V-type internal combustion engine

Abstract

To provide a V-shaped internal combustion engine which facilitates assembly of two adjacent turbo chargers.SOLUTION: A turbo charger 40 of a first bank 10L and a turbo charger 40 of a second bank 10R are located adjacent to each other at the inner side of a V bank. An exhaust introduction pipe 42 of each turbo charger 40 has a flange 44 at an end. The flange 44 is fastened to a mounting surface 20 to connect an opening of an exhaust passage 24 to the exhaust introduction pipe 42. The flange 44 has an inner end 46 and an outer end 48 which contact with the mounting surface 20. The inner end 46 is provided on the mounting surface 20 and inserted into a pocket 30 which is open to the outer side of the V bank. A nut 64 is tightened to a bolt 60 at the outer end 48 to fix the outer end 48 to a cylinder head 18.SELECTED DRAWING: Figure 1

Description

Technical Field

[0006] , ,

[0001] This invention relates to a V-type internal combustion engine.

Background Art

[0002] Patent Document 1 discloses a V-type internal combustion engine in which cylinders of a first bank and cylinders of a second bank are arranged in a V shape. The first bank and the second bank constitute a V bank. The space sandwiched between the first bank and the second bank is the space inside the V bank.

[0003] Each of the first bank and the second bank includes one turbocharger connected to a cylinder head. An opening of an exhaust passage extending through the cylinder head opens to the outside of the V bank. Therefore, the turbocharger is provided outside the V bank.

[0004] Each turbocharger has a flange. The upper end portion and the lower end portion of the flange are respectively fastened to the cylinder head by bolts and nuts. The upper end portion is the end portion of the flange that is located on the upper side in the up-and-down direction of the engine. The lower end portion is the end portion of the flange that is located on the lower side in the up-and-down direction of the engine.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Let's consider a case where the V-type internal combustion engine described above is modified so that the exhaust passage opening opens on the inside of the V-bank. In other words, let's consider a case where the intake and exhaust layout of the V-type internal combustion engine is changed from an external exhaust layout to an internal exhaust layout. In this case, the two turbochargers are positioned adjacent to each other on the inside of the V-bank, in the direction in which the first and second banks are aligned. In this case, it becomes necessary to fasten the flange to the cylinder head with bolts and nuts at both the outer end and the inner end of the flange. The inner end is the end of the flange that is located further inside the V-bank. The outer end is the end of the flange that is located further outside the V-bank than the inner end. In order to fasten the inner end of the flange to the cylinder head, it is necessary to insert a tool into the narrow space between the two turbochargers and use that tool to fasten the bolts. Therefore, the assembly work is difficult. [Means for solving the problem]

[0007] The following describes the means and effects of solving the above problems. According to one aspect of the present disclosure, a V-type internal combustion engine is provided in which the cylinders of a first bank and the cylinders of a second bank are arranged in a V-shape to form a V-bank, each of the first bank and the second bank comprising a cylinder block, a cylinder head mounted on the upper part of the cylinder block, and a turbocharger mounted on the mounting surface of the cylinder head located inside the V-bank, wherein the turbocharger of the first bank and the turbocharger of the second bank are adjacent to each other in the direction in which the first bank and the second bank are aligned inside the V-bank, the cylinder head has an intake passage opening to the outside of the V-bank and an exhaust passage opening to the inside of the V-bank, the mounting surface surrounds the opening of the exhaust passage opening to the inside of the V-bank, and the exhaust inlet pipe of the turbocharger has a flange at its end, A V-type internal combustion engine is provided, wherein the flange is fastened to the mounting surface so that the opening of the exhaust passage is connected to the exhaust inlet pipe, the flange has an inner end and an outer end that are on opposite sides of the exhaust inlet pipe and contact the mounting surface, the inner end is located inside the V-bank more than the outer end, the inner end is inserted into a pocket provided on the mounting surface and opening toward the outside of the V-bank, the outer end has a contact surface that contacts the mounting surface and an inclined surface that is inclined with respect to the contact surface so that it approaches the contact surface as it moves toward the outside of the V-bank, and the outer end is fixed to the cylinder head by a bolt that passes through the inclined surface and is inserted into a bolt hole provided in the cylinder head and fixed, and a nut that is fastened to the bolt. [Effects of the Invention]

[0008] The flange can be fastened to the cylinder head without using bolts and nuts on the inner end. Therefore, assembly work is easy. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 shows a V-type internal combustion engine according to one embodiment. [Figure 2] Figure 2 is a perspective view showing the mounting surface of the second bank of the V-type internal combustion engine in Figure 1, before the installation of the pocket and turbocharger. [Figure 3] Figure 3 is a perspective view showing the pocket fixed to the mounting surface shown in Figure 2. [Figure 4] Figure 4 is a perspective view showing the turbocharger fixed to the mounting surface shown in Figure 3. [Modes for carrying out the invention]

[0010] A V-type internal combustion engine according to one embodiment will be described below with reference to the drawings. As shown in Figure 1, in the V-type internal combustion engine 100, the cylinders 12 of the first bank 10L and the cylinders 12 of the second bank 10R are arranged in a V-shape to form a V-bank 14. Each of the first bank 10L and the second bank 10R comprises a cylinder block 16, a cylinder head 18 mounted on the upper part of the cylinder block 16, and a turbocharger 40 mounted on the mounting surface 20 of the cylinder head 18 located inside the V-bank. In this embodiment, the cylinder block 16 of the first bank 10L and the cylinder block 16 of the second bank 10R are integral parts. The mounting surface 20 in the first bank 10L is horizontal. The mounting surface 20 in the second bank 10R is inclined so that it becomes lower towards the inside of the V-bank 14.

[0011] The turbocharger 40 of the first bank 10L and the turbocharger 40 of the second bank 10R are adjacent to each other on the inside of the V-bank, in the direction in which the first bank 10L and the second bank 10R are aligned.

[0012] The cylinder head 18 has an intake passage 22 that opens to the outside of the V-bank and an exhaust passage 24 that opens to the inside of the V-bank. The mounting surface 20 surrounds the opening of the exhaust passage 24 that opens to the inside of the V-bank. The exhaust inlet pipe 42 of the turbocharger 40 has a flange 44 at its end. The opening of the exhaust passage 24 is connected to the exhaust inlet pipe 42 when the flange 44 is fastened to the mounting surface 20.

[0013] The flange 44 has an inner end 46 and an outer end 48 that are on opposite sides of the exhaust inlet pipe 42 and contact the mounting surface 20, with the inner end 46 located further inside the V-bank 14 than the outer end 48.

[0014] The inner end portion 46 is inserted into a pocket 30 provided on the mounting surface 20 and opening outwards from the V-bank 14. The pocket 30 is fixed to the mounting surface 20 by bolts 32 and nuts 34.

[0015] The outer end portion 48 has a contact surface 50 that contacts the mounting surface 20, and an inclined surface 52 that is inclined relative to the contact surface 50 so that it approaches the contact surface 50 as it moves outward from the V-bank 14. A bolt 60 passes through the inclined surface 52 and is inserted into a bolt hole 62 provided in the cylinder head 18 to secure it. The outer end portion 48 is fixed to the cylinder head 18 by fastening a nut 64 to the bolt 60.

[0016] <Operation of this embodiment> The assembly method for the two turbochargers 40 will be explained with reference to Figures 1 to 4. Figures 2 to 4 show the steps for assembling the turbocharger 40 for the second bank 10R. The assembly procedure for the turbocharger 40 is the same for the first bank 10L.

[0017] The first bank 10L and the second bank 10R will be described starting from the state in which the cylinder head 18 is attached to the upper part of the cylinder block 16. Figure 2 shows the mounting surface 20 of the second bank 10R in this state. That is, Figure 2 is a perspective view of the second bank 10R shown in Figure 1, showing the mounting surface 20 before the installation of the pocket 30 and turbocharger 40. The bolt holes 62 and the opening for the exhaust passage 24 are also provided on the mounting surface 20 for the first bank 10L.

[0018] First, for each of the first bank 10L and the second bank 10R, the pocket 30 is fixed to the mounting surface 20 by bolts 32 and nuts 34. FIG. 3 shows the state in which the pocket 30 is fixed to the mounting surface 20 for the second bank 10R. The pocket 30 is fixed in a position inside the V-bank 14 from the opening of the exhaust passage 24 and in an orientation opening toward the outside of the V-bank 14. Therefore, in the case of the first bank 10L, the position and orientation of the pocket 30 attached to the mounting surface 20 are opposite to the state shown in FIG. 3.

[0019] Next, for each of the first bank 10L and the second bank 10R, the inner end portion 46 of the flange 44 of the turbocharger 40 is inserted into the pocket 30. Next, for each of the first bank 10L and the second bank 10R, bolts 60 penetrate the inclined surface 52 and are inserted and fixed into bolt holes 62 provided in the cylinder head 18. Further, by fastening a nut 64 to the bolt 60, the outer end portion 48 is fixed to the cylinder head 18. FIG. 4 shows the state in which the outer end portion 48 is fixed to the cylinder head 18 for the second bank 10R. Similarly for the first bank 10L, the outer end portion 48 is fixed to the cylinder head 18 by fastening a nut 64 to the bolt 60 that has penetrated the inclined surface 52.

[0020] The inclined surface 52 is inclined with respect to the contact surface 50 so as to approach the contact surface 50 toward the outside of the V-bank 14. Also, as shown in FIG. 4, the bolt 60 extends through a U-shaped opening formed in the flange 44. For this reason, as the nut 64 is fastened to the bolt 60, the flange 44 is pushed inward of the V-bank 14. Finally, the inner end portion 46 abuts against the pocket 30 inside the pocket 30.

[0021] In the above manner, two turbochargers 40 are assembled. The step of fixing the pocket 30 to the mounting surface 20 by bolts 32 and nuts 34 is completed before the assembly of the two turbochargers 40. For this reason, the effects described below can be obtained.

[0022] <Effects of the Present Embodiment> (1) The flange 44 has an outer end portion 48 and an inner end portion 46 located inside the V-bank 14 rather than the outer end portion 48. The flange 44 is fastened to the cylinder head 18 in a state where the inner end portion 46 is inserted into the pocket 30 and the outer end portion 48 is fastened with the bolt 60. Therefore, the flange 44 can be fastened to the cylinder head 18 without using bolts and nuts for the inner end portion 46. Thus, the assembly work is easy.

[0023] (2) The mounting surface 20 in the first bank 10L is horizontal. The flange 44 is fastened to the cylinder head 18 with the inner end portion 46 of the flange 44 inserted into the pocket 30. In the present embodiment, the mounting surface 20 in the first bank 10L is horizontal. Therefore, in a state before the flange 44 is fastened to the cylinder head 18, it is possible to prevent the inner end portion 46 of the flange 44 inserted into the pocket 30 from falling out of the pocket 30 due to the weight of the turbocharger 40. For this reason, according to the present embodiment, compared with a configuration in which the mounting surface 20 in the first bank 10L is inclined so that it becomes higher toward the inside of the V-bank 14, the assembly work is easy.

[0024] (3) The mounting surface 20 in the second bank 10R is inclined so that it becomes lower toward the inside of the V-bank 14. In a state where the mounting surface 20 is horizontal, the bolt 60 extends inclined outward from the V-bank 14 from the inclined surface 52. If the mounting surface 20 is inclined so that it becomes lower toward the inside of the V-bank 14, the insertion angle of the bolt 60 can be made closer to vertical than when the mounting surface 20 is horizontal. When the bolt 60 for fastening the outer end portion 48 located outside the V-bank 14 extends in an inclined state outside the V-bank 14, the fastening work is difficult. On the other hand, according to the present embodiment, in the second bank 10R, since the insertion angle of the bolt 60 approaches vertical, the fastening work becomes easy. Thus, the assembly workability can be improved.

[0025] <Example of changes> This embodiment can be implemented with the following modifications. This embodiment and the following modifications can be combined with each other to the extent that they do not contradict each other technically.

[0026] In the above embodiment, the mounting surface 20 in the second bank 10R is inclined to become lower towards the inside of the V bank 14. Alternatively, the mounting surface 20 in the second bank 10R may be horizontal.

[0027] In the above embodiment, the mounting surface 20 in the first bank 10L is horizontal, and the mounting surface 20 in the second bank 10R is inclined. However, this is merely an example. The mounting surface 20 in the first bank 10L may be inclined so that it becomes lower towards the inside of the V bank 14, and the mounting surface 20 in the second bank 10R may be horizontal. [Explanation of Symbols]

[0028] 10L…1st bank, 10R…2nd bank, 12…cylinder, 14…V-bank, 16…cylinder block, 18…cylinder head, 20…mounting surface, 22…intake passage, 24…exhaust passage, 30…pocket, 40…turbocharger, 42…exhaust inlet pipe, 44…flange, 46…inner end, 48…outer end, 50…contact surface, 52…inclined surface, 60…bolt, 62…bolt hole, 64…nut, 100…V-type internal combustion engine

Claims

1. A V-type internal combustion engine in which the cylinders of the first bank and the cylinders of the second bank are arranged in a V-shape to form a V-bank, Each of the first and second banks comprises a cylinder block, a cylinder head mounted on the upper part of the cylinder block, and a turbocharger mounted on the mounting surface of the cylinder head located inside the V-bank. The turbocharger of the first bank and the turbocharger of the second bank are adjacent to each other in the direction in which the first bank and the second bank are aligned, on the inside of the V bank. The cylinder head has an intake passage that opens to the outside of the V-bank and an exhaust passage that opens to the inside of the V-bank, and the mounting surface surrounds the opening of the exhaust passage that opens to the inside of the V-bank. The exhaust inlet pipe of the turbocharger has a flange at its end. The flange is fastened to the mounting surface, thereby connecting the opening of the exhaust passage to the exhaust inlet pipe. The flange has an inner end and an outer end that are on opposite sides of the exhaust inlet pipe and contact the mounting surface, the inner end being located further inside the V-bank than the outer end, The inner end is inserted into a pocket provided on the mounting surface and opening outwards from the V-bank. The outer end has a contact surface that contacts the mounting surface and an inclined surface that is inclined with respect to the contact surface so as it moves outward from the V-bank, The bolt penetrates the inclined surface and is inserted into a bolt hole provided in the cylinder head and fixed in place. The outer end is fixed to the cylinder head by fastening the nut to the bolt. V-type internal combustion engine.

2. The mounting surface in the first bank is horizontal. The V-type internal combustion engine according to claim 1.

3. The mounting surface in the second bank is inclined such that it becomes lower towards the inside of the V-bank. A V-type internal combustion engine according to claim 1 or 2.

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