JP3337305B2 - Engine intake device and its core structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, an intake manifold for a V-type engine, an intake device for an engine such as a core used when gravity- casting the intake manifold, and a core structure thereof.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Application Laid-Open Nos. 2-104917 and 2-102 disclose an intake device for a V-type engine.
No. 322 is disclosed. The former JP-A-2-1
In the intake device described in Japanese Patent No. 04917, a communication path that branches from the intake port to both banks and that communicates with the collecting section of each bank on the opposite side of the collecting section (corresponding to a surge tank) from the intake port is provided. It is provided.

[0003] In the latter, the intake device described in Japanese Patent Application Laid-Open No. 2-102322 branches from the intake port to both banks, and connects the collective portion of each bank to the opposite side of the collective portion of both banks. A communication passage is provided, and a valve, for example, a VRIS (Variable Resonance Ind.
Auction system, variable resonance supercharging system) is provided with a communication control valve as a valve.

[0004] By the way, when casting such a suction device having a hollow shape, a shell mold is generally used.
In this case, a core for forming the inner surface of a casting (intake device of a V-type engine) and a core support for supporting the core are required.

However, in the conventional core structure, the core support is provided at a position irrelevant to the opening which is indispensable to the intake device, and the weight is heavy.
Due to the force casting, an unnecessary hole was formed in the suction device after casting, and this unnecessary hole had to be closed with a plug.

Therefore, there is a problem that an unnecessary step such as an unnecessary step of closing a hole by a plug is required for manufacturing the intake device.

[0007]

BACKGROUND INVENTION It is an object to be solved] The inventions, by effectively utilizing the portion corresponding to the large holes in the necessary and relatively open area in the intake system after casting by arranging the core support section, the medium separately without forming a child support hole, stable support of the core is achieved during casting, the aim of omission of blocking step of the hole by a plug, it is easy to manufacture the intake system, also <br/> air inlet Is formed, a portion where an opening for a communication control valve (VRIS valve) is formed in a collecting portion of one bank, and a gas inlet (for example, a cooling By placing core supports at the part where the gas introduction port for introducing the catalyst temperature at the time of start-up is formed,
Due to the uniform arrangement of the core supports, the core can be more reliably and evenly supported during casting , and
By bisecting the core at a predetermined site, after easy to manufacture the core of complex shape, by a divided structure in a predetermined portion, engine weight distribution of 2 divided core is substantially equal To provide a core structure for an air intake device.

In one embodiment of the present invention, the communication control valve opening forming portion is provided corresponding to a portion where an offset space is formed between the independent intake passage and the communication passage in the above-mentioned gathering portion of the one side bank. Thereby, a sufficient cross-sectional area of the core supporting portion provided in the communication control valve opening forming portion can be secured, and the core supporting portion can improve the support of the core by the core supporting portion. It is intended to provide a core structure for a device.

[0009] The invention also provides additional gas distribution property in the intake system of the engine which is cast using a core structure of the configuration is required (e.g. for air ISC, EGR gas)
It is an object of the present invention to provide an intake device for an engine that does not impair the distribution of the additional gas by forming the intake port of the intake port at the intake port.

[0010]

An engine according to the present invention .
The core structure for an intake system of the branches from the intake inlet on both banks, with communication passage for intercommunicating the set portion of each bank opposite the suction inlet port side of the collecting portion of the both banks are provided, the
A core structure for an intake system of the engine casting intake system for a V-type engine which communication control valve for opening and closing the communication passage is provided, disposed in a set of one side bank by the upper Symbol air inlet opposite A communication control valve opening forming part, a gas inlet forming part provided in the above-mentioned collecting part of the other bank for introducing gas having no distribution effect, and a core for supporting a core in the above-mentioned intake introducing part forming part supporting portion arranged respectively, and an intermediate position of the intake air introduction port forming portion, in which the core is divided into two parts and an intermediate position of the communication control valve opening forming portions as respective division plane.

In one embodiment of the present invention, the communication control valve opening forming portion is a one-side bank in which an offset space is formed between the independent intake passage and the communication passage on a side opposite to the intake port. those provided corresponding to the offset space forming portion in the collecting portion.

[0012] intake system of the engine according to the invention is a suction device of an engine which is cast using a core structure of the above arrangement, the additional gas inlet distributor is required to form on the intake air introduction port Things .

[0013]

According [Operation and Effect of the Invention] This inventions, intake air introduction port forming portion of the above-described support core to the gas introduction port forming portion and the valve arrangement設用opening forming portion provided in a set of both banks core Since the supporting portions are respectively arranged, the above-described intake inlet, gas inlet, and valve arrangement opening are necessary and relatively large in opening area for the intake device after casting. The supporting cross-sectional area can be increased.

As a result, the core can be stably supported at the time of casting without separately forming a core support hole, and an unnecessary step of closing the hole with a plug can be omitted. This has the effect of facilitating the manufacture of the intake device.

In addition , since the core supporting portions are respectively arranged in the above-described intake inlet forming portion, the communication control valve opening forming portion of one bank, and the gas introducing port forming portion of the other bank, the core support portion is provided at the time of casting. Therefore, there is an effect that the above-mentioned cores can be more reliably and evenly supported by these core supporting portions.

In addition, the above-mentioned gas inlet forming portion of the other bank is provided with a gas having no influence on the distribution, for example, the engine speed after the ISC air is introduced for the purpose of increasing the catalyst temperature during cold start. Since the gas is supplied in a stable state, so-called AWS, there is no concern that the performance of the intake device and the engine after casting will be impaired.

[0017] Moreover, an intermediate position of the intake air introduction port forming portion of the above, since the 2 dividing the core comprises a core support section and an intermediate position of the communication control valve opening forming portions described above as respective division surfaces, In addition to facilitating the manufacture of a core having a complicated shape, by dividing the core at the above-described predetermined portion, the weight distribution of the divided core becomes substantially equal, and the core support by the core support portion is stabilized. There is.

According to this embodiment, since the communication control valve opening forming portion of the upper predicate it provided corresponding to the offset space forming portion, enough of the core support section provided in the communication control valve opening forming portion Thus, there is an effect that the core supporting portion can improve the support stabilization of the core.

According to the intake system for an engine of the present invention,
Additional gas distribution is required in the intake system of the engine which is cast using a core structure of the above configuration (e.g., IS
Since the inlet for the C air and the EGR gas is formed in the above-mentioned intake inlet, the additional gas introduced from the additional gas inlet can be evenly distributed to both banks, and the distribution of the additional gas can be improved. There is an effect that does not impair.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. Before describing the core structure for the intake system of the engine, the structure of the intake system of the V-type 6-cylinder engine will be described first in detail, as shown in FIGS. 6, 7 and 8. 1 branches from an intake inlet 3 having a throttle body mounting seat 2 at one end into one bank B1 and the other bank B2, and is provided with anti-intake air from the collecting portions 4 and 5 corresponding to surge tanks of both banks B1 and B2. On the inlet side, a communication path 6 is provided for interconnecting the collecting parts 4 and 5 of the banks B1, B2.

The above-mentioned collecting portions 4 and 5 corresponding to surge tanks have independent intake passages 7 and 8 for three cylinders, respectively.
9, 10, 11, and 12 are integrally formed, and a mounting seat 13 (see FIGS. 7 and 8) that is mounted on the intake manifold is integrally formed at a downstream end of each of the independent intake passages 7 to 12 . .

Further, the independent intake passage 9 of one bank B1 is provided.
An offset space 14 is formed between the intake passage 3 and the communication passage 6, and the collecting portion 4 of the one-side bank B 1 on the opposite side to the intake port 3 and corresponding to the offset space 14.
As shown in FIG. 7, a communication control valve opening 15 and a communication control valve mounting seat 16 are formed on the end side of the.

Here, the above-mentioned communication control valve is a VRIS (Variable Resonance Induction System,
Variable resonance supercharging system) valve.

On the other hand, at a position near the intake port 3 in the collecting portion 5 of the other bank B2, there are formed an inlet port 17 for introducing gas having no influence on the distribution and a mounting seat 18.

Here, the above-mentioned gas having no influence on the distributing property is, specifically, an ISC (idle speed control) air for the purpose of increasing the catalyst temperature of the exhaust system at the time of the cold start. This is a so-called AWS supplied in a stable state of the engine speed after the start.

Further, the above-mentioned intake port 3 is provided with an additional gas inlet port 19 which is required to be distributed. The additional gas requiring this distribution is, for example, for ISC or EGR.
Gas.

Next, with reference to FIGS. 1 to 5, a core structure for an intake device of a V-type engine used for casting the above-described intake device 1 for a V-type engine will be described in detail.

The core 21 is branched from the intake inlet forming part 23 forming the intake inlet 3 into the two banks B1 and B2, and the one bank B1 is provided with the collecting part forming part 24 forming the collecting part 4. , The aggregate portion 5 is formed in the other bank B2.
The gathering part forming parts 25 are integrally formed.

In addition, independent air passage forming portions 27, 28, 29, 30, 31, 32 for forming the above-mentioned independent air passages 7 to 12 are integrally formed with the above-mentioned gathering portion forming portions 24, 25. I have.

Further, the communication passage 6 is provided on the side opposite to the intake inlet forming section 23 in the above-mentioned collecting section forming sections 24 and 25.
Are formed integrally with each other.

In addition, the core support 33 is formed integrally with the above-described intake inlet forming portion 23, and the core support 35 is formed on the communication control valve opening forming portion 34 for forming the communication control valve opening 15. And the above-described gas inlet 1
The core support 37 is formed integrally with the gas inlet forming portion 36 for forming the gas inlet 7, and the core support 38 (see FIG. 2) is formed integrally with the lower portion of each of the independent intake passage forming portions 27 to 32 described above . Has formed.

Here, the above-mentioned communication control valve opening forming portion 34 is provided.
Are formed so as to correspond to the offset space forming portion α corresponding to the above-mentioned offset space 14, and the above-mentioned core 21 and each of the core supporting portions 33, 35, 37, 38 are formed in the shell as apparent from FIG. It is integrally formed in a hollow shape by a core [core formed into a shell shape using sand (resin sand) mixed with calcinate synthetic resin powder].

As shown in FIGS. 4 and 5, the core 21 has a dividing surface 39 for dividing the intermediate position of the intake port forming portion 23 and the intermediate position of the communication control valve opening forming portion 34, respectively. , 40 are divided into two parts including the corresponding core support parts 33, 35.

Next, the structure of the mold will be described with reference to FIGS. 1 to 3.
An upper mold 41 and a lower mold 42 that support the core 21 via 7, 38 are provided, and these upper and lower molds are formed of a sand mold made of resin sand. A cavity 43 corresponding to the thickness of the intake device 1 is formed in the upper mold 41 and the lower mold 42, and a shape surface 44 for forming the throttle body mounting seat 2 and the communication control valve mounting seat 16 are formed. And a shape surface 46 for forming the mounting seat 18 for the gas inlet 17 are formed.

The lower mold 42 has two disposal molds 47 and 48.
The shape surface 49 for forming the mounting seat 13 is formed using FIG. 3 (see FIG. 3) , and the upper mold 41 and the upper and lower molds are connected to the cavity 43 so as to communicate with the cavity 43, respectively. , Pouring gate (gate) 50, vertical pouring gate (spru)
e) 51, a runner 52, and an air vent hole (gas vent hole) 53 are formed.

In order to gravity- cast the intake device 1 of the V-type six-cylinder engine using the above-described core 21 and mold, the molten metal of aluminum or aluminum alloy is poured into the above-described pouring port. When the molten metal is poured from the mold 50, the molten metal flows into the cavity 43, and gas generated during the molten metal is extracted from the air vent hole 53 to the outside of the mold. As shown in FIGS. 6, 7 and 8, the intake device 1 for a V-type six-cylinder engine can be cast. That is, the above-described mold cavity 43 forms the outer surface of the suction device, and the above-described core 21 forms the inner surface of the suction device 1. In addition, the additional gas inlet 1 described above is used.
9 is pierced and formed after the casting of the intake device 1.

By the way, the above-mentioned intake inlet forming section 23
When, was placed a core support section 33,37,35 supporting the both banks B1, the gas introduction port forming portion 36 provided in the collecting portion 4, 5 of the B2 and the communication control valve opening forming portion 34 and the core 21, respectively Therefore, the above-described intake inlet 3, gas inlet 17 ,
Since the communication control valve opening 15 is necessary for the intake device 1 after casting and has a relatively large opening area, the core support portions 33, 37, 35 corresponding to these portions (however, the portions 23, 36,
34 inclusive) can be increased.

As a result, the core 21 can be stably supported at the time of casting without separately forming a core support hole, and an unnecessary step of closing a hole with a plug as in the related art can be omitted. This has the effect of facilitating the manufacture of the intake device 1.

Core support portions 33 and 35 are provided in the above-described intake inlet forming portion 23, the communication control valve opening forming portion 34 of one bank B1, and the gas inlet forming portion 36 of the other bank B2, respectively. , 37 are arranged, so that there is an effect that the above-mentioned core 21 can be more reliably and evenly supported by the respective core support portions 33, 35, 37 during casting.

Further , the gas inlet forming portion 36 of the other side bank B2 is a gas having no influence on the distribution, for example, the engine after the ISC air is injected for the purpose of increasing the catalyst temperature at the time of the cold start. Since the gas is supplied in a so-called AWS state under a stable rotational speed, there is no concern that the performance of the intake device 1 and the engine after casting are impaired.

[0041] Moreover, an intermediate position of the intake air introduction port forming portion 23 mentioned above, the core support section 33 and an intermediate position of the communication control valve opening forming portion 34 mentioned above as respective division surfaces 39 and 40,
Since the core 21 is divided into two parts including the core 35, the production of the core 21 having a complicated shape becomes easy, and the weight distribution of the divided core 21 is substantially reduced by dividing the core 21 at the above-mentioned predetermined portion. It becomes even and the core 2 by the core support parts 33, 35, 37
1 has the effect of stabilizing the support.

[0042] In addition, also since the communication control valve opening forming portion 34 mentioned above is provided in correspondence with the offset space 14 forming portion, enough of the core supporting portion 35 provided in the communication control valve opening forming portion 34 Thus, there is an effect that the core support portion 35 can improve the support stabilization of the core 21.

On the other hand, the intake system for the engine of the above embodiment
Is an intake device of a V-type six-cylinder engine cast using the above-mentioned core structure, and the inlet 19 of an additional gas (for example, air for ISC, EGR gas) which is required to be distributed is connected to the intake inlet 3, the additional gas inlet 19
Can be evenly distributed to both banks B1 and B2, and there is an effect that the distribution of the additional gas is not impaired.

In correspondence between the configuration of the present invention and the above-described embodiment, the engine intake device of the present invention
Corresponding to the intake device 1 of a 6-cylinder engine.
The core supporting portion disposed in the intake inlet forming portion includes the portion 23
The core support portion corresponding to the core support portion 33 including the core control portion and the core support portion disposed at the communication control valve opening forming portion corresponds to the core support portion 35 including the portion 34 and disposed at the gas inlet port formation portion. core support section corresponds to the core support section 37 including the portion 36, the communication control valve corresponds to the VRIS valve, gas is no influence of the distributivity corresponds to AWS, distributivity is required Additional gas
Although the present invention corresponds to an ISC gas or an EGR gas, the present invention is not limited to only the configuration of the above-described embodiment.
For example, V8, V10, V12 other than V6 engine
Needless to say, the present invention may be applied to an intake device of a V-type multi-cylinder engine and a core structure thereof.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state in which a core structure for an intake device of a V-6 engine according to the present invention is set in a mold.

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

FIG. 3 is an enlarged sectional view taken along line YY of FIG. 1;

FIG. 4 is a plan view showing a core structure for an intake device.

FIG. 5 is an exploded plan view of the core structure.

FIG. 6 is a plan view of an intake device of a V-type six-cylinder engine cast using the same core structure.

FIG. 7 is a side view of the intake device.

FIG. 8 is a sectional view taken along line ZZ of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Intake device 3 ... Intake introduction port 4, 5 ... Collecting part 6 ... Communication path 14 ... Offset space 15 ... Communication control valve opening 17 ... Gas introduction port 19 ... Additional gas introduction port 21 ... Core 23 ... Intake introduction port formation Part 29 ... Independent intake passage forming part 33,35,37 ... Core support part 34 ... Communication control valve opening forming part 36 ... Gas inlet forming part 39,40 ... Division surface B1 ... One bank B2 ... Other bank α … Offset space formation site

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-281922 (JP, A) JP-A-3-149326 (JP, A) JP-A-62-110218 (JP, A) Jpn. 10266 (JP, U) Actually open 1953-9914 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F02M 35/104 F02B 27/02 B22C 9/10 B22C 9/22

Claims (3)

(57) [Claims] 1. A communication path which branches from an intake port to both banks, and a communication path for interconnecting the collection section of each bank is provided on the opposite side of the collection section of both banks to the intake port, and the communication path is opened and closed.
A core structure for an intake device of an engine for casting an intake device of a V-type engine provided with a communication control valve to be provided , provided at a collecting portion of one bank on the side opposite to the intake port.
Provided in the communication control valve opening forming portion and the above-mentioned gathering portion of the other bank, there is no influence on the distribution.
A core support for supporting the core is provided at the gas inlet forming section for introducing the new gas and the intake forming section.
And the intermediate position of the intake port forming section and the communication control valve open.
The above-mentioned core is used as a dividing surface with the intermediate position of the mouth forming portion as each dividing surface.
Is a core structure for an intake device of an engine divided into two parts . 2. The communication control valve opening forming portion includes:
Opposite the inlet and between the independent intake passage and the communication passage
At the gathering part of the bank on one side where the fset space is formed
The core structure for an intake device of an engine according to claim 1, wherein the core structure is provided corresponding to the offset space forming portion . 3. The core structure according to claim 1 or 2 is used.
And cast engine intake system,
An intake device for an engine, wherein a required additional gas introduction port is formed in the intake port .