JPH025063Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for suppressing the rapid expansion noise generated by exhaust air when the intake control valve of an automobile engine is operated.

When the piston begins to descend during the intake stroke in the cylinder, the pressure at the cylinder inlet becomes negative pressure, and the air in the intake manifold and intake pipe flows toward the cylinder at a high speed, but as the piston approaches bottom dead center, the downward speed increases. Even if the air falls, the air flowing at high speed in the intake pipe converts its velocity energy into pressure energy, creates positive pressure at the cylinder inlet, and continues to flow into the cylinder, increasing intake efficiency. However, in order for this phenomenon to work effectively, the intake pipe must be long and thin.
It is better to close the intake valve later when the engine is running at high speed.

Therefore, the intake pipe is long from the air cleaner to the manifold, and the inside of the intake pipe is partitioned into two, or the intake pipe is divided into two from the front of the manifold. The present invention relates to the latter, in which the intake pipe is divided into two.

In FIG. 1, 1 is divided into two parts by the intake manifold. The intake pipe 2 is a single pipe with a partition from the air cleaner and is drawn close to the manifold 1, split into two in front of the manifold 1, and connected to the left and right manifolds 1. However, the two-pronged intake pipe is connected by a bypass pipe 3 before the intake manifold 1, and an intake control valve 4 is provided therein.

In other words, the inertia effect does not increase when the engine speed is low, so by opening the bypass and allowing intake air to enter the left and right intake manifolds 1 from either intake pipe 2, the inertia effect will increase when the engine speed becomes high. This is because the bypass pipe 3 is closed by the intake control valve 4.

Air energy from an air tank 5 is used to operate the intake control valve 4, which is opened and closed by an air cylinder 6. The operating air enters and exits the air cylinder 6 through the magnetic valve 7, and the used air after the operation is carried out through the magnetic valve 7.
Previously, the air was released into the atmosphere, creating the sound of rapid air expansion each time. When this sound occurs while driving, the driver perceives it as an abnormal sound and is forced to be mentally stressed each time it occurs. The present invention aims to reduce this sound.

In order to release the air that was conventionally released into the atmosphere into the intake pipe 2 for the above purpose, the present invention connects the air release port of the magnetic valve 7 and the intake pipe 2 to the air release pipe 8 as shown in FIG. It is connected by .
That is, the air is blocked from the atmosphere and released into a space surrounded by iron, so the sound insulation effect is great and it can be made almost silent.

As described above, the present invention makes it possible to eliminate the operation sound of the intake control valve, which is effective in controlling noise and also has the effect of preventing the mental stress of the occupants.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the conventional intake control valve-related parts, and Fig. 2 is an explanatory diagram of the air discharge pipe according to the present invention attached. 1...Intake manifold, 2...Intake pipe, 3...
Bypass pipe, 4...Intake control valve, 6
...Air cylinder, 7...Magnetic valve, 8
...Air release pipe.

Claims (1)

[Scope of utility model registration request] An intake control valve for an automobile engine, characterized in that an air discharge port of a magnetic valve for operating an air cylinder of an intake control valve and an intake pipe are connected by a pipe.