JPS5982569A - Suction device for turbosupercharged engine - Google Patents

Abstract

PURPOSE:To make a device compact without reducing the supercharging effect by introducing compressed air from a turbosupercharger in the tangential direction through an expansion chamber midway on the suction passage and discharging it into a cylinder positioned in the tangential direction. CONSTITUTION:The compressed air generated by a turbosupercharger 9 flows into an expansion chamber 10, from its lower part on the opposite side to a cylinder head 6, through an introduction passage 11 and an inlet 10b, in the tangential direction of the first inner surface 10a and, after turning upward along the first inner surface 10a, the air is split into two at a splitting part 10c on the opposite side of the cylinder head 6. The air, then, is turned downward along the second inner surface 10d and discharged into each outlet introduction passage 12 through an outlet 10e which is opening in the tangential direction of the second inner surface 10d, and supplied to each cylinder from a suction port 3, after passing through an intake manifold 2a.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an intake system for a turbocharged engine.

Conventionally, there are exhaust vents that have an enlarged chamber in the middle of the intake passage to store intake air (for example, in the U.S.
-G, /g3,33. :Refer to No. z specification).

The enlarged chamber is required to have a large capacity in fuel injection type engines, especially diesel engines.

However, in automatic distortion, etc., the installation space for the engine is limited, and even if a turbo supercharger is attached along with the formation of the enlarged chamber, the intake system becomes stiff.
In order to make it more compact, one intake passage is formed by being bent. However, if the intake passage from the turbocharger to the engine cylinder is bent and corners are formed, there is a problem that the charging efficiency decreases and the supercharging effect is reduced. In a Kara/Taflow type engine with an open exhaust boat, the intake 1
The 0↓ passage and the exhaust passage are close to each other, ensuring all necessary expansion rooms, obtaining a good supercharging effect without obstructing air flow, and obtaining a compact arrangement structure. It's a shame.

In view of this point, the present invention includes a turbo supercharger in the direct intake path, and an enlarged chamber in the intake passage downstream of the turbo supercharger, the enlarged chamber having a first inner circumferential surface in the shape of an arc, an inlet in which an introduction passage through which all the compressed air from the turbocharger is introduced opens from the tangential direction of the first inner circumferential surface;
At the γ position, the arcuate second inner circumferential surface smoothly continues with the first inner circumferential surface, and the compressed air diverted from the inlet along the first inner circumferential surface and the third inner circumferential surface is transferred to the third inner circumferential surface. A lead-out passage is provided in the tangential direction of the inner circumferential surface and supplied to each cylinder. The turbocharger is equipped with an opening compound outlet, which provides an intake system for the engine, and is equipped with a large capacity expansion chamber.
Moreover, it is designed to be a conobacter without reducing the supercharging effect.

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, 1 is a counterflow type multi-cylinder (q-cylinder) diesel engine; 2 is an intake passage that supplies air to the intake boat 5 of each cylinder of the engine 1;
Reference numeral 4 denotes an exhaust passage through which all exhaust gas is led out from exhaust ports (not shown) of each cylinder. In addition, 6 is the cylinder head,
7 is a head cover, and 8 is a cylinder block.

On the other hand, the turbocharger 9 is interposed in the middle of the intake passage 2, and 10 is an enlarged chamber provided in the intake passage 2 downstream of the turbocharger 9. aisle 4
A turbine 9a driven by air gas flowing down the
And blower 9b? It rotates 1M1 and performs supercharging.

The exhaust passage 4 is connected to the turbine 9d of the turbocharger 9, and the exhaust manifold 4a that collects the gas is connected to the turbine 9d of the turbocharger 9, and the outlet of the turbine 9d is connected to the 4-gas pipe 4b. Concubine Sutra, sa:t], is.

In the intake passage 2, an intake manifold 2a curved upward from the intake port 5 is in contact with an enlarged chamber 10, and this enlarged chamber 10 is connected to the blower 9b of the turbo supercharger 9,
An intake W2b that supplies air from an air cleaner (not shown) is connected to the inlet of the blower 9b.

The enlarged chamber 10I''i is formed into a generally cylindrical shape as a whole.
], the central part is bent toward the cylinder head 6, and an introduction passage 11 for introducing compressed air from the outlet of the blower 9b of the turbocharger 9 is connected to the lower part of this central part. Two outlet passages 12 for supplying compressed air to each cylinder are connected f'.

An arcuate first inner circumferential surface 10a is formed on the inner surface of the cylinder head 6 side in the central portion of the enlarged chamber 10, and a first inner circumferential surface 10a is formed below the central portion. Introduction passage 1 introduced from the tangential direction of the inner peripheral surface 10a
The inflow port IOB 1 is opened. Further, the inner surface of the central portion opposite to the cylinder head 6 protrudes inward and is formed into a flow dividing portion 10c that divides the compressed air flowing along the first inner circumference 10a to the left and right.
On the left and right sides of c, arcuate second inner circumferential surfaces 10d that smoothly continue with the first inner circumferential surface 10a are formed at positions away from the inlet 10b. Furthermore, below the cylinder head 6+1tll on both sides,
Two outlet ports 10e are opened, each having a lead-out passage 12 for discharging compressed air in the tangential direction of the second inner circumferential surface 10d, and the periphery of the outlet port 10e is formed into a curved surface that gradually narrows. .

To explain the operation of the above embodiment, the turbo supercharger 9
The compressed air is sent to the cylinder head 6 to the expansion chamber 10.
γiiiu population 10 from the introduction passage 11 from the lower side opposite to
After bTh, the first inner periphery 1 (ir 10 a, 11th inflow 12, turns upward along this stile/inner periphery 1 fii 10 a VC, and then splits to the left and right at the dividing part 10 c on the opposite side from the cylinder head 6. Also, the second inner peripheral surface 10dK
The air is discharged from the outlet 10e opening in the tangential direction of the second inner circumferential surface 10d into each outlet passage 12, and is discharged from the intake manifold 2a? The air is then supplied to each cylinder from the intake port 6.

The present invention is not limited to the structure of the above embodiment, but includes all modifications thereof. That is, in the embodiment described above, the center portion of the enlarged chamber 10 is formed close to the cylinder head 6 side, and the pressure air is divided to the left and right side well, and the turbo supercharger 9 is arranged close to the cylinder head side. 6, but the center portion may be formed in the same way as the left and right portions, and the enlarged chamber 10 may be formed into a complete cylinder.
The connection position of the turbocharger 9 is also not limited to the central portion.

Further, in the above embodiment, the turbocharger 9 is placed downward in the enlarged chamber 1.
0 is placed above, this arrangement may be reversed vertically, but it is better to place the expansion chamber 10 above as in the above embodiment because of the layout based on the relationship with other auxiliary equipment. It is preferable. Furthermore, the expansion chamber 10 and the intake manifold 2a
In addition to being formed integrally, it may be formed by being divided vertically or horizontally depending on the manufacturing process.

On the other hand, the present invention can be applied not only to a counterflow type engine as in the embodiment but also to a crossflow type engine.

As explained above, according to the present invention, the enlarged chamber formed in the intake passage on the downstream side of the turbocharger has a smoothly continuous first inner peripheral surface and a first! The compressed air is fully introduced from the inlet in the direction tangent to the first inner circumference, and the first and second
By turning the compressed air along the inner circumference and discharging it from the outflow L1 in the tangential direction of the second inner circumferential surface and supplying it to each airflow, turbulence and contraction may occur in the flow of compressed air. The engine has the advantage of being able to fully demonstrate the supercharging effect by preventing a decrease in the amount of intake air without causing any problems, and by arranging the enlarged chamber and turbocharger in a compact manner, the engine can have a good layout. .

[Brief explanation of the drawing]

Drawings σ Illustrate one embodiment of the present invention; FIG. 1 is a plan view, and FIG. 2 is a plan view taken along line 1-H in FIG. 1. Diesel engine, 2. Intake passage, 6.
Intake port, 4... Exhaust narrow passage, 9... Turbo supercharger, 10... Expansion chamber, 10a... First inner peripheral surface, 1
0b...Inlet, 10c... Diversion part, 10d...
...Third inner peripheral surface, 10e - Outlet, 11...
Inlet passage, 12... Outlet passage

Claims (1)

[Claims] (1) In an engine equipped with a turbo supercharger in the intake passage, an enlarged chamber is provided in the intake passage downstream of the turbo supercharger, and the enlarged chamber has an arcuate first inner circumferential surface and the first inner circumferential surface. 1. An inlet in which an introduction passage for introducing compressed air for turbocharging opens from the tangential direction of the inner circumferential surface, and a circle that smoothly continues with the first inner circumferential surface at a position away from the inlet. An arcuate second inner circumferential surface, compressed air diverted from the inlet along the first inner circumferential surface and the second inner circumferential surface, and a derivation passageway that discharges compressed air in the tangential direction of the second inner circumferential surface and supplies it to each cylinder. An intake system for a turbocharged engine characterized by having a plurality of outlet ports each having an opening.