JPS587063Y2 - Intake system for multi-cylinder internal combustion engine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an intake system for a multi-cylinder internal combustion engine having an intercooler, and its purpose is to prevent variations in intake air temperature for each cylinder.

First, a conventional device will be explained using FIG.

Conventionally, an intercooler 1 as shown in Fig.
The adjusting plate A on the inlet 2 side and the adjusting plate B on the outlet 3 side are not provided.

In the illustrated embodiment, the intercooler 1 is installed on one side of the six-cylinder internal combustion engine 4 (on the near side in the figure), and extends long and narrow in the longitudinal direction of the engine 4, with a large number of cooling water passages extending horizontally inside. and an air passage in the vertical direction perpendicular to it,
A long and narrow air chamber 5 communicating with the air population 2 is fixed on the lower side,
One end of the air chamber 5 (the left end in the figure) passes through a duct 6 to the supercharger 7.
Connect to the air outlet (not shown).

An air chamber portion 8a of an intake manifold 8 is connected to the air outlet 3 on the upper surface, and an intake pipe portion 8b extending upward from the air chamber portion 8a is connected to the cylinder head of each cylinder.

9 and 10 are exhaust manifolds.

Therefore, in the case where there are no adjusting plates A and B in FIG.
Due to the inertial force of the pressurized air flowing into the inlet, the flow rate of the intake air passing through the intercooler part 1a near the duct 6 (on the supercharger side S) is higher than the flow rate of the intake air passing through the intercooler part 1a near the duct 6 (on the non-supercharger side S). ) The flow velocity of the intake air passing through the intercooler part 1b becomes larger, and therefore the amount of intake air flowing through the part 1b side increases than that of the part 1a, creating an intake air temperature difference as shown at T1 in Fig. 3, and increasing the temperature of each cylinder. This had the disadvantage of causing variations in exhaust temperature.

The cause of this difference in intake air temperature is the difference in the flow velocity distribution of the intake air in the intercooler 1. As shown by the solid arrow in Figure 1, the flow velocity is higher on the G side opposite to the supercharger side than on the S side of the supercharger. Therefore, in the intake manifold 8, the intake air that has left the intercooler outlet 3 flows from the S' side to the S side partially as shown by the broken line arrow, and receives heat from the exhaust manifolds 8, 10 and the cylinder head, causing a rise in temperature. It is thought that the temperature rises in the intake manifold 8 while moving from s'*+,+ to the S side.

In order to avoid the above-mentioned drawbacks, the present invention mainly provides air volume adjustment plates on both the air inlet and air outlet sides of the intercooler, so that the part of the intercooler corresponding to each cylinder can be adjusted so that the intake air temperature of each cylinder is the same. It is characterized by a fixed amount of passing air.

The adjustment plates A and B are specifically as shown in FIGS. 2 and 4.

The adjustment plate A is fixed to the longitudinal center of the air chamber 5 so as to fill a cross section perpendicular to the longitudinal direction of the air chamber 5, and has a large number of holes 13.
has.

The diameter of the hole 13 decreases as it goes downward, and therefore the effective passage area of the adjusting plate A gradually decreases as it goes downward.

In this way, when the air chamber population 5a is smoothly curved from the generally vertical upper end and connected to the horizontal air chamber main body as shown in FIG. 4, the flow velocity at the bottom of the air chamber 5 is suppressed and the inertia This makes it possible to prevent variations in the pressure within the air chamber 5 due to this.

This increases the flow velocity passing through a portion of the S-side intercooler.

The adjustment plate B on the intercooler outlet side is also provided with a large number of holes 14, and the diameter of the holes 14 is large on the S side and gradually decreases toward the S' side.

As a result, the effective passage area on the S side becomes larger than that on the S' side, and therefore, in conjunction with the action of the adjusting plate A, it is possible to equalize the amount of air passing through a portion of the intercooler corresponding to each cylinder.

In this case, the temperature distribution of the intake air is averaged as shown at T2 in FIG.

Therefore, according to the present invention, the air chamber population 5a of the horizontally elongated air chamber 5 is smoothly curved from the generally vertical upper end and connected to the longitudinal direction of the air chamber 5 main body, and the adjustment plate A on the air inlet 2 side A large number of holes 13 are provided in the adjustment plate A, filling the cross section perpendicular to the longitudinal direction of the air chamber 5, and the diameter of the holes 13 is decreased as the position goes downward, so that the effective passage area decreases as it goes downward. As a result, the energy loss of the compressed air can be reduced, and the flow velocity of the compressed air in the air chamber 5 is averaged by the adjusting plate A.

The adjustment plate A is formed such that the diameter of the hole 13 becomes smaller as it goes downward, and the air flowing at a high velocity through the bottom of the air chamber 5 is not only decelerated and adjusted by passing through the hole 13 having a small diameter. The slow-flowing air passing through the upper part of the chamber 5 passes through the large-diameter holes 13, so there is less energy loss due to resistance, and the air is evenly distributed to the intercooler 1.
It has the advantage of being able to be distributed to

In addition, the adjustment plate A can be much smaller than the type of adjustment plate that covers the entire surface of the air population 2 at the bottom of the intercooler 1.
There is an advantage that variations in flow velocity can be easily adjusted to the optimum state by appropriately shifting the mounting position of the plate A or by using a plurality of plates A.

Moreover, since there is no need to provide an adjustment plate with holes and covering the entire surface of the inlet 2 on the air population 2 side of the intercooler 1, the cooling member located near the bottom of the intercooler 1 is in the shadow of the adjustment plate, which prevents heat exchange. There is no need to worry about efficiency deterioration.

In addition, when embodying the present invention, a plurality of adjusting plates A may be arranged in parallel.

In FIG. 2, T is an intake temperature measurement point, and 15 is an intake valve.

[Brief explanation of the drawing]

Figure 1 is a side view of a six-cylinder internal combustion engine to which the present invention is applied, Figure 2 is a sectional view taken along the line ■-■ in Figure 1, Figure 3 is a graph showing the temperature distribution of intake air, and Figure 4 is a diagram showing the main parts. It is an exploded perspective view. 1...Intercooler, 2...Air inlet, 3...Air outlet, 4...6-cylinder internal combustion engine, 5...Air chamber , 7...Supercharger, 8...Intake manifold, A, B...
...Air volume adjustment plate.

Claims (1)

[Scope of utility model registration request] An elongated intercooler having an air inlet on the lower surface and an air outlet on the upper surface is installed on one side of the multi-cylinder internal combustion engine, and a horizontally elongated air chamber communicating with the air inlet is installed on the lower side of the intercooler, and one end of the intercooler is installed. In an intake system in which an elongated intake manifold connected to the air discharge port of the supercharger and communicated with the air outlet above the intercooler is installed, the air chamber inlet of the air chamber is smoothly curved from the generally vertical upper end. Connected in the longitudinal direction of the air chamber body, air volume adjustment plates are provided on both the air inlet side and the air outlet side of the intercooler, and the air volume adjustment plate on the air inlet side fills the cross section perpendicular to the quantum direction of the air chamber. A large number of holes are provided in the adjustment plate A, and the diameter of the holes is decreased toward the bottom so that the effective passage area is reduced as you go downward, and the adjustment plate on the air outlet side covers the air outlet and has a large number of holes. The diameter of the hole is larger on the air chamber inlet side and gradually decreases toward the other end, so that the diameter of the hole is larger on the air outlet side adjustment plate, and the diameter of the hole is gradually decreased toward the other end. An intake system for a multi-cylinder internal combustion engine, characterized in that the amount of air passing through is determined.