JP2000220540A - Structure of intake manifold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce negative pressure pulsation by simplifying the structure of an independent intake passage including a vacuum chamber. SOLUTION: A vacuum chamber 20 is formed between two independent intake passage 7 and 8 adjacent to each other at the center. The vacuum chamber 20 has a first vacuum chamber 21 connected to the first communication passages 21a and 21b communicated to the independent intake passages 7 and 8, and a second vacuum chamber 22b connected to the second communication passage communicated with this first vacuum chamber 21 through a check valve 23, and the second vacuum chamber 22b is provided with a negative pressure output port 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake manifold structure provided in an automobile engine.

[0002]

2. Description of the Related Art In a conventional intake manifold structure, a vacuum chamber is installed separately from the intake manifold, so that the vacuum chamber can be fixed or removed.
A hose was required to connect the vacuum chamber and the independent intake passage, and the configuration was complicated and expensive.

JP-A-8-100722 discloses that two air connectors for introducing air are provided upstream of a surge tank, and a vacuum chamber is provided between the surge tank and the air connector. There is disclosed a structure in which a negative pressure introducing hole and a through hole that communicate a surge tank and a vacuum chamber are provided, and an umbrella-shaped valve body made of an elastic member is inserted into the through hole.

[0004]

However, although the above prior art can be constructed at a low cost, the surge tank is divided into two for every three cylinders in a six-cylinder cylinder, and the resonance phenomenon between the two partition chambers is utilized. In this configuration, air is introduced into each cylinder, and the intake negative pressure is taken in from the vacuum chamber. For this reason, adjacent cylinders explode in sequence.
There is a disadvantage that the method cannot be applied to a four-cylinder engine whose combustion order is different from that of a cylinder engine. Further, since two air connectors for introducing intake air are provided upstream of the surge tank, the structure of the surge tank becomes complicated in order to uniformly introduce intake air to each cylinder.

An object of the present invention is to provide an intake manifold structure in which the structure of an independent intake passage including a negative pressure chamber is simplified and negative pressure pulsation can be reduced.

[0006]

In order to solve the above-mentioned problems and achieve the object, an intake manifold structure of the present invention has the following arrangement. That is, an intake manifold having a surge tank and an independent intake passage communicating the surge tank with an intake port of each cylinder, wherein a negative pressure chamber is provided between the independent intake passages.

Preferably, the independent intake passage and the negative pressure chamber are partitioned by a common wall.

[0008] Preferably, the negative pressure chamber is connected to a first negative pressure chamber connected to a first communication path communicating with the independent intake passage, and to a second communication path connected to the first negative pressure chamber. Second
A negative pressure chamber, and a negative pressure outlet is provided in the second negative pressure chamber.

Preferably, the first negative pressure chamber and the second negative pressure chamber are connected to each other.
It is separated from the negative pressure chamber by a common wall.

The first and second negative pressure chambers communicate with each other via a one-way valve.

Preferably, the first communication path and the second communication path are connected to each other.
It is substantially orthogonal to the communication path.

Preferably, the first communication passage is connected to a plurality of independent intake passages.

Preferably, the second negative pressure chamber has a first expansion chamber extending in the downstream direction of the intake air, and a second expansion chamber disposed in the upstream direction of the intake air of the first expansion chamber. The first expansion chamber and the second expansion chamber communicate with each other via a stenosis.

[0014]

As described above, according to the first aspect of the present invention, since the negative pressure chamber is provided between the independent intake passages, the intake manifold structure can be made compact.

According to the second aspect of the present invention, since the independent intake passage and the negative pressure chamber are partitioned by the common wall, the intake manifold structure can be made compact.

According to the third aspect of the present invention, the negative pressure chamber is connected to the first communication passage communicating with the independent intake passage.
A second negative pressure chamber connected to a second communication passage communicating with the first negative pressure chamber is provided, and a negative pressure outlet is provided in the second negative pressure chamber, so that the intake manifold structure can be made compact. Thus, negative pressure pulsation generated by intake pulsation can be reduced.

According to the fourth aspect of the present invention, since the first negative pressure chamber and the second negative pressure chamber are partitioned by a common wall, the intake manifold structure can be made compact, and the negative pressure generated by intake pulsation can be reduced. Pulsation can be reduced.

According to the fifth aspect of the present invention, the first negative pressure chamber and the second negative pressure chamber communicate with each other via the one-way valve, so that the second negative pressure chamber is connected to the first negative pressure chamber. Foreign matter can be prevented from adhering to the one-way valve due to the reverse flow of the pressure.

According to the sixth aspect of the present invention, since the first communication path and the second communication path are substantially orthogonal to each other, it is difficult to reverse the pressure from the second negative pressure chamber to the first negative pressure chamber. Accordingly, it is possible to prevent foreign matter from adhering to the one-way valve.

According to the invention of claim 7, since the first communication passage is connected to the plurality of independent intake passages, a higher negative pressure can be taken in and the negative pressure pulsation can be reduced.

According to the present invention, the second negative pressure chamber extends in the downstream direction of the intake air, and the second expansion chamber extends in the upstream direction of the intake air of the first expansion chamber. And the first
Since the expansion chamber and the second expansion chamber communicate with each other via the stenosis, negative pressure pulsation can be reduced.

[0022]

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

FIG. 1 is a front view showing an intake manifold structure according to an embodiment of the present invention.

As shown in FIG. 1, the intake manifold structure of the present embodiment is made of a cast product such as a heat-resistant resin or an aluminum alloy, and has a common intake passage 2 extending downstream from the throttle valve unit 1. The idle speed control (hereinafter, ISC) valve 3, a surge tank 5, and four independent intake passages 6 to 9 extending from the surge tank 5 are sequentially provided downstream of the throttle valve unit 1.

Each of the independent intake passages 6 to 9 is connected to each of the intake ports 10 to 13 of the four-cylinder engine. A fuel injection valve (not shown) is attached to each of the independent intake passages 6 to 9,
Fuel is injected from the intake port into each cylinder.

The flow passage area of the ISC valve 3 is adjusted to adjust the amount of intake air for bypassing the intake passage 2.
It is electrically controlled by the C valve actuator 4.

The ISC valve 3 controls to keep the idling speed constant, and controls the ISC at the time of idling when the throttle valve is fully closed to operate the engine at the best idling speed and reduce the vehicle speed. When the vehicle speed becomes equal to or more than a predetermined value, the throttle control is slightly executed to reduce the bypass air amount from that at the time of idling. Has become.

In this embodiment, a vacuum chamber 20 is formed between two centrally located independent intake passages 7 and 8 among the four independent intake passages. The vacuum chamber 20 is partitioned by the ribs 14 of the independent intake passages 7 and 8 or the side walls 7a and 8a of the independent intake passages 7 and 8. When the intake port is opened and a negative pressure is generated in the independent intake passages 7 and 8, the vacuum chamber 20 takes in the negative pressure from the independent intake passages 7 and 8 and interposes the swirl control in the intake passage (not shown). A negative pressure is applied to a valve drive actuator or the like.

The vacuum chamber 20 is provided not only between the two centrally adjacent independent intake passages 7 and 8 having substantially the same shape, but also between the outer independent intake passage 6 and the adjacent independent intake passage 7 adjacent thereto. Alternatively, it may be formed between the outside independent intake passage 9 and the independent intake passage 8 adjacent thereto.

FIG. 2 is a sectional view taken along line AA of FIG.

As shown in FIG. 2, the vacuum chamber 20 has a first communication passage 21 communicating with the independent intake passages 7 and 8.
a first negative pressure chamber 21 connected to the first negative pressure chamber 21 and a second negative pressure chamber 22 connected to a second communication passage 21 c communicating with the first negative pressure chamber 21 via a check valve 23. , Second
A negative pressure outlet 24 is provided in the negative pressure chamber 22. The first communication passages 21a and 21b and the second communication passage 21c have a substantially perpendicular positional relationship.

The check valve 23 is a one-way valve. When the inside of the first negative pressure chamber 21 reaches a predetermined negative pressure, the check valve 23 is opened to apply a negative pressure to the second negative pressure chamber 22. When the exhaust gas flows backward from the independent intake passage into the negative pressure chamber and becomes positive pressure, the valve closes and the impact of the exhaust gas does not act on the second negative pressure chamber 22.

When the check valve 23 is opened and the negative pressure in the first negative pressure chamber 21 acts in the second negative pressure chamber 22, the negative pressure is supplied through a hose 25 connected to the second negative pressure chamber 22. Is applied to the above-described swirl control valve drive actuator and the like. The hose 25 extending from the negative pressure outlet 24 is
In order to prevent the wobble, the hose fixing chuck 26 is used.
Is held by

The first communication passage may be connected to a plurality of independent intake passages 7 and 8 as shown in the drawing, or may be connected to either one of them.

The second negative pressure chamber 22 has a first expansion chamber 22a extending downstream of the independent intake passages 7, 8, and a second expansion chamber 22b formed upstream of the first expansion chamber 22a. The narrowed passage 22c communicating the first expansion chamber 22a and the second expansion chamber 22b is formed narrow to attenuate the intake pulsation of the independent intake passages 7 and 8.

The lower portion of the vacuum chamber 20 is fixed to the cylinder head by a fixing hole 27 with bolts or the like.

FIG. 3 is a sectional view taken along line BB of FIG.

As shown in FIGS. 1 and 3, the common air passage 2
An EGR device 30 is disposed below the throttle valve and downstream of the throttle valve unit 1. EGR device 30
Reduces the maximum temperature during combustion by recirculating a part of the exhaust gas discharged from the exhaust port to the common air passage 2 and sucking it into the combustion chamber together with the air-fuel mixture.
Decrease Ox.

The EGR device 30 includes an exhaust gas inlet 31 connected to an exhaust gas recirculation passage (not shown), an exhaust gas outlet 33 communicating with the common intake passage 2, an exhaust gas inlet 31 and an exhaust gas outlet. An EGR valve 32 provided in the middle of an EGR gas passage 34 which communicates with the EGR gas passage 34.
Part of the exhaust gas discharged from an exhaust port (not shown)
The gas is introduced into the exhaust gas inlet 31 and the opening of the EGR valve 32 is controlled to set the flow rate of the exhaust gas into the common air passage 2 to a predetermined amount. Is done.

It should be noted that the present invention can be applied to a modification or modification of the above embodiment without departing from the spirit thereof.

The present invention can be applied to all types of engines, such as in-line, V-type, and horizontally opposed, and the number of cylinders is not limited to four.
The present invention can be applied to three, five, six, eight cylinders or more cylinders.

[Brief description of the drawings]

FIG. 1 is a front view showing an intake manifold structure according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Throttle valve unit 2 ... Common intake passage 3 ... ISC valve 5 ... Surge tank 6-9 ... Independent intake passage 10-13 ... Intake port 14 ... Rib 20 ... Vacuum chamber

Continued on the front page (72) Inventor Kenya Ishii 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd. (72) Inventor Takayuki Tanaka 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda Co., Ltd.

Claims (8)

[Claims] 1. An intake manifold having a surge tank and an independent intake passage communicating the surge tank with an intake port of each cylinder, wherein a negative pressure chamber is provided between the independent intake passages. Intake manifold structure. 2. The intake manifold structure according to claim 1, wherein the independent intake passage and the negative pressure chamber are partitioned by a common wall. 3. The negative pressure chamber is connected to a first negative pressure chamber connected to a first communication path communicating with the independent intake passage, and a second negative pressure chamber is connected to a second communication path communicating with the first negative pressure chamber. The intake manifold structure according to claim 1, further comprising a pressure chamber, wherein a negative pressure outlet is provided in the second negative pressure chamber. 4. The intake manifold structure according to claim 3, wherein the first negative pressure chamber and the second negative pressure chamber are partitioned by a common wall. 5. The intake manifold structure according to claim 3, wherein the first negative pressure chamber and the second negative pressure chamber communicate with each other via a one-way valve. 6. The method according to claim 3, wherein the first communication path and the second communication path are substantially orthogonal to each other.
The intake manifold structure described in the section. 7. The intake manifold structure according to claim 3, wherein the first communication passage is connected to a plurality of independent intake passages. 8. The second negative pressure chamber has a first expansion chamber extending in a downstream direction of the intake air, and a second expansion chamber disposed in an upstream direction of the intake air of the first expansion chamber. The intake manifold structure according to any one of claims 3 to 7, wherein the first expansion chamber and the second expansion chamber communicate with each other via a constricted portion.