side backing plate and the covering member are removed from the heat insulating device of the cylinder bore wall shown in FIG. 21. It is sectional drawing which follows the position of the F23-F23 line of FIG. It is sectional drawing which shows the part B of FIG. 23 enlarged. It is a schematic cross-sectional view which shows the 8th Embodiment of the heat insulating device of the cylinder bore wall of this invention. It is a schematic front view which shows the 9th Embodiment of the heat insulating device of the cylinder bore wall of this invention. It is a schematic front view which shows the tenth embodiment of the heat insulating device of the cylinder bore wall of this invention. It is a schematic front view which shows the eleventh embodiment of the heat insulating device of the cylinder bore wall of this invention. It is sectional drawing along the position of the F29-F29 line of the heat insulating device of the cylinder bore wall of FIG. 28.

The heat insulating device for the cylinder bore wall of the present invention has a covering member (rubber member) for contacting the wall surface on the cylinder bore side of the groove-shaped cooling water flow path through which the cooling water flows and covering the wall surface on the cylinder bore side of the groove-shaped cooling water flow path. A back-side pressing member provided on the back surface side of the covering member for pressing the covering member from the back surface side toward the wall surface on the cylinder bore side of the groove-shaped cooling water flow path, and a contact surface side of the covering member. A front side backing plate having an opening for sandwiching the outer edge portion of the covering member between the back side pressing member and the back side pressing member provided on the back side of the covering member, and facing the wall surface. An elastic member attachment member to which an elastic member for urging the back side pressing member to press the covering member, the elastic member attachment member, the back side pressing member, the covering member, and the front side Between one or more fixing portions for fixing the backing plate and the back side pressing member provided on the front side backing plate at a position separated from the one or more fixing portions and projecting toward the covering member. It has one or more beads that sandwich the covering member.

The covering member may be a square flat plate, or may be curved in an arc shape along the shape of the bore wall. The covering member may have the shape shown in FIG. 6, for example. The shape and thickness of the covering member are not particularly limited and are appropriately selected.

The covering member is preferably made of an elastic body. Examples of the material of the covering member include rubbers such as solid rubber, expanded rubber, foam rubber, and soft rubber, silicone-based gel-like materials, and cellulose-based sponges. Installation of the cylinder bore wall insulation in that when the cylinder bore wall insulation is installed in the grooved cooling water flow path, it is possible to prevent the covering member from coming into strong contact with the cylinder bore wall and scraping the covering member. Later, it is preferably composed of an expanded rubber or a cellulosic sponge capable of expanding the covering member in the groove-shaped cooling water flow path. The expansion rubber is preferably a heat-sensitive expansion rubber or a water-swellable rubber. The cellulosic sponge can be expanded by absorbing cooling water. When the material of the covering member is a material that does not expand in the groove-shaped cooling water flow path, the urging force is generated exclusively by the elastic portion, and the material of the covering member is a material that expands in the groove-shaped cooling water flow path. In the case, the urging force is generated by the joint of the elastic part and the covering member.

Examples of the composition of the solid rubber include natural rubber, butadiene rubber, ethylene propylene diene rubber (EPDM), nitrile butadiene rubber (NBR), silicone rubber, and fluororubber. Solid rubber has almost no expandability. When the covering member is made of solid rubber, as shown in FIG. 29, the covering member is formed so that the central protruding portion of the covering member protrudes toward the cylinder bore wall side from the opening of the front side contact plate.

Examples of the expansion rubber include heat-sensitive expansion rubber. The heat-sensitive expansion rubber is a composite obtained by impregnating a base foam material with a thermoplastic substance having a melting point lower than that of the base foam material and compressing the rubber. Moreover, it is a material in which the cured product of the thermoplastic substance is softened by heating and the compressed state is released. Examples of the heat-sensitive expansion rubber include the heat-sensitive expansion rubber described in JP-A-2004-143262. When the material of the rubber member is heat-sensitive expansion rubber, the heat insulating device of the cylinder bore wall of the present invention is installed in the groove-shaped cooling water flow path, and heat is applied to the heat-sensitive expansion rubber, so that the heat-sensitive expansion rubber expands and is predetermined. It expands and deforms into the shape of.

Examples of the base foam material related to the heat-sensitive expansion rubber include various polymer materials such as rubber, elastomer, thermoplastic resin, and thermosetting resin. Specific examples thereof include natural rubber, chloropropylene rubber, styrene-butadiene rubber, and nitrile. Examples include various synthetic rubbers such as butadiene rubber, ethylene propylene diene ternary copolymer, silicone rubber, fluororubber, and acrylic rubber, various elastomers such as soft urethane, and various thermocurable resins such as hard urethane, phenol resin, and melamine resin. Be done.

The thermoplastic substance for the heat-sensitive expansion rubber preferably has a glass transition point, a melting point, or a softening temperature of less than 120 ° C. Examples of the thermoplastic substance related to the heat-sensitive expansion rubber include polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyvinylidene chloride, vinyl acetate, polyacrylic acid ester, styrene-butadiene copolymer, chlorinated polyethylene, polyvinylidene fluoride, and ethylene-acetic acid. Vinyl copolymer, ethylene vinyl acetate vinyl acetate acrylic acid ester copolymer, ethylene vinyl acetate acrylic acid ester copolymer, ethylene vinyl acetate vinyl acetate copolymer, nylon, acrylonitrile butadiene copolymer, polyacrylonitrile, thermoplastic , Polychloroprene, polybutadiene, thermoplastic polyimide, polyacetal, polyphenylene sulfide, polycarbonate, thermoplastic resins such as thermoplastic polyurethane, and various thermoplastic compounds such as low melting point glass frit, starch, solder, and wax.

Further, examples of the expandable rubber include water-swellable rubber. The water-swellable rubber is a material to which a water-absorbing substance is added to rubber, and is a rubber material having a shape-retaining property that absorbs water, swells, and retains an expanded shape. Examples of the water-swellable rubber include a rubber material in which a water-absorbent substance such as a crosslinked product of a neutralized polyacrylic acid, a crosslinked product of a starch acrylic acid graft copolymer, a crosslinked carboxymethyl cellulose salt, and polyvinyl alcohol is added to the rubber. Can be mentioned. Examples of the water-swellable rubber include a water-swellable rubber containing a ketimated polyamide resin, a glycidyl etherified product, a water-absorbent resin, and a rubber described in JP-A-9-208752. When the material of the rubber member is water-swellable rubber, the heat insulator of the cylinder bore wall of the present invention is installed in the groove-shaped cooling water flow path to allow the cooling water to flow, and the water-swellable rubber absorbs water to cause water. The swellable rubber expands and expands and deforms into a predetermined shape.

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

When the material of the covering member is a material capable of containing water such as water-swellable rubber and foamed rubber, the heat insulating device for the cylinder bore wall of the present invention is installed in the groove-shaped cooling water flow path, and the groove-shaped cooling water flow path is provided. The covering member contains water when the cooling water is poured into the water. The range of the water content of the rubber member when the cooling water is flowed through the groove-shaped cooling water flow path is appropriately selected depending on the operating conditions of the internal combustion engine and the like. The water content refers to the weight water content represented by (cooling water weight / (filler weight + cooling water weight)) × 100.

The back side pressing member may have a square flat plate shape, or may be curved in an arc shape along the shape of the bore wall. The back side pressing member may be formed so as to form an arc shape by connecting a plurality of plates. The back side pressing member may be formed of, for example, a stainless steel plate. The back side pressing member may have, for example, the shapes shown in FIGS. 5 and 6. The back side pressing member may be omitted from the heat insulating device on the cylinder bore wall.

The front side backing plate may be a square frame-shaped flat plate, and may be curved in an arc shape along the shape of the bore wall. The front side backing plate may be formed so as to be bendable in an arc shape by rotatably connecting a plurality of flat plates to each other. The front side backing plate may be formed of a metal plate, for example, a stainless steel plate. The front side backing plate may have, for example, the shapes shown in FIGS. 5 and 6. The front side backing plate has an opening.

The elastic member attachment member may have a frame portion having a frame shape. The elastic member attachment member may be curved in an arc shape along the shape of the bore wall. The elastic member attachment member may be formed so as to form an arc shape by connecting a plurality of plates. The elastic member attachment member may have a leg portion that is provided so as to project downward from the frame portion. The member attached to the elastic member may have a stopper portion that is provided so as to project upward from the frame portion to prevent lifting. The elastic member attachment member may have, for example, the shapes shown in FIGS. 6 and 23.

The one or more fixing portions may be a plurality of first fixing portions provided corresponding to the pair of non-curved sides of the front side backing plate. The number of fixed portions may be one, or a plurality of fixed portions may be provided. The fixing portion may be a plurality of second fixing portions provided corresponding to the pair of curved sides of the front side backing plate. The fixing portion may be provided on the outer peripheral portion (near the outer edge) of the heat insulating device. The fixing portion may be arranged, for example, in FIGS. 5, 9, 11, 15, 17, 17, 19, 21, 26, and 27. The fixing portion may be formed by a crimped portion, a screw, a rivet, an eyelet, welding, brazing, burring, or the like.

One or more beads may be provided on the front side contact plate and project toward the back side pressing member, or may be provided on the back side pressing member and project toward the front side contact plate. The bead may be one or a plurality of beads. The bead arrangement can be various. For example, the beads may be arranged in series along the flow direction of the cooling water as shown in FIGS. 5, 9, 11, 15, and 22, and one elongated bead may be arranged in series as shown in FIGS. 17 and 26. It may be arranged along the flow direction of the cooling water as described above. The plurality of beads may be arranged in a frame shape or a frame shape as shown in FIGS. 19 and 27.

The covering member may have one or more through holes, and one or more beads may be passed inside the one or more through holes. There may be one through hole or a plurality of through holes. The arrangement of the through holes can be as shown in FIG. The covering member may have a first notch provided to remove the corners. The covering member may have a second notch provided at a position between the plurality of fixing portions.
[First Embodiment]

1 to 4 show an open deck type cylinder block 12 of a vehicle-mounted internal combustion engine in which a heat insulating device 11 for a cylinder bore wall is installed. The cylinder block 12 has a plurality of bores 13 for moving the piston up and down, a groove-shaped cooling water flow path 14 for flowing cooling water, and a cylinder bore wall 15. The cylinder bore wall 15 separates each bore 13 from the groove-shaped cooling water flow path 14. Further, the cylinder block 12 has a cooling water supply port 16 for supplying cooling water to the groove-shaped cooling water flow path 14, and a cooling water discharge port 17 for discharging the cooling water from the groove-shaped cooling water flow path 14. Have. The cooling water supply port 16 is provided near one end of a bore row 18 composed of a plurality of bores 13. The cooling water discharge port 17 is provided near the other end of the bore row 18 opposite to one end. The number of bores 13 included in the cylinder block 12 is arbitrary.

Cooling water flows through the groove-shaped cooling water flow path 14 from the cooling water supply port 16 toward the cooling water discharge port 17 at a predetermined flow rate. The cooling water is composed of general engine cooling water such as LLC.

The cylinder block 12 is formed so that two or more bores 13 are arranged in series. Therefore, the bore 13 includes an end bore 13A provided at the end of the bore row 18 and an intermediate bore 13B sandwiched between the two bores 13 (note that the number of bores 13 of the cylinder block 12 is two). In this case, only the end bore 13A is used.)

Of the bores 13 arranged in series, the end bores 13A are the bores at both ends, and the intermediate bore 13B is the bore between the end bore 13A at one end and the end bore 13A at the other end. The wall between the end bore 13A and the intermediate bore 13B, the wall between the intermediate bore 13B and the intermediate bore 13B, and the wall between the intermediate bore 13B and the end bore 13A (inter-bore wall 21) are sandwiched between the two bores 13. It is a part. Therefore, since heat is transferred from the two cylinder bores 13 to the bore wall 21, the wall temperature is higher than that of the other walls. Therefore, on the wall surface 22 on the cylinder bore side of the groove-shaped cooling water flow path, the temperature is highest in the vicinity of the inter-bore wall 21. Therefore, among the wall surface 22 on the cylinder bore side of the groove-shaped cooling water flow path 14, the cylinder bore of each bore 13 The temperature at and near the boundary of the wall 15 is the highest.
In the present invention, the wall surface on the cylinder bore 13 side of the wall surface of the groove-shaped cooling water flow path 14 is described as the wall surface 22 on the bore side of the groove-shaped cooling water flow path 14, and the wall surface of the groove-shaped cooling water flow path 14 is grooved. The wall surface of the cooling water flow path opposite to the wall surface 17 on the cylinder bore side is referred to as a wall surface 23.

As shown in FIG. 4, the cylinder bore wall 15 corresponds to the first bore wall 15A corresponding to the end bore 13A and the second bore corresponding to the intermediate bore 13B and having a shorter length (perimeter) than the first bore wall 15A. Includes wall 15B.

As shown in FIG. 1, the heat insulating tool 11 on the cylinder bore wall is preferably provided in the vicinity of the cooling water supply port 16. The heat insulating tool 11 on the cylinder bore wall is provided at a position facing the cooling water supply port 16. By adopting this arrangement, the heat insulating tool 11 on the cylinder bore wall is in close contact with a part of the first bore wall 15A to keep the part of the first bore wall 15A warm, and the first one in the vicinity of the cooling water supply port 16. It is possible to prevent overcooling of the bore wall 15A. Therefore, the temperature of the cylinder bore wall 15 in the vicinity of the cooling water supply port 16 can be made equal to the temperature of the other cylinder bore walls 15 to contribute to the improvement of the fuel efficiency of the vehicle.

The arrangement of the heat insulating tool 11 on the cylinder bore wall is an example. The heat insulating device 11 on the cylinder bore wall may be provided, for example, at a position where the end bore 13A is in close contact with another portion different from the above-mentioned portion of the first bore wall 15A of the end bore 13A, in response to other practical requirements. , The intermediate bore 13B may be provided at a position in close contact with the second bore wall 15B, or may be provided at a position other than those.

As shown in FIGS. 5 and 6, the heat insulating device 11 on the cylinder bore wall has an elastic member attachment 24 having an arc shape when viewed from above and an arc shape when viewed from above, in order from the rear. It has a back side pressing member 25, a square flat plate-shaped covering member 26, and a front side backing plate 27 having an arc shape when viewed from above. The elastic member attachment member 24, the back side pressing member 25, the covering member 26, and the front side backing plate 27 are stacked in this order. A plurality of elastic members 28 are attached to the elastic member attachment member 24.

The heat insulating device 11 has a fixing member 31. The fixing member 31 fixes the elastic member attachment member 24, the back side pressing member 25, the covering member 26, and the front side backing plate 27 to each other. The fixing member 31 is provided integrally with the elastic member attachment member 24 as an example, but may be provided separately from the elastic member attachment member 24.

The fixing member 31 is provided corresponding to a plurality of first fixing portions 31A provided corresponding to the pair of non-curved sides 41 of the front side contact plate 27 and the pair of curved sides 42 of the front side contact plate 27. It also has a plurality of second fixing portions 31B. The plurality of first fixing portions 31A and the plurality of second fixing portions 31B are all provided on the outer peripheral portion (near the outer edge) of the heat insulating device 11.

The first fixing portion 31A is formed as a sheet metal extending in the vertical direction (direction orthogonal to the flow direction of the cooling water), and is continuously provided over the entire length of the heat insulating tool 11 in the vertical direction. One of the first fixing portions 31A is provided at the left end portion of the heat insulating tool 11, and the other one of the first fixing portion 31A is provided at the right end portion of the heat insulating tool 11.

The second fixing portion 31B is formed in a strip shape as a sheet metal extending in the lateral direction with a predetermined width. The plurality of second fixing portions 31B are located at positions moved from the left end of the curved side 42 of the front side backing plate 27 by a length of 1/3 of the total length of the curved side 42, and the curved side 42 of the front side backing plate 27. A total of 4 is the sum of the position moved from the right end of the curved side 42 by the length of 1/3 of the total length of the curved side 42 and the two locations (the upper second fixed portion 31B and the lower second fixed portion 31B). Place).

The first fixing portion 31A and the second fixing portion 31B are sheet metal formed so as to protrude from the elastic member attachment member 24, and are bent into a substantially U shape by being caulked (bent) by a press machine. There is. Therefore, the first fixing portion 31A and the second fixing portion 31B form a sandwiching portion. The first fixing portion 31A and the second fixing portion 31B have a back side pressing member 25, a covering member 26, and a front side backing plate between the first fixing portion 31A and the second fixing portion 31B and the elastic member attachment member 24. 27 can be sandwiched and held. The first fixing portion 31A and the second fixing portion 31B fix the elastic member attachment member 24, the back side pressing member 25, the covering member 26, and the front side backing plate 27 to each other.

The fixing member 31 is not limited to the bending process of the sheet metal, and may be formed by, for example, screws, rivets, eyelets, welding, brazing, burring, or the like.

As shown in FIG. 6, the elastic member attachment member 24 is formed by bending a substantially rectangular flat plate so as to be curved along the cylinder bore wall 15. The elastic member attachment member 24 is formed of a metal plate, for example, a stainless steel plate. The elastic member attachment member 24 includes a frame portion 43 having a frame shape, a window portion 43A provided inside the frame portion 43, a leg portion 44 provided so as to project downward from the frame portion 43, and a frame portion 43. It has a stopper portion 45 for preventing lifting, which is provided so as to project upward from the surface. The legs 44 may be bent in an “L” shape, for example, and may abut on the bottom of the groove-shaped cooling water flow path 14 to support the entire heat insulating tool 11. The stopper portion 45 may be bent in an inverted “L” shape, for example, and abuts on the cylinder head side to prevent the heat insulating tool 11 from floating from the groove-shaped cooling water flow path 14.

As described above, the elastic member attachment member 24 is provided with a plurality of elastic members 28. Each elastic member 28 is composed of an elongated metal leaf spring. Each elastic member 28 is obliquely upward from the frame portion 43 in the direction of the opposite wall 23 on the side opposite to the wall surface 22 of the cylinder bore wall 15 of the groove-shaped cooling water flow path 14 (the direction away from the front side contact plate 27). It protrudes in the direction. The elastic member 28 has a shaft portion 28A integrally provided with the frame portion 43 and protruding from the frame portion 43, and a contact portion 28B provided at the tip end portion of the shaft portion 28A. The contact portion 28B is arranged so as to bend with respect to the shaft portion 28A, and can contact the opposite wall 23 on the side opposite to the wall surface 22 on the cylinder bore 13 side.

As shown in FIG. 6, the back surface side pressing member 25 is formed by bending a rectangular flat plate so as to be curved along the cylinder bore wall 15. The back side pressing member 25 is formed of a metal plate, for example, a stainless steel plate. The back side pressing member 25 may be omitted from the heat insulating device 11 on the cylinder bore wall.

As shown in FIGS. 5 and 6, the covering member 26 has a rectangular flat plate shape and is formed so as to be curved along the cylinder bore wall 15. The covering member 26 is preferably made of a rubber material having a property of expanding with increasing temperature, that is, a heat-sensitive expansion rubber. Therefore, the covering member 26 can expand during the operation of the internal combustion engine and come into direct contact with the cylinder bore wall 15 to cover the heat insulating portion of the cylinder bore wall 15 without a gap. As a result, the covering member 26 can keep the cylinder bore wall 15 (second bore wall 15B) warm.

As the material of the covering member 26, in consideration of LLC resistance (resistance to antifreeze cooling water) and heat resistance, for example, rubber such as solid rubber, expanded rubber, foam rubber, soft rubber, and silicone gel-like material. And so on. As the material of the covering member 26, it is preferable to use expansion rubber, and it is more preferable to use heat-sensitive expansion rubber.

As shown in FIGS. 5 and 6, the front side backing plate 27 is formed by bending a square frame-shaped flat plate so as to be curved along the cylinder bore wall 15. The front side backing plate 27 has a rectangular opening 46. The front side backing plate 27 is formed of a metal plate, for example, a stainless steel plate. The front side backing plate 27 has a pair of non-curved sides 41 extending in the vertical direction and a pair of curved sides 42 extending in the horizontal direction. Further, the front side backing plate 27 has a pair of vertical frame portions 27A extending in the vertical direction corresponding to the pair of non-curved sides 41 and a pair of horizontal frame portions 27B extending in the horizontal direction corresponding to the pair of curved sides 42. And have. One vertical frame portion 27A on the left side is sandwiched and held by one first fixed portion 31A on the left side. One vertical frame portion 27A on the right side is sandwiched and held by one first fixed portion 31A on the right side.

The horizontal frame portion 27B of the front side backing plate 27 has a plurality of beads 51. The plurality of beads 51 are provided on both sides of the second fixing portion 31B. Alternatively, it can be said that the plurality of beads 51 are provided between the second fixing portions 31B.

Each bead 51 extends laterally along the curved side 42 of the front side backing plate 27. The bead 51 is provided so as to project toward the covering member 26 (back surface side pressing member 25) so as to be convex. The plurality of beads 51 are provided in series in the horizontal frame portion 27B.

The operation of the heat insulating device 11 on the cylinder bore wall of the present embodiment will be described. The covering member 26 expands as the temperature of the cooling water rises, and as shown in FIG. 8, it can come into close contact with the cylinder bore wall 15 (first bore wall 15A) and cover the surface of the cylinder bore wall 15 (first bore wall 15A) without gaps. In the present embodiment, since the beads 51 are provided on both sides of the second fixing portion 31B in between, cooling water may enter between the back side pressing member 25 and the covering member 26 from this position. Be prevented. This prevents the cooling water from entering between the back surface side pressing member 25 and the covering member 26 at the position where the bead 51 is provided. Therefore, it is possible to prevent a problem that the covering member 26 that has risen from the back surface side pressing member 25 falls off.

According to this embodiment, the following can be said. The heat insulating tool 11 on the cylinder bore wall comes into contact with the wall surface 22 on the cylinder bore 13 side of the groove-shaped cooling water flow path 14 through which the cooling water flows, and the covering member 26 for covering the wall surface 22 on the cylinder bore 13 side of the groove-shaped cooling water flow path 14. And the back side pressing member 25 provided on the back side of the covering member 26 and for pressing the covering member 26 from the back side toward the wall surface 22 on the cylinder bore 13 side of the groove-shaped cooling water flow path 14, and the covering. A front side contact plate 27 for sandwiching the outer edge portion of the covering member 26 between the member 26 and the back side pressing member 25, which is provided on the contact surface side of the member 26 and has an opening 46, and the back side pressing member. An elastic member attachment member 24 provided on the back surface side of the 25 and having an elastic member 28 attached so that the back surface side pressing member 25 presses the covering member 26 toward the wall surface 22, and the elasticity. One or more fixing portions for fixing the member attachment member 24, the back side pressing member 25, the covering member 26, and the front side backing plate 27, and the position separated from the one or more fixing portions. It has one or more beads 51 which are provided on the front side backing plate 27, project toward the covering member 26, and sandwich the covering member 26 with the back side pressing member 25.

According to this configuration, since one or more beads 51 are provided at positions separated from the fixed portion, the pressure for compressing the covering member 26 can be increased at the position of the beads 51. Therefore, the adhesion of the covering member 26 to the back surface pressing member 25 is improved at the position where the bead 51 is provided, and it is possible to prevent a gap from being formed between the back surface pressing member 25 and the covering member 26. Therefore, the cooling water in the groove-shaped cooling water flow path 14 is prevented from entering between the back surface side pressing member 25 and the covering member 26. As a result, it is possible to prevent the covering member 26 that has risen from the back-side pressing member 25 from falling off from the heat insulating device 11.

Further, by providing the bead 51, the holding force for holding the covering member 26 between the back side pressing member 25 and the front side backing plate 27 is increased, so that the covering member 26 is torn by the water flow of the cooling water. Alternatively, it is possible to prevent the covering member 26 from falling off from the heat insulating device 11.

The front side backing plate 27 has a pair of curved sides 42 and a pair of non-curved sides 41, and the one or more fixing portions are provided at predetermined positions of the pair of curved sides 42. The plurality of beads 51 are provided on both sides of the pair of curved sides 42 with the predetermined position interposed therebetween. According to this configuration, since the beads 51 are provided on both sides of the fixing portion in between, the adhesion of the covering member 26 to the back surface side pressing member 25 can be improved in the portion where the fixing portion is not provided. As a result, the cooling water in the groove-shaped cooling water flow path 14 is prevented from entering between the back surface side pressing member 25 and the covering member 26. Further, the holding force for holding the covering member 26 between the back side pressing member 25 and the front side backing plate 27 can be enhanced. Therefore, it is possible to prevent the covering member 26 from being torn by the flow of the cooling water or the covering member 26 from falling off from the heat insulating device 11.

The following second to seventh embodiments mainly describe parts different from the first embodiment, and illustration and description of parts common to the first embodiment will be omitted.
[Second Embodiment]

The heat insulating device 11 for the cylinder bore wall of the second embodiment will be described with reference to FIGS. 9 and 10.

As shown in FIGS. 9 and 10, the covering member 26 is formed to have a substantially rectangular flat plate shape and to be curved along the cylinder bore wall 15. It is a member for directly contacting the cylinder bore wall 15 of the cylinder bore 13 to cover the heat insulating portion of the cylinder bore wall 15 and keeping the cylinder bore wall 15 of each cylinder bore 13 warm.

As shown in FIG. 10, the covering member 26 has a first notch 52 provided at a position corresponding to a corner of the square and a second notch 53 provided at a position between the second fixing portions 31B. Have. The first notch 52 is provided so as to remove the corner portion at a position separated from the plurality of fixed portions. The first notch 52 is located outside the second fixing 31B (on the end side with respect to the flow direction of the cooling water). The first notch 52 is provided corresponding to the bead 51, and the covering member 26 is provided so as to avoid the bead 51.

The second notch 53 is provided so as to be retracted toward the center of the covering member 26 from the portion corresponding to the second fixing 31B. However, the second notch 53 is not provided to avoid the bead 51. Therefore, the covering member 26 has a holding portion 54 that overlaps with the bead 51 at a position adjacent to the second notch portion 53. Therefore, at this position, the holding portion 54 constitutes the outer edge of the covering member 26. At this position, the covering member 26 is not arranged outside the holding portion 54. The holding portion 54 of the covering member 26 is sandwiched and held between the bead 51 and the back surface side pressing member 25.

The operation of the heat insulating device 11 on the cylinder bore wall of the present embodiment will be described. In the present embodiment, the first notch 52 is provided at the position of the corner where the influence of the flow velocity of the cooling water is large. Therefore, the covering member 26 is not arranged at this position, and the covering member 26 is prevented from being torn or damaged at this position. Further, a bead 51 is arranged outside the first notch 52 so as to protect the first notch 52. Therefore, it is further prevented that the covering member 26 is torn or damaged at this position. The holding portion 54 adjacent to the second notch portion 53 is sandwiched and held between the bead 51 and the back side pressing member 25. Therefore, at the position where the holding portion 54 is provided, the adhesion between the covering member 26 and the back side pressing member 25 can be improved. As a result, it is possible to prevent the cooling water from entering between the covering member 26 and the back surface pressing member 25 in the vicinity of the second notch 53. As a result, it is possible to prevent the covering member 26 from falling off from the heat insulating tool 11 on the cylinder bore wall.

According to the second embodiment, the following can be said. The covering member 26 has a first notch 52 provided so as to remove a corner portion at a position separated from the fixed portion. According to this configuration, since the cutout portion is provided at the position of the corner portion where tearing is likely to occur due to the influence of the flow of the cooling water, it is possible to prevent the covering member 26 from having a problem such as tearing.

The covering member 26 is provided with a second notch 53 provided at a position between the plurality of fixed portions, a bead 51 provided adjacent to the second notch 53, and the back surface side pressing member 25. It has a holding portion 54 that is sandwiched and held between the two. According to this configuration, the covering member 26 is not arranged on the outside of the holding portion 54. Therefore, it is possible to prevent the covering member 26 from being torn around the holding portion 54 due to the influence of the flow of the cooling water. Further, since the holding portion 54 is sandwiched and held between the bead 51 and the back side pressing member 25, the adhesion between the back side pressing member 25 and the covering member 26 is improved at this position. Therefore, it is possible to prevent the cooling water from entering between the back surface side pressing member 25 and the covering member 26. As a result, it is possible to prevent the covering member 26 from being lifted from the back surface pressing member 25, and to prevent the covering member 26 from falling off from the heat insulating device 11.
[Third Embodiment]

The heat insulating device 11 for the cylinder bore wall of the third embodiment will be described with reference to FIGS. 11 to 14.

As shown in FIGS. 11 to 13, the covering member 26 has a plurality of through holes 55 provided so as to correspond to the plurality of beads 51. The plurality of through holes 55 are formed in an elongated elongated hole shape along the pair of curved sides 42 of the front side backing plate 27. Therefore, in the present embodiment, the plurality of beads 51 are inserted inside the plurality of through holes 55. The plurality of through holes 55 provided in the covering member 26 can be formed by punching the covering member 26 in the thickness direction with, for example, an oval mold or the like.

As shown in FIG. 14, the height h of the bead 51 of the present embodiment is substantially the same as the thickness t of the covering member 26. In the present embodiment, as shown in FIGS. 13 and 14, the back side pressing member 25 may be omitted. In this case, the window portion 43A is not provided on the elastic member attachment member 24.

The operation of the heat insulating device 11 on the cylinder bore wall of the present embodiment will be described. In the present embodiment, the bead 51 is passed through the inside of the through hole 55. Therefore, as long as the covering member 26 is not torn, the covering member 26 will not fall off from the heat insulating tool 11. Therefore, in the present embodiment, the position of the covering member 26 is stable, and there is no problem that the covering member 26 moves with respect to the heat insulating device 11.

According to the third embodiment, the following can be said. The heat insulating device 11 on the cylinder bore wall is provided in the covering member 26 and has a plurality of through holes 55 through which the plurality of beads 51 are passed. According to this configuration, it is possible to prevent the covering member 26 from falling off from the heat insulating device 11 as much as possible.
[Fourth Embodiment]

The heat insulating device 11 for the cylinder bore wall of the fourth embodiment will be described with reference to FIGS. 15 and 16.

The fixing member 31 is provided corresponding to a plurality of first fixing portions 31A provided corresponding to the pair of non-curved sides 41 of the front side contact plate 27 and the pair of curved sides 42 of the front side contact plate 27. It also has a plurality of second fixing portions 31B. The plurality of first fixing portions 31A and the plurality of second fixing portions 31B are all provided on the outer peripheral portion (near the outer edge) of the heat insulating device 11.

The first fixing portion 31A is formed as a sheet metal extending in the vertical direction, and is continuously provided over the entire length of the heat insulating tool 11 in the vertical direction. One of the first fixing portions 31A is provided at the left end of the heat insulating device 11, and the other one of the first fixing portion 31A is provided at the right end of the heat insulating device.

The second fixing portion 31B is formed in a strip shape as a sheet metal extending in the lateral direction with a predetermined width. The plurality of second fixing portions 31B are provided at two positions above and below the position corresponding to the intermediate portion of the curved side 42 of the front side backing plate 27.

The first fixing portion 31A and the second fixing portion 31B are sheet metal formed so as to protrude from the elastic member attachment member 24, and are bent into a substantially U shape by being caulked (bent) by a press machine. There is. Therefore, the first fixing portion 31A and the second fixing portion 31B form a sandwiching portion, and the back side pressing member is formed between the first fixing portion 31A and the second fixing portion 31B and the elastic member attachment member 24. 25, the covering member 26, and the front side backing plate 27 are sandwiched and held. The first fixing portion 31A and the second fixing portion 31B fix the elastic member attachment member 24, the back side pressing member 25, the covering member 26, and the front side backing plate 27 to each other. The first fixing portion 31A and the second fixing portion 31B are not limited to the bending process of the sheet metal, and may be formed by, for example, screws, rivets, eyelets, welding, brazing, burring, or the like.

The horizontal frame portion 27B of the front side backing plate 27 has a plurality of beads 51. The plurality of beads 51 are provided on both sides of the second fixing portion 31B. Each bead 51 extends laterally along the curved side 42 of the front side backing plate 27. The bead 51 is provided so as to project toward the covering member 26 so as to be convex. The plurality of beads 51 are provided in series in the horizontal frame portion 27B.

The operation of the heat insulating device 11 on the cylinder bore wall of the present embodiment will be described. Since the beads 51 are provided on both sides of the second fixing portion 31B in between, it is possible to prevent the cooling water from entering between the back surface side pressing member 25 and the covering member 26 from this position. As a result, it is possible to prevent the covering member 26 from being lifted from the back surface pressing member 25 and causing a problem that the covering member 26 falls off. Further, in the present embodiment, the number of the second fixed portions 31B is reduced as compared with the first embodiment and the like. Therefore, the number of man-hours required for bending the second fixing portion 31B into a substantially U shape is reduced.

According to the fourth embodiment, the following can be said. The front side backing plate 27 has a pair of curved sides 42 and a pair of non-curved sides 41, and the plurality of fixing portions are provided at predetermined positions of the pair of curved sides 42, and the plurality of fixed portions are provided. Beads 51 are provided on both sides of the pair of curved sides 42 with the predetermined position in between.

According to this configuration, since the bead 51 is provided along the curved side 42, it is possible to prevent the cooling water from entering between the back surface side pressing member 25 and the covering member 26 from this position. As a result, it is possible to prevent the covering member 26 that has risen from the back surface pressing member 25 from falling off from the heat insulating device 11 on the cylinder bore wall. Further, by arranging the bead 51 instead of the fixed portion, the number of the fixed portions can be reduced. As a result, when assembling the heat insulating tool 11 on the cylinder bore wall, the man-hours required for fixing the fixing portion can be reduced, and the assembling work can be simplified.
[Fifth Embodiment]

The heat insulating device 11 for the cylinder bore wall of the fifth embodiment will be described with reference to FIGS. 17 and 18.

The fixing member 31 has a plurality of first fixing portions 31A provided corresponding to the pair of non-curved sides 41 of the front side backing plate 27. The fixing member 31 of the present embodiment does not include the second fixing portion 31B extending in the lateral direction. The plurality of first fixing portions 31A are provided on the outer peripheral portion (near the outer edge) of the heat insulating tool 11.

The first fixing portion 31A is formed as a sheet metal extending in the vertical direction, and is continuously provided over the entire length of the heat insulating tool 11 in the vertical direction. One of the first fixing portions 31A is provided at the left end portion of the heat insulating tool 11, and the other one of the first fixing portions is provided at the right end portion of the heat insulating tool 11.

The first fixing portion 31A is a sheet metal formed so as to protrude from the elastic member attachment member 24, and is bent into a substantially U shape by being caulked by a press machine. Therefore, the first fixing portion 31A forms a sandwiching portion, and between the first fixing portion 31A and the elastic member attachment member 24, the back side pressing member 25, the covering member 26, and the front side backing plate 27 Hold these by sandwiching them. The first fixing portion 31A fixes the elastic member attachment member 24, the back side pressing member 25, the covering member 26, and the front side backing plate 27 to each other. The first fixing portion 31A is not limited to the bending process of the sheet metal, and may be formed by, for example, screws, rivets, eyelets, welding, brazing, burring, or the like.

The horizontal frame portion 27B of the front side backing plate 27 has a plurality of beads 51. The plurality of beads 51 are provided over substantially the entire width of the front side backing plate 27 in the lateral direction (cooling water flow direction). Each bead 51 extends laterally along the curved side 42 of the front side backing plate 27. The bead 51 is provided so as to project toward the covering member 26 so as to be convex. The plurality of beads 51 are continuously provided in the horizontal frame portion 27B, but some of them may be discontinuous.

The operation of the heat insulating device 11 on the cylinder bore wall of the present embodiment will be described. Since the bead 51 is provided over substantially the entire width of the front side backing plate 27 in the lateral direction, it is possible to prevent cooling water from entering between the back side pressing member 25 and the covering member 26 from this position. .. As a result, it is possible to prevent the covering member 26 that has risen from the back surface pressing member 25 from falling off from the heat insulating device 11 on the cylinder bore wall. Further, in the present embodiment, the second fixing portion 31B is omitted. Therefore, the work required for bending the second fixing portion 31B into a substantially U shape is reduced.

According to the fifth embodiment, the following can be said. In the cylinder bore wall heat insulating tool 11, the front side backing plate 27 has a pair of curved sides 42 and a pair of non-curved sides 41, and the plurality of fixing portions are formed on the pair of non-curved sides 41. It is provided at a corresponding position and is not provided at a position corresponding to the pair of curved sides 42, and the plurality of beads 51 are provided along the pair of curved sides 42.

According to this configuration, since the bead 51 is provided along the curved side 42, it is possible to prevent the cooling water from entering between the back surface side pressing member 25 and the covering member 26 from this position. As a result, it is possible to prevent a problem that the covering member 26 that has risen from the back side pressing member 25 falls off. Further, by arranging the bead 51 instead of the fixed portion, the number of the fixed portions can be reduced. As a result, when assembling the heat insulating tool 11 on the cylinder bore wall, the man-hours required for fixing the fixing portion can be reduced, and the assembling work can be simplified.
[Sixth Embodiment]

The heat insulating device 11 for the cylinder bore wall of the sixth embodiment will be described with reference to FIGS. 19 and 20.

The fixing member 31 has a plurality of first fixing portions 31A provided corresponding to the pair of non-curved sides 41 of the front side backing plate 27. The fixing member 31 of the present embodiment does not include the second fixing portion 31B extending in the lateral direction. The plurality of first fixing portions 31A are all provided on the outer peripheral portion (near the outer edge) of the heat insulating device 11.

The first fixing portion 31A is formed as a sheet metal extending in the vertical direction. The first fixing portions 31A are provided in pairs at the left end of the heat insulating tool 11 and also in pairs at the right end of the heat insulating tool 11 (that is, the first fixing portions 31A are four of the heat insulating tools 11). It is provided at the corner of the place.) The pair of first fixing portions 31A provided at the left end portion are provided at both ends of the front side backing plate 27 in the vertical direction. A pair of first fixing portions 31A provided at the right end portion are provided at both ends in the vertical direction of the front side backing plate 27.

The first fixing portion 31A is a sheet metal formed so as to protrude from the elastic member attachment member 24, and is bent into a substantially U shape by being caulked by a press machine. Therefore, the first fixing portion 31A forms a sandwiching portion, and between the first fixing portion 31A and the elastic member attachment member 24, the back side pressing member 25, the covering member 26, and the front side backing plate 27 Hold these by sandwiching them. The first fixing portion 31A fixes the elastic member attachment member 24, the back side pressing member 25, the covering member 26, and the front side backing plate 27 to each other. The first fixing portion 31A is not limited to the bending process of the sheet metal, and may be formed by, for example, screws, rivets, eyelets, welding, brazing, burring, or the like.

The vertical frame portion 27A and the horizontal frame portion 27B of the front side backing plate 27 have a plurality of beads 51. Two of the plurality of beads 51 are provided along the curved side 42 of the front side backing plate 27 over substantially the entire width in the lateral direction (cooling water flow direction) of the front side backing plate 27. One of the bead 51s extending in the lateral direction is provided in the upper horizontal frame portion 27B, and the other one of the beads 51 extending in the lateral direction is provided in the lower horizontal frame portion 27B.

The other two of the plurality of beads 51 extend substantially the entire width of the front side backing plate 27 in the vertical direction (direction orthogonal to the flow of cooling water) along the non-curved side 41 of the front side backing plate 27. It is provided. One of the vertically extending beads 51 is provided in the left vertical frame portion 27A, and the other one of the vertically extending beads 51 is provided in the right vertical frame portion 27A. The bead 51 provided in the vertical frame portion 27A is provided between the first fixing portions 31A.

The bead 51 is provided so as to project toward the covering member 26 so as to be convex. The plurality of beads 51 are continuously provided in the horizontal frame portion 27B or the vertical frame portion 27A, but some of them may be discontinuous.

The operation of the heat insulating device 11 on the cylinder bore wall of the present embodiment will be described. Since the bead 51 is provided between the first fixing portions 31A, it is possible to prevent the cooling water from entering between the back surface side pressing member 25 and the covering member 26 from this position. Further, a pair of beads 51 extending in the lateral direction along the curved side 42 are provided. As a result, it is possible to prevent the cooling water from entering between the back surface side pressing member 25 and the covering member 26 at the position where the bead 51 is provided. As a result, it is possible to prevent the covering member 26 that has risen from the back surface pressing member 25 from falling off from the heat insulating device 11 on the cylinder bore wall. Further, in the present embodiment, the second fixing portion 31B is omitted. Therefore, the work required for bending the second fixing portion 31B into a substantially U shape is reduced.

According to the sixth embodiment, the following can be said. The front side backing plate 27 has a pair of curved sides 42 and a pair of non-curved sides 41, and the plurality of fixing portions are provided at a plurality of positions on the pair of non-curved sides 41. The bead 51 is provided between the plurality of fixed portions along the pair of non-curved sides 41.

According to this configuration, since the bead 51 is provided along the non-curved side 41, it is possible to prevent the cooling water from entering between the back surface side pressing member 25 and the covering member 26 from this position. As a result, it is possible to prevent the covering member 26 from being lifted from the back surface pressing member 25 and causing a problem that the covering member 26 falls off.
[7th Embodiment]

The heat insulating device 11 for the cylinder bore wall of the seventh embodiment will be described with reference to FIGS. 21 and 22.

As shown in FIGS. 21 and 22, the fixing member 31 is a pair of a plurality of first fixing portions 31A provided corresponding to the pair of non-curved sides 41 of the front side backing plate 27 and the front side backing plate 27. It has a plurality of second fixing portions 31B provided corresponding to the curved side 42 of the above. The plurality of first fixing portions 31A and the plurality of second fixing portions 31B are all provided on the outer peripheral portion (near the outer edge) of the heat insulating device 11.

The first fixing portion 31A is formed as a sheet metal extending in the vertical direction, and is continuously provided in the vertical direction of the heat insulating tool 11. The first fixing portion 31A is provided in a substantially intermediate portion in the vertical direction of the heat insulating tool 11. The first fixing portion 31A holds two-thirds or more of the length of the front side backing plate 27 in the vertical direction. One of the first fixing portions 31A is provided at the left end portion of the heat insulating tool 11, and the other one of the first fixing portion 31A is provided at the right end portion of the heat insulating tool 11.

The second fixing portion 31B is formed in a strip shape as a sheet metal extending in the lateral direction with a predetermined width. The plurality of second fixing portions 31B are discretely provided at predetermined positions on the curved side 42 of the front side backing plate 27.

The first fixing portion 31A and the second fixing portion 31B are sheet metal formed so as to protrude from the elastic member attachment member 24, and are bent into a substantially U shape by being caulked by a press machine. Therefore, the first fixing portion 31A and the second fixing portion 31B form a sandwiching portion, and the back side pressing member is formed between the first fixing portion 31A and the second fixing portion 31B and the elastic member attachment member 24. 25, the covering member 26, and the front side backing plate 27 are sandwiched and held. The first fixing portion 31A and the second fixing portion 31B fix the elastic member attachment member 24, the back side pressing member 25, the covering member 26, and the front side backing plate 27 to each other. The first fixing portion 31A is not limited to the bending process of the sheet metal, and may be formed by, for example, screws, rivets, eyelets, welding, brazing, burring, or the like.

As shown in FIG. 22, the back side pressing member 25 has a plurality of beads 51 at positions corresponding to the horizontal frame portion 27B of the front side backing plate 27. The plurality of beads 51 are provided on both sides of the second fixing portion 31B. Alternatively, it can be said that the plurality of beads 51 are provided between the second fixing portions 31B.

Each bead 51 extends laterally along the curved side 42 of the front side backing plate 27. As shown in FIGS. 23 and 24, the bead 51 is provided so as to project so as to be convex toward the front side backing plate 27. The plurality of beads 51 are provided in series at positions corresponding to the horizontal frame portion 27B.

The operation of the heat insulating device 11 on the cylinder bore wall of the present embodiment will be described. Since the bead 51 is provided between the second fixing portions 31B, it is possible to prevent the cooling water from entering between the back surface side pressing member 25 and the covering member 26 from this position. Therefore, it is possible to prevent the covering member 26 that has risen from the back surface pressing member 25 from falling off from the heat insulating device 11 on the cylinder bore wall.

According to the seventh embodiment, the following can be said. The heat insulating tool 11 on the cylinder bore wall comes into contact with the wall surface 22 on the cylinder bore 13 side of the groove-shaped cooling water flow path 14 through which the cooling water flows, and the covering member 26 for covering the wall surface 22 on the cylinder bore 13 side of the groove-shaped cooling water flow path 14. When viewed from above, it has an arc shape and is provided on the back surface side of the covering member 26, and the covering member 26 is directed from the back surface side toward the wall surface 22 on the cylinder bore 13 side of the groove-shaped cooling water flow path 14. The back side pressing member 25 for pressing and the contact surface side of the covering member 26 have an arc shape when viewed from above, and have a rectangular opening 46 when viewed from the front side. The front side backing plate 27 for sandwiching the outer edge portion of the covering member 26 between the back side pressing member 25 and the back side pressing member 25 having an arc shape when viewed from above. An elastic member attachment member 24 provided on the back surface side and having an elastic member 28 attached so that the back surface side pressing member 25 presses the covering member 26 toward the wall surface 22, and the elastic member attachment. A plurality of fixing portions for fixing the member 24, the back side pressing member 25, the covering member 26, and the front side backing plate 27, and the back side pressing member 25 at a position separated from the fixing portion. It has a plurality of beads 51 that are provided, project toward the covering member 26, and sandwich the covering member 26 with the front side backing plate 27.

According to this configuration, since the plurality of beads 51 are provided at positions separated from the fixed portion, the pressure for compressing the covering member 26 can be increased at the position of the beads 51. Therefore, the adhesion of the covering member 26 to the back surface pressing member 25 is improved at the position where the bead 51 is provided, and it is possible to prevent a gap from being formed between the back surface pressing member 25 and the covering member 26. Therefore, the cooling water in the groove-shaped cooling water flow path 14 is prevented from entering between the back surface side pressing member 25 and the covering member 26. As a result, it is possible to prevent the covering member 26 that has risen from the back side pressing member 25 from falling off from the heat insulating device 11. Further, since the holding force for holding the covering member 26 between the back side pressing member 25 and the front side backing plate 27 increases, the covering member 26 may be torn by the water flow of the cooling water, or the covering member 26 may be covered from the heat insulating tool 11. It is possible to prevent the member 26 from falling off. Further, by arranging a large number of beads 51 instead of the fixing portions, the total number of fixing portions can be reduced, and thereby the man-hours required for fixing the fixing portions at the time of assembling the heat insulating tool 11 can be reduced. Therefore, the efficiency of the assembling work of the heat insulating tool 11 can be improved.

The following eighth and ninth embodiments mainly describe parts different from the above seventh embodiment, and illustration and description of parts common to the seventh embodiment will be omitted.
[8th Embodiment]

The heat insulating device 11 for the cylinder bore wall of the eighth embodiment will be described with reference to FIG. 25.

The back side pressing member 25 has a plurality of beads 51 at positions corresponding to the horizontal frame portion 27B of the front side backing plate 27. The arrangement of the plurality of beads 51 is the same as that of FIG. 22 of the seventh embodiment. The plurality of beads 51 are provided on both sides of the second fixing portion 31B. Alternatively, it can be said that the plurality of beads 51 are provided between the second fixing portions 31B.

The covering member 26 has a plurality of through holes 55 provided so as to correspond to the plurality of beads 51. The plurality of through holes 55 are formed in an elongated elongated hole shape along the pair of curved sides 42 of the front side backing plate 27. Therefore, in the present embodiment, the plurality of beads 51 are inserted inside the plurality of through holes 55. The plurality of through holes 55 provided in the covering member 26 can be formed by punching the covering member 26 in the thickness direction with, for example, an oval mold.

As shown in FIG. 25, the height h of the bead 51 of the present embodiment is substantially the same as the thickness t of the covering member 26.

The operation of the heat insulating device 11 on the cylinder bore wall of the present embodiment will be described. In this embodiment, a plurality of beads 51 are passed through the inside of the plurality of through holes 55. Therefore, as long as the covering member is not torn, the covering member will not fall off from the heat insulating device. Therefore, in the present embodiment, the position of the covering member is stable, and there is no problem that the covering member 26 moves with respect to the back surface side pressing member 25.

According to the eighth embodiment, the following can be said. The heat insulating device 11 on the cylinder bore wall is provided in the covering member 26 and has a plurality of through holes 55 through which the plurality of beads 51 are passed. According to this configuration, it is possible to prevent as much as possible the risk of the covering member 26 falling off from between the back side pressing member 25 and the front side backing plate 27.
[9th Embodiment]

The heat insulating device 11 for the cylinder bore wall of the ninth embodiment will be described with reference to FIG. 26. In FIG. 26, the covering member 26 is not shown.

The fixing member 31 has a plurality of first fixing portions 31A provided corresponding to the pair of non-curved sides 41 of the front side backing plate 27. The fixing member 31 of the present embodiment does not include the second fixing portion 31B extending in the lateral direction. The plurality of first fixing portions 31A are provided on the outer peripheral portion (near the outer edge) of the heat insulating tool 11.

The first fixing portion 31A is formed as a sheet metal extending in the vertical direction, and is continuously provided over the entire length of the heat insulating tool 11 in the vertical direction. One of the first fixing portions 31A is provided at the left end portion of the heat insulating tool 11, and the other one of the first fixing portion 31A is provided at the right end portion of the heat insulating tool 11.

The first fixing portion 31A is a sheet metal formed so as to protrude from the elastic member attachment member 24, and is bent into a substantially U shape by being caulked by a press machine. Therefore, the first fixing portion 31A forms a sandwiching portion, and between the first fixing portion 31A and the elastic member attachment member 24, the back side pressing member 25, the covering member 26, and the front side backing plate 27 Hold these by sandwiching them. The first fixing portion 31A fixes the elastic member attachment member 24, the back side pressing member 25, the covering member 26, and the front side backing plate 27 to each other. The first fixing portion 31A is not limited to the bending process of the sheet metal, and may be formed by, for example, screws, rivets, eyelets, welding, brazing, burring, or the like.

The back side pressing member 25 has a plurality of beads 51 at positions corresponding to the horizontal frame portion 27B of the front side backing plate 27. The plurality of beads 51 are provided over substantially the entire width of the back surface side pressing member 25 in the lateral direction (cooling water flow direction). The bead 51 is provided so as to project toward the covering member 26 so as to be convex. The plurality of beads 51 are continuously provided in the horizontal frame portion 27B, but some of them may be discontinuous.

The operation of the heat insulating device 11 on the cylinder bore wall of the present embodiment will be described. In the present embodiment, since the bead 51 is provided over substantially the entire width of the back surface pressing member 25 in the lateral direction, cooling water enters between the back surface pressing member 25 and the covering member 26 from this position. Is prevented. As a result, it is possible to prevent the covering member 26 from being lifted from the back surface pressing member 25 and causing a problem that the covering member 26 falls off. Further, in the present embodiment, the second fixing portion 31B is omitted. Therefore, the work required for bending the second fixing portion 31B into a substantially U shape is reduced.

According to the ninth embodiment, the following can be said. In the cylinder bore wall heat insulating tool 11, the back surface pressing member 25 has a pair of curved sides 42 and a pair of non-curved sides 41, and the plurality of fixing portions are formed on the pair of non-curved sides 41. It is provided at a corresponding position and is not provided at a position corresponding to the pair of curved sides 42, and the plurality of beads 51 are provided along the pair of curved sides 42. According to this configuration, since the bead 51 is provided along the curved side 42, the pressure at which the covering member 26 is compressed at the position of the bead 51 is improved. Therefore, it is possible to prevent the cooling water from entering between the back surface side pressing member 25 and the covering member 26 from this position. As a result, it is possible to prevent the covering member 26 that has risen from the back surface pressing member 25 from falling off from the heat insulating device 11 on the cylinder bore wall. Further, by arranging the bead 51 instead of the fixed portion, the number of the fixed portions can be reduced. As a result, when assembling the heat insulating tool 11 on the cylinder bore wall, the man-hours required for fixing the fixing portion can be reduced, and the assembling work can be simplified.
[10th Embodiment]

The heat insulating device 11 for the cylinder bore wall of the tenth embodiment will be described with reference to FIG. 27. In FIG. 27, the covering member 26 is not shown.

The fixing member 31 has a plurality of first fixing portions 31A provided corresponding to the pair of non-curved sides 41 of the front side backing plate 27. The fixing member 31 of the present embodiment does not include the second fixing portion 31B extending in the lateral direction. The plurality of first fixing portions 31A are provided on the outer peripheral portion (near the outer edge) of the heat insulating tool 11.

The first fixing portion 31A is formed as a sheet metal extending in the vertical direction. The first fixing portions 31A are provided in pairs at the left end portion of the heat insulating tool 11, and are also provided in pairs at the right end portion of the heat insulating tool 11. The pair of first fixing portions 31A provided at the left end portion are provided at both ends of the front side backing plate 27 in the vertical direction. A pair of first fixing portions 31A provided at the right end portion are provided at both ends in the vertical direction of the front side backing plate 27.

The first fixing portion 31A is a sheet metal formed so as to protrude from the elastic member attachment member 24, and is bent into a substantially U shape by being caulked by a press machine. Therefore, the first fixing portion 31A forms a sandwiching portion, and between the first fixing portion 31A and the elastic member attachment member 24, the back side pressing member 25, the covering member 26, and the front side backing plate 27 Hold these by sandwiching them. The first fixing portion 31A fixes the elastic member attachment member 24, the back side pressing member 25, the covering member 26, and the front side backing plate 27 to each other. The first fixing portion 31A is not limited to the bending process of the sheet metal, and may be formed by, for example, screws, rivets, eyelets, welding, brazing, burring, or the like.

The back side pressing member 25 has a plurality of beads 51 at positions corresponding to the vertical frame portion 27A and the horizontal frame portion 27B of the front side backing plate 27. Two of the plurality of beads 51 are provided along the curved side 42 of the front side backing plate 27 over substantially the entire width of the back side pressing member 25 in the lateral direction (cooling water flow direction). One of the laterally extending beads 51 is provided so as to correspond to the upper horizontal frame portion 27B, and the other one of the laterally extending bead 51 corresponds to the lower horizontal frame portion 27B. Provided.

The other two of the plurality of beads 51 extend substantially the entire width of the back side pressing member 25 in the vertical direction (direction orthogonal to the flow of cooling water) along the non-curved side 41 of the front side backing plate 27. It is provided. One of the vertically extending beads 51 is provided so as to correspond to the left vertical frame portion 27A, and the other one of the vertically extending beads 51 is provided so as to correspond to the right vertical frame portion 27A. Be done. The bead 51 provided at a position corresponding to the vertical frame portion 27A is provided between the first fixed portions 31A.

The bead 51 is provided so as to project toward the covering member 26 so as to be convex. The plurality of beads 51 are continuously provided at positions corresponding to the horizontal frame portion 27B or the vertical frame portion 27A, but some of them may be discontinuous.

The operation of the heat insulating device 11 on the cylinder bore wall of the present embodiment will be described. Since the bead 51 is provided between the first fixing portions 31A, it is possible to prevent the cooling water from entering between the back surface side pressing member 25 and the covering member 26 from this position. Further, a pair of beads 51 extending in the lateral direction along the curved side 42 are provided. As a result, it is possible to prevent the cooling water from entering between the back surface side pressing member 25 and the covering member 26 at the position where the bead 51 is provided. Therefore, it is possible to prevent the covering member 26 that has risen from the back surface pressing member 25 from falling off from the heat insulating device 11 on the cylinder bore wall. Further, in the present embodiment, the second fixing portion 31B is omitted. Therefore, the work required for bending the second fixing portion 31B into a substantially U shape is reduced.

According to the tenth embodiment, the following can be said. In the cylinder bore wall heat insulating tool 11, the front side backing plate 27 has a pair of curved sides 42 and a pair of non-curved sides 41, and the plurality of fixing portions are on the pair of non-curved sides 41. The plurality of beads 51 are provided between the plurality of fixed portions along the pair of non-curved sides 41.

According to this configuration, since the bead 51 is provided along the non-curved side 41, it is possible to prevent the cooling water from entering between the back surface side pressing member 25 and the covering member 26 from this position. As a result, it is possible to prevent the covering member 26 from being lifted from the back surface pressing member 25 and causing a problem that the covering member 26 falls off.
[11th Embodiment]

The heat insulating device 11 for the cylinder bore wall of the eleventh embodiment will be described with reference to FIGS. 28 and 29.

The covering member 26 has a rectangular flat plate shape and is formed so as to be curved along the curved surface of the outer peripheral portion of the cylinder bore wall 15. The covering member 26 is preferably made of solid rubber. Solid rubber has almost no expandability. Therefore, the covering member 26 is formed in advance in a shape that protrudes from the opening 46 toward the cylinder bore wall 15. That is, the covering member 26 has a protruding portion protruding from the opening 46 toward the cylinder bore wall 15.

The present embodiment can also have substantially the same effects as those of the first embodiment.

The above-described embodiment can be implemented with various replacements and modifications. In addition, it is naturally possible to realize the invention by appropriately combining the above-described embodiments.

11 Cylinder bore wall heat insulator 12 Cylinder block 13 bore 13A End bore 13B Intermediate bore 14 Grooved cooling water flow path 15 Cylinder bore wall 15A 1st bore wall 15B 2nd bore wall 16 Cooling water supply port 17 Cooling water discharge port 18 Bore row 21 Inter-bore wall 22 Wall surface 23 Against wall 24 Elastic member Attached member 25 Back side pressing member 26 Covering member 27 Front side backing plate 27A Vertical frame part 27B Vertical frame part 28 Elastic member 28A Shaft part 28B Contact part 31 Fixing member 31A First Fixed part 31B Second fixed part 41 Non-curved side 42 Curved side 43 Frame part 44 Leg part 45 Stopper part 46 Opening 51 Bead 52 First notch 53 Second notch 54 Holding 55 Through hole

Claims (12)

A covering member for contacting the wall surface on the cylinder bore side of the groove-shaped cooling water flow path through which the cooling water flows and covering the wall surface on the cylinder bore side of the groove-shaped cooling water flow path.
A back surface pressing member provided on the back surface side of the covering member and for pressing the covering member from the back surface side toward the wall surface on the cylinder bore side of the groove-shaped cooling water flow path.
A front side backing plate provided on the contact surface side of the covering member, having an opening, and sandwiching the outer edge portion of the covering member between the back side pressing member and the back surface side pressing member.
An elastic member attachment member provided on the back side of the back surface pressing member and attached with an elastic member that urges the back surface pressing member to press the covering member toward the wall surface.
One or more fixing portions for fixing the elastic member attachment member, the back surface pressing member, the covering member, and the front surface backing plate.
One or more beads provided on the front side backing plate at a position separated from the one or more fixing portions, projecting toward the covering member, and sandwiching the covering member with the back side pressing member.
Cylinder bore wall insulation with. The front side backing plate has a pair of curved sides and a pair of non-curved sides.
The one or more fixing portions are provided at positions corresponding to the pair of non-curved sides, and are not provided at positions corresponding to the pair of curved sides.
The heat insulating device for a cylinder bore wall according to claim 1, wherein the one or more beads are provided along the pair of curved sides. The one or more beads are plural,
The front side backing plate has a pair of curved sides and a pair of non-curved sides.
The one or more fixing portions are provided at predetermined positions on the pair of curved sides.
The heat insulating device for a cylinder bore wall according to claim 1, wherein the plurality of beads are provided on both sides of the pair of curved sides with the predetermined position sandwiched between them. The heat insulating device for a cylinder bore wall according to claim 1, wherein the covering member has a first notch provided so as to remove a corner portion at a position separated from the one or more fixing portions. The one or more fixed portions are plural, and there are a plurality of fixed portions.
The covering member is sandwiched between a second notch provided at a position between the plurality of fixed portions and a bead provided adjacent to the second notch and the back surface side pressing member. The heat insulating device for a cylinder bore wall according to claim 1, further comprising a holding portion that is held. The one or more fixed portions are plural, and there are a plurality of fixed portions.
The front side backing plate has a pair of curved sides and a pair of non-curved sides.
The plurality of fixing portions are provided at a plurality of positions on the pair of non-curved sides.
The heat insulating device for a cylinder bore wall according to claim 1, wherein the one or more beads are provided between the plurality of fixed portions along the pair of non-curved sides. A covering member for contacting the wall surface on the cylinder bore side of the groove-shaped cooling water flow path through which the cooling water flows and covering the wall surface on the cylinder bore side of the groove-shaped cooling water flow path.
A back surface pressing member provided on the back surface side of the covering member and for pressing the covering member from the back surface side toward the wall surface on the cylinder bore side of the groove-shaped cooling water flow path.
A front side backing plate provided on the contact surface side of the covering member, having an opening, and sandwiching the outer edge portion of the covering member between the covering member and the back surface side pressing member.
An elastic member attachment member provided on the back side of the back surface pressing member and attached with an elastic member that urges the back surface pressing member to press the covering member toward the wall surface.
One or more fixing portions for fixing the elastic member attachment member, the back surface pressing member, the covering member, and the front surface backing plate.
One or more beads provided on the front side backing plate at a position separated from the one or more fixing portions and projecting toward the back side pressing member.
One or more through holes provided in the covering member through which the one or more beads pass, and
Cylinder bore wall insulation with. A covering member for contacting the wall surface on the cylinder bore side of the groove-shaped cooling water flow path through which the cooling water flows and covering the wall surface on the cylinder bore side of the groove-shaped cooling water flow path.
A back surface pressing member provided on the back surface side of the covering member and for pressing the covering member from the back surface side toward the wall surface on the cylinder bore side of the groove-shaped cooling water flow path.
A front side backing plate provided on the contact surface side of the covering member, having an opening, and sandwiching the outer edge portion of the covering member between the covering member and the back surface side pressing member.
An elastic member attachment member provided on the back side of the back surface pressing member and attached with an elastic member that urges the back surface pressing member to press the covering member toward the wall surface.
One or more fixing portions for fixing the elastic member attachment member, the back surface pressing member, the covering member, and the front surface backing plate.
One or more beads provided on the back side pressing member at a position separated from the one or more fixing portions, projecting toward the covering member, and sandwiching the covering member with the front side backing plate.
Cylinder bore wall insulation with. The back side pressing member has a pair of curved sides and a pair of non-curved sides.
The one or more fixing portions are provided at positions corresponding to the pair of non-curved sides, and are not provided at positions corresponding to the pair of curved sides.
The heat insulating device for a cylinder bore wall according to claim 8, wherein the one or more beads are provided along the pair of curved sides. The one or more beads are plural,
The back side pressing member has a pair of curved sides and a pair of non-curved sides.
The one or more fixing portions are provided at predetermined positions on the pair of curved sides.
The heat insulating device for a cylinder bore wall according to claim 8, wherein the plurality of beads are provided on both sides of the pair of curved sides with the predetermined position interposed therebetween. The one or more fixed portions are plural, and there are a plurality of fixed portions.
The front side backing plate has a pair of curved sides and a pair of non-curved sides.
The plurality of fixing portions are provided at a plurality of positions on the pair of non-curved sides.
The heat insulating device for a cylinder bore wall according to claim 8, wherein the one or more beads are provided between the plurality of fixed portions along the pair of non-curved sides. A covering member for contacting the wall surface on the cylinder bore side of the groove-shaped cooling water flow path through which the cooling water flows and covering the wall surface on the cylinder bore side of the groove-shaped cooling water flow path.
A back surface pressing member provided on the back surface side of the covering member and for pressing the covering member from the back surface side toward the wall surface on the cylinder bore side of the groove-shaped cooling water flow path.
A front side backing plate provided on the contact surface side of the covering member, having an opening, and sandwiching the outer edge portion of the covering member between the covering member and the back surface side pressing member.
An elastic member attachment member provided on the back side of the back surface pressing member and attached with an elastic member that urges the back surface pressing member to press the covering member toward the wall surface.
One or more fixing portions for fixing the elastic member attachment member, the back surface pressing member, the covering member, and the front surface backing plate.
One or more beads that are provided on the back side pressing member at a position separated from the one or more fixing portions and project toward the front side backing plate side.
One or more through holes provided in the covering member through which the one or more beads pass, and
Cylinder bore wall insulation with.

Images