JP2002036861A - Ventilation duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ventilation duct capable of suppressing noise due to repeated opening/closing of a flap with a very low cost and improving ventilating performance. SOLUTION: This ventilation duct is provided with a frame body 1 forming an opening O for discharging interior air to the outside of a vehicle and a flexible plate type flap 1 arranged so as to close the opening O by its self-weight on the vehicle outside of the frame body 1 and opened only in the outward direction by an air pressure difference between the inside and the outside of a vehicle cabin or a wind pressure. The ventilation duct is also provided with a rib 11 integrally formed in the frame body 1 for partitioning the opening O in grid form and a projection part 21 arranged on the flap face side facing the opening O and abutting on the middle position of the rib 11 when the opening O is closed by the flap 2. When the flap 2 closes the opening O, the flap 2 abuts on the opening outer circumferential edge 12, while the flap part around the projection part 21 is lifted from the rib 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation duct which secures a ventilation volume in a vehicle compartment while the vehicle is running, and prevents foreign matter, exhaust gas and the like from entering the vehicle compartment when the vehicle is stopped.

[0002]

2. Description of the Related Art At the rear of an automobile, there is a ventilation duct for replacing the air in the cabin during traveling. The relatively narrow cabin is easily contaminated and fogged by human breathing, cigarette smoke, etc., so fresh air is taken in from the front of the cabin and discharged out of the vehicle through the opening of the ventilation duct provided in the rear of the car. . A flap 8 is attached to the frame 7 serving as a ventilation duct main body that forms the opening, and during running, the flap 8 changes its opening degree according to the pressure difference between the inside and outside of the vehicle to adjust the air volume. (FIG. 8). Also, the flap 8
It functions as a valve element of a check valve, and covers the opening O when the vehicle is stopped or the like, and plays a role of preventing foreign substances (dust, dust, etc.) from entering the vehicle interior from the outside. Furthermore, when opening a window while driving,
When the vehicle interior pressure becomes lower than the external pressure, the flap 8 is opened.
To prevent exhaust inhalation. Such a ventilation duct is mounted on the back of an automobile bumper or the like.

However, the conventional ventilation duct has a problem that the flap 8 makes a rattling sound when the door is closed. When the door is closed, the door is opened by the internal pressure as shown by α in FIG. 8 and then closed by its own weight as shown by β in FIG. , Α → β → α → β... Were repeatedly opened and closed two or three times. The noise has begun to become a problem as the noise of the vehicle is reduced. For example, the following has been proposed as such a measure. (1) As shown in FIG. 9, an abnormal noise preventing material 9 such as a nonwoven fabric or flocking is attached to the seal portion. (2) As shown in FIG. 10, a curved portion 71 which is curved in a convex shape is formed on the frame body 7, and when the flap 8 covers the opening, it does not come into contact simultaneously with the entire surface, but comes into contact gradually from both sides toward the center. Try to close. (3) The thickness of the flap 8 is increased (the mass per unit area is increased) so that the door does not repeatedly open and close when the door is closed.

[0004]

However, the above (1)
The cost increase was unavoidable when the abnormal noise prevention material 9 was installed. In (2), the flap 8 is usually formed by punching a sheet into a predetermined shape. However, when fixing the flap 8 to the frame body 7, the opening and closing function of the flap 8 must be taken into consideration. In such a case, the frame 7 which is convexly curved
When the flap 8 is attached to the frame 7, the wrinkle was always generated somewhere, and a gap portion where the flap 8 could not contact the opening edge of the frame 7 was formed. The increase in the weight of the flap 8 in (3) not only increased the cost but also led to the deterioration of the ventilation performance.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and it is possible to suppress the repeated flap opening / closing noise at a little cost and to reduce the noise level itself at one time, and further improve the ventilation performance. The purpose is to provide a duct.

[0006]

In order to achieve the above object,
The gist of the invention according to claim 1 is that a frame having an opening for discharging the air in the vehicle interior to the outside of the vehicle, and the opening is provided on the outside of the frame so as to cover the opening by its own weight. A flexible plate-like flap that opens only in the direction of the outside of the vehicle due to a pressure difference or wind pressure; a ventilation duct that is formed integrally with the frame and partitions the opening into a lattice shape; A convex portion provided on the opposite flap surface side, which hits the middle point of the rib when the opening is closed by the flap, wherein the flap comes into contact with the outer peripheral edge of the opening when the flap closes the opening, The flap part around the part is in a state of being lifted from the rib in the ventilation duct. According to a second aspect of the present invention, in the ventilation duct of the first aspect, the thickness of the raised portion of the convex portion is smaller than the thickness of the general portion of the flap. The gist of the invention according to claim 3 is that a frame having an opening for discharging the air in the vehicle interior to the outside of the vehicle, and the opening is provided on the outside of the frame with a lid to cover the opening by its own weight. A flexible plate-like flap that opens only in the direction of the outside of the vehicle due to a pressure difference or wind pressure, wherein a rib for partitioning the opening in a lattice shape is formed integrally with the frame, and A small projection is formed at the intermediate point to protrude to the outside of the vehicle, and when the flap closes the opening, the flap abuts on the outer peripheral edge of the opening, while the small projection abuts on the flap facing surface, so that the flap portion around the small projection becomes A ventilation duct is characterized in that it is raised from a rib.

According to the first and third aspects of the present invention, when the projection or the small projection is formed, when the flap closes the opening, the flap portion around the projection or the small projection rises from the rib. The sound when the lid is closed with the flap is lower than that of the conventional product that hit the entire flap. When the flexible flap closes the opening, the convex or small projection first hits and the flap is deformed to absorb the impact, so the repulsive force when the flap closes the opening is the convex or small projection. Smaller than when there is no As a result, repetition of opening and closing of the flap is reduced. As in the invention of claim 2, when the thickness of the raised portion of the convex portion is made smaller than the thickness of the general flap portion, the convex portion is more easily deformed than the general flap portion, so that shock absorption is performed smoothly. The flap closing sound and repulsion are further reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The ventilation duct of the present invention will be described below in detail. (1) Embodiment 1 FIGS. 1 to 3 show an embodiment of a ventilation duct according to the present invention.
FIG. 1 is an exploded front view, FIG. 2 is a longitudinal sectional view of a ventilation duct, and FIG. 3 is a view taken along line GG of FIG.

The ventilation duct of this embodiment includes a frame 1, a flap 2, a rib 11, and a projection 21. The frame 1 which is a main part of the ventilation duct (vehicle ventilation device) is a frame body 1
This is a resin molded product including a, a flange 1b, and a rib 11. The ventilation duct here is attached to a rear quarter panel of a vehicle, and is also called a quarter vent duct or the like. A flange 1b is formed integrally with an outer peripheral edge of a rectangular cylindrical frame body 1a having an opening O at the center. The frame main body 1a is formed into a rectangular frame by an inclined frame, an upper frame and a lower frame, forms an opening O for discharging the air inside the vehicle to the outside of the vehicle, and has a ∠-shaped inclined surface in which a flap 2 is placed outside the vehicle. (FIG. 2).

The rib 11 is formed integrally with the frame 1 so that its outer surface is flush with the inclined surface. The ribs 11 partition the openings O in a grid pattern. The rib 11 here is composed of three vertical bars 11a and four horizontal bars 11b in a symmetrical manner as shown in FIG. 1, but is not limited to this. In addition, only vertical rail 11a or horizontal rail 1
Even if only 1b is used, it is assumed that the openings O in the present invention are partitioned in a lattice shape. Opening O of the vertical Z _a × horizontal L _a by the formation of the ribs 11 is partitioned into eight. The rib 11 is the frame 1
In addition to the role of reinforcement, the flap 2 serves as a wall that prevents the flap 2 from passing through the opening O and dropping into the vehicle interior. Symbol 15
Is a pin used to attach the upper edge portion of the flap 2, reference numeral 18 is an eave portion that projects horizontally from the upper edge of the upper frame to the outside of the vehicle, and reference numeral 19 is a drain portion.

The flap 2 (also called an on-off valve)
A plate-like thin butterfly made of flexible rubber or synthetic resin and made slightly larger than the opening O,
1 is integrally formed. The relationship between the flap size and opening size is made vertical _Z b> _{Z a,} a lateral _L b> _{L a.} The flap 2 is made of, for example, ethylene propylene diene copolymer rubber (JISA hardness is 50 degrees). The flap 2 is provided on the outside of the frame 1 so that the opening O can be closed by its own weight, and is opened only in the direction of the outside of the vehicle due to a pressure difference or wind pressure inside and outside the vehicle. Here, the flap 2 is mounted on the vehicle-side inclined surface of the frame 1, and the pin 15 is passed through a through hole 23 provided near the upper edge of the flap 2, and then the locking portion F is formed by heat caulking 151. I do. When the upper edge portion of the flap 2 is locked to the frame 1 by the locking portion F, the flap 2 hangs down by its own weight and covers the opening O in a normal state. When the vehicle interior pressure becomes higher than the vehicle exterior pressure during traveling of the vehicle or the like, the entire flap 2 tilts with the locking portion F as a fulcrum and floats up from the opening O (see FIG. 8), and the vehicle moves from the vehicle interior to the exterior of the vehicle interior. Ventilation will be performed. The flap 2 functions as a valve body of a check valve that opens only in the direction O from the passenger compartment side to the outside of the vehicle. Note that the method of using the heat caulking 151 for the locking portion F is an example, and the flap 2 normally closes the opening O by its own weight, and if the air pressure in the vehicle interior becomes higher than the air pressure outside the vehicle, other methods are used. It may depend on the method. For example, there is a method in which an insertion hole is provided in the upper portion of the frame 1, an engagement protrusion formed on the upper edge of the flap 2 is inserted into the insertion hole, and the flap 2 is suspended from the frame 1 and attached.

The flap 2 is provided with a convex portion 21 at a central portion excluding a peripheral edge on a surface side facing the opening O. In this embodiment, six convex portions 21 are provided as shown.
When the opening O is closed by the flap 2, the convex portion 21 hits an intermediate point of the rib 11 (vertical bar 11 a). When the flap 2 is closed, two convex portions 21 abut on each of the three vertical bars 11a, and the contact points of the two convex portions 21 are intermediate points at which the length of each vertical bar 11a is substantially divided into three. Distributed to. When the flap 2 closes the opening O, the flap 2 comes into contact with the outer peripheral edge 12 of the opening and tightly seals it. On the other hand, the flap 2 is soft and the periphery of the convex portion 21 in contact with the rib 11 rises. That is, the flap 2 is flexible, and the flap portion around the convex portion 21 rises from the rib 11, and a space S is formed between the flap 2 around the convex portion 21 and the rib 11. Due to the formation of the empty space S, the flap 2 is recessed in the center at the outside of the vehicle, and has a shape as if a sail is stretched, so that the flap 2 easily receives the wind pressure on the passenger compartment side.

The role expected of the flap 2 is to smoothly release the pressure inside the vehicle to the outside of the vehicle and to prevent dust, exhaust gas, rainwater, etc. outside the vehicle from entering the vehicle.
Focusing on the fact that when the flap 2 closes the opening O, the flap 2 does not need to be in contact with all of the ribs 11 if the flap 2 can seal against the periphery of the opening O to prevent dust and the like outside the vehicle from entering the vehicle interior. This has led to the present invention. In the present invention, the rib 11
A convex portion 21 is provided on the flap 2 to be grounded to reduce the ground contact area. The convex portion 21 is made of a soft material such as rubber of the same material as the flap body, so that when the flap 2 closes, it is difficult to generate abnormal noise. 21 is formed integrally with the flap body 2a,
In order to avoid the manufacturing cost required for this, even if the projection 21 is formed, when the flap 2 closes the opening O, the height of the projection is set such that the flap 2 is tightly sealed around the opening O. A structural means effective for countermeasures against noise accompanying opening and closing of the flap 2 is employed. The size of the convex portion 21 is about 3 mm in diameter in terms of specific dimensions, and the height from the flap general portion 2a is about 1 mm.

The projection 21 is, for example, as shown in FIG.
A projection that projects in a cylindrical shape from the flap surface side toward the opening O
However, rather than having a circular top surface 213 as shown in FIG.
As shown in Fig. 3 (b), R type with roundness 211 at the tip
More preferably, it is in a shape. Flap hitting rib 11
2. Can the noise be reduced by reducing the ground contact surface?
It is. In addition, as shown in FIG.
Thickness t of component 212 ₂Is the thickness t of the flap general portion 2a.
₁Making it smaller also results in excellent noise suppression. Takashi
The flap 2 is formed by thinning the raised portion 212.
The resilient force is deformed and absorbed by the ridge-forming portion 212, and as shown in FIG.
Stop flap 2 opening and closing over and over
Because you can do it. Fig. 3 (c) shows a thin ridge
The raised portion 212 is only a cylindrical portion, and the circular top surface 213 is thin.
Not formed, but a protruding portion in which the entire convex portion 21 is thinned
The minute 212 may be used. The shapes of the projections 21 are all the same.
However, there is no need for unification. For example, in the center of flap 2
Raise the height of the convex portion 21 located at the periphery of the flap 2
The height of the protrusion 21 at a position close to the height can be reduced.
When the flap 2 is closed by such a configuration, the flap 2
The center of the car is more concave, making it easier to receive wind pressure on the passenger compartment side.
Become. At the same time, the flap 2 is closely adhered to the outer peripheral edge 12 of the opening.
Configuration that makes it easier to seal
Be certain. When the flap 2 is manufactured by injection molding,
As shown in FIG. 2, the front side (car) of the flap 2 having the convex portion 21
Outer surface) is stealing to avoid post-shrinkage due to thick wall
It is preferred to have 22 concave shapes.

(2) Embodiment 2 This embodiment is a ventilation duct as shown in FIGS. 4 and 5, which is a modification of the first embodiment. 4 is a longitudinal sectional view corresponding to FIG. 2, and FIG. 5 is a partial front view of the ventilation duct. Rib 1
The front view 1 has the same shape as that of the first embodiment, but the side view is such that the ribs 11 are thick and reinforced as shown in FIG. The flap 2 has only one convex portion 21 provided at the center thereof. When the opening O is closed by the flap 2, the flap 2 abuts on the outer peripheral edge 12 of the opening to seal the opening O, while the projection 21 hits the middle point of the middle vertical bar 11 a having three projections 21 and the periphery of the projection 21. Flap 2 part is rib 11
To create a void S. The other configuration is the same as that of the first embodiment, and the description is omitted. The same reference numerals as those in the first embodiment denote the same or corresponding parts.

(3) Third Embodiment In the first and second embodiments, the convex portion 21 is formed on the flap 2. However, in the present embodiment, the small protrusion 13 is provided on the rib 11 instead of the convex portion 21 as shown in FIGS. Form. A rib 11 for partitioning the opening O in a lattice shape is formed integrally with the frame 1, and a small projection 13 is formed at an intermediate point of the rib 11 to protrude to the outside of the vehicle. The shape of the rib 11 in the front view and the side view is the second embodiment.
However, a small protrusion 13 is formed at the middle point of the middle vertical bar 11a of the three vertical bars 11a of the rib 11 so as to project outward. The size of the small projections 13 is
It is almost the same size as The small protrusions 13 may be provided on the ribs 11 afterwards. Since the flap 2 is made of a flexible material such as rubber, when the flap 2 closes the opening O, the flap 2 comes into contact with the outer peripheral edge 12 of the opening, while the small projection 13 abuts on the surface facing the flap 2. As a result, the flap 2 around the small projection 13
To form a space S between the rib 11 and the rib 11. The number of the small projections 13 is not limited to one but may be plural on the rib 11. When a plurality of small projections 13 are provided, their shapes can be different. When the height of the small projections 13 near the center of the opening O is increased and the small projections 13 near the periphery of the opening are lowered, the vicinity of the center of the flap 2 becomes more concave, so that it becomes easier to receive wind pressure on the vehicle compartment side, and the opening O This is advantageous because it is easy to ensure the close sealing of the outer peripheral edge 12 of the flap to the peripheral edge.

(4) Effect The ventilation duct constructed as described above is extremely significant because it can be manufactured with little cost on the projection 21 or the small projection 13 and can prevent noise. If there is the convex portion 21 or the small projection 13, the opening O
Is closed, the flap 2 and the rib 1 are formed by forming the space S while the flap 2 is in contact with and sealed to the outer peripheral edge 12 of the opening.
The noise level itself can be reduced by reducing the overall contact area corresponding to 1. And the convex part 2
When the flap 2 is provided, when the flap 2 shifts from the open state to the closed state, since the surrounding flap 2 including the convex portion 21 is made of a flexible material, the flap 2 absorbs deformation and absorbs impact. Since the opening O is covered, the repulsive force applied to the flap 2 is reduced. As a result, α → as shown in FIG.
β → α → β..., the repetitive operation of opening and closing disappears, and the flap 2 no longer rattles. In particular, when the thickness of the raised portion 212 of the convex portion 21 is set smaller than the thickness of the flap general portion 2a, this portion tends to be concentratedly deformed, so that the lid function of contacting and sealing the outer peripheral edge 12 of the opening of the flap 2 is provided. , The impact of closing the lid can be further reduced, and noise countermeasures can be enhanced. In addition, the small protrusion 13
When the flexible flap 2 is closed, the flap portion facing the small projection 13 first comes into contact when the flexible flap 2 is closed, so that the area around the flap portion is deformed and concentrated to absorb the impact. It is. As a result, the resilience of the flap 2 is weakened, and the repeated opening and closing operations of the flap 2 are reduced. In the case where the small projections 13 are formed, there is a disadvantage that the flap portion corresponding to the small projections 13 is liable to be damaged by repeated use. On the other hand, if the portion is thickened, the absorbing power of the impact is weakened. It is more preferred to do so.

Furthermore, the central portion of the flap 2 is recessed to the outside of the vehicle and the sail is stretched in a state in which the flap 2 is closed by the height of the projection 21 or the small projection 13 at the intermediate point of the rib 11. Because it is in the form, it becomes easier to catch the wind pressure on the passenger compartment side, which leads to improved ventilation performance. The flap 2 opens when the vehicle interior pressure becomes higher than the external pressure. Even if the pressure difference is relatively small, the flap 2 receives the wind pressure and the opening O
Get away from it.

It should be noted that the present invention is not limited to the embodiment described above, but can be variously modified within the scope of the present invention depending on the purpose and application. The shape, size, number, material, and the like of the frame 1, the rib 11, the small protrusion 13, the flap 2, and the protrusion 21 can be appropriately selected according to the application.

[0020]

As described above, the ventilation duct of the present invention is inexpensive, reduces the noise level when the lid is closed,
In addition, it suppresses repeated flap opening / closing noises, and achieves excellent effects such as improving ventilation performance.

[Brief description of the drawings]

FIG. 1 is an exploded front view of a ventilation duct according to a first embodiment.

FIG. 2 is a longitudinal sectional view of the ventilation duct of FIG. 1;

FIG. 3 is a view taken along line gg of FIG. 1;

FIG. 4 is a longitudinal sectional view of a ventilation duct according to a second embodiment.

FIG. 5 is a partial front view of the ventilation duct of FIG. 4;

FIG. 6 is a vertical sectional view of a ventilation duct according to a third embodiment.

FIG. 7 is a partial front view of the ventilation duct of FIG. 6;

FIG. 8 is an explanatory longitudinal sectional view of a conventional ventilation duct.

FIG. 9 is an explanatory longitudinal sectional view of a frame according to a conventional ventilation duct.

FIG. 10 is an explanatory perspective view of a conventional ventilation duct.

[Explanation of symbols]

1 frame 11 rib 12 open outer circumferential edge 13 small projections 2 flaps 2a flap general portion (the flap body) 21 protrusions O opening t _{1, t 2} thickness

Claims (3)

[Claims] 1. A frame having an opening for discharging air inside the vehicle to the outside of the vehicle, and the opening is provided on the outside of the frame so as to cover the opening by its own weight. A ventilation flap comprising: a flexible plate-like flap that opens only in an outward direction; and a rib integrally formed on the frame and partitioning the opening in a grid pattern, and a flap surface facing the opening. A convex portion that is provided at the intermediate point of the rib when the opening is closed by a flap, and the flap contacts the opening outer peripheral edge when the flap closes the opening, while the flap portion around the convex portion is A ventilation duct characterized by being raised from the rib. 2. The ventilation duct according to claim 1, wherein the thickness of the raised portion of the projection is smaller than the thickness of the general flap portion. 3. A frame having an opening for discharging air inside the vehicle to the outside of the vehicle, and the opening is provided on the outside of the frame so as to cover the opening by its own weight. A flexible plate-like flap that opens only in the outward direction, wherein a rib that partitions the opening in a lattice shape is formed integrally with the frame body, and further, at an intermediate point between the ribs and toward the outside of the vehicle. A projecting small projection is formed, and when the flap closes the opening, the flap comes into contact with the outer peripheral edge of the opening, while the small projection abuts against the flap facing surface, so that the flap portion around the small projection rises from the rib. A ventilation duct characterized by the following.