JP2514613Y2 - Variable air supply system for internal combustion engine - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable air supply device for an internal combustion engine, which is capable of obtaining a large torque from low speed to high speed.

[0002]

2. Description of the Related Art A variable air supply system for an internal combustion engine is shown in FIG.
As shown in FIG. 3, the air supply branch pipe (branch) of the internal combustion engine 1 is composed of two long and short branches 6a and 6b, and the valve 15 interposed in the short branch 6b is used in the low speed range (low speed range of the internal combustion engine). It is known that it is closed and opened in the high speed range to generate supply air pulsation according to the speed, aiming at both high torque in the low speed range.

Further, as disclosed in Japanese Patent Laid-Open No. 59-101535, an air supply chamber common to the air supply branch pipe of the internal combustion engine is provided, and the air supply chamber is connected to the air supply branch pipe in the axial direction. There is also one in which an inner tube that expands and contracts is provided, and this inner tube is expanded in a low speed range and contracted in a high speed range to generate a strong torque over a wide rotation range.

[0004]

However, in the former device, since the air supply branch pipe has two long and short branches, a wide installation space is required and the weight is increased. There is. Also, in the latter device, the effect is less if the expansion and contraction stroke of the inner pipe is short,
In order to lengthen the stroke, the air supply chamber has to be made large, and there is a problem that the device becomes large.

Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to provide a variable air supply system for an internal combustion engine which is compact and has a large effect.

[0006]

In order to achieve the above object, the present invention provides an air supply chamber common to an air supply branch pipe of an internal combustion engine, one end of which is opened in the air supply chamber and the other end is opened by rotation. Is provided with a curved pipe that is detachably connected to the air supply branch pipe, and a drive unit is connected to the curved pipe to disconnect the curved pipe from the air supply branch pipe in a high speed range.

[0007]

[Function] In the low speed range, the curved pipe is connected to the air supply branch pipe, and the pipe length of the air supply branch pipe is long, but in the high speed region, the curved pipe is rotated by the driving unit to move from the air supply branch pipe. It is detached and the pipe length is shortened. As a result, the supply air pulsation can be generated in the low speed region and the high speed region of the internal combustion engine, and a thick torque can be obtained from the low speed region to the high speed region. In particular, a curved pipe is used to change the pipe length of the air supply branch pipe, and it is made to rotate in the air supply chamber. Therefore, the pipe length can be greatly changed in a small space, resulting in a compact and great effect. Is obtained.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 is a V-type internal combustion engine, and a common air supply chamber (common chamber) 4 utilizing both banks 2 and 3 is provided between the left and right banks 2 and 3. The air supply chamber 4 is communicated with the atmosphere via an atmosphere side passage (not shown), while the upper wall 5 defining the air supply chamber 4 has openings 7 as many as the air supply branch pipes 6 in the internal combustion engine 1. Air supply branch pipes 6 led from a cylinder head 8a of each cylinder 8 are connected to the openings 7 formed in a line in the axial direction.

In the air supply chamber 4, one end 9a is provided in the air supply chamber 4
A curved pipe 9 which is opened inside and whose other end 9b is detachably connected to the air supply branch pipe 6 by rotation is provided by a support shaft 10 so as to be rotatable.

The curved tube 9 is formed in a U shape as shown in FIG.
It has a length sufficient to greatly change the pipe length of the supply branch pipe 6. These curved pipes 9 are integrally formed in the arrangement direction of the openings 7 (see FIG. 4) and are rotatably mounted in the air supply chamber 4 via a support shaft 10 provided at the center of the curved pipe 9. Has been.

A seat 11 is formed in the opening 7 so that the connecting end 9b of the bent pipe 9 can be easily attached and detached by turning, and when the bending pipe 9 turns counterclockwise, the connecting end 9b is connected to the opening 7. The connecting end 9b is disengaged from the opening 7 when the connecting end 9b is locked at the position where the connecting end 9b rotates clockwise.

A drive unit (actuator) 12 is connected to the curved pipe 9 for separating the curved pipe 9 connected to the supply branch pipe 6 in the low speed range from the supply branch pipe 6 in the high speed range. The drive unit 12 is arranged in the air supply chamber 4.

The drive unit 12 is composed of a vacuum motor or the like driven by a negative pressure in the air supply branch pipe 4, and pulls the curved pipe 9 in proportion to the rotation speed of the internal combustion engine 1.

Next, the operation of the embodiment will be described.

When the internal combustion engine 1 is in the low speed region (low speed region), the curved pipe 9 is connected to the air supply branch pipe 6 as shown in FIG. 3 (a), and the pipe length of the air supply branch pipe 6 is substantially the same. Is in a long state.

On the other hand, when the internal combustion engine 1 is in the high speed range (high speed range), the curved pipe 9 is rotated clockwise by the drive unit 12 and separated from the air supply branch pipe 6 as shown in FIG. 3B. As a result, the pipe length of the air supply branch pipe 6 is shortened.

As a result, the supply air pulsation can be generated in the low speed region and the high speed region of the internal combustion engine 1, so that a large torque can be obtained from the low speed region to the high speed region.
In particular, since the curved pipe 9 is used to change the pipe length of the air supply branch pipe 6 and is rotated in the air supply chamber 4, the pipe length can be greatly changed in a small space, which is compact. And a big effect can be obtained.

In the above embodiment, the drive portion 12 of the curved pipe 9 is
Is arranged in the air supply chamber 4, but when there is no installation space in the air supply chamber 4, one end of the support shaft 10 fixed to the central portion of the curved pipe 9 as shown in FIG. 4 to the outside, and the drive unit 12 may be connected thereto via the lever 13. Further, the above embodiment is the case where the present invention is applied to the V-bank engine, but when it is applied to the in-line engine as shown in FIG. 5, the independent air supply chamber 4 is formed close to the internal combustion engine 1. However, the curved pipe 9 may be provided in the air supply chamber 4.

[0020]

In summary, according to the present invention, since the curved pipe is used to change the pipe length of the air supply branch pipe and is rotated in the air supply chamber, the pipe length can be largely changed in a small space. It becomes possible to make it compact and to obtain a great effect.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the variable air supply device in FIG.

FIG. 3 is a diagram showing an operation of a variable air supply device.

FIG. 4 is a perspective view showing an embodiment in which the arrangement of the drive unit of the variable air supply device is changed.

FIG. 5 is a sectional view showing an embodiment in which the present invention is applied to an in-line type internal combustion engine.

FIG. 6 is a schematic sectional view showing a conventional variable air supply device.

[Explanation of symbols]

 1 Internal Combustion Engine 4 Air Supply Chamber 6 Air Supply Branch Pipe 9 Curved Pipe 12 Drive Unit

Claims (1)

(57) [Scope of utility model registration request] 1. A curved pipe provided with a common air supply chamber for an air supply branch pipe of an internal combustion engine, wherein one end is opened in the air supply chamber and the other end is detachably connected to the air supply branch pipe by rotation. A variable air supply device for an internal combustion engine, characterized in that a drive unit for connecting the bent pipe to the air supply branch pipe in a high speed range is connected to the curved pipe.