JP2003260935A - Back door structure of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a novel back door of a vehicle able to be opened/closed in small spaces, and capable of reducing booming noise. <P>SOLUTION: The back door of a vehicle comprises a vehicle body 20 having a trim 6 underneath a roof 4, a rail 5 laid along both side edges of the vehicle rear part, a shutter 1 having a plurality of panels 1a arranged to be bellows-like style, a roller 2 provided on both sides of the shutter 1 slidably fitted to the rail 5, a lock 3 connected to the lower part of the vehicle body 20 when the shutter 1 is closed, a wire 9 for winding the shutter 1, and a motor 10 for driving the wire 9. The shutter 1 is opened and closed in the vertical direction along the rail 5 by the winding wire 9 and winded and stored between the roof 4 and the trim 6. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back door structure for a vehicle in which muffled noise is reduced and the door can be opened and closed in a small space.

[0002]

2. Description of the Related Art A conventional backdoor structure provided on a vehicle body of a wagon, a minivan or the like is generally a vertically opened type as shown in FIG. 6 or a horizontally opened door type backdoor structure as shown in FIG. Target. It should be noted that FIG. 7 particularly shows a double-door type back door. However, in any type of backdoor structure, when opening the backdoor, a wide space is required in the rear or left-right direction. Therefore, opening and closing the back door requires safety confirmation and a large space. Further, the door-type backdoor structure has a problem that a muffled sound is likely to be generated.

The problem when the back door shown in FIGS. 6 and 7 is opened will be further described. FIG. 6 is a diagram showing the disadvantages of the conventional vertically opening back door structure. Reference numeral 30 denotes a vehicle body having a vertically opened back door 31 and shows a state in which the vertically opened back door 31 is opened. Reference numeral 32 is an obstacle such as a wall of a building. As can be seen from the figure, if the rear of the vehicle body 30 is narrow,
There is a problem that the vertically opened back door 31 cannot be opened sufficiently or that it is difficult to load and unload luggage and passengers cannot get on and off.

FIG. 7 is a view showing the disadvantages of the conventional double door backdoor structure. 33 is a top view of a vehicle body having a double-door double door 34.
4 shows a state in which 4 is opened. In this door structure, a space is provided in the lateral direction of the vehicle.
When a motorcycle or a bicycle 36 is passing through, the double door 34 is an obstacle for passage. Further, for example, in the case of a welfare vehicle or an ambulance vehicle, when the occupant 37 using a wheelchair gets on or off, or when the injured person is put on or taken off from a stretcher, the passenger may get back and forth when opening or closing the double door 34. Is bothersome and inconvenient.
Incidentally, regardless of the type of door, in the conventional door type back door, it is possible that the back door will open vigorously when the wind is strong.

Next, the mist noise caused by the conventional door type back door structure will be described. FIG. 8: is a figure explaining the mechanism by which a muffled sound is generated by the conventional door type backdoor structure. In FIG. 8A, reference numeral 30 is a vehicle body having a vertical opening type back door 31. When the vehicle body 30 travels on the road surface 41, resonance 43 occurs in the rear suspension of the wheels 42 due to the vibration from the road surface 41 (see FIG. 8B). Due to the resonance 43, the primary resonance (pendulum vibration) 44 of the back door 31 is excited, and the air in the vehicle interior is repeatedly compressed and expanded to cause a volume change, which may cause a muffled sound 45.

The muffled sound 45 caused by the pendulum vibration 44 at the front and rear of the longitudinally openable back door 31 causes discomfort due to the pressure on the eardrum of an occupant in the vehicle. In the case of welfare vehicles and ambulance vehicles, this phenomenon is not particularly desirable.

FIG. 9 is a schematic view showing a pendulum vibration 44 of the vertically opening type back door 31. The vertical open type door door 31
Two hinges 46 connect the upper part of the vehicle body.
When the longitudinally openable back door 31 is closed, the lock 47 connects the vehicle body 30. In this case, vibration in the front and rear of the vertically opening type back door 31 causes the air in the vehicle interior to repeatedly compress and expand to cause a volume change, which causes the central portion of the door fixed by the hinge 46 and the lock 47 to move. It swells and causes pendulum vibration 44. Although the vertical opening type back door has been described above as an example, a muffled sound is generated due to the same mechanism even in the horizontal opening type and the double door type opening door.

When the vibration analysis of the vehicle body was conducted, it was found that the muffled sound 45 occurred because the resonance frequency 43 of the rear suspension and the resonance frequency of the pendulum vibration 44 of the back door were likely to be close to each other. It is structurally difficult to reduce muffled noise in a door-type back door. As described above, the conventional back door structure cannot solve the following problems. (1) It is difficult to open and close the back door in a narrow place. (2) Due to the structure, muffled noise cannot be reduced.

[0009]

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a novel back door structure for a vehicle, and a shutter having excellent convenience especially for welfare vehicles and emergency vehicles. A backdoor structure is provided.

[0010]

In order to solve the above problems, the present invention has the following configuration. That is, in the vehicle back door structure according to claim 1, the back door of the vehicle body is configured by a shutter formed by combining a plurality of panels in a bellows shape, and the shutter is opened and closed by sliding the shutter up and down. It is characterized by having done.

According to another aspect of the present invention, there is provided a back door structure for a vehicle, wherein a trim body is arranged at a lower portion of a roof, a rail laid along both side edges of a rear portion of the car body, and a plurality of panels are combined in a bellows shape. A shutter, a rotating roller that is provided on both sides of the shutter and that can be fitted and slid on the rail, a lock that is connected to the lower portion of the vehicle body when the shutter is closed, and a wire that winds the shutter. A motor for driving a wire, and the shutter is opened and closed vertically along the rail by the winding wire, and when the shutter is opened, the shutter is wound and accommodated between the roof and the trim. It is characterized by that.

According to a third aspect of the present invention, stoppers are provided at both ends of a panel forming the shutter at the central portion of the shutter, and the central portion of the shutter is fixed to the vehicle body by the stopper when the shutter is closed. It is characterized by that.

The operation of the invention described in claims 1 and 2 is as follows. With the back door structure of the vehicle configured as described above, the back door can be opened and closed even in a narrow place by using the back door as a shutter. Therefore, it is possible to easily open and close the back door without taking space in the vehicle rearward or width direction as in the conventional case. Further, according to the present invention, it is possible to significantly reduce the operation noise when the back door is opened and closed. Further, since the restraint points between the shutter and the vehicle body are significantly increased as compared with the conventional door type back door, the muffled sound can be significantly reduced. As a result, the discomfort felt by passengers in the vehicle can be significantly reduced.

According to the third aspect of the present invention, one of the panels of the shutter of the back door is provided in the central portion with stoppers at both ends thereof, so that when the shutter of the back door is closed, two shutters are provided. The stopper can be inserted into the car body like a lock pin. Therefore, by restraining one of the central panels forming the shutter of the back door to the vehicle body with the stopper, the pendulum vibration directions of the upper and lower parts of the back door can be reversed. Due to the action of canceling the vibration of the upper and lower parts of the back door, the vibration of the back door can be almost eliminated. Therefore, according to this structure, the muffled sound due to the pressure change in the vehicle interior due to the vibration of the back door can be significantly reduced or eliminated.

According to the present invention having these configurations, it is possible to open and close the back door even in a narrow space by using the shutter and the electrification of the back door, and it is possible to significantly reduce the operation noise of the back door when opening and closing. Therefore, the discomfort felt by the person in the vehicle is reduced. Further, by using a shutter system for the back door, it is possible to significantly reduce muffled noise.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a vehicle backdoor structure suitable for, for example, a welfare vehicle or an emergency vehicle according to an embodiment of the present invention. FIG. 1 shows an overall structure of a vehicle body 20 such as a welfare vehicle or an ambulance vehicle according to the present invention. In a rear portion of a vehicle body such as a wagon vehicle or a minivan having a relatively high vehicle height, that is, a roof, a vertically long portion is formed from a roof to an upper portion of a back bumper. The back door 15 is arranged in a shutter manner so that it can be opened and closed vertically. This back door 15
The main structure of the shutter 1 is a shutter 1 composed of a plurality of panels made in a bellows shape with a material that does not easily vibrate. Each panel 1a constituting this shutter 1 is formed of a horizontally long plate extending over both side edges that define the vehicle width in the rear part of the vehicle, and adjacent panels 1a can be bent or folded to each other in a known manner. It is composed by being connected to.

In the present embodiment, the rotary rollers 2 are arranged at the left and right ends of each panel 1a constituting the shutter 1. Further, a lock 3 for connecting to the vehicle body 20 is provided on the lowermost panel 1a, and when the shutter 1 is closed, the lock 1 restrains the shutter 1 and the vehicle body 20.

Further, a pair of rails 5 is laid downward along the left and right edges from the left and right rear ends of the roof 4 of the vehicle body 20 to the vicinity of the rear bumper. The rotating roller 2 of the shutter 1 is fitted on the pair of rails 5 and moves on the rails 5, whereby the shutter 1 is opened and closed. In order to open and close the shutter 1 quietly, it is preferable that the rotary roller 2 be made of a resin with low noise.

FIG. 2 shows a roof structure of a vehicle body 20 composed of a wagon vehicle, a minivan and the like. This figure is a schematic partial cross-sectional view in the I-I direction of FIG. As shown in the figure, a trim 6 is arranged in the vehicle compartment at the lower part of the roof 4, and these ends are opened as a shutter opening 7 in a slender shape in the width direction of the vehicle. You can do it. A hole 8 formed between the roof 4 and the trim 6 communicates with the front of the vehicle through the opening 7, and the shutter 1 is accommodated therein when the shutter is opened.

Now, the drive mechanism of the shutter 1 will be described with reference to FIG. This shutter 1 is opened and closed by electric drive. In the figure, the upper end of the shutter 1 is connected to a wire 9, and the wire 9 is connected to a shaft 10a of a motor 10 arranged inside and inside a hole 8 formed between the roof 4 and the trim 6. Has been done. In this way, for example, an open / close switch (not shown) arranged near the driver's seat is turned on to rotate the motor 10 to wind up or wind out the wire 9, and drive the motor to move the shutter 1 to the rail 5. Can be opened and closed along. Here, by rotating the motor 10 in the normal direction and winding the wire 9, the shutter 1 is wound up and the back door is opened, and by rotating the motor 10 in the reverse direction to unwind the wire 9, the shutter 1 is released. It is pulled down and the open back door is closed.

A door opening / closing switch (not shown) is attached to the vehicle body 2.
If it is installed not only on the inner side of 0 but also on the outer side of the vehicle body 20, for example, near the back door, the user of the wheelchair or an ambulance or the like can open and close the back door 15 by electrically driving. That is, for example, the user of the wheelchair can safely perform the work of “opening the back door → boarding the car → closing the back door while boarding”.

According to this structure, the back door 15 of the vehicle of the present invention is opened and closed along the rear end of the vehicle to form a shutter, so that the back door 15 is electrified by the motor 10 even in a narrow place. Can be opened and closed. Further, it is possible to significantly reduce the operation sound when the back door 15 is opened and closed, and the discomfort felt by a person in the vehicle is reduced. Further, the shutter 1 when the back door is closed
The restraint between the vehicle body 20 and the vehicle body 20 is performed by the lock 3 at the center of the lower end of the shutter 1 and the rotating rollers 2 on both sides of the shutter 1. Therefore, the number of restraint points is significantly increased as compared with the conventional door type back door structure. As a result, the muffled sound 45 caused by the vibration of the back door 15 can be significantly reduced.

Next, a measure for substantially reducing or eliminating the muffled sound of the back door structure 15 will be described with reference to FIGS. 4 and 5. FIG. 4 is an external view of the vehicle seen from the rear. In the central or substantially central part of the bellows-shaped panel 1a of the shutter 1 which constitutes the back door 15, both ends of the shutter 11 are provided with new stoppers 11 instead of the rotary roller 2.
Is provided. The other reference numerals that are the same as those shown in FIG. 1 indicate the same members or portions as those shown in FIG.

FIG. 5 shows the details of the stopper 11. In the figure, a stopper 11 is provided on one central bellows panel of the shutter 1. The figure shows this stopper 11
3 is an external view of one side of FIG. The stoppers 11 have a columnar shape, and are incorporated at both ends of one panel 1a constituting the shutter 1 via springs 12. This stopper 11 is provided for the spring 1 when the shutter 1 is closed.
It is configured to be inserted and fixed like a lock pin into the rail 5 of the vehicle body 20 with a pressing force of 2. The stopper 11 is preferably made of rubber or hard resin.

According to this structure, the vehicle body 20 is provided with the two stoppers 11 which are attached to the left and right of the central portion of the shutter 1.
Since it is fixed to the back door 15, the vibration directions of the upper part and the lower part of the back door 15 can be reversed.
Due to the action of canceling the pendulum vibration, the pressure change in the room of the vehicle body 20 can be made zero. The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the invention described in the claims, and it goes without saying that they are also included in the scope of the present invention. For example, in the above-mentioned embodiment, the description was given mainly of an example in which the back door structure of the present invention is applied to a welfare vehicle, an ambulance vehicle, etc., but the vehicle to which the back door structure of the present invention can be applied is not limited to this. Of course, it can be applied to any type of commercial vehicle or passenger vehicle.

[0026]

As can be understood from the above description, since the back door structure of the present invention is configured as a shutter system so that it can be slid up and down to open and close, the back door can be opened and closed even in a narrow space, and the back door can be opened and closed. By using a shutter and electrification, it is possible to significantly reduce the operating noise during opening and closing. In addition, the new backdoor structure makes it possible to significantly reduce or eliminate muffled noise.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a vehicle back door structure according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a roof structure taken along the line II of FIG.

FIG. 3 is a schematic view showing a drive mechanism of a shutter 1.

FIG. 4 is an external view of the vehicle seen from the rear.

FIG. 5 is a diagram showing details of a stopper.

FIG. 6 is a side view showing a conventional vertical opening type back door structure.

FIG. 7 is a plan view showing a conventional double door type back door structure.

[Fig. 8] The muffled sound due to the conventional door type back door structure,
It is a figure explaining the mechanism which arises.

FIG. 9 is a schematic diagram showing a pendulum vibration 44 of the vertically opened back door 31.

[Explanation of symbols]

1 shutter 1a Each panel 2 rollers 3 lock 4 roof 5 rails 6 trim 7 openings 8 holes 9 wires 10 motors 10a motor rotating shaft 11 stopper 12 spring 15 Backdoor structure 20 car body

Claims (3)

[Claims] 1. A back door of a vehicle body comprises a shutter formed by combining a plurality of panels in a bellows shape, and the shutter is opened and closed by sliding the shutter up and down.
Vehicle back door structure. 2. A vehicle body in which a trim is arranged on a lower portion of a roof, rails laid along both side edges of a rear portion of the vehicle body, and a shutter formed by combining a plurality of panels in a bellows shape.
Rotating rollers that are provided on both sides of the shutter and that can fit and slide on the rails, a lock that connects to the lower part of the vehicle body when the shutter is closed, a wire that winds up the shutter, and a motor that drives the wire. And the shutter is opened and closed in the vertical direction along the rail by the winding wire, and the shutter is wound and accommodated between the roof and the trim when the shutter is opened. , Vehicle backdoor structure. 3. A shutter is provided at both ends of a panel forming the shutter at a central portion of the shutter, and the central portion of the shutter is fixed to the vehicle body by the stopper when the shutter is closed. Claim 1
Or the vehicle back door structure according to 2.