JP2599047B2 - Intake device for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake system for a fuel injection type internal combustion engine.

[0002]

2. Description of the Related Art In operating an internal combustion engine, a thin and long intake manifold is suitable at a low rotation speed. At high speeds, a thick and short intake manifold is suitable. Therefore, some cylinders of the intake manifold are divided into two parts in parallel, and an intake control valve is provided in one side passage, and one side is fully closed at low and medium speed rotation so that the low, medium and high speeds are optimal. The intake efficiency is improved by the effect of the intake inertia. At high speed, both sides are fully open, reducing intake resistance and ensuring high output.

[0003]

A conventional single manifold or a manifold divided into two parts in parallel has an intake air inertia effect in a low-to-medium-speed rotation region, but reduces intake air resistance in a high-speed rotation region. Even if this is possible, the resonance intake effect cannot be obtained in the high-speed rotation range. Therefore, the present invention is to provide an intake device that solves this problem.

[0004]

In order to achieve the above object, the present invention provides a chamber following a throttle body, and a manifold extending from the chamber penetrates through the chamber and communicates with the prime mover. The suction port is provided to be openable and closable in the manifold section of the above.

[0005]

According to the structure of the present invention, when the internal combustion engine is rotating at a low speed, if the intake port provided in the manifold section in the chamber is closed, the intake air passes through the long intake manifold,
It is possible to obtain the resonance suction effect at the time of low rotation, and to open the suction port at the time of high rotation, and to suck the air in the chamber directly from the suction port, thereby obtaining the resonance suction effect by this short suction manifold. Can be done.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a structural view showing an embodiment of the present invention, in which a chamber 2 is provided in connection with a throttle body 1 provided in a passage of intake air. Chamber 2
The manifold 3 is extended from the
Is bent 180 degrees out of the chamber 2 and penetrates through the inside of the chamber 2 to communicate with a cylinder 4 which is a motor.

[0007] The manifold 3 is cut in the chamber 2, and a tapered piece 5 is attached to the base side manifold 3 A of the cut portion, and is linked to the manifold 3 B on the cylinder 4 side. The tapered piece 5 works in conjunction with the actuator 6 and moves in the direction of the manifold 3 to seal the cut portion or to separate the cut portion to form an opening.

Therefore, when the actuator 6 is operated, at low speed, the air sucked from the throttle body 1 enters the chamber 2 and the manifold 3A,
It is sucked into the cylinder of the internal combustion engine via 3B. Also, at the time of high rotation, the tapered piece 5 in the chamber 2 is cut off from the manifold 3B on the cylinder 4 side, and the air sucked from the throttle body 1 is sucked from the chamber 2 directly into the cylinder 4 through the manifold 3B. It is.

In order to operate the actuator 6, the rotation speed of the prime mover may be read by an ignition coil or the like (not shown) and a vacuum switch (not shown) may be operated. The rotation speed depends on the purpose and performance of the prime mover. Just set it. In addition, since the effective prime mover rotation speed can be changed by the length of the manifold 3B for the resonance intake effect, if the length of the manifold 3B is determined according to the purpose of the internal combustion engine, the resonance intake effect of the internal combustion engine at the maximum speed can be obtained by the resonance intake effect. Output can be increased.

[0010]

As described above, according to the present invention, the resonance intake effect can be obtained at the time of maximum rotation, so that the output of the prime mover increases.
Further, the fuel consumption in the maximum rotation range is improved by the increased torque. In recent years, if used for a motor with variable valve timing that has been put into practical use, the length of the shorter manifold can be set in accordance with the valve timing of the camshaft for high rotation, and resonance will occur in the highest rotation range. Since the intake effect is obtained, the output of the prime mover is higher. Furthermore, since the manifold section with the suction port is wrapped in a chamber and the suction port is opened and closed in the chamber, all the intake air of the prime mover passes through the throttle and air flow sensor regardless of opening and closing of the suction port Therefore, the operation of the fuel injection device and the throttle does not change, and the prime mover can be accurately controlled.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

[Explanation of symbols]

 1 Throttle body 2 Chamber 3 Manifold 4 Cylinder 5 Taper piece 6 Actuator

Claims (1)

(57) [Claims] 1. A chamber is provided following a throttle body, a manifold extending from the chamber penetrates the chamber and communicates with a prime mover, and a suction port is provided in a manifold portion in the chamber so as to be openable and closable. An intake device for an internal combustion engine, characterized by: