Water jacket intermediate piece

Abstract

Water jacket intermediate piece (11) which adjusts a flow rate of cooling water in a water jacket (5), wherein the water jacket intermediate piece (11) is inserted into the water jacket (5) of a cylinder block (1) and the water jacket intermediate piece (11) comprises: an intermediate body (12); and a correction device (13) which inhibits the flow of cooling water to an inner wall (5c) on a cylinder bore side of the water jacket (5), characterized by that the correction device (13) has a front wall portion (13a), a bottom wall portion (13b), a left side wall portion (13c) and a right side wall portion (13d) and is formed like a box whose upper end is open and is provided on a surface (12a) of the intermediate piece body (12), the surface (12a) is located on a side of a cooling water inlet opening (6) of the water jacket (5), and the correction device (13) is provided deeper than the cooling water inlet opening (6) in the depth direction (a).

Description

[0001] The invention relates to a water jacket intermediate piece to be inserted into a water jacket of a cylinder block of an internal combustion engine.

[0002] A water jacket is formed around a cylinder bore of a cylinder block of an internal combustion engine, particularly a water-cooled engine; and cooling water, including cooling water mixed with antifreeze, flows in the water jacket to cool a cylinder bore wall, the temperature of which increases during engine operation. A water jacket spacer is inserted in the water jacket and appropriately cools the cylinder bore wall by adjusting the flow rate of cooling water; see JP 2005-256661 A and JP 2007-263120 A. Thus, appropriate cooling of the cylinder bore wall is achieved by the water jacket spacer. However, around a cooling water inlet port in the water jacket, a lower portion of the cylinder bore wall is sometimes excessively cooled by the cooling water flowing to the rear side (on the cylinder bore side) of the water jacket spacer.If the lower portion of the cylinder bore wall opposite the cooling water inlet port is excessively cooled, the viscosity of engine oil increases, or the sliding resistance of a piston ring and cylinder liner increases due to deformation of the cylinder bore, reducing energy efficiency. JP 2005-256661 A and JP 2007-263120 A propose a structure to prevent excessive cooling of the cylinder bore wall around the cooling water inlet port (the area opposite the cooling water inlet port).

[0003] JP 2005-256661 A discloses, as a structure for preventing this excessive cooling, a sealing structure for preventing water flow between the cylinder bore wall and the water jacket spacer, a structure in which the cylinder bore wall and the water jacket spacer are directly and firmly attached, a structure in which the water jacket spacer is excited or pressed against the cylinder bore wall, and a structure in which the thermal conductivity of the cylinder bore wall around the cooling water inlet port is reduced. JP 2007-263120 A discloses a structure in which an extension portion is provided perpendicularly along the cylinder bore wall around the cooling water inlet port of the water jacket spacer, and a portion bent from the extension portion is provided, which inhibits the flow of cooling water into the cylinder bore wall.

[0004] In the seal structure, fixed structure, and excitation or pressure buildup disclosed in JP 2005-256661 A, the structure sometimes becomes unstable due to vibration and deterioration over time, and the above-mentioned effect of preventing excessive cooling is not maintained over time. If the thermal conductivity of the cylinder bore wall around the cooling water inlet port is reduced, the thermal conductivity of the cylinder block must be reduced. Such a process may be impractical. In the case of JP 2007-263120 A, which restricts the flow of cooling water, the extended portion and the tip may not sufficiently fulfill the function of restricting the flow of cooling water.

[0005] DE 601 26 532 T2 discloses a structure for cooling a cylinder block. The structure includes a water jacket extending around a wall of a cylinder bore to convey a coolant, and a mechanism that determines a cooling characteristic of the water jacket.

[0006] The invention was conceived in light of the above-mentioned problems, and its object is to provide a water jacket spacer that can effectively prevent excessive cooling of the cylinder bore wall around the cooling water inlet port with a simple structure. In this specification, "cooling water inlet port" refers to the opening of the cooling water inlet, i.e., the "cooling water inlet port."

[0007] In a water jacket spacer adjusting a flow rate of cooling water in a water jacket of the embodiment of the invention, the water jacket spacer being inserted into the water jacket of a cylinder block, the water jacket spacer comprises: a spacer body and a corrector that inhibits the flow of cooling water into an inner wall on a cylinder bore side of the water jacket, the corrector having a pocket shape and being provided on a surface of the spacer body, the surface being on a side of a cooling water inlet port of the water jacket, and the corrector being provided deeper than the cooling water inlet port in the depth direction.

[0008] In the embodiment, cooling water introduced from the cooling water inlet port impacts a surface on the cooling water inlet port side of the spacer body. After that, a portion of the cooling water enters the pocket-shaped correction device, flows out of it, and circulates to spread upward along the spacer body in the depth direction of the water jacket. Therefore, the amount of cooling water flowing to the cylinder bore wall from a lower edge of the spacer body is reduced, and excessive cooling is effectively prevented at the lower portion of the cylinder bore wall facing the cooling water inlet port.

[0009] The correction device has a front wall section, a bottom wall section, a right side wall section and a left side wall section.

[0010] In the embodiment, the water flow direction of cooling water flowing downward in the depth direction of the water jacket is changed by the front wall, the bottom wall and the right or left side wall, which effectively inhibits the cooling water flow to the cylinder bore wall side from the lower edge of the spacer body.

[0011] In the above-mentioned water jacket intermediate piece, the correction device can be provided in the vicinity of the cooling water inlet connection.

[0012] In the embodiment, cooling water entering the water jacket from the cooling water inlet port is prevented from flowing downward in the depth direction around the spacer body, and the amount of cooling water flowing to the cylinder bore wall from the lower edge of the spacer body decreases. Therefore, excessive cooling at the lower portion of the cylinder bore wall facing the cooling water inlet port is effectively prevented.

[0013] In the above-mentioned water jacket intermediate piece, a width of the correction device perpendicular to a depth direction of the water jacket and along a surface on the cooling water inlet port side of the intermediate piece body may be larger than that of the cooling water inlet port.

[0014] In the embodiment, the amount of cooling water entering from the cooling water inlet port and flowing downward in the depth direction of the water jacket whose flow path is changed by the correcting device increases, which effectively prevents the cooling water flow to the cylinder bore wall and excessive cooling at the lower portion of the cylinder bore wall.

[0015] In the above-mentioned water jacket intermediate piece, the correction device is configured so that part of the correction device is located in the cooling water inlet connection.

[0016] In the embodiment, before cooling water entering from the cooling water inlet port and flowing downward in the depth direction of the water jacket is distributed in the water jacket, the amount of cooling water whose flow path is changed upward by the correcting device increases, which effectively prevents the cooling water from flowing to the cylinder bore wall and excessive cooling at the lower portion of the cylinder bore wall.

[0017] In the above-mentioned water jacket intermediate piece, the intermediate piece body can be configured to completely cover the water jacket in the depth direction.

[0018] In the embodiment, the water jacket spacer is stably held at a predetermined position in the depth direction of the water jacket. Furthermore, the amount of cooling water flowing to the cylinder bore wall of the spacer body from the lower edge of the spacer body is reduced.

[0019] In the water jacket intermediate piece of the invention, excessive cooling on the cylinder bore wall around the cooling water inlet port can be effectively prevented by a simple structure.

[0020] The embodiment of the invention is explained below with reference to the accompanying drawings. Fig. 1 is a plan view schematically illustrating an embodiment of a cylinder block for an automotive engine to which a water jacket spacer of one aspect of the invention is applied. Fig. 2 is a Fig. 1 and shows another water jacket intermediate piece of another aspect of the invention. Fig. Figure 3 shows the first embodiment of the water jacket intermediate piece of one aspect of the invention and is an enlarged sectional view in the direction of the arrow on the line AA of Fig. 1 and the arrow on the line A'-A' of Fig. 2. Fig. 4a is a partial view in the direction of the arrow on the line BB of Fig. 3, and Fig. 4b is a partial view of the water jacket intermediate piece at line C of Fig. 4a. Fig. 5a is a Fig. 4a and shows a modification of the above embodiment. Fig. 5b is a partial view in the direction of arrow DD of Fig. 5a. Fig. 6 is a partial view of the water jacket intermediate piece at line E of Fig. 5a. Fig. 7 is a Fig. 4a and shows a further modification of the above-mentioned embodiment. Fig. 8a is a partial view of the water jacket intermediate piece at line F of Fig. 7. Fig. 8b shows a modification of Fig. 8a. Fig. 9a and Fig. 9b show a further example which is common to the modifications of the above-mentioned embodiment, and are Fig. Views similar to 5b. Fig. 10a is a Fig. 4a and shows the second embodiment of the water jacket adapter of one aspect of the invention. Fig. 10b is a partial view in the direction of arrow GG of Fig. 10a. Fig. 11a is a Fig. 4a and shows a modification of the above embodiment in Fig. 10. Fig. 11b is a partial view in the direction of arrow HH of Fig. 11a. Fig. 11c is a partial view of the water jacket intermediate piece at line J of Fig. 11a. Fig. 12 shows a further modification of Fig. 11. Fig. 12a is a Fig. 11a similar view, Fig. 12b is a partial view in the direction of arrow KK of Fig. 12a, and Fig. 12c is a partial view of the water jacket intermediate piece at line L of Fig. 12a.

[0021] Fig. 1 is a plan view schematically illustrating an embodiment of a cylinder block for an automotive engine to which a water jacket spacer of one aspect of the invention is applied. Fig. Figure 2 shows a water jacket intermediate piece of another aspect of the invention. The water jacket intermediate piece in Fig. 1 is a partial intermediate piece partially inserted into a water jacket and positioned to face a cooling water inlet connection. The water jacket intermediate piece in Fig. 2 is formed around the entire shape of the annular water jacket and inserted into the entire water jacket. Fig. Figure 3 shows the first embodiment of the water jacket intermediate piece of one aspect of the invention and is an enlarged sectional view in the direction of the arrow on the line AA of Fig. 1 and the arrow on the line A'-A' of Fig. 2. The embodiment of Fig. 3 is explained as an embodiment which corresponds to the water jacket intermediate pieces according to Fig. 1 and Fig. 2 is common.

[0022] A cylinder block 1 according to Fig. 1, Fig. 2 and Fig. 3 forms a three-cylinder automotive engine 100 (internal combustion engine), and three cylinder bores 2 are arranged in series. Reference numerals 1a... denote holes for inserting bolts (not shown in the drawing) for integrally fastening a cylinder head (not shown in the drawing) to the cylinder block 1. A cylinder liner 3 is integrally fitted on the inside of the cylinder bore 2, and a piston 4 is housed in the cylinder liner 3 so that it reciprocates slidably in the axial direction (direction indicated by an arrow "a"). A plurality of piston rings 41... contacting the inside of the cylinder liner 3 are fitted on the circumference of the piston 4 so that the piston 4 slides smoothly inside the cylinder liner 3 together with the piston rings 41 via engine oil (not shown in the drawing). An open-deck water jacket 5 is provided around three cylinder bores 2...continuously, and the cylinder block 1 is provided with a cooling water inlet port 6 (cooling water with antifreeze liquid) and a cooling water outlet port 7 communicating with the water jacket 5. The cooling water outlet port 7 is connected to a radiator not shown in the drawing with a pipe, and the outlet side of the radiator is connected to the cooling water inlet port 6 via a water pump (not shown in the drawing) with a pipe. Thus, the cooling water circulates between the water jacket 5 and the radiator. A sleeve 9 for connecting a piping 8 for circulation is attached to the cooling water inlet port 6 via a flange portion 9a with bolts not shown in the drawing. A similar sleeve not shown in the drawing is provided for the cooling water outlet port 7.When a water jacket is provided for a cylinder head, the water jacket 5 of the cylinder block 1 is designed to communicate with the water jacket of the cylinder head. In such a case, the cooling water outlet port 7, which is unnecessary for the cylinder block 1, is provided for the cylinder head and connected to the radiator via a pipe. In the following explanation, "upper" etc. refers to the front-facing blade side of . Fig. 1 or Fig. 2, ie on the open side of the water jacket. "Lower" etc. refers to the back of the sheet of Fig. 1 or Fig. 2, ie the underside on the opposite side to the opening of the water jacket. In Fig. 3, "upper" etc. denotes the upper side on the drawing sheet along the arrow "a," and "lower" etc. denotes the lower side on the drawing sheet along the arrow "a." The arrow "a" corresponds to the depth direction of the water jacket 5 and is referred to as "depth direction a."

[0023] The water jacket 5 has an open-deck design with an open top end and is formed with a bottom portion 5a, an outer wall 5b, and an inner wall 5c (cylinder bore wall) on the cylinder bore 2 side. The opening portion 5d at the top end is sealed by a cylinder head gasket 10 provided between the cylinder block 1 and the cylinder head (not shown in the drawing). A water jacket spacer 11 is inserted into the water jacket 5 from the opening portion 5d at the top end. The water jacket spacer 11 according to Fig. 1 is a non-annular partial intermediate piece which is inserted at a position opposite to the cooling water inlet connection 6 in the water jacket 5. The water jacket intermediate piece 11 according to Fig. 2 is an annular spacer around the shape of the water jacket 5. In the drawings, the water jacket spacer 11 includes a spacer body 12 formed with a molded resin body, and a corrector 13 in the form of a pocket provided on the outer surface 12a of the spacer body 12 facing the cooling water inlet port 6 of the water jacket 5, near and below the lower portion of the cooling water inlet port 6. The spacer body 12 and the corrector 13 are integrally molded with the same resin. In the illustration, the spacer body 12 is provided to extend entirely in the depth direction "a" from the opening portion 5d at the upper end to the bottom portion 5a of the water jacket 5. However, the upper end of the spacer body 12 must be positioned above the upper edge of the cooling water inlet port 6.

[0024] The water jacket intermediate piece 11 of the embodiment is also shown in Fig. 4a and Fig. 4b. The water jacket intermediate piece 11 according to Fig. 4a and Fig. 4b is a partial intermediate piece; however, the following explanation also applies to the annular intermediate piece according to Fig. 2. The pocket-shaped correction device 13 constituting the water jacket intermediate piece 11 is positioned in the vicinity of the lower end of the cooling water inlet port 6, has a front wall 13a, a bottom wall 13b, a left side wall 13c, and a right side wall 13d, and is shaped like a box with an open top. The length "d" of the correction device 13, which is perpendicular to the depth direction "a" of the water jacket 5 and extends around a surface 12a (hereinafter referred to as the outer surface) on the cooling water inlet port 6 side of the intermediate piece body 12, is greater than the corresponding length d1 of the cooling water inlet port 6. The upper opening of the correction device 13 is formed larger than the bottom wall 13b so as to widen in the width direction. A double-dotted line in Fig. 4b shows the shape of the open edge portion on the water jacket 5 side of the cooling water inlet port 6. The bottom wall 13b of the correction device 13 extends from the outer surface 12a so as to be perpendicular to the outer surface 12a and in the depth direction "a." The side walls 13c, 13d are substantially perpendicular to the outer surface 12a and extend upward from the left and right ends of the bottom wall 13b, respectively. The front wall 13a is connected to the bottom wall 13b and the side walls 13c, 13d and positioned to face the outer surface 12a. The side walls 13c, 13d incline to reduce the width facing the bottom wall 13b. It is desirable that the upper edges of the front wall 13a and the side walls 13c, 13d are positioned near and below the bottom of the open edge portion on the water jacket 5 side of the cooling water inlet port 6.However, the upper edges may be in the same position as the bottom or protrude slightly upward. In the drawing, the front wall 13a is perpendicular to the bottom wall 13b; but the front wall 13a may be inclined so that it widens the upper end portion of the correction device 13.

[0025] In the cylinder block 1, into which the above-mentioned water jacket spacer 11 is inserted, cooling water is introduced into the water jacket 5 from a circulation pipe 8 via the sleeve 9 and the cooling water inlet port 6 as indicated by arrow "b". The cooling water introduced into the water jacket 5 strikes the outer surface 12a of the spacer body 12 and spreads in the water jacket 5 around the outer surface 12a. The cooling water distributed in the water jacket 5 prevents a temperature rise of the cylinder bore wall 5c. The cooling water flowing sideways and upward in the depth direction "a" flows into the rear of the spacer body 12 and cools the cylinder bore wall 5c on the combustion chamber side.A portion of the cooling water impacts the outer surface 12a of the spacer body 12 and also flows into the pocket-like space of the correction device 13, then flows out of the water correction device 13, disperses, and circulates upward in the depth direction "a" in the water jacket 5 around the spacer body 12 according to arrow b1. Therefore, the amount of cooling water flowing to the cylinder bore wall 5c from a lower edge 12b of the spacer body 12 decreases, effectively preventing excessive cooling of the lower portion of the cylinder bore wall 5c facing the cooling water inlet port 6.

[0026] In this embodiment, the length "d" in the width direction of the correction device 13 is greater than the length d1 in the width direction of the cooling water inlet port 6. Therefore, most of the cooling water flowing downward from the cooling water inlet port 6 flows to the correction device 13 and circulates in the direction of arrow b1 as shown, which effectively inhibits the flow of cooling water to the above-mentioned cylinder bore wall 5c. The amount of cooling water flowing downward in the depth direction "a" of the water jacket 5, whose flow path is changed by the correction device 13, increases. The cooling water disperses, circulates in the water jacket 5, and is discharged from the outlet port 7 to the radiator. While the cooling water circulates in the water jacket 5, the cylinder bore wall 5c, which needs to be cooled, is heated at the upper portion of the cylinder block 1 (on a side near the cylinder head, ie,on the combustion chamber side) is properly cooled, which prevents excessive cooling of the lower portion of the cylinder bore wall 5c. Therefore, the cylinder liner 3 is not deformed, and the piston 4 moves up and down smoothly. The spacer body 12 is formed to extend over the entire depth direction "a" of the water jacket 5, so that the water jacket spacer 11 is stably held at a predetermined position in the depth direction "a" of the water jacket 5. In addition, the amount of cooling water flowing to the cylinder bore wall 5c of the spacer body 12 from the lower edge 12b of the spacer body 12 is reduced.

[0027] Fig. 5a, Fig. 5b and Fig. 6 show a modification of the above-mentioned embodiment. The common components with the embodiments according to Fig. 3 and Fig. 4 have the same reference numbers, and some components are not explained below.

[0028] In the modification according to Fig. 5a, Fig. 5b and Fig. 6, the pocket-like correction device 13 has the front wall 13a, the bottom wall 13b, and the side walls 13c, 13d and is formed like a box whose upper end is open according to the above-mentioned embodiment. However, the front wall 13a, the bottom wall 13b, and the side walls 13c, 13d are curved planes, which differ from the embodiment according to Fig. 3 and Fig. 4. Also in this modification, as mentioned in the above embodiment, the correcting device 13 functions such that most of the water flowing downward from the cooling water inlet port 6 flows into the correcting device 13 and circulates in the direction of arrow b1 as shown, which effectively reduces the amount of cooling water flowing to the cylinder bore wall 5c from the lower edge 12b of the spacer body 12. In addition, since the front wall 13a, the bottom wall 13b, and the side walls 13c, 13d are curved, the cooling water entering the correcting device 13 and whose flow direction is changed circulates smoothly.

[0029] Fig. 7, Fig. 8a and Fig. 8b show a further (not claimed) modification of the above embodiment. In this modification, the cooling water circulation pipe 8 is provided along the outer surface of the cylinder block 1 and is connected to the cooling water inlet port 6 via the sleeve (not shown). Fig. 7, Fig. 8a and Fig. 8b, see Fig. 1 to Fig. 3). The flow center of the cooling water inlet port 6 is inclined relative to the cylinder block 1 in plan view. That is, the flow direction of the cooling water is inclined along the flow center of the cooling water inlet port 6, which is shown in the direction of arrow "b". The pocket-type correction device 13 has the front wall 13a, the bottom wall 13b, and the right side wall 13d; but the left wall 13c, see Fig. 3 and Fig. 4, is not provided. In the modification of Fig. 8b, the correction device 13 is formed such that the cooling water inlet port 6 is positioned near and above a cutout portion 13aa formed on the upper surface of the front wall 13a. In the modification, a portion of the obliquely introduced cooling water flows into the correction device 13; but most of the cooling water entering the correction device 13 flows out of the correction device 13 along the front wall 13a, the bottom wall 13b, and the right wall 13d, disperses, and circulates upward around the spacer body 12 in the depth direction "a" in the water jacket 5, as shown by arrow b1. The amount of cooling water flowing to the cylinder bore wall 5c from the lower edge 12b of the spacer body 12 decreases, effectively preventing excessive cooling of the lower portion of the cylinder bore wall 5c facing the cooling water inlet port 6.Since the cooling water is introduced obliquely in such a case, the same cooling water correction function as mentioned above is achieved even if the left side wall 13c is not provided. If the right and left side walls 13c, 13d are arranged according to . Fig. 3 and Fig. 4, a further correction function is fulfilled. The left wall 13c is not provided in the drawings, however, the right wall 13d may not be provided, depending on the direction of the flow center of the cooling water inlet port 6.

[0030] Fig. 9a and Fig. 9b show another example as in the first embodiment. In this example, the cooling water inlet port 6 is formed with a cutout cavity 6a formed at the upper end of the engine block 1 and at the cylinder head gasket 10. The pocket-like correction device 13 forming the water jacket spacer 11 is arranged near and below the cooling water inlet port 6 as described in the embodiments according to Fig. 3 and Fig. 4 is provided.

[0031] The correction device 13 has the front wall 13a, the bottom wall 13b, and the right and left side walls 13c, 13d, and is formed like a box with an open top. The left side wall 13c is not shown in the drawing. The left side wall 13c is not necessary if the cooling water inlet port 6 is formed obliquely in plan view, which is the case in the embodiment of Fig. 7 is shown.

[0032] In the example of Fig. 9a, the intermediate body 12 is designed such that it extends substantially in the depth direction “a” of the entire water jacket 5 from the opening section 5d at the upper end to the bottom section 5a, see Fig. 3. In the example of Fig. 9b, the spacer body 12 is designed to be positioned only at the upper portion in the water jacket 5. In the examples, the cooling water introduced into the water jacket 5 from the cooling water inlet port 6 impacts the outer surface 12a of the spacer body 12, disperses in the water jacket 5 around the outer surface 12a, and flows into the rear of the spacer body 12 from the upper edge 12c of the spacer body 12 according to the arrow "b." This effectively cools the cylinder bore wall 5c on the combustion chamber side. Part of the cooling water impacts the outer surface 12a of the spacer body 12 and also flows into the pocket-like space of the correction device 13. After that, the cooling water flows out of the correction device 13, disperses, and circulates upward in the depth direction "a" in the water jacket 5 around the spacer body 12.This reduces the amount of cooling water flowing downward in the water jacket 5 and effectively prevents excessive cooling of the lower portion of the cylinder bore wall 5c facing the cooling water inlet port 6.

[0033] In the examples, the correction device 13 can be Fig. 5 to Fig. 8 shown correction device 13 may be replaced.

[0034] Fig. 10 shows the second embodiment of the water jacket intermediate piece of the invention. Fig. 11 shows a modification of the embodiment, and Fig. 12 shows a modification of the embodiment in Fig. 11. In the embodiments and modifications, a part of the correction device 13 is located so as to be embedded in a part of the cooling water inlet port 6.

[0035] In the variation of Fig. 10a and Fig. 10b, stepped cutout concavities 6b, 6c are formed at the upper end portion of the cylinder block 1. The cutout concavities 6b, 6c and the cylinder head gasket 10 constitute the cooling water inlet port 6. The cutout concavity 6c is positioned on the water jacket 5 side and is lower than the cutout concavity 6b. In this embodiment, the water jacket spacer 11 includes the spacer body 12 formed with a resin molding and the pocket-like corrector 13 integrated into the spacer body 12 as mentioned above. The corrector 13 is provided on the side of the outer surface 12a of the spacer body 12 facing the cooling water inlet port 6 of the water jacket 5, near and below the cooling water inlet port 6 (in the lower half of the cooling water inlet port 6).The correction device 13 has the front wall 13a, the bottom wall 13b, and the side walls 13c, 13d, and is shaped like a box with an open upper end. A part of the front end of the correction device 13 is designed to be embedded in the cooling water inlet port 6, that is, in the cutout cavity 6c forming the cooling water inlet port 6.

[0036] In the cylinder block 1, into which the above-mentioned water jacket spacer 11 is inserted, cooling water is introduced into the water jacket 5 from the cooling water inlet port 6 as indicated by arrow "b." The cooling water introduced into the water jacket 5 impacts the outer surface 12a of the spacer body 12, disperses in the water jacket 5 around the outer surface 12a, and flows into the rear of the spacer body 12 from the upper edge 12c of the spacer body 12. This effectively cools the cylinder bore wall 5c on the combustion chamber side. A portion of the cooling water impacts the outer surface 12a of the spacer body 12 and also flows into the pocket-like space of the correction device 13, as indicated by arrow b1. After that, the cooling water flows out of the correction device 13, disperses, and circulates upward in the depth direction "a" in the water jacket around the spacer body 12.A part of the correction device 13 is formed to be embedded in the cooling water inlet port 6, so that the pocket-like space is formed wide and the amount of cooling water flowing into the correction device 13 increases. In addition, the cooling water flows into the correction device 13 before flowing into the water jacket 5, thereby realizing the correction function even more effectively.

[0037] Since other structures are the same as in the above embodiment, the common components have the same reference numerals and their explanation is omitted here.

[0038] In the example according to Fig. 11a, Fig. 11b and Fig. 11c, the cooling water circulation pipe 8 is provided along the outer surface of the cylinder block 1, and a part of the cylinder block 1 where the cooling water inlet port 6 is provided is designed to expand outward. The cooling water inlet port 6 is formed with the cutout cavity 6d formed at the upper end portion of the cylinder block 1 and the cylinder head gasket 10. The circulation pipe 8 is connected to the cooling water inlet port 6 via the sleeve 9 (not shown). Fig. 11 shown, see Fig. 1 to Fig. 3). The cutout cavity 6d forming the cooling water inlet port 6 is provided in the shape of a step lower than the circulation pipe 8 where the cutout cavity 6d and the circulation pipe 8 are connected. In this example, the water jacket interface 11 includes the interface body 12 formed with the resin molded body and the pocket-like correction device 13 integrated into the interface body 12 as mentioned above. The correction device 13 is provided on the side of the outer surface 12a of the interface body 12 facing the cooling water inlet port 6 of the water jacket 5, near and below the cooling water inlet port 6 (in the lower half of the cooling water inlet port 6). The correction device 13 has the front wall 13a, the bottom wall 13b and the right and left side walls 13c, 13d and is formed like a box whose upper end is open.A part of the front end of the correction device 13 is designed to be embedded in the cooling water inlet port 6, that is, in the cutout cavity 6d.

[0039] In the cylinder block 1, into which the above-mentioned water jacket spacer 11 is inserted, cooling water is introduced into the water jacket 5 from the cooling water inlet port 6 as indicated by arrow "b." The cooling water introduced into the water jacket 5 impacts the outer surface 12a of the spacer body 12, disperses in the water jacket 5 around the outer surface 12a, and flows into the rear of the spacer body 12 from the upper edge 12c of the spacer body 12. This effectively cools the cylinder bore wall 5c on the combustion chamber side. Part of the cooling water flows into the pocket-like space of the correction device 13, as indicated by arrow b1. After that, the cooling water flows out of the correction device 13, disperses, and circulates upward in the depth direction "a" in the water jacket 5 around the spacer body 12.A part of the correction device 13 is formed to be embedded in the cooling water inlet port 6, so that the pocket-like space is formed wide and the amount of cooling water flowing into the correction device 13 increases. In addition, the cooling water flows into the correction device 13 before flowing into the water jacket 5, thereby realizing the correction function more effectively, which is shown in the example of FIG. Fig. 10 was mentioned.

[0040] The example according to Fig. 12a, Fig. 12b and Fig. 12c is a (not claimed) modification of the embodiment of Fig. 11. The left side wall 13c forming the correction device 13 is not provided, and other structures are similar to those of Fig. 11, see Fig. 11. Since the left side wall 13c is not provided in this modification, the cooling water flowing from the circulation pipe 8 flows smoothly into the correction device 13, whereby the above-mentioned function of the correction device 13 is effectively achieved.

[0041] Since other structures are the same as in the embodiment of Fig. 11, the common components have the same reference numbers and their explanation is omitted here. The section 13aa according to Fig. 8b can be used for the front wall 13a of the correction device 13 in the modifications according to Fig. 11 and Fig. 12 should be provided.

[0042] The three-cylinder automotive engine 100 serves as an example of an internal combustion engine to which the water jacket intermediate piece of the invention is applied. However, the water jacket intermediate piece may be applied to any automotive engine other than the three-cylinder automotive engine or an internal combustion engine not used for a motor vehicle. The position of the cooling water inlet port 6 of the cylinder block 1 is not limited to the embodiment in Fig.1 and can be located at any location in the circumferential direction of the water jacket 5. The position in the height (depth) direction of the cooling water inlet port 6 is not limited to the bottom or top as in the drawings, and may be in the middle, depending on the specification of the engine. The cylinder bore wall 5c at the lower portion of the water jacket 5 in the depth direction "a" is easily overcooled, or the water jacket 5 from the middle portion to the lower portion is overcooled, depending on the specification of the engine. Therefore, the corrector 13 is appropriately positioned depending on the specification of the engine. The sectional shape of the cooling water inlet port 6 is square in the drawings; however, the invention is not limited to such an embodiment, and the sectional shape may be circular, rectangular, or other shapes.

[0043] In the above-mentioned embodiment, the correction device 13 is formed with a resin molded body integrated with the intermediate body 12; however, the material is not limited to resin, and it may be made of metal and integrated with the intermediate body 12. The shape of the correction device 13 is not limited to those shown in the drawings, and it may have other shapes as long as it is shaped like a pocket. List of reference symbols 1 cylinder block 2 cylinder bore 5 Water jacket 5c Cylinder bore wall (inner wall on cylinder bore side) 6 Cooling water inlet connection 11 Water jacket intermediate piece 12 intermediate body 13 Correction device 13a front wall 13b floor wall 13c left side wall 13d right side wall a depth direction d Length in width direction of the correction device d1 Length in width direction of the cooling water inlet connection

Claims

[1] Water jacket intermediate piece (11) which adjusts a flow rate of cooling water in a water jacket (5), wherein the water jacket intermediate piece (11) is inserted into the water jacket (5) of a cylinder block (1) and the water jacket intermediate piece (11) comprises: an intermediate body (12); and a correction device (13) which inhibits the flow of cooling water to an inner wall (5c) on a cylinder bore side of the water jacket (5), characterized by , that the correction device (13) has a front wall section (13a), a bottom wall section (13b), a left side wall section (13c) and a right side wall section (13d) and is formed like a box whose upper end is open and is provided on a surface (12a) of the intermediate piece body (12), the surface (12a) lies on one side of a cooling water inlet opening (6) of the water jacket (5) and the correction device (13) is provided deeper than the cooling water inlet opening (6) in the depth direction (a). [2] Water jacket intermediate piece (11) according to claim 1, wherein the correction device (13) is provided in the vicinity of the cooling water inlet opening (6). [3] The water jacket intermediate piece (11) according to any one of claims 1 to 2, wherein a width (d) of the correction means (13) perpendicular to a depth direction (a) of the water jacket (5) and along a surface on the cooling water inlet opening side of the intermediate piece body (13) is larger than that of the cooling water inlet opening (6). [4] Water jacket intermediate piece (11) according to one of claims 1 to 3, wherein the correction device (13) is configured such that a part of the correction device (13) is located in the cooling water inlet opening (6). [5] Water jacket intermediate piece (11) according to one of claims 1 to 4, wherein the intermediate piece body (12) is configured to cover the water jacket (5) entirely in the depth direction (a). [6] Cylinder block (1) with a water jacket intermediate piece (11) according to one of claims 1 to 5, wherein the water jacket (5) has an open-deck structure with an open top and is formed with the inner wall (5c) on the cylinder bore side, a bottom portion (5a) and an outer wall (5b).

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