Internal combustion engine

Abstract

To increase rigidity of a first oil pan.SOLUTION: An internal combustion engine 10 includes a cylinder block 11, a cooling water pump 21, an oil cooler 23, an oil pan 15, and a cooling water flow passage 25. The cooling water flow passage 25 is a flow passage penetrating through inside of the oil pan 15 to supply cooling water to the oil cooler 23. The oil pan 15 includes: an annular first oil pan 16 mounted to the cylinder block 11; and a second oil pan 17 mounted to the first oil pan 16. The cooling water flow passage 25 includes cooling water piping 26 located on the second oil pan 17 side from a center in a vertical direction X in the first oil pan 16. The cooling water piping 26 extends in a reference direction Y intersecting with the vertical direction X. Both of a first end part and a second end part of the cooling water piping 26 are fixed to a side wall of the first oil pan 16.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an internal combustion engine. [Background technology]

[0002] As disclosed in Patent Document 1, an oil pan for storing oil is provided at the bottom of an internal combustion engine. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-265861 Summary of the Invention [Problem to be solved by the invention]

[0004] In order to increase the amount of oil circulating in the internal combustion engine, it is necessary to increase the volume of the oil pan. Increasing the oil pan's capacity increases the opening of the oil pan, which results in a decrease in the rigidity of the oil pan. [Means for solving the problem]

[0005] An internal combustion engine that solves the above problems includes a cylinder block, a cooling water pump attached to the cylinder block and discharging cooling water, an oil cooler installed on the opposite side of the cylinder block from the cooling water pump and cooling oil using the cooling water discharged from the cooling water pump, an oil pan located between the cooling water pump and the oil cooler and attached to the lower part of the cylinder block, and a cooling water flow path that supplies the cooling water discharged from the cooling water pump to the oil cooler and is configured to penetrate the oil pan. The oil pan includes an annular first oil pan attached to the cylinder block and a second oil pan located on the opposite side of the cylinder block from the first oil pan and attached to the first oil pan. The direction in which the oil pan and the cylinder block are aligned is defined as the vertical direction. In this case, the cooling water flow path includes a cooling water piping located in the first oil pan closer to the second oil pan than the center in the vertical direction. The cooling water pipe extends in a predetermined direction intersecting the up-down direction, and both a first end and a second end of the cooling water pipe are fixed to a side wall of the first oil pan. [Effects of the Invention]

[0006] The internal combustion engine has an advantage that the rigidity of the first oil pan can be increased. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a schematic diagram showing an outline of an internal combustion engine according to an embodiment. [Figure 2] FIG. 2 is a schematic diagram showing an outline of the internal structure of the oil pan provided in the internal combustion engine of FIG. [Figure 3] FIG. 3 is a schematic diagram showing an outline of the internal structure of the oil pan provided in the internal combustion engine of FIG. [Figure 4] FIG. 4 is a schematic diagram showing an outline of the internal structure of an oil pan provided in an internal combustion engine of a modified example. [Figure 5]FIG. 5 is a schematic diagram showing an outline of the internal structure of an oil pan provided in an internal combustion engine of a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment of an internal combustion engine will be described below with reference to FIGS. <Overall configuration of an internal combustion engine> As shown in FIG. 1, an internal combustion engine 10 includes a cylinder block 11, a cylinder head 13, and an oil pan 15. A plurality of cylinders 111 are formed in the cylinder block 11. Pistons are housed in the plurality of cylinders 111. The direction in which the plurality of cylinders 111 are lined up is referred to as the "cylinder arrangement direction." The direction in which the pistons reciprocate within the cylinders 111 is referred to as the "vertical direction X." The vertical direction X is substantially perpendicular to the cylinder arrangement direction. Within the vertical direction X, the direction in which the pistons move as they approach the cylinder head 13 is referred to as the "upper direction X1," and the direction opposite to the upper direction X1 is referred to as the "lower direction X2."

[0009] The cylinder head 13 is attached to the upper part of the cylinder block 11. The oil pan 15 is attached to the lower part of the cylinder block 11. That is, the cylinder head 13, the cylinder block 11, and the oil pan 15 are aligned in the vertical direction X.

[0010] 1 and 2, oil circulating inside the internal combustion engine 10 is stored inside the oil pan 15. The oil pan 15 has an annular first oil pan 16 attached to the cylinder block 11 and a second oil pan 17 attached to the lower part of the first oil pan 16. The opening of the first oil pan 16 facing upward in the X1 direction is closed by the cylinder block 11. The second oil pan 17 is attached to the first oil pan 16 so as to close the opening of the first oil pan 16 facing downward in the X2 direction. The second oil pan 17 has a cylindrical portion 171 and a bottom wall 172 that closes the opening of the cylindrical portion 171 facing downward in the X2 direction.

[0011] A crankshaft 19, which is the output shaft of the internal combustion engine 10, is provided inside the first oil pan 16. For example, the crankshaft 19 is disposed in the first oil pan 16 in the direction X1 above the middle position in the vertical direction X. In other words, the first oil pan 16 also functions as a crankcase.

[0012] The internal combustion engine 10 further includes a cooling water pump 21, an oil cooler 23, and a cooling water flow path 25. The cooling water pump 21 discharges cooling water circulating within the internal combustion engine 10. The cooling water pump 21 is attached to the cylinder block 11. A direction substantially perpendicular to the cylinder arrangement direction and the up-down direction X is referred to as the "reference direction Y." In this case, the cooling water pump 21 is attached to one side of the cylinder block 11 in the reference direction Y.

[0013] The oil cooler 23 is installed on the opposite side of the cylinder block 11 from the cooling water pump 21. In other words, the oil pan 15 is located between the oil cooler 23 and the cooling water pump 21. The oil cooler 23 uses the cooling water discharged from the cooling water pump 21 to cool the oil.

[0014] The cooling water flow path 25 is a flow path that supplies the cooling water discharged from the cooling water pump 21 to the oil cooler 23. The cooling water flow path 25 is configured to penetrate through the oil pan 15. Specifically, as shown in FIG. 2, the cooling water flow path 25 includes a cooling water pipe 26 that is located inside the first oil pan 16, closer to the second oil pan 17 than the center in the up-down direction X. A two-dot chain line FG in FIG. 2 is an imaginary line that indicates the center of the first oil pan 16 in the up-down direction X. The cooling water pipe 26 extends in a specified direction that intersects with the up-down direction X. In the example shown in FIGS. 1 and 2, the specified direction coincides with a reference direction Y.

[0015] One of the two ends of the cooling water pipe 26 is a first end 261 and the other is a second end 262. Both the first end 261 and the second end 262 are fixed to the side wall 161 of the first oil pan 16. For example, the cooling water pipe 26 is formed integrally with the first oil pan 16.

[0016] 3 is a schematic diagram showing the cross-sectional shape of the oil pan 15 when the oil pan 15 is cut along an imaginary plane PH that is perpendicular to the cylinder arrangement direction. Oil flows into the oil pan 15 along at least one flow path. The cooling water pipe 26 is set to a certain flow path 100. Therefore, the oil flowing along the flow path 100 comes into contact with the cooling water pipe 26.

[0017] <Actions and Effects of This Embodiment> (1) In the internal combustion engine 10, the cooling water flow path 25 penetrates through the first oil pan 16 in the reference direction Y. The cooling water pipe 26 that constitutes the cooling water flow path 25 extends in the reference direction Y, and the cooling water pipe 26 is disposed in the first oil pan 16. Both the first end 261 and the second end 262 of the cooling water pipe 26 are fixed to the side wall 161 of the first oil pan 16. This increases the rigidity of the first oil pan 16.

[0018] Specifically, the upper part of the first oil pan 16 is attached to the cylinder block 11. The cylinder block 11 is a highly rigid component. Therefore, by attaching the upper part of the first oil pan 16 to the cylinder block 11, the rigidity of the upper part of the first oil pan 16 can be ensured.

[0019] On the other hand, the lower part of the first oil pan 16 is attached to the second oil pan 17, which has lower rigidity than the cylinder block 11. Therefore, the rigidity of the lower part of the first oil pan 16 tends to be lower than the rigidity of the upper part of the first oil pan 16.

[0020] In this regard, in the internal combustion engine 10, the cooling water pipe 26 is located inside the first oil pan 16 closer to the second oil pan 17 than the center in the up-down direction X. Therefore, by arranging the cooling water pipe 26 in such a position, the rigidity of the lower part of the first oil pan 16 is increased.

[0021] Therefore, the internal combustion engine 10 can increase the rigidity of the first oil pan 16. (2) The cooling water pipe 26 is installed in the flow path 100 of the oil flowing into the oil pan 15. As a result, the cooling water pipe 26 can lower the temperature of the oil flowing into the oil pan 15.

[0022] <Example of change> The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other within the scope of technical compatibility.

[0023] The cooling water pipe 26 may be installed in a position where it comes into contact with the oil stored in the oil pan 15. In the example shown in Fig. 4, the cooling water pipe 26 is installed in the direction X2 below the oil level 200. This allows the oil in the oil pan 15 to be cooled by the cooling water flowing through the cooling water pipe 26.

[0024] 5, the cooling water pipe 26 may be installed in a central region of the first oil pan 16 in the cylinder arrangement direction Z. For example, when the first oil pan 16 is divided into three equal sections in the cylinder arrangement direction, the central section may be defined as the central region. In the example shown in FIG. 5, the cylinder arrangement direction Z corresponds to the width direction that is perpendicular to both the up-down direction X and the reference direction Y. This increases the rigidity of the first oil pan 16.

[0025] The cooling water pipe 26 does not have to be located in the flow path 100 as long as it is located closer to the second oil pan 17 than the center of the first oil pan 16 in the vertical direction X.

[0026] The expression "at least one" used herein means "one or more" of the desired options. As an example, the expression "at least one" used herein means "only one option" or "both of two options" if the number of options is two. As another example, the expression "at least one" used herein means "only one option" or "any combination of two or more options" if the number of options is three or more. [Explanation of symbols]

[0027] 10...internal combustion engine, 11...cylinder block, 15...oil pan, 16...first oil pan, 161...side wall, 17...second oil pan, 21...cooling water pump, 23...oil cooler, 25...cooling water flow path, 26...cooling water piping, 261...first end, 262...second end, 100...flow path.

Claims

1. A cylinder block, a cooling water pump attached to the cylinder block and discharging cooling water; an oil cooler that is installed on the opposite side of the cylinder block from the cooling water pump and that cools oil using cooling water discharged from the cooling water pump; an oil pan located between the cooling water pump and the oil cooler and attached to a lower part of the cylinder block; a cooling water flow path that supplies cooling water discharged from the cooling water pump to the oil cooler, the cooling water flow path being configured to pass through the oil pan, the oil pan includes an annular first oil pan attached to the cylinder block, and a second oil pan located on the opposite side of the cylinder block with the first oil pan in between and attached to the first oil pan; When the direction in which the oil pan and the cylinder block are aligned is defined as the up-down direction, the cooling water flow path includes a cooling water pipe located in the first oil pan closer to the second oil pan than a center in the up-down direction, The cooling water pipe extends in a predetermined direction intersecting the up-down direction, and both a first end and a second end of the cooling water pipe are fixed to a side wall of the first oil pan. Internal combustion engine.

2. The cooling water pipe is installed in a flow path of oil flowing into the oil pan.

2. The internal combustion engine according to claim 1.

3. The cooling water pipe is installed in a position where it comes into contact with the oil stored in the oil pan.

2. The internal combustion engine according to claim 1.

4. When a direction perpendicular to both the vertical direction and the specified direction is defined as a width direction, The cooling water pipe is installed in a central region of the first oil pan in the width direction.

2. The internal combustion engine according to claim 1.

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