JP2003050043A - Connecting structure of air diffuser and air duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the connecting structure of an air diffuser and an air duct, which is capable of securing high sealing performance as well as stabilized connecting condition and capable of working inexpensively and easily. SOLUTION: In the connecting structure, the tubular parts 32, 42 for the connection of the air ducts 31, 41 are fitted externally to the tubular parts 12, 22 for the connection of the air diffusers 11, 21. Bead parts 37, 47 having substantially the same thickness as the general parts 35, 45 around the same are projected on the whole inner peripheral surface of the tubular parts 32, 42 for connecting the air ducts 31, 41. Upon connection, the projected ends 37a, 47a of the bead parts 37, 47 are contacted with the whole outer peripheral surface in the tubular parts 12, 22 of the air diffusers 11, 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure between an air blowing device and an air duct, and more particularly to a connection structure that can secure a high sealing property and a stable connection state and can be installed easily at low cost.

[0002]

2. Description of the Related Art For example, an air blowing device for a vehicle, an air duct for blowing air to this device,
The following connection structure was adopted for the connection.

That is, as in the conventional example 1 shown in FIG. 5, a predetermined clearance is provided between the outer peripheral side of the connecting cylinder portion 72 of the air blowing device 71 and the inner peripheral side of the connecting cylinder portion 82 of the air duct 81. (For example, the total along the radial direction is about 1 mm.
The clearance is provided, and the connection cylinder part 82 is mounted on the connection cylinder part 72.

According to this prior art example 1, the labor and cost for construction can be reduced, but since there is a gap corresponding to the above-mentioned clearance in the connecting portion of both connecting cylinder portions 72, 82, both connecting cylinder portions are provided. There is a possibility that the 72 and 82 may be accidentally detached, or "wind leakage" may occur from the connecting portion of the connecting tubular portions 72 and 82. Further, there is a possibility that rattling may occur at the connecting portion between the connecting tubular portions 72 and 82.

On the other hand, as in the conventional example 2 shown in FIG. 6, an intermittent or continuous revolving fitting claw 75a is projected on the outer peripheral surface of the connecting cylinder portion 72a of the air blowing device 71a, and A connection structure in which a fitting concave portion 85a is provided in the connecting cylinder portion 82a of the air duct 81a, and the fitting claw 75a and the fitting concave portion 85a are fitted to each other, and the connecting cylinder portion 72a is covered with the connecting cylinder portion 82a. Was also used.

Further, as in Conventional Example 3 shown in FIG. 7, between the outer peripheral surface of the connecting cylinder portion 72b of the air blowing device 71b and the inner peripheral surface of the connecting cylinder portion 82b of the air duct 81b,
Circular seal member (urethane etc.) 86b
Also, a connecting structure in which the connecting cylinder portion 82b is externally mounted on the connecting cylinder portion 72b in a state where the above is interposed is also used.

According to the conventional example 2 and the conventional example 3, both connecting cylinder portions 72a and 82a (72b and 82) are connected.
Inadvertent removal of b), or both connecting cylinders 72a and 82a
"Air leakage" etc. from the connecting part of (72b ・ 82b)
Although it can be accurately prevented, the following problems occur.

That is, according to the second conventional example, when the connecting cylinder portion 82a is covered with the connecting cylinder portion 82a, the connecting cylinder portion 82a is greatly expanded according to the protruding amount of the fitting claw 75a. Since this is necessary, the labor for construction increases. Further, at the time of this work, it is necessary to apply a large insertion force to the connecting cylinder portion 82a and push it into the connecting cylinder portion 72a side, so that the air duct 71a may be deformed unnecessarily. A similar problem occurs when the connecting tube portions 72a and 82a are detached for maintenance.

Further, according to the conventional example 3, the seal member 86
The number of parts increases due to the inclusion of b, which increases the labor and cost for construction.

The present invention has been made in view of the above point of view, and it is possible to secure a high sealing performance and a stable connection state, and at the same time, it is possible to carry out the construction inexpensively and easily, "a connection structure between an air blowing device and an air duct". The purpose is to provide.

[0011]

A connection structure (hereinafter referred to as a connection structure) for connecting an air blowing device and an air duct according to the present invention has a connecting cylinder portion of an air duct with respect to a connecting cylinder portion of an air blowing device. A connection structure that is externally mounted and is configured by connecting the air blowing device and the air duct,
On the inner peripheral surface of the connecting cylinder portion of the air duct, there is formed a bead portion projecting in a circular shape over the entire circumference with a wall thickness substantially equal to that of the surrounding general portion, and the protruding end of the bead portion at the time of exterior packaging. Is brought into contact with the entire circumference of the outer peripheral surface of the connecting tube portion of the air blowing device to make a connection.

A plurality of the bead portions may be arranged along the axial direction of the connecting cylinder portion of the air duct.

Further, in the connection structure according to the present invention, it is desirable that the air duct is manufactured by blow molding.

[0014]

In the connection structure according to the first aspect of the present invention, when the connection is completed, the projecting end of the bead portion formed in a circular shape is brought into contact with the entire circumference of the outer peripheral surface of the connecting cylinder portion of the air blowing device. . Therefore, the connecting portion between the air blowing device and the air duct is uniformly sealed over the entire circumferential region around the shaft center of both connecting cylinder portions, so that the sealing performance of this connecting portion can be reliably ensured.

Further, since the projecting end of the bead portion comes into contact with the entire peripheral area of the outer peripheral surface of the connecting cylinder portion of the air blowing device, there is no rattling and the unintentional disengagement of both connecting cylinder portions is ensured. It can be prevented, and a stable connection state can be secured.

Further, in order to secure the sealing performance of the connecting portion between the air blowing device and the air duct, it is not necessary to interpose a separate sealing member between both connecting cylinder portions,
The labor and cost for construction of the connection structure can be reduced.

Further, in the present connection structure, of the two connecting tubular portions to be connected, the connecting tubular portion disposed on the outer side, that is, the connecting tubular portion of the air duct, has the bead portion protruding toward the inner peripheral side. Since this bead part has a wall thickness approximately equal to that of the surrounding general part, the expansion near the projecting end of the bead part is caused by the recoverable bending of the bead part itself and the surrounding general part. It becomes possible relatively easily. Therefore, at the time of connecting the both connecting cylinders, by slightly expanding the vicinity of the projecting end of the bead portion in the connecting cylinder of the air duct, the connecting cylinder of the air duct is connected to the air blowing device. It is possible to smoothly exterior the tube portion.
Therefore, in the present connection structure, it is not necessary to apply an excessive insertion force (pushing force) to the air duct at the time of connecting the both connecting cylinders, and the construction is easy. Further, during the connecting work of both connecting cylinders, the general part of the air duct is not deformed unnecessarily.

Further, since the air duct does not need to be applied with an excessive pulling force even when the connecting cylinders in the connected state are separated from each other in order to perform maintenance or the like on the air blowing device or the air duct, the disconnecting work is not required. Workability is improved. Further, even during this detaching work, unnecessary deformation of the general portion of the air duct will not occur.

When a plurality of bead portions are arranged as described in claim 2, there are a plurality of sealing points between the connecting cylinder portions. Therefore, the sealing performance between the connecting cylinders can be further enhanced.

When the air duct is manufactured by blow molding as described in claim 3, even the air duct having the bead portion described above can be easily manufactured. In addition, since the air duct manufactured by blow molding can easily be made uniform in wall thickness and thinned, and the elasticity of the air duct can be increased, construction and maintenance of the present connection structure can be further facilitated. It can be carried out.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

In the first embodiment, as shown in FIGS. 1 to 3, the first and second air blowing devices 11 and 2 incorporated in an instrument panel (not shown) of a vehicle.
A connection structure configured by using 1 and the first and second air ducts 31 and 41 will be described.

The first air blowing device 11 is a side defroster mainly used to blow a warm air to a side window or the like in front of the vehicle to clear the glass constituting the side window or the like to secure a field of view. It is a nozzle.
The air blowing device 11 has a tubular shape with a substantially rectangular cross section, and a portion that is located on one opening side and has a straight shape is a connecting tubular portion 12. Further, in the air blowing device 11, a large number of fixed vertical blades 14 are provided inside the other opening 13 side.

The second air blowing device 21 is a side register nozzle (retainer) 21 that is mainly used for blowing hot air, cold air, or the like to perform air conditioning inside the vehicle. The air blowing device 21 also has a tubular shape with a substantially rectangular cross section, and a portion that is located on one opening side and has a straight shape is a connecting tubular portion 22. Further, in the air blowing device 21, a large number of vertical blades (not shown) and a large number of horizontal blades 25 are provided inside the other opening 23 side, and these blades use the operation knob 26. It can be rotated.

In the first embodiment, both air blowing devices 1
1.21 and the bezel 1 forming the design surface are integrally formed. That is, the bezel 1 has a bent plate shape, and includes an inclined portion 1c arranged above and a vertically extending portion 1d arranged below. Further, the opening 1a provided in the inclined portion 1c and the opening 13 of the first air blowing device 11 are integrated, and the opening 1b provided in the vertical portion 1d and the second air blowing device 21. Opening 23
And are integrated.

The connecting cylinders 12 and 22 of the air blowing devices 11 and 21 are manufactured by injection molding using a synthetic resin such as ABS and polypropylene, which is harder than the air ducts 31 and 41, as a constituent material together with the surrounding parts. Has been done.

The first air duct 31 is for blowing warm air or the like to the first air blowing device 11. The first air duct 31 is an integrally molded product made of synthetic resin such as polypropylene as a constituent material by blow molding, and has a substantially uniform thickness throughout. Thickness of the air duct 31 (about 1 mm in the case of the embodiment)
Is about 30 to 60% of the wall thickness (about 2 to 3 mm in the case of the embodiment) of the connecting tube portion 12 of the air blowing device 11, and is reduced. Therefore, the first air duct 3
1 has not only the constituent material but also a thinner wall thickness than that of the connecting cylinder portion 12 of the first air blowing device 11 so as to be rich in elasticity.

The air duct 31 has one end as a connecting part (not shown) connected to a blower source, and the other end connected to the connecting cylinder part 12 of the first air blowing device 11. The tubular portion 32 is provided, and the middle of these is provided as the duct body 33.

Further, in the first air duct 31,
As shown in FIGS. 2 and 3, the inner peripheral dimension of the duct main body 33 is substantially equal to the inner peripheral dimension of the connecting cylinder portion 12.
Further, the inner and outer circumferences of the connecting cylinder portion 32 are wider than the inner and outer circumferences of the duct body 33 in a stepwise manner from the rear end (step surface) 39, and the connecting cylinder portion 12 is inserted. The size is possible. In addition, the portion of the connecting tubular portion 32 near the opening end face 34 is such that the inner and outer circumferences of the portion are gradually enlarged toward the opening end face 34, and the opening end face 3 is formed.
Reference numeral 4 is an inclined surface corresponding to the inclined portion 1c of the bezel 1.

On the inner peripheral surface of the connecting cylinder portion 32, a bead portion 37 projects in a circular shape from the intermediate position along the axial direction of the connecting cylinder portion 32 in a circular shape. The bead portion 3 from the general portion 35 around the bead portion 37
The protrusion amount P of 7 is 3 to 5 mm (3 mm in the embodiment). The inner peripheral dimension H of the projecting end 37a of the bead portion 37 is equal to the outer peripheral dimension D of the connecting tubular portion 12 of the first air blowing device 11, or is 2 from the outer peripheral dimension D.
It is set to a small value within the range of mm. In the case of the embodiment, the inner peripheral dimension H is equal to the outer peripheral dimension D, and the clearance between the bead portion 37 and the connecting tubular portion 12 is zero.

As shown in FIG. 2, the bead portion 37 has a substantially semicircular cross section that bulges inwardly of the connecting tubular portion 32. Further, in the connecting tubular portion 32, the bead portion 37 and the surrounding general portion 35 have a substantially uniform wall thickness of about 1 mm.

The second air duct 41 is for blowing hot air or cold air to the second air blowing device 21. The second air duct 41 is also an integrally molded product produced by blow molding using a synthetic resin such as polypropylene as a constituent material, and has a substantially uniform thickness throughout. Further, the wall thickness of the second air duct 41 (about 1 mm in the case of the embodiment) is about 3 of the wall thickness of the connecting cylinder portion 22 of the air blowing device 21 (about 2-3 mm in the embodiment).
It is set to 0 to 60%, and the second air duct 41 has not only the constituent material but also a thinner wall thickness than that of the second air blowing device 21, so that the second air duct 41 has a rich elasticity.

The air duct 41 has one end as a connecting part (not shown) connected to a blower source and the other end,
The connecting cylinder portion 42 connected to the connecting cylinder portion 22 of the second air blowing device 21 is defined as the connecting cylinder portion 42, and the middle of these is formed as the duct body 4
3 is set.

Further, also in the second air duct 41, the inner peripheral dimension of the duct body 43 is made substantially equal to the inner peripheral dimension of the connecting cylinder portion 22. Further, the inner and outer circumferences of the connecting cylinder portion 42 are wider than the inner and outer circumferences of the duct main body 43 in a stepped manner, and the connecting cylinder portion 22 can be inserted. Further, the opening end surface 4 of the connecting tubular portion 42
The portion nearer to 4 is such that the inner and outer circumferences are gradually enlarged toward the opening end face 44, and
Is in a vertically extending state corresponding to the vertically extending portion 1d of the bezel 1. Then, on the inner peripheral surface of the connecting tubular portion 42, a bead portion 47 projects in a circular shape over the entire circumference from an intermediate position along the axial direction of the connecting tubular portion 42. This bead portion 47 also has a protrusion amount of 3 to 5 from the surrounding general portion 45.
mm (3 mm in the embodiment) and the protruding end 4 of the bead portion 47.
The second air blowing device 2 corresponding to the inner peripheral dimension of 7a
1 is equal to the outer peripheral dimension of the connecting tubular portion 22, or
It is set to be smaller than the outer peripheral dimension of the connecting cylinder portion 22 within a range of about 2 mm. In the case of the embodiment, the protruding end 4
The inner peripheral dimension of 7a is equal to the outer peripheral dimension of the connecting tubular portion 22, and the clearance between the bead portion 47 and the connecting tubular portion 22 is zero.

The bead portion 47 is also connected to the connecting cylinder portion 4.
2 has a substantially semicircular cross section that bulges inward. Also in the connecting cylinder portion 42, the bead portion 47 and the general portion 45 around the bead portion 47 have a substantially uniform wall thickness of about 1 mm.

Next, the construction example of this connection structure will be explained.
First, the first air blowing device 11 and the second air blowing device 21 that are integrated by the bezel 1 are mounted on the instrument panel of the vehicle. Then, push the instrument panel into place and press the
"Connecting work between the air blowing device 11 and the first air duct 31" and "Connecting work between the second air blowing device 21 and the second air duct 41" are performed.

At this time, since the portions of the connecting tubular portions 32, 42 close to the opening end faces 34, 44 have a divergent opening shape, both connecting tubular portions 12, 32 and both connecting tubular portions 22 ,.
The respective mutual alignment with 42 is carried out smoothly.

Then, when the pushing-in amount of the instrument panel is increased, the connecting cylinder portions 12 and 22 are moved to the bead portion 37.
It is inserted in the inner peripheral side of 47 in a sliding contact state. As a result, the bead portions 37 and 47 are brought into close contact with the outer peripheral surfaces of the connecting cylinder portions 12 and 22 by slightly expanding or restoring the inner peripheral dimension thereof. Since the bead portions 37 and 47 are smooth with a substantially semicircular cross section, the bead portion 37
The sliding contact between 47 and the outer peripheral surface of the connecting tubular portion 12, 22 and the “enlargement and restoration of the inner peripheral dimension of the bead portion 37, 47” accompanying this sliding contact are performed smoothly.

Then, when the pushing amount of the instrument panel reaches an appropriate amount, the pushing is stopped. As a result, the projecting ends 37a and 47a of the bead portions 37 and 47 are formed.
Are in close contact with the entire outer peripheral surfaces of the connecting cylinders 12 and 22, and the first air blowing device 11 and the first air duct 31
And the connection between the second air blowing device 21 and the second air duct 41 can be completed.

In the above connection structure, when the connection is completed, the projecting ends 37a and 47 of the bead portions 37 and 47 formed in a circular shape are formed.
a is a connecting tube portion 12 of the air blowing device 11/21.
The entire circumference of the outer peripheral surface of 22 is contacted. Therefore, the connection portion between the air blowing devices 11 and 21 and the air ducts 31 and 41 is uniformly sealed over the entire circumferential region around the shaft center of both the connecting cylinder portions 12 and 22, so that the connection portion The sealing performance can be reliably ensured.

Further, the projecting ends 37a of the bead portions 37 and 47 are
-47a comes into contact with the entire peripheral region of the outer peripheral surface of the connecting tubular portion 12, 22 of the air blowing device 11, 21,
There is no rattling, and both connecting cylinders 12, 22, 32
-The careless disconnection of 42 can be reliably prevented, and a stable connection state can be secured.

Further, in order to secure the sealing performance of the connecting portion between the air blowing device 11/21 and the air duct 31/41, a separate sealing member is interposed between both connecting cylinder portions 12, 22, 32/42. Since it is not necessary to do so, the labor and cost for constructing the connection structure can be reduced.

Further, in the present connecting structure, of the two connecting cylinder portions 12, 22, 32, 42 to be connected, the connecting cylinder portion arranged on the outer side, that is, the connecting cylinder portion of the air ducts 31, 41 is connected. Beads 37 and 47 on the inner surface of 32 and 42
Since the bead portions 37 and 47 have substantially the same thickness as the surrounding general portions 35 and 45, expansion of the bead portions 37 and 47 near the projecting ends 37a and 47a is prevented. This is possible relatively easily due to the restorable deflection of 47 itself and the general parts 35, 45 around it. Therefore, at the time of connecting the both connecting cylinders 12, 22, 32, 42, the connecting cylinders 32.4 of the air ducts 31, 41 are connected.
2 projecting ends 37a and 47 of the bead portions 37 and 47 in FIG.
By slightly expanding the vicinity of a, the connecting cylinder 32
-42 can be smoothly externally attached to the connecting cylinders 12 and 22. Therefore, in this connection structure, it is not necessary to apply an excessive insertion force (pushing force) to the air ducts 31 and 41 at the time of connecting the connecting cylinder portions 12, 22, 32, and 42, and the construction is easy. . Further, when connecting the both connecting cylinders, the general portion 35.4 of the air ducts 31 and 41 is connected.
It does not cause unnecessary deformation of 5.

Further, even when the connecting connecting tube portions 12, 22, 32, 42 are disconnected from each other in order to perform maintenance and the like on the air blowing devices 11, 21 and the air ducts 31, 41, the air duct 31 ,. Since it is not necessary to apply an excessive pulling force to 41, the workability of this detaching work is improved. Also, during this detaching work, the air duct 31
There is no useless deformation of the general parts 35 and 45 of 41.

Further, in this embodiment, the air duct 31
Since 41 is manufactured by blow molding, even the air ducts 31 and 41 including the bead portions 37 and 47 can be easily manufactured. In addition, the air ducts 31 and 41 produced by blow molding can easily have a uniform wall thickness and a thin wall thickness.
Since the elasticity of No. 1 can be enhanced, construction and maintenance of this connection structure can be easily performed from this point as well.

Further, in this connection structure, as shown in FIG. 2 and the like, the inner peripheral dimensions of the duct bodies 33 and 43 are corresponding to the connecting cylinder portions 12 and 22 of the air blowing devices 11 and 21.
The inner peripheral dimension of is approximately equal. That is, the inner peripheral surface of the duct main body 33/43 and the corresponding connecting tubular portion 12/2.
The inner peripheral surface of 2 is substantially flush with the axial direction of both. Therefore, it is possible to suppress the generation of an inappropriate air flow such as a vortex or a turbulent flow at the joint between the air ducts 31 and 41 and the air blowing devices 11 and 21.

The wall thickness of the air ducts 31 and 41 is less than 30% of the wall thickness of the corresponding connecting cylinders 12 and 22 (0.
If it is too thin (less than 5 mm), the air duct 31
-Bead portions 37 and 47 of 41 to be described later do not exhibit recoverable elasticity and may be plastically deformed. Further, the thickness of the air ducts 31 and 41 is equal to that of the connecting cylinder portions 12 and 22. When the thickness exceeds 60% (2 mm) and is too thick, the bead portions 37 and 47 are less likely to be elastically deformed, and the connecting work between the connecting cylinder portions 32 and 42 and the connecting cylinder portions 12 and 22 becomes difficult. The wall thickness of the air ducts 31 and 41 is 30 to 60% (0.5 to 2.0 m) of the wall thickness of the corresponding connecting tube portions 12 and 22.
It is desirable to be within the range of m).

In addition, the general portion 35 of the bead portion 37, 47
If the protrusion amount P from 45 is too small as less than 3 mm,
If the elastic deformation of the bead portions 37/47 cannot be sufficiently secured and the projection amount P is too large, exceeding 5 mm, the tip end surfaces of the connecting cylinder portions 12/22 will be caught by the bead portions 37/47 during connection work. Since the connection work may not be carried out smoothly, it is desirable that the protrusion amount P of the bead portion 37/47 from the general portion 35/45 be within the range of 3 to 5 mm.

Further, the projecting end 37 of the bead portion 37/47 is
If the inner peripheral dimension H of the a / 47a is larger than the outer peripheral dimension D of the connecting cylinder portion 12/22, air leakage occurs and the bead portion 3
If the inner peripheral dimension H of the projecting ends 37a, 47a of 7.47 is smaller than the outer peripheral dimension D of the connecting cylinder portion 12, 22 by 2 mm or more, the amount of deformation of the bead portions 37, 47 at the time of connection becomes large and the bead The protruding ends 37a and 47a are connected to the connecting cylinder 12.2.
Since it is strongly pressed against the outer peripheral surface of No. 2 and a great amount of force is required at the time of connection or withdrawal, the clearance between the inner peripheral dimension H and the outer peripheral dimension D may be within the range of 0 mm to -2 mm. desirable.

Next, the second embodiment will be described with reference to FIG. The connection structure of the second embodiment is similar to the connection structure of the first embodiment except for the following points.

That is, the air blowing device 51 is provided with the projections 55 that continuously or intermittently project in a circular shape over the entire outer peripheral surface of the connecting tubular portion 52. The protrusion 55 can be arranged between the bead portions 67 and 68, which will be described later, and has a gentle curved surface shape along the axial direction of the tubular portion 52.
The projecting height is also substantially equal to or slightly smaller than the projecting height of the bead portions 67 and 68 from the general portion 65. Even if the air blowing device 51 is a defroster nozzle type or a register nozzle type,
Other types may be used.

The air duct 61 has two bead portions 67 on the inner peripheral surface of the connecting tubular portion 62 along the axial direction of the tubular portion 62.
-68 is arranged and it is made by blow molding. These bead portions 67 and 68 are also included in the surrounding general portion 65.
And the wall thickness is almost equal. In the second embodiment as well, the rear end portion 6 is provided in the connecting tubular portion 62 of the air duct 61.
9 (step surface) is formed.

According to the connection structure of the second embodiment, the following effects can be obtained in addition to the effects of the connection structure of the first embodiment. That is, the two bead portions 67 and 68 are projected from the inner peripheral surface of the connecting cylinder portion 62 of the air duct 61, and the projecting ends 67a and 68a of the two bead portions 67 and 68 are connected to the connecting cylinder of the air blowing device 51. The portion 52 is in contact with the entire outer peripheral surface. That is, since there are two sealing points between the connecting tubular portions 52 and 62, the connecting tubular portions 52 and 6 are
The sealing performance between the two can be further enhanced.

Further, since the two bead portions 67 and 68 sandwich the both sides of the projection 55 along the axial direction of the tubular portion 52, the two connecting tubular portions 52 and 62 are inadvertently detached. Or relative insertion movement along the mutual mutual axial direction,
It can be surely prevented. By the way, since the protrusion 55 gently and slightly projects from the outer peripheral surface of the connecting cylinder 52, the connecting cylinder 62 is connected to the connecting cylinder 52.
It is not a big obstacle when pushing it to the side.

In the first embodiment, a specific example in which the present connection structure is applied to an integrated product of the defroster nozzle type air blowing device 11 and the register nozzle type air blowing device 21 has been described. The present connection structure can be suitably applied to a single item such as any one type of air blowing device. Moreover, the application symmetry of this connection structure is not limited to a vehicle. For example, it can be used as a “connection structure between an air blowing device in a building such as a house and an air duct”.

Further, as an application example of the present invention, there is provided a connection structure in which the connecting tubular portion of the air blowing device is externally mounted on the connecting tubular portion of the air duct, and the air blowing device and the air duct are connected. It can also be illustrated. In the connection structure according to this application example, a single or a plurality of circumferential bead portions are projected from the inner peripheral surface of the connection tube portion of the air blowing device, and the protruding end of the bead portion is connected to the air duct connection tube. It is also possible to make contact or pressure contact with the entire outer peripheral surface of the portion.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a connection structure according to a first embodiment.

FIG. 2 is a vertical cross-sectional view of the connection structure of the same embodiment.

FIG. 3 is a front view of an air duct forming the connection structure of the same embodiment.

FIG. 4 is a vertical sectional view of a connection structure according to a second embodiment.

FIG. 5 is a vertical cross-sectional view of a connection structure according to a conventional example.

FIG. 6 is a vertical cross-sectional view of a connection structure according to another conventional example.

FIG. 7 is a vertical cross-sectional view of a connection structure according to still another conventional example.

[Explanation of symbols]

11.21.51 ... Air blowing device, 12 ・ 22 ・ 52 ... Connection tube, 31, 41, 61 ... Air duct, 32, 42, 52 ... Connection tube, 35 ・ 45 ・ 65 ... General department, 37, 47, 67 ... Bead section, 37a, 47a, 67a ... Projecting end.

Continued front page    (72) Inventor Masato Yabushi             1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto             Car Co., Ltd. F-term (reference) 3H015 BA01 BB01                 3L080 AB02 AD01

Claims (3)

[Claims] 1. A connecting structure for connecting the air blowing device and the air duct by enclosing the connecting tubular part of the air duct with respect to the connecting tubular part of the air blowing device. A bead portion is formed on the inner peripheral surface of the portion so as to have a wall thickness substantially equal to that of the surrounding general portion so as to project in a circular shape over the entire circumference. A connection structure between an air blowing device and an air duct, characterized in that the connection is made by contacting the entire circumference of the outer peripheral surface of the connecting tubular portion. 2. The connection structure between an air blowing device and an air duct according to claim 1, wherein a plurality of the bead portions are arranged along an axial direction of a connecting cylinder portion of the air duct. . 3. The air duct is produced by blow molding, as claimed in claim 1 or 2.
The connection structure between the air blowing device and the air duct described in.