JPH08338209A - V-type engine - Google Patents

Abstract

PURPOSE: To suppress fluctuation in combustion between left and right banks in a V-type engine so as to reduce vibration during idling. CONSTITUTION: A V-type engine is provided with a first bank 1, a second bank 2, a first and a second intake valve driving cam shafts 4, 6 arranged on the center side of the respective banks, a first and a second exhaust valve driving cam shafts 5, 7 arranged on the outside of the respective banks, and a single timing belt 12 rotating in the direction in which the timing belt 12 advances from the first bank 1 to the second bank 2. Advance correction for a rotational phase of the first intake valve driving cam shaft 4 is carried out so as to correct a deviation of closing timing in the first intake valve driving cam shaft 4, while lag correction for a rotational phase of the first exhaust valve driving cam shaft 5 is carried out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a V-type engine which drives an intake valve side camshaft and an exhaust valve side camshaft with a single timing belt.

[0002]

2. Description of the Related Art Among conventional V-type engines in which cylinder rows are arranged in left and right banks, a DOHC type V-type in which camshafts for driving intake and exhaust valves are respectively arranged above the cylinder rows. In an engine, each of these camshafts is usually driven by a single timing belt.

The drive system for the camshaft of such a V-type engine will now be described. As shown in FIG. 2, the banks 1 and 2 are usually designed in consideration of design requirements, serviceability, and the like. The intake valve drive camshafts 4 and 6 are disposed on the center side of the engine 3, and the exhaust valve drive camshafts 5 and 7 are disposed outside the banks 1 and 2. The cam pulley 8 is attached to one end of each of the cam shafts 4 to 7.
~ 11 are provided respectively, and the engine body 3
A crank pulley (not shown) is provided at one end of the crank shaft of, and one timing belt 12 is attached so as to mesh with each of these pulleys. A required tension is always applied to the timing belt 12 by a belt tensioner (not shown) or the like.

By the way, from immediately before the end of the exhaust stroke of each cylinder to immediately after the start of the intake stroke, there is a so-called overlap in which the intake and exhaust valves are both open. This overlap is a zone in which both the exhaust valve and the intake valve are open, as indicated by the diagonal lines in the cam profile diagram of FIG. Then, at the time of such an overlap, the following forces act on the camshafts 4 to 7. First, on the exhaust valve side, the exhaust valve is rising and being closed due to the urging force of the valve spring. A force acts in the direction of energizing the rotation. on the other hand,
On the intake valve side, the intake valve is descending and opening against the urging force of the valve spring, so that the urging force of the valve spring exerts a force in a direction in which rotation of the camshafts 4, 6 is impeded. .

Therefore, as shown in FIG. 2, a force in the direction opposite to the traveling direction of the timing belt 12 acts on the intake valve side camshafts 4 and 6 at the time of overlap, and the exhaust valve side camshafts 5 and 7 are driven. A force acts in the forward direction of the traveling direction of the timing belt 12. Now, the bank 1 on the rear side with respect to the traveling direction of the timing belt 12 (that is, the bank on the left side in the figure) is the first bank, and the bank on the front side in the traveling direction of the timing belt 12 (ie, the bank on the right side in the figure). ) 2 is the second bank. The intake and exhaust valve camshafts 4 and 5 provided in the first bank 1 are used as a first intake valve driving camshaft and a first exhaust valve driving camshaft, respectively, and are similarly provided to the second bank 2. The camshafts 6 and 7 are the second intake valve driving camshaft and the second exhaust valve driving camshaft.

In this case, when the timing belt 12 operates, the first exhaust valve driving camshaft 5, the first intake valve driving camshaft 4, the second intake valve driving camshaft 6, and the second exhaust valve driving camshaft. Each cam shaft rotates in the order of the shaft 7. In the V-type engine 3 having such a configuration, in the first bank 1, the intake valve driving camshaft 4 is arranged ahead of the exhaust valve driving camshaft 5 in the traveling direction of the timing belt 12. Therefore, at the time of overlap, a force acts on the front side in the traveling direction of the timing belt 12 in a direction that hinders the operation of the timing belt 12, and a force acts on the rear side in the traveling direction in a direction of energizing the operation of the timing belt 12. .

Therefore, when the cylinders of the first bank 1 overlap, the timing belt 12 is loosened, and the phases of the camshafts 4 and 5 of the intake and exhaust valves change as shown by the solid line in FIG. Resulting in. As a result, the exhaust valve closes early and the intake valve opens late, and as shown in FIG. 3, substantial overlap may decrease.

On the other hand, in the second bank 2, the exhaust valve driving camshaft 7 is arranged ahead of the intake valve driving camshaft 6 in the advancing direction of the timing belt. Contrary to the first bank 1, the timing belt 12 is
The force will act in the direction of pulling. Of course, in this case, the intake and exhaust valve drive camshafts 6, 7
The phase of does not change.

When the overlap on the first bank 1 side is reduced as described above, the inflow amount of EGR gas into each cylinder on the first bank 1 side is reduced and the intake air amount is increased to make the air-fuel ratio lean. turn into. For example, the V-type engine 3 shown in FIG. 2 has the first, third, and fifth cylinders on the first bank 1 side and the second, fourth, and sixth cylinders on the second bank 2 side. In the case of the V-type 6-cylinder engine, as shown in the graph of FIG. 4, the intake air amount of each cylinder (No. 1, No. 3, No. 5) on the first bank 1 side is the same despite the same fuel injection amount. , The number of cylinders on the second bank 2 side (No. 2, No. 4, No. 6) increases, and the air-fuel ratio becomes different between the banks 1 and 2.

Further, since the ignition operation is performed in the order of No. 1, No. 2, No. 3, No. 4, No. 5, No. 6 in the normal V-type 6-cylinder engine, the cylinder of the first bank 1 and the second bank. The two cylinders will burn alternately. Therefore, in the V-type engine 3 as described above, as shown in the vibration waveform diagram of FIG. 5B, the combustion fluctuation occurs for each cylinder, and the 1.5th order vibration is generated. Note that FIG.
FIG. 6 is a waveform diagram showing combustion fluctuations when the air-fuel ratio of each cylinder is uniform.

[0011]

As described above, in the V-type engine in which the camshaft of the intake / exhaust valve is driven by one timing belt, the first bank and the second bank have different overlaps. As a result, combustion fluctuations occur between the first and second banks, especially at idle.
There is a problem that the next unpleasant vibration occurs.

By the way, in Japanese Patent Laid-Open No. 1-300009, a V-type engine having first and second cylinder rows is provided with a camshaft for driving intake and exhaust valves above each cylinder row. There is disclosed a technique in which the cylinder row and the second cylinder row are configured such that the phases or profiles of the cam shafts are different from each other so that the intake and exhaust valves can be opened and closed at an appropriate time.

However, the above-described technique is a so-called SOHC type V drive in which the intake valve and the exhaust valve are driven by a single cam shaft provided on each bank.
In this type of V engine, the camshafts are shifted by the same phase, and the relative phase shift between the camshafts is not so large. Therefore, like the V-type engine described above, the first
The overlap amount does not differ between the bank and the second bank, and the above problems cannot be solved.

The present invention was devised in view of the above problems, and it is an object of the present invention to provide a V-type engine capable of suppressing the combustion fluctuation between the left and right banks and particularly reducing the vibration during idling. To aim.

[0015]

Therefore, the V-type engine of the present invention according to claim 1 has a first bank and a second bank, and a first bank disposed on the center side of the engine body of the first bank. Intake valve drive camshaft, second intake valve drive camshaft arranged on the center side of the engine body of the second bank, and first exhaust valve drive arranged outside the engine body of the first bank Camshaft, a second exhaust valve driving camshaft arranged outside the engine body of the second bank, and a first exhaust valve driving camshaft for driving all of these camshafts, A first intake valve driving camshaft, the second intake valve driving camshaft,
In a V-type engine having a single timing belt that rotates in a rotation direction such that the second exhaust valve driving camshaft advances in order, the first intake valve according to the looseness of the timing belt during driving. In order to correct the deviation of the opening timing of the drive cam shaft, the rotational phase of the first intake valve drive cam shaft is corrected in advance, and the first exhaust valve drive cam corresponding to the looseness of the timing belt during driving is corrected. It is characterized in that the rotation phase of the first exhaust valve driving cam shaft is retarded in order to correct the shift in the closing timing of the shaft.

A V-type engine according to a second aspect of the present invention includes a first bank and a second bank, and a first intake valve driving camshaft arranged on the center side of the engine body of the first bank. A second intake valve driving camshaft arranged on the center side of the engine body of the second bank; a first exhaust valve driving camshaft arranged outside the engine body of the first bank; A second exhaust valve driving camshaft disposed outside the engine body of the two banks, and the first exhaust valve driving camshaft and the first intake valve driving camshaft for driving all of these camshafts. A V-type engine having a shaft, a second intake valve driving camshaft, and a single timing belt rotating in a rotational direction such that the second exhaust valve driving camshaft advances in this order. Thailand Said according to the loosening of Nguberuto 1
In order to correct the deviation of the opening timing of the intake valve driving camshaft, the rotation phase of the first intake valve driving camshaft is advanced and corrected.

A V-type engine according to a third aspect of the present invention includes a first bank and a second bank, and a first intake valve driving camshaft arranged on the center side of the engine body of the first bank. A second intake valve driving camshaft arranged on the center side of the engine body of the second bank; a first exhaust valve driving camshaft arranged outside the engine body of the first bank; A second exhaust valve driving camshaft disposed outside the engine body of the two banks, and the first exhaust valve driving camshaft and the first intake valve driving camshaft for driving all of these camshafts. A V-type engine having a shaft, a second intake valve driving camshaft, and a single timing belt rotating in a rotational direction such that the second exhaust valve driving camshaft advances in this order. Thailand Said according to the loosening of Nguberuto 1
It is characterized in that the rotational phase of the first exhaust valve driving camshaft is retarded in order to correct the deviation of the closing timing of the exhaust valve driving camshaft.

According to a fourth aspect of the present invention, there is provided a V-type engine including a first bank and a second bank, and a first intake valve driving camshaft arranged on the center side of the engine body of the first bank. A second intake valve driving camshaft arranged on the center side of the engine body of the second bank; a first exhaust valve driving camshaft arranged outside the engine body of the first bank; A second exhaust valve driving camshaft disposed outside the engine body of the two banks, and the first exhaust valve driving camshaft and the first intake valve driving camshaft for driving all of these camshafts. A V-type engine having a shaft, the second intake valve driving camshaft, and a single timing belt rotating in a rotational direction such that the second exhaust valve driving camshaft advances in this order. To The rotational phase of the second intake valve driving camshaft is retarded according to the looseness of the timing belt, and the second exhaust valve driving cam is responded to by the looseness of the timing belt on the first bank side. The shaft is characterized in that the rotation phase of the shaft is corrected in advance.

According to a fifth aspect of the present invention, there is provided a V-type engine including a first bank and a second bank, and a first intake valve driving camshaft arranged on the center side of the engine body of the first bank. A second intake valve driving camshaft arranged on the center side of the engine body of the second bank; a first exhaust valve driving camshaft arranged outside the engine body of the first bank; A second exhaust valve driving camshaft disposed outside the engine body of the two banks, and the first exhaust valve driving camshaft and the first intake valve driving camshaft for driving all of these camshafts. A V-type engine having a shaft, the second intake valve driving camshaft, and a single timing belt rotating in a rotational direction such that the second exhaust valve driving camshaft advances in this order. To Jill according to loosening of the timing belt, is characterized in that the rotational phase of the second intake valve drive cam shaft is retard correction.

According to a sixth aspect of the present invention, there is provided a V-type engine including a first bank and a second bank, and a first intake valve driving camshaft arranged on the center side of the engine body of the first bank. A second intake valve driving camshaft arranged on the center side of the engine body of the second bank; a first exhaust valve driving camshaft arranged outside the engine body of the first bank; A second exhaust valve driving camshaft disposed outside the engine body of the two banks, and the first exhaust valve driving camshaft and the first intake valve driving camshaft for driving all of these camshafts. A V-type engine having a shaft, the second intake valve driving camshaft, and a single timing belt rotating in a rotational direction such that the second exhaust valve driving camshaft advances in this order. To Jill according to loosening of the timing belt, is characterized in that the rotational phase of the second exhaust valve drive cam shaft is corrected advance.

According to the V-type engine of the present invention described in claim 7, in addition to the structure of any one of claims 1 to 6, the intake valve is opened before the exhaust valve is closed. It is characterized in that the exhaust valve and the intake valve are opened so as to overlap each other.

[0022]

According to the V-type engine of the present invention as set forth in claim 1, the first exhaust valve driving camshaft and the first bank of the first bank, which are arranged outside the engine body of the first bank, are provided by one timing belt. First intake valve driving camshaft arranged on the center side of the engine body, second intake valve driving camshaft arranged on the center side of the engine body of the second bank, arranged outside the engine body of the second bank The second done
Each cam shaft rotates in a rotation direction such that the exhaust valve driving cam shaft advances in this order. Here, the rotational phase of the first intake valve driving camshaft is corrected by the advance angle according to the looseness of the timing belt at the time of driving, which causes the deviation of the opening timing of the first intake valve driving camshaft. Will be corrected. In addition, the rotational phase of the first exhaust valve driving camshaft is also corrected by the retard angle corresponding to the looseness of the timing belt during driving, and the deviation of the closing timing of the first exhaust valve driving camshaft is corrected. To be done. Therefore, the overlap between the first bank and the second bank does not differ, combustion fluctuation is suppressed, and vibration during idling is reduced.

In the V-type engine according to the second aspect of the present invention, the first exhaust valve driving camshaft and the first bank of the first bank, which are arranged outside the engine body of the first bank, are provided by the single timing belt. First intake valve driving camshaft arranged on the center side of the engine body, second intake valve driving camshaft arranged on the center side of the engine body of the second bank, arranged outside the engine body of the second bank The respective camshafts rotate in such rotation directions as to advance in the order of the second exhaust valve driving camshafts. Here, the rotational phase of the first intake valve driving camshaft is corrected by the advance angle according to the looseness of the timing belt during driving, which delays the opening timing of the first intake valve driving camshaft. However, this deviation is corrected. Therefore, the first
Combustion fluctuations are suppressed between the bank and the second bank, and vibration during idling is reduced.

In the V-type engine according to the third aspect of the present invention, the first exhaust valve driving camshaft and the first bank of the first bank, which are arranged outside the engine body of the first bank, are provided by the single timing belt. First intake valve driving camshaft arranged on the center side of the engine body, second intake valve driving camshaft arranged on the center side of the engine body of the second bank, arranged outside the engine body of the second bank The respective camshafts rotate in such rotation directions as to advance in the order of the second exhaust valve driving camshafts. Here, the rotational phase of the first exhaust valve driving camshaft is retarded by an amount corresponding to the looseness of the timing belt at the time of driving, whereby the closing timing of the first exhaust valve driving camshaft is advanced. However, this deviation is corrected. Therefore, combustion fluctuation is suppressed between the first bank and the second bank, and vibration during idling is reduced.

In the V-type engine of the present invention as set forth in claim 4, the first exhaust valve driving camshaft and the first bank of the first bank, which are arranged outside the engine body of the first bank, are provided by a single timing belt. First intake valve driving camshaft arranged on the center side of the engine body, second intake valve driving camshaft arranged on the center side of the engine body of the second bank, arranged outside the engine body of the second bank The respective camshafts rotate in such rotation directions as to advance in the order of the second exhaust valve driving camshafts.

The rotational phase of the second intake valve driving camshaft is retarded by an amount corresponding to the looseness of the timing belt generated on the first bank side.
Even if the opening timing of the first intake valve driving camshaft is delayed, this deviation is corrected on the second intake valve driving camshaft side. Further, the rotational phase of the second exhaust valve driving camshaft is corrected in advance by an amount corresponding to the looseness of the timing belt generated on the first bank side, and thereby the closing timing of the first exhaust valve driving camshaft. Even if the speed increases, the deviation is corrected on the side of the second exhaust valve driving camshaft. Therefore, the overlap between the first bank and the second bank does not differ, combustion fluctuation is suppressed, and vibration during idling is reduced.

In the V-type engine according to the fifth aspect of the present invention, the first exhaust valve driving camshaft and the first bank of the first bank, which are arranged outside the engine body of the first bank, are provided by the single timing belt. First intake valve driving camshaft arranged on the center side of the engine body, second intake valve driving camshaft arranged on the center side of the engine body of the second bank, arranged outside the engine body of the second bank The respective camshafts rotate in such rotation directions as to advance in the order of the second exhaust valve driving camshafts.

The rotational phase of the second intake valve driving camshaft is retarded by an amount corresponding to the looseness of the timing belt generated on the first bank side, whereby the first intake valve driving camshaft is retarded. Even if the opening timing is delayed, the deviation is corrected on the side of the second intake valve driving camshaft. Therefore, the combustion fluctuation is suppressed between the first bank and the second bank, and the vibration during idling is reduced.

In the V-type engine of the present invention as set forth in claim 6 above, the first exhaust valve driving cam shaft and the first bank of the first bank, which are arranged outside the engine body of the first bank, are provided by one timing belt. First intake valve driving camshaft arranged on the center side of the engine body, second intake valve driving camshaft arranged on the center side of the engine body of the second bank, arranged outside the engine body of the second bank The respective camshafts rotate in such rotation directions as to advance in the order of the second exhaust valve driving camshafts. Then, by the amount corresponding to the looseness of the timing belt occurring on the first bank side,
The rotation phase of the second exhaust valve driving camshaft is corrected in advance, so that even if the closing timing of the first exhaust valve driving camshaft is advanced, this deviation will occur on the second exhaust valve driving camshaft side. Will be corrected. Therefore, the combustion fluctuation is suppressed between the first bank and the second bank, and the vibration during idling is reduced.

In the V-type engine of the present invention as set forth in claim 7, the exhaust valve and the intake valve are opened so that the intake valve is opened before the exhaust valve is closed, so that the intake air flows in. Along with this, the discharge of burned gas is promoted, and the intake and exhaust efficiency is improved.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A V-type engine as an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cam profile diagram for explaining the essential parts thereof. First, the V-type engine of the present invention is a DOHC-type V-type engine in which camshafts for driving intake and exhaust valves are arranged above the respective cylinder rows, and each of these camshafts has a single timing. It is designed to be driven by a belt.

That is, the conventional V as shown in FIG.
As in the case of the engine of each type, the intake valve driving camshafts 4 and 6 are arranged on the center side of the engine 3 of each bank 1 and 2, and the exhaust valve driving camshafts 5 and 7 are arranged outside the banks 1 and 2.
Is provided. Also, these camshafts 4-7
Cam pulleys 8 to 11 are provided at one end of each of the crankshafts, and a crank pulley is provided at one end of the crankshaft of the engine body 3, and one timing belt is engaged with each of these pulleys. 12 is attached. In addition, this timing belt 12
The belt tensioner (not shown) or the like always applies a required tension to the belt.

Here, the following forces act on the camshafts 4 to 7 when the valves of the cylinders overlap each other. That is, on the exhaust valve side, the exhaust valve rises in accordance with the urging force of the valve spring and is closing, so that the camshafts 4, 6 from the upper end of the valve stem.
A force acts in the direction of urging the rotation of the cam shafts 4 and 6 along the cam lobe. On the other hand, on the intake valve side, since the intake valve is descending and opening against the biasing force of the valve spring, the biasing force of the valve spring acts to prevent rotation of the camshafts 5, 7. is there.

Therefore, as shown in FIG. 2, a force in the direction opposite to the traveling direction of the timing belt 12 acts on the intake valve side camshafts 4 and 6 at the time of overlap, and the exhaust valve side camshafts 5 and 7 are driven. A force acts in the forward direction of the traveling direction of the timing belt 12. In the V-type engine 3 having such a configuration, the timing belt 12
In the first bank 1 located on the rear side with respect to the advancing direction of, the intake valve driving camshaft 4 is arranged ahead of the exhaust valve driving camshaft 5 in the advancing direction of the timing belt 12. Therefore, at the time of overlap, a force acts on the front side in the traveling direction of the timing belt 12 in a direction that hinders the operation of the timing belt 12, and a force acts on the rear side in the traveling direction in a direction of energizing the operation of the timing belt 12.

As a result, when the cylinders of the first bank 1 overlap, the timing belt 12 is loosened, and the phases of the camshafts 4 and 5 of the first bank 1 change. Therefore, in the V-type engine of the present invention,
In order to correct the phase shifts of the camshafts 4 and 5 of the first bank 1, the rotational phase of the first intake valve driving camshaft 4 is advanced by a predetermined angle in advance, as indicated by the thick line in FIG. It is corrected and arranged. Similarly, the first exhaust valve driving camshaft 5 is also provided with the rotational phase retarded in advance by a predetermined angle.

As a result, at the design value (when the timing belt does not loosen), the opening and closing timing of the intake valve is delayed and the opening and closing timing of the exhaust valve is delayed on the first bank 1 side, and the first bank 1 side is delayed. The overlap time becomes longer. That is, the cylinders on the first bank 1 side and the cylinders on the second bank 2 side have different overlaps. However, in the actual state of the engine 3 (when the timing belt is loosened), as described above, the timing belt 1 is provided on the first bank 1 side when the cylinders overlap each other.
Since the looseness occurs in 2, the overlap is reduced by this amount, so by correcting the opening / closing timing of the intake / exhaust valve in advance,
The overlap between the first bank 1 side and the second bank 2 side is equal.

The advance correction amount and the retard correction amount of the first intake valve driving camshaft 4 and the first exhaust valve driving camshaft 5 are about half of the phase difference caused by the loosening of the timing belt 12. Has become. That is, due to the looseness of the timing belt 12, the overlap is 5 deg.
If it is reduced to some extent, the camshaft 4 shown in FIG.
The advanced angle correction amount (advanced angle adjustment amount) and the retarded angle correction amount (delayed angle adjustment amount) of 5 may both be set to 2.5 deg.

The thick line shown in FIG. 1 is a cam profile of a design value indicating the advance correction amount and the retard correction amount of the camshafts 4, 5 on the first bank 1 side. The thin line inside is the actual cam profile. The thin-line cam profile also shows the cam profile on the second bank 2 side. Further, the hatched portion shown in FIG. 1 indicates a substantial overlap of each cylinder in the first bank 1 and the second bank 2.

Since the V-type engine as one embodiment of the present invention is configured as described above, the rotational phase of the first intake valve driving camshaft 4 is preliminarily corrected by a predetermined angle, and By previously correcting the rotational phase of the first exhaust valve driving camshaft 5 by a predetermined angle, the overlap between the first bank 1 side and the second bank 2 side during the operation of the engine 3 can be prevented. Can be equal.

As a result, the vibration waveform of the V-type engine 3 can be made the vibration waveform of an engine corresponding to in-line 6 cylinders with almost no combustion fluctuation as shown in FIG. It becomes possible to suppress the combustion fluctuation during the period. That is, the first bank 1 and the second bank
By making the overlap with the bank 2 equal, the combustion states of the cylinders in the banks 1 and 2 can be made substantially uniform, and the ignition order is the same as that of the first bank 1 and the second bank 2.
Even in the engine 3 that is alternately performed with the bank 2, it is possible to suppress the combustion fluctuation between the banks 1 and 2.

Therefore, there is an advantage that the 1.5th order vibration during idling can be suppressed and the discomfort of a driver or an occupant can be eliminated. In addition,
In the present embodiment, the rotational phases of both the intake valve driving camshaft 4 and the exhaust valve driving camshaft 5 of the first bank 1 are advanced and retarded, but, for example, the first The advance angle may be corrected only for the rotational phase of the intake valve driving camshaft 4. Further, similarly to this, only the rotational phase of the first exhaust valve driving camshaft 5 may be retarded.

According to such a structure, there is an advantage that it is possible to surely reduce the combustion fluctuation at the time of idling of the V-type engine at a low cost. Further, in the present embodiment, the phase of the camshaft on the first bank 1 side is corrected in accordance with the valve opening / closing timing of the second bank 2.
The present invention is not limited to such a configuration, and for example, the phase of the camshaft on the second bank 2 side may be corrected to match the valve opening / closing timing of the first bank 1.

Specifically, the rotational phase of the second intake valve driving camshaft 6 is retarded in accordance with the looseness of the timing belt 12 on the first bank 1 side, and the first bank 1 is also corrected. The rotational phase of the second exhaust valve driving camshaft 7 is corrected in advance according to the looseness of the timing belt 12 generated on the side. With such a configuration, there is an advantage that the same effect as that of the above-described embodiment can be obtained.

Alternatively, only the rotational phase of the second intake valve driving camshaft 6 may be retarded according to the looseness of the timing belt 12 on the first bank 1 side. Further, only the rotational phase of the second exhaust valve driving camshaft 7 is generated on the first bank 1 side in the timing belt 1
The advance angle may be corrected according to the looseness of 2. Further, according to such a configuration, there is an advantage that the combustion fluctuation at the time of idling of the V-type engine can be surely reduced at low cost.

[0045]

As described in detail above, according to the V-type engine of the present invention as set forth in claim 1, the first bank and the second bank are arranged on the center side of the engine body of the first bank. A first intake valve driving camshaft, a second intake valve driving camshaft arranged on the center side of the engine body of the second bank, and a first exhaust gas arranged outside the engine body of the first bank. A valve driving camshaft, a second exhaust valve driving camshaft arranged outside the engine body of the second bank, and a first exhaust valve driving camshaft for driving all of these camshafts. A camshaft for driving the first intake valve, a camshaft for driving the second intake valve,
In a V-type engine having a single timing belt that rotates in a rotation direction such that the second exhaust valve driving camshaft advances in order, the first intake valve according to the looseness of the timing belt during driving. In order to correct the deviation of the opening timing of the drive cam shaft, the rotational phase of the first intake valve drive cam shaft is corrected in advance, and the first exhaust valve drive cam corresponding to the looseness of the timing belt during driving is corrected. In order to correct the shift in the closing timing of the shaft, the rotational phase of the first exhaust valve driving camshaft is corrected in the retard angle, so that the shift in the overlap between the first bank and the second bank is corrected. Therefore, there is an advantage that the combustion fluctuation is suppressed and the vibration during idling, especially the 1.5th order vibration can be reduced.

According to the V-type engine of the present invention, the first bank and the second bank, and the first intake valve driving cam arranged on the center side of the engine body of the first bank. A shaft, a second intake valve driving camshaft arranged on the center side of the engine body of the second bank, and a first exhaust valve driving camshaft arranged outside the engine body of the first bank, A second exhaust valve driving camshaft arranged outside the engine body of the second bank, and a first exhaust valve driving camshaft and a first intake valve driving camshaft for driving all of these camshafts. V-type engine having a timing belt that rotates in a rotational direction such that the driving camshaft, the second intake valve driving camshaft, and the second exhaust valve driving camshaft move in this order of At a low cost, the rotational phase of the first intake valve driving camshaft is advanced to correct the opening timing deviation of the first intake valve driving camshaft according to the looseness of the timing belt. There is an advantage that the combustion fluctuation at the time of idling of the V-type engine can be surely reduced.

According to the V-type engine of the present invention as defined in claim 3, the first bank and the second bank, and the first intake valve driving cam arranged on the center side of the engine body of the first bank. A shaft, a second intake valve driving camshaft arranged on the center side of the engine body of the second bank, and a first exhaust valve driving camshaft arranged outside the engine body of the first bank, A second exhaust valve driving camshaft arranged outside the engine body of the second bank, and a first exhaust valve driving camshaft and a first intake valve driving camshaft for driving all of these camshafts. V-type engine having a timing belt that rotates in a rotational direction such that the driving camshaft, the second intake valve driving camshaft, and the second exhaust valve driving camshaft move in this order of Due to the configuration in which the rotation phase of the first exhaust valve driving camshaft is retarded in order to correct the shift of the closing timing of the first exhaust valve driving camshaft according to the looseness of the timing belt, the low phase is also maintained. There is an advantage that the combustion fluctuation at the time of idling of the V-type engine can be reliably reduced at a cost.

According to the V-type engine of the present invention, the first bank and the second bank, and the first intake valve driving cam arranged on the center side of the engine body of the first bank. A shaft, a second intake valve driving camshaft arranged on the center side of the engine body of the second bank, and a first exhaust valve driving camshaft arranged outside the engine body of the first bank, A second exhaust valve driving camshaft arranged outside the engine body of the second bank, and a first exhaust valve driving camshaft and a first intake valve driving camshaft for driving all of these camshafts. A V-type engine having a timing cam that rotates in a rotational direction such that the driving camshaft, the second intake valve driving camshaft, and the second exhaust valve driving camshaft move in this order. Van The rotational phase of the second intake valve driving camshaft is retarded according to the looseness of the timing belt generated on the side of the first exhaust valve, and the second exhaust valve driving unit is driven according to the looseness of the timing belt on the side of the first bank. With the configuration in which the rotational phase of the camshaft is corrected for the advance angle, it is possible to correct the deviation of the overlap between the first bank and the second bank, suppress the combustion fluctuation, and suppress the vibration during idling, especially 1 There is an advantage that the fifth-order vibration can be reduced.

According to the V-type engine of the present invention as defined in claim 5, the first bank and the second bank, and the first intake valve driving cam arranged on the center side of the engine body of the first bank. A shaft, a second intake valve driving camshaft arranged on the center side of the engine body of the second bank, and a first exhaust valve driving camshaft arranged outside the engine body of the first bank, A second exhaust valve driving camshaft arranged outside the engine body of the second bank, and a first exhaust valve driving camshaft and a first intake valve driving camshaft for driving all of these camshafts. A V-type engine having a timing cam that rotates in a rotational direction such that the driving camshaft, the second intake valve driving camshaft, and the second exhaust valve driving camshaft move in this order. Van By the configuration in which the rotational phase of the second intake valve driving camshaft is retarded according to the looseness of the timing belt generated on the side, combustion fluctuation during idling of the V-type engine can be reliably reduced at low cost. There is an advantage that you can.

According to the V-type engine of the present invention as defined in claim 6, the first bank and the second bank, and the first intake valve driving cam arranged on the center side of the engine body of the first bank. A shaft, a second intake valve driving camshaft arranged on the center side of the engine body of the second bank, and a first exhaust valve driving camshaft arranged outside the engine body of the first bank, A second exhaust valve driving camshaft arranged outside the engine body of the second bank, and a first exhaust valve driving camshaft and a first intake valve driving camshaft for driving all of these camshafts. A V-type engine having a timing cam that rotates in a rotational direction such that the driving camshaft, the second intake valve driving camshaft, and the second exhaust valve driving camshaft move in this order. Van By the configuration in which the rotational phase of the second exhaust valve driving cam shaft is corrected in advance according to the looseness of the timing belt generated on the side, the combustion fluctuation at the time of idling of the V-type engine can be surely achieved at low cost. There is an advantage that it can be reduced.

According to the V-type engine of the present invention described in claim 7, in addition to the structure of any one of claims 1 to 6, the intake valve is opened before the exhaust valve is closed. With the configuration in which the exhaust valve and the intake valve are opened so as to overlap with each other, the discharge of the burned gas is promoted with the inflow of intake air, and the intake and exhaust efficiency is improved.

[Brief description of drawings]

FIG. 1 is a cam profile diagram for explaining a main part of a V-type engine as one embodiment of the present invention.

FIG. 2 is a schematic diagram showing a drive system of an intake / exhaust valve of a V-type engine.

FIG. 3 is a cam profile diagram for explaining opening and closing timings of intake and exhaust valves of a conventional V-type engine.

FIG. 4 is a graph showing an intake air amount for each cylinder of a conventional V-6 cylinder engine.

5A and 5B are graphs for explaining combustion fluctuation of a 6-cylinder engine, in which FIG. 5A is a graph showing a vibration waveform of the 6-cylinder engine when there is almost no combustion fluctuation, and FIG. 6 is a graph showing a vibration waveform of a V-type 6-cylinder engine in which a camshaft of an intake / exhaust valve is driven by a timing belt.

[Explanation of symbols]

 1 1st bank 2 2nd bank 3 V type engine main body 4 1st intake valve drive camshaft 5 1st exhaust valve drive camshaft 6 2nd intake valve drive camshaft 7 3rd exhaust valve drive camshaft 8 ~ 11 Cam pulley 12 Timing belt

Claims (7)

[Claims] 1. A first bank and a second bank, and a first bank disposed on a center side of an engine body of the first bank.
A camshaft for driving the intake valve, and a second shaft arranged on the center side of the engine body of the second bank.
Intake valve driving camshaft, first exhaust valve driving camshaft arranged outside the first bank engine body, and second exhaust valve driving camshaft arranged outside the second bank engine body A camshaft and a camshaft for driving the first exhaust valve, a camshaft for driving the first intake valve, a camshaft for driving the second intake valve, and a second exhaust valve for driving all of these camshafts. In a V-type engine having one timing belt that rotates in a rotation direction such that the driving camshaft advances in order, in the first intake valve driving camshaft according to the looseness of the timing belt during driving, In order to correct the deviation of the opening timing, the rotation phase of the first intake valve driving cam shaft is advanced, and the first exhaust valve driving cam corresponding to the looseness of the timing belt during driving is corrected. In order to correct the deviation of the closing timing of Yafuto, characterized in that the rotational phase of the first exhaust valve drive cam shaft is retard correction, V-type engine. 2. A first bank and a second bank, and a first bank disposed on the center side of the engine body of the first bank.
A camshaft for driving the intake valve, and a second shaft arranged on the center side of the engine body of the second bank.
Intake valve driving camshaft, first exhaust valve driving camshaft arranged outside the first bank engine body, and second exhaust valve driving camshaft arranged outside the second bank engine body A camshaft and a camshaft for driving the first exhaust valve, a camshaft for driving the first intake valve, a camshaft for driving the second intake valve, and a second exhaust valve for driving all of these camshafts. In a V-type engine having one timing belt that rotates in a rotation direction such that the driving camshaft advances in order, in the first intake valve driving camshaft according to the looseness of the timing belt during driving, A V-type engine characterized in that a rotation phase of a camshaft for driving a first intake valve is corrected in advance so as to correct a shift in opening timing. 3. A first bank and a second bank, and a first bank disposed on the center side of the engine body of the first bank.
A camshaft for driving the intake valve, and a second shaft arranged on the center side of the engine body of the second bank.
Intake valve driving camshaft, first exhaust valve driving camshaft arranged outside the first bank engine body, and second exhaust valve driving camshaft arranged outside the second bank engine body A camshaft and a camshaft for driving the first exhaust valve, a camshaft for driving the first intake valve, a camshaft for driving the second intake valve, and a second exhaust valve for driving all of these camshafts. In a V-type engine having one timing belt that rotates in a rotation direction such that the driving camshaft advances in order, in the first exhaust valve driving camshaft according to the looseness of the timing belt during driving, A V-type engine characterized in that the rotational phase of the first exhaust valve driving camshaft is retarded in order to correct the deviation of the closing timing. 4. A first bank and a second bank, and a first bank disposed on the center side of the engine body of the first bank.
A camshaft for driving the intake valve, and a second shaft arranged on the center side of the engine body of the second bank.
Intake valve driving camshaft, first exhaust valve driving camshaft arranged outside the first bank engine body, and second exhaust valve driving camshaft arranged outside the second bank engine body A camshaft and a camshaft for driving the first exhaust valve, a camshaft for driving the first intake valve, a camshaft for driving the second intake valve, and a second exhaust valve for driving all of these camshafts. In a V-type engine having a single timing belt that rotates in a rotational direction that advances in order of a driving camshaft, a second intake valve drive is provided according to the looseness of the timing belt that occurs on the first bank side. The rotational phase of the camshaft is retarded, and the rotational phase of the second exhaust valve driving camshaft is advanced according to the looseness of the timing belt on the first bank side. And wherein, V-type engine. 5. A first bank and a second bank, and a first bank disposed on the center side of the engine body of the first bank.
A camshaft for driving the intake valve, and a second shaft arranged on the center side of the engine body of the second bank.
Intake valve driving camshaft, first exhaust valve driving camshaft arranged outside the first bank engine body, and second exhaust valve driving camshaft arranged outside the second bank engine body A camshaft and a camshaft for driving the first exhaust valve, a camshaft for driving the first intake valve, a camshaft for driving the second intake valve, and a second exhaust valve for driving all of these camshafts. In a V-type engine having a single timing belt that rotates in a rotational direction that advances in order of a driving camshaft, a second intake valve drive is provided according to the looseness of the timing belt that occurs on the first bank side. A V-type engine characterized in that the rotational phase of the camshaft is retarded. 6. A first bank and a second bank, and a first bank disposed on the center side of the engine body of the first bank.
A camshaft for driving the intake valve, and a second shaft arranged on the center side of the engine body of the second bank.
Intake valve driving camshaft, first exhaust valve driving camshaft arranged outside the first bank engine body, and second exhaust valve driving camshaft arranged outside the second bank engine body A camshaft and a camshaft for driving the first exhaust valve, a camshaft for driving the first intake valve, a camshaft for driving the second intake valve, and a second exhaust valve for driving all of these camshafts. In a V-type engine having a single timing belt that rotates in a rotation direction such that the driving camshaft advances in order, a second exhaust valve driving unit is driven according to the looseness of the timing belt that occurs on the first bank side. A V-type engine characterized in that the rotation phase of the camshaft is corrected in advance. 7. The exhaust valve and the intake valve are configured so that the intake valve is opened before the exhaust valve is closed so that the exhaust valve and the intake valve are opened.
V type engine in any one of -6.