JP5399572B2 - Vehicular duct and its mounting structure - Google Patents

Description

  The present invention relates to a vehicular duct used as an air conditioning duct or the like and a mounting structure thereof.

  An air conditioning duct is attached to the vehicle. The air-conditioning duct has a predetermined position between both ends, for example, a central portion attached to the vehicle body via a duct attaching member, and both end portions are connected to the counterpart device.

As a conventional duct mounting structure, as shown in FIG. 8, a mounting member 90 having opposing mounting wall surfaces 91, 91 is used, a duct 80 is disposed between the mounting wall surfaces 91, 91, and a rivet 95 is used to There are some which fasten the pipe wall 81 to the mounting wall surfaces 91, 91.
However, in this mounting structure, a rivet is required as a separate part, and the troublesome work of hitting the rivet is required, resulting in an increase in parts cost and work cost.

  Moreover, the attachment structure which fixes the pipe wall of a duct to a support pipe with a screw screw is also known (refer patent document 1). However, this mounting structure also requires a screw screw as a separate part and a screwing operation as in the mounting structure using rivets.

  Also, a mounting portion made of a projecting piece that can be expanded and deformed is provided on the outer surface of the duct wall, while a slit is formed in the mounted portion on the vehicle body side, and the mounting portion is inserted into the slit to be expanded. An attachment structure has been proposed (see Patent Document 2). However, in this mounting structure, the structure of the mounting portion is complicated, and the mounting portion cannot be correctly inserted into the slit due to variations in duct molding or mounting of the mounted portion on the vehicle body side. Cases may occur.

JP-A-9-207548 JP 2002-327716 A

  The present invention has been made in view of the above points, and when installing the duct, it is possible to reduce other parts such as rivets and screw screws and simplify the installation work, and variations in forming the duct, An object of the present invention is to provide a vehicle duct and its mounting structure that are less susceptible to mounting properties due to variations in assembly on the vehicle body side.

  The invention according to claim 1 is a vehicle duct that is mounted between the mounting wall surfaces facing each other with the mounting wall surface in which the mounting hole is formed, and is inserted into the facing tube wall in the middle of the flow path of the duct into the mounting hole. The tapered projecting portion is provided so as to protrude to the outside of the duct, and the opposing tube wall is provided with a wave-shaped bent portion surrounding the projecting portion.

  According to a second aspect of the present invention, in the vehicle duct mounting structure for mounting the vehicle duct according to the first aspect between the mounting wall surfaces, the mounting hole is provided in the projecting portion of the vehicle duct. It is formed to be larger than the outer diameter of the top portion and smaller than the outer diameter of the bottom portion, and the protruding portion is inserted into the mounting hole.

  According to the duct of the first aspect of the present invention, the duct can be attached by inserting the tapered protrusions formed on the opposite pipe wall in the middle of the duct flow path into the attachment hole of the attachment wall surface. And other parts such as screws and screws can be reduced, and the mounting operation can be simplified. Further, the tapered protrusion inserted into the mounting hole is thin on the top side and thick on the bottom side due to its tapered shape, so that the mounting hole is larger than the outer diameter of the top of the protruding part of the duct, and the bottom If it is smaller than the outer diameter of the duct, even if the positional relationship between the projecting part of the duct and the mounting hole changes slightly due to variations in molding of the duct or assembly on the vehicle body side, the narrow top part of the projecting part By inserting the side into the mounting hole, the top and bottom of the projecting portion can be locked to the inner edge of the mounting hole, and it is possible to prevent the duct from being difficult to mount.

  According to the duct of the first aspect of the present invention, a wave-shaped bent portion is provided on the opposite pipe wall of the duct so as to surround the protruding portion, whereby a pressing force is applied to the protruding portion from the top side to the bottom side. In this case, the protrusion is displaced inward of the duct by being deformed by the wave-shaped bent portion. Therefore, the outer diameter of the protruding portion becomes larger than the regular outer diameter due to variations in the molding of the duct, or the interval between the mounting holes facing each other becomes smaller than the regular interval due to variations in the assembly on the vehicle body side. When the projecting portion of the duct is inserted into the mounting hole, the inclined surface or the convex rib in the tapered projecting portion strongly interferes with the inner edge of the mounting hole, and the projecting portion becomes inward of the duct (projecting). In this case, the wavy bent portion formed around the protruding portion of the duct is deformed and the protruding portion becomes the duct. Since it is displaced inward, it becomes possible to attach the duct while absorbing the variation in the molding of the duct and the variation in the assembly on the vehicle body side.

  According to the duct mounting structure of the second aspect of the present invention, the duct can be mounted by inserting the projecting portion formed on the opposite pipe wall in the middle of the duct flow path into the mounting hole of the duct mounting member. In addition, other parts such as rivets and screw screws can be reduced, and the mounting operation can be simplified. Furthermore, by forming the mounting hole larger than the outer diameter of the top portion of the projecting portion of the vehicle duct and smaller than the outer diameter of the bottom portion, and the tapered projecting portion inserted into the mounting hole has a shape thereof. Due to the narrowness at the top side and the thickening at the bottom side, even if the positional relationship between the protruding part of the duct and the mounting hole changes slightly due to variations in duct molding or assembly on the vehicle body side, By inserting the narrow top portion side of the projecting portion into the attachment hole, the top portion and the bottom portion of the projecting portion can be locked to the inner edge of the attachment hole, and it is possible to prevent the attachment from becoming difficult.

It is a perspective view of the duct for vehicles concerning one example of the present invention. It is 2-2 sectional drawing of FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 2. It is a perspective view of the protruding part of FIG. It is sectional drawing which shows the time of attaching a duct. It is sectional drawing which shows the state which attached the duct. It is 7-7 sectional drawing of FIG. It is sectional drawing which shows the attachment state of the conventional duct.

  1 is a perspective view of a duct for a vehicle according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line 2-2 in FIG. 1, FIG. 3 is a sectional view taken along line 3-3 in FIG. FIG. 5 is a cross-sectional view when the vehicle duct is inserted between the mounting wall surfaces of the mounting member, FIG. 6 is a cross-sectional view showing a mounting state of the vehicle duct, and FIG. FIG.

  The vehicle duct shown in FIGS. 1 and 2 is used as an air conditioning duct or the like of a vehicle. As shown in FIG. 6, mounting wall surfaces 71 and 71 in which mounting holes 73 and 73 are formed are opposed to each other. It is attached between the mounting wall surfaces 71, 71 of the duct mounting member 70, and is attached to the vehicle via the mounting wall surfaces 71, 71. The mounting wall surfaces 71 and 71 are not limited to those formed on a single mounting member, and may be provided so as to protrude from other vehicle parts and the like.

  The vehicle duct 10 is made of a blow molded product of a thermoplastic synthetic resin and has a tubular shape. Both ends 11 and 13 of the duct 10 are formed with flanges 12 and 14 for attachment to a counterpart device, and the inside between the both ends 11 and 13 is an air flow path 10a. The tube wall 15 in the middle of the flow path 10a between the both ends 11 and 13 is composed of two sets of opposed tube walls 15a, 15a, 15b and 15b. In the illustrated example, the vehicle duct 10 is in the shape of a square pipe having a square cross section over its entire length. However, the present invention is not limited thereto, and a part of the middle of the flow path 10a between both ends 11 and 13 is formed. It may be a quadrangular cross-section and the other part is configured by an arc surface, or a round pipe configured by an arc surface over the entire length of the duct 10.

  Each of the pair of opposing tube walls 15a, 15a is formed with a tapered protrusion 17 that is inserted into the mounting hole 73 of the duct mounting member 70 so as to protrude outward from the duct. The protruding portion 17 of the embodiment has a truncated cone shape. The size of the frustoconical protrusion 17 is appropriately determined depending on the size of the duct 10 and the like. As an example, the outer diameter d1 of the top 18 is 30 mm, the outer diameter d2 of the bottom 19 is 50 mm, and the height h is 30 mm. The shape of a truncated cone consisting of Opposing tube walls 15 a and 15 a on which the protruding portion 17 is formed are surfaces facing the mounting wall surfaces 71 and 71 of the mounting member 70.

  As shown in the cross-sectional views of FIGS. 2 and 3 and the perspective view of FIG. 4, the frustoconical protrusion 17 is formed on the inclined surface 21 corresponding to the side surface between the top portion 18 and the bottom portion 19. Convex ribs 23 are formed in the trapezoidal height direction k. The ribs 23 of the ridges are formed at a plurality of locations in the circumferential direction j on the truncated cone-shaped inclined surface 21. In the present embodiment, the protruding ribs 23 are formed at two locations on the inclined surface 21 at intervals of 180 degrees. The ribs 23 of the ridges are not limited to 180 degree intervals, but may be other angular intervals such as 120 degree intervals. Although the protrusion dimension (height) from the said inclined surface 21 in the rib 23 of the said protruding item | line is determined suitably, 3 mm is mentioned as an example.

  The inclined surface 21 is provided with a V-shaped bent groove 25 in the height direction k of the truncated cone shape at a position between the ribs 23 of the ridge. Furthermore, a V-shaped bent groove 27 connected to the V-shaped bent groove 25 of the inclined surface 21 is formed in the truncated cone-shaped top portion 18, and the V-shaped bent groove 25 of the inclined surface 21 and the V of the top portion 18 are formed. The bent groove 27 is a series. The V-shaped bent grooves 25 and 27 have a groove shape bent (bent) into the frustoconical shape inward, and have an appropriate depth and groove width (opening width), for example, a depth of 5 mm. The groove width is 5 mm. In this embodiment, the V-shaped bent groove 25 is formed at a position of 90 degrees in the circumferential direction j of the frustoconical shape from the ribs 23 of the ridges provided at intervals of 180 degrees. The portions of the V-shaped bent grooves 25 and 27 are further bent when the pressing force is applied to the truncated cone-shaped inclined surface 21 from the outside to reduce the groove width, thereby reducing the outer diameter of the truncated cone shape. Let

  On the opposing tube walls 15a, 15a where the projecting portions 17, 17 are formed, a wave-shaped bent portion 29 is formed in an annular shape surrounding the projecting portion 17, and the wave-shaped bent portion 29 The protrusion 17 can be deformed in the height k (equal to the height of the truncated cone). In addition, the number and height difference of the waveform peak part (top part) and valley part (bottom part) in the waveform waveform bending part 29 are determined suitably.

  As shown in FIG. 5, the mounting structure of the vehicle duct 10 is configured such that the vehicle duct 10 is inserted between mounting wall surfaces 71, 71 facing the duct mounting member 70, as shown in FIGS. 6 and 7. The projecting portions 17 and 17 of the duct 10 are inserted into the mounting holes 73 and 73, respectively.

  The mounting member 70 has a U shape in which one end of the mounting wall surfaces 71, 71 facing each other is connected by a connection wall surface 72, and is fixed to the vehicle at the portion of the connection wall surface 72. A distance s between the mounting holes 73 and 73 in the mounting wall surfaces 71 and 71 facing each other is larger than a distance s1 between the bottom portions 19 and 19 of the projecting portions 17 and 17 in the vehicle duct 10 and the projection. The distances s <b> 2 between the top portions 18 and 18 of the shape portions 17 and 17 are set to be smaller. Further, the diameter d3 of the mounting hole 73 of the mounting wall surface 71 is larger than the outer diameter d1 of the top portion 18 in the projecting portion 17 and smaller than the outer diameter d2 of the bottom portion 19. The outer diameter d1 of the top portion 18 is an outer diameter of a circle passing through the surface of the convex rib 23 on the inclined surface 21, while the outer diameter d2 of the bottom portion 19 is a convex rib on the inclined surface 21. 23 is the outer diameter of a circle passing through the surface of 23. Further, the mounting member 70 is not limited to a U-shape in which one end of the mounting wall surfaces 71 and 71 is connected by a connecting wall surface 72, and the mounting wall surfaces 71 and 71 are directly fixed to the vehicle at one end side. Alternatively, the mounting wall surfaces 71 and 71 may be formed so as to protrude from other vehicle parts.

  When the vehicle duct 10 is installed, if the vehicle duct 10 is inserted between the opposing mounting wall surfaces 71, 71, the open ends 71 a, 71 a of the opposing mounting wall surfaces 71, 71 become the projecting portions 17, 17. Of the mounting wall surfaces 71, 71 in contact with the inclined surfaces 21, 21 or the convex ribs 23, 23 and moving toward the top portions 18, 18 on the inclined surfaces 21, 21 or the convex ribs 23, 23. The space between the open ends 71a and 71a is expanded. When the vehicle duct 10 is further inserted into the mounting member 70 and the tops 18 and 18 of the protrusions 17 and 17 reach the positions of the mounting holes 73 and 73, the protrusions are inserted into the mounting holes 73 and 73. 17 and 17 are inserted, the opposing mounting wall surfaces 71 and 71 are restored from the previously expanded state in a direction approaching each other, and the projecting portions 17 and 17 are locked to the inner edges of the mounting holes 73 and 73. Then, the vehicle duct 70 is attached to the attachment wall surfaces 71, 71. Then, with the projections 17 and 17 inserted in the mounting holes 73 and 73, the vehicle duct 10 is slightly rotated around the projections 17 and 17 to match the counterpart device.

  In the mounting structure, separate parts such as rivets and screw screws can be reduced, and a rivet fastening operation and a tightening operation such as a screw screw are not required, so that the duct mounting operation can be simply performed. Further, the tapered protrusion 17 of the duct 10 inserted into the attachment hole 73 is thin on the top 18 side and thick on the bottom 19 side, so that the attachment hole 73 is formed on the protrusion 17 of the duct 10. By making the outer diameter d1 of the top portion 18 larger than the outer diameter d2 of the bottom portion 19 and smaller than the outer diameter d2 of the bottom portion 19, the projecting portion 17 of the duct 10 is caused by variations in molding of the duct 10 or variations in assembly on the vehicle body side. Even if the positional relationship between the mounting hole 73 is slightly changed, the top 18 side of the protruding portion 17 can be inserted into the mounting hole 73 and the protruding portion 17 can be locked to the inner edge of the mounting hole 73. .

  Further, when the truncated cone-shaped projecting portion 17 is inserted into the mounting hole 73 by the convex ribs 23 formed on the truncated cone-shaped inclined surface 21 in the projecting portion 17, the inner edge of the mounting hole 73 is formed. Since the contact area between the projecting portion 17 and the sliding resistance is reduced, it is easy to insert the projecting portion 17 into the mounting hole 73 so that the opening of the duct 10 is properly aligned to the normal position. Become.

  Further, the frustoconical inclined surface 21 of the projecting portion 17 is pressed from the outside by the V-shaped bent grooves 25 and 27 provided between the ribs 23 of the ridge and the top portion 18 of the truncated cone shape. At this time, the V-shaped bent grooves 25 and 27 are bent and deformed to reduce the outer diameter of the truncated cone shape. For this reason, the protrusion 17 of the duct 10 is displaced from the center of the mounting hole 73 due to variations in the molding of the duct 10 or variations in the assembly on the vehicle body side, and the protrusion 17 is inserted into the mounting hole 73. Even if the truncated cone-shaped inclined surface 21 or the convex rib 23 strongly interferes with the inner edge of the mounting hole 73 and is pressed from the outside, the V-shaped bent grooves 25 and 27 are bent to form a truncated cone shape. By reducing the outer diameter, it becomes easy to correctly insert the duct 10 by inserting the protruding portion 17 into the mounting hole 73 to the normal position.

  Further, the pipe wall 15a, 15a on which the projecting portions 17, 17 are formed is provided with a wave-shaped bent portion 29 surrounding the projecting portion 17, so that the projecting portion 17 has a top 18 side. When a pushing force is applied to the bottom 19 side from the side, the wave-shaped bent portion 29 is deformed and the projecting portion 17 is displaced inward of the duct 10. Accordingly, the outer diameter of the protrusion 17 becomes larger than the regular outer diameter due to the variation in the molding of the duct 10, or the distance between the mounting holes 73, 73 facing each other due to the variation in the assembly on the vehicle body side is the regular distance. When the projecting portion 17 of the duct 10 is inserted into the mounting hole 73, the inclined surface 21 or the convex rib 23 of the projecting portion 17 strongly interferes with the inner edge of the mounting hole 73. When the projecting portion 17 is pressed inward of the duct, the wave-shaped bent portion 29 formed surrounding the projecting portion 17 of the duct 10 is deformed, and the projecting portion 17 is displaced inward of the duct. Therefore, it becomes possible to attach the duct by absorbing the variation in the molding of the duct and the variation in the assembly on the vehicle body side.

DESCRIPTION OF SYMBOLS 10 Vehicular duct 15a Opposite pipe wall 17 Protruding part 18 Top part of projecting part 19 Bottom part of projecting part 21 Inclined surface 25, 27 V-shaped bending groove 29 Wave-shaped bending part 70 Mounting member 71 Mounting wall surface 73 Mounting hole

Claims (2)

A vehicle duct that is mounted between the mounting wall surfaces facing each other with mounting wall surfaces that form mounting holes,
A tapered projecting portion to be inserted into the mounting hole is provided on the opposite tube wall in the middle of the flow path of the duct so as to protrude to the outside of the duct,
A vehicular duct characterized in that a wave-shaped bent portion is provided around the protruding portion on the opposing tube wall. In the vehicle duct mounting structure for mounting the vehicle duct according to claim 1 between the mounting wall surfaces,
The mounting wall is formed with the mounting hole larger than the outer diameter of the top of the protruding portion of the vehicle duct and smaller than the outer diameter of the bottom,
A mounting structure for a vehicle duct, wherein the protruding portion is inserted into the mounting hole.

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