JPH045806B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to the arrangement structure of an intercooler used in a supercharged multi-cylinder engine, and in particular to an intercooler arrangement suitable for a diesel engine employing a mixing elbow. Regarding layout structure.

(Prior Art) Fig. 1 is a schematic front view of the upper part of the engine. As shown in Fig. 1, in a general engine, an intake manifold 2 and an exhaust manifold 3 are arranged on both sides of the cylinder head 1 at the upper end of the engine body. It has been installed. In such an engine, when an intercooler 5 is provided, a structure in which the intercooler 5 is provided above the intake manifold 2 has conventionally been widely adopted. This conventional structure has the advantage that the air duct connecting the intake manifold 2 and intercooler 5 can be shortened, but on the other hand, the intercooler 5 and intercooler air duct 6 protrude significantly above the cylinder head 1, making the overall engine more compact. The problem is that it is blocked.

(Objective of the Invention) In order to solve the above-mentioned problems, the present invention aims to improve the arrangement structure of an intercooler.

(Structure of the Invention) The present invention provides a multi-cylinder engine with a supercharger in which an intake manifold is disposed on one side of the engine body, and an exhaust manifold, an alternator, and a mixing elbow are disposed on the other side of the engine body. The alternator and the mixing elbow are juxtaposed in a line on the outside, and an intercooler is juxtaposed in the space between the alternator and the mixing elbow so as not to protrude laterally and vertically from both. There is.

(Example) In FIG. 2, which is a schematic side view, an engine body 1 consisting of a cylinder block, cylinder head, etc.
For example, 0 has a flywheel housing 1 at the rear end.
1, a supercharger 12 is arranged generally above the housing 11 and behind the engine body 10, and an alternator 13 is arranged near the upper part on the opposite side (front side). Between the supercharger 12 and the alternator 13, an exhaust manifold 15 and an intercooler 16 are provided on the upper side of the engine body 10, extending parallel to the crankshaft 17 (only the center line is shown). A fresh water cooler 20 is provided along the upper end surface. An intake air duct 21 of the intercooler 16 extends generally above the supercharger 12 and behind the fresh water cooler 20, and has an outlet connected to the rear upper end of the intercooler 16. A discharge air duct 22 of the intercooler 16 extends along the front and upper surface of the air duct 21, and has an inlet connected to the upper front end of the intercooler 16. A mixing elbow 25 is attached to the supercharger 12. The mixing elbow 25 is located behind the exhaust manifold 15 and the intercooler 16, and a seawater pipe 26 is provided between the mixing elbow 25 and the fresh water cooler 20. seawater pipe 26
is the rear end of the fresh water cooler 20 and the mixing elbow 25
The front ends of the mixing elbow 25 are connected to each other, and seawater is supplied from the fresh water cooler 20 to the mixing elbow 25 via a seawater pipe 26. A seawater pipe 27 that supplies seawater to the fresh water cooler 20 is provided near the seawater pipe 26. The exhaust outlet 28 of the mixing elbow 25 opens rearward and diagonally downward, and is connected to an exhaust pipe (not shown).

Partial cutaway of Fig. 2 - No. 3, which is a schematic diagram in the direction of the arrows
As shown in the figure, an intake manifold 30 is provided on the opposite side of the exhaust manifold 15 across the upper part (cylinder head) of the engine body 10. The compressor 31 of the supercharger 12 is located almost directly behind the engine body 10, and the turbine 32 of the supercharger 12 is located between the exhaust manifold 15 and the fresh water cooler 20.
It is located almost directly behind. The mixing elbow 25 is located outside the turbine 32 (on the opposite side from the compressor 31), and is connected to the turbine 32 via a short exhaust pipe 24. The mixing elbow 25 and the alternator 13 protrude sideways (to the left in FIG. 3) by approximately the same amount, and the intercooler 16 adjacent to the outside of the exhaust manifold 15 is located approximately in the space between the alternator 13 and the mixing elbow 25. It is located only within. In other words, the intercooler 16 is the alternator 13
It hardly protrudes outward or in the vertical direction with respect to the mixing elbow 25. In addition, Shimizu cooler 2
0 is a multi-tube type, and the mixing elbow 25 is a plate fin type. Further, the fresh water cooler 20 is adjacent to the upper surface of the exhaust manifold 15, and almost the whole of the fresh water cooler 20, except for the cap 33 at the upper end, occupies a position lower than the upper end of the engine body 10.

(Function) Exhaust gas from the engine enters the turbine 32 of the supercharger 12 from the exhaust manifold 15 through the exhaust pipe 34 (Fig. 2), drives the supercharger 12, and then exhausts from the mixing elbow 25 (not shown). is discharged into the pipe. After the air sucked into the compressor 31 of the supercharger 12 is pressurized by the compressor 31, it flows into the intercooler 16 from the air duct 21 in FIG. The air is supplied to the combustion chamber via the intake manifold 30 shown in FIG. The seawater supplied to the fresh water cooler 20 from the sea water pipe 27 in FIG. This seawater mixes with the exhaust gas in the mixing elbow 25 to reduce the thermal energy and noise energy of the exhaust gas, and is discharged together with the exhaust gas into the exhaust pipe.

(Effects of the Invention) According to the structure of the present invention described above, since the intercooler 16 is disposed outside the exhaust manifold 15, the intercooler 16 does not protrude significantly above the engine body 10, and the engine The overall height can be lowered to make it more compact. Generally, the alternator 13 and the mixing elbow 25 are often installed at both ends of the engine and on the exhaust manifold 15 side, and in such an engine, a space is formed on the side of the exhaust manifold 15 and between the alternator 13 and the mixing elbow 25. However, in the present invention, since the intercooler 16 is housed in that space, the entire engine can be constructed as compactly as an engine without an intercooler. Furthermore, since the entire intercooler 16 is exposed to the side, there is an advantage that the intercooler 16 can be easily maintained.

(Another Embodiment) Although the illustrated intercooler 16 is a two-pass type intercooler, a one-pass type or three-pass type intercooler may also be adopted. The present invention can also be applied to engines that do not use the fresh water cooler 20.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of a conventional example, FIG. 2 is a schematic side view of an embodiment of the present invention, and FIG. 3 is a partially cutaway schematic view of FIG. 10...Engine body, 15...Exhaust manifold, 16...Intercooler, 30...Intake manifold.

Claims (1)

[Claims] 1. An intake manifold on one side of the engine body,
In a supercharged multi-cylinder engine in which an exhaust manifold, an alternator, and a mixing elbow are arranged on the other side of the engine main body, the alternator and mixing elbow are arranged in a row on the outside of the exhaust manifold, and the alternator and the mixing elbow are arranged in a row on the outside of the exhaust manifold. An intercooler arrangement structure for a multi-cylinder engine with a supercharger, characterized in that the intercooler is arranged in a space between both elbows so as not to protrude laterally or vertically beyond both elbows.