JPH0441924A - Variable air intake device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] Miyazaki 1 Town relates to intake pipe devices that introduce intake air (fresh air) to the intake port of an engine, and particularly relates to a long intake pipe that guides intake air to the intake port. This invention relates to a variable intake device in which an intake pipe is provided with an intake control valve that combines different sizes and diameters and switches the path through which intake air flows depending on operating conditions.

[Conventional technology]

Such variable intake devices are often used for the purpose of obtaining excellent output performance by improving filling efficiency due to the inertia effect of intake air. This is because a negative pressure wave is generated in the intake pipe due to the suction action of the piston at the beginning of the intake stroke of the engine, and this negative pressure wave travels through the intake pipe and reaches the end of the pipe. At the tube end, the negative pressure wave is reflected and becomes a positive pressure wave with an opposite phase.
It flows into the cylinder. When a positive pressure wave flows into the cylinder when the intake valve is closed, the pressure inside the pipe becomes higher than atmospheric pressure, improving the filling efficiency. It is based on so-called inertia supercharging. This inertial supercharging effect is maximized when the system consisting of the cylinder and intake pipe is synchronized with the pressure vibration caused by the piston, and can be achieved by selecting the length and thickness of the intake pipe. Ru.

A conventional variable intake system will be explained with reference to FIG.

The variable intake device (■) is composed of a main body 1 on one side and a main body 10 on the other side.
and +1 are formed. First, to explain the other side main body 10, one end of the other side main body 10 is the intake port of the engine C (
(not shown), the other end of which is connected to the engine-side connecting intake passage 12 which opens to the joining flat surface 11; the other-side intake passage forming recess 13 which opens to the joining flat surface 11;
3, and the other side air intake passage 14 whose other end is open to the joining flat surface 11 is formed. And, ja section side connection intake passage 1
The engine C side end of No. 2 is mechanically connected (for example, by a bolt) to the engine C, and the other end of the engine side connecting intake passage 12 is directly connected to the other side intake passage forming recess 13 and the other side intake passage 14. connection is not made.

Next, to explain the one side main body 1, the one side main body 1 includes:
One side intake passage forming recess 3 which opens to the joint flat surface 2; and one side intake passage forming recess 3 whose one end opens to the joint flat surface 2 and the other end opens to the joint flat surface 2.
one side air intake passage 4 that opens to the side, an intake control valve 5 that is arranged in the one side air exhaust passage 4 and controls the opening and closing of the one side intake passage 4, and one end that opens to the joining flat surface 2 and the other side that opens and closes the one side air intake passage 4; A connecting intake passage 6 is formed that opens to one side intake passage 4 on the downstream side of the valve 5. In order to form the variable intake device V, the flat joint surface 2 of the main body 1 on one side and the flat joint surface 11 of the main body 10 on the other side are made to face each other, and the one main body 1 and the other main body 1O are connected. For example, they are joined by bolts. According to this, one side intake passage forming recess 3 of one side main body 1 and the other side main body 10
An intake chamber 20 is formed by the other side intake passage forming recess 13, and one end is connected to the cylinder of the engine C and the other end is opened to the intake chamber 20 by the one side air exhaust passage 4 and the engine side connecting intake passage 12. , a first intake passage 21 having an intake control valve 5 therein is formed, and further formed by the other side intake passage 14 and the connecting intake passage 6.

A second intake passage 22 is formed, one end of which opens into the intake chamber 20, and the other end of which opens into the first intake passage 21 downstream of the intake control valve 5.

The variable intake system Hv formed in this manner is mechanically attached to the engine C via the flange portion 12A provided at the end of the engine-side connecting intake passage 12 of the other side main body 10. Therefore, when the engine is operating at low speed, the intake control valve 5 of the first intake passage 21 is kept closed, and the second intake passage 2 of the engine C is closed.
2, the intake air flows from the intake control valve 5 to the first intake passage 21 on the engine side, increasing the flow velocity of the intake air and making use of the inertial effect synchronized to the low speed range.

During high-speed operation of the first engine, the intake control valve 5 is electrically, pressure-wise, or mechanically opened in addition to the intake flow during low-speed operation. Therefore, the suction resistance flowing through the first intake passage 21 is reduced, the period of the pressure wave region is shortened, and the synchronized rotational speed of the inertial effect is shifted to the high speed side.

[Problem to be solved by the invention]

According to such a conventional variable intake device, the weight of the device itself is heavy. This is because the other side main body 10 and the one side main body l are formed by sand casting or gravity casting. This is because the manufacturing method described above is required, and in the case of the one side main body 1, the shape of the connecting portion between the side air exhaust passage 4 and the connecting air intake passage 6 is complicated, so the manufacturing method described above is used. . The increased weight of the variable intake system is not preferable in terms of engine output efficiency when installed in a vehicle, and the weight of the system itself tends to increase significantly, especially when installed on a multi-cylinder engine. growing.

[Means to solve problems]

The variable intake device of the present invention was created in view of the above-mentioned problems, and its main purpose is to provide the device with reduced weight.In order to achieve the above-mentioned objective, the variable intake device is connected to each other. It is composed of one side main body and the other side main body having opposing flat joining surfaces, and the one side main body has a one side intake passage forming recess that opens to the joining flat surface, one end is connected to the intake port of the engine, and the other end is connected to the intake port of the engine. one side intake passage opening into the one side intake passage forming recess;
An intake control valve that controls the opening and closing of one side air extraction passage, and a connecting intake passage whose end opens to the one side intake passage downstream of the intake control valve and whose other end opens to the joint flat surface. On the other hand, the other side main body includes an other side intake passage forming recess opening to the joining flat surface, and an other side intake passage having one end opening to the other side intake passage forming recess and the other end opening to the joining flat surface. By joining the joining flat surface of the one side body and the other side body, an intake chamber is formed by the one side intake passage forming recess of the one side body and the other side intake passage forming recess of the other side body. At the same time, one end is connected to the first intake passage provided in one side of the body, one end of which connects to the engine cylinder and the other end opens to the intake chamber, the other side of the other side of the body, and the connecting intake passage. The second intake passage has a first intake passage downstream of the intake control valve, and a second intake passage whose other end opens into the intake chamber.

Therefore, parts that require rigidity for attachment to the engine,
By assembling the complex-shaped part of the connection part between the one-side ventilation passage and the connecting intake passage into one-side main body, and removing the part and complex-shaped part from the other-side main body, it is possible to attach it to the engine. The degree of freedom in manufacturing the other side main body can be increased, and the overall eave of the device can be increased.

〔Example〕

Hereinafter, one embodiment of the variable intake device according to the present invention will be described with reference to FIG. FIG. 1 shows a longitudinal sectional view of the variable intake system.

The variable intake device (2) is composed of a main body 30 on one side and a main body 40 on the other side, and joining flat surfaces 31 and 41 are formed on mutually opposing surfaces, respectively. One side main body 30 has a one side intake passage forming recess 32 that opens to the joint flat surface 31, one end is connected to the intake port (not shown) of the engine C, and the other end is open to the one side intake passage forming recess 32. one side air intake passage 33 that opens and closes the one side air intake passage 33; an intake control valve 34 that is disposed in the one side air extraction passage 33 and opens and closes the one side intake passage 33; A connecting intake passage 35 is formed which is connected to the one-side intake passage 33A on the more downstream side (the side closer to the engine C than the intake control valve 34).

The other side main body 40 includes an other side intake passage forming recess 42 that opens to the joining flat surface 41, and an other side intake passage that has one end opening to the other side intake passage forming recess 42 and the other end opening to the joining flat surface 41. 43
is formed.

Then, to form the variable intake system Hv, the joining flat surface 31 of the one side main body 30 and the joining flat surface 41 of the other side main body 40 are made to face each other and joined using a fastening member B such as a bolt. According to this, the intake chamber 5 is formed by the one side intake passage forming recess 32 of the one side main body 30 and the other side intake passage forming recess 42 of the other side main body 40.
0 is formed, and controlled intake air (fresh air) is introduced into this intake chamber 50. A first intake passage 51 is formed by the one side air extraction passage 33, one end of which is connected to the cylinder of the engine C, and the other end of which opens into the intake chamber 50.The other side intake passage 43 and the connecting intake passage 35 form one end A second intake passage 52 is formed, which opens into the intake chamber 50 and whose other end opens into the first intake passage 51 downstream of the intake control valve 34 . Such variable intake device V
In order to attach the engine C to the engine C, the first intake passage 5
The flange portion 51A at the engine side end of the engine is mechanically attached using a fastening member B such as a bolt.

On the other hand, when the engine is operating at low speed, the intake control valve 34
The first intake passage 51 is kept closed at this point, so that the intake air flows through the intake chamber 50 - the second intake passage 52 - the intake side U4 valve 3.
On the other hand, during high-speed operation of the engine C, the intake control valve 34 opens the first intake passage 51, so that the first intake passage 51
In addition to the above-mentioned intake flow, air is taken directly from the intake chamber 50.

Although this embodiment has been described with respect to a single variable intake system, it is possible to change the system according to a multi-cylinder engine equipped with multiple intake pipes, or an engine such as a series engine or a V-type engine. The invention is not limited in any way by this example.

〔Effect of the invention〕

As described above, according to the variable intake device according to the present invention, one main body has a first intake passage whose one end is connected to the intake port of the engine and the other end is open to the intake chamber, and a first intake passage which is downstream of the intake control valve. In addition to providing a connecting part between the first intake passage and the second intake passage, the variable intake system was attached to the engine through the main body on one side, so the main body on the other side had a connecting part between the first intake passage and the second intake passage. This eliminates the need for a connecting part with the intake passage. Therefore, the other side body does not require rigidity to support the entire variable intake system, and since it does not have complicated shaped parts such as connecting parts, it is possible to use molten metal instead of sand casting or gravity casting with the other side body. It has become possible to use aluminum alloy by so-called pressure die casting, which is press-fitted into the mold under high pressure, or synthetic resin material by injection molding.This makes it possible to reduce the weight of the other side of the main body, thereby reducing the overall weight of the variable intake system. This made it possible to significantly reduce the weight.

Further, the other side intake passage formed in the other side main body is a mere intake passage, and there is no intake control valve disposed inside or other passages intersecting and connected.
The other side intake passage can be formed with a tube, and by forming it with a tube in this way, the passage shape of the other side main body itself is simplified, so the mold structure is extremely simplified. It is possible to improve productivity.

Additionally, the passage length of the second intake passage, including the intake passage on the other side, may change depending on the engine to suit the engine, but in such cases, it can be handled by simply changing the pipe. This eliminates the need to rebuild the entire other side body each time, and provides a highly versatile variable intake device.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the variable intake device according to the present invention, and FIG. 2 is a longitudinal sectional view showing a conventional variable intake device. 30. One side main body 31. . . . Joint flat surface 32 . . . One side air extraction passage forming recess 33 . . . One side air extraction passage 34 . . . Intake control valve 35. , , Connection intake path 40 , , Other side main body 41. , , , Joint flat surface 42 , , Other side intake passage forming recess

Claims (3)

[Claims] (1) The variable intake device V is connected to the joining flat surfaces 3 facing each other.
1 and 41, and the other side main body 40, the one side main body 30 has a one side intake passage forming recess 32 that opens to the joint flat surface 31, and one end that is connected to the intake port of the engine C. A one-side intake passage 33 whose other end opens into the one-side intake passage forming recess 32, an intake control valve 34 that controls opening and closing of the one-side intake passage 33, and one-side intake passage whose one end is downstream of the intake control valve 34. A connecting air intake passage 35 is formed which opens to the passage 33A and whose other end opens to the joint flat surface 31, while the other side main body 40 has an other side intake passage forming recess 42 which opens to the joint flat surface 31. , and the other side intake passage 43 whose one end opens into the other side intake passage forming recess 42 and whose other end opens into the joining flat surface 41, and the joining flat surface 31 between the one side main body 30 and the other side main body 40. , 41
By joining these, the one side intake passage forming recess 32 of the one side main body 30 and the other side intake passage forming recess 42 of the other side main body 40
The intake chamber 50 is formed by the one side main body 30.
A first intake passage 51 has one end connected to a cylinder of the engine C and the other end opens into the intake chamber 50 via an intake control valve 34, and the other intake passage 43 of the other main body 40.
and the connecting intake passage 35, one end of which opens into the first intake passage 33 downstream of the intake control valve 34, and the other end of which opens into the intake chamber 50.
A variable intake device comprising: a second intake passage 52 that opens to the second intake passage 52; (2) The variable air intake device according to claim 1, wherein the other side main body 40 is formed of an aluminum alloy or a synthetic resin material. (3) The variable intake device according to claim 1, wherein the other side intake passage 43 as the second intake passage 52 formed in the other side main body 40 is formed of a pipe.