JPH11141421A - Intake device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of part items and to improve workability at the time of assembly by integrally forming a collector, a manifold and a throttle body from two split bodies. SOLUTION: A resinous upper molded body 9 in which a collector upper case 10 and a manifold upper side split body 11 are integrally formed is arranged on the upper side of this intake device 1. A resinous lower molded body 3 in which a collector bottom case 4, a manifold lower side split body and a throttle body 6 are integrally formed in arranged on the lower side of the intake device 1. When the intake device 1 is assembled, the upper molded body 9 and the lower molded body 3 are jointed together, thereby a collector 13 and each manifold 14 can be formed. A throttle device 15 is connected to an air cleaner through a duct 18 and so on.

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 internal combustion engine suitable for use in an intake system of, for example, an automobile engine.

[0002]

2. Description of the Related Art Generally, an internal combustion engine such as an automobile engine is provided with an intake device for sucking external intake air into a combustion chamber of the engine. An intake device for an engine of this type according to the related art includes a metal collector into which outside air flows in through an air cleaner, a plurality of manifolds extending from the collector toward each cylinder of the engine, and an air cleaner and a collector. And a metal throttle device for increasing / decreasing the intake air amount of the engine.

Here, the throttle device is a substantially cylindrical throttle body made of a metal material or the like, and is provided rotatably in the throttle body, and is opened and closed according to the operation amount of an accelerator pedal or the like. And a valve. The throttle body has one end connected to an air cleaner for intake via a duct or the like, and the other end connected to a collector.

In this case, for example, a connection flange is formed on the other end of the throttle body, and the flange is attached to a connection port of a collector via a plurality of mounting bolts. A sealing member such as a gasket for hermetically sealing the space between the flange and the connection port of the collector is provided.

During operation of the engine, intake air from the outside flows into the collector through an air cleaner, a duct, a throttle device, and the like, and the intake air flows from the collector into each cylinder of the engine through each manifold. It is sucked in.

[0006]

By the way, in the above-mentioned prior art, the throttle device is mounted on the collector by mounting bolts or the like. Therefore, when the throttle device is connected to the collector at the time of assembling the intake device, the throttle device must first be connected to the collector. After a seal member such as a gasket is mounted between the flange and the connection port of the collector, it is necessary to sequentially mount each mounting bolt and the like between the flange and the connection port while the flange is kept in contact with the connection port.

Therefore, in the prior art, the number of parts for connecting the throttle device and the collector is determined by the number of mounting bolts,
There is a problem that not only the structure is increased due to the sealing member and the like, but also the structure of these connecting portions becomes complicated, and the work of attaching the throttle device to the collector is troublesome, and the intake device cannot be assembled efficiently.

[0008] Further, if the mounting state of the seal member is poor at the time of shipment of the intake device, or if the seal member deteriorates with time while the engine is operated for a long period of time,
There is a possibility that the airtightness between the throttle device and the collector may be reduced, and there is also a problem that it is difficult to improve the reliability.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention can easily connect a throttle device and a collector, greatly reduce the number of parts for connecting the throttle device, and assemble. It is an object of the present invention to provide an intake device for an internal combustion engine that can perform work efficiently and reliably improve reliability.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a first aspect of the present invention is to provide a collector bottom case having an open upper side, a plurality of manifold lower divisions extending from the collector bottom case, and a throttle valve therein. A lower molded body integrally formed of a resin material and a throttle body provided so as to be openable and closable, and a plurality of manifold upper divisions joined to a collector upper case joined to a collector bottom case and each manifold lower division body An upper molded body in which the body is integrally formed of a resin material is employed.

With this configuration, when assembling the intake device, the lower molded body and the upper molded body molded using a resin material are joined to each other to connect the collector, the manifold, and the throttle device of the intake device. It can be integrally formed in the state where it was made.

Further, according to a second aspect of the present invention, there is provided a lower molding in which a collector bottom case having an upper side opening and a throttle mounting portion formed therein and a plurality of manifold lower divisions extending from the collector bottom case are integrally formed of a resin material. Body, a collector upper case joined to the collector bottom case, and an upper molded body integrally formed of a resin material and a plurality of manifold upper divided bodies joined to each manifold lower divided body, and a throttle mounting of the lower molded body And a throttle body made of a resin material and provided with a throttle valve capable of being opened and closed therein.

Accordingly, when assembling the intake device, the lower molded body and the upper molded body can be joined to each other first, and then the throttle body can be joined to the throttle mounting portion of the lower molded body, and the collector, the manifold and the throttle device can be assembled. Can be integrally formed in a connected state.

Further, according to the third aspect of the present invention, a metal bush or bearing into which the rotation shaft of the throttle valve is inserted is formed integrally with the throttle body in a direction orthogonal to the flow of the intake air. I have.

Thus, when a bearing or the like for a throttle valve is provided in the throttle body, for example, a bush or a bearing can be integrally formed in the bearing to increase the strength of the bearing or the like. Then, the rotation shaft and the like of the throttle valve can be rotatably supported by these bushes or bearings.

Further, in the invention of claim 4, a metal sleeve is integrally formed on the inner wall side of the throttle body in the same direction as the flow of the intake air.

Thus, it is possible to prevent the inner diameter of the throttle body molded from the resin material from being changed from a predetermined dimension due to an error during molding, a change in ambient temperature, or the like.

Further, in the invention of claim 5, a metal sleeve is attached to the inner wall side of the throttle body by press-fitting in the flow direction of the intake air.

Thus, the metal sleeve can be pressed into the inner wall of the throttle body after the throttle body is formed.
The inner diameter of the throttle body can be kept at a predetermined size.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below in detail with reference to FIGS.

FIGS. 1 to 4 show a first embodiment according to the present invention. In this embodiment, an air intake device such as an automobile engine will be described as an example.

Reference numeral 1 denotes an intake device for an engine installed in an engine room of an automobile or the like together with the engine body 2;
The intake device 1 includes a lower molded body 3 and an upper molded body 9 described later, and includes a collector 13, manifolds 14, 1
4,..., A throttle device 15 and the like.

Numeral 3 denotes a lower molded body constituting the lower side of the intake device 1. The lower molded body 3 is, for example, 6 as shown in FIG.
It is formed by injection molding a resin material made of 6 nylon, polyphenylene sulfide (PPS), or a reinforced resin made of 66 nylon mixed with glass wool or the like, and having a relatively small dimensional change due to a temperature change or the like.

The lower molded body 3 has a substantially box-shaped collector bottom case 4 having an open upper side, and, for example, four manifold lower divided bodies 5, each having a substantially circular arc-shaped cross section and having an open upper side. .., A substantially cylindrical throttle body 6 constituting a main body of the throttle device 15, a flange portion 7 protruding outward from the collector bottom case 4, the upper peripheral edge of each manifold lower divided body 5, and the like. Are integrally formed.

Here, each manifold lower divided body 5 is
A flange-like mounting portion (neither is shown) is integrally formed at the tip end side of each of the cylinders of the engine, extending from the collector bottom case 4 toward each cylinder of the engine. I have.

The throttle body 6 has a base end integrally formed on the side surface of the collector bottom case 4 and protrudes outward from the collector bottom case 4 and has a front end connected to a duct 18 described later. 6A. Further, as shown in FIG. 3, the throttle body 6 is integrally formed with bearings 6B, 6B for a throttle valve 16, which will be described later, at positions facing each other in the radial direction, and each bearing 6B has a short cylindrical shape. And protrudes outward from the throttle body 6.

Metal bushes 8, 8 are integrally formed in each bearing portion 6B by, for example, insert molding or the like, and the axial direction of each bush 8 extends through the throttle body 6 in FIG. , And extends in the radial direction of the throttle body 6 so as to be orthogonal to the flow of intake air flowing in the direction indicated by the arrow A.

Numeral 9 denotes an upper molded body formed of a resin material or the like in the same manner as the lower molded body 3.
As shown in FIG. 2, a substantially box-shaped collector upper case 10 having an open lower side, and four manifold upper divided bodies 11, 1 each having a substantially arc-shaped cross section and having an open lower side.
, And other flange portions 12 that protrude outward from the lower peripheral edge or the like of the collector upper case 10 and the manifold upper divided bodies 11 are integrally formed. Each manifold upper divided body 11 is extended from the collector upper case 10 to the engine body 2 side corresponding to the manifold lower divided body 5 of the lower molded body 3, and has a flange-shaped mounting portion 11A at the tip end side. Are integrally formed.

Here, the flange portion 12 of the upper molded body 9
Is bonded to the flange 7 of the lower molded body 3 by means of, for example, vibration welding, high frequency welding, or the like, whereby the upper molded body 9 is integrally fixed on the lower molded body 3. The upper collector case 10 is joined to the lower collector case 4, and these constitute a collector 13.

Each of the manifold upper divided bodies 11 is joined to the manifold lower divided body 5, and these constitute four manifolds 14, 14,..., Respectively.
Each of the manifolds 14 is attached to the engine body 2 via an attachment portion 11A of the manifold lower split body 5 and the manifold upper split body 11, and is connected to each cylinder of the engine.

Reference numeral 15 denotes a throttle device for increasing or decreasing the amount of intake air of the engine. The throttle device 15 is, as shown in FIGS.
And a throttle valve 16 provided in the throttle body 6 so as to be opened and closed.

The throttle valve 16 has a rotary shaft 16A rotatably supported at both axial ends thereof by bearings 6B of the throttle body 6, and a screw at an intermediate portion of the rotary shaft 16A in the axial direction. And a circular valve plate 16C attached using 16B or the like. And the rotating shaft 1
6A is rotatably inserted into each bush 8 of the throttle body 6 via a bearing 17 having a ball bearing or the like at both ends. Further, the throttle device 15 has a connection port 6A of the throttle body 6 connected to an air cleaner (not shown) through a duct 18 or the like.

When the throttle valve 16 is opened and closed in accordance with the operation amount of an accelerator pedal (not shown) of the automobile, the throttle device 15 sends the throttle body 6, the collector 13, and each manifold from the air cleaner. The control unit variably controls the flow rate of the intake air to be taken into each cylinder of the engine via the engine.

The intake device 1 for an automobile engine or the like according to the present embodiment has the above-described configuration. Next, the operation thereof will be described.

First, during operation of the engine, the throttle valve 16 is opened and closed in accordance with the operation amount of the accelerator pedal, so that the intake air from the outside is supplied to the air cleaner, as shown by the arrow A in FIG. Throttle body 6, collector 1
At this time, fuel is injected into the intake air in each manifold 14 from a fuel injection valve (not shown) provided in the manifold upper divided body 11 and the like. You.

When the intake device 1 is manufactured, as shown in FIG. 4, first, the lower molded body 3 integrally formed with the throttle body 6 and the upper molded body 9 are formed by injection molding or the like. Subsequently, the rotary shaft 16A of the throttle valve 16 is inserted into each bush 8 of the throttle body 6 together with the bearing 17, and the valve plate 16C is attached to the rotary shaft 16A by screws 16B or the like. Then, the lower molded body 3 and the flange portions 7 and 12 of the upper molded body 9 are integrally joined by vibration welding or the like.

Next, when assembling the intake device 1 to a vehicle such as an automobile, first, the lower molded body 3 and the upper molded body 9 are accommodated in an engine room, and the mounting portions 11A and the like of each manifold 14 are mounted with mounting bolts or the like. And a duct 18 is connected between the outflow side of the air cleaner previously disposed in the engine room and the connection port 6A of the throttle device 15.

Thus, in the present embodiment, the intake device 1
A lower molded body 3 made of resin in which the collector bottom case 4, the manifold lower divided body 5 and the throttle body 6 are integrally molded, and an upper molded body made of resin in which the collector upper case 10 and the manifold upper divided body 11 are integrally molded. Therefore, when assembling the intake device 1, the lower molded body 3 and the upper molded body 9 are joined to each other, and the throttle valve 16 and the like are assembled to the throttle body 6. Device 15
Can be easily formed integrally, and the assembling work of the intake device 1 can be performed efficiently.

Moreover, the collector 13 and the manifold 14
Since the throttle device 15 and the throttle device 15 are integrally formed of a resin material, there is no need to connect the collector 13 and the throttle device 15 using mounting bolts, sealing members, etc. as described in the related art, and these connection operations can be easily performed. It can be carried out. In addition, the number of parts of the intake device 1 can be significantly reduced, and the weight and cost of the intake device 1 can be reduced. In addition, the airtightness between the collector 13 and the throttle device 15 can be stably maintained for a long period of time, and reliability can be reliably improved.

Further, each bearing portion 6 of the throttle body 6
Since the bush 8 made of metal is integrally formed on B, the strength of each bearing portion 6B made of a resin material can be increased by the bush 8, and the rotating shaft 16A of the throttle valve 16 can be stabilized by the bush 8, the bearing 17 and the like. And can support
Durability can be reliably increased.

Next, FIG. 5 shows a second embodiment according to the present invention. In the present embodiment, the same reference numerals are given to the same components as those in the first embodiment, and the description will be given. It shall be omitted. However, a feature of the intake device 21 of the engine according to the present embodiment is that a lower forming body 22 and a throttle body 32 described later are formed separately.

Here, the air intake device 21 has a lower molded body 22 and an upper molded body 26 made of a resin material in substantially the same manner as the air intake system 1 according to the first embodiment. Substantially box-shaped collector bottom case 2 with open side
3 and, for example, four manifold lower split bodies 2 extending from the collector bottom case 23 toward each cylinder of the engine.
, And the flange portion 25 are integrally formed.

However, on the side surface of the collector bottom case 23, a throttle mounting portion 23A for the throttle body 32 is provided.
Is formed in a short cylindrical shape and protrudes outward, and a connecting flange 23B is provided on a protruding end side of the throttle mounting portion 23A.
Are provided radially outward.

Reference numeral 26 denotes an upper molded body having substantially the same structure as the upper molded body 9 according to the first embodiment. The upper molded body 26 includes a collector upper case 27, manifold upper divided bodies 28, 28,. A flange portion 29 is integrally formed, and the flange portion 29 is joined to the flange portion 25 of the lower molded body 22 by using, for example, means such as vibration welding or high frequency welding. Thereby, the upper molded body 26 is fixed on the lower molded body 22. The collector upper case 27 is joined to the collector bottom case 23, and these constitute the collector 30. Further, each manifold upper divided body 28 is joined onto the manifold lower divided body 24, and these constitute the manifolds 31, 31,.

A substantially cylindrical throttle body 32 made of a resin material has a connection port 32A for the duct 18 and insert molding, similar to the throttle body 6 according to the first embodiment. And a pair of bearings (not shown) in which the bush 33 is integrally formed. Further, the throttle body 32 is provided with another flange 32B that is joined to the flange 23B of the collector bottom case 23 by using, for example, vibration welding, high frequency welding, or the like.

Thus, the throttle body 32 is fixed to the throttle mounting portion 23A of the collector bottom case 23 via the flanges 23B, 32B. The throttle body 32 forms a main body of the throttle device 34. Inside the throttle body 32, a throttle valve 35 including a rotating shaft 35A, a valve plate 35B, and the like is provided so as to be opened and closed via a bearing 36 and the like. I have.

Thus, also in the present embodiment having such a configuration, it is possible to obtain substantially the same operation and effect as in the first embodiment. And especially in this embodiment,
For example, the lower molded body 22 and the throttle body 32 can be injection-molded using separate molds and the like, respectively, and these molding operations can be easily performed, and the shape of the mold for injection molding and the like can be simplified. be able to.

Next, FIGS. 6 and 7 show a third embodiment of the present invention.
In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. However, a feature of the intake device 41 of the engine according to the present embodiment is that a metal sleeve 45 is provided on the inner wall side of a throttle body 43 described later.

Here, the lower molded body 42 of the intake device 41
In a similar manner to the lower molded body 3 according to the first embodiment, the collector bottom case 4, each manifold lower divided body 5, the throttle body 43 and the flange 7 are integrally formed of a resin material. And the lower molded body 4
On the upper part 2, the upper molded body 9 is joined via the flange portions 7 and 12, whereby the collector 13 and each manifold 14 are formed.

The throttle body 43 is connected to the duct 1
8 and a substantially cylindrical shape having a bearing portion (not shown) for the throttle valve 16 and the like, and constitutes a main body of the throttle device 44. However, a metal sleeve 45 having a predetermined inner diameter is integrally formed on the inner wall side of the throttle body 43 by means such as insert molding.

As shown in FIG. 7, the sleeve 45 is provided with a pair of insertion holes 45A (only one of them is shown) at a position radially opposed to each other for inserting the rotation shaft 16A of the throttle valve 16. . Further, the sleeve 45 is disposed on the outer peripheral side of the throttle valve 16 and substantially coaxially with the throttle body 43, and extends in the same direction as the flow of the intake air flowing in the throttle body 43 in the axial direction.

Thus, in the present embodiment having the above-described structure, substantially the same operation and effect as those of the first embodiment can be obtained. And especially in this embodiment,
The inner diameter of the throttle body 43 formed of a resin material can be maintained at a predetermined size by a metal sleeve 45, and the inner diameter is a predetermined size determined by an error during molding, a change in ambient temperature, and the like. And the intake air of the engine can be smoothly circulated in the throttle body 43.

In the third embodiment, the sleeve 45 is formed by insert molding on the inner wall side of the throttle body 43. However, the present invention is not limited to this. Connect the throttle body 51 to the connection port 5
1A and the main body portion 51B, and are separately formed.
5 may be attached to the inner wall side of the main body portion 51B by press-fitting means such as heat press-fitting.

When assembling the throttle device, first, the main body portion 51 protruding from the collector bottom case 4 is provided.
B is heated, and in this state, the sleeve 45 is pressed in the axial direction along the inner wall surface from the protruding end side of the main body portion 51B. Subsequently, after the throttle valve 16 and the like are assembled to the main body portion 51B, the connection port 51A may be fixed to the protruding end side of the main body portion 51B.

As a result, the throttle body 51 can be easily formed by injection molding or the like, and the metal sleeve 45 can be easily attached to the inner wall side of the throttle body 51 even after injection molding.

In the second embodiment, the throttle body 32 is made of a resin material. However, the present invention is not limited to this, and the inner wall of the throttle body 32 may be made of a metal material used in the third embodiment. The sleeve 45 may be integrally formed.

Further, in the first and second embodiments, the throttle valve 1 is provided in the bushes 8, 33 of the throttle bodies 6, 32 via bearings 17, 36 such as ball bearings.
Although the rotation shafts 16A and 35A are rotatably inserted through the rotation shafts 6 and 35, the present invention is not limited thereto.
Alternatively, a configuration using a cylindrical oilless bearing may be used.
Further, the bearings 17 and 36 may be omitted, and a tubular oil-free bearing may be formed integrally with the throttle bodies 6 and 32 instead of the bushes 8 and 33. In this case, a cylindrical body made of a self-lubricating material such as copper, carbon, or polytetrafluoroethylene (PTFE) may be used as the oil-free bearing.

In each of the above-described embodiments, for example, the lower molded bodies 3 and 2 are formed by using means such as vibration welding and high frequency welding.
Although the flange portions 7 and 25 of the upper and lower molded bodies 9 and 26 are joined to the flange portions 12 and 29 of the upper molded bodies 9 and 26, the present invention is not limited thereto. It may be.

Furthermore, in each of the above embodiments, the lower molded bodies 3, 22, and 42 are arranged on the lower side in the figure, and the upper molded bodies 9 and 26 are arranged on the upper side.
1, 41, but the intake devices 1, 21
Numeral 41 may be arranged so as to have an arbitrary positional relationship with respect to the engine body 2 in the upward and downward directions or the left and right directions. It is not limited.

In each of the above embodiments, the case where the intake devices 1, 21, 41 are used in a four-cylinder engine has been described as an example. However, the present invention is not limited to this, and the present invention is not limited thereto. The present invention may be applied to an engine having five or more cylinders.

Further, in each of the above embodiments, the case where the air intake devices 1, 21, 41 are used for an automobile engine has been described as an example. However, the present invention is not limited to this. The present invention may be applied to an internal combustion engine such as an industrial machine.

[0062]

As described above in detail, according to the first aspect of the present invention, since the intake device is composed of the lower molded product and the upper molded product made of resin, the collector, the manifold and the throttle device of the intake device can be easily manufactured. It can be integrally formed, and the assembling work can be performed efficiently. In addition, since it is not necessary to connect the collector and the throttle body using mounting bolts, seal members, etc. as in the prior art, these connection operations can be easily performed, and the number of parts of the intake device is greatly reduced. In addition, the weight can be reduced. Further, the airtightness between the collector and the throttle device can be stably maintained for a long period of time, and the reliability can be reliably improved.

According to the second aspect of the present invention, since the intake device is composed of the lower molded body, the upper molded body, and the throttle body made of resin, the collector, the manifold, and the throttle device can be efficiently and integrally assembled. Can be. Further, the collector and the throttle body can be easily connected, the number of components of the intake device can be significantly reduced, and the weight and reliability of the intake device can be improved. Further, for example, the lower molded body and the throttle body can be molded using separate molds, respectively, and these molding operations can be easily performed, and the shape of the molding mold and the like can be simplified. it can.

Further, according to the third aspect of the present invention, since the metal bush or the bearing is formed integrally with the throttle body, the strength of, for example, a bearing provided on the throttle body can be increased, and the throttle valve can be increased. Can be stably supported by the bush or the like, and the durability can be reliably improved.

According to the fourth aspect of the present invention, since the metal sleeve is integrally formed on the inner wall side of the throttle body, the inner diameter of the throttle body made of a resin material is adjusted to a predetermined size by the sleeve. It is possible to reliably prevent the inner diameter from fluctuating from a predetermined size due to an error during manufacture, a change in ambient temperature, and the like, and to allow the intake air of the internal combustion engine to smoothly flow through the throttle body. be able to.

Further, according to the fifth aspect of the present invention, since the metal sleeve is press-fitted to the inner wall side of the throttle body and mounted, for example, the sleeve can be easily mounted on the inner wall side after molding the throttle body. Can be
The inner diameter of the throttle body can be maintained at a predetermined size by the sleeve.

[Brief description of the drawings]

FIG. 1 is a front view showing an intake device for an engine according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the intake device as viewed from the direction of arrows II-II in FIG.

FIG. 3 is an enlarged cross-sectional view of the throttle device as viewed from a direction indicated by arrows III-III in FIG. 2;

FIG. 4 is an exploded view showing a state before assembling the intake device in FIG. 2;

FIG. 5 is a longitudinal sectional view showing an intake device for an engine according to a second embodiment.

FIG. 6 is a longitudinal sectional view showing an intake device for an engine according to a third embodiment.

FIG. 7 is an exploded view showing a state before assembling the intake device in FIG. 6;

FIG. 8 is an exploded view similar to FIG. 7, showing a modification of the third embodiment.

[Explanation of symbols]

 1,21,41 Intake device 3,22,42 Lower molded body 4,23 Collector bottom case 5,24 Manifold lower divided body 6,32,43,51 Throttle body 8,33 Bush 9,26 Upper molded body 10, 27 Collector upper case 11, 28 Manifold upper split body 16, 35 Throttle valve 16A, 35A Rotating shaft 23A Throttle mounting part 45 Sleeve

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI F02M 35/104 F02M 35/10 102N (72) Inventor Munehiro Kudo 1370 Onna, Atsugi-shi, Kanagawa Pref.

Claims (5)

[Claims] 1. A lower mold in which a collector bottom case having an open upper side, a plurality of lower manifolds extending from the collector bottom case, and a throttle body in which a throttle valve is provided so as to be openable and closable are integrally formed of a resin material. And an upper molded body integrally formed of a resin material with a plurality of manifold upper divided bodies joined on the collector lower case and the manifold lower divided bodies joined on the collector bottom case. An intake device for an internal combustion engine. 2. A lower molded body integrally formed of a resin material with a collector bottom case having an upper side opening and a throttle mounting portion formed therein, and a plurality of manifold lower divisions extending from the collector bottom case; An upper molded body integrally formed of a resin material and a collector upper case joined to the upper part and a plurality of manifold upper divided bodies joined to the manifold lower divided bodies; and a throttle mounting portion of the lower molded body joined to the upper molded body. And a throttle body made of a resin material inside which a throttle valve is openably and closably disposed. 3. The throttle body according to claim 1, wherein a metal bush or a bearing through which a rotation shaft of the throttle valve is inserted is integrally formed in the throttle body in a direction orthogonal to the flow of the intake air. An intake device for an internal combustion engine according to claim 1. 4. The intake device for an internal combustion engine according to claim 1, wherein a metal sleeve is integrally formed on the inner wall side of the throttle body in the same direction as the flow of the intake air. 5. The intake device for an internal combustion engine according to claim 1, wherein a metal sleeve is attached to an inner wall side of the throttle body by press-fitting in a flow direction of intake air.