JPH05272354A - Internal combustion engine - Google Patents

Abstract

PURPOSE:To improve the cooling efficiency of cooling water and the output performance of an internal combustion engine, in which a unit injector and a cam shaft are installed near a cylinder head, by installing a sub radiator in a space on one side of a cylinder block. CONSTITUTION:This internal combustion engine is provided with a unit injector V and a cam shaft 5 disposed respectively near a cylinder head 16. A sub radiator 1 is installed in a space on one side of a cylinder block 8. A sub radiator fan 2 which supplies air to the sub radiator 1 is driven by a crank shaft 20, and a sub radiator cooling water pump 9 is driven by the fan shaft 2a of the sub radiator fan 2. Besides, the discharged water from the sub radiator cooling water pump 9 is made to pass through the air intake cooler 36 of the internal combution engine It is thus possible to cool cooling water with the sub radiator fan 1 more than cooling by a main radiator fan, improving cooling efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for improving the structure of an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, a technique in which a unit injector is arranged in the vicinity of a cylinder head in an internal combustion engine has been publicly known. For example, JP-A-58-20496
2 and the technique described in JP-A-59-27872.

[0003]

SUMMARY OF THE INVENTION According to the present invention, when the unit injector and the cam shaft are arranged near or above the cylinder head above the internal combustion engine as in the prior art, a fuel pump or a conventional fuel pump has been used. A position on one side of the cylinder block where the cam shaft was disposed becomes an extra space, and the portion becomes empty. Therefore, another device for improving the performance of the internal combustion engine is attached to the portion. ..

Further, when the camshaft is arranged above the cylinder head, the timing drive from the crankshaft to the camshaft cannot be transmitted by the gear because of the long distance, as in the conventional case. It is driven by the timing drive chain. However, as the timing drive chain becomes longer, the chain pins wear more and more, and the timing shift becomes a problem.
This point of the present invention is improved by interposing a speed increasing mechanism therebetween.

[0005]

The problems to be solved by the present invention are as described above, and the means for solving the problems will be described below. That is, in the internal combustion engine in which the unit injector U and the cam shaft 5 are arranged in the vicinity of the cylinder head 16, the sub radiator 1 is placed in the space on one side of the cylinder block 8.
Was placed.

Further, the sub radiator fan 2 for supplying the cooling air to the sub radiator 1 is driven by the crank shaft 20, and the fan shaft 2a of the sub radiator fan 2 drives the sub radiator cooling water pump 9. ..

Further, the discharge water from the sub radiator cooling water pump 9 is passed through the intake intercooler 36 of the internal combustion engine.

Further, the unit injector U and the cam shaft 5
In the internal combustion engine in which the crankshaft 20 and the camshaft 5 are arranged in the vicinity of the cylinder head 16, the timing drive chain 24 is wound between the crankshaft 20 and the camshaft 5, and the counter is provided between the crankshaft 20 and the camshaft 5. The reduction gear ratio by the timing drive chain 24 is made larger than 1: 2 by interposing the speed increasing mechanism.

Further, the cylinder block 8 and the oil pan 4
In the structure in which the ladder frame 3 is interposed between the cylinder block 8 and the ladder frame 3 to support the bearing portion of the crankshaft 20 between the cylinder block 8 and the ladder frame 3, the vibration isolating rubber support 3a is integrally formed on the ladder frame 3. It was attached.

[0010]

[Operation] Next, the operation will be described. In the present invention, the cam shaft 5 is arranged above the cylinder head 16, and the rotation from the crank shaft 20 is transmitted to the cam shaft 5 by the timing drive chain 24. A fuel pump 6 is driven by the cam shaft 5 and fuel is injected from a fuel injection valve 7. The sub-radiator 1 is arranged in a space on the side of the cylinder block 8 formed by the cam shaft 5 moving to the cylinder head 16. The sub radiator 1 cools a part of the cooling water in the cylinder block 8 and also cools the intake air of the intercooler 36.

[0011]

EXAMPLES Next, examples will be described. 1 is a front sectional view of an internal combustion engine in which a sub radiator 1 is arranged on a side of a cylinder block 8, and FIG. 2 is a side sectional view of the internal combustion engine of FIG.
Is a plan cross-sectional view of the sub radiator 1 and the sub radiator fan 2 of the internal combustion engine of FIG. 1, FIG. 4 is a side cross sectional view showing the sub radiator fan 2, the main radiator fan 37, and the sub radiator fan 2, and FIG. A turbo fan 32 is provided on the exhaust side of the internal combustion engine, an intercooler 36 is attached on the intake side, and cooling water from the sub radiator cooling water pump 9 is guided to the intercooler 36. Fan 32 and compressed air guide tube 33
7 is a front view of FIG. 7, in which the vibration-proof rubber support 3a is attached to the ladder frame 3.
It is an enlarged front view of the structure which provided.

FIG. 8 is a front sectional view showing another embodiment of the vibration-proof rubber support 3a, and FIG. 9 is a drive-side sprocket 23 of the crankshaft 20 to a driven-side sprocket 4 of the camshaft 5.
9 is a front sectional view of a structure in which power is directly transmitted to the drive shaft 9 by the timing drive chain 24. FIG. 10 shows that power is transmitted from the drive side sprocket 23 to the counter sprocket 22 by the timing drive chain 24, and the cam shaft 5 and the counter sprocket 22 are FIG. 11 is a front sectional view of an embodiment in which a speed increasing mechanism is interposed between the driving side sprocket 23 and the driven side sprocket 49. FIG. FIG. 13 is a side sectional view showing a structure in which a speed increasing mechanism is interposed between the sprocket 23 and the cam shaft drive gear 19, and FIG.

This will be described with reference to FIGS. 1, 2 and 3. The internal combustion engine of this embodiment is a diesel engine.
The structure of the internal combustion engine in which the sub radiator 1 is arranged on the right side of the cylinder block 8 will be described. In the conventional internal combustion engine in which the fuel pump and the fuel injection valve are separate bodies, the fuel pump is arranged on the right side portion of the cylinder block 8. Therefore, it was not possible to place another device on the part. In the present invention,
The fuel pump 6 and the fuel injection valve 7 are configured as a unit injector U arranged above the cylinder head 16, and the cam shaft 5 that drives the fuel pump 6 is also supported by the cylinder head 16. Therefore, the right side portion of the cylinder block 8 becomes an empty space, and it becomes possible to arrange the sub radiator 1, the sub radiator fan 2, the fan shaft 2a, and the like in this portion.

In the diesel engine of this embodiment, an oil pan 4 is arranged at the lower end, and the oil pan 4 is fixed to the lower surface of the ladder frame 3. The cylinder block 8 is arranged on the ladder frame 3, and the cylinder head 16 is placed on the cylinder block 8 to
The head cover 17 is placed on the upper part of the. See also FIG.
In the embodiment shown in FIGS. 2 and 3, the cylinder head 16
An air cleaner 14 is arranged on the left side of the cylinder head 16, and an exhaust muffler 15 is arranged on the right side of the cylinder head 16.
Further, an alternator 12 and a starter motor 46 are arranged on the left side of the cylinder block 8, and anti-vibration support rubbers 11 and 13 are supported on the left and right of the ladder frame 3 by anti-vibration rubber supports 3a.

A side sectional view will be described with reference to FIG. A drive side sprocket 23 is arranged at the front end of the crankshaft 20, and the driven side sprocket 49 can be driven by the timing drive chain 24. The ratio of the drive side sprocket 23 and the driven side sprocket 49 is 1: 2.
Is. Further, a fan drive pulley 48 is arranged at the tip of the crankshaft 20, and the fan drive pulley 48 transmits power to a driven pulley 2b provided on the fan shaft 2a of the sub radiator fan 2. Guide cylinders 18 and 40 are provided around the sub radiator fan 2.
A flywheel 21 is fixed to the rear end of the crankshaft 20.

Next, a description will be given with reference to FIGS. At the tip of the crankshaft 20, in addition to the fan drive pulley 48, the fan drive pulley 4 that drives the main radiator fan 37.
7 is fixed, and drives a main radiator fan 37 that blows cooling air to the main radiator 38.
A sub radiator cooling water pump 9 is attached to the fan shaft 2a that drives the sub radiator fan 2, and the cooling water inside the cylinder block 8 is sucked by the sub radiator cooling water pump 9 so that the inside of the sub radiator 1 is sucked. And is cooled by the cooling air from the sub radiator fan 2.

Next, the construction with the intercooler 36 attached will be described with reference to FIGS. 5 and 6. 5 and 6, the position of the sub radiator 1 and the intercooler 3 are shown.
In order to make the positions of 6 coincide with each other, the intake and exhaust positions of the cylinder head 16 are reversed left and right as compared with the case of the embodiment of FIGS. That is, the intercooler 36 for cooling the intake air is arranged at the inlet with the intake hole provided on the right side. A turbo fan 32 is arranged on the left side, and compressed air is supplied from a compressed air guide cylinder 33 to an intercooler 36 by a guide pipe 34. The intercooler 36 is configured to be supplied with the cooling water discharged from the sub radiator cooling water pump 9. The sub radiator fan 2 is arranged in the fan shaft 2a portion of the sub radiator fan 2, and is driven by the rotation of the fan shaft 2a.

Next, the structure of the vibration-proof rubber support 3a integrally attached to the ladder frame 3 will be described with reference to FIGS. Conventionally, an engine foot that protrudes from the side surface of the cylinder block 8 is provided, and the vibration isolation support rubber 11
He was supporting 13. In the present invention, the anti-vibration rubber support 3a is integrally projected with the ladder frame 3 without providing another engine leg.

Next, referring to FIG. 9, FIG. 10, FIG. 11, and FIG. 12, the structure for driving the camshaft 5 from the drive side sprocket 23 of the crankshaft 20 will be described. When the unit injector U is provided in the cylinder head 16 and the cam shaft 5 is supported by the cylinder head 16, the mechanism for transmitting the rotation of the crank shaft 20 to the cam shaft 5 by reducing the rotation of the crank shaft 20 to the cam shaft 5 is configured by gears. You cannot do it. Therefore,
Power is transmitted between the drive side sprocket 23 provided on the crankshaft 20 and the driven side sprocket 49 via the timing drive chain 24 as shown in FIGS. 11 and 9. However, when the timing drive chain 24 becomes longer as in the above configuration, the pins of the chain are worn and stretched, and the timing shift easily occurs.

In the present invention, in order to solve this problem, a counter shaft 45 is provided between the drive side sprocket 23 and the cam shaft 5, the counter sprocket 22 is arranged on the counter shaft 45, and the drive side sprocket 23 is provided. Power is transmitted between the counter sprocket 22 and the counter sprocket 22 by the timing drive chain 24. The speed reduction ratio between the drive side sprocket 23 and the counter sprocket 22 is reduced to about 1: 3, which is larger than 1: 2. Then, the excessive deceleration is accelerated between the counter gear 22 and the cam shaft drive gear 19 to be returned to 1: 2.

In FIG. 13, a bevel gearbox 27 is provided at the front end of the crankshaft 20, the power transmission direction is changed by the bevel gears 28 and 29 inside the bevel gearbox 27, and the power can be transmitted to the working machine by the downward PTO shaft 26. There is.

[0022]

Since the present invention is configured as described above, it has the following effects. That is, as in claim 1,
Connect the unit injector U and the cam shaft 5 to the cylinder head 1
In the internal combustion engine arranged in the vicinity of 6, since the sub radiator 1 is arranged in the space on one side of the cylinder block 8, the cooling water is further cooled by the sub radiator 1 more than the cooling by the main radiator fan 37. Therefore, the cooling efficiency is improved, and the output performance of the internal combustion engine can be improved. Further, although the sub radiator 1 is provided separately from the main radiator fan 37, the sub radiator 1 is arranged using an empty space on one side of the cylinder block 8, so that the entire configuration of the internal combustion engine may be increased. There is no.

As described in claim 2, the sub-radiator fan 2 for supplying the cooling air to the sub-radiator 1 is provided with the crankshaft 20.
Driven by the fan shaft 2 of the sub radiator fan 2
Since the sub radiator cooling water pump 9 is configured to be driven by a, a bevel gear that drives the sub radiator fan 2 from the crankshaft 20 without arranging a shaft and a pulley for driving the sub radiator cooling water pump 9 separately. The sub radiator cooling water pump 9 can be driven only by the pulleys, and the power transmission system of the two radiators provided can be simplified.

Since the water discharged from the sub radiator cooling water pump 9 is passed through the intake intercooler 36 of the internal combustion engine, the intercooler 36 for cooling the sub radiator 1 with the cooling water is separately arranged. As a result, the intake air to the diesel engine can be cooled, and the output performance of the diesel engine can be improved.

As described in claim 4, the unit injector U
In the internal combustion engine in which the camshaft 5 and the camshaft 5 are arranged in the vicinity of the cylinder head 16, the timing drive chain 24 is wound between the crankshaft 20 and the camshaft 5 to drive the timing drive chain 24.
Since a counter speed increasing mechanism is provided between the crankshaft 20 and the camshaft 5 and the reduction ratio by the timing drive chain 24 is made larger than 1: 2, the timing is directly transferred from the crankshaft 20 to the camshaft 5. Since the length of the timing drive chain 24 can be shortened as compared with the case where the drive chain 24 is hung, the elongation of the link of the chain can be reduced and the timing deviation can be reduced. .. Further, the speed is reduced more than 1: 2, and then the speed is increased by the speed increasing mechanism. Therefore, by increasing the reduction ratio of the timing drive chain 24 itself, the applied pulling force becomes small, so that the pulling force is small. Therefore, the elongation of the link can be further reduced.

According to a fifth aspect of the present invention, the ladder frame 3 is interposed between the cylinder block 8 and the oil pan 4, and the bearing portion of the crankshaft 20 is supported between the cylinder block 8 and the ladder frame 3. Since the internal combustion engine is integrally attached to the ladder frame 3 with the anti-vibration rubber support 3a,
There is no need to attach the engine block to the cylinder block 8 or the sub radiator cooling water pump 9 as in the conventional case,
The anti-vibration support rubbers 11 and 13 can be directly supported by the anti-vibration rubber support 3a protruding from the ladder frame 3, and the configuration is advantageous in terms of assembly and strength.

[Brief description of drawings]

FIG. 1 shows a sub radiator 1 on the side of a cylinder block 8.
FIG. 3 is a front cross-sectional view of an internal combustion engine in which is arranged.

FIG. 2 is a side sectional view of the internal combustion engine of FIG.

3 is a plan sectional view of a portion of a sub radiator 1 and a sub radiator fan 2 of the internal combustion engine of FIG.

FIG. 4 is a side sectional view showing a portion of a sub radiator fan 2, a main radiator fan 37, and a sub radiator fan 2.

FIG. 5 shows a turbo fan 32 provided on the exhaust side of the internal combustion engine,
The front sectional view of the embodiment in which the intercooler 36 is attached to the intake side and the cooling water from the sub radiator cooling water pump 9 is guided to the intercooler 36.

FIG. 6 is a front view of a turbo fan 32 and a compressed air guide tube 33.

FIG. 7 is an enlarged front view of the configuration in which the vibration damping rubber support body 3a is provided on the ladder frame 3.

FIG. 8 is a front sectional view showing another embodiment of the vibration-proof rubber support 3a.

9 is a front cross-sectional view of a structure in which power is transmitted from the drive side sprocket 23 of the crankshaft 20 directly to the driven side sprocket 49 of the camshaft 5 by the timing drive chain 24. FIG.

10 is a front cross-sectional view of an embodiment in which power is transmitted from a driving sprocket 23 to a counter sprocket 22 by a timing drive chain 24 and a speed increasing mechanism is interposed between the cam shaft 5 and the counter sprocket 22. FIG.

FIG. 11 is a drawing of only the drive portion of the embodiment in which the drive side sprocket 23 directly transmits power to the driven side sprocket 49.

FIG. 12: Drive side sprocket 23 and cam shaft drive gear 1
9 is a drawing of a configuration in which a speed increasing mechanism is interposed between 9 and 9.

FIG. 13 is a side sectional view showing a state in which a downward PTO shaft 26 is projected from the crankshaft 20.

[Explanation of symbols]

 U unit injector 1 sub radiator 2 sub radiator fan 3 ladder frame 4 oil pan 5 cam shaft 6 fuel pump 7 fuel injection valve 8 cylinder block 9 sub radiator cooling water pump 11, 13 anti-vibration support rubber 32 turbo fan 36 intercooler

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical display location F02B 67/06 Z 8614-3G F02F 7/00 301 F 7616-3G F02M 39/02 A 9248-3G

Claims (5)

[Claims] 1. An internal combustion engine in which a unit injector U and a cam shaft 5 are arranged in the vicinity of a cylinder head 16,
An internal combustion engine in which a sub radiator 1 is arranged in a space on one side of a cylinder block 8. 2. The internal combustion engine according to claim 1, wherein a sub-radiator fan 2 that supplies cooling air to the sub-radiator 1 is driven by a crankshaft 20, and a sub-radiator cooling water pump is driven by a fan shaft 2a of the sub-radiator fan 2. 9. An internal combustion engine, characterized in that it is configured to drive 9. 3. The internal combustion engine according to claim 2, wherein discharge water from the sub radiator cooling water pump 9 is passed through an intake intercooler 36 of the internal combustion engine. 4. An internal combustion engine in which a unit injector U and a cam shaft 5 are arranged near a cylinder head 16,
The timing drive chain 24 is wound between the crankshaft 20 and the camshaft 5 to drive the timing drive chain 24.
The internal combustion engine is characterized in that a counter speed increasing mechanism is interposed between 0 and the camshaft 5 so that the reduction ratio by the timing drive chain 24 is larger than 1: 2. 5. A ladder frame in a structure in which a ladder frame 3 is interposed between a cylinder block 8 and an oil pan 4 and a bearing portion of a crankshaft 20 is supported between the cylinder block 8 and the ladder frame 3. Anti-vibration rubber support 3
An internal combustion engine characterized in that a is integrally attached.