JPH0517416Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an intake manifold for an internal combustion engine.

(Prior Art) Intake manifolds installed in automobile engines have the function of distributing fresh air taken in from an air cleaner as well as recirculated gas such as recirculated exhaust gas and blow-by gas for exhaust gas regulations (for example, Utsukai Showa 58-129063, 59-
(Refer to Publication No. 100909).

Conventionally, as shown in FIG. 8, for example, an intake manifold 1 has a collector portion 2 having a predetermined volume.
The collector section 2 has an inlet section 9 for guiding intake air after passing through the throttle valve, and a partition wall 10 that partitions the inside of the collector section 2 into spaces 2A and 2B.
is formed, and a branch portion 4 branching into cylinders #1 to #6 is formed on the lower wall 8 along the partition wall 10 to form a space 2A.
and 2B are opened alternately.

The collector section 2 is connected to an exhaust recirculation passage 5 for guiding recirculated exhaust gas, a blow-by gas passage 6, and an auxiliary intake passage 7 for guiding an appropriate amount of fresh air bypassing the throttle valve during idling operation. At the same time, the reflux gas is distributed to each cylinder.

(Problem to be Solved by the Invention) However, due to constraints such as installation space, the outlet 7E of the auxiliary intake passage 7 and the outlet 6E of the blow-by gas are located downstream of the branch point 10A of the partition wall 10 and are opened. Most of the blow-by gas is drawn into cylinders #1, #3, and #5 from space 2B, while most of the auxiliary intake air is drawn into cylinders #2, #4, and #6 from space 2A. Therefore, there was a problem in that the combustion state of each cylinder varied, which impaired operational stability.

The present invention aims to solve the above problems.

(Means for Solving the Problems) The present invention includes an inlet section that guides intake air after passing through a throttle valve, and a substantially rectangular collector section that connects each branch section that communicates with each cylinder. The section is connected to one long side of the collector section, and a reflux gas passage and an auxiliary intake passage are separated from each other via a partition wall between the upper wall of the collector section and a cover that is joined to the upper wall of the collector section via a gasket. The ejection port of each passage is located near the inlet portion and opened, and the inlet of each passage is provided on the other long side of the collector portion.

(Function) In this way, by providing a cover that is joined to the upper wall of the collector section, it is possible to position each outlet of the recirculated gas passage and the auxiliary intake passage near the inlet immediately downstream of the throttle valve without being restricted by space, resulting in equal distribution of recirculated gas and fresh air to each cylinder, improving operating stability.

Furthermore, the passages defined between the upper wall of the collector section and the cover are not only independent from each other via the partition wall, but also extend from one long side of the substantially rectangular collector to the other long side. Since it is formed in such a manner that it crosses the upper wall of the collector section, even if multiple passages are provided in this way, the actual passage length and passage cross-sectional area of each passage are sufficiently secured, thereby preventing backflow of reflux gas, etc. The operability of the valve device can be maintained by preventing this, and the flow rate of the reflux gas can be suppressed to prevent corrosion such as erosion from occurring.

(Example) Hereinafter, an example of the present invention will be described based on the accompanying drawings.

As shown in FIGS. 1, 2, and 3, the intake manifold 1 is disposed between engine blocks 12 facing each other in a V shape, and the branch portion 4 connected to each cylinder is connected to the lower wall of the collector portion 2. An inlet part 9 is formed in one side wall 13 of the collector part 2, and the intake air taken in from the air cleaner 22 is connected to an outlet part 11 opening at the air intake flow meter 21.
After passing through the throttle valve 20, the air flows into the collector section 2 from the inlet section 9, and is branched from the collector section 2 to each branch section 4, where it is sucked into each cylinder.

The other side wall 14 of the collector section 2 is formed with a rearwardly projecting mount section 15 for attaching a recirculation exhaust gas control valve 25, a mount section 16 for attaching a blow-by gas control valve (PCV valve) 26, and a mount section 16 for attaching an auxiliary intake control valve. A mount portion 17 to which the idle air regulator 27 is attached, and a mount portion 18 to which the idle air control valve 28 is attached are formed.

A cover 31 is provided to be joined to the upper wall 3 of the collector section 2 via a gasket 30, and the upper wall 3
There are recesses 3 independent of each other on the outer surface of the
5, 36, and 37, respectively. Note that the cover 31 is fastened and fixed to the upper wall 3 with a plurality of bolts 32.

As shown in FIG. 4, the recess 35 is located on the cover 31
An exhaust gas recirculation passage 5 for guiding recirculated exhaust gas is defined between the concave portion 35 and a port 38 that communicates with the valve 25 via the mount portion 15. is formed near the opening of the inlet portion 9.

As also shown in FIG.
A blow-by gas passage 6 for guiding blow-by gas is defined between the concave portion 36 and a port 40 that communicates with the valve 26 via the mount portion 16.
is formed near the opening of the inlet portion 9.

As shown in FIGS. 6 and 7, an auxiliary intake passage 7 is defined between the recess 37 and the cover 31, and the recess 37 has a port 42 communicating with the regulator 27 via the mount 17. A port 43 that communicates with the valve 28 via the mount portion 18 is opened, and a jet port 44 that opens into the collector portion 2 is formed near the opening of the inlet portion 9.

With this configuration, in the intake manifold 1, the recirculated exhaust gas, blow-by gas, and auxiliary intake air are delivered to each outlet 3 through each passage 5, 6, and 7, as shown by the arrows in FIG.
9 , 41 , 44 near the opening of the inlet 9 , that is, directly downstream of the throttle valve 20 , the intake air flowing in from the inlet 9 is mixed with the air and is evenly distributed to each branch 4 . , driving stability can be improved.

By defining each passage independently on the upper wall 3 of the collector section 2 via the cover 31 and by making the substantial distance of the intake passage 7 for guiding auxiliary intake air large, recirculated exhaust gas and blow-by gas can be transferred to the auxiliary intake passage. 7 to the auxiliary intake control regulator 28 and the idle air control valve 27, thereby ensuring stable operability of these valve devices. Furthermore, since the cross-sectional areas of the exhaust gas recirculation passage 5 and the blow-by gas passage 6 can be made large, the gas flow rate flowing therethrough is slowed down, thereby suppressing corrosion such as erosion.

(Advantages of the Invention) As described above, the present invention provides the recirculated gas passage and the auxiliary air passage between the upper wall of the collector section and the cover covering it, and the outlets of the passages are opened near the inlets on one long side of the collector section, and the inlets of each passage are provided on the other long side of the collector section, ensuring sufficient effective length and cross-sectional area of each passage, thereby improving the distribution of the recirculated gas and the auxiliary air, improving the operating stability of the engine, and preventing the backflow of the recirculated gas and the occurrence of erosion. Also, the recirculated gas passage can be easily inspected by removing the cover, improving maintainability.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention;
Figure 2 is an overall front view, Figure 3 is a plan view, Figure 4 is a sectional view taken along line A-A in the same figure, and Figure 5 is B-B in the same figure.
6 is a sectional view taken along the line C--C in the same figure, and FIG. 7 is a sectional view taken along the line D--D in the same figure. FIG. 8 is a plan sectional view showing a conventional example. 1... Intake manifold, 2... Collector section, 3... Upper wall, 4... Branch section, 5... Exhaust recirculation passage, 6... Blow-by gas passage, 7...
Auxiliary intake passage, 9... Inlet section, 30... Gasket, 31... Cover, 39, 41, 44... Spout port.

Claims (1)

[Scope of utility model registration request] It includes an inlet section that guides intake air after passing through the throttle valve, and a roughly rectangular collector section that connects the branch section that communicates with each cylinder, and the inlet section is connected to one long side of the collector section. ,
A reflux gas passage and an auxiliary intake passage are formed independently through a partition wall between the upper wall of the collector section and a cover joined thereon via a gasket, and the jetting port of each passage is connected to the inlet section. What is claimed is: 1. An intake manifold for an internal combustion engine, characterized in that the intake manifolds are located adjacent to each other and the entrances of the respective passages are provided on the other long side of the collector portion.