V-shaped 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]

[0001] The present invention relates to a V-type internal combustion engine. [Background technology]

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

[0003] Each of the first and second banks is provided with one turbocharger connected to the cylinder head. The opening of the exhaust passage extending through the cylinder head opens to the outside of the V bank. Therefore, the turbocharger is provided on the outside of the V bank.

[0004] Each turbocharger has a flange. An upper end and a lower end of the flange are fastened to the cylinder head by bolts and nuts. The upper end is the end of the flange that is located on the upper side in the vertical direction of the engine. The lower end is the end of the flange that is located on the lower side in the vertical direction of the engine. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2014-058895 A Summary of the Invention [Problem to be solved by the invention]

[0006] It is assumed that the above-mentioned V-type internal combustion engine is modified so that the opening of the exhaust passage opens on the inside of the V-bank. That is, it is assumed that the intake and exhaust layout of the V-type internal combustion engine is modified from an outer exhaust layout to an inner exhaust layout. In this case, two turbochargers are arranged on the inside of the V-bank so as to be adjacent to each other in the direction in which the first bank and the second bank are arranged. In this case, it becomes necessary to fasten the flange to the cylinder head with bolts and nuts at both the outer end of the flange and the inner end of the flange. The inner end is an end of the flange that is located more inwardly of the V-bank than the inner end. In order to fasten the inner end of the flange to the cylinder head, it becomes necessary to insert a tool into the narrow space between the two turbochargers and fasten the bolts using the tool. This makes the assembly work difficult. [Means for solving the problem]

[0007] The means for solving the above problems and their effects will be described below. According to one aspect of the present disclosure, there is provided 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 to form a V-bank, each of the first bank and the second bank includes a cylinder block, a cylinder head attached to an upper part of the cylinder block, and a turbocharger attached to a mounting surface of the cylinder head inside the V-bank, the turbocharger of the first bank and the turbocharger of the second bank are adjacent to each other inside the V-bank in a direction in which the first bank and the second bank are aligned, 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, the mounting surface surrounds an opening of the exhaust passage that opens to the inside of the V-bank, an exhaust introduction pipe of the turbocharger has a flange at an 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 is located more inside the V-bank 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 as to approach the contact surface as it moves toward the outside of the V-bank, a bolt passes through the inclined surface and is inserted into a bolt hole provided in the cylinder head and fixed, and a nut is fastened to the bolt, thereby fixing the outer end to the cylinder head. Effect of the Invention

[0008] The flange can be fastened to the cylinder head without using bolts and nuts at the inner end, making the assembly work easy. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing a V-type internal combustion engine according to one embodiment. [Diagram 2] FIG. 2 is a perspective view showing a mounting surface of the second bank included in the V-type internal combustion engine of FIG. 1 before a pocket and a turbocharger are installed. [Diagram 3] FIG. 3 is a perspective view of the mounting surface shown in FIG. 2 with a pocket fixed thereto. [Figure 4] FIG. 4 is a perspective view of a turbocharger fixed to the mounting surface shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, a V-type internal combustion engine according to an embodiment will be described with reference to the drawings. As shown in FIG. 1, in a V-type internal combustion engine 100, the cylinders 12 of a first bank 10L and the cylinders 12 of a 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 includes a cylinder block 16, a cylinder head 18 attached to an upper portion of the cylinder block 16, and a turbocharger 40 attached to a 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 an integral part. The mounting surface 20 of the first bank 10L is horizontal. The mounting surface 20 of the second bank 10R is inclined so as to be lower toward 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 arranged.

[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 introduction pipe 42 of the turbocharger 40 has a flange 44 at its end. The flange 44 is fastened to the mounting surface 20, so that the opening of the exhaust passage 24 is connected to the exhaust introduction pipe 42.

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

[0014] The inner end 46 is inserted into a pocket 30 that is provided on the mounting surface 20 and opens toward the outside of the V-bank 14. The pocket 30 is fixed to the mounting surface 20 by a bolt 32 and a nut 34.

[0015] The outer end 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 as to approach the contact surface 50 toward the outside of 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 for fixing. A nut 64 is fastened to the bolt 60, thereby fixing the outer end 48 to the cylinder head 18.

[0016] <Action of this embodiment> A method of assembling two turbochargers 40 will be described with reference to Figures 1 to 4. Figures 2 to 4 show the sequence of work for assembling turbocharger 40 for second bank 10R. The work for assembling turbocharger 40 is similar for first bank 10L.

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

[0018] First, for each of the first bank 10L and the second bank 10R, the pocket 30 is fixed to the mounting surface 20 with the bolts 32 and nuts 34. Fig. 3 shows the state in which the pocket 30 for the second bank 10R is fixed to the mounting surface 20. The pocket 30 is fixed at a position on the inside of the V-bank 14 relative to the opening of the exhaust passage 24, with an opening facing 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 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, the bolt 60 is inserted through the inclined surface 52 and into the bolt hole 62 provided in the cylinder head 18 and fixed. Furthermore, the nut 64 is fastened to the bolt 60, thereby fixing the outer end 48 to the cylinder head 18. FIG. 4 shows a state in which the outer end 48 of the second bank 10R is fixed to the cylinder head 18. Similarly, for the first bank 10L, the outer end 48 is fixed to the cylinder head 18 by fastening the nut 64 to the bolt 60 that has passed through 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. Therefore, as the nut 64 is tightened onto the bolt 60, the flange 44 is pressed toward the inside of the V-bank 14. Finally, the inner end 46 abuts against the pocket 30 inside the pocket 30.

[0021] In this manner, the two turbochargers 40 are assembled. The process of fixing the pocket 30 to the mounting surface 20 with the bolts 32 and nuts 34 is completed before the two turbochargers 40 are assembled. Therefore, the following effects are obtained.

[0022] <Effects of this embodiment> (1) The flange 44 has an outer end 48 and an inner end 46 that is located more inward of the V-bank 14 than the outer end 48. The flange 44 is fastened to the cylinder head 18 with the inner end 46 inserted into the pocket 30 and the outer end 48 fastened with a bolt 60. Therefore, the flange 44 can be fastened to the cylinder head 18 without using bolts and nuts for the inner end 46. This makes the assembly work easy.

[0023] (2) The mounting surface 20 of the first bank 10L is horizontal. With the inner end 46 of the flange 44 inserted into the pocket 30, the flange 44 is fastened to the cylinder head 18. In this embodiment, the mounting surface 20 of the first bank 10L is horizontal. Therefore, before the flange 44 is fastened to the cylinder head 18, the inner end 46 of the flange 44 inserted into the pocket 30 is prevented from falling out of the pocket 30 due to the weight of the turbocharger 40. Therefore, according to this embodiment, the assembly work is easier than in a configuration in which the mounting surface 20 of the first bank 10L is inclined so as to be higher toward the inside of the V-bank 14.

[0024] (3) The mounting surface 20 of the second bank 10R is inclined so as to become lower toward the inside of the V-bank 14. When the mounting surface 20 is horizontal, the bolt 60 extends from the inclined surface 52 at an incline toward the outside of the V bank 14. If the mounting surface 20 is inclined so that it is 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. If the bolt 60 for fastening the outer end 48 located on the outside of the V bank 14 extends at an incline toward the outside of the V bank 14, it is difficult to perform the fastening operation. In contrast, according to this embodiment, the insertion angle of the bolt 60 in the second bank 10R approaches vertical, making the fastening operation easier. This improves the ease of assembly.

[0025] <Example of change> This embodiment can be modified as follows: This embodiment and the following modifications can be combined with each other to the extent that there is no technical contradiction.

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

[0027] In the above embodiment, the mounting surface 20 of the first bank 10L is horizontal, and the mounting surface 20 of the second bank 10R is inclined. However, this is merely an example. The mounting surface 20 of the first bank 10L may be inclined so as to become lower toward the inside of the V-bank 14, and the mounting surface 20 of the second bank 10R may be horizontal. [Explanation of symbols]

[0028] 10L...first bank, 10R...second 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 introduction 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 a first bank of cylinders and a second bank of cylinders are arranged in a V shape to form a V bank, Each of the first bank and the second bank includes a cylinder block, a cylinder head attached to an upper portion of the cylinder block, and a turbocharger attached to a mounting surface of the cylinder head located inside a V bank, the turbocharger of the first bank and the turbocharger of the second bank are adjacent to each other on the inside of the V bank in a direction in which the first bank and the second bank are arranged, 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 an opening of the exhaust passage that opens to the inside of the V bank, The exhaust introduction pipe of the turbocharger has a flange at an end thereof, The flange is fastened to the mounting surface, whereby the opening of the exhaust passage is connected to the exhaust introduction pipe, the flange has an inner end and an outer end that are located on opposite sides of the exhaust introduction pipe and contact the mounting surface, the inner end being located more inward of the V-bank than the outer end, the inner end portion is inserted into a pocket that is provided on the mounting surface and that opens toward an outside of the V-bank, the outer end portion has a contact surface that contacts the mounting surface, and an inclined surface that is inclined with respect to the contact surface so as to approach the contact surface as it moves toward the outside of the V-bank, A bolt passes through the inclined surface and is inserted into a bolt hole provided in the cylinder head and fixed thereto. A nut is fastened to the bolt, thereby fixing the outer end to the cylinder head. V-type internal combustion engine.

2. the mounting surface of the first bank is horizontal; 2. A V-type internal combustion engine according to claim 1.

3. the mounting surface of the second bank is inclined so as to become lower toward the inside of the V-bank; 3. A V-type internal combustion engine according to claim 1 or 2.

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