JPH07217512A - Air intake device for engine and core structure thereof - Google Patents

Abstract

PURPOSE:To attain the stable support of a core at the casting time without forming core supporting holes separately, omit a hole closing process with a plug and facilitate the manufacture of an intake device by disposing core supporting parts making effective use of parts corresponding to necessary holes with relatively large opening area in the intake device after casting. CONSTITUTION:Both banks B1, B2 branch off from an intake lead-in port, and a communicating passage for communicating the collecting part of each bank mutually is provided on the anti-intake lead-in port side of the collecting part of both banks B1, B2. Such an intake device for a V-type engine is cast. Core supporting parts 33, 35, 37 for supporting a core 21 are respectively disposed at an intake lead-in port forming part 23, an opening forming part 34 for valve disposition and a gas lead-in port forming part 36 provided at the collecting part of both banks B1, B2.

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 an engine such as an intake manifold for a V-type engine and a core used in low pressure casting of the intake manifold, and a core structure thereof.

[0002]

2. Description of the Related Art Conventionally, as an intake device for a V-type engine, JP-A-2-104917 and JP-A-2-102 are known.
No. 322 publication. The former Japanese Patent Laid-Open No. 2-1
In the intake device described in Japanese Patent No. 04917, an intake passage is branched into both banks, and a communication passage that connects the collection portions of the banks to each other on the anti-intake introduction side of the collection portions of the banks (corresponding to a surge tank) is provided. It is provided.

The latter intake device described in Japanese Patent Application Laid-Open No. 2-102322 is branched into two banks from an intake inlet, and the collecting portions of the banks are mutually communicated with each other on the side opposite to the intake inlet. A communication passage is provided, and a valve such as a VRIS (Variable Resonance Ind) is provided on the side opposite to the intake inlet of the collecting portion of one of the two banks.
(auction system, variable resonance supercharging system) is provided with a communication control valve as a valve.

By the way, when casting such a hollow air intake device, generally, a shell mold is used.
uld) method, which requires a core that forms the inner surface of the casting (the intake system of the V-type engine) and a core support that supports this core.

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 because of the low pressure casting, unnecessary holes are formed in the intake device after casting. It was necessary to close this unnecessary hole with a plug.

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

[0007]

The invention (first invention) according to claim 1 of the present invention effectively utilizes a portion corresponding to a hole which is necessary and has a relatively large opening area in the intake device after casting. By arranging the child support part, stable support of the core is achieved during casting without separately forming a core support hole, and the plug closing step of the hole is omitted.
An object of the present invention is to provide a core structure for an intake system of an engine, which facilitates manufacturing of the intake system.

According to a second aspect of the present invention, in addition to the object of the first aspect of the invention, a communication control valve (VRIS valve) is provided at a portion where an intake inlet is formed and at a collecting portion of one bank. ), And a gas inlet that does not affect the distributability in the other side bank assembly (for example, a gas inlet that is introduced to increase the catalyst temperature during cold start) By arranging the core support portions at the parts where the cores are formed, the core support portions are evenly arranged, so that the cores can be supported more reliably and evenly during casting. The purpose is to provide a core structure.

According to a third aspect of the present invention, in addition to the object of the second aspect of the invention, a core is provided at a predetermined position.
By dividing the core, it is easy to manufacture a core having two complicated shapes, and the divided core is divided into a predetermined structure so that the weight distribution of the divided core becomes substantially equal. For the purpose of provision.

In the invention according to claim 4 of the present invention, in addition to the object of the invention according to claim 2 or 3, the communication control valve opening forming portion is connected to the independent intake passage in the collecting portion of the one side bank. By providing the offset support space corresponding to the portion where the offset space is formed, it is possible to secure a sufficient cross-sectional area of the core support portion provided in the communication control valve opening forming portion. An object of the present invention is to provide a core structure for an intake device of an engine, which is capable of improving the support and stabilization of the core by the portion.

The invention according to claim 5 of the present invention (the second invention) is an addition that requires distributability in an intake system for an engine cast by using the core structure according to claim 2, 3 or 4 above. An object of the present invention is to provide an intake device for an engine that does not impair the distribution of additional gas by forming an inlet for gas (for example, ISC air, EGR gas) in the intake inlet.

[0012]

According to a first aspect of the present invention, an intake air inlet is branched into both banks, and each bank is provided on the anti-intake air inlet side of the collecting portion of both banks. A core structure for an intake system of an engine for casting an intake system of a V-type engine, which is provided with a communication passage for communicating the collecting section with each other, wherein the intake introducing port forming section and a gas introducing port provided in the collecting section of both banks are provided. A core structure for an intake device of an engine is characterized in that a core supporting portion for supporting a core is arranged in each of the forming portion and the valve arranging opening forming portion.

According to a second aspect of the present invention, in addition to the configuration of the first aspect of the invention, an engine for casting an intake system for a V-type engine provided with a communication control valve for opening and closing the communication passage is provided. In the structure for the intake device core, the communication control valve opening forming portion provided in the collecting portion of the one side bank on the side opposite to the intake introducing port and the influence of the distributability provided in the collecting portion of the other side bank The core structure for an intake system of an engine is characterized in that a core support part for supporting a core is arranged in each of the gas introduction port forming part for introducing a gas without gas and the intake introduction port forming part.

According to a third aspect of the present invention, in addition to the configuration of the second aspect of the invention, an intermediate position of the intake introduction port forming portion and an intermediate position of the communication control valve opening forming portion are provided. Each of the cores has an air intake system core structure of an engine in which the core is divided into two parts.

According to a fourth aspect of the present invention, in addition to the structure of the second or third aspect of the invention, the communication control valve opening forming portion is on the opposite side of the intake introduction port and independent intake air. A core structure for an intake system of an engine, which is provided corresponding to the offset space forming portion in a collecting portion of the one-side bank in which an offset space is formed between the passage and the communication passage.

The invention according to claim 5 (second invention) of the present invention is an intake device for an engine cast by using the core structure according to claim 2, 3 or 4, wherein distributability is required. The intake device for an engine is characterized in that the additional gas introducing port is formed in the intake introducing port.

[0017]

According to the invention (first invention) of the first aspect of the present invention, the above-mentioned intake inlet forming portion, the gas inlet forming portion and the valve arrangement provided in the collecting portion of both banks are arranged. Since the core supporting portions for supporting the cores are arranged in the opening forming portion, the above-mentioned intake inlet, gas inlet, and valve-arranging opening are necessary for the intake device after casting and have a relatively large opening area. It is possible to increase the support cross-sectional area of the core support portion corresponding to each of these portions.

As a result, stable support of the core can be achieved during casting without forming a separate core support hole, and an unnecessary hole closing step with a plug as in the prior art can be omitted. This has the effect of facilitating the manufacture of the intake device.

According to the second aspect of the present invention,
In addition to the effect of the invention described in claim 1, the core support portion is provided in each of the above-mentioned intake introducing port forming portion, the communication control valve opening forming portion of the one side bank, and the gas introducing port forming portion of the other side bank. Since the respective cores are arranged, there is an effect that the cores can be supported more reliably and evenly by the core supporting portions during casting.

In addition, the gas introduction port forming portion of the other bank mentioned above is a gas which is not affected by the distributive property, for example, the engine speed after the air for ISC is introduced for the purpose of increasing the temperature of the catalyst at the cold start. Since the gas is a so-called AWS that is supplied in a stable state, there is no concern of impairing the performance of the intake system and engine after casting.

According to the invention of claim 3 of the present invention,
In addition to the effect of the invention as set forth in claim 2, a core support portion is included including the intermediate position of the intake air inlet formation portion and the intermediate position of the communication control valve opening formation portion as split surfaces. Since the core is divided into two, it is easy to manufacture a core having a complicated shape, and by dividing the core at the above-mentioned predetermined portion,
The weight distribution of the divided cores becomes substantially equal, and there is an effect that the core support portion stabilizes the core support.

According to the invention of claim 4 of the present invention,
In addition to the effect of the invention described in claim 2 or 3, since the communication control valve opening forming portion is provided corresponding to the offset space forming portion, the core support provided in the communication control valve opening forming portion. There is an effect that a sufficient cross-sectional area of the core can be secured and the core supporting portion can improve the stability of the core support.

According to the invention described in claim 5 (second invention) of the present invention, distributability is required in the intake device of the engine cast by using the core structure described in claim 2, 3 or 4. Additional gas (eg ISC air, EG
Since the introduction port of (R gas) is formed in the intake introduction port, the additional gas introduced from the additional gas introduction port can be evenly distributed to both banks, and the distribution property of the additional gas is not impaired. There is.

[0024]

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

In addition, the above-mentioned collecting portions 4 and 5 corresponding to the 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 to be attached to the intake manifold is integrally formed at the downstream end of each of the independent intake passages 7 to 12.

Further, the independent intake passage 9 of the bank B1 on one side
An offset space 14 is formed between the above-mentioned communication passage 6 and the above-mentioned communication passage 6, and the collecting portion 4 of the one-side bank B1 on the opposite side of the above-mentioned intake inlet 3 and corresponding to the above-mentioned offset space 14
A communication control valve opening 15 and a communication control valve mounting seat 16 are formed on the end side of the.

The communication control valve described above is a VRIS (Variable Resonance Induction System) that opens and closes the communication passage 6.
, Variable resonance supercharging system) valve.

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

Here, the above-mentioned gas which is not affected by the distributive property is, specifically, an air for ISC (idle speed control) is introduced for the purpose of increasing the catalyst temperature of the exhaust system at the cold start. This is the so-called AWS, which is the gas supplied under the stable engine speed after the start.

Further, the intake gas inlet 3 is formed with an additional gas inlet 19 which is required to have a distributive property. The additional gas required to have this dispersibility is, for example, for ISC or EGR.
It is gas.

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

The core 21 is branched from an intake inlet forming portion 23 forming the intake inlet 3 into both banks B1 and B2, and a collecting portion forming portion 24 forming a collecting portion 4 is formed in one bank B1. The condensing portion forming portion 25 forming the collecting portion 5 is integrally formed in the other bank B2.

Further, independent air intake passage forming portions 27, 28, 29, 30, 31, 31, 32 for forming the individual independent air intake passages 7 to 12 are integrally formed in the collecting portion forming portions 24, 25. There is.

Further, the communication passage 6 is provided on the side of the collecting portion forming portions 24 and 25 opposite to the intake air inlet forming portion 23.
A communication passage forming portion 26 for forming the above is integrally formed.

In addition, the core support portion 33 is integrally formed on the intake introduction port forming portion 23, and the core support portion 35 is formed on the communication control valve opening forming portion 34 for forming the communication control valve opening 15. And the gas inlet 1 described above.
The core support part 37 is integrally formed with the gas introduction port forming part 36 for forming 7, and the core support part 38 is integrally formed with the lower part of each of the independent intake passage forming parts 27 to 32 described above.

Here, the above-mentioned communication control valve opening forming portion 34.
Is formed corresponding to the offset space forming portion α corresponding to the above-mentioned offset space 14, and the core 21 and each core supporting portion 33, 35, 37, 38 are formed in the shell as shown in FIG. It is integrally formed in a hollow shape with a child [a core formed in a shell shape using sand mixed with a carboxylic acid-based synthetic resin powder (resin sand)].

Further, as shown in FIGS. 4 and 5, the core 21 is divided into a split surface 39 at an intermediate position of the intake inlet port forming portion 23 and an intermediate position of the communication control valve opening forming portion 34, respectively. , 40 and corresponding core support portions 33, 35 are divided into two.

Next, referring to FIGS. 1 to 3, the structure of the mold will be described. Each of the core supporting portions 33, 35, 3 described above.
An upper mold 41 and a lower mold 42 for supporting the core 21 are provided via 7, 38, and the upper and lower molds are formed by sand molds made of resin sand. A cavity 43 corresponding to the wall thickness of the intake device 1 is formed in the upper mold 41 and the lower mold 42 described above, and a shape surface 44 for forming the throttle body mounting seat 2 and a communication control valve mounting seat 16 are formed. And a shaped surface 46 for forming the mounting seat 18 for the gas introduction port 17 are formed.

Further, the lower mold 42 has two discarded molds 47, 48.
A shaped surface 49 for forming the above-mentioned mounting seat 13 using
On the other hand, in the mating surface portions of the upper mold 41 and the upper and lower molds, a pouring gate 50, a vertical sprue 51, and a runner 52 are formed so as to communicate with the cavity 43. , Air vent holes (gas vent holes) 53 are formed.

In order to perform low-pressure casting of the intake system 1 of the V-type 6-cylinder engine using the above-described core 21 and mold thus constructed, a molten aluminum or aluminum alloy is poured from the above-mentioned pouring port 50. Since this molten metal flows into the cavity 43 and the gas generated at the time of molten metal is extracted from the above-mentioned air vent hole 53 to the outside of the mold, when the molten metal is solidified, the mold is removed as shown in FIGS. As shown in FIG. 8, the intake device 1 of the V-type 6-cylinder engine can be cast. That is, the mold cavity 43 forms the outer surface of the intake device, and the core 21 forms the inner surface of the intake device 1. The above-mentioned additional gas inlet 1
9 is formed by punching after the intake device 1 is cast.

By the way, the above-mentioned intake introduction port forming portion 23,
A core support portion 33 for supporting the core 21 in the gas introduction port forming portion 36 and the valve arranging opening forming portion (see the communication control valve opening forming portion 34) provided in the collecting portions 4 and 5 of both banks B1 and B2. Since 37 and 35 are respectively arranged, the intake inlet 3, the gas inlet 17, and the valve installation opening (see the communication control valve opening 15) described above are necessary for the intake device 1 after casting and have a relatively large opening area. Therefore, the core supporting portions 33, 37, 35 corresponding to these respective portions (however, the respective portions 23, 3
6, 34) (including 6, 34) can be increased.

As a result, stable support of the core 21 can be achieved during casting without forming a separate core support hole, and the conventional plugging process of an unnecessary hole with a plug can be omitted. This has the effect of facilitating the manufacture of the intake device 1.

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

In addition, the gas inlet port forming portion 36 of the other side bank B2 described above has a gas which is not affected by the distributive property, for example, after the ISC air is introduced for the purpose of raising the temperature of the catalyst at the cold start. Since the gas is a so-called AWS that is supplied under the stable engine speed condition, there is no fear of impairing the performance of the intake system 1 and engine performance after casting.

Further, the intermediate position of the intake introducing port forming portion 23 and the intermediate position of the communication control valve opening forming portion 34 are divided surfaces 39 and 40, respectively, into the core supporting portion 33,
Since the core 21 is divided into two parts including 35, it is easy to manufacture the core 21 having a complicated shape, and the weight distribution of the divided core 21 is substantially reduced by dividing the core 21 at the predetermined portion. Core 2 with core support parts 33, 35, 37
1 has the effect of stabilizing the support.

Furthermore, since the above-mentioned communication control valve opening forming portion 34 is provided corresponding to the above-mentioned offset space 14 forming portion, the core support portion 35 provided in this communication control valve opening forming portion 34 is sufficient. There is an effect that the cross-sectional area can be secured and the stability of the support of the core 21 by the core support portion 35 can be improved.

In addition, the additional gas (for example, ISC air, EGR gas) required to be distributed in the intake system 1 of the V-type 6-cylinder engine cast by using the above-mentioned core structure.
Since the introduction port 19 of the additional gas is formed in the intake introduction port 3, the additional gas introduced from the additional gas introduction port 19 is supplied to both banks B.
1 and B2 can be evenly distributed, which has the effect of not impairing the distribution of the additional gas.

In the correspondence between the configuration of the present invention and the above-described embodiment, the engine intake system of the present invention is the V of the embodiment.
Corresponding to the intake system 1 of the 6-cylinder engine, and so on.
The core supporting portion arranged in the intake air inlet forming portion is
Corresponding to the core support portion 33 including the core support portion 33 disposed in the valve arrangement opening formation portion, and corresponding to the core support portion 35 including the portion 34, disposed in the gas introduction port formation portion. The core support part corresponds to the core support part 37 including the part 36, the communication control valve corresponds to the VRIS valve, and the gas having no influence on the distributability corresponds to the AWS and the distributability is required. The additional gas
Although the present invention is applicable to ISC gas or EGR gas, the present invention is not limited to the configuration of the above embodiment,
For example, V8, V10, V12 other than V-6 engine
Needless to say, the invention may be applied to the intake system of the V-type multi-cylinder engine and the core structure thereof.

[Brief description of drawings]

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

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

FIG. 3 is an enlarged cross-sectional view taken along the line YY of FIG.

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 6-cylinder engine cast using the core structure.

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

8 is a cross-sectional view taken along the line ZZ of FIG.

[Explanation of symbols]

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

Claims (5)

[Claims] Claim: What is claimed is: 1. Casting an intake device for a V-type engine, which is branched from an intake inlet into both banks, and a communication passage is provided on the opposite intake inlet side of the aggregates of both banks to connect the aggregates of each bank to each other. A core structure for an intake system of an engine, comprising a core support part for supporting the core in the intake inlet forming part, a gas introducing port forming part provided in a collecting part of both banks, and a valve arranging opening forming part. The core structure for the intake system of the engine that is respectively arranged. 2. A core structure for an intake system of an engine for casting an intake system of a V-type engine, which is provided with a communication control valve for opening and closing the communication passage, wherein a bank of one side is provided on the side opposite to the intake introduction port. The communication control valve opening forming part provided in the collecting part, the gas introducing port forming part for introducing the gas having no influence of the distributability provided in the collecting part of the other bank, and the intake introducing port forming part The core structure for an intake system for an engine according to claim 1, wherein core supporting portions for supporting the child are arranged. 3. The intake system for an engine according to claim 2, wherein the core is divided into two parts with an intermediate position of the intake introduction port forming part and an intermediate position of the communication control valve opening forming part as dividing surfaces. Child structure. 4. The offset space of the communication control valve opening forming portion on the opposite side of the intake air inlet and at the collecting portion of the one-side bank in which an offset space is formed between the independent intake passage and the communication passage. The core structure for an intake device of an engine according to claim 2 or 3, which is provided so as to correspond to a forming portion. 5. An intake device for an engine cast by using the core structure according to claim 2, 3 or 4, wherein an additional gas inlet for which distributability is required is formed in the intake inlet. Engine intake device.