JPH08105359A - Internal combustion engine intake manifold device - Google Patents

Abstract

PURPOSE: To improve equal distributivity of control gas such as intake gas and EGR gas with a simplified composition. CONSTITUTION: Surge tanks 12 are arranged by unevenly distributing them on the upper stream of intake gas and the connections 11a of intake gas manifolds 11 which are to be connected to the surge tanks 12 are formed so that they may come closer to the engine body 10 in proportion to their approach from the upper stream side to the lower stream side. The passage cross section of the surge tanks 12 are formed so that they may become smaller towards the lower stream of the intake gas. A spit hole 16 for control gas such as EGR gas is opened on the upper stream side of the intake gas inside the surge tanks 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake manifold device for an internal combustion engine, in which a surge tank for introducing intake air is connected to an upstream end portion of an intake manifold of the internal combustion engine, and more particularly to control of intake air and EGR gas. The present invention relates to a technique for improving the equal distribution of gas.

[0002]

2. Description of the Related Art Conventionally, as such an intake manifold device for an internal combustion engine, there are those disclosed in, for example, JP-A-63-61767 and JP-A-63-93462. That is, in the former one, the surge tank is provided at a position biased to one side in the longitudinal direction of the engine, and the intake passage of each cylinder is arranged in a direction in which the extension amount of the intake passage in the engine body width direction biases the surge tank. It is configured so that it gradually becomes larger.

Further, the latter one has a structure in which two control gases are simultaneously blown into an intake manifold, and a first blower is used.
The second control pipe and the second control pipe are integrally connected to each other with their adjacent partition walls being common, and the first and second control valves are mounted in opposite directions.

[0004]

However, in such a conventional intake manifold device for an internal combustion engine, the former one can effectively utilize the space in the engine room and achieve equal length, but the branch has the engine body. Since the structure is such that it is bent back to the side and connected to the surge tank, the space surrounded by the branches of the intake branch bent portion becomes biased, the piping for control gas etc. becomes complicated, and the cylinder etc. of these control gas etc. There was a problem that it was difficult to secure distribution.

Further, in the latter, although the control gas pipe can be made compact and the space in the engine room can be effectively utilized, the control gas pipe becomes a communication pipe having a capacity with respect to the intake system, so that the intake The mechanical effect is attenuated, and the engine output is reduced. Further, since each control gas is blown into each cylinder, it is difficult to ensure equal distribution, and the number of manufacturing processes such as hole machining increases, resulting in an increase in cost.

The present invention has been made in view of the above conventional problems, and provides an intake manifold device for an internal combustion engine which has a simple structure and improves the equal distribution of intake gases and control gases such as EGR gas. The purpose is to provide.

[0007]

To achieve the above object, the present invention connects an upstream end of each branch of an intake manifold of an internal combustion engine to a surge tank, and connects an upstream intake pipe to the surge tank. In an intake manifold device for an internal combustion engine, the surge tank is eccentrically arranged on the upstream intake pipe side arranged on the one end side in the cylinder arrangement direction of the engine body, and the upstream end of each branch of the intake manifold is arranged. The surge tank is formed so as to approach the engine main body from the upstream side to the downstream side of the intake, and the passage cross-sectional area of the surge tank is made smaller toward the downstream side of the intake.

Further, a passage for control gas or a blow-out pipe can be connected to the upstream side of intake air in the surge tank. Here, the control gas passage or the blowing pipe may be configured to be connected to the engine body side with respect to the connection portion of the intake manifold branch of the surge tank.

[0009]

According to this structure, the surge tank is eccentrically arranged on the upstream intake pipe side, which is arranged on one end side in the cylinder arrangement direction of the engine body, and the upstream end of each branch of the intake manifold is connected to the surge tank. Since the intake manifold is formed so as to approach the engine main body from the upstream side toward the downstream side, the intake manifold can be made compact and of equal length.

Further, the passage cross-sectional area of the surge tank is formed so as to become smaller toward the downstream side of the intake air, and the volume on the downstream side, which was difficult for the intake air to enter in the past, is easily reduced. As a result, the output can be improved. Further, since the control gas, for example, the passage or the blowing pipe of the EGR gas is connected to the upstream side of the intake air in the surge tank, the EGR gas is equally distributed in a state of being sufficiently mixed with the intake air, The exhaust emission performance can be improved.

In this case, if the control gas passage or blow-out pipe is connected to the engine main body side of the surge tank, the connection between the intake manifold branch on the intake upstream side in the surge tank and the engine main body is established. Since it has a relatively large space, it can be easily laid out. Further, since it is not necessary to provide control gas piping for each cylinder, cost reduction and size reduction can be achieved.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. First, referring to FIGS. 1 to 3, an intake manifold device according to an embodiment of the present invention will be described. That is, in the drawing, in order to introduce the outside air into the combustion chamber provided in the internal combustion engine 10, the intake manifold 1 is provided on the side surface of the internal combustion engine 10.
1 is connected.

The intake manifold 11 extends in a substantially horizontal direction from a connection portion with the intake port of the engine 10 and is then curved upward with an appropriate curvature. At the upstream end of each branch, Connection part 11 with surge tank 12
a, 11a ... Are formed. The connection portion 11a of each branch of the intake manifold 11 is connected to the engine body 1 from the intake upstream side to the downstream side in the surge tank.
It is formed so as to be close to 0, and the intake branch of each cylinder is made equal in length.

A passage 14 forming a part of an exhaust gas recirculation passage communicating with the exhaust passage 13 downstream is formed in a side surface portion of the cylinder # 4 on the upstream side of the intake manifold. This passage 14 is connected to one end of a tube that communicates with the exhaust passage 13 in order to suppress the generation of NOx in the exhaust gas. By communicating with the intake passage, a part of the exhaust gas (EGR gas)
Is led to the intake system. Reference numeral 17 denotes an EGR valve that controls the flow rate of the EGR gas B flowing through the exhaust passage 13.

The intake manifold connecting portion 11a,
A surge tank 12 common to all the cylinders is connected to the cylinders 11a, ... The surge tank 12 has a trapezoidal box shape along the cylinder row direction of the engine 10 to absorb intake pulsation. It has a sufficient volume. Further, the surge tank 12 is attached so as to be unevenly distributed on the intake upstream side of the throttle chamber 15 arranged on one end side in the cylinder arrangement direction of the engine body 10, and the passage cross-sectional area of the surge tank 12 is on the intake downstream side. It is formed so that it becomes smaller as it goes to. That is, the surge tank volume is formed to be reduced on the downstream side.

An EGR gas outlet 16 is opened in the surge tank 12 on the intake upstream side and on the engine body side. A throttle chamber 15 in which a throttle valve (not shown) is installed is connected to one end wall of the surge tank 12, and the throttle valve is opened / closed by the driver's accelerator pedal operation. The amount of air can be controlled.

The engine 10 on the outer wall of the intake manifold 11
A mounting portion 11b for mounting a fuel injection valve (not shown) is formed in the vicinity of a connection end portion of the fuel injection valve and the fuel injection valve so as to inject fuel toward the intake port of the engine 10. In this way, the surge tank 12 is unevenly arranged on the intake upstream side, and
Since the connection portion 11a of the intake manifold 11 connected to the intake manifold 11 is formed to be closer to the engine body 10 from the intake upstream side to the downstream side, the branch of the intake manifold 11 can be made compact and of equal length. it can.

Further, the passage cross-sectional area of the surge tank 12 is formed so as to become smaller toward the downstream side of the intake air, and the volume on the downstream side, which was difficult for the conventional intake air A to enter, is easily reduced. Distribution is achieved, and thus the output can be improved. Further, since the control gas, for example, the EGR gas outlet 16 is opened on the upstream side of the intake air in the surge tank 12, the EGR gas B is equally distributed in a state of being sufficiently mixed with the intake air A. hand,
The exhaust emission performance can be improved, and at the same time, since there is a relatively large space between the engine main body and the connection portion with the intake manifold branch on the intake upstream side, the outlet 16 can be easily laid out. You can The control gas includes auxiliary air for ISC, evaporation purge gas, and blow-by gas.

[0019]

As described above, according to the present invention,
The surge tank is eccentrically arranged on the upstream intake pipe side, which is arranged on one end side in the cylinder arrangement direction of the engine body, and the upstream end of each branch of the intake manifold is arranged from the intake upstream side to the downstream side in the surge tank. The intake manifold can be made compact and equal in length because the passage cross-sectional area of the surge tank is formed so as to be closer to the engine main body and the passage cross sectional area of the surge tank is smaller toward the intake downstream. Distribution is achieved, and thus the output can be improved.

Further, since the control gas passage or the blowing pipe is connected to the upstream side of the intake air in the surge tank, the control gas is evenly distributed in a state of being sufficiently mixed with the intake air. The exhaust emission performance can be improved. Furthermore, if the passage for control gas or the blowing pipe is arranged on the engine body side of the surge tank, the layout can be easily performed in a relatively large space.

[Brief description of drawings]

FIG. 1 is a plan view showing an intake manifold device for an internal combustion engine according to the present invention.

FIG. 2 is a plan view showing an intake manifold device portion of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

[Explanation of Codes] 10 Internal Combustion Engine 11 Intake Manifold 11a Connection Part 11b Attachment Part 12 Surge Tank 13 Exhaust Passage 14 Passage 15 Throttle Chamber 16 Outlet 17 EGR Valve A Intake (New Air) B Control Gas (EGR Gas)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location F02M 35/10 301 R 301 T

Claims (3)

[Claims] 1. An intake manifold device for an internal combustion engine, wherein an upstream end of each branch of an intake manifold of an internal combustion engine is connected to a surge tank, and an upstream intake pipe is connected to the surge tank. The surge tank is eccentrically arranged on the side of the upstream intake pipe arranged on one end side, and the main body of the engine is arranged as the upstream end of each branch of the intake manifold goes from the intake upstream side to the downstream side in the surge tank. An intake manifold device for an internal combustion engine, characterized in that the passage cross-sectional area of the surge tank is formed so as to become smaller toward the downstream side of intake air. 2. An intake manifold device for an internal combustion engine according to claim 1, wherein a passage for control gas or a blowing pipe is connected to an upstream side of intake air in the surge tank. 3. The intake manifold for an internal combustion engine according to claim 2, wherein the control gas passage or blowing pipe is connected to the engine body side with respect to the connection portion of the intake manifold branch of the surge tank. apparatus.