JP2002070566A - Intake system having integral mold type tumble control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact engine feeding system with a tumble control valve facilitating the fitting works by solving problems in fitting a conventional type tumble control valve, which is a butterfly valve fitted with a thin plate to a shaft of the tumble control valve by a screw, such as inferior workability and falling-off of the screw. SOLUTION: This tumble control valve for a multicylinder internal combustion engine, which is an integral mold tumble control valve having the tumble control valve part varying the opening cross sections of respective intake passages and a seal part preventing the mixing of the air flow between the respective feeding passages mutually continued, is characterized in that its axis is set in parallel to the axis of a variable intake long valve.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake device for an engine, and more particularly, to an intake device having an integrally formed tumble control valve.

[0002]

2. Description of the Related Art Conventionally, as a tumble control valve for controlling a tumble flow in a cylinder, a butterfly valve system in which a thin plate is screwed to a shaft is generally used. Further, as a valve driving device, a system has been used in which a negative pressure actuator and an electric motor are connected to a shaft via an intermediate link or an intermediate gear to apply a driving torque.

A technique in which a part of an intake port is partitioned by a partition to divide an air passage and a throttle valve is provided on one side is described in, for example, US Pat. No. 5,787,712. This also attempts to generate a tumble flow by changing the flow of air to concentrate the air-fuel mixture around the spark plug.

[0004]

In the conventional assembling of a butterfly valve for generating a tumble flow to an intake device, a shaft is inserted from the side where a plurality of intake ports are arranged so as to pass through each port. Then, a thin valve plate is mounted from the open end of the port and screwed and fixed. However, depending on the operation range of the valve, there is a problem that the insertion direction of the screw is oblique, and it becomes difficult to insert the screwing tool, resulting in poor workability. Also, it was difficult to manage the clearance and adjust the fully closed angle when the valve was fully closed. In addition, since the thin plate that becomes the valve is screwed to the shaft, it has the potential to damage the engine due to screw removal after mounting, and an intermediate mechanism for transmitting driving force between the valve and the valve drive device Therefore, there is a problem that the entire intake device becomes large.

It is an object of the present invention to reduce the number of parts and improve the efficiency and size of assembly work by eliminating the need for adjustment when the valve is fully closed. It is an object of the present invention to provide an intake device having a tumble control valve of the type.

[0006]

In order to achieve the object of the present invention, the present invention can be solved by the following means.

A main passage and a sub passage are formed by dividing the passage into two parts by a partition from the middle of an independent intake pipe passage for distributing air from the collector of the intake manifold to each cylinder of the engine, thereby forming a main passage and a sub passage. On the side, there is a tumble control valve that varies the projected area of the opening of the port, and in the one that generates a tumble flow in a cylinder, the cylinders are integrally formed to form a series of tumble control valves, and the tumble control valve is formed. It is characterized in that the axis of the valve is positioned parallel to the engine block mounting surface of the intake manifold.

When the intake device has a variable intake length valve, the center axis of the tumble control valve is positioned parallel to the axis of the variable intake length valve. Further, the outer diameter of the tumble control valve is larger than the diameter of the intake port to be opened and closed, a motor for driving the tumble control valve is disposed at one end of the tumble control valve, and the axial center of the drive shaft of the motor is It is characterized in that it coincides with the axial center of the tumble control valve.

A short branch having a shorter length than the independent intake pipe having one end communicating with one end of an independent intake pipe for distributing air to each cylinder of the engine from a collector of the intake manifold is provided. The short branch is provided with a variable intake length valve that opens and closes according to the operating conditions of the engine and changes the frequency of intake pulsation. A main passage and a sub passage that are divided into two parts, and a tumble control valve that varies the projected area of the opening of the port on the main passage side of the intake port, wherein the axis of the tumble control valve is variable. It is characterized in that it is arranged parallel to the axis of the intake length valve.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is an external view of an intake device attached to an engine. A tumble control valve 1 and a variable intake length valve 3 are provided.
b, 250c, 250d, a perspective view showing a state in which an intake module 200 on which a fuel rail 251, a throttle body 300, and an engine control unit 400 are mounted is attached to an engine block 100.

As shown in FIG. 1, the intake module 200 includes a throttle body 30 and an intake manifold 201 having a tumble control valve 1 and a variable intake length valve 3.
0, the engine control unit 400, the injectors 250a to 250d, and the sub-assembly on which the fuel rail 251 is mounted. Reference numeral 2 denotes a drive motor for the tumble control valve, which drives the tumble control valve 1. Reference numeral 4 denotes a drive actuator for the variable intake length valve 3, and reference numeral 201 denotes an intake manifold.

FIG. 2 is a sectional view of an independent intake pipe 201a of an intake manifold 201 provided with a tumble control valve 1 and a variable intake length valve 3 (201b to 201b).
01d). 206 is a main collector and 207 is a sub-collector.
Is opened and closed depending on the engine speed, and equivalently changes the intake pipe length. 204 is a short branch independent intake pipe.

The amount of air supplied to the engine is controlled by a throttle body 300 as a whole, and the main collector 206 controls each of the independent intake pipes (201a to 201a).
1d, 201a in FIG. 2). The independent intake pipe 201a is connected to the main passage 202a (202
The same applies to b to 202c) and the sub passage 203
a (the same applies to 203b to 203d) by the partition 210. The tumble control valve 1 is mounted on the main passage 202a (the same applies to the main passages 202b to 202c) so that it can be opened and closed (essentially, it may be mounted on any one of them). The tumble control valve 1 changes the cross-sectional area of the main passage by opening and closing the tumble control valve 1 to generate a tumble flow in the cylinder.

FIGS. 3 and 4 are sectional views showing the tumble control valve 1 in a fully closed and fully opened state.
This is an example in the case of 1a. When the engine is started, as shown in FIG. 3, the tumble control valve 1 is closed, and air is sent from the sub-passage 203a to generate a drift (tumble flow) in the cylinder, thereby causing the injector 250a (250
The same applies to b to 250d), so that the mixing of the fuel and the air sprayed is promoted to improve the combustion efficiency. In the present invention, the tumble control valve 1 is a cylindrical rotary valve integrally formed by integrating the intake pipes,
The individual intake pipes 201a to 201d are mounted so as to penetrate them at right angles (lateral directions).

At the time of starting, the tumble control valve 1 is fully closed as shown in FIG. As is clear from FIG.
Is larger than the opening height H of the main passage 202a (the same applies to the main passages 202b to 202c) (D>
H). As a result, the allowable range of the valve fully closed position can be increased. Θ in FIG. 3 indicates a fully closed range. This indicates that the main passage can be kept in a fully closed state if it is within this range. At the time of start, the valve is fully closed, but at the time of high rotation, the tumble control valve 1 is fully opened to increase the amount of air intake and increase the engine output. FIG. 4 shows the fully opened state.
In this case, air is supplied into the cylinder from both directions of the main passage 202a and the sub passage 203a.

FIG. 5 is a partial perspective view of the tumble control valve 1 formed integrally. Although only one cylinder is shown, it is integrally formed by connecting four cylinders. If a tumble control valve integrated with four cylinders is inserted from the side (for example, 1 in FIG. 1) and opened and closed, the main passage 2 of each cylinder can be obtained.
02a (the same applies to 202b to 202c) can be changed. That is, the tumble flow to each cylinder can be changed simultaneously. 5 in FIG.
1aT is the valve portion of the main passage 202a of the independent intake pipe 201a of the integrally formed tumble control valve, and 201bT is the main passage 20 of the independent intake pipe 201b.
2b, and 201cT represents a valve portion of the main passage 202c of the independent intake pipe 201c.

FIG. 6 is a view of the main passage and the sub passage viewed from the air flow direction. Reference numerals 1d and 1f denote coupling portions of adjacent cylinders with tumble control valves.
The seal portion c is included so that there is no mixing with air of the other cylinders adjacent to each other. The arrow P in FIGS.
Looking at the tumble control valve from the direction of, it looks cylindrical.

FIG. 7 is an AA sectional view of FIG. 2 showing the arrangement of the tumble control valve 1 and the variable intake length valve 3 and the arrangement of the tumble control valve and the drive motor. As shown in FIG. 7, the tumble control valve 1 is positioned so that the distance between the variable intake length valve 3 and the intake pipe open end 220 is the same in order to suppress variations in intake conditions of the intake air. The positions of the variable intake length valve 3 and the tumble control valve 1 are determined so that the distance between the variable intake length valve 3 and the tumble control valve 1 is the same for each cylinder (202a to 202d represent the main passage of each cylinder). For this purpose, the central axis 1a of the tumble control valve is aligned with the intake manifold 201 (201a
201d) parallel to the opening end face 220 (engine block mounting plane) and the central axis 3 of the variable intake length valve 3.
It is arranged parallel to a. 204a to 204a each represent a short branch of the independent intake pipe.

FIG. 7 is a sectional view taken along the line AA when the tumble control valve 1 is fully closed (FIG. 2), whereas FIG. 8 is a view when the tumble control valve 1 is fully open (FIG. 2). 4). The drive motor 2 of the tumble control valve 1 is mounted so that the center axis of the drive shaft 2a coincides with the center axis 1a of the tumble control valve 1, and the intermediate link mechanism is eliminated to reduce the size of the intake module 200. ing. The drive motor 2 uses, for example, a stepper motor. By configuring the tumble control valve in this way, the trouble of mounting the valve plate as in the related art is eliminated. In addition, since they are integrally formed, the engine is not damaged by the valve plate coming off.

[0020]

Since the tumble control valve is integrally formed for a plurality of cylinders, parallel positioning with the open end face of the intake manifold of the engine, or parallel positioning with the axial center when a variable intake length valve is provided, is easy. Thus, an intake manifold with less variation for each cylinder can be configured.

[Brief description of the drawings]

FIG. 1 is a perspective view of an entire engine intake device including a tumble control valve and a variable intake length valve.

FIG. 2 is a cross-sectional view of an independent intake pipe of an intake device including a tumble control valve and a variable intake length valve.

FIG. 3 is an enlarged sectional view of the tumble control valve (in a fully closed state).

FIG. 4 is an enlarged sectional view of the tumble control valve (in a fully opened state).

FIG. 5 is a partial perspective view of the tumble control valve.

FIG. 6 is a diagram showing a relationship between a main passage, a sub passage, and a tumble control valve as viewed from a flow direction of air.

FIG. 7A is a view of FIG. 2A when the tumble control valve is fully closed;
FIG. 2 shows a diagram representing a cross-sectional view of FIG.

FIG. 8A is a view of FIG. 2A when the tumble control valve is fully opened.
FIG. 2 shows a diagram representing a cross-sectional view of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Tumble control valve, 1a ... Tumble control valve center axis line, 2 ... Tumble control valve drive motor, 2
a: drive shaft, 3: variable intake length valve, 3a: variable intake length valve central axis, 4: variable intake length valve drive actuator, 100: engine, 200: intake module, 201: intake manifold, 2
01a to 201d: independent intake pipe (long branch), 22
0: Engine block mounting surface (opening end surface of intake manifold) 202a to 202d: Main passage
203a to 203d: sub passage, 204a to 204d
... Independent intake pipe (short branch), 206 ... Main collector, 207 ... Sub-collector, 250a-250d ...
Injector, 251, fuel rail, 300, throttle body, 400, engine control unit

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) F02M 35/10 F02M 35/10 102Y 301P (72) Inventor Shigeto Niizuma 2520 No. Daiba Kodai, Hitachinaka City, Ibaraki Prefecture (72) Inventor Teruhiko Minegishi 2477 Takaba, Hitachinaka-shi, Ibaraki F-term in Hitachi Car Engineering Co., Ltd. 3G031 AA15 AA28 AB05 AC01 AD03 AD08 BA07 BA14 BB05 BB09 DA34 DA36 DA38 FA03 GA01 GA05 HA01 HA04 HA11

Claims (5)

[Claims] An intake passage is divided into two parts by a partition from the middle of an independent intake pipe passage that distributes air to a plurality of cylinders of an engine from a collector of an intake manifold, and a port is provided on one of the divided main passage sides. A tumble control valve having a variable opening projected area and having a tumble flow generated in a cylinder, a series of tumble control valves formed by integrally molding the plurality of cylinders, and an axis of the tumble control valve An intake device having an integrally formed tumble control valve, which is positioned parallel to an engine block mounting surface of an intake manifold. 2. The integral molding of claim 1, wherein when a variable intake length valve is provided, a central axis of the tumble control valve is positioned parallel to an axis of the variable intake length valve. An intake device having a tumble control valve. 3. The intake device according to claim 1, wherein an outer diameter of said tumble control valve is larger than a diameter of an intake port portion to be opened and closed, and a corresponding intake port portion also has an intake port diameter corresponding to the outer diameter of the tumble control valve. An intake device having an integrally molded tumble control valve, characterized in that a larger portion is provided. 4. The intake device according to claim 1, wherein a motor for driving the tumble control valve is disposed at one end of the tumble control valve, and an axial center of a drive shaft of the motor coincides with an axial center of the tumble control valve. An intake device having an integrally molded tumble control valve, characterized in that the intake device is positioned by being positioned. 5. A short branch having a length shorter than that of the independent intake pipe, one end of which is in communication with one end of an independent intake pipe for distributing air to each cylinder of the engine from a collector of the intake manifold. The short branch is provided with a variable intake length valve that opens and closes according to the operating conditions of the engine and changes the frequency of intake pulsation. A main passage and a sub passage that are divided into two parts, and a tumble control valve that varies the projected area of the opening of the port on the main passage side of the intake port, wherein the axis of the tumble control valve is variable. It is positioned parallel to the axis of the intake length valve and positioned parallel to the engine block mounting surface of the intake manifold. Intake system with integral tumble control valve, characterized in that.