JP3397873B2 - V-type engine intake system - 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 device for a V-type engine, which is mainly devised in the arrangement of a surge tank.

[0002]

2. Description of the Related Art In a V-type engine, a plurality of cylinders are arranged in two rows and the cylinders have a V-shape when viewed from the front, and in the case of an engine having a large number of cylinders, it is advantageous for making the length direction compact. It is something. In such a V-type engine, an intake system including a surge tank downstream of the throttle valve, an independent intake pipe, etc. is usually provided in the space between the cylinder rows facing each other.

In such an intake system for a V-type engine, as a structure for increasing driving efficiency while achieving compactness, for example, as disclosed in Japanese Patent Laid-Open No. 62-210218, a surge tank is provided for each cylinder row. It has been proposed that the surge tank itself is formed into an annular shape by connecting the end portions of the surge tanks of each cylinder row so as to communicate with each other. By thus forming the surge tank in an annular shape, supercharging effects such as intake resonance and inertia can be obtained, and the V-type engine can be made relatively compact.

[0004]

By the way, in the case of applying the annular surge tank as described above, if further downsizing of the engine is attempted, various devices of the intake system are integrally connected to the annular surge tank. However, if this is done, the weight of the surge tank will be considerably large, and a biased load will be easily applied to the surge tank, and in particular, a relatively heavy throttle body will be connected to one end of the surge tank. However, there is a problem that it is difficult to dispose the surge tank in a stable state.

Therefore, it is conceivable to dispose a sturdy support structure for supporting the surge tank around the V-type engine. However, in this case, a large accommodating space for accommodating the support structure must be secured in the engine room. In addition to this, there is an inconvenience that the weight of the engine including the support structure becomes large.

The present invention has been made in order to solve the above-mentioned problems, and is structurally capable of sufficiently supporting the weight of various devices of the intake system coupled to the annular surge tank. It is an object of the present invention to provide a high-strength V-type engine intake device.

[0007]

In the intake system for a V-type engine according to claim 1 of the present invention, a pair of left and right surge tanks corresponding to the respective cylinder rows are provided above the pair of left and right cylinder rows of the V-type engine. The one end portion and the other end portion in the cylinder column direction of each of these surge tanks are connected to each other by a communication pipe on one end side and a communication pipe on the other end side to form an annular surge pipe, Directly attached to the outside of the center
In the intake system of the V-type engine configured so that intake air is supplied through the throttle valve body, each surge tank is provided with a plurality of independent intake pipes extending inward, and between the surge tanks. The independent intake pipes extending from one surge tank and the independent intake pipes extending from the other surge tank are alternately located in the substantially central portion, and the independent left and right
The pair of surge tanks and the communication pipes on the one end side and the other end side
A plurality of independent intake pipes that are integrally formed and that extend inward are connected to each of the surge tanks by integrally forming , and a plurality of independent intake pipes that extend to the inside of the surge tank are connected in series. one and independent intake pipe extending from the independent intake pipe and the other of the surge tank extending from the surge tank is located alternately in a substantially central portion between the surge tank, the upper
The above-mentioned connecting pipe with the throttle valve body directly attached
Plate-shaped inside the center, on the same plane as the annular surge tube
The connecting part of is integrally formed, and
Side and all of the above independent intake pipes are integrally connected to each other.
And the flan at the downstream end of each independent intake pipe.
The flange is integrally formed, and the plurality of independent
All of the intake pipes are connected together and the
Bolt hole for mounting to the intake manifold
At the same time, the plate-like connecting portion is
It is shaped to avoid the bolt holes

[0008]

[0009]

A V-type engine intake device according to a second aspect of the present invention is the V-type engine intake device according to the first aspect , wherein the throttle valve body is attached.
An on-off valve is provided on the communication pipe located on the opposite side of the existing communication pipe, and a boss portion that supports this on-off valve is integrally formed with the independent intake pipe.

[0011]

[0012]

According to a third aspect of the present invention, there is provided the intake system for a V-type engine according to the first or second aspect, wherein the upstream end portions of the pair of surge tanks are located in the cylinder column direction. Is set to the same position with,
Each independent intake pipe branching from one surge tank shall extend at a right angle to this surge tank, and the independent intake pipe branching from the other surge tank shall extend obliquely to this surge tank. It is characterized by.

According to a fourth aspect of the present invention, there is provided an intake system for a V-type engine according to any one of the first to third aspects, wherein the connecting portion and the manifold are provided.
A vacuum chamber is provided between the
The chamber is connected to the outer peripheral surface of the independent intake pipe and the connecting portion.
And the intake manifold .

According to a fifth aspect of the present invention, there is provided an intake system for a V-type engine according to any one of the first to fourth aspects, wherein the throttle valve body is connected to a communication pipe. volume chamber that bulges towards the inside of the annular surge tube is provided, said container Sekishitsu the communicating pipe
It is provided at a position offset from the center
In one of the additional gas passages that supply additional gas to the intake system
Throttle valve in the above throttle valve body
The bypass passage that introduces the air that bypassed the
It is characterized by being built .

[0016]

[0017]

[0018]

[0019]

According to the intake system for the V-type engine according to the first aspect of the invention, the independent intake pipes alternately branched from the respective surge tanks in opposite directions are adjacent to each other and integrally connected to each other. And, since at least the independent intake pipe located at one end side in the cylinder row direction is integrally coupled to the communication pipe, the unit including the surge tank and the annular surge pipe including the connecting pipe becomes compact, Moreover, the joint portion is reinforced and the rigidity is improved. Further, the connecting pipe on the one end side to which the throttle valve body is connected is reinforced, and the support rigidity of the throttle valve body is improved.

According to the intake system of the V-type engine of the first aspect, the independent intake pipe located on one end side in the cylinder row direction and the independent intake pipe located on the other end side are integrally connected to the respective communication pipes. Therefore, the rigidity of the surge tank including the independent intake pipe is further improved.

According to the intake system of the V-type engine according to the first aspect, the throttle valve body, because it is directly attached to the annular surge pipe, a throttle valve body and the annular surge tube is integrally connected This is also the case, and from this point also compactness and increased rigidity are realized.

According to the intake system of the V-type engine of the second aspect , an opening / closing valve is provided in the communication pipe located on the side opposite to the throttle valve side, and the boss portion supporting the opening / closing valve is an independent intake. Since it is connected to the pipe, this connection enhances the support rigidity for the on-off valve.

According to the intake system for the V-type engine of the third aspect, since the downstream end portions of the independent intake pipes branched from the respective surge tanks are arranged in a staggered manner in plan view, The independent intake pipes are sandwiched by the adjacent independent intake pipes on the left and right, and the individual intake pipes are tightly connected to each other, further improving the rigidity.

According to the intake system of the V-type engine of the third aspect , the bolt holes to the engine side are arranged in a staggered manner at the portions where the independent intake pipes are connected, so that the engine side bolt holes are arranged. The rigidity of the bolt fastening portion for connection is increased.

According to the intake system for the V-type engine of the third aspect, the positions of the upstream end portions of the pair of surge tanks are set at the same position in the cylinder row direction, and the surge tank is branched from one of the surge tanks. Since each independent intake pipe is extended at a right angle to this surge tank, and the independent intake pipe branched from the other surge tank is extended obliquely to this surge tank, It is possible to make the branch positions of the independent intake pipes the same, and in addition to the fact that the positions of the ends of the pair of surge tanks are set to the same position in the cylinder row direction, the intake is distributed to the cylinders. Can be made even. In addition, it is advantageous to make the intake passage length compact while ensuring the length. Furthermore, it is also advantageous for connecting the intake pipes to each other.

According to the intake system of the V-type engine of the fourth aspect , since the vacuum chamber is provided under the staggered independent intake pipe arrangement portion, the lower space is effectively used, and As a result, it is not necessary to separately provide a vacuum chamber around the engine, and the engine room can be made large.

According to the intake system for the V-type engine of the fifth aspect, the volume chamber bulging toward the inside of the annular surge pipe is provided at the portion where the throttle valve body is connected to the communication pipe. The blow-by gas sent into the intake air and the purge gas from the fuel tank are mixed in the volume chamber, so that the gas components in the intake air are made uniform and distributed evenly.

According to the intake system for the V-type engine of the fifth aspect , since the volume chamber is provided at a position offset from the central portion of the communication pipe, the independent chambers are located substantially at the central portion between the surge tanks. Interference with the intake pipe is avoided, and the intake device can be laid out more compactly.

According to the intake system of the V-type engine of the fifth aspect , since the additional gas passage for supplying the additional gas to the intake system is cast integrally with the volume chamber, the annular surge pipe is made more rigid. Can be large.

According to the intake system for the V-type engine of the fifth aspect , since the additional gas passage is a bypass passage for introducing air bypassing the throttle valve in the throttle valve body, it is necessary to provide a separate bypass passage. It realizes compactness and improves manufacturability.

[0031]

1 is a perspective view showing an example of an intake device for a V-type engine according to the present invention, FIG. 2 is a plan view thereof, and FIG.
Is a side view of the same, and FIG. 4 is a front view of the same. As shown in these drawings, in the present invention, as the engine E, a V-type engine in which a first cylinder bank E1 and a second cylinder bank E2 are arranged in parallel is applied. In this embodiment, each of the cylinder rows E1 and E
Each of the 2 is equipped with 3 cylinders. The first of these
The front view formed by the cylinder row E1 and the second cylinder row E2 is V
The intake device 1 according to the present invention is provided on the upper portion of the V-shaped valley.

In the intake system 1 of this embodiment, the first surge tank 11 is disposed above the first cylinder row E1 so as to extend in the front-rear direction, and the first surge tank 11 is disposed above the second cylinder row E2 in the front-rear direction. A second surge tank 12 arranged to extend,
The front communication pipe 13 that communicates the front portions of the first surge tank 11 and the second surge tank 12, the rear communication pipe 14 that communicates the rear portions thereof, and the dynamic effect of intake air provided in the front communication pipe 13 The on-off valve 2 to be controlled and the rear communication pipe 1
4, a throttle valve body 3 directly attached to the No. 4, an independent intake pipe group P provided in each of the first surge tank 11 and the second surge tank 12, and connected to the downstream side of the independent intake pipe group P. The intake manifold M has a basic structure. The first surge tank 11, the second surge tank 12, the front communication pipe 13, and the rear communication pipe 1
An annular surge pipe 1a is formed by 4 and 4.

The front portions of the surge tanks 11 and 12 are slightly bent upward as shown in FIGS. By doing so, a considerable gap is formed between the front communication pipe 13 and the front upper edge of the engine E on the front surface of the engine E, so that it is easy to inspect various sensors and extract the radiator liquid. In addition, the introduction of the air from the gap improves the cooling effect of the intake device 1 as a whole.

The upstream end portions of the first surge tank 11 and the second surge tank 12, that is, the rear communication pipe 14
The joint points with both end portions of the are set at the same position in the front-rear direction. The throttle valve body 3 is connected to a substantially central portion of the rear communication pipe 14. Therefore, since the distance until the intake air reaches the first surge tank 11 and the second surge tank 12 is the same, the amount of intake air distributed to the first surge tank 11 and the second surge tank 12 is even. Become.

The on-off valve 2 is for controlling the natural frequency of intake air in the annular surge pipe 1a. When the natural frequency of the intake air matches the pressure vibration of the engine E, the supercharging efficiency increases. Therefore, the on-off valve 2 is automatically opened / closed according to the number of revolutions of the engine E, and the above-mentioned natural vibrations occur in a plurality of rotational speed ranges. The number and pressure oscillation are set to match.

Each of the first surge tank 11 and the second surge tank 12 is provided with three left independent intake pipe groups P1 and three right independent intake pipe groups P2 on the arc surfaces facing each other with a slight positional deviation. Has been. The left independent intake pipe group P1 includes a left first independent intake pipe P11, a left second independent intake pipe P12, and a left third independent intake pipe P13 from the front side, and the right independent intake pipe group P2 includes a right first intake pipe group P2. It is composed of an independent intake pipe P21, a right second independent intake pipe P22, and a right third independent intake pipe P23.

Each of the independent intake pipe groups P is curved downward on the downstream side and is connected to the intake manifold M via a flange 41. Intake manifold M
Are located between the independent intake pipe P and the engine E to form a downstream independent intake pipe group.

Left independent intake pipe group P1 arranged in this manner
The respective pipes P11, P12, P13 of the above and the respective pipes P21, 22, 23 of the right independent intake pipe group P2 are dimensioned so as to intersect each other in the central portion.
Therefore, as shown in FIG. 2, the left independent intake pipe group P1 and the right independent intake pipe group P2 are staggered at the respective bent portions.

In the present embodiment, all of the left first independent intake pipe P11, the left second independent intake pipe P12, and the left third independent intake pipe P13 forming the left independent intake pipe group P1 have the first surge. The layout is set so as to extend linearly from the inner peripheral surface of the tank 11 toward the second surge tank 12, whereas the right first independent intake pipe P21 and the right second independent intake pipe P22 extend from the surge tank 12. Also, the right third independent intake pipe P23 is set to have a diagonal layout.

By making such a layout setting, the branch point of the left independent intake pipe group P1 for the first surge tank 11 and the branch point of the right independent intake pipe group P2 for the second surge tank 12 face each other. Because the first
The intake air in the surge tank 11 and the second surge tank 12 is evenly distributed to the left independent intake pipe group P1 and the right independent intake pipe group P2. Moreover, the independent intake pipe groups P are arranged in a staggered manner at the respective bending points, which is effective in making the annular surge pipe 1a compact.

However, as described above, the left independent intake pipe group P1
Is linearly arranged and the right independent intake pipe group P2 is obliquely arranged, the right independent intake pipe group P2 becomes longer than the left independent intake pipe group P1, so that the intake passage lengths become uneven for each cylinder. In order to avoid the above, the intake manifold M is arranged reversely to the above, the downstream independent intake pipes related to the left independent intake pipe group P1 are diagonally arranged, and the downstream independent intake pipes related to the right independent intake pipe group P2 are linear. The arrangement is preferable.

In such an independent intake pipe group P, all the pipes P11 to P are provided at the substantially central portion inside the annular surge pipe 1a.
23 are connected to each other. Specifically, the independent intake pipes P11 to P23 are connected to each other at adjacent portions, and the plate-shaped connecting portion 4 is provided integrally with the intake pipes P11 to P23 between the intake pipes P11 to P23. . As a result, the annular surge pipe 1a is structurally very sturdy.

As shown in FIGS. 2 and 3, the flange 41 provided at the connecting portion between the lower end of each of the intake pipes P11 to P23 and the upper end of the manifold M, which is a downstream independent intake pipe group, is Seven bolt boss portions 43 are provided on both sides in the width direction in a zigzag manner, and bolts 43a are inserted into and screwed into bolt holes provided in the bolt boss portions 43 to connect the intake pipes P11 to P23 and the manifold M to each other. It is connected. By staggering the bolt boss portions 43, the fastening rigidity of the connecting portion 4 is improved.

A boss portion 15 that supports the shaft of the on-off valve 2 is interposed between the front outer wall portion of the left first independent intake pipe P11 and the on-off valve 2 so that they are integrally connected. .
Therefore, the independent intake pipe group P is integrally connected to the front communication pipe 13 and the rear communication pipe 14 in the front and rear thereof, so that the integrated connection state of the independent intake pipe group P to the annular surge pipe 1a becomes stronger. Has become.

The ISC pipe 16 bypassing the inside of the throttle valve body 3 is integrally manufactured by casting. The ISC pipe 16 extends upward from the lower portion of the annular surge pipe 1a and reaches the volume chamber 33 described below. Air is introduced to the ISC pipe 16 from the upstream side of the throttle valve body 3 via a pipe through a passage in the intake manifold M. Thus, by casting the ISC pipe 16 integrally with the independent intake pipe of the annular surge pipe 1a,
The rigidity is improved, the manufacturability is improved, and the transmitted sound of the opening / closing sound generated when the ISC valve is opened / closed is reduced.

An intake pipe 31 is connected to the rear portion of the throttle valve body 3, and the intake air introduced into the throttle valve body 3 through the intake pipe 31 is supplied by a throttle valve (not shown) provided inside. The flow rate is controlled and supplied into the annular surge pipe 1a.

A blow-by gas pipe 32 is connected to a volume chamber 33, which will be described later, formed at a connecting portion between the throttle valve body 3 and the rear communication pipe 14, and blow-by gas leaked from the cylinder is supplied to the engine E. It is supposed to be refluxed. The blow-by gas pipe 32 is connected to the lower portion of the volume chamber 33, and this connecting portion plays a role of draining water condensed in the annular surge pipe 1a, and prevents water from entering the throttle valve body 3. is doing.

A purge gas pipe 17 is connected to the ISC pipe 16 so that the purge gas leaked from the fuel tank is introduced into the rear communication pipe 14 of the annular surge pipe 1a via the ISC pipe 16. .

Although one throttle valve body 3 is provided for the annular surge pipe 1a in the present embodiment, the present invention is not limited to one throttle valve body 3. Instead, two throttle valve bodies may be arranged in parallel for the first surge tank 11 and the second surge tank 12.
However, in this case, it is preferable to connect the communication pipes connected to the two throttle valve bodies with a rib so as to increase the structural strength.

On the front side of the throttle valve body 3 and at the connection portion with the rear communication pipe 14, a front projection 34 that protrudes forward from the outer peripheral surface of the rear communication pipe 14 in a state where a spherical surface is formed. Is formed integrally with the rear communication pipe 14, and inside the front protruding portion 34, as shown in FIG. 3, a volume chamber 33 having a concave inner peripheral surface is formed. The reason why such a volume chamber 33 is provided is that the bypass intake air, the purge gas and the blow-by gas are introduced into the throttle valve body 3 through the ISC pipe 16, the purge gas pipe 17 and the blow-by gas pipe 32. This is because it is possible to prevent the intake air from being uniformly supplied due to these drifts.

That is, the bypass intake air, the purge gas and the blow-by gas introduced into the throttle valve body 3 are guided to the concave shape of the inner wall surface of the volume chamber 33 to be a vortex and are well mixed, so that the intake air is uniformly distributed. Will be carried out. In addition, the front protrusion 34
Is bulged toward the front side of the rear communication pipe 14, which makes it possible to make the intake device 1 more compact, and by this bulging, the right third independent intake pipe P23 and This is because the overall rigidity strength of the air intake device 1 is increased by making the distance of (3) closer via the connecting portion 4.

By slightly shifting the throttle valve body 3 from the central portion of the rear communication pipe 14, the right third independent intake pipe P23 and the front protrusion 34 of the throttle valve body 3 do not interfere with each other, and the intake air The device 1 can be made more compact.

An idle adjusting air passage 18 is connected to the front protrusion 34. The idle adjusting air passage 18 is connected to a hose (not shown) led out from the throttle valve body 3, and a predetermined flow rate of air is supplied through the idle adjusting air passage 18 during idling. .

In this embodiment, the ISC
The pipe 16 is formed integrally with the independent intake pipe group P by casting aluminum. By doing so, it is possible to reduce the manufacturing cost and also contribute to the reduction of the operation noise of the ISC valve that is transmitted from the inside of the ISC pipe 16 to the outside.

A vacuum chamber 5 is provided in the space between the independent intake pipe group P and the intake manifold M (not shown). Specifically, between independent ventilation P1
2, the outer peripheral surface of P22 and the connecting portion 4 form a downwardly open space surrounded by the upper surface portion and the periphery thereof, while forming an upward space on the intake manifold side, which together form the vacuum chamber 5. It has been done.

The vacuum chamber 5 is used as a negative pressure source for actuating various actuators using negative pressure, and a dedicated one is usually installed in the peripheral portion of the annular surge pipe 1a. In the present invention, attention is paid to the above space portion, and the vacuum chamber 5 is provided in this portion.
Was formed. By doing so, it is possible to effectively utilize the space portion, and it is possible to make the intake device 1 more compact.

In the present embodiment, as shown by the chain double-dashed line in FIG. 2, a negative pressure type actuator 7 for opening and closing the on-off valve 2 is attached to the front communication pipe 13, and this actuator 7 is provided with a vacuum chamber 5. Negative pressure is supplied via the three-way valve 72 and the negative pressure pipe 71. The opening / closing operation of the opening / closing valve 2 is performed by the operation of the actuator 7.

Then, the actuator 7 and the negative pressure tube 7
1, the three-way valve 72, the ISC passage 16, the idle adjusting air passage 18, the throttle valve body 3, and other accessories are linearly arranged in the cylinder column direction at the center of the annular surge pipe 1a to balance the arrangement of the accessories. Good stuff.

The fuel supply system for the intake system may be a carburetor, but may be equipped with a fuel injection device for injecting fuel from the injector to the intake manifold of each cylinder. The case where the device is equipped will be described. In this case, as shown by the chain double-dashed line in FIG. 2, the fuel distribution pipe 6 which is a circulation passage for the liquid fuel is arranged inside the annular surge pipe 1a.

Fuel is supplied to the fuel distribution pipe 6 from a fuel tank (not shown) through the fuel pipe 62 and the pulsation damper 63, and injectors provided corresponding to the respective cylinders. It is designed to be injected from 61. The surplus fuel is returned to the fuel tank via the pressure regulator 64.

By disposing the fuel distribution pipe 6 in an annular shape inside the annular surge pipe 1a, the fuel distribution pipe 6 is isolated from the intermediate pipe of the exhaust system, and the liquid in the fuel distribution pipe is affected by the exhaust heat. The fuel temperature is prevented from rising.

The fuel distribution pipe 6 has an injector 61.
It is arranged so as to pass through the side of. By doing so, the fuel passage in the fuel distribution pipe 6 can be brought closer to the inside of the injector 61 as compared with the fuel distribution pipe 6 arranged so as to pass above the injector 61. Fuel passing through 6 is injector 6
1 It is possible to take away heat inside and contribute to cooling. By arranging the fuel distribution pipe 6 and the injector 61 as described above, it is possible to effectively prevent the generation of vapor in the fuel supplied to the injector 61, and it is possible to reliably prevent the fluctuation of the fuel supply amount. Like

Further, the fuel distribution pipe 6 is the annular surge pipe 1a.
Since it is surrounded by the fuel distribution pipe 6
Can be effectively protected. In addition, the space surrounded by the annular surge pipe 1a is effectively used, a space is obtained in the engine room, and the appearance of the engine E is improved.

[0064]

As described in detail above, the intake system for the V-type engine of the present invention is connected to each surge tank and each end in the cylinder column direction, which are provided at the upper part of the pair of left and right cylinders of the V-type engine. In the intake device of the V-type engine configured so that intake air is supplied to the annular surge pipe formed by the connected communication pipe through the throttle valve body, each surge tank has a plurality of inward extending parts. Independent intake pipes are continuously provided, and in a substantially central portion between both surge tanks, independent intake pipes extending from one surge tank and independent intake pipes extending from the other surge tank are alternately positioned.
Adjacent independent intake pipes are integrally connected to each other, and at least the independent intake pipe located at one end side in the cylinder row direction is integrally connected to the communication pipe, and the throttle valve body is connected to the communication pipe on the one end side. It will be.

Therefore, the unit including each surge tank and the annular surge pipe consisting of the connecting pipe becomes compact, and the joint portion is reinforced to increase the rigidity. Further, the connecting pipe on the one end side to which the throttle valve body is connected is reinforced, and the support rigidity of the throttle valve body is improved.

Further, if the independent intake pipe located on one end side in the cylinder row direction and the independent intake pipe located on the other end side are integrally connected to the respective communication pipes, the rigidity of the surge tank including the independent intake pipe is further increased. improves.

If the throttle valve body is directly attached to the annular surge pipe, the throttle valve body and the annular surge pipe are integrally connected, and the rigidity is improved from this point as well.

Further, if an opening / closing valve is provided in the communication pipe located on the side opposite to the throttle valve side and the boss portion supporting this opening / closing valve is connected to the independent intake pipe, this connection enhances the support rigidity for the opening / closing valve. To be

Further, by arranging the downstream end portions of the independent intake pipes branched from the respective surge tanks in a zigzag manner in plan view, the independent intake pipes are sandwiched by the left and right adjacent independent intake pipes. In this state, the connection state between the independent intake pipes becomes tight and the rigidity is further improved.

Further, a connecting portion for integrally connecting the independent intake pipes at the downstream end side is provided, and a bolt hole for fixing each surge tank to the upper portion of the engine is provided at the connecting portion, and the bolt hole is formed in a staggered shape. If it is arranged at, the rigidity of the bolt fastening portion for connection to the engine side can be increased.

Further, the positions of the upstream end portions of the pair of surge tanks are set to the same position in the cylinder row direction, and the independent intake pipes branched from one surge tank are extended substantially at right angles to the surge tank. However, if the independent intake pipe branching from the other surge tank is installed diagonally with respect to the surge tank, the branch positions of the independent intake pipes from both surge tanks can be made the same. The fact that the positions of the end portions of the cylinders are set to the same position in the cylinder row direction makes it possible to evenly distribute the intake air to each cylinder row. In addition, it is advantageous to make the intake passage length compact while ensuring the length. Furthermore, it is also advantageous for connecting the intake pipes to each other.

Further, if a vacuum chamber is provided below the staggered independent intake pipe arrangement portion, the above lower space can be effectively used, and as a result, it is not necessary to separately provide a vacuum chamber around the engine, and the engine room can be spared. It can be anything.

If a volume chamber bulging toward the inside of the annular surge pipe is provided at the portion where the throttle valve body is connected to the communication pipe, the blow-by gas sent into the intake air and the purge gas from the fuel tank will have a large volume. Advantageously, the fuel components in the intake air are mixed and the fuel components in the intake air become uniform and evenly distributed.

Further, if the volume chamber is provided at a position offset from the central portion of the communication pipe, interference with the independent intake pipe located substantially in the central portion between the surge tanks is avoided, and the intake device is laid out more compactly. It becomes possible to do.

Furthermore, if the additional gas passage for supplying the additional gas to the intake system is cast integrally with the volume chamber, the annular surge pipe can be made more rigid.

In addition, if the additional gas passage is used as a bypass passage for introducing air that bypasses the throttle valve in the throttle valve body, it is not necessary to provide a separate bypass passage, and it is possible to make the device compact and improve manufacturability.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of an intake device for a V-type engine according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a side view of FIG.

FIG. 4 is a front view of FIG.

[Explanation of symbols]

1 Air intake device 11 First surge tank 12 Second surge tank 13 Front communication pipe 14 Rear communication pipe 15 Boss 16 ISC tube 2 open / close valve 3 Throttle valve body 31 Intake pipe 32 blow-by gas pipe 33 Volume chamber 34 Front protrusion 4 connection 41 flange 5 vacuum chamber 6 Fuel distribution pipe E engine E1 1st cylinder row E2 surge tank P Independent intake pipe group P1 Left independent intake pipe group P2 Right independent intake pipe group P11 Left first independent ventilation pipe P12 Left second independent ventilation pipe P13 Left third independent ventilation pipe P21 Right first independent ventilation pipe P22 Right second independent ventilation pipe P23 Right third independent ventilation pipe M intake manifold

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI F02M 35/10 301P 301S 301T (72) Inventor Taeko Sugimoto 3-3 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda Corporation (72 ) Inventor Koji Kimura 3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture (56) Reference JP-A-3-149326 (JP, A) JP-A-59-115460 (JP, A) Special Kai 62-210218 (JP, A) Actual Kaihei 3-25852 (JP, U) Actual Kaihei 2-52955 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F02M 35 / 10 F02B 27/00

Claims (5)

(57) [Claims] 1. A pair of left and right surge tanks corresponding to each cylinder row are provided above a pair of left and right cylinder rows of a V-type engine, and one end portion and the other end portion in the cylinder row direction of each of these surge tanks have one end side. An annular surge pipe is formed by being connected to each other by a communication pipe and a communication pipe on the other end side, and via a throttle valve body directly attached to the outside of the center of the communication pipe on the one end side. In the intake system of a V-type engine configured to supply intake air by means of a plurality of independent intake pipes extending inward, each surge tank is connected in series, and one of the surge tanks is provided with one of the independent intake pipes at a substantially central portion between the surge tanks. Independent intake pipes extending from the surge tank and independent intake pipes extending from the other surge tank are alternately located, and the pair of left and right surge tanks and the one end side and the other end side
With the communicating pipe is integrally formed of, for each of the surge tank a plurality of independent intake pipes extending laterally inside is continuously provided by integral forming, the communicating pipe the throttle valve body is directly attached
Inside the approximate center of the plate, the plate should be on the same plane as the annular surge pipe.
A connecting portion is formed integrally, and the inside of the substantially central portion of the communication pipe and the plurality of independent intake pipes are
All are integrally connected to each other, and a flange is integrally formed on the downstream end of each independent intake pipe.
Is, all of the plurality of independent intake pipe by the said flange
In addition to being integrally connected to each other, the above flange is attached to the intake manifold by bolts.
A hole is provided, and the plate-shaped connecting part has a shape that avoids the bolt hole in plan view.
Intake device for V-type engine characterized by being shaped like 2. The throttle valve body is attached
With closing valve is provided in the communicating pipe on the opposite side of the communicating pipe are, according to claim 1, wherein a boss portion for supporting the on-off valve is integrally formed with the independent intake pipe V-type engine intake device. 3. The positions of the upstream end portions of the pair of surge tanks are set at the same position in the cylinder row direction, and
Each independent intake pipe branching from one surge tank shall extend at a right angle to this surge tank, and the independent intake pipe branching from the other surge tank shall extend obliquely to this surge tank. The intake system for a V-type engine according to claim 1 or 2, wherein . 4. A valve between the connecting portion and the manifold.
A vacuum chamber is provided, and the vacuum chamber is provided.
Is the outer peripheral surface of the independent intake pipe, the connecting portion, and the intake air.
Characterized by being formed by a manifold
Intake of the V-type engine according to any one of claims 1 to 3.
Equipment . 5. A volume chamber bulging toward the inside of the annular surge pipe is provided at a portion where the throttle valve body is connected to the communication pipe, and the volume chamber is located at a position offset from a central portion of the communication pipe.
It is installed in the
Inside the throttle valve body, which is one of the additional gas passages
Introduce air bypassing the throttle valve of
The intake device for a V-type engine according to any one of claims 1 to 4 , wherein the pass passage is integrally cast .