JPH11107869A - Throttle body made of resin and coupling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deformation of the valve seal surface of a throttle body made of resin even when a warp is generated at the mounting flange of the throttle body of resin when the mounting flange of the throttle body made of resin is fastened against the flange of an intake manifold. SOLUTION: In a throttle body 1 made of resin having a circular metal fitting 4 for fastening a bolt mounting in the insertion hole 5 of a mounting flange 2, the mounting flange has the throttle body 1 made of resin only one side of which is formed in a wide width and an insertion hole 5 is formed in the wide width part of a mounting flange 2. A cylindrical protrusion 22 is formed below the mounting flange 2, and an elastic seal 24 is mounted in the outer peripheral groove 23 of the cylindrical protrusion 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin throttle body and a coupling device for an internal combustion engine, and is characterized by a structure of a mounting portion of the throttle body.

[0002]

2. Description of the Related Art To reduce the weight and cost of an internal combustion engine, a throttle body is made of resin. When the resin throttle body is shrunk during molding, the mounting flange is deformed (inclined), called a warp, and a bolt-tightening ring is attached to the mounting hole of the mounting flange, and the bolt is inserted into the bolt-tightening ring. If the throttle body is fastened to the intake manifold, the bore of the throttle body is deformed due to the forced deformation of the mounting flange (for a resin throttle body with a mounting flange, see Japanese Patent Application Laid-Open No. 6-167258).

FIGS. 4A (a) and 5 (a) show a conventional resin throttle body 1 and intake manifolds 7,7.
The state before assembly with A is shown. When the flange height H ₁ of the mounting flange 2 of the conventional resin-made throttle body 1 is large, becomes greater thickness B of the resin around the bore 3, the roundness of the bore 3 after the molding is lowered, shrinkage (Cavities on the surface) and voids (cavities in the thick part) are generated, and the material cost is increased. Therefore, in order to overcome these drawbacks, smaller than the length H ₂ of the valve seal line shown flange height H ₁ of the mounting flange 2 (thinning the flange height H ₁₎ constitutes. The bolting ring brackets 4A and 4B are mounted in the insertion hole 5 of the mounting flange 2. When the bolting ring brackets 4A and 4B are mounted in the insertion hole 5 after molding, the bolts are tightened according to the warp of the mounting flange 2. The lower end surfaces of the fastening ring brackets 4A and 4B are also inclined.

The intake manifold 7 shown in FIG. 4A (a) is made of hard aluminum without deformation and has a flange.
An annular groove 19 is formed near the center hole 18 on the end face, and the annular groove 19 is formed.
The O-ring 20 is attached to the. The flange 10 has bolt holes 21A and 21B penetrating the flange 10.
FIG. 4A (b) shows a stage in the process of assembling the resin throttle body 1 to the hard intake manifold 7 made of aluminum. The first bolt 8A is inserted into the bolting ring 4A on the right side and screwed into the bolt hole 21A of the hard intake manifold 7, and the mounting flange 2 of the resin throttle body 1 is fixed to the flange of the hard intake manifold 7.
Tighten to 10. With the tightening force of the bolt 8A, the entire lower end surface of the bolt fastening ring 4A of the resin throttle body 1 comes into contact with the upper surface of the flange 10 of the intake manifold 7 and is fastened. As shown in FIG. 4A (b), the mounting flange 2 on the opposite side (left side) of the tightening portion is separated from the flange 10 of the intake manifold 7 by the amount of warp due to the warpage of the resin throttle body 1. It is in a floating state.

Next, as shown in FIG. 4B (a), when the second bolt 8B is screwed into the bolt hole 21B on the left side of the flange 10, the lower end face of the second bolt tightening ring 4B is formed. Also contacts the upper surface of the flange 10 of the intake manifold 7. When the second bolt 8B is screwed, the intake bolt 7 is tightened by the first bolt 8A.
Mounting flange 2 which is far away from the upper surface of flange 10
However, since the resin material of the resin throttle body 1 is soft and easily deformed, it is forcibly tightened to the upper surface of the flange 10 of the intake manifold 7. At this time, at the same time as the mounting flange 2 is deformed, this deforming force affects the cylindrical portion 9 of the resin throttle body 1, that is, the mounting flange 2 pulls the wall of the cylindrical portion 9 and is made of a soft and easily deformable resin material. Is deformed as shown by the solid line in FIG. 4B (a) and by the dotted line in FIG. 4B (b). FIG. 4B
As shown in (a) in an exaggerated manner, the valve seal portion of the bore 3 (the cylindrical portion for adjusting the flow rate together with the throttle valve 6) is also deformed, and the size of the gap between the throttle valve 6 and the bore 3 is increased. Changes, and the flow rate accuracy decreases. FIG. 4B (c) shows the mounting flange 2 of the resin throttle body 1.
4B is fastened to the flange 10 of the intake manifold 7 with four bolts 8, and FIGS. 4B (b) and 4 (c) show the throttle valve shaft 14.

FIG. 5A shows a throttle body 1 made of resin.
This shows a state before the resin intake body 7A (same as the resin throttle body 1 in FIG. 4A) is assembled to the resin intake manifold 7A. In this case, the rigidity of the resin intake manifold 7A is higher than that of the resin throttle body 1. In the resin-made intake manifold 7A, after the resin-made intake manifold 7A is formed, the threaded annular metal fittings 11A and 11B are attached to the insertion holes 31 of the flange 10. However, similarly to the case of the resin-made throttle body 1, the screw is formed. With ring bracket
End faces of 11A and 11B are inclined, and an O-ring 20 is mounted in the annular groove 19.

FIG. 5B shows a stage in the process of assembling the resin throttle body 1 to the resin intake manifold 7A. The first bolt 8A is inserted into the bolt tightening ring 4A on the right side of the mounting flange 2 of the resin throttle body 1 and screwed into the bolt hole of the screw ring 11A of the flange 10 of the resin intake manifold 7A. And tighten the mounting flange 2 to the flange 10. With the tightening force of the bolt 8A, substantially the entire lower end surface of the bolt tightening ring 4A of the resin throttle body 1 comes into contact with the upper surface of the threaded ring 11A of the flange 10 and is fastened. At this time, as shown in FIG. 5 (b), due to the warp of the resin throttle body 1 and the resin intake manifold 7A, the mounting flange 2 and the flange 10 on the opposite side (left side) from the tightening point are formed. Is floating by the sum of each sled.

Next, as shown in FIG. 5 (c), when the second bolt 8B is screwed into the bolt hole of the threaded ring fitting 11B of the flange 10, the second bolted ring fitting is formed. Substantially the entire lower end surface of 4B comes into contact with the upper surface of the threaded ring bracket 11B of the flange 10. And the resin intake manifold 7
A is higher in rigidity than the resin throttle body 1, so that when the second bolt 8B is screwed, the mounting flange which is considerably separated from the flange 10 of the resin intake manifold 7A by the screwing of the first bolt 8A. 2 is moved to the resin intake manifold 7A side and is fastened to the flange 10 of the resin intake manifold 7A. At this time, at the same time as the mounting flange 2 is deformed, the deformation force affects the cylindrical portion 9 of the resin throttle body 1, that is, the mounting flange 2 pulls the wall of the cylindrical portion 9, and the resin of the resin throttle body 1 Since the material is soft and easily deformed, the bore 3 deforms as shown by a solid line in FIG. As shown exaggeratedly in FIG.
Is also deformed, the size of the gap between the throttle valve 6 and the bore 3 changes, and the idle flow rate changes.

As shown in FIGS. 4B (a) and 5 (c), an upper end and a lower end of the bolt tightening ring 4 are attached to the mounting flange 2.
The height of the threaded metal fitting 11 is formed to be approximately the same as the thickness of the flange 10. Here, it is assumed that the bore 3 is deformed by the tightening of the bolts 8A and 8B, and the space between the mounting flange 2 and the flange 10 is sealed by the O-ring 20.

[0010]

SUMMARY OF THE INVENTION The present invention relates to a valve for a resin throttle body when a mounting flange of the resin throttle body is fastened to a flange of an intake manifold, even if the mounting flange of the resin throttle body has a sled. It is an object to prevent deformation of a sealing surface.

[0011]

SUMMARY OF THE INVENTION The present invention relates to a mounting flange.
In the resin throttle body (1) with the bolting ring (4) mounted in the insertion hole (5) of (2), the mounting flange (2) is on one side of the resin throttle body (1). Of the mounting flange (2), the insertion hole (5) is formed in a wide portion of the mounting flange (2), and a cylindrical projection is provided below the mounting flange (2).
(22) is formed, and the elastic seal (24) is attached to the outer peripheral annular groove (23) of the cylindrical projection (22) as a first configuration. The present invention provides a mounting flange (2) for a resin throttle body (1).
And the flange (10) of the intake manifold (7, 7A) are arranged to face each other, and the mounting flange (2) is flanged by the bolt (8) inserted into the through hole (5) of the mounting flange (2).
In the coupling device to be tightened in (10), the mounting flange
A cylindrical projection (22) is formed below (2), an elastic seal (24) is attached to the outer peripheral annular groove (23) of the cylindrical projection (22), and a cylindrical projection is formed on the intake manifold (7, 7A). A cylindrical inner sealing surface (28) or a central hole (18) into which (22) can be inserted in an inclined state,
The outer surface of the cylindrical projection (22) and the sealing surface (28) or the center hole (1
The second configuration is such that the space between the first and the second is sealed by an elastic seal (24) at all times. The present invention is directed to the second aspect.
In the configuration of (1), only one side of the mounting flange (2) and the flange (10) is formed wide, and the insertion hole (5) is formed in a wide portion of the mounting flange (2), and the flange (10) is formed. A third configuration is that a bolt hole (21) or an insertion hole is formed in the wide portion of ()). According to the present invention, in the second or third configuration, the throttle body made of resin is provided.
(1) Or the engagement manifolds (29), (29A) are provided on the other side of the intake manifold (7), (7A), and the intake manifold (7), (7A) or the resin throttle body (1) A hook portion (30) having a U-shaped cross section is formed on the other side of the flange (10), and the relative rotation of the throttle body (1) made of resin and the intake manifolds (7) and (7A) enables relative engagement. The fourth configuration is such that the joint flanges (29), (29A) are configured to be engaged with the hook portions (30). The present invention is directed to the fourth aspect.
In the fifth configuration, the rigidity of one or both of the engagement flanges (29), (29A) and the hook portion (30) is made smaller than the rigidity of the other portion. According to the present invention, the mounting flange (2) of the resin throttle body (1) and the flange (10) of the intake manifold (7), (7A) are arranged to face each other, and the insertion hole (5) of the mounting flange (2) is provided. ) Bolt inserted
In a coupling device where the mounting flange (2) is fastened to the flange (10) by (8), the mounting flange (2) and the flange
(10) is sealed by an elastic seal member (40), and the mounting flange (2) and the flange (10) are tightened by bolts (8) only on one side and the engaging flange on the other side. (2
The sixth configuration is that the engagement is performed with the hook 9 and the hook 30 and the rigidity of one or both of the engagement flange 29 and the hook 30 is smaller than the rigidity of the other portion. According to the present invention, in the sixth configuration, the mounting flange (2) and the flange
In (10), only one side is formed wide, and an engagement flange (29) is disposed on the other side of the resin throttle body (1) or the intake manifold (7), (7A), and the intake manifold ( 7) that the hook portion (30) having a U-shaped cross section was formed on the other side of the throttle body (1) or the resin throttle body (1).
Configuration.

[0012]

1A and 1B show a first embodiment of a resin throttle body and a coupling device according to the present invention. In the first embodiment, the same members as those of the conventional example shown in FIGS. 4A to 5 are denoted by the same reference numerals as those of the conventional example, and the description thereof will be simplified or omitted. As shown in FIGS. 1A (a) and 1 (b), in the resin throttle body 1, the mounting flange 2 is wide only on one side (the right side in FIG. 1A) of the resin throttle body 1 and on the other side (in FIG. 1A). The left side is formed narrow, and the mounting flange 2 has a sled and is inclined. In FIG. 1A (a), the outer shape of the mounting flange 2 is an arc (semicircle) at the left end and a rectangular shape at the other end.
A cylindrical portion 9 is integrally formed on the left part of the mounting flange 2 to form an inner shape of the mounting flange 2. Thick portions 2A are provided on both sides of the throttle valve shaft 14 in a wide portion of one side of the mounting flange 2, and insertion holes 5 are formed in the two thick portions 2A, respectively. At least a predetermined distance away from the inner wall (two places) is provided, and a bolt-fastening ring 4 is attached to each insertion hole 5.

A cylindrical projection 22 is formed below the mounting flange 2, an outer peripheral annular groove 23 is formed below the cylindrical projection 22, and an elastic seal 24 is mounted in the outer peripheral annular groove 23. In FIG. 1A (b), the inner diameter of the cylindrical projection 22 is the same as the inner diameter of the cylindrical portion 9 and the thickness is also the same. However, such a limitation is not required. The diameter may be smaller than the cylindrical portion 9. FIG. 1A
As shown in (a), when an accelerator cable is hooked on a pulley 33 connected to an end of the throttle valve shaft 14 and an accelerator pedal (not shown) is depressed, a force for pulling and opening the mounting flange 2 is applied. Therefore, the pulley 33 is disposed on one side of the resin throttle body 1 and the mounting flange 2 is mounted.
One or two bolting ring brackets 4 are arranged in a wide portion on one side.

As shown in FIG. 1A (b), a cylindrical inner sealing surface 28 is formed in the opening of the central hole 18 of the intake manifold 7 made of aluminum. The entire cylindrical projection 22 of the resin throttle body 1 can be inserted into the sealing surface 28 in the cylinder,
Moreover, when the cylindrical projection 22 is inserted in a straight or inclined state, the elastic seal 24 of the cylindrical projection 22 is always in contact with the inner surface of the cylindrical inner sealing surface 28, and the outer surface of the cylindrical projection 22 and the cylindrical inner sealing surface
It is sized so that the space between the inner surface and the inner surface is always sealed.
Further, one side of the flange 10 of the intake manifold 7 is wide like the mounting flange 2, and two bolt holes 21 are formed in the wide part of one side of the flange 10, and the bolt holes 21 are formed. Is separated from the inner wall (two places) of the central hole 18 by a predetermined distance or more. The flange 10 of the intake manifold 7 and the like are cut to have a very good flatness, and the flange 10 has no warp. Further, the resin throttle body 1 may be assembled to the intake manifold 7 having the central hole 18 having the same inner diameter as the cylindrical inner seal surface 28 without forming the cylindrical inner seal surface 28 on the intake manifold 7.

FIG. 1B (a) shows a throttle body 1 made of resin.
Is shown assembled on an intake manifold 7 made of aluminum. The cylindrical projection 22 of the resin throttle body 1 is inserted into the cylindrical inner sealing surface 28 of the intake manifold 7. The bolting ring 4 of the mounting flange 2 is arranged at a position opposite to the bolt hole 21 of the flange 10, and the two bolts 8 inserted into the bolting ring 4 of the mounting flange 2 are connected to the flange 10. Are screwed into the two bolt holes 21 respectively. One side of the mounting flange 2 is fastened to one side of the flange 10 of the intake manifold 7, and the entire lower end face of the bolt tightening ring 4 is in contact with the upper surface of the flange 10 of the intake manifold 7. Since the mounting flange 2 of the resin throttle body 1 has a warp, the cylindrical projection 22 is inclined in the sealing surface 28 in the cylinder (FIG. 1B).
In (a), the left side of the mounting flange 2 and the left side of the flange 10 are separated from each other). Due to the inclination, the pulling force does not act on the bore 3 of the resin throttle body 1, and the deformation (distortion) of the valve seal surface is reduced. can avoid. In FIG. 1B (a), the inclination of the cylindrical projection 22 is exaggerated, and the entire surface of the elastic seal 24 comes into contact with the sealing surface 28 in the cylinder.
And the central hole 18 are sealed from the outside.

FIGS. 1B (b) and 1 (c) show an example in which only the intake manifold 7 made of aluminum in the first embodiment is changed to an intake manifold 7A made of resin. In this example, there is a warp on the surface of the flange 10 of the intake manifold 7A made of resin.
10 is inclined. An insertion hole 31 is formed in a wide portion on one side of the flange 10 of the intake manifold 7A, and a threaded metal fitting 11 is mounted in the insertion hole 31. The position of the threaded metal fitting 11 is shown in FIG. (b) Bolt hole of flange 10
Same as position 21. FIG. 1B (c) shows a state in which the resin throttle body 1 is assembled to a resin intake manifold 7A. In this example, the mounting flange 2 of the resin throttle body 1 and the flange 10 of the resin intake manifold 7A are connected. Since both are inclined, the inclination angle of the cylindrical projection 22 is larger than that of the first embodiment of FIG. 1B (a). Other aspects of this example are the same as in the first embodiment.

2A to 2C show a second embodiment of the resin throttle body and the connecting device according to the present invention. In the description of the second embodiment, the same members as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and the description thereof will be simplified or omitted. As shown in FIGS. 2A (a) and 2 (b), the second resin throttle body 1 of the second embodiment has an engagement flange 29 formed on the other side of the first resin throttle body 1 of the first embodiment. It is a thing. This engagement flange 29
Is a rectangular plate-like body having a small thickness and low rigidity, and is located on the same plane as the lower surface of the engaging flange 29 and the lower surface of the mounting flange 2. The mounting flange 2 and the engaging flange 29 are integrated. I have. As shown in FIGS. 2A (c), 2 (d) and 2 (e), the second resin intake manifold 7A of the second embodiment is the same as the first intake manifold 7 of the first embodiment.
A hook 30 having a U-shaped cross section is formed on the other side of the flange 10 (opposite the bolt hole 21).
Is the same length as the width of the engagement flange 29. Hook part 30
An engagement groove 34 is formed on the inner surface of the hook.
The lower surface of the engaging groove 34 of the hook portion 30 is located on the same plane as the surface of the flange 10 of the intake manifold 7A. As shown in FIG. 2C, only one side of the intake manifold 7A of the flange 10 is formed to be wide and the other side thereof is formed to be narrow.

FIG. 2B (a) shows a throttle body 1 made of resin.
Is assembled to the intake manifold 7A made of resin. When assembling, set the throttle body 1 made of resin.
Is inserted into the sealing surface 28 inside the cylinder of the intake manifold 7A made of resin, and the engagement flange 29 of the throttle body 1 made of resin and the hook portion 30 of the intake manifold 7A are shifted in a top view. Deploy. Next, the resin throttle body 1 and the intake manifold 7
A is relatively rotated to engage the engagement flange 29 with the engagement groove 34 of the hook portion 30. The bolting ring fitting 4 of the mounting flange 2 is disposed at a position opposite to the threaded ring fitting 11 of the flange 10, and the two bolt fitting ring fittings 4 of the mounting flange 2 inserted into the bolting ring fitting 4. The bolts 8 are screwed into the bolt holes of the two threaded annular fittings 11 of the flange 10, respectively, and the assembly is completed.

The upper surface of the engaging flange 29 is supported on the upper surface of the engaging groove 34 of the hook portion 30, one side of the mounting flange 2 is fastened to one side of the intake manifold 7A, and a ring-shaped metal fitting for bolt tightening is provided. Substantially the entire lower end surface of 4 is in contact with the upper surface of threaded metal fitting 11 of intake manifold 7A. At this time, the mounting flange 2 of the resin throttle body 1 and the flange 10 of the intake manifold 7A have a warp, and the fastening flange 29 having low rigidity is bent and lifted by tightening the bolt 8. Accordingly, deformation (distortion) of the bore 3 of the resin throttle body 1 and the valve seal surface can be avoided by inclining the cylindrical protrusion 22 in the cylindrical inner seal surface 28. In the second embodiment, in addition to the fastening by the bolt 8, the engagement by the engagement flange 29 and the hook portion 30 is performed, so that the connection between the resin throttle body 1 and the intake manifold 7A becomes strong, and the external force acts. Even after that, an appropriate assembly state is maintained.

FIGS. 2B (b) to 2C (d) show that, in the second embodiment, the position of the engagement flange 29 of the resin throttle body 1 is slightly moved downward so that the intake manifold 7A made of resin can be used. An example in which the shape and the position of the hook portion 30 are changed is shown. As clearly shown in FIG. 2B (c), the engagement flange 29A of the resin throttle body 1 is formed.
Has moved below the mounting flange 2 so that the distance between the throttle valve 6 and the engagement flange 29A is reduced as shown in FIG. 2A (b).
It was longer than in the case. Therefore, the engagement flange 29
When a force acts on A, the influence on the valve seal is reduced, and the valve seal is not deformed.

As shown in FIGS. 2C (a) to 2 (c), the hook portion
The upper surface of 30 is located on the same plane as the upper surface of flange 10, and the width of hook portion 30 of intake manifold 7A is about three to four times the width of engaging flange 29A. The engagement groove 34 and the passage are formed in a portion of the hook portion 30 except for both ends.
A vertical passage 35 for inserting and removing the engagement flange 29A is formed on the front side of the hook portion 30 (FIG. 2C).
In (a), it is formed on the front side). The engaging groove 34 is formed laterally adjacent to the bottom of the passage 35, and
Extending to the rear. 2C (a) and 2 (c), the upper surface of the entrance portion 36 of the engagement groove 34 is inclined downward toward the inside of the engagement groove 34.

When assembling, the cylindrical projection 22 of the resin throttle body 1 is connected to the intake manifold 7A made of resin.
And the engagement flange 29A of the resin throttle body 1 is inserted into the passage 35 of the intake manifold 7A. While pushing down the engagement flange 29A downward, the engagement flange 29 of the resin throttle body 1 is rotated clockwise by about 30 ° (see FIG. 2C (a)), and the engagement flange 29 is engaged with the engagement groove 34. As in the second embodiment, the resin throttle body 1 is assembled to the intake manifold 7A (FIG. 2C (d)).
), One side of the mounting flange 2 is fastened to one side of the intake manifold 7A. In this example, the engagement between the engagement flange 29A and the hook portion 30 is stronger than in the second embodiment, so that the connection between the resin throttle body 1 and the intake manifold 7A is further strengthened, and external force is reduced. Even if it works, an appropriate assembly state is maintained.

FIGS. 3A and 3B show a third embodiment of the resin throttle body and coupling device of the present invention. In the description of the third embodiment, the same members as those of the conventional example and the second embodiment are denoted by the same reference numerals as those of the conventional example and the second embodiment. As shown in FIG. 3A (a), a pulley 33 is connected to the end of the throttle valve shaft 14, the pulley 33 is disposed on one side of the resin throttle body 1, and the width of one side of the mounting flange 2 is increased. Two bolt tightening ring brackets 4 are disposed in the portion.

As shown in FIGS. 3A (a) and 3 (b), in the resin throttle body 1, the mounting flange 2 is formed only on one side of the resin throttle body 1 and narrow on the other side. The mounting flange 2 has a sled and is inclined. In FIG. 3A (a), the outer shape of the mounting flange 2 is an arc (semicircle) at the left end and a rectangular shape at the rest, and a cylindrical portion 9 is integrally formed on the left side of the mounting flange 2 so that the mounting flange 2
Constitutes the inner shape of. Thick portions 2A are provided on both sides of the throttle valve shaft 14 in a wide portion on one side of the mounting flange 2, and insertion holes 5 are formed in the two thick portions 2A, respectively.
The center of the insertion hole 5 is separated from the inner wall (two places) of the bore 3 by a predetermined distance or more, and the ring fastener 4 for tightening a bolt is attached to each insertion hole 5. An engagement flange 29 is formed on the other side of the resin throttle body 1. The engagement flange 29 is a square plate-like body having a protruding portion at the upper end thereof, and the plate-like body is thin and rigid. Smaller than the site. The lower surface of the engaging flange 29 and the lower surface of the mounting flange 2 are the lower end surfaces of the resin throttle body 1 and are located on the same plane, and the mounting flange 2 and the engaging flange 29 are integrated.

As shown in FIG. 3A (c), a cylindrical inner sealing surface 28 is formed at the opening of the central hole 18 of the resin intake manifold 7A. Here, the central hole 18 and the cylindrical inner sealing surface 28 are formed. Are approximately the same diameter. An annular groove is formed in the end face of the flange 10 of the intake manifold 7A near the inner cylindrical sealing surface 28.
An elastic seal member 40 is mounted in the annular groove 19, and a part of the elastic seal member 40 protrudes from the end face of the flange 10. One side of the flange 10 is the second embodiment.
2A (see FIG. 2A (c)), and the other side is narrow. Two insertion holes 31 are formed in a wide portion on one side of the flange 10.
The threaded ring bracket 11 is mounted in the insertion hole 31, and the position of the threaded ring bracket 11 is the same as the position of the threaded ring bracket 11 in FIG. 2A (d).

The flange 10 of the intake manifold 7A
A hook section 30 having a U-shaped cross section is formed on the other side of
As in the second embodiment of the hook portion 30 (see FIG. 2A (e)), the width of the hook portion 30 is the same as the width of the engaging flange 29. An engagement groove 34 is formed on the inner surface of the hook portion 30, and the engagement groove 34 extends over the entire width of the hook portion 30.
The lower surface of the engagement groove 34 is located on the same plane as the surface of the flange 10 of the intake manifold 7A. The thickness of the hook portion 30 is thin and the rigidity is smaller than that of other portions. In addition, a sled exists on the surface of the flange 10 and the like of the intake manifold 7A and is inclined. Further, without forming the cylindrical inner sealing surface 28 on the intake manifold 7A,
The throttle body 1 made of resin may be attached to the intake manifold 7A having the central hole 18 having the same inner diameter as the inner sealing surface 28 of the cylinder.

FIG. 3B (a) shows a throttle body 1 made of resin.
Shows a stage in the process of assembling into the intake manifold 7A made of resin. The mounting flange 2 of the resin throttle body 1 is brought close to the flange 10 of the intake manifold 7A, and the engagement flange 29 of the resin throttle body 1 is engaged.
Into the engagement groove 34 of the hook portion 30 of the intake manifold 7A.
To be engaged. Next, the bore 3 of the throttle body 1 made of resin and the sealing surface 28 inside the cylinder of the intake manifold 7A.
Are positioned on the same axis, and the ring-shaped metal fitting 4 for tightening the bolt of the mounting flange 2 and the ring-shaped metal fitting 11 of the flange 10 are arranged at opposing positions. In this state, on the other side of the throttle body 1 made of resin and the intake manifold 7A, the engaging flange 29 and the hook portion 30 are engaged with each other, so that the mounting flange 2 and the flange 10 come into contact with each other. Compressed. On the other hand, at one side of the resin throttle body 1 and the intake manifold 7A, the mounting flange 2 is attached to the elastic sealing member 40 by the presence of the warp of the mounting flange 2 and the flange 10 and the elasticity of the elastic sealing member 40.
Is in a floating state in contact with the upper end of the flange 10 and away from the flange 10.

Next, the two bolts 8 inserted into the bolting ring fittings 4 of the mounting flange 2 are screwed into the bolt holes of the two threaded ring fittings 11 of the flange 10, respectively, as shown in FIG. 3B. The state shown in (b) is reached and the assembly is completed. At this time,
The upper surface of the engaging flange 29 is supported on the upper surface of the engaging groove 34 of the hook portion 30, one side of the mounting flange 2 is fastened to one side of the intake manifold 7 </ b> A, and the lower side of the bolt tightening ring 4. Almost the entire end face is intake manifold 7
A is in contact with the upper surface of the threaded ring fitting 11 of FIG. The mounting flange 2 and the flange 10 have a warp, and the fastening flange 29 and the hook portion having low rigidity are tightened by the bolt 8.
30 is bent, and the other side of the mounting flange 2 is slightly lifted. Deflection (deformation) of the engagement flange 29 and the hook portion 30
As a result, the mounting flange 2 is
, Thereby preventing deformation (distortion) of the bore 3 and the valve seal surface of the resin throttle body 1. The space between the mounting flange 2 and the flange 10 is sealed by an elastic sealing member 40. In the third embodiment, in addition to the fastening with the bolt 8, the engagement flange is used.
Since the engagement between the hook 29 and the hook portion 30 is performed, the connection between the throttle body 1 made of resin and the intake manifold 7A becomes strong, and an appropriate assembled state is maintained even when an external force acts.

In the second and third embodiments, the engagement flanges 29 and 29A are formed on the resin throttle body 1 and the hook portions 30 are formed on the intake manifold 7A. The engagement flanges 29, 29A may be formed on the intake manifold 7A. In the second embodiment, the engagement flange is used.
Although the rigidity of 29 and 29A is made smaller than the rigidity of the other part, the rigidity of one or both of the engagement flanges 29 and 29A and the hook part 30 may be made smaller than the rigidity of the other part. In the third embodiment, the rigidity of both the engagement flange 29 and the hook portion 30 is smaller than the rigidity of the other portion. However, the rigidity of one of the engagement flange 29 and the hook portion 30 is smaller than the rigidity of the other portion. It may be smaller. Although the intake manifold 7A is entirely made of resin in the above-described second and partially modified examples and the third embodiment, the intake manifold 7 made of aluminum may be employed. . In the first to third embodiments,
The flanges 10 of the intake manifolds 7 and 7A are provided with the bolt holes 21 or the ring-shaped metal fittings 11 with screws. However, an insertion hole may be formed in the flange 10, and the mounting flange 2 and the flange 10 may be connected by bolts and nuts. .

[0030]

According to the resin throttle body of the first aspect of the present invention, an insertion hole is formed in a wide portion of the mounting flange on one side of the resin throttle body, and the outer peripheral annular shape of the cylindrical projection below the mounting flange. An elastic seal is installed in the groove. The resin throttle body is assembled to the intake manifold, the cylindrical protrusion of the resin throttle body is inserted into a central hole of the intake manifold, and a bolt is inserted into the insertion hole to connect the resin throttle body to the intake manifold. Although the cylindrical projection is inclined because the mounting flange of the resin throttle body has a warp, the seal between the outer surface of the cylindrical projection and the surface of the central hole is maintained by the elastic seal. Since the cylindrical projection is maintained in the inclined state, deformation of the bore of the resin throttle body and the valve seal surface can be avoided, and the accuracy of the air flow rate of the throttle valve can be ensured.

In the connecting device according to claims 2 and 3 of the present invention,
Insert the cylindrical projection of the throttle body made of resin into the seal surface or center hole in the cylinder of the intake manifold, and insert the bolt into the insertion hole formed in the wide part of the mounting flange,
A bolt is screwed into a bolt hole or the like formed in the wide portion of the flange of the intake manifold, and the resin throttle body is connected to the intake manifold. Claim 1
As in the case (1), deformation of the bore of the resin throttle body and the valve seal surface can be avoided, and the accuracy of the air flow rate of the throttle valve can be ensured. Claim 4 of the present invention
In the connection device of (5) and (5), in addition to the connection by the bolts in claims (2) and (3), the engagement by the engagement flange and the hook portion is added, so that the connection between the resin throttle body and the intake manifold becomes strong, and the external force is reduced. Even if it works, an appropriate assembly state is maintained. In the connecting device according to the sixth and seventh aspects of the present invention, the space between the mounting flange and the flange is sealed by the elastic sealing member, and the mounting flange and the flange are fastened by bolts only on one side and engaged on the other side. The engagement flange and the hook are engaged with each other, and the rigidity of one or both of the engagement flange and the hook is smaller than the rigidity of the other part. When one side of the mounting flange and one side of the flange are tightened by the bolt, one or both of the rigid and small engaging flange and the hook are bent, and the other side of the mounting flange and the other side of the flange are slightly reduced. Therefore, deformation of the bore of the resin throttle body and the valve seal surface can be avoided, and the accuracy of the air flow rate of the throttle valve can be ensured.

[Brief description of the drawings]

FIG. 1A shows a state before assembling of a first embodiment of a resin throttle body and a coupling device according to the present invention, and FIG. 1A (a).
FIG. 1A is a top view of a resin throttle body, and FIG. 1A (b) is a longitudinal sectional front view of a resin throttle body and an aluminum intake manifold.

FIG. 1B (a) is a longitudinal sectional front view showing a first assembled state of the embodiment, FIG. 1B (b) is a longitudinal sectional front view when an intake manifold is made of resin, and FIG. 1B (c) is FIG. 5 is a longitudinal sectional front view showing an assembled state when the first intake manifold according to the embodiment is changed to resin.

FIG. 2A shows the resin throttle body and the coupling device according to the second embodiment of the present invention before the second assembly, and FIG. 2A (a)
2A (b) is a longitudinal sectional front view of the resin throttle body, FIG. 2A (c) is a top view of the resin intake manifold, and FIG. 2A (d) is FIG. 2A.
FIG. 2C is a cross-sectional view taken along the line AA, and FIG.

FIG. 2B (a) is a longitudinal sectional front view showing a second assembled state of the embodiment, and FIG. 2B (b) is a resin throttle body in which the position of the engaging flange is changed in the second embodiment. FIG. 2B (c) is a vertical sectional front view of the resin throttle body.

2C (a) is a top view of the intake manifold in which the shape and position of the hook portion are changed in the second embodiment, FIG. 2C (b) is a sectional view taken along the line BB of FIG. 2C (a), FIG. 2C (c) is a side view of the intake manifold, and FIG.
C (d) is a longitudinal sectional front view showing the assembled state.

FIG. 3A shows a state before assembling according to a third embodiment of the resin throttle body and the coupling device of the present invention, and FIG. 3A (a).
3A is a top view of the resin throttle body, FIG. 3A (b) is a longitudinal sectional front view of the resin throttle body, and FIG. 3A (c) is a longitudinal sectional front view of the resin intake manifold.

3B (a) is a longitudinal sectional front view showing a state in the middle of the third embodiment of the embodiment, and FIG. 3B (b) is a longitudinal sectional front view showing a state of the completion of the third embodiment of the present invention; It is.

FIG. 4A shows a state before assembly is completed when a conventional resin throttle body and an aluminum intake manifold are used, and FIG. 4A (a) is a longitudinal sectional front view showing the state before assembly; (b) is a longitudinal front view showing the state in the middle of assembly.

FIG. 4B (a) is a longitudinal sectional front view of a state where a conventional resin throttle body and an aluminum intake manifold are assembled, and FIGS. 4B (b) and 4B (c) are conventional resin throttles, respectively. It is a top view of a body.

FIG. 5 shows a case where a conventional resin throttle body is assembled to a resin intake manifold. FIG. 5 (a) is a longitudinal sectional front view showing a state before assembly, and FIG. 5 (c) is a longitudinal sectional front view after the assembly is completed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin throttle body 2 Mounting flange 4 Ring metal fitting for bolt tightening 5 Insertion hole 7, 7A Intake manifold 8 Bolt 10 Flange 22 Cylindrical projection 23 Outer peripheral annular groove 24 Elastic seal 28 Sealing surface inside cylinder

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI F16L 23/036 F16L 23/02 C

Claims (7)

[Claims] 1. A resin throttle body in which a bolt fastening ring is mounted in an insertion hole of a mounting flange.
The mounting flange is formed so that only one side portion of the resin throttle body is wide, the insertion hole is formed in a wide portion of the mounting flange, a cylindrical projection is formed below the mounting flange, and an outer peripheral annular groove of the cylindrical projection is formed. Resin throttle body with elastic seal attached to it. 2. A coupling device in which a mounting flange of a resin throttle body and a flange of an intake manifold are arranged to face each other, and the mounting flange is fastened to the flange by a bolt inserted into an insertion hole of the mounting flange. A cylindrical projection is formed below, an elastic seal is attached to an outer peripheral annular groove of the cylindrical projection, and a cylindrical inner sealing surface or a central hole is formed in the intake manifold in which the cylindrical projection can be inserted in an inclined state. A connection device characterized in that a space between the outer surface and the inner cylindrical sealing surface or the center hole is always sealed by an elastic seal. 3. The mounting flange and the flange are formed so that only one side is wide, the insertion hole is formed in a wide portion of the mounting flange, and a bolt hole or an insertion hole is formed in a wide portion of the flange. The coupling device according to claim 2. 4. An engagement flange is provided on the other side of the resin throttle body or the intake manifold, and a hook portion having a U-shaped cross section is formed on the other side of the flange of the intake manifold or the resin throttle body. 4. The coupling device according to claim 2, wherein the engagement flange is engaged with the hook by rotating the resin throttle body and the intake manifold relative to each other. 5. The rigidity of one or both of the engagement flange and the hook portion is smaller than the rigidity of the other portion.
3. The coupling device according to claim 1. 6. A coupling device in which a mounting flange of a resin throttle body and a flange of an intake manifold are arranged to face each other, and the mounting flange is fastened to the flange by a bolt inserted into an insertion hole of the mounting flange. The flange and the flange are sealed by an elastic sealing member, the mounting flange and the flange are bolted only on one side, and are engaged with the engaging flange and the hook on the other side, and the engaging flange and the hook are Wherein the rigidity of one or both of them is made smaller than the rigidity of the other part. 7. The mounting flange and the flange are formed so that only one side is wide, an engagement flange is provided on the other side of the resin throttle body or the intake manifold, and the other side of the intake manifold or the resin throttle body is provided. The connecting device according to claim 6, wherein a hook portion having a U-shaped cross section is formed in the portion.