JP2004204690A - V type 18-cylinder engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a V type 18-cylinder engine setting an ignition order capable of reducing torsional vibration and an unbalanced moment of a crankshaft. <P>SOLUTION: In this V type 18-cylinder engine, crank pins are equally disposed in the order of a first crank pin, a ninth crank pin, a second crank pin, a seventh crank pin, a forth crank pin, a fifth crank pin, a sixth crank pin, a third crank pin and a eighth crank pin. The ignition order is set in the order of a right bank first cylinder, a left bank eighth cylinder, a right bank second cylinder, a left bank ninth cylinder, a right bank forth cylinder, a left bank seventh cylinder, a right bank sixth cylinder, a left bank fifth cylinder, a right bank eighth cylinder, a left bank third cylinder, a right bank ninth cylinder, a left bank first cylinder, a right bank seventh cylinder, a left bank second cylinder, a right bank fifth cylinder, a left bank forth cylinder, a right bank third cylinder and a left bank sixth cylinder. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a V-type 18-cylinder engine.
[0002]
[Prior art]
Conventionally, if the torsional vibration of the engine increases, the rattling noise of the gear train driven by the engine will increase, pitching of the gear tooth surface will occur, and the crankshaft will be broken. Is taken into account. In particular, the ignition sequence of the V-type 18-cylinder engine can be designed in an extremely large number of combinations, and the number of combinations is as large as about 20,000. Those that are considered to be the minimum are selected. Non-Patent Document 1 discloses an ignition sequence that is considered to minimize the torsional vibration and unbalance moment of the crankshaft in calculation. The ignition sequence shown in Non-Patent Document 1 is as shown in FIG.
Right bank first cylinder C1R → Left bank first cylinder C1L → Right bank second cylinder C2R → Left bank second cylinder C2L → Right bank fourth cylinder C4R → Left bank fourth cylinder C4L → Right bank sixth cylinder C6R → Left Bank sixth cylinder C6L → right bank eighth cylinder C8R → left bank eighth cylinder C8L → right bank ninth cylinder C9R → left bank ninth cylinder C9L → right bank seventh cylinder C7R → left bank seventh cylinder C7L → right bank. Fifth cylinder C5R → left bank fifth cylinder C5L → right bank third cylinder C3R → left bank third cylinder C3L
It has become. The circled numbers in FIG. 5 indicate the firing order.
[0003]
[Non-patent document 1]
W. Ker Wilson, PRACTICAL SOLUTION OF TORSIONAL VIBRATION PROBLEMS
With Examples from Marine, Electrical, Aeronautical, and Automobile Engineering Practice, "John Wiley & Sons Inc. Publishing Third edition: 1963 [0004]
[Problems to be solved by the invention]
However, in order to further reduce the torsional vibration of the crankshaft of the V-type 18-cylinder engine using the ignition sequence of Non-Patent Document 1, the shaft diameter of the crankshaft must be increased, and the weight of the engine increases. Would. In recent years, high-speed operation has also been required for a V-type 18-cylinder engine. However, in a V-type 18-cylinder engine using the ignition sequence of Non-Patent Document 1, torsional vibration increases, which is disadvantageous for high-speed operation.
[0005]
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a V-type 18-cylinder engine in an ignition sequence capable of reducing torsional vibration and unbalance moment of a crankshaft.
[0006]
Means for Solving the Problems, Functions and Effects
In order to achieve the above object, a first invention is a V-type 18-cylinder engine, wherein the bank angle of the left and right cylinders is from 40 degrees to 120 degrees, and the pair of left and right pistons is connected to the same crankpin, The arrangement of the crank pins is as follows: the first crank pin → the ninth crank pin → the second crank pin → the seventh crank pin → the fourth crank pin → the fifth crank pin → the sixth crank pin → the third crank pin → the eighth crank pin. And the ignition sequence is as follows: right bank first cylinder → left bank eighth cylinder → right bank second cylinder → left bank ninth cylinder → right bank fourth cylinder → left bank seventh cylinder → right bank 6th cylinder → 5th cylinder in left bank → 8th cylinder in right bank → 3rd cylinder in left bank → 9th cylinder in right bank → 1st cylinder in left bank → 7th cylinder in right bank → 2nd cylinder in left bank → 5th bank in right bank Cylinder → left bank It has a configuration that is the order of the cylinders → right bank third cylinder → left bank sixth cylinder.
[0007]
According to the first invention, while the pair of left and right cylinders of the left and right banks are ignited, a pair of cylinders that has been ignited first is different from the engine that has been ignited first, and the first ignition is performed. Since one cylinder in the bank opposite to the cylinder can be ignited, the location where the torsional force is applied to the crankshaft is dispersed, and the torsional vibration can be greatly reduced.
[0008]
According to a second aspect, in the first aspect, the bank angle of the left and right cylinders is set to 60 degrees.
[0009]
According to the second invention, the torsional stress of the crankshaft is reduced to 80% of the conventional value and the torsion angle is reduced to one-fourth of the conventional engine in the order of ignition.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a conceptual diagram of a crankshaft 11 of an engine according to the present invention. FIG. 2 is a conceptual diagram showing the arrangement of the crank pins of the crankshaft 11 of the present invention. FIG. 3 is a conceptual diagram showing a bank angle of the engine of the present invention. FIG. 4 is a conceptual diagram showing an ignition sequence of the engine of the present invention.
[0011]
In FIG. 1, the left side shows the front of the engine, and the numbers show the numbers of the crankpins. The X direction is above the engine and the Y direction is to the left of the engine. The engine of the present invention is a V-type 18-cylinder engine, and a crankpin is provided on a crankshaft 11 from a front portion of the crankshaft 11, a first crankpin P1, a second crankpin P2, a third crankpin P3, and a fourth crankpin. The crankpin P4, the fifth crankpin P5, the sixth crankpin P6, the seventh crankpin P7, the eighth crankpin P8, and the ninth crankpin P9 are provided at nine positions in this order.
[0012]
Then, as shown in FIG. 2, the arrangement of the crankpin is counterclockwise with respect to the position where the first crankpin P <b> 1 is arranged at the uppermost position when viewed from the front of the engine, that is, from the front of the crankshaft 11. In the direction, the first crank pin P1 → the ninth crank pin P9 → the second crank pin P2 → the seventh crank pin P7 → the fourth crank pin P4 → the fifth crank pin P5 → the sixth crank pin P6 → the third crank pin P3 → Eighth crank pins P8 are arranged in the same order, that is, they are arranged at an angle shifted by 40 degrees. The rotation direction of the crankshaft 11 is clockwise clockwise rotation as shown by the arrow. Note that the rotation center CL indicates the rotation center of the crankshaft 11.
[0013]
As shown in FIG. 3, in the first cylinders of the left and right banks, the piston 12 of the right bank first cylinder C1R is connected to the first crankpin P1 of the crankshaft 11 by the connecting rod 13, and the left bank first cylinder C1L The piston 12 is connected to a first crankpin P1 of the crankshaft 11 by a connecting rod 13. That is, the pistons 12, 12 of the pair of left and right cylinders of the right bank and the left bank are connected to the same crankpin. The angle between the center of the first cylinder C1R and the center of the left bank first cylinder C1L, that is, the bank angle is 60 degrees. Note that the bank angle of the engine of the present invention is, for example, 60 degrees, but the bank angle may be in a range of more than 40 degrees and less than 120 degrees. The same applies to the second to ninth cylinders of the left and right banks, and thus the description is omitted.
[0014]
The ignition sequence of the engine of the present invention is, as shown in FIG. 4, the right bank first cylinder C1R → the left bank eighth cylinder C8L → the right bank second cylinder C2R → the left bank ninth cylinder C9L → the right bank fourth cylinder C4R. → Left bank seventh cylinder C7L → Right bank sixth cylinder C6R → Left bank fifth cylinder C5L → Right bank eighth cylinder C8R → Left bank third cylinder C3L → Right bank ninth cylinder C9R → Left bank first cylinder C1L → The order is as follows: right bank seventh cylinder C7R → left bank second cylinder C2L → right bank fifth cylinder C5R → left bank fourth cylinder C4L → right bank third cylinder C3R → left bank sixth cylinder C6L. The circled numbers in FIG. 4 indicate the firing order.
[0015]
FIG. 4 shows the positions of the cylinders corresponding to the positions of the crankpins of the crankshaft 11, and shows that the positions of the cylinders on the same side of the left and right banks are shifted by an angle of 40 degrees. This indicates that the relative angle between the pair of cylinders is shifted by 60 degrees. For example, the right bank first cylinder C1R is shifted by 40 degrees from the right bank ninth cylinder C9R, and the right bank eighth cylinder C8R is shifted by 60 degrees from the left bank eighth cylinder C8L.
[0016]
As described above, the engine of the present invention ignites in the order of the circle numbers in FIG. 4, the right bank first cylinder C1R in the right bank of the left and right banks ignites, and then the left bank in the left bank. The eighth cylinder C8L is ignited, and then the right bank second cylinder C2R in the right bank is ignited, and thereafter, it is similarly ignited in the order shown in FIG. In the conventional ignition sequence of Non-Patent Document 1, the right bank first cylinder on the right side of a pair of cylinders on the left and right banks is ignited, then the left left bank first cylinder is ignited, and then the left and right bank one pair. The right bank second cylinder on the right side of the cylinder is ignited, and then the left bank second cylinder on the left side is ignited.
[0017]
That is, in the conventional ignition sequence, the pair of left and right cylinders of the left and right banks is continuously ignited, whereas in the ignition sequence of the engine of the present invention, the pair of left and right cylinders of the left and right banks are ignited. In the meantime, one pair of cylinders in the bank opposite to the previously ignited cylinder is ignited. Therefore, the locations where the torsional force is applied to the crankshaft 11 are dispersed, and the torsional vibration can be significantly reduced.
[0018]
As a result, the torsional stress of the crankshaft 11 according to the conventional ignition sequence of Non-Patent Document 1 is 10609 PSI and the torsion angle is 0.451 degrees, whereas the torsion of the crankshaft 11 according to the ignition sequence of the engine of the present invention is performed. The stress is 8636 PSI and the torsion angle is 0.121 degrees. The torsion stress of the crankshaft is reduced to 80% of the conventional one and the torsion angle is reduced to one-fourth of that of the conventional engine with the ignition sequence. it can.
[0019]
Further, if the bank angle is in the range of 40 degrees to 120 degrees, for example, in FIG. 4, the left bank eighth cylinder C8L is used for the ignition of the right bank first cylinder C1R and the ignition of the right bank second cylinder C2R. Similarly, while the pair of left and right cylinders of the left and right banks are ignited, one of the banks on the other side of the pair opposite to the previously ignited cylinder is different from the previously ignited cylinder. One cylinder can be ignited, the locations where the torsional force is applied to the crankshaft 11 are dispersed, and the torsional vibration can be significantly reduced.
[0020]
The ignition sequence of the engine of the present invention can be applied to a diesel engine, a gasoline engine, and other reciprocating engines.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram of a crankshaft of an engine of the present invention.
FIG. 2 is a conceptual diagram showing an arrangement of a crankpin of a crankshaft according to the present invention.
FIG. 3 is a conceptual diagram showing a bank angle of the engine of the present invention.
FIG. 4 is a conceptual diagram showing an ignition sequence of the engine of the present invention.
FIG. 5 is a conceptual diagram showing an ignition sequence of a conventional engine.
[Explanation of symbols]
11 ... Crankshaft, 12 ... Piston, 13 ... Connecting rod, C1R ... Right bank first cylinder, C1L ... Left bank first cylinder, C2R ... Right bank second cylinder, C2L ... Left bank second cylinder, C3R ... Right bank Third cylinder, C3L left bank third cylinder, C4R right bank fourth cylinder, C4L left bank fourth cylinder, C5R right bank fifth cylinder, C5L left bank fifth cylinder, C6R right bank sixth Cylinder, C6L: Left bank sixth cylinder, C7R: Right bank seventh cylinder, C7L: Left bank seventh cylinder, C8R: Right bank eighth cylinder, C8L: Left bank eighth cylinder, C9R: Right bank ninth cylinder, C9L: left bank ninth cylinder, P1: first crank pin, P2: second crank pin, P3: third crank pin, P4: fourth crank pin, P5: fifth crank pin, P6: sixth crank pin, 7 ... 7 crankpin, P8 ... eighth crank pin, P9 ... ninth crank pin.

Claims (2)

In a V-type 18 cylinder engine,
The bank angle of the left and right cylinders is from 40 degrees to 120 degrees,
The pair of left and right pistons are connected to the same crank pin,
The arrangement of the crank pin
1st crankpin → 9th crankpin → 2nd crankpin → 7th crankpin → 4th crankpin → 5th crankpin → 6th crankpin → 3rd crankpin → 8th crankpin Yes,
Ignition order,
Right bank first cylinder → left bank eighth cylinder → right bank second cylinder → left bank ninth cylinder → right bank fourth cylinder → left bank seventh cylinder → right bank sixth cylinder → left bank fifth cylinder → right bank 8th cylinder → 3rd cylinder in left bank → 9th cylinder in right bank → 1st cylinder in left bank → 7th cylinder in right bank → 2nd cylinder in left bank → 5th cylinder in right bank → 4th cylinder in left bank → 3rd bank in right bank A V-type 18-cylinder engine, characterized in that the cylinders are arranged in the order of the left bank sixth cylinder. 2. The V-type 18-cylinder engine according to claim 1, wherein the bank angle of the left and right cylinders is 60 degrees.

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