JP2021162222A - Duct and manufacturing method of the same and duct manufacturing apparatus - Google Patents

Abstract

To provide a duct which enables easy assembly.SOLUTION: In a duct 10, an end edge of a first split body 14 made of a synthetic resin and an end edge of a second split body 16 made of a synthetic resin are butted and assembled to each other to define an airflow passage. The first split body 14 includes: an engagement part 26 protruding from its end edge to the second split body 16 side; and a correction recessed part 28 formed at a root part of the engagement part 26. The second split body 16 includes an engagement receiving part 30 in which the engagement part 26 of the first split body 14 is fitted.SELECTED DRAWING: Figure 4

Description

The present invention relates to a duct formed by assembling a plurality of separate bodies by claw fitting, a method for manufacturing the duct, and a manufacturing apparatus for manufacturing the duct.

As a duct, there is a duct in which the first member and the second member are combined by abutting the edges of each other to form a tubular shape in which an air flow passage is defined inside (see, for example, Patent Document 1). .. The first member is a resin molded product by injection molding, and a plurality of engaging claws are provided on the edge abutting the second member so as to be separated from each other in the extending direction of the edge. Further, the second member is a resin molded product by injection molding, and an engaging hole is provided at an end edge abutting against the first member corresponding to the plurality of engaging claws. Then, in the duct of Patent Document 1, the edge of the first member and the edge of the second member are butted against each other, and the engaging claw is inserted into the engaging hole to fit the engaging claw and the engaging hole. The combined structure allows the first member and the second member to be assembled.

Japanese Unexamined Patent Publication No. 2011-202508

As described above, since the first member and the second member are resin molded products, they may fall down so that the edges approach each other due to molding shrinkage or the like. In particular, since the engaging claws of the first member protrude from the edge, the influence of the positional deviation is large, and the positional deviation of the engaging claws makes it difficult to assemble the first member and the second member, resulting in higher manufacturing efficiency. It is causing deterioration.

The present invention has been proposed in view of the above-mentioned problems related to the prior art, and has been proposed to suitably solve these problems. It is an object of the present invention to provide a duct manufacturing method and a duct manufacturing apparatus capable of easily assembling the second body and the second body.

In order to overcome the above-mentioned problems and achieve the intended purpose, the duct according to the present invention is used.
A duct in which at least a part of the air flow passage is defined by the first and second divisions assembled by abutting the edges of each other.
The first and second parts are molded products of synthetic resin.
The first segment is
A locking portion provided so as to project from the edge of the first division toward the second division, and
A straightening recess formed at the base of the locking portion and opening to the side opposite to the protruding direction of the locking portion is provided.
When the locking portion is responsively provided on the edge of the second body and the edge of the first body is abutted against the edge of the second body, the second body is provided. It is a gist that the locking portion is provided with a locking receiving portion that catches on the locking portion and prevents the locking portion from coming off.

In order to overcome the above-mentioned problems and achieve the desired object, the method for manufacturing a duct according to the present invention is:
A method of manufacturing a duct in which at least a part of an air flow passage is defined by a first division and a second division assembled by abutting the edges of each other.
A locking portion provided so as to project from the edge toward the second body side, and a straightening recess formed at the root portion of the locking portion and open to the side opposite to the protruding direction of the locking portion. The first divided body to be provided is molded with a synthetic resin and provided.
The locking portion is responsively provided on the edge, and when the edge of the first segment and the edge of the second segment are abutted against each other, the locking portion is caught by the locking portion and the locking portion is engaged. The second part, which is provided with a locking receiving portion for preventing the removal of the above-mentioned body, is molded from a synthetic resin.
After inserting the straightening claw portion into the straightening recess and correcting the position of the locking portion, the first body is set in the first holding means.
The second body set in the second holding means and the first body set in the first holding means are relatively close to each other, and the locking portion is fitted into the locking receiving portion. The gist is to assemble the first and second divisions.

In order to overcome the above-mentioned problems and achieve the desired object, the duct manufacturing apparatus according to the present invention is used.
It is a duct manufacturing device configured by assembling the first and second parts made of synthetic resin with their edges abutting each other.
The straightening claw portion is formed at the root portion of the locking portion protruding from the edge of the first division and can be inserted into a straightening recess that opens to the side opposite to the protruding direction of the locking portion. A first holding means configured to be able to hold the first body in a state where the straightening claw portion is inserted into the recess and the position of the locking portion is corrected.
A second holding means configured to hold the second body, which is provided with a locking receiving portion capable of receiving the locking portion at an end edge, is provided.
It is a gist that the first holding means and the second holding means are configured to be relatively displaceable so as to fit the locking portion into the locking receiving portion.

According to the duct according to the present invention, it is possible to easily assemble the first body and the second body.
According to the method for manufacturing a duct according to the present invention, it is possible to easily assemble the first and second divisions.
According to the duct manufacturing apparatus according to the present invention, it is possible to easily assemble the first and second divisions.

It is a schematic perspective view which shows the duct which concerns on embodiment of this invention. It is the schematic perspective view which shows the duct of an Example disassembled. FIG. 1 is a cross-sectional view taken along the line AA of FIG. It is the B part enlarged view of FIG. (a) is a cross-sectional view corresponding to the position taken along the line CC in FIG. 4, (b) is a cross-sectional view of a main part showing the process of assembling the locking portion and the locking receiving portion, and (c) is a cross-sectional view. It is sectional drawing of the main part which shows the assembled state of a stop part and a locking receiving part. It is the schematic perspective view which shows the main part of the duct of the modification example. It is sectional drawing corresponding to the DD line position of FIG. It is sectional drawing corresponding to the position of line EE of FIG. It is sectional drawing corresponding to the position of the FF line of FIG.

Next, the duct, the method for manufacturing the duct, and the apparatus for manufacturing the duct according to the present invention will be described below with reference to the accompanying drawings with reference to suitable examples.

As shown in FIG. 1, the duct 10 according to the embodiment has a tubular shape in which an air flow passage 12 through which air flows is provided inside, and the air flow passage 12 from the air inlet 10a to the air outlet 10b is three-dimensional. It is formed so as to bend. The duct 10 of the embodiment has a shape curved so that the air outlet 10b is laterally oriented with respect to the air inlet 10a. The duct 10 is defined by at least a part of the air flow passage 12 by a first division 14 and a second division 16 which are assembled by a claw fitting structure with their edges abutting each other. In the embodiment, a part of the duct 10 on the air outlet 10b side is composed of a square tubular portion of the second division 16. Most of the duct 10 other than the air outlet 10b side has a square tube shape by combining two square groove-shaped split bodies 14 and 16.

Each of the split bodies 14 and 16 is a molded product obtained by injection molding or the like, using a solid resin (solid synthetic resin) such as polypropylene (PP) or high-density polyethylene (HDPE) as a material. Since the duct 10 is composed of two split bodies 14, 16 divided along the air flow direction of the air flow passage 12, the extending direction of the edge of each of the split bodies 14, 16 is along the air flow direction. ing. In the following description, the extending direction of the edge in the split bodies 14 and 16 may be referred to as the air flow direction. Further, in the split bodies 14 and 16, the direction in which the two edges along the air flow direction are lined up is referred to as the left-right direction, and the direction away from the air flow passage 12 in the left-right direction is referred to as the outside, and the air in the left-right direction. The direction toward the flow passage 12 is called the inside.

As shown in FIG. 3, the first division 14 is formed in a square groove shape that opens downward by the upper wall 14a and the left and right side walls 14b and 14b extending downward from both side edges of the upper wall 14a. The second body 16 is formed in a square groove shape that opens upward by the lower wall 16a and the left and right side walls 16b and 16b extending upward from both side edges of the lower wall 16a. A part of the second body 16 on the air outlet 10b side is formed in a square cylinder shape. The duct 10 is assembled so that the lower end of the lateral wall 14b in the first division 14 and the upper end of the lateral wall 16b in the second division 16 are butted against each other. In the embodiment, the first division 14 constitutes the upper half of the duct 10, and the second division 16 constitutes the lower half of the duct 10.

As shown in FIG. 3, at the lower end edge of each side wall 14b in the first body 14, a collar portion 18 projecting outward from the side wall 14b and extending downward from the collar portion 18 below the lower end of the side wall 14b. An extension portion 20 is formed. In the first body 14 of the embodiment, the extension portion 20 is arranged outside the lower end of the lateral wall 14b. As shown in FIG. 3, at the upper end edge of each side wall 16b in the second body 16, the side wall 16b, the outer wall 22 arranged to face the outside of the side wall 16b, and the bottom connecting the side wall 16b and the lower end of the outer wall 22 are connected. A groove shape that opens upward is formed by the wall 24. As shown in FIG. 3B, the duct 10 is assembled by fitting the extension portion 20 formed at the end edge of the first division 14 into the groove shape formed at the end edge of the second division 16. ..

As shown in FIG. 3B, in the first division 14 and the second division 16, the edges of one of the side walls 14b and 16b rising from the bottoms (upper wall 14a or lower wall 16a) are butted against each other. Can be assembled. Further, the first division 14 and the second division 16 are assembled by abutting the edges of the other side walls 14b and 16b rising from their respective bottoms (upper wall 14a or lower wall 16a). As shown in FIG. 3B, in the first division 14 of the embodiment, the wall dimensions a1 and a2 from the upper wall 14a to the lower end edge of the lateral walls 14b and 14b are different on the left and right. Similarly, in the second division 16 of the embodiment, the wall dimensions b1 and b2 from the lower wall 16a to the upper end edge of the side walls 16b and 16b are different on the left and right. Then, the wall dimension a1 of one side wall 14a in the first division 14 and the wall dimension b2 of the other side wall 16b in the second division 16 are the same, and the wall of the other side wall in the first division 14 is the same. The dimension a2 and the wall dimension b1 of one side wall 16b in the second division 16 are the same. By doing so, the amount of deformation of the lateral walls 14b and 16b due to molding shrinkage can be made equal between the first division 14 and the second division 16, and the first division 14 and the second division 16 can be made equal. It becomes easy to assemble with.

Next, a claw fitting structure for connecting the first division 14 and the second division 16 will be described. As shown in FIGS. 1 and 2, a plurality of locking portions 26 are provided on the edge of the first division 14 so as to project toward the second division 16 side apart from each other in the air flow direction. There is. The locking portion 26 protrudes downward from the flange portion 18 of the first division 14 (on the side of the second division 16) from the extension portion 20. As shown in FIG. 5, the tip portion of the locking portion 26 is provided with a locking projection 26a protruding outward that intersects the protruding direction of the locking portion 26. Further, the locking portion 26 can be elastically deformed in the inward and outward directions of the duct 10. As shown in FIGS. 4 and 5, the first division 14 includes a straightening recess 28 formed at the base of the locking portion 26 and opening to the opposite side (upward) of the protruding direction of the locking portion 26. ing. The straightening recess 28 is a recess surrounded by a wall in the air flow direction and the inside / outside direction. The straightening recess 28 is formed so that the width along the air flow direction is equal to or less than the width of the locking portion 26.

As shown in FIGS. 1 and 2, a plurality of locking receiving portions 30 separated from each other in the air flow direction are provided at the edge of the second division 16 corresponding to the locking portions 26. The locking receiving portion 30 can accept the locking portion 26, and when the end edge of the first division 14 and the end edge of the second division 16 are butted against each other, the locking portion 26 is pulled out of the locking portion 26 that is caught by itself. It is configured to stop. As shown in FIG. 5, the locking receiving portion 30 of the embodiment is formed so as to penetrate the bottom wall 24 connecting the outer wall 22 and the lateral wall 16b at the groove-shaped edge of the second body 16. Has been done. The upper portions of the outer wall 22 and the side wall 16b constituting the locking receiving portion 30 are tapered so as to guide the locking portion 26. Further, the lateral wall 16b constituting the locking receiving portion 30 is provided with a guide surface 32 projecting outward from the top to the bottom, and the locking projection 26a of the locking portion 26 is an opening edge of the locking receiving portion 30. It is designed to guide you to get caught in. In the claw fitting structure, the locking projection 26a of the locking portion 26 inserted into the locking receiving portion 30 is hooked on the lower surface of the opening edge on the outer wall 22 side of the locking receiving portion 30, so that the first body 14 and the first body 14 The movement in the direction in which the dichotomies 16 are relatively separated from each other is restricted, and the assembled state of the first subdivision 14 and the second subdivision 16 is maintained.

Next, a manufacturing apparatus 40 for assembling the first body body 14 and the second body body 16 made of synthetic resin with their end edges abutting against each other to form a duct 10 will be described. As shown in FIG. 5, the manufacturing apparatus 40 includes a first holding means 42 configured to hold the first body 14 and a second holding means 44 configured to hold the second body 16. I have. The first holding means 42 of the embodiment is configured to be operable from a state in which the first body 14 can be attached in an upright posture to a state in which the locking portion 26 (end edge) of the first body 14 is directed downward. Has been done. Further, the second holding means 44 of the embodiment is configured so that the second body 16 can be attached with the end edge facing upward. Then, in the manufacturing apparatus 40, the first holding means 42 and the second holding means 44 are relatively close to each other and separated from each other. The first holding means 42 has a straightening claw portion 46 that can be inserted into the straightening recess 28 formed in the first body 14. The left and right straightening claws 46 corresponding to the left and right straightening recesses 28 are arranged according to the design values of the first body 14. The first holding means 42 is configured to be able to hold the first body 14 in a state where the straightening claw portion 46 is inserted into the straightening recess 28 to correct the position of the locking portion 26. The second holding means 44 includes an insertion receiving portion 48 that supports the locking receiving portion 30 of the second body 16. The insertion receiving portion 48 is arranged at a position shifted from the opening of the locking receiving portion 30 in the air flow direction so as not to interfere with the locking portion 26 fitted in the locking receiving portion 30. The first holding means 42 and the second holding means 44 are configured to be relatively displaceable so that the held first division 14 and the second division 16 are close to each other.

Next, a method of manufacturing the duct 10 using the manufacturing apparatus 40 will be described. First, a second locking portion 26 provided so as to project from the edge edge, and a straightening recess 28 formed at the root portion of the locking portion 26 and opening to the side opposite to the protruding direction of the locking portion 26. The 1-part body 14 is molded with a synthetic resin by injection molding or the like. Separately from the first body 14, the second body 16 having a locking receiving portion 30 capable of receiving the locking portion 26 at the end edge is molded from synthetic resin by injection molding or the like. The straightening claw portion 46 is inserted into the straightening recess 28, and the first body 14 is set in the first holding means 42. Since the straightening claw portion 46 is arranged according to the design value of the first body 14, the side wall 14b and the locking portion 26 are positioned as designed by fitting the straightening claw portion 46 into the straightening recess 28. To be corrected. Further, the second body 16 is set in the second holding means 44. The second body 16 set in the second holding means 44 is in a state in which the locking receiving portion 30 is supported by the insertion receiving portion 48. Then, the first division 14 set in the first holding means 42 and the second division 16 set in the second holding means 44 face each other at the edges, and the first holding means 42 and the second holding means 42 and the second holding means 42 face each other. It is relatively close to 44. As a result, the locking portion 26 fits into the locking receiving portion 30 and the end edges abut against each other, and the first division 14 and the second division 16 are assembled to obtain the duct 10.

Since the duct 10 is provided with a straightening recess 28 at the base of the locking portion 26 in the first body 14, the straightening recess 28 is hooked on the straightening recess 28, and for example, a lateral wall 16b that has fallen inward due to molding shrinkage or the like. The locking portion 26 can be displaced outward to return to the designed position. Then, when the first division 14 and the second division 16 are assembled in the corrected state, the locking portion 26 can be smoothly fitted into the locking receiving portion 30. As described above, due to the misalignment of the locking portion 26, the locking portion 26 excessively interferes with the locking receiving portion 30, the locking portion 26 does not fit into the locking receiving portion 30, and the like. It is possible to prevent poor engagement and facilitate the assembly of the first division 14 and the second division 16. Then, the manufacturing efficiency of the duct 10 can be improved by facilitating the assembly of the first body 14 and the second body 16.

By providing the straightening recess 28 at the root of the locking portion 26, it is possible to easily set the locking portion 26 at an appropriate position when the position is corrected using the straightening recess 28. Further, since the straightening recess 28 is formed in a concave shape at the base of the locking portion 26, it is inconspicuous, and the influence on the appearance of the duct 10 can be reduced. Since the straightening recess 28 only adds a groove shape to the conventional configuration of the locking portion 26, it can be performed with a simple mold structure. Further, since the straightening recess 28 is arranged by using a space for projecting the locking portion 26 to the outside in order to avoid the lateral wall 16b of the second body 16, the straightening recess 28 can be provided. It does not lead to an increase in the size of the stop portion 26. In particular, by reducing the width of the straightening recess 28 along the air flow direction to be equal to or less than the width of the locking portion 26 along the air flow direction, the space for arranging the straightening recess 28 can be minimized. When the concave straightening recess 28 is formed at the root of the locking portion 26, the straightening recess 28 also functions as a meat steal, preventing molding shrinkage and suppressing the inward tilt of the locking portion 26.

(Change example)
Not limited to the above-described configuration, for example, the following may be used.

(1) In the embodiment, the correction recess 28 is provided only in the first division 14, but the correction portion 50 used for correcting the position of the edge of the second division 16 is not limited to this. It may be provided at the edge of the.
The straightening portion 50 according to the first embodiment shown in FIG. 7 is provided between the opening of the locking receiving portion 30 and the lateral wall 16b of the second body 16. The straightening portion 50 is formed in a concave shape that opens downward (opposite to the first body 14). In the first embodiment, the straightening portion 50 is provided in the space swelled by the guide surface 32 protruding outward.
The straightening portion 52 according to the second embodiment shown in FIG. 8 is provided on the bottom wall 24 that forms a groove shape at the end edge of the second body 16. The straightening portion 52 is formed in a concave shape that opens downward (on the side opposite to the first body 14).
The straightening portion 54 according to the third embodiment shown in FIG. 9 is provided on the bottom wall 24 that forms a groove shape at the end edge of the second body 16. The straightening portion 54 is formed in a convex shape extending the outer wall 22 downward (opposite to the first body 14). When the second body 16 constitutes the lower side of the duct 10, even the convex straightening portion 54 is hidden, so that the influence on the appearance is small.
In the first to third embodiments, the second holding means 44 is provided with the straightening body 56 corresponding to the straightening portions 50, 52, 54, and the straightening body 56 is hooked on the straightening portions 50, 52, 54 to form the second split body 16. Is set in the second holding means 44. Here, the straightening body 56 is arranged according to the design value of the second dividing body 16. Therefore, by hooking the straightening body 56 on the straightening portions 50, 52, 54, the lateral wall 16b and the locking receiving portion 30 can be straightened so as to be in the positions as designed.
The straightening portion 52 of the second embodiment and the straightening portion 54 of the third embodiment may be provided separately from the locking receiving portion 30, but are arranged adjacent to the locking receiving portion 30 as shown in FIG. Is preferable. By doing so, it is possible to easily set the locking receiving portion 30 to an appropriate position when the position correction using the straightening portions 52 and 54 is performed.

(2) In the embodiment, the upper part of the duct is formed by the first dividing body and the lower part of the duct is formed by the second dividing body, but the lower part of the duct is formed by the first dividing body. The upper part of the duct may be composed of two parts. The duct is not limited to the configuration in which the first division and the second division are divided into upper and lower parts, and the division mode of the duct can be appropriately changed, such as dividing the duct into left and right parts.
(3) In the embodiment, the first and second halves are configured to surround an area of about half of the air flow passage, but the first and second halves surrounding the air flow passage The ratio of may be changed as appropriate.
(4) The present invention can be applied to an intake duct, a brake duct, an air conditioning duct, and the like.

10 ducts, 12 air flow passages, 14 1st division, 16 2nd division, 26 locking part,
28 Orthodontic recess, 30 Locking receiver, 42 1st holding means, 44 2nd holding means,
46 Orthodontic part, 50 Orthodontic part, 52 Orthodontic part, 54 Orthodontic part

Claims (5)

A duct in which at least a part of the air flow passage is defined by the first and second divisions assembled by abutting the edges of each other.
The first and second parts are molded products of synthetic resin.
The first segment is
A locking portion provided so as to project from the edge of the first division toward the second division, and
A straightening recess formed at the base of the locking portion and opening to the side opposite to the protruding direction of the locking portion is provided.
When the locking portion is responsively provided on the edge of the second body and the edge of the first body is abutted against the edge of the second body, the second body is provided. The duct is provided with a locking receiving portion that catches on the locking portion and prevents the locking portion from coming off. The duct according to claim 1, wherein a straightening portion used for correcting the position of the edge is formed on the edge of the second body. The duct according to claim 1 or 2, which is formed into a square cylinder by the first division and the second division. A method of manufacturing a duct in which at least a part of an air flow passage is defined by a first division and a second division assembled by abutting the edges of each other.
A locking portion provided so as to project from the edge toward the second body side, and a straightening recess formed at the root portion of the locking portion and open to the side opposite to the protruding direction of the locking portion. The first divided body to be provided is molded with a synthetic resin and provided.
The second body, which is provided on the edge edge so as to accept the locking portion and has a locking receiving portion that catches on the locking portion and prevents the locking portion from coming off, is molded from a synthetic resin.
After inserting the straightening claw portion into the straightening recess and correcting the position of the locking portion, the first body is set in the first holding means.
The second division set in the second holding means and the first division set in the first holding means are relatively close to each other, and the locking portion is fitted into the locking receiving portion. A method for manufacturing a duct, which comprises assembling a first body and a second body. It is a duct manufacturing device configured by assembling the first and second parts made of synthetic resin with their edges abutting each other.
The straightening claw portion is formed at the root portion of the locking portion protruding from the edge of the first division and can be inserted into a straightening recess that opens to the side opposite to the protruding direction of the locking portion. A first holding means configured to be able to hold the first body in a state where the straightening claw portion is inserted into the recess and the position of the locking portion is corrected.
A second holding means configured to hold the second body, which is provided with a locking receiving portion capable of receiving the locking portion at an end edge, is provided.
The duct manufacturing apparatus, wherein the first holding means and the second holding means are configured to be relatively displaceable so as to fit the locking portion into the locking receiving portion.

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