Internal combustion engine

Abstract

To reduce vibration generated in an internal combustion engine.SOLUTION: An internal combustion engine side mount bracket 6 is fixed to an internal combustion engine body 8, while upper edges on an upward side in a vertical direction along a cylinder axial line L1 of the internal combustion engine body 8 are first stop points S1a, S1b, S1c, and lower edges on a downward side in the vertical direction of the internal combustion engine body 8 are second stop points S2a, S2b, S2c. A center position G of an insulator 15 mounted on a vehicle body side mount bracket 7 is positioned on the lower side in the vertical direction of the internal combustion engine body 8 than the first stop points S1a, S1b, S1c.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an internal combustion engine mounted on a vehicle. [Background technology]

[0002] For example, Patent Document 1 discloses an internal combustion engine in which a mount portion for mounting to the body of a vehicle is integrally formed with a resin front cover arranged to cover one end side of a cylinder block and a cylinder head. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2020 / 183687 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the internal combustion engine disclosed in Patent Document 1, no consideration is given to reducing vibrations generated in the internal combustion engine.

[0005] That is, the internal combustion engine of Patent Document 1 has room for further improvement in terms of reducing vibrations generated in the internal combustion engine. [Means for solving the problem]

[0006] The internal combustion engine of the present invention has a mount bracket that supports an internal combustion engine body on a vehicle body and has an anti-vibration insulator attached to it. The mount bracket has an upper edge portion on an upper side in the vertical direction of the internal combustion engine body fixed to the internal combustion engine body at a first fastening point and a lower edge portion on a lower side in the vertical direction of the internal combustion engine body fixed to the internal combustion engine body at a second fastening point. The center position of the insulator is located lower than the first fastening point in the vertical direction of the internal combustion engine body. Effect of the Invention

[0007] According to the present invention, by lowering the center position G of the insulator, the insulator approaches the node position of the torsional vibration mode of the power plant including the internal combustion engine, thereby suppressing vibration input to the vehicle. [Brief description of the drawings]

[0008] [Figure 1] 1 is an explanatory diagram that illustrates a schematic configuration of an internal combustion engine to which the present invention is applied; [Diagram 2] 1 is a front view of the inside of an internal combustion engine to which the present invention is applied; [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. 4 is a perspective view of the internal combustion engine side mount bracket alone. [Figure 6] FIG. 4 is a perspective view showing a state in which the internal combustion engine side mount bracket and the vehicle body side mount bracket are connected to each other. [Figure 7] FIG. 2 is an explanatory diagram illustrating an example of a torsional vibration mode occurring in a power plant. [Figure 8] FIG. 2 is an explanatory diagram illustrating an example of a collapse vibration mode that occurs in a power plant. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] An embodiment of the present invention will be described in detail below with reference to the drawings. In each drawing, the X-axis indicates an axis along the front-rear direction of the internal combustion engine 1 (an axis parallel to the central axis of the crankshaft 9 of the internal combustion engine 1), the Y-axis indicates an axis along the left-right direction (width direction of the internal combustion engine) of the internal combustion engine 1, and the Z-axis indicates an axis along the up-down direction of the internal combustion engine 1 (an axis parallel to the cylinder axis L1 of the internal combustion engine 1). In other words, the X-axis is an axis along the cylinder row direction of the internal combustion engine 1 or the internal combustion engine body 8 (described later). The Y-axis is an axis along the width direction of the internal combustion engine 1 or the internal combustion engine body 8. The Z-axis is an axis parallel to the cylinder axis L1 of the internal combustion engine body 8 (see FIG. 2).

[0010] FIG. 1 is an explanatory diagram that shows a schematic configuration of an internal combustion engine 1 to which the present invention is applied.

[0011] The internal combustion engine 1 is, for example, an in-line multi-cylinder internal combustion engine, and includes a cylinder head 2, a cylinder block 3 attached to the lower part of the cylinder head 2, a cam bracket 4 attached to the upper part of the cylinder head 2, a front cover 5 covering the front of an internal combustion engine body 8, and an internal combustion engine side mount bracket 6 located in front of the front cover 5. Reference numeral 7 in FIG. 1 denotes a vehicle body side mount bracket fixed to the vehicle body side of the vehicle on which the internal combustion engine 1 is mounted. The cylinder head 2, the cylinder block 3, and the cam bracket 4 constitute the internal combustion engine body 8. Therefore, the front cover 5 covers an end face 8a on one end side of the internal combustion engine body 8 in the cylinder row direction. The internal combustion engine side mount bracket 6 and the vehicle body side mount bracket 7 are metal mount brackets for mounting the internal combustion engine body 8 to the vehicle. The vehicle body side mount bracket 7, which is a mount bracket on the vehicle body side, supports the internal combustion engine body 8 on the vehicle body via the internal combustion engine side mount bracket 6, which is a mount bracket on the internal combustion engine body 8 side. That is, the internal combustion engine body 8 has a mount bracket that supports the engine on the vehicle body, the mount bracket including an internal combustion engine side mount bracket 6 and a vehicle body side mount bracket .

[0012] The cylinder head 2 is a casting made of a metal material such as an aluminum alloy, and is formed with an intake port (not shown) for supplying intake air to a combustion chamber (not shown), and an exhaust port (not shown) for discharging exhaust gas from the combustion chamber (not shown).

[0013] The cylinder block 3 is a casting made of a metal material such as an aluminum alloy, and has cylinders (not shown) formed therein, the number of which corresponds to the number of cylinders.

[0014] The cam bracket 4 is made of a metal material such as an aluminum alloy, and supports a camshaft (not shown) together with the cylinder head 2 so that the camshaft can rotate.

[0015] The front cover 5 is made of a synthetic resin material such as polyamide, and is attached liquid-tight to the internal combustion engine body 8 so as to cover the front surface of the internal combustion engine body 8. More specifically, the front cover 5 is attached to the front surface of the cylinder block 3, the front surface of the cylinder head 2, the front surface of the cam bracket 4, etc. with bolts (not shown). In other words, the front cover 5 is attached to the internal combustion engine body 8 so as to cover the end faces on one end side of the cylinder block 3 and the cylinder head 2 in the crankshaft axial direction, i.e., the end face 8a on one end side of the internal combustion engine body 8 in the cylinder row direction.

[0016] Furthermore, the front cover 5 accommodates a crank sprocket (not shown) fixed to the front end of the crankshaft 9 (see FIG. 2) and a cam sprocket (not shown) fixed to the front end of the camshaft (not shown) in the space formed between the front cover 5 and the front surface of the internal combustion engine body 8. A timing chain (not shown) for transmitting rotational power is wound around the crank sprocket and the cam sprocket.

[0017] The internal combustion engine side mount bracket 6 corresponds to the first mount bracket, and is attached to an end face 8a on one end side in the cylinder row direction of the internal combustion engine 1. The internal combustion engine side mount bracket 6 is a casting made of a metal material such as an aluminum alloy. The internal combustion engine side mount bracket 6 overlaps with the front cover 5 so as to cover a part of the outer surface of the front cover 5.

[0018] As shown in Figures 2 and 3, the internal combustion engine side mount bracket 6 has six bolt through holes 11, namely a first bolt through hole 11a to a sixth bolt through hole 11f. Figure 2 is a front view of the internal combustion engine 1 to which the internal combustion engine side mount bracket 6 and the vehicle body side mount bracket 7 are attached. Figure 3 is a front view of the internal combustion engine side mount bracket 6 alone. Reference numeral 10 in Figure 2 denotes an oil pan attached to the lower part of the cylinder block 3.

[0019] The first bolt through hole 11a is formed to penetrate a first bolt boss portion 12a formed at an upper portion of one end side (left side in FIG. 2) of the internal combustion engine side mount bracket 6 in the internal combustion engine width direction. The first bolt boss portion 12a is pressed against the cylinder head 2 constituting the end face 8a of one end side of the internal combustion engine body 8 on the back side of the internal combustion engine side mount bracket 6. A bolt penetrating the first bolt through hole 11a fixes the first bolt boss portion 12a to the cylinder head 2 on the outside of the front cover 5. In other words, the center position of the bolt penetrating the first bolt through hole 11a becomes a first fastening point S1a which is one of the first fastening points S1 for fixing the upper edge portion of the internal combustion engine side mount bracket 6 on the upper side in the up-down direction of the internal combustion engine body 8 to the internal combustion engine body 8.

[0020] The second bolt through hole 11b is formed to penetrate a second bolt boss portion 12b formed at the upper portion of the internal combustion engine side mount bracket 6 at approximately the center in the internal combustion engine width direction. The second bolt boss portion 12b is pressed against the cylinder head 2 constituting the end face 8a on one end side of the internal combustion engine body 8 on the back side of the internal combustion engine side mount bracket 6. A bolt penetrating the second bolt through hole 11b penetrates the front cover 5 and fixes the second bolt boss portion 12b to the cylinder head 2. In other words, the center position of the bolt penetrating the second bolt through hole 11b becomes a first fastening point S1b, which is one of the first fastening points S1 that fixes the upper edge portion of the internal combustion engine side mount bracket 6 on the upper side in the vertical direction of the internal combustion engine body 8 to the internal combustion engine body 8.

[0021] The third bolt through hole 11c is formed to penetrate a third bolt boss portion 12c formed on the upper portion of the other end side (left side in FIG. 2) of the internal combustion engine side mount bracket 6 in the internal combustion engine width direction. The third bolt boss portion 12c is pressed against the cylinder head 2 constituting the end face 8a on one end side of the internal combustion engine body 8 on the back side of the internal combustion engine side mount bracket 6. A bolt penetrating the third bolt through hole 11c fixes the third bolt boss portion 12c to the cylinder head 2 on the outside of the front cover 5. In other words, the center position of the bolt penetrating the third bolt through hole 11c becomes a first fastening point S1c which is one of the first fastening points S1 for fixing the upper edge portion of the internal combustion engine side mount bracket 6 on the upper side in the up-down direction of the internal combustion engine body 8 to the internal combustion engine body 8.

[0022] The fourth bolt through hole 11d is formed to penetrate a fourth bolt boss portion 12d formed at the lower portion of one end side of the internal combustion engine side mount bracket 6 in the internal combustion engine width direction. The fourth bolt boss portion 12d is pressed against the cylinder block 3 constituting the end face 8a of one end side of the internal combustion engine body 8 on the back side of the internal combustion engine side mount bracket 6. A bolt penetrating the fourth bolt through hole 11d fixes the fourth bolt boss portion 12d to the cylinder block 3 on the outside of the front cover 5. In other words, the center position of the bolt penetrating the fourth bolt through hole 11d becomes a second fastening point S2a which is one of the second fastening points S2 that fixes the lower edge portion of the internal combustion engine side mount bracket 6 on the lower side in the up-down direction of the internal combustion engine body 8 to the internal combustion engine body 8.

[0023] The fifth bolt through hole 11e is formed to penetrate a fifth bolt boss portion 12e formed at the lower portion of the internal combustion engine side mount bracket 6 at approximately the center in the internal combustion engine width direction. The fifth bolt boss portion 12e is pressed against the cylinder block 3 constituting the end face 8a on one end side of the internal combustion engine body 8 on the back side of the internal combustion engine side mount bracket 6. A bolt penetrating the fifth bolt through hole 11e penetrates the front cover 5 and fixes the fifth bolt boss portion 12e to the cylinder block 3. In other words, the center position of the bolt penetrating the fifth bolt through hole 11e becomes a second fastening point S2b, which is one of the second fastening points S2 that fixes the lower edge portion of the internal combustion engine side mount bracket 6 on the lower side in the up-down direction of the internal combustion engine body 8 to the internal combustion engine body 8.

[0024] The sixth bolt through hole 11f is formed to penetrate a sixth bolt boss portion 12f formed at the lower portion of the other end side of the internal combustion engine side mount bracket 6 in the internal combustion engine width direction. The sixth bolt boss portion 12f is pressed against the cylinder block 3 constituting the end face 8a on one end side of the internal combustion engine body 8 on the back side of the internal combustion engine side mount bracket 6. A bolt penetrating the sixth bolt through hole 11f fixes the sixth bolt boss portion 12f to the cylinder block 3 on the outside of the front cover 5. In other words, the center position of the bolt penetrating the sixth bolt through hole 11f becomes a second fastening point S2c, which is one of the second fastening points S2 that fixes the lower edge portion of the internal combustion engine side mount bracket 6 on the lower side in the up-down direction of the internal combustion engine body 8 to the internal combustion engine body 8.

[0025] The internal combustion engine side mount bracket 6 has an upper edge portion on the upper side in the vertical direction along the cylinder axis L1 of the internal combustion engine body 8 fixed to the internal combustion engine body 8 at first fastening points S1a, S1b, and S1c. Also, the internal combustion engine side mount bracket 6 has a lower edge portion on the lower side in the vertical direction along the cylinder axis L1 of the internal combustion engine body 8 fixed to the internal combustion engine body 8 at second fastening points S2a, S2b, and S2c.

[0026] In this embodiment, among the multiple first fastening points S1, the first fastening point S1a is located at the lowermost position in the vertical direction of the internal combustion engine body 8. Also, in this embodiment, among the multiple second fastening points S2, the second fastening point S2b is located at the uppermost position in the vertical direction of the internal combustion engine body 8.

[0027] The internal combustion engine side mount bracket 6 is formed so that its dimension in the vertical direction along the cylinder axis L 1 of the internal combustion engine body 8 spans the cylinder head 2 and the cylinder block 3 .

[0028] Furthermore, the internal combustion engine side mount bracket 6 has fixing surfaces 13 in three locations, as shown in Figures 3 to 6. These fixing surfaces 13 have internal combustion engine side bolt insertion holes 14 into which bolts (not shown) are inserted that connect the internal combustion engine side mount bracket 6 and the vehicle body side mount bracket 7, as shown in Figures 4 and 5. The fixing surfaces 13 of the internal combustion engine side mount bracket 6 are a first fixing surface 13a, a second fixing surface 13b, and a third fixing surface 13c.

[0029] Fig. 4 is a plan view of the internal combustion engine side mount bracket 6. Fig. 5 is a perspective view of the internal combustion engine side mount bracket 6 alone. Fig. 6 is a perspective view showing the internal combustion engine side mount bracket 6 and the vehicle body side mount bracket 7 connected together.

[0030] The first fixing surface 13a, the second fixing surface 13b, and the third fixing surface 13c are flat surfaces for fixing the vehicle body side mount bracket 7, and are formed on the internal combustion engine side mount bracket 6 so as to be perpendicular to the Z axis described above and point upward in the vertical direction of the internal combustion engine 1. The first fixing surface 13a to the third fixing surface 13c are formed on the upper end of the upper edge of the internal combustion engine side mount bracket 6. In other words, the internal combustion engine side mount bracket 6 has a plurality of flat fixing surfaces 13 for fixing the vehicle body side mount bracket 7. The first fixing surface 13a to the third fixing surface 13c are formed at a predetermined distance from each other along the width direction of the internal combustion engine.

[0031] The first fixing surface 13a is located between the second fixing surface 13b and the third fixing surface 13c in the width direction of the internal combustion engine body 8. The first fixing surface 13a is formed so that the height position in the vertical direction along the cylinder axis L1 of the internal combustion engine body 8 is located lower than the second fixing surface 13b and the third fixing surface 13c. The first fixing surface 13a is formed so that the height position in the vertical direction along the cylinder axis L1 of the internal combustion engine body 8 is located lower than the first fastening points S1b and S1c. In other words, the first fixing surface 13a is formed so as to be located lower than the axial center position of the female thread formed on the internal combustion engine body 8 side into which the bolt passing through the second bolt through hole 11b is inserted, and the axial center position of the female thread formed on the internal combustion engine body 8 side into which the bolt passing through the third bolt through hole 11c is inserted.

[0032] The first fixing surface 13a is formed with a first internal combustion engine side bolt insertion hole 14a into which a bolt (not shown) for fixing the vehicle body side mount bracket 7 is inserted.

[0033] The second fixing surface 13b is located on one side (the left side in FIG. 3) of the first fixing surface 13a in the width direction of the internal combustion engine body 8. The second fixing surface 13b is formed so that its height position in the up-down direction along the cylinder axis L1 of the internal combustion engine body 8 is located above the first fastening points S1a, S1b, S1c. In other words, the second fixing surface 13b is formed on the upper part of the second bolt boss portion 12b.

[0034] The second fixing surface 13b is formed with a second internal combustion engine side bolt insertion hole 14b into which a bolt (not shown) for fixing the vehicle body side mounting bracket 7 is inserted.

[0035] The third fixed surface 13c is located on the other side (the right side in FIG. 3) of the first fixed surface 13a in the width direction of the internal combustion engine body 8. The third fixed surface 13c is formed so that its height position in the up-down direction along the cylinder axis L1 of the internal combustion engine body 8 is located above the first fastening points S1a, S1b, and S1c. In other words, the third fixed surface 13c is formed on the upper part of the third bolt boss portion 12c.

[0036] The third fixing surface 13c is formed with a third internal combustion engine side bolt insertion hole 14c into which a bolt (not shown) for fixing the vehicle body side mount bracket 7 is inserted.

[0037] The second fixing surface 13b and the third fixing surface 13c are formed so as to be at the same height position in the up-down direction along the cylinder axis L1 of the internal combustion engine body 8.

[0038] The vehicle body side mount bracket 7 corresponds to the second mount bracket, and is fixed to the internal combustion engine side mount bracket 6 with bolts (not shown) as shown in Figures 2 and 6. In addition, an insulator 15 for vibration prevention is attached to the vehicle body side mount bracket 7.

[0039] The vehicle body side mounting bracket 7 has an internal combustion engine side portion 16 that is attached to the fixing surface 13 of the internal combustion engine side mounting bracket 6, and a vehicle body side portion 17 to which the insulator 15 is attached.

[0040] The internal combustion engine side portion 16 has a rectangular parallelepiped base 18 arranged along the width direction of the internal combustion engine body 8 at the upper end of the internal combustion engine side mounting bracket 6, and a rectangular parallelepiped protrusion 19 extending from the center of the base 18 to the outside of the internal combustion engine side mounting bracket 6 along the cylinder row direction of the internal combustion engine body 8, and has an overall T-shape.

[0041] As shown in Fig. 6, the base 18 is formed with vehicle body bolt insertion holes 20 into which bolts (not shown) that connect the internal combustion engine side mount bracket 6 and the vehicle body side mount bracket 7 are inserted. The first vehicle body side bolt insertion hole 20a overlaps with the first internal combustion engine side bolt insertion hole 14a formed in the first fixing surface 13a. The second vehicle body side bolt insertion hole 20b overlaps with the second internal combustion engine side bolt insertion hole 14b formed in the second fixing surface 13b. The third vehicle body side bolt insertion hole 20c overlaps with the third internal combustion engine side bolt insertion hole 14c formed in the third fixing surface 13c.

[0042] The vehicle body side portion 17 has a main body portion 21 disposed on the front surface of the internal combustion engine side mount bracket 6, and a flange portion 22 protruding from the main body portion 21. The main body portion 21 has a bottom wall 23 and a pair of side walls 24 protruding from both ends of the bottom wall 23, and has an overall U-shape. The flange portion 22 protrudes outward from the tip of the side wall 24. The flange portion 22 has a bolt hole 25 through which a bolt (not shown) passes to fix the vehicle body side mount bracket 7 to the body of the vehicle.

[0043] The insulator 15 and the protruding portion 19 of the internal combustion engine side portion 16 are disposed inside the main body portion 21 of the vehicle body side portion 17. The insulator 15 and the protruding portion 19 of the internal combustion engine side portion 16 are located below a bottom wall 23 of the main body portion 21 of the vehicle body side portion 17 in the vertical direction of the internal combustion engine 1. The protruding portion 19 of the internal combustion engine side portion 16 is disposed above the insulator 15 inside the main body portion 21 of the vehicle body side portion 17 in the vertical direction of the internal combustion engine 1.

[0044] 2, the center position (center of gravity position) G of the insulator 15 is located lower than the first fastening points S1a, S1b, and S1c in the vertical direction along the cylinder axis L1 of the internal combustion engine body 8. Also, the center position G of the insulator 15 is located higher than the second fastening points S2a, S2b, and S2c in the vertical direction along the cylinder axis L1 of the internal combustion engine body 8.

[0045] The insulator 15 is disposed so that a center position G overlaps with the mount bracket 6 on the internal combustion engine side when viewed in the axial direction of the crankshaft of the internal combustion engine body 8 .

[0046] A center position G of the insulator 15 is located inside a contour line P that connects the six bolt through holes 11, the first bolt through hole 11a to the sixth bolt through hole 11f, in a single stroke into a ring shape when viewed in the axial direction of the crankshaft of the internal combustion engine body 8. In other words, a center position G of the insulator 15 is located inside a contour line P that connects the three first fastening points S1a, S1b, S1c and the three second fastening points S2a, S2b, S2c in a single stroke into a ring shape when viewed in the axial direction of the crankshaft of the internal combustion engine body 8.

[0047] In a power plant consisting of an internal combustion engine 1 and a transmission, a vibration occurs in which the whole plant twists around the crankshaft 9 as an axis due to a torsional vibration mode as shown by arrow A in Fig. 7. Fig. 7 is an explanatory diagram that shows a schematic example of a torsional vibration mode that occurs in a power plant. In a power plant consisting of an internal combustion engine 1 and a transmission, a node N of this torsional vibration mode occurs above the crankshaft 9 as shown in Fig. 7.

[0048] Furthermore, in a power plant consisting of the internal combustion engine 1 and the transmission, a vibration occurs in which the power plant is tilted in a direction of rotation about an axis parallel to the Y-axis described above, due to a tilting vibration mode as shown by arrow B in Fig. 8. Fig. 8 is an explanatory diagram that shows a schematic example of a tilting vibration mode that occurs in a power plant.

[0049] In the internal combustion engine 1 of the embodiment described above, the center position G of the insulator 15 is located lower than the first fastening points S1a, S1b, and S1c in the vertical direction of the internal combustion engine body 8. In other words, the center position G of the insulator 15 is located lower than the first fastening point S1a, which is the lowest first fastening point S in the vertical direction of the internal combustion engine body 8. This makes it possible for the internal combustion engine 1 to lower the center position G of the insulator 15.

[0050] Therefore, in the internal combustion engine 1, the center position G of the insulator 15 approaches the position of a node N of the torsional vibration mode of the power plant including the internal combustion engine 1, and vibration input to the vehicle can be suppressed with a simple configuration.

[0051] In addition, by lowering the center position G of the insulator 15, the input moment of the internal combustion engine side mount bracket 6 is reduced and the internal combustion engine side mount bracket 6 is prevented from falling over, thereby achieving overall vibration reduction (reduction of falling vibration) with a simple configuration.

[0052] The internal combustion engine 1 can be made lighter by making the front cover 5 from resin.

[0053] The internal combustion engine side mount bracket 6, which is located above the vibration center of the internal combustion engine 1, is fixed to the cylinder head 2 at first fastening points S1a, S1b, and S1c. This allows the internal combustion engine 1 to further suppress vibration input to the vehicle and further suppresses the internal combustion engine side mount bracket 6 from falling over.

[0054] The internal combustion engine side mount bracket 6 has a dimension along the vertical direction of the internal combustion engine body 8 set so that it is fixed to the cylinder head 2 at first fastening points S1a, S1b, and S1c, and is fixed to the cylinder block 3 at second fastening points S2a, S2b, and S2c. In other words, the internal combustion engine side mount bracket 6 is fixed to the internal combustion engine body 8 so as to straddle the cylinder head 2 and the cylinder block 3.

[0055] This allows the internal combustion engine 1 to more firmly fix the internal combustion engine side mount bracket 6 to the internal combustion engine body 8 with a simple structure.

[0056] The fixing surface 13 of the internal combustion engine side mount bracket 6 is formed so as to face upward in the vertical direction along the cylinder axis L1 of the internal combustion engine body 8.

[0057] As a result, the internal combustion engine 1 can be fixed so that the internal combustion engine side mount bracket 6 is suspended from the vehicle body side mount bracket 7 .

[0058] The internal combustion engine side mount bracket 6 is formed so that the first fastening points S1b, S1c are located higher in the up-down direction along the cylinder axis L1 of the internal combustion engine body 8 than the first fixing surface 13a.

[0059] This allows the internal combustion engine 1 to have a configuration in which the center position G of the insulator 15 can be easily set on the lower side in the up-down direction along the cylinder axis L1 of the internal combustion engine body 8.

[0060] The first fixing surface 13a of the internal combustion engine side mounting bracket 6 is formed so that its height position in the vertical direction along the cylinder axis L1 of the internal combustion engine body 8 is lower than the second fixing surface 13b and the third fixing surface 13c.

[0061] As a result, the internal combustion engine 1 can firmly fix the internal combustion engine side mount bracket 6 and the vehicle body side mount bracket 7, which are subjected to bending vibration due to the collapse vibration mode, with a simple structure.

[0062] The first fixing surface 13a of the internal combustion engine side mount bracket 6 is formed so that its height position in the vertical direction along the cylinder axis L1 of the internal combustion engine body 8 is located lower than the first fastening points S1b, S1c. The portion of the internal combustion engine side mount bracket 6 that is fixed to the vehicle body side mount bracket 7 is pressed against the internal combustion engine body 8, preventing it from floating up.

[0063] Therefore, the internal combustion engine side mount bracket 6 can firmly fix the part fixed to the vehicle body side mount bracket 7 to the internal combustion engine main body 8 with a simple configuration, and the collapse of the internal combustion engine side mount bracket 6 due to the collapse vibration mode can be further suppressed.

[0064] Although specific embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present invention.

[0065] For example, the internal combustion engine side mount bracket 6 may be formed so that at least one of the first fastening points S1a, S1b, S1c is located higher in the vertical direction along the cylinder axis L1 of the internal combustion engine body 8 than at least one of the first fixing surface 13a to the third fixing surface 13c. This allows the internal combustion engine 1 to be configured so that the center position G of the insulator 15 can be easily set lower in the vertical direction along the cylinder axis L1 of the internal combustion engine body 8.

[0066] For example, the internal combustion engine 1 may be formed such that at least one of the multiple fixing surfaces 13a to 13c is at a different height position in the up-down direction along the cylinder axis L1 of the internal combustion engine body 8 relative to the remaining (other) fixing surfaces 13.

[0067] For example, the internal combustion engine side mounting bracket 6 may be formed so that the vertical height position of the first fixing surface 13a along the cylinder axis L1 of the internal combustion engine body 8 is located lower than the first fastening points S1a, S1b, S1c.

[0068] For example, when the internal combustion engine 1 is installed in a hybrid vehicle for exclusive use in generating electricity, the power plant may be the internal combustion engine 1 and a generator connected to the internal combustion engine 1. [Explanation of symbols]

[0069] 1. Internal combustion engine 2. Cylinder head 3...Cylinder block 5…Front cover 6...Engine side mounting bracket (first mounting bracket) 7...Vehicle side mounting bracket (second mounting bracket) 8…Internal combustion engine body 11...Bolt through hole 12...Bolt boss part 12a…First bolt boss 12b…Second bolt boss section 12c…Third bolt boss section 12d…4th bolt boss section 12e…5th bolt boss section 12f…6th bolt boss section 13…Fixed surface 13a...first fixed surface 13b…Second fixed surface 13c...Third fixed surface 15…Insulator

Claims

1. The internal combustion engine body is supported on a vehicle body, and a mount bracket is provided to which an anti-vibration insulator is attached. The mount bracket has an upper edge portion on an upper side in the vertical direction of the internal combustion engine body fixed to the internal combustion engine body at a first fastening point, and a lower edge portion on a lower side in the vertical direction of the internal combustion engine body fixed to the internal combustion engine body at a second fastening point, An internal combustion engine, wherein a center position of the insulator is located lower in the vertical direction of the internal combustion engine body than a first fastening point that is the lowest in the vertical direction of the internal combustion engine body.

2. 2. The internal combustion engine according to claim 1, wherein the mount bracket is fixed to a cylinder head constituting a main body of the internal combustion engine at the first fastening point.

3. 3. The internal combustion engine according to claim 2, wherein the mount bracket is fixed to a cylinder block constituting a main body of the internal combustion engine at the second fastening point.

4. the mount bracket includes a first mount bracket fixed to the internal combustion engine body, and a second mount bracket supporting the internal combustion engine body on a vehicle body via the first mount bracket, 2. The internal combustion engine according to claim 1, wherein the first mounting bracket has a fixing surface for fixing the second mounting bracket, the fixing surface facing upward in the vertical direction of the internal combustion engine body.

5. The first mounting bracket has a plurality of fixing surfaces, The first mounting bracket is fixed to the internal combustion engine body at a plurality of first fastening points, 5. The internal combustion engine according to claim 4, wherein at least one of the first fastening points is formed to be located higher than at least one of the fixing surfaces in the up-down direction of the internal combustion engine body.

6. The first mounting bracket has a plurality of fixing surfaces, The first mounting bracket is fixed to the internal combustion engine body at a plurality of first fastening points, 5. The internal combustion engine according to claim 4, wherein the plurality of fixing surfaces are set such that at least one of the fixing surfaces is at a different height position in the vertical direction of the internal combustion engine body relative to the other fixing surfaces.

7. The first mounting bracket has three fixing surfaces formed thereon, The three fixing surfaces include a first fixing surface located at a center in a width direction of the internal combustion engine body, a second fixing surface located on one side of the first fixing surface in the width direction of the internal combustion engine body, and a third fixing surface located on the other side of the first fixing surface in the width direction of the internal combustion engine body, 7. The internal combustion engine according to claim 6, wherein the first fixing surface is formed so that its height position in the vertical direction of the internal combustion engine body is located lower than the second fixing surface and the third fixing surface.

8. 8. The internal combustion engine according to claim 7, wherein the first fixing surface is formed so that a height position in the up-down direction of the internal combustion engine body is located lower than the first fastening point.

9. 2. The internal combustion engine according to claim 1, wherein a center position of the insulator is located above the second fastening point in the up-down direction of the internal combustion engine body.

10. 2. The internal combustion engine according to claim 1, wherein the insulator is disposed so that a center position of the insulator overlaps with the mount bracket when viewed in the axial direction of the crankshaft of the internal combustion engine body.

11. The mount bracket has a plurality of first fastening points and a plurality of second fastening points, The internal combustion engine according to claim 1, characterized in that, when viewed in the axial direction of a crankshaft of the internal combustion engine body, a center position of the insulator is located inside a contour line that connects the first fastening point and the second fastening point in a ring shape.

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