JPH11173170A - Suction device of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a throttle body in a structure easily standardizable and commonly usable to various sorts of internal combustion engines. SOLUTION: In a throttle body 19, its one end 19a fastened with an outlet duct 18 at the outlet side of an air cleaner, and the other end 19b fastened with a surge tank 22 are both made in a plain form, the plain surfaces of one end 19a and the other end 19b are allowed to abut respectively to the outlet duct 18 and the end 18b of the surge tank 22, so as to hold and fix the throttle body 19 in the sandwitch form between the end 18b of the outlet duct 18 and the end 22a of the surge tank 22. Consequently, the throttle body can be made in a plain plate form, and miniaturization, weight reduction and standardization can be realized.

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 an internal combustion engine, and more particularly to a fastening structure for a throttle body.

[0002]

2. Description of the Related Art Conventionally, in an intake device for an internal combustion engine, a throttle body having a built-in throttle valve for adjusting an intake amount is disposed between an outlet duct of an air cleaner case and a surge tank of an intake manifold. And
As described in Japanese Utility Model Publication No. 2-41328, the fastening structure between the outlet duct and the surge tank and the throttle body is usually formed such that one end of the throttle body is inserted into the outlet duct and the other end is flat. As
The structure is to be fastened to the surge tank.

[0003]

However, according to the conventional structure described above, the throttle body has a different fastening structure in which one end of the throttle body has a plug-in shape and the other end has a flat shape. Even when the diameters are the same, the insertion shape of one end of the throttle body and the other end are taken into consideration in consideration of avoiding interference with other parts around the internal combustion engine and the arrangement relationship between the outlet duct and the surge tank. In many cases, the flat-shaped fastening portion differs for each internal combustion engine. As a result, the overall shape of the throttle body often differs for each internal combustion engine.

[0004] In recent years, as the intake manifold has been made of resin and the intake system components have been integrated (moduleed), there has been an increasing demand for the throttle body to be smaller, lighter and lower in cost. However, the conventional structure described above cannot meet such a demand. The present invention has been made in view of the above points, and has as its object to provide a throttle body having a structure which can be commonly used for various internal combustion engines and which can be easily standardized.

[0005]

To achieve the above object, according to the first aspect of the present invention, a throttle body (1) is provided.
9) to the outlet duct (1) on the air cleaner (14) outlet side.
8) and the other end (19b) fastened to the surge tank (22) have flat shapes, and the one end (19) of the throttle body (19) is flat.
a) and the flat surface of the other end (19b) with the outlet duct (1).
8) and the end (18b, 22) of the surge tank (22).
a), and the throttle body (19) is sandwiched and fixed between the end (18b) of the outlet duct (18) and the end (22a) of the surge tank (22). And

According to this, the throttle body (19)
Since both ends (19a, 19b) can be formed in a flat plate shape, the throttle body (19) can be reduced in size and weight, and a small flat plate can be easily manufactured, thereby reducing the cost. Can be realized at the same time.
Further, by making the throttle body (19) flat, it is possible to achieve standardization that can be commonly used for various internal combustion engines. In other words, to avoid interference with other parts around the internal combustion engine and to change the layout of each internal combustion engine, etc., the change is made on the outlet duct (18) and the surge tank (22) side, and the throttle body (19) has a flat plate shape. Can be standardized.

According to a second aspect of the present invention, one end (19a) and the other end (19) of the throttle body (19) are provided.
The flat surfaces b) are preferably formed parallel to each other.
According to the third aspect of the present invention, the throttle body (1
9), a mounting hole (30) penetrating between the flat surfaces of the one end (19a) and the other end (19b) is provided, and a fastening means (31) penetrating the mounting hole (30) is used to set the throttle body (30). 19) to the end (18) of the outlet duct (18).
By fastening the throttle body (b) and the end (22a) of the surge tank (22) together, the assembly work of the throttle body (19) can be simplified.

Further, in the invention according to claim 4, positioning means (18d, 18e, 22c, 22d, 35, 35) for positioning the fastening position of the throttle body (19) with respect to the outlet duct (18) and the surge tank (22). 35
a, 36, 36a) to one end (19a) of the throttle body (19) and the end (18b) of the outlet duct (18).
And the other end (1) of the throttle body (19).
9b) and an end (22a) of the surge tank (22).

According to this, the throttle body (19)
By accurately positioning the mounting position, the throttle body (19) can be easily and reliably mounted to the proper position. According to the fifth aspect of the present invention, one end (19a) of the throttle body (19) is connected to the outlet duct (1).
8) and between the other end (19b) of the throttle body (19) and the end (22a) of the surge tank (22).
38)).

According to this, the throttle body (19)
By securely sealing the fastening portion, it is possible to reliably prevent outside air from entering the intake passage. In the invention according to claim 6,
An outlet duct (1) located on the outlet side of the air cleaner (14) is provided on a throttle body (19) including a throttle valve (20) for adjusting the amount of intake air to the internal combustion engine (10).
8) and one end (1a) fastened to a surge tank (22) for reducing intake pulsation.
9b), one end (19a) and the other end (1
9b) to the end (18) of the outlet duct (18), respectively.
b) and an end (22a) of the surge tank (22) in a flat shape capable of contacting the end (22a). One end (19a) and the other end (19b) of this flat shape are respectively provided in the outlet duct (18). And an end face (18b) of the internal combustion engine and an end face (22a) of the surge tank (22).

As described above, the invention according to claim 6 is directed to a throttle body, and can provide a small and lightweight throttle body which can be easily standardized. Also,
In the invention according to claim 7, the throttle body (19) provided on the downstream side of the air of the outlet duct (18) located on the outlet side of the air cleaner (14) is divided into first and second block bodies (190, 191). The first and second block bodies (190, 191) are provided with main bodies (190a, 191a) for supporting one end and the other end of a shaft (21) for rotating the throttle valve (20). , The end (18b) of the outlet duct (18) and the surge tank (2)
2) with the end (22a) of the recess (48,
49), the first and second block bodies (190, 191)
Of the main body (190a, 191a),
The end (18b) of the outlet duct (18) and the end (22a) of the surge tank (22) are directly contacted and fastened.
It features an intake device for an internal combustion engine.

According to the seventh aspect of the present invention, similarly to the first aspect, not only can the throttle body (19) be standardized, but also the throttle body (19) can be made first and second.
It is divided into block bodies (190, 191), and the main bodies (190a, 19) of the first and second block bodies (190, 191).
1a) is housed in the recesses (48, 49),
Since the intake passage around the throttle valve (20) is constituted by the end (18b) of the outlet duct (18) and the end (22a) of the surge tank (22), the second passage forms the throttle body (19). 1, the second block body (190, 19
The portion for the passage configuration can be eliminated from 1), and the throttle body (19) can be further reduced in size and weight.

The reference numerals in parentheses of the above means indicate the correspondence with the concrete means described in the embodiments described later.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 to 8 show a first embodiment in which the present invention is applied to an intake device of an internal combustion engine for running a vehicle.
The internal combustion engine 10 (FIG. 1) is a four-cylinder type in this example,
The cylinder row direction is a direction perpendicular to the paper surface of FIG. 1 (the left-right direction in FIG. 2). 10a is a cylinder head of the internal combustion engine 10, and 10b is an intake port.

Immediately adjacent to the internal combustion engine 10,
An intake device 11 according to the invention is provided. The intake device 11 is composed of a single unit assembly in which various intake system components described later are compactly integrated. In the intake device 11, an air cleaner case 12 is arranged above a portion near the internal combustion engine 10, and an opening 12a (FIG. 1) is provided on an inclined surface on the upper surface side of the air cleaner case 12, and the opening 12a is provided. A cap member 13 that closes 12 a is detachably attached to the air cleaner case 12 in a direction indicated by an arrow a (a direction perpendicular to the air flow).
An air cleaner 14 is integrally held at a portion of the cap member 13 protruding into the air cleaner case 12, and the air cleaner 14 is also detachable integrally with the cap member 13.

The air cleaner case 12 and the cap portion 13 are both made of resin, have a certain degree of elasticity such as nylon, and are formed from a resin material having excellent strength. The resin component is also molded with the same resin as the air cleaner case 12 and the cap portion 13. The air cleaner 14 has a well-known structure and has, for example, a corrugated filter section made of a synthetic fiber nonwoven fabric, filter paper, or the like.

An air inlet 15 projecting in a direction parallel to the cylinder row direction of the internal combustion engine 10 is integrally formed on one side surface (a portion near the internal combustion engine 10) of the air cleaner case 12, and the air inlet 15 is provided on the vehicle. This is for introducing air (outside air) in the engine room into the case 12.
Then, the air introduced from the air inlet 15 passes through the filtration section of the air cleaner 14 as shown by the arrow b in FIG. 1, so that dust and the like in the air are removed by the air cleaner 14 and the air is purified.

Therefore, in FIG.
Is a dust side space 16 and the right side of the air cleaner 14 is a clean side space 17. An outlet hole 17a is opened downward at a portion of the air cleaner case 12 located on the clean side space 17 side and at a substantially central portion in the engine cylinder row direction.

One end (upper end) 18a of a resin-made tubular outlet duct 18 is connected to the outlet hole 17a. The outlet duct 18 has a shape in which one end (upper end) 18a and the other end (lower end) 18b are radially expanded outward in a flange shape. Here, the other end (lower end) 18b of the outlet duct 18 is shown in FIG.
As shown in the figure, the outlet hole 18c is formed in a rectangular shape and is outwardly expanded, and is provided at the center of the other end (lower end) 18b.
(FIG. 4).

The rectangular lower end 18 of the outlet duct 18
A throttle body 19 formed of a metal such as aluminum is disposed further below b. Inside the throttle body 19, a throttle valve 20 (FIG. 1,
4 and 7) are arranged so as to be rotatable around the shaft 21. As is well known, the throttle valve 20 is operated by an accelerator mechanism of the vehicle to adjust the amount of intake air taken into the internal combustion engine 10.

On the other hand, on the downstream side (lower side) of the throttle body 19, a resin surge tank 22 for increasing the volume of the space on the downstream side of the throttle body 19 is arranged so as to reduce the intake pulsation. An inlet end 22 a is formed on the upper surface of the surge tank 22.
“a” protrudes in a rectangular shape toward the throttle body 19 side, and has a circular entrance hole 22b formed in the center thereof. The fastening structure between the throttle body 19 and the outlet duct 18 and the surge tank 22 will be described later.

As shown in FIG. 1, the surge tank 22 is located on the lower side at a portion opposite to the internal combustion engine 10, and the surge tank 22 is located in the cylinder row direction of the internal combustion engine 10 (the left-right direction in FIG. 2). ).
As shown in FIG. 1, a resin intake manifold pipe 24 is disposed from the side of the surge tank 22 on the engine side and below the air cleaner case 12 toward the intake port 10 b of the internal combustion engine 10. Here, since the internal combustion engine 10 of this example is of a four-cylinder type, the number of intake manifold pipes 24 is four, and the inlet (lower end) of each intake manifold pipe 24 is a space in the surge tank 22. Open to.

The four intake manifold pipes 24 are formed into a curved shape as shown in FIG. 1, and a flange 25 serving as a mounting portion is formed at the outlet (upper end) of the intake manifold pipe 24 by a resin. It is integrally molded. The flange portion 25 has a flat plate shape along the mounting surface 10c of the internal combustion engine 10, and a plurality of bolt-shaped male screw members (not shown) projecting toward the flange portion 25 are mounted on the mounting surface 10c. Have been. On the other hand, the flange portion 25 is provided with a plurality of mounting holes (not shown) for inserting the male screw member. Then, by fastening a nut (not shown) to the male screw member inserted into the mounting hole, the flange portion 25 is tightened to the mounting surface 10c of the internal combustion engine 10, thereby fixing the entire intake device 11 to the internal combustion engine 10. It is supposed to.

In this embodiment, as shown in FIG. 1, the intake manifold pipe 24 is divided into upper and lower divided bodies 240 and 241 and molded with resin, and then joined integrally. The bottom part 120 of the air cleaner case 12 and the upper part 220 of the surge tank 22 are integrally formed on the upper divided body 240. The flange 25, the bottom 121 of the air cleaner case 12, and the lower part 221 of the surge tank 22 are integrally formed on the lower divided body 241.

In the intake device 11 arranged adjacent to the side of the internal combustion engine 10, the air cleaner case 1
2. The outlet duct 18, the surge tank 22, the intake manifold pipe 24, the flange portion 25, etc. are all formed by resin molding, and these portions are integrally formed or integrally connected by appropriate joining means, fastening means and the like. The metal throttle body 19 is connected to the outlet duct 18.
The intake system components are assembled as a single unit by being integrally fastened to the surge tank 22 by means described later.

Although not shown, a mounting hole for a fuel injection valve is formed in the flange portion 25 in correspondence with each of the four intake manifold pipes 24, and the fuel injection valve is inserted into the mounting hole. It is detachably fixed. As is well known, the fuel injection valve is an electromagnetic fuel injection means whose valve opening time is automatically controlled by an internal combustion engine electronic control unit, and is an outlet side of each intake manifold pipe 24 (in other words, the intake port 10b of the internal combustion engine 10). Fuel (gasoline) is injected into each of the parts (upstream side).

Next, the fastening structure of the throttle body 19, which is an essential part of the present invention, will be described in detail. The throttle body 19 has a bearing hole 19 for rotatably bearing a shaft 21.
The throttle body 19 is preferably made of a metal such as aluminum which has a small amount of deformation with respect to the load and has high rigidity. By selecting a high material, the throttle body 19 can be made of resin.

The throttle body 19 has one end (upper end) 19a fastened to the rectangular lower end 18b of the outlet duct 18 and the other end (lower end) fastened to the rectangular inlet end 22a of the surge tank 22. ) 19b, and one end 19a and the other end 19b are both formed in a flat rectangular shape. Therefore, the overall shape of the throttle body 19 is a rectangular thin plate (flat plate) as shown in FIG. 8, and more specifically, the axial direction of the shaft 21 (the axial direction of the bearing holes 19c and 19d). Has a rectangular thin plate shape extending in the long side direction. One end 19a and the other end 19b of the throttle body 19 have the same area as the lower end 18b and the inlet end 22a.

At the center of the throttle body 19, a circular passage hole 19e penetrating the thickness direction thereof is provided. The diameter of the passage hole 19e is determined by the size of the outlet hole 18c of the outlet duct 18 and the surge tank 22. And the same as the entrance hole 22b. Shaft 21 of throttle valve 20
Are rotatably supported by the bearing holes 19c and 19d through the passage hole 19e, and the bearing holes 19c and 19d.
The two ends of the shaft 21 are arranged to protrude from the side of the throttle body 19 from the side d.

The outer peripheral surface of the shaft 21 and the bearing holes 19c, 1
Elastic shaft sealing device 2 made of rubber
1a is arranged. Incidentally, in FIG.
d, only the elastic shaft sealing device 21a is shown in a cross-sectional view.
Is arranged. A valve drive lever 26 that forms a throttle valve drive mechanism is provided at a protruding portion at one end of the shaft 21.
And return spring 27 of throttle valve 20
Are connected. In addition, a rotary potentiometer 28 forming a throttle valve opening detecting mechanism is connected to a protruding portion at the other end of the shaft 21. Further, a pressure sensor 29 is disposed on the side of the throttle body 19 opposite to the internal combustion engine 10, and this pressure sensor 29 detects an intake pressure (intake negative pressure) downstream of the throttle valve 20. . The detection signals of the potentiometer 28 and the pressure sensor 29 are input to an electronic control unit (not shown) of the internal combustion engine 10.

The flat end 19a and the other end 19b of the throttle body 19 are connected to the lower end 18b of the outlet duct 18 and the inlet end 22a of the surge tank 22.
And a circular mounting hole 30 (FIG. 8) penetrating from one end 19a to the other end 19b at four corners of the throttle body 19. is there. These four mounting holes 30 are for inserting bolts (fastening means) 31.

As shown by a broken line in FIG. 7, the rectangular lower end 18b of the outlet duct 18 and the surge tank 2
The two rectangular inlet ends 22a are respectively provided with bolts 31 at the same positions as the mounting holes 30 at the four corners of the throttle body 19.
A mounting hole 32 and a mounting hole 33 for insertion are provided, and a bottom of the rectangular inlet end 22a of the surge tank 22 is provided at the bottom.
A nut 34 is built in the same position as the mounting hole 33 by insert molding.

As shown in FIG. 8, a cylindrical guide 35 protruding from the plane of one end 19a of the throttle body 19 is formed at the outer edge of the passage hole 19e. Protrusions 35a are formed at two symmetrical positions in the direction. As shown in FIG. 7, the same cylindrical guide portion 36 and the same convex portion 36a are formed on the other end portion 19b side of the throttle body 19 as well.

On the other hand, the rectangular lower end portion 18 of the outlet duct 18
b on the inner peripheral surface of the outlet hole 18c.
5 and concave portions 18d and 18e (FIG. 7) into which the convex portions 35a are fitted, and the cylindrical guide is also formed on the inner peripheral surface of the entrance hole 22b of the rectangular entrance end 22a of the surge tank 22. The concave portion 22 in which the portion 36 and the convex portion 36a fit.
c, 22d (FIG. 7) are formed. Here, the recess 18
e and 22d are small concave portions into which the convex portions 35a and 36a are fitted.

The rectangular lower end 18 of the outlet duct 18
4B, a circular groove 18f (FIGS. 4 and 7) is formed at a predetermined position on the outer peripheral side of the outlet hole 18c, and the outer peripheral side of the inlet hole 22b of the rectangular inlet end 22a of the surge tank 22 is formed. A circular concave groove 22e is also formed at a predetermined site,
O-rings (elastic sealing materials) 37 and 38 made of rubber are accommodated in these circular concave grooves 18f and 22e, respectively.

Next, a method of fastening the throttle body 19 will be described. As shown in FIG.
The recess 22 of the entrance hole 22b of the second rectangular entrance end 22a
The cylindrical guide portion 36 and the convex portion 36a on the other end portion 19b side of the throttle body 19 are fitted into c and 22d, respectively. By fitting the cylindrical guide portion 36 and the concave portion 22c, the positioning of the passage hole 19e of the throttle body 19 and the inlet hole 22b of the surge tank 22 in the radial direction can be performed, and the convex portion 36a and the concave portion 22d can be positioned. Can be positioned in the circumferential direction between the holes 19e and 22b.

Next, while maintaining the above-mentioned fitted state, the cylindrical guide portion 35 and the convex portion 35a on the one end portion 19a side of the throttle body 19 are connected to the outlet hole 18c of the outlet duct 18.
In the recesses 18d and 18e. The fitting of the cylindrical guide portion 35 and the concave portion 18d allows the passage hole 19e of the throttle body 19 and the outlet hole 18 of the outlet duct 18 to be formed.
c can be positioned in the radial direction, and the two holes 19e, 18
Positioning in the circumferential direction between c can be performed. Due to such positioning action, the three members 18, 19, 2
The two holes 18c, 19e, and 22b can be arranged on the same center, and the mounting holes 30, 32, and 33 of each member can be positioned at the same position.

Therefore, these mounting holes 30, 32, 33
The bolt 31 can be easily inserted into the nut 3 at the bottom of the rectangular inlet end 22a of the surge tank 22.
4 can be fixed. By tightening and fixing the bolts 31, the flat ends 19 of the throttle body 19 are
a and 19b abut the lower end 18b of the outlet duct 18 and the inlet end 22a of the surge tank 22 while elastically compressing the O-rings 37 and 38, respectively, and connect the throttle body 19 to the lower end 18b of the outlet duct 18. It can be sandwiched and fixed between the surge tank 22 and the inlet end 22a in a sandwich shape. At this time, the airtightness of each contact surface can be reliably maintained by the O-rings 37 and 38 which are elastically compressed.

Next, the operation of the intake system as a whole in the above configuration will be described. When the internal combustion engine 10 is operated, outside air is drawn in from the air inlet 15 of the air cleaner case 12, and the suctioned air flows into the dust-side space 16 in the case 12. b
Passes like As a result, dust and the like in the air are removed by the air cleaner 14, and the intake air is cleaned.

Next, the cleaned intake air flows from the space 17 on the clean side through the outlet duct 18 to the throttle body 19, where the flow rate is adjusted by the throttle valve 20. Next, the intake air passes through the surge tank 22 to absorb the pulsation, and thereafter, the intake air is distributed to the four intake manifold pipes 24. On the other hand, the fuel is distributed to each fuel injection valve via a fuel supply pump (not shown) and a fuel supply pipe. The fuel is injected into the outlet side of each intake manifold pipe 24 by appropriately opening each fuel injection valve by electronic control. Therefore, the fuel and the air become a mixture, and are sucked into each cylinder from the intake port 10b of the internal combustion engine 10.

In the throttle body 19, a valve drive lever 26 serving as a throttle valve drive mechanism is connected to one end of a shaft 21 of the throttle valve 20, and an accelerator mechanism of the vehicle is connected to the valve drive lever 26 via a cable or the like. Since it is mechanically connected, the amount of rotation (opening) of the throttle valve 20 is adjusted according to the amount of operation of the accelerator mechanism, and the amount of intake air is adjusted.

At the same time, the opening of the throttle valve 20 is detected by a rotary potentiometer 28 connected to the other end of the shaft 21 and is inputted to an electronic control unit (not shown) of the internal combustion engine. Further, an intake pressure on the downstream side of the throttle valve 20 is detected by a pressure sensor 29 disposed on the throttle body 19 and is input to the control device.

(Second Embodiment) FIGS. 9 to 13 show a second embodiment in which the positioning structure of the throttle body 19, the outlet duct 18 and the surge tank 22 is changed from the first embodiment. It is. That is, in the second embodiment, as shown in FIG. 13, a positioning pin 40 projecting upward is provided at the inlet end 22 a of the surge tank 22.
Individually protruded. These two positioning pins 40 are O
It is located on the outer peripheral side with respect to the ring 38, and is arranged at a 180 ° symmetrical position about the center of the entrance hole 22b.

At the lower end 18b of the outlet duct 18, two similar positioning pins 41 are formed so as to protrude downward as shown in FIG.
Are also arranged at 180 ° symmetrical positions on the outer peripheral side of the O-ring 37. On the other hand, one end 19a of the throttle body 19
And two circular recesses 42 and 43 (FIGS. 11 and 12) are provided on the flat surface of the other end 19b.
Each of the circular recesses 42 and 43 corresponds to the positioning pin 4 described above.
0 and a position corresponding to the positioning pin 41,
The pins 40 and 41 have a diameter that allows them to be inserted.

Therefore, according to the second embodiment, the positioning pin 40 of the surge tank 22 is inserted into the circular recess 43 of the other end 19b of the throttle body 19, and the positioning pin 41 of the outlet duct 18 is connected to the throttle body 19. By inserting the throttle body 19 into the circular recess 42 of the one end 19a, positioning between the throttle body 19, the outlet duct 18 and the surge tank 22 can be performed, and the same effect as in the first embodiment can be obtained. The points other than the structure for positioning the throttle body 19 are the same as those of the first embodiment.

(Third Embodiment) FIGS. 14 to 23 show a third embodiment, in which the form itself of the throttle body 19 is greatly changed from the first and second embodiments. That is, in the third embodiment, the lower part 18b of the outlet duct 18 and the surge tank 22 serve as a basic function of the throttle body 19 only as a support function of the shaft 21 of the throttle valve 20 and as a function of forming a passage around the throttle valve 20. Of the surge tank 22 when the throttle valve 20 is fully closed, and the inner surface of the inlet hole 22b of the surge tank 22 at the inlet end 22a.

Therefore, in the third embodiment, FIGS.
As shown in FIG. 2, the throttle body 19 is composed of first and second block bodies 190 and 191 which are divided into two at both axial ends of the shaft 21 of the throttle valve 20. The first and second block bodies 190, 191
Is made of a metal such as aluminum, and has main portions 190a and 191a each having a rectangular cross-sectional shape, and flange portions 190b and 191b each having a rectangular flat plate shape.

The bearing holes 19c and 19d are formed inside the main body portions 190a and 191a, and the elastic shaft sealing device 2 is formed.
1a is arranged. Also, the main body portions 190a, 191a
Gaskets (elastic sealing materials) 192 and 193 for sealing made of rubber are respectively disposed on the outer surfaces of the rubber members.
The overall shape of the sealing gaskets 192 and 193 is a rectangular shape along the outer shape of the main body portions 190a and 191a, and the cross-sectional shape thereof is a chevron shape whose center in the width direction is high.

On the other hand, shaft support portions 44 and 45 are provided on the lower end portion 18b of the outlet duct 18 toward the throttle body 19 (the shaft 21 side of the throttle valve 20).
Project in parallel, and the shaft support portions 44, 45
Are located on the inner side of the axial end surfaces of the main body portions 190a and 191a of the first and second block bodies 190 and 191 described above.

Further, semi-circular shaft receiving portions 44a, 45a for directly supporting the upper semi-peripheral surface of the shaft 21 are formed at the distal ends of the shaft supporting portions 44, 45. Further, the sealing gasket 1 is provided at the lower end portion 18b.
Recessed grooves 46, 47 having a cross-sectional shape along this gasket cross-sectional shape are formed so that the upper sides of the 92, 193 are fitted.

Next, the inlet end 22a of the surge tank 22
20 and 23 will be described. In this example,
By increasing the height of the inlet end 22a, the main body 190a, 1
Concave portions 48 and 49 having a size capable of accommodating 91a are formed, and the end face 22a 'of the inlet end 22a is in direct contact with the lower end 18b of the outlet duct 18. On the side and bottom surfaces of the recesses 48 and 49, concave grooves 50 and 51 having a cross-sectional shape along the gasket cross-sectional shape so that the side and bottom portions of the sealing gaskets 192 and 193 are fitted. Are formed.

In the end face 22a 'of the inlet end 22a, arc-shaped concave grooves 52, 53 into which the O-ring 37 is fitted are provided.
Are formed concentrically with the inlet hole 22b. This groove 5
2 and 53 are divided into two parts by recesses 48 and 49. The concave grooves 190c and 191c corresponding to the divided portions of the concave grooves 52 and 53 are provided in the main body portions 190a and 191a of the first and second block bodies 190 and 191.

At the entrance end 22a, the recess 4
A semicircular shaft receiving portion 54 that directly supports the lower semicircular surface on the lower side of the shaft 21,
55, and the shaft receiving portions 54, 55
Are formed with concave portions 56 and 57 in which the shaft support portions 44 and 45 of the lower end portion 18b of the outlet duct 18 are fitted.

A positioning pin 58 is formed at one corner of the end face 22a 'of the inlet end 22a so as to protrude therefrom. The positioning pin 58 is formed at the lower end 18b of the outlet duct 18.
Circular recess 5 into which positioning pin 58 is fitted at the corresponding position of
9 (FIGS. 18 and 19) are formed. As shown in FIGS. 21 and 22, etc., mounting holes 60 and 61 are formed in four rectangular corners of the flange portions 190b and 191b of the first and second block bodies 190 and 191. Tapping screws (fastening means) 62 and 63 are attached to the side faces of the lower end 18 b of the outlet duct 18 and the side faces of the inlet end 22 a of the surge tank 22 through mounting holes 6.
4 and 65 (FIG. 19), and the first and second
The block bodies 190 and 191 are connected to the outlet duct 18 and the surge tank 22.

Next, the assembling method of the third embodiment will be described. First, the throttle body 19 is assembled in the state shown in FIG. That is, the first and second block bodies 1
A shaft 21 connected to the throttle valve 20, a valve driving lever 26, a return spring 27, a potentiometer 28, and the like are assembled to 90 and 191. Thereafter, the main body 19 of the first and second block bodies 190 and 191
0a and 191a are connected to the inlet end 22a of the surge tank 22.
Are housed in the recesses 48 and 49. At this time, the main body 19
0a, 191a, the side and bottom sides of the sealing gaskets 192, 193 are formed on the side and bottom surfaces of the recesses 48, 49, respectively.
0, 51 are fitted. At the same time, the lower semi-peripheral surface of the shaft 21 is fitted into the semicircular shaft receiving portions 54 and 55 located inside the recesses 48 and 49 in the axial direction.

Next, the arc-shaped concave grooves 52, 53 on the end face 22a 'of the entrance end 22a, the first and second block bodies 190,
191 main body portion 190a, arc-shaped concave groove 1 on the upper surface of 191a
The O-ring 37 is fitted into one circular concave groove formed by 90c and 191c. Next, the shaft support portions 46 and 47 of the lower end portion 18b of the outlet duct 18 are the first and second shaft support portions.
Body portions 190a, 191a of block bodies 190, 191
So that the lower end 18b of the outlet duct 18 is connected to the inlet end 22a of the surge tank 22,
Assembled to the first and second block bodies 190 and 191. At this time, a positioning pin 58 provided at one corner of the end face 22a 'of the inlet end 22a is attached to the outlet duct 1
The circular recess 59 of the lower end portion 18b of the nozzle 8 is fitted to position the inlet end 22a and the outlet duct 18.

In the process of assembling the outlet duct 18, the semicircular shaft receiving portions 44 a and 45 a of the shaft supporting portions 46 and 47 are fitted to the upper semi-peripheral surface of the shaft 21 and the outlet duct 18. The end surface of the lower end portion 18b of the O-ring 37 is in contact with the upper surface of the O-ring 37.
6 and 47 are fitted to the upper sides of the sealing gaskets 192 and 193.

Next, the bolt 31 is passed through the mounting hole 32 (FIG. 15) of the lower end 18b and the mounting hole 33 (FIGS. 15 and 23) of the inlet end 22a, and is inserted into the insert nut 34 (FIG. 15) of the inlet end 22a. The lower end 18 b of the outlet duct 18 is screwed into the inlet end 22 of the surge tank 22.
a. Due to the fastening of the bolt 31, the O-ring 37 and the sealing gaskets 192, 193 are elastically compressed, and the gap between the end face of the lower end 18b of the outlet duct 18 and the end face 22a 'of the inlet end 22a of the surge tank 22 is formed. Sealing action, and first and second block bodies 190,
191 of main body portions 190a, 191a and outer surface and lower end portion 18
b and a sealing effect between the inlet end 22a.

Next, the tapping screws 62 and 63 are
Flange 19 of first and second block bodies 190 and 191
0b, 191b through the mounting holes 60, 61, the lower end 1
Mounting holes 64 in the side surface of the inlet end 22a and the side surface 8b.
65, the first and second blocks 19
0 and 191 are connected to the outlet duct 18 and the surge tank 22. The assembly can be completed as described above, and FIGS.
The throttle body fastening structure shown in FIG. (Other Embodiments) In the first to third embodiments,
As the throttle valve 20, a mechanical drive type operated by a drive lever 34 mechanically connected to an accelerator mechanism of a vehicle has been described.
Also, an electronically controlled throttle valve that has an electric actuator mechanism such as a motor as a drive mechanism of 0 and electrically controls an operation amount of the electric actuator mechanism according to an operation amount of an accelerator mechanism of a vehicle, It goes without saying that the present invention can be carried out well.

In the third embodiment, the surge tank 2
In the recesses 48, 49 formed at the entrance end 22a of the second, the main body 190a of the first and second block bodies 190, 191,
191a, but the lower end 1 of the outlet duct 18
8b, the lower end 18b has a recess 4
8 and 49 are formed, and the recesses 48 and 4 on the lower end portion 18b side are formed.
9, the main body 1 of the first and second block bodies 190 and 191
90a and 191a can also be accommodated.

The point is that the recess 4 formed between the end 18b of the outlet duct 18 and the end 22a of the surge tank 22
The main body portions 190a, 191a of the first and second block bodies 190, 191 may be accommodated in 8, 49.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an intake device of an internal combustion engine showing a first embodiment of the present invention, and shows a cross section taken along line AA of FIG.

FIG. 2 is a partial cross-sectional front view of the intake device of FIG. 1;

FIG. 3 is a side view of a main part of the intake device of FIG. 1;

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a top view of FIG. 3;

FIG. 6 is an exploded view of FIG.

FIG. 7 is a sectional view taken along the line CC of FIG. 6;

FIG. 8 is a perspective view of the upper surface side of the throttle body of FIG. 7;

FIG. 9 is a side view of a main part of an intake device according to a second embodiment of the present invention.

FIG. 10 is a sectional view taken along line EE of FIG. 9;

FIG. 11 is an exploded view of FIG. 9;

FIG. 12 is a sectional view taken along line FF of FIG. 11;

FIG. 13 is a view taken in the direction of arrows GG in FIG. 12;

FIG. 14 is a longitudinal sectional view of an intake device according to a third embodiment of the present invention, showing a section taken along line HH of FIG. 15;

FIG. 15 is a partial cross-sectional front view of the intake device of FIG. 14;

FIG. 16 is a side view of a main part of the intake device of FIG. 14;

FIG. 17 is a sectional view taken along the line II of FIG. 16;

FIG. 18 is a top view of FIG.

FIG. 19 is an exploded view of FIG.

20 is a sectional view taken along the line JJ of FIG. 19;

21 is a view as viewed in the direction of arrows KK in FIG. 20.

FIG. 22 is a top view of the throttle body unit alone as viewed from arrows KK in FIG. 20;

FIG. 23 is a view taken along the line LL in FIG. 20;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Internal combustion engine, 11 ... Intake device, 12 ... Air cleaner case, 13 ... Cap member, 14 ... Air cleaner, 1
8 outlet duct, 18b lower end, 19 throttle body, 19a one end, 19b other end, 20 throttle valve, 21 shaft, 22 surge tank, 2
2a: Inlet end.

Claims (7)

[Claims] An outlet duct (1) located on the outlet side of an air cleaner (14) for filtering intake air to an internal combustion engine (10).
8), a throttle body (19) provided downstream of the outlet duct (18) in the air, and having a built-in throttle valve (20) for adjusting the amount of intake air to the internal combustion engine (10); 19) An intake device for an internal combustion engine comprising a surge tank (22) provided downstream of the air, wherein the throttle body (19) is connected to the outlet duct (1).
8) and the other end (19b) fastened to the surge tank (22) are both flat, and the one end (19a) of the throttle body (19) is flat.
The flat surface of the other end (19b) is connected to the end (18) of the outlet duct (18) and the surge tank (22).
b, 22a), respectively, and connects the throttle body (19) to the end (18b) of the outlet duct (18).
And an end (22a) of the surge tank (22) sandwiched and fixed in a sandwich-like manner. 2. The flat surface of the one end (19a) and the other end (19b) of the throttle body (19) are formed parallel to each other.
An intake device for an internal combustion engine according to claim 1. 3. A mounting hole (30) penetrating between a flat surface of the one end (19a) and the other end (19b) of the throttle body (19). The throttle body (19) is connected to the end (18b) of the outlet duct (18) and the surge tank (2) by a fastening means (31) penetrating therethrough.
The intake device for an internal combustion engine according to claim 1 or 2, wherein the intake device (2) is fastened to an end (22a). 4. A positioning means (18d) for positioning a fastening position of said throttle body (19) to said outlet duct (18) and said surge tank (22).
18e, 22c, 22d, 35, 35a, 36, 36
a) the end (19a) of the throttle body (19) and the end (18b) of the outlet duct (18).
And the other end (19b) of the throttle body (19) and the end (2) of the surge tank (22).
4. The intake device for an internal combustion engine according to claim 1, wherein the intake device is provided between the intake device and the second intake device. 5. The end (19a) of the throttle body (19) and the end (18) of the outlet duct (18).
b) and between the other end (19b) of the throttle body (19) and the end (22a) of the surge tank (22).
The intake device for an internal combustion engine according to any one of claims 1 to 4, wherein (8) is arranged. 6. A throttle body (19) including a throttle valve (20) for adjusting an amount of intake air to an internal combustion engine (10), wherein the air cleaner (14) filters intake air to the internal combustion engine (10). One end (19a) fastened to an outlet duct () located on the outlet side of the engine and the other end (19b) fastened to a surge tank (22) for reducing pulsation of intake air to the internal combustion engine (10). The one end (19a) and the other end (19b) can be respectively brought into contact with the end (18b) of the outlet duct (18) and the end (22a) of the surge tank (22). The one end (19a) and the other end (19b) having the flat shape are respectively connected to the outlet duct (1).
8) End (18b) and the surge tank (22)
A throttle body for an internal combustion engine, characterized in that it is configured as a mounting surface that can be sandwiched and fixed between the end portion (22a) of the internal combustion engine. 7. An outlet duct (1) located on an outlet side of an air cleaner (14) for filtering intake air to an internal combustion engine (10).
8), a throttle body (19) provided downstream of the outlet duct (18) in the air, and supporting a throttle valve (20) for adjusting the amount of intake air to the internal combustion engine (10); 19) an intake device for an internal combustion engine including a surge tank (22) provided on the downstream side of the air, wherein the throttle body (19) is a first block body (19).
0) and a second block body (191), the first block body (190) and the second block body (19).
1) has a main body (1) supporting one end of a shaft (21) for rotating the throttle valve (20).
90a) and a main body (191a) for supporting the other end of the shaft (21), and an end (18b) of the outlet duct (18) and an end (22a) of the surge tank (22). In the recesses (48, 49) formed between the first and second block bodies (1),
90, 191) and an end (18) of the outlet duct (18).
b) and an end portion (22a) of the surge tank (22) in direct contact with and fastened to the surge tank (22).