JPH0322530Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of an intake system for a supercharged engine.

(Prior Art) In an engine equipped with a supercharger, that is, an engine in which the supercharger is connected to an intake passage, a throttle valve is generally arranged in the intake passage downstream of the supercharger. This throttle valve is rotatably held by its rotating shaft being inserted into a holding hole formed in the wall of the intake passage.
Since the accelerator pedal and various actuators are linked to this rotation shaft, the rotation shaft extends toward the atmosphere, that is, the holding hole is open to the atmosphere.

In this way, when the holding hole that holds the rotating shaft of the throttle valve is open to the atmosphere, the lubricating oil filled in this holding hole is pushed out to the atmosphere by the boost pressure, and the throttle valve is This may prevent the valve from operating smoothly. For this reason, conventionally,
As shown in Japanese Patent No. 136841, there is a device in which the lubricating oil is prevented from scattering from the holding hole by actively supplying supercharging pressure to the atmosphere side end of the holding hole.

(Problem that the invention aims to solve) By the way, additional intake gas containing oil, such as blow-by gas, is often supplied to the intake passage of an engine, and this additional intake gas is supplied to each cylinder. In order to disperse it as evenly as possible,
Generally, it is supplied far upstream of the intake passage, more specifically upstream of the throttle valve. However, in this case, the oil in this intake additional gas is also supplied to the holding hole together with the supercharging air, and the oil in this intake additional gas is discharged to the atmosphere through the holding hole. , a new problem was to arise.

On the other hand, recently, in order to obtain resonance supercharging, for example, the intake passage downstream of the supercharger is separated into a first intake passage and a second intake passage which are independent of each other. It has been considered to provide throttle valves in both intake passages.

Therefore, an object of the present invention is to separate the intake passage downstream of the supercharger into a first intake passage and a second intake passage, which are independent from each other and are each provided with a throttle valve. , assuming that a throttle valve is disposed in each of the second intake passages, the lubricating oil is prevented from scattering into the atmosphere from the holding hole into which the rotation shaft of the throttle valve is inserted. An object of the present invention is to provide an intake device for a supercharged engine that can prevent oil in the intake additional gas from scattering into the atmosphere through the holding hole.

(Means and effects for solving the problem) The present invention was developed by focusing on the fact that the oil component in the intake additional gas tends to flow along the bottom wall side of the intake passage. , the second intake passages are arranged so as to have a vertical positional relationship at least in the throttle valve portion, and the inlet of the boost pressure supply passage to the holding hole for the throttle valve rotation shaft is arranged in this manner. The opening is made at the upper part of the lower intake passage of both the first and second intake passages and upstream of the throttle valve located within the lower intake passage. Specifically, an intake passage provided with a supercharger is configured to be separated into a first intake passage and a second intake passage that are independent of each other downstream of the supercharger, and the first intake passage includes a first intake passage. A throttle valve is disposed, and a second throttle valve is disposed in the second intake passage, and both the first and second intake passages are connected to each other at least in both the throttle valve portions. Among the holding holes, which are arranged in a vertical positional relationship, are passed through the tube walls of the first and second intake passages, and into which the rotating shafts of the throttle valves are inserted, an end on the atmosphere side An outflow port of the boost pressure supply passage is opened to the first part, and an inlet of the boost pressure supply passage is opened to the first part.
The opening is opened at the upper part of the lower intake passage of the second intake passage and upstream of the throttle valve located within the lower intake passage.

With this configuration, supercharging air containing almost no oil in the intake additional gas can be supplied to the holding hole of the throttle valve rotation shaft.

(Example) Hereinafter, an example of the present invention in which resonance supercharging is obtained will be described based on the attached drawings.

In FIG. 1, the engine body E has a first cylinder group A consisting of three cylinders 1, 2, and 3, and a second cylinder group B consisting of three cylinders 4, 5, and 6, forming a V-shape with each other. It is configured as a V type 6 cylinder arranged as follows. The ignition order of each cylinder 1 to 6 above is as follows:
For example, the sequence is 1 → 5 → 3 → 6 → 2 → 4, so that the ignition order of each cylinder 1, 2, and 3 of the first cylinder group A is not consecutive, and similarly, each cylinder 4 of the second cylinder group B ，
5 and 6 are also arranged so that the firing order is not consecutive.

A surge tank 7 is disposed between the cylinder groups A and B, that is, in the central space of the V bank, and in the embodiment, the surge tank 7 is a first surge tank 8.
It is also used as a second surge tank 9. That is, the surge tank 7 is connected to the partition wall 10
Therefore, the side closer to the first cylinder group A is the first intake expansion chamber 11 for the first surge tank 8, while the side closer to the second cylinder group B is the second intake expansion chamber 11 for the second surge tank 9. This is an intake expansion chamber 12. The cylinders 1, 2, and 3 of the first cylinder group A are individually and independently connected to (the first intake expansion chamber 11 of) the first surge tank 8 via independent intake pipes 13 to 15. . Furthermore, the cylinders 4, 5, and 6 of the second cylinder group B are individually and independently connected to (the second intake expansion chamber 12 of) the second surge tank 9 via independent intake pipes 16 to 18. There is.

The surge tank 7 further includes a passage member 19.
An air cleaner 20 is connected via. In the embodiment, this passage member 19 is connected to the air cleaner 2.
Starting from the 0 side, the first air intake passage serves as a common intake passage to which a supercharger (for example, turbocharger) 21 is connected.
It is composed of an intake pipe 22, a second intake pipe 23, a connector 24 made of an elastic body, a throttle body 25, and a double intake pipe 26. The second intake pipe 23
As shown in FIG. 2, the interior of the space from the throttle body 25 to the throttle body 25 via the connector 24 is defined by a partition wall into a first intake passage 27 and a second intake passage 28 which are independent of each other.

As shown in FIG. 2, the throttle body 25 has a first passage portion 25A forming a part of the first intake passage 27 and a second passage portion 25A formed by a partition wall.
Second passage section 25B forming part of intake passage 28
The passage portions 25A and 25B are set in a vertical positional relationship with each other. A first throttle valve 29 is disposed within the first passage section 25A, and a second throttle valve 30 is disposed within the second passage section 25B. Rotation axis 2
9a, 29b, 30a, and 30b are rotatably supported by the throttle body 25, respectively.
And each of the rotation shafts 29a, 29b, 30a,
30b extends outside the throttle depot, that is, toward the atmosphere, since actuators (not shown) are linked thereto.

The dual intake pipe 26 includes a first independent intake pipe 26A forming part of the first intake passage 27 and a second independent intake pipe 26B forming part of the second intake passage 28.
The two independent intake pipes 26A and 26B are integrated into the throttle body 25.
The connection sides (upstream sides) of the throttle body 25 are vertically connected to each other, so that the first independent intake pipe 26A is connected to the first passage part 25A of the throttle body 25, and the second independent intake pipe 26B is connected to the second passage part 25A of the throttle body 25. It is connected to section 25B. Further, the connection side (downstream side) of the two independent intake pipes 26A and 26B to the surge tank 7 is connected to the two intake expansion chambers 11,
12, the first independent intake pipes 2 are horizontally adjacent to each other.
6A is connected to the intake expansion chamber 12, and a second independent intake pipe 26B is connected to the intake expansion chamber 11.

With the above configuration, it is possible to improve the charging efficiency due to the resonance supercharging effect in a predetermined engine speed range.

The throttle body 25 includes rotation shafts 29a, 29b, 3 of each throttle valve 29, 30.
Four supercharging pressure supply passages 31 to 34 corresponding to the number of 0a and 30b are formed. The outlets 31a and 32a of the boost pressure supply passages 31 to 34 (outlets of the boost pressure supply passages 32 and 33 are not shown) are connected to each other as shown in FIGS. 3 and 4. Moving shafts 29a, 29b, 30a, and 30b are fitted. The holding hole 35 of the throttle body 25 is opened at the end of the holding hole 35 on the atmosphere side (in FIGS. 3 and 4, in order to clearly show the holding hole 35, (also drawn quite large). Moreover, the inflow ports 31b to 34b of the boost pressure supply passages 31 to 34 are connected to the second
As shown in the figure, it is opened at the upstream end surface of the throttle body 25 and communicates with the upper part of the second intake passage 28 located below. That is,
Although the first intake passage 27 and the second intake passage 28 are defined by the partition wall 24a of the connector 24, the left and right end portions of the partition wall 24a are largely curved upward. Directly below the left end in FIG. 2 of the upwardly curved partition wall 24a,
Two inlets 31b, 32b spaced apart from each other vertically
In addition, two inlets 33b and 34b are opened at a small distance vertically, just below the right end in FIG. 2 of the partition wall 24a.

In addition, such supercharging pressure supply passages 31 to 34
This can be done, for example, by drilling from the upstream end face of the throttle body 5 toward the holding hole 35.

With the above configuration, for example, when additional intake gas containing oil such as blow-by gas is supplied to the first intake pipe 22 immediately downstream of the supercharger 21, this oil is transferred to the throttle body 2.
5 and in this vicinity, each inlet 31 flows on the bottom wall side of both the first and second intake passages 27 and 28 and is located at the upper part of the second intake passage 28 on the lower side.
34b, almost no oil in this intake additional gas enters. As a result, clean supercharged air containing no oil is supplied to the holding hole 35. Therefore, the oil in the intake additional gas is prevented from scattering to the atmosphere through the holding hole 35. Of course, this holding hole 35
By supplying supercharging air to the holding hole 35, the lubricating oil in the holding hole 35 is prevented from scattering toward the atmosphere.
That is, inside the holding hole 35, the intake passages 27 and 28
The differential pressure between the two sides is almost eliminated, and the lubricating oil is prevented from scattering toward the atmosphere based on this differential pressure.

(Effects of the invention) As is clear from the above, the invention has the following effects:
By using supercharging air to prevent lubricating oil from scattering to the atmosphere from the holding hole into which the throttle valve rotating shaft is fitted, smooth operation of the throttle valve is ensured. It is possible to prevent the oil content in the intake additional gas from scattering to the atmosphere side through this holding hole together with the supercharging air.

[Brief explanation of the drawing]

FIG. 1 is an overall system diagram showing an embodiment of the present invention.
FIG. 2 is a sectional view taken along the line -- in FIG. 1. Figure 3 is the second
- Line sectional view of the figure. FIG. 4 is a sectional view taken along the line -- in FIG. 3. 19: Passage member, 20: Air cleaner, 21:
Supercharger, 22: First intake pipe (1 system), 23: Second intake pipe (2 systems), 24: Connector (2 systems),
25: Throttle body (2 systems), 25A: First passage section, 25B: Second passage section, 26: Double intake pipe, 27: First intake passage, 28: Second intake passage,
29: First throttle valve, 29a, 29b:
Rotation shaft, 30: Second throttle valve, 30a,
30b: Rotation shaft, 31-34: Supercharging pressure supply passage, 31a, 32a: Outlet, 31b-34b:
Inflow port, 35: holding hole.

Claims (1)

[Claims for Utility Model Registration] An intake passage provided with a supercharger is configured to be separated into a first intake passage and a second intake passage that are independent of each other downstream of the supercharger, and the first intake passage a first throttle valve is disposed therein, and a second throttle valve is disposed in the second intake passage, and both the first and second intake passages are arranged at least in both the throttle valve portions. of the holding holes, which are arranged in a vertical positional relationship with each other, are formed in the pipe walls of the first and second intake passages, and into which the rotation shafts of the throttle valves are fitted; An outflow port of the boost pressure supply passage is opened to the atmosphere side end, and an inlet of the boost pressure supply passage is connected to the first,
The intake air of a supercharged engine, characterized in that the air intake is opened at the upper part of the lower intake passage of the second intake passage and upstream of the throttle valve located within the lower intake passage. Device.