JP3894713B2 - Manufacturing method for vehicle intake manifold - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention includes a plurality of branch pipes having a shape in which a projection onto a vertical plane is bent at approximately 90 degrees, one end of which is commonly connected to the surge tank and arranged in parallel in the horizontal direction, and The present invention relates to a method for manufacturing a vehicle intake manifold having an engine mounting flange that is commonly provided at the other end, and in particular, a method for manufacturing a vehicle intake manifold by welding a pair of joint members made of synthetic resin to each other. Regarding improvement.
[0002]
[Prior art]
Conventionally, such a vehicle intake manifold is already known, for example, from WO 97/15755.
[0003]
[Problems to be solved by the invention]
By the way, the joint part of the vehicle intake manifold constituted by welding a plurality of joint members made of synthetic resin must have sufficient joint strength to withstand internal pressure, and among the joint parts, it is used for engine mounting. In the vicinity of the flange, it is necessary to maintain sufficient joint strength and rigidity in view of the fact that a fuel rail or the like is disposed near the flange.
[0004]
On the other hand, when welding a joining member made of a synthetic resin, it has been widely practiced to set the welding allowance almost uniformly over the entire area of the joining line. It is already known from, for example, EP-0568560B1 and Japanese Patent Application Laid-Open No. 5-177712, that not only a vertical plane but also an inclined portion or a curved surface portion can shorten the welding time and improve the efficiency. It has been.
[0005]
Therefore, the projection onto the vertical plane has a shape bent at approximately 90 degrees, and one end is commonly connected to the surge tank and is arranged in parallel in the horizontal direction, and the other end of each branch pipe A first manifold member made of synthetic resin, which is provided with an engine mounting flange that is provided in common with the engine mounting flange, and that includes a part of each branch pipe that is integrally provided with the engine mounting flange; The second connecting member made of synthetic resin constituting the remaining portion of the branch pipe is mutually connected by a joint line that has an inclined portion arranged in a substantially half circumference of each branch pipe in the vicinity of the engine mounting flange and continues in a loop shape. As a result, it was found that the bonding strength of the inclined portion in the bonding line was lower than that of other parts, and the necessary bonding strength could not be obtained.
[0006]
This seems to be due to the fact that the inclined portion of the joining line cannot receive an effective reinforcement backup during welding. That is, since the inclined portion is arranged in a substantially half circumference of the branch pipe while being inclined with respect to the pressurizing direction when the two joining members are pressurized to each other at the time of welding, it constitutes the entire inner circumference of the intake passage. In this way, the cylindrical portion provided in advance in the first joining member and a part of the inclined portion are arranged so as to overlap in the pressurizing direction during welding, and the first and second joining members are added to each other. This is because it is difficult to back up the portion corresponding to the inclined portion on the first joining member side when pressing.
[0007]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a method for manufacturing a vehicle intake manifold capable of preventing a decrease in joint strength in the vicinity of an engine mounting flange.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, the projection onto the vertical plane has a shape bent at about 90 degrees, and one end is commonly connected to the surge tank and is arranged in parallel in the horizontal direction. When manufacturing a vehicle intake manifold having a plurality of branch pipes and an engine mounting flange connected in common to the other ends of the branch pipes, the engine mounting flanges are integrally provided and A synthetic resin first joining member that constitutes a part of the branch pipe and a synthetic resin second joining member that constitutes the remaining part of each branch pipe are pressed against each other during welding. Of an intake manifold for a vehicle that has an inclined portion that is inclined with respect to the pressurizing direction at the time and is disposed substantially halfway around the other end of each branch pipe and is welded to each other through a joining line that is continuous in a loop shape In the method, the first joint A first mold on the member side, an insert mold supported by the first mold so as to be able to be inserted into and removed from the engine mounting flange side into the first bonding member, and a second mold on the second bonding member side 2 molds are prepared, and the insert mold is first joined to a position where the first joining member can be restrained between the inclined part and the second mold at least near the engine mounting flange. The first and second joining members, which are pressed between the first and second molds while being inserted into the member, are vibration welded along the joining line.
[0009]
According to the method of the first aspect of the present invention, when the first and second joining members are welded by pressurizing each other, at least in the portion near the engine mounting flange in the inclined portion of the joining line. 1 It is possible to back up the inner surface side of the joining member with an insert mold, and it becomes possible to press and apply the inclined part from the inside and outside sufficiently to weld and weld, and to reduce the joining strength of the inclined part. Can be prevented. In addition, the insert mold is supported by the first mold on the first bonding member side, and even if one of the first and second molds vibrates, it is between the first bonding member and the insert mold. No relative movement occurs, and reliable reinforcement backup by the insert mold of the inclined portion becomes possible.
[0010]
According to a second aspect of the invention, in addition to the configuration of the first aspect of the invention, the first joining member is inserted in the direction along the pressing direction when the insert mold is inserted into the first joining member. The insert mold is brought into close contact with the inner surface of the first member, and a gap is generated between the inner surface of the first joining member and the insert mold in the vibration direction which is a direction perpendicular to the pressing direction.
[0011]
According to the method of the invention described in claim 2, it is possible to roughly set the dimensional accuracy of the insert mold in the vibration direction perpendicular to the pressing direction, and for the first joining of the insert mold. Even during insertion / removal of the member, it is possible to avoid the occurrence of galling or wear of the first joining member as much as possible, and to suppress the power required for insertion / removal of the insert mold.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples of the present invention shown in the accompanying drawings.
[0013]
1 to 10 show a first embodiment of the present invention. FIG. 1 is a perspective view of an intake passage structure and a throttle body, FIG. 2 is a side view of the intake passage structure, and FIG. 3 is a cross-sectional view taken along line 4-4 of FIG. 3, FIG. 5 is a cross-sectional view of the second joining member viewed from the direction along line 5-5 of FIG. 2, and FIG. FIG. 7 is an enlarged sectional view taken along line -6, where FIG. 7A shows a state before welding, FIG. 7B shows a state after welding, and FIG. 7 shows an enlarged sectional view taken along line 7-7 in FIG. FIG. 8A is a diagram showing a state before welding, FIG. 8B is a diagram showing a state after welding, and FIG. 8 is a partial vertical sectional view of a mold apparatus for intake manifold, which is shown in FIG. FIG. 9 is a sectional view taken along line 9-9 of FIG. 8, and FIG. 10 is a view showing a manufacturing state of the surge tank.
[0014]
First, in FIGS. 1 to 3, the throttle body 11 is attached to an intake passage structure 14 integrally having a surge tank 12 and an intake manifold 13 that connects between a 4-cylinder engine (not shown) and the surge tank 12. The intake passage structure 14 is configured by vibration welding the first, second and third joining members 15, 16 and 17 made of synthetic resin.
[0015]
The throttle body 11 has a cylindrical shape that extends vertically and is coupled to the center of the upper surface of the first joining member 15. A butterfly throttle valve (not shown) that controls the amount of air flow is provided in the throttle body 11. 11 is fixed to a valve shaft 18 that is rotatably supported by a throttle shaft 11, and a throttle drum 19 is attached to a protruding end portion of the valve shaft 18 from the throttle body 11.
[0016]
Referring to FIGS. 4 and 5 together, a connecting cylinder 15a for connecting the throttle body 11 is integrally provided at the center of the first joining member 15, and the surge tank 12 includes The intake chamber 20 connected to the connecting cylinder portion 15a is formed by the second and third joining members 15, 16, and 17.
[0017]
The intake manifold 13 is arranged in parallel in the horizontal direction so that, for example, a pair is arranged on both sides of the throttle body 11 and the connecting cylinder portion 15a, and a plurality of, for example, four branches, one end of which is commonly connected to the surge tank 12. The other ends of the pipes 21A, 21B, 21C, and 21D are connected in common and integrally to an engine mounting flange 22 for mounting on the engine.
[0018]
The branch pipe 21 </ b> A has a first straight pipe portion 23 that is connected to the surge tank 12 at one end and rises upward, and bends within a range of approximately 90 degrees in the vertical plane and is connected to the other end of the first straight pipe portion 23. A bent pipe portion 24 having one end connected to it and a second straight pipe portion 25 having one end connected to the other end of the bent pipe portion 24 and extending substantially horizontally, and a branch pipe 21A to a vertical plane. This projection is bent at approximately 90 degrees. The other branch pipes 21B, 21C, and 21D also have the same basic configuration as the branch pipe 21A, and the projections of the branch pipes 21B to 21D on the vertical plane are also bent at about 90 degrees.
[0019]
Intake pipes 26A, 26B, 26C, and 26D are formed in the branch pipes 21A to 21D, respectively, and the air introduced from the throttle body 11 into the intake passage structure 14 is indicated by broken line arrows in FIG. Then, after flowing downward in the surge tank 12, it is reversed upward and guided to the intake passages 26A to 26D. The air introduced into each of the intake passages 26A to 26D circulates upward and then circulates substantially horizontally toward the engine side by changing the direction of circulation by approximately 90 degrees.
[0020]
On the other hand, the engine mounting flange 22 has passage holes 27A, 27B, 27C, and 27D that allow the intake passages 26A to 26D to communicate with the intake ports (not shown) of the engine individually corresponding to the intake passages 26A to 26D. Provided. As shown in FIG. 1, the engine mounting flange 22 is provided with fuel injection valves 28, 28... For supplying fuel to the intake ports of the engine, and the fuel rails are attached to the fuel injection valves 28, 28. 29 are connected in common, but on the upper part of the engine mounting flange 22, there are mounting portions 30, 30 ... for mounting the fuel injection valves 28, 28 ... and mounting portions for mounting the fuel rail 29. 31 (see FIG. 2) are integrally provided.
[0021]
Such an intake manifold 13 is configured by welding the first and second joining members 15 and 16 together with a joining line 32 that is continuous in a loop shape, and the first joining member 15 includes: The engine mounting flange 22 is integrally provided and formed so as to constitute a part of the upper part of each branch pipe 21A to 21D and the surge tank 12, and the second joining member 16 includes a lower part of each branch pipe 21A to 21D and The main part of surge tank 12 is formed.
[0022]
In FIG. 6A, a joint flange 33 along the joint line 32 is integrally formed on the entire periphery of the lower end of the first joint member 15, and the tip of the joint flange 33 has a distal end. A protrusion 34 having a flat joining surface 34a is integrally provided so as to protrude toward the second joining member 16 side.
[0023]
On the other hand, a joint flange 35 that is opposed to the joint flange 33 of the first joint member 16 is integrally formed on the entire periphery of the upper end of the second joint member 16. The welding protrusion 36 corresponding to the bonding surface 34a of the protrusion 34 is integrally provided on the portion so as to protrude toward the second bonding member 15, and the width of the welding protrusion 35 is larger than that of the protrusion. It is set narrowly. In addition, on the entire circumference of the joint flange 35 of the second joining member 16, there are integrally provided regulating wall portions 37 and 38 that project toward the first joining member 15 so as to sandwich the welding projection 36 from the inside to the outside. It is done.
[0024]
When the first and second joining members 15 and 16 are welded to each other, for example, the first joining member 15 is placed on the second joining member 16 side in order to pressurize the first and second joining members 15 and 16 to each other. One of the first and second joining members 15, 16 is carried out in a state where the tip of the welding projection 36 is pressed against the joining surface 34 a of the protrusion 34 by pressurizing in the pressurizing direction 39. In the example, the first joining member 15 is vibrated at high speed. Accordingly, the frictional heat generated between the tip of the welding projection 36 and the joining surface 34a causes the tip of the welding projection 36 to be vibration welded to the protrusion 34 as shown in FIG. The entire circumferences of the first and second joining members 15 and 16 are joined along a joining line 32 that is continuous in a loop.
[0025]
Thus, both the regulating wall portions 37 and 38 of the second joining member 16 are welded to the joining members 15 and 16 to a position where the tips are close to and opposed to the joining flange portion 33 of the first joining member 15. While serving as a guide for stopping the vibration welding process in a state where the joining has progressed, a flash generated by the vibration welding of the tip of the welding projection 36 to the joining surface 34a is used for the first and second joining. It functions to prevent the members 15 and 16 from protruding outside, that is, the intake manifold 13.
[0026]
By the way, the joining line 32 of the first and second joining members 15, 16 is inclined by an angle α with respect to the pressurizing direction 39 in the vicinity of the engine mounting flange 22, and is substantially half the circumference of each branch pipe 21 </ b> A to 21 </ b> D. The inclined portions 32a are arranged in a loop and have the engine attachment flange 22 formed integrally with the first joining member 15. Therefore, the inclined portions 32a are provided with the engine attachment flange. It is inclined so as to become a lower position toward 22.
[0027]
Even in the inclined portion 32a, as shown in FIG. 7A, the first joining member 15 has a protrusion 34 'connected to the protrusion 34 protruding to the second joining member 16 side. In addition, the second joining member 16 has a welding projection 36 'connected to the welding projection 36 and a regulation wall portion 37'38' connected to the regulation wall portions 37, 38 in the first joining. As shown in FIG. 7B, the tip of the welding projection 36 'is vibration welded to the protrusion 34'.
[0028]
By the way, the joint portion along the joint line 32 of the first and second joining members 15 and 16 constituting the intake manifold 13 needs to have sufficient joint strength to withstand internal pressure, and among the joint portions, In the vicinity of the engine mounting flange 22, it is necessary to maintain sufficient joint strength and rigidity in view of the fact that the fuel rail 29 and the like are disposed near the flange 22. In a state where the portion corresponding to the inclined portions 32a is not reinforced from the inner surface side, the bonding strength of the inclined portions 32a in the bonding line 32 is lower than in other portions, and the necessary bonding strength cannot be obtained. That is, the inclined portions 32a are inclined with respect to the pressurizing direction 39 when both the joining members 15 and 16 are pressurized to each other at the time of welding, and are disposed on the substantially half circumference of the branch pipes 21. The cylindrical portion 15b provided in advance in the first joining member 15 so as to constitute the entire inner circumference of the passages 26A to 26D and a part of the inclined portion 32a are in a pressurizing direction 39 at the time of welding. When the first and second joining members 15 and 16 are pressed against each other, the portion corresponding to the inclined portion 32a on the first joining member 15 side is not reinforced from the inner surface side. Then, the inclined portions 32a are bent, and it becomes difficult to sufficiently bond and weld them.
[0029]
Therefore, when the intake manifold 13 is manufactured, as shown in FIGS. 8 and 9, the first mold 40 on the first joining member 15 side, the second mold 41 on the second joining member 16 side, and the first Four insert molds 42A to 42D supported by the mold 40 are prepared.
[0030]
The support stay 44 fixed to the first mold 40 has cylinders 45 individually corresponding to the passage holes 27A to 27D of the engine mounting flange 22 in the first joining member 15, and the passage holes 27A to 27A. The insert molds 42 </ b> A to 42 </ b> D are respectively fixed to the tip ends of piston rods 45 a provided in the respective cylinders 45. That is, each insert mold 42A to 42D is supported by the first mold 40 via the cylinders 45.
[0031]
Moreover, the insert molds 42A to 42D can be inserted into and removed from the first attachment member 15 from the engine mounting flange 22 side by the expansion and contraction operation of the cylinders 45. 42A to 42D are inserted into the first joining member 15 at least up to the portion near the engine mounting flange 22 in the inclined portion 32a in the joining line 32. In this embodiment, as shown in FIG. The insert molds 42A to 42D are inserted into the cylindrical portion 15b provided on the engine attachment flange 22 side of the first joining member 15.
[0032]
By the way, when the first and second joining members 15 and 16 are welded, the first mold 40 vibrates at high speed in a vibration direction perpendicular to the pressurizing direction 39 as indicated by an arrow 46 in FIG. However, each of the insert molds 42A to 42D is in close contact with the inner surface of the first joining member 15 in the direction along the pressurizing direction 39 when inserted into the first joining member 15, but is first in the vibration direction 46. It is formed so as to generate gaps 43, 43... With the inner surface of the joining member 15.
[0033]
When the first and second joining members 15 and 16 are welded and joined by the first die 40, the second die 41, and the insert dies 42A to 42D, the insert die is moved to a position corresponding to the cylindrical portion 15b. 42A to 42D are inserted into the first joining member 15 so that the first joining member 15 and the second mold 41 are at least at a portion near the engine mounting flange 22 in the inclined portion 32a of the joining line 32. The first mold 40 is vibrated at high speed in the vibration direction 46 in a state in which the first and second bonding members 15 and 16 are sandwiched and pressed between the first and second molds 40 and 41. By doing so, the first and second joining members 15 and 16 are vibration welded along the joining line 32.
[0034]
By the way, in order to prevent the joint strength of the inclined portion 32a in the joining line 32 of the first and second joining members 15 and 16 from being lowered, the above-described insert molds 42A to 42D are used at the time of welding joining. In order to further improve the bonding strength of the inclined portion 32a, the following measures may be taken.
[0035]
That is, the welding in the direction orthogonal to the pressurizing direction 39 of the welding projection 36 ′ corresponding to the inclined portion 32 a... Of the welding margin set before welding by the welding projections 36, 36 ′ of the second bonding member 16. The allowance W ′ may be set larger than the welding allowance W in the direction perpendicular to the pressurizing direction 39 of the welding projection 36 at the remaining portion excluding the inclined portions 32a of the joining line 32. If it carries out like this, when the 1st and 2nd joining members 15 and 16 are mutually pressurized and welded, the welding amount in the part corresponding to the inclined part 32a ... of the 1st and 2nd joining members 15 and 16 ... However, it becomes larger than the other part by the difference (W'-W) of the welding allowance along the direction orthogonal to the pressing direction 39, and the joining strength of the inclined portion 32a is made larger than the other part. Can do.
[0036]
Of the welding allowances set before welding by the welding projections 36, 36 'of the second bonding member 16, the welding allowance L' along the pressing direction 39 of the welding projection 36 'corresponding to the inclined portion 32a ... However, it may be set larger than the welding allowance L along the pressurizing direction 39 of the welding projection 36 at the remaining portion excluding the inclined portions 32a of the joining line 32. In this way, when the first and second joining members 15 and 16 are pressurized and welded to each other, the portions corresponding to the inclined portions 32a of the first and second joining members 15 and 16 are the other parts. Contact will be made prior to the site. Accordingly, the inclined portions 32a are welded earlier or more by the difference of the welding allowance along the pressurizing direction 39 (L'-L), and when the predetermined amount of welding at the other part is completed, The welding amount of the inclined portions 32a is equal to or larger than the welding amount of the other part. As a result, it is possible to further improve the bonding strength of the inclined portions 32a ... together with the effect of improving the strength due to the difference in welding margin (W'-W) in the direction orthogonal to the pressing direction 39.
[0037]
Further, the intake manifold 13 formed by mutual joining of the first and second joining members 15 and 16 and the third joining member 17 are, as shown in FIG. 10, a third die 47 on the intake manifold 13 side. And the fourth mold 48 on the third bonding member 17 side, the third manifold 47 is vibrated and welded while the intake manifold 13 and the third bonding member 17 are sandwiched and pressurized. Thus, the manufacture of the intake passage structure 14 is completed.
[0038]
Next, the operation of the first embodiment will be described. When the intake manifold 13 is manufactured by joining and welding the first and second joining members 15 and 16, the first gold on the first joining member 15 side is described. A mold 40, insert molds 42 </ b> A to 42 </ b> D that can be inserted and removed from the engine attachment flange 22 side into the first joining member 15, and a second mold 41 on the second joining member 16 side are prepared. The first joining member 15 is connected to the second mold 41 at least at a portion near the engine mounting flange 22 among the inclined portions 32a in the joining line 32 of the first and second joining members 15 and 16. The first and second joining molds 42A to 42D are inserted into the first joining member 15 and pressed between the first and second molds 40 and 41 until they can be constrained. Members 15 and 16 To vibration welding along a joining line 32.
[0039]
Therefore, in the inclined portion 32a of the joining line 32, the inner surface side of the first joining member 15 can be backed up by the insert molds 42A to 42D at least at the portion near the engine mounting flange 22, and the inclined portion 32a. It is possible to sufficiently bond and weld the inside and the outside by applying pressure from the inside and outside, and to prevent a reduction in the bonding strength of the inclined portions 32a.
[0040]
Moreover, the insert molds 42A to 42D are supported by the first mold 40, and even if the first mold 40 on the first bonding member 15 side vibrates, the first bonding member 15 and the insert mold are used. Relative movement does not occur between the molds 42A to 42D, and reliable reinforcement backup by the insert molds 42A to 42D of the inclined portion 32a is possible.
[0041]
Further, when the insert molds 42A to 42D are inserted into the first joining member 15, in the direction along the pressurizing direction 39, the insert molds 42A to 42D are brought into close contact with the inner surface of the first joining member 15, and the pressurizing direction. In the vibration direction 46, which is a direction perpendicular to 39, the gaps 43, 43... Are formed between the inner surface of the first joining member 15 and the insert dies 42 </ b> A to 42 </ b> D, and therefore the insert dies 42 </ b> A to 42 </ b> D in the vibration direction 46. It is possible to set the dimensional accuracy roughly, and avoid the occurrence of galling and wear of the first joining member 15 as much as possible even when the insert molds 42A to 42D are inserted into and removed from the first joining member 15. The power required to insert / remove the insert molds 42A to 42D can be kept small, and each cylinder 45 can be downsized.
[0042]
FIG. 11 shows a second embodiment of the present invention, and parts corresponding to the first embodiment are given the same reference numerals.
[0043]
The intake manifold is integrally provided with an engine mounting flange 22 and is formed with a first joining member 15 ′ formed so as to constitute a lower part of each branch pipe 21 </ b> A to 21 </ b> D (see FIG. 1) and a main part of the surge tank 12. The second joining member 16 'constituting a part of the upper part of each of the branch pipes 21A to 21D is welded and joined to each other along the joining line 32'. The joining line 32 ′ has an inclined portion 32 a ′ inclined by an angle α with respect to the pressurizing direction 39 in the vicinity of the engine mounting flange 22, and is continuous in a loop shape. Since the engine mounting flange 22 is integrally provided on the member 15 ′, the inclined portions 32 a ′ are inclined so as to be in an upper position toward the engine mounting flange 22.
[0044]
When the intake manifold is manufactured, the first die 40 'on the first joining member 15' side, the second die 41 'on the second joining member 16' side, and the support stay 44 are attached to the first die 40 '. 'And four insert molds 42A to 42D supported via the cylinders 45 are prepared.
[0045]
When the first and second joining members 15 ′ and 16 ′ are welded and joined by the first mold 40 ′, the second mold 41 ′, and the insert dies 42 </ b> A to 42 </ b> D, the first joining member 15 ′ is The insert molds 42A to 42D are inserted into the first joining member 15 'up to the positions corresponding to the cylindrical portions 15b' provided, so that at least the engine mounting flange 22 of the inclined parts 32a 'in the joining line 32'. The first and second joining members 15 'can be constrained between the first and second molds 40' and 41 'while the first joining member 15' can be restrained between the second mold 41 'and the first joining member 15'. , 16 'is pressed and the second mold 41' is vibrated at high speed, whereby the first and second joining members 15 ', 16' are vibration welded along the joining line 32 '.
[0046]
The same effects as those of the first embodiment can be obtained by the second embodiment.
[0047]
Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.
[0048]
For example, in each of the above-described embodiments, the insert molds 42A to 42D are inserted up to the positions corresponding to the cylindrical portions 15b ..., 15b '... included in the first joining members 15, 15'. The lengths of the insert molds 42A to 42D may be set so as to be inserted between the joining members 15, 16; 15 ', 16'. In this case, the second joining member 16 is caused by vibration during welding. , 16 ′ and the insert molds 42 </ b> A to 42 </ b> D are set such that a clearance larger than the amplitude of vibration is set between the tips of the insert molds 42 </ b> A to 42 </ b> D and the second joining members 16 and 16 ′. What should I do?
[0049]
【The invention's effect】
As described above, according to the first aspect of the present invention, the inner surface of the first joining member is backed up by the insert mold at least at the portion near the engine mounting flange in the inclined portion of the joining line. Further, since the relative strength does not occur between the first joining member and the insert mold, reliable reinforcement backup by the insert mold of the inclined portion is possible.
[0050]
According to the second aspect of the present invention, it is possible to roughly set the dimensional accuracy of the insert mold in the vibration direction perpendicular to the pressing direction, and it is possible to cause galling and wear of the first joining member. By avoiding as much as possible, it is possible to keep the power required for inserting and removing the insert mold small.
[Brief description of the drawings]
FIG. 1 is a perspective view of an intake passage structure and a throttle body in a first embodiment.
FIG. 2 is a side view of the intake passage structure.
FIG. 3 is a view taken in the direction of arrow 3 in FIG. 2;
4 is a cross-sectional view taken along line 4-4 of FIG.
5 is a cross-sectional view of the second joining member as seen from the direction along line 5-5 in FIG.
6 is an enlarged cross-sectional view taken along line 6-6 of FIG. 2, wherein (a) is a diagram showing a state before welding, and (b) is a diagram showing a state after welding.
7 is an enlarged cross-sectional view taken along line 7-7 in FIG. 3, where (a) is a diagram showing a state before welding, and (b) is a diagram showing a state after welding.
8 is a partial longitudinal sectional view of the intake manifold mold apparatus, and is an enlarged sectional view taken along line 8-8 of FIG.
9 is a cross-sectional view taken along line 9-9 of FIG.
FIG. 10 is a diagram showing a manufacturing state of the surge tank.
FIG. 11 is a cross-sectional view corresponding to FIG. 8 of the second embodiment.
[Explanation of symbols]
12 ... Surge tank
13 ... Intake manifold
15, 15 '... first joining member
16, 16 '... second joining member
21A, 21B, 21C, 21D ... branch pipe
22 ... Engine mounting flange
39 ... Pressure direction
32, 32 '... Joining line
32a, 32a '... inclined part
40, 40 '... first mold
41, 41 '... second mold
42A, 42B, 42C, 42D ... Insert mold
43 ... Gap
46 ... Vibration direction

Claims (2)

The projection onto the vertical plane has a shape bent at approximately 90 degrees, and one end is commonly connected to the surge tank (12) and is arranged in parallel in the horizontal direction (21A, 21B, 21C, 21D) and an engine mounting flange (22) provided in common with the other ends of the branch pipes (21A to 21D), the above-described engine mounting flange (22) are integrally formed, and the first joining member (15, 15 ') made of synthetic resin constituting a part of each of the branch pipes (21A to 21D), and the remaining part of each branch pipe (21A to 21D) The second bonding member (16, 16 ') made of synthetic resin and the two bonding members (15, 16; 15', 16 ') are pressed in the direction in which they are pressed against each other during welding (39 ) Each branch pipe inclined to 21A to 21D) have an inclined portion (32a, 32a ') disposed on the other half side of the other end side, and are welded to each other by a joining line (32, 32') connected in a loop shape. In the manufacturing method, the first die (40, 40 ') on the first joining member (15, 15') side and the first joining member (15, 15 'from the engine mounting flange (22) side). ) And insert molds (42A, 42B, 42C, 42D) supported by the first mold (40, 40 ') to be able to be inserted into and removed from the inside, and the second joining member (16, 16') side A second mold (41, 41 ') is prepared, and the first joining member (15, 15') is at least a portion of the inclined portion (32a, 32a ') near the engine mounting flange (22). Is restrained between the second mold (41, 41 ') The insert molds (42A to 42D) are inserted into the first joining members (15, 15 ') up to a position, and between the first and second molds (40, 41; 40', 41 '). An intake manifold for a vehicle, characterized in that the first and second joining members (15, 16; 15 ', 16') pressed by sandwiching them are vibration welded along the joining lines (32, 32 '). Production method. When the insert molds (42A to 42D) are inserted into the first joining members (15, 15 '), the inner surfaces of the first joining members (15, 15') in the direction along the pressing direction (39). While the insert molds (42A to 42D) are in close contact with each other, the inner surface of the first joining member (15, 15 ') and the insert mold in the vibration direction (46) perpendicular to the pressing direction (39). The method of manufacturing a vehicle intake manifold according to claim 1, wherein a gap (43) is generated between (42A to 42D).

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