JP2003291645A - Structure of back door of vehicle - Google Patents

Structure of back door of vehicle

Info

Publication number
JP2003291645A
JP2003291645A JP2002102436A JP2002102436A JP2003291645A JP 2003291645 A JP2003291645 A JP 2003291645A JP 2002102436 A JP2002102436 A JP 2002102436A JP 2002102436 A JP2002102436 A JP 2002102436A JP 2003291645 A JP2003291645 A JP 2003291645A
Authority
JP
Japan
Prior art keywords
back door
elastic
vehicle
elastic stoppers
stoppers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2002102436A
Other languages
Japanese (ja)
Inventor
Hideki Ogiue
英樹 荻上
Original Assignee
Nissan Motor Co Ltd
日産自動車株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nissan Motor Co Ltd, 日産自動車株式会社 filed Critical Nissan Motor Co Ltd
Priority to JP2002102436A priority Critical patent/JP2003291645A/en
Publication of JP2003291645A publication Critical patent/JP2003291645A/en
Application status is Pending legal-status Critical

Links

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle backdoor structure capable of improving the efficiency of reducing a booming sound by vibrating a backdoor in a twisting mode, thereby canceling a volume change in a cabin on both sides of the backdoor. Plan. SOLUTION: Since natural frequencies of first and second elastic stoppers 20 and 21 provided on both sides of a free end of a back door 10 are made different from each other, vibration of a suspension or vibration of an engine or the like is transmitted. When the back door 10 vibrates,
These first and second elastic stoppers 2 having different natural frequencies
The back door 10 supported at 0 and 21 vibrates in a torsional mode, canceling out the change in the volume of the cabin on both sides of the free end of the back door 10 and effectively reducing the occurrence of the booming noise. can do.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back door structure for a vehicle, and more particularly to a vehicle having an elastic stopper provided between a back door and a vehicle body to cushion the vehicle. It relates to a back door structure. 2. Description of the Related Art A three-door or five-door vehicle is provided with a back door for opening and closing a vehicle body opening on the rear side of the vehicle, and the back door is buffered by an elastic stopper with the vehicle body. I have to. [0003] There are two types of back doors: a lateral side edge is attached to the vehicle body by a hinge member and is opened and closed laterally, and an upper edge is mounted to the vehicle body by a hinge member and is opened and closed vertically. For example, in the case of the latter open / close type back door, the elastic stoppers are attached to the left and right sides of the inner surface of the cabin at the lower end, which is the free end of the back door. Are pressed against the periphery of the vehicle body opening with a cushioning function. [0004] By the way, when vibrations during traveling of a vehicle on an uneven road surface or other vibrations of an engine or the like are transmitted to the vehicle body, the back door vibrates. The vibration of the back door is a pendulum vibration in the front-rear direction (primary vibration of the back door) centered on the upper edge mounting portion. Strictly speaking, the vibration of the pendulum changes the volume of the cabin, which is This can cause muffled sounds inside. [0006] For this reason, conventionally, in order to cope with the muffled sound caused by the back-and-forth vibration of the back door, the support structure of the back door is strengthened. Measures have been taken to reduce the amplitude of the longitudinal vibration of the back door by, for example, increasing the reaction force of the weather strip or the reaction force of the door lock for maintaining the closed state of the back door. [0007] However, in the conventional back door structure, the same elastic stoppers are used on both the left and right sides, and the vibration modes of these elastic stoppers have the same phase on the left and right sides. Therefore, the back door vibrates back and forth in synchronization with the left and right elastic stopper portions, that is, while maintaining a state parallel to the vehicle width direction. For this reason, if the amplitude is simply reduced by strengthening the support structure, a change in the volume of the cabin due to the back-and-forth vibration of the back door still occurs, and the muffled sound cannot be sufficiently removed. Further, if the reaction force of the weather strip or the reaction force of the door lock is increased to reduce the amplitude, the closing performance of the back door deteriorates. Therefore, the present invention provides a backdoor structure for a vehicle in which the change in volume in the cabin is canceled out on both sides of the backdoor by vibrating the backdoor in a twisting mode, thereby improving the efficiency of reducing the booming noise. Is provided. According to the present invention, both sides of a free end of a back door which can be opened and closed around one side edge, and a vehicle body opening to which the back door is mounted are provided. In a back door structure of a vehicle, wherein first and second elastic stoppers are disposed in a direction perpendicular to the opening and closing direction of the back door between the first and second elastic stoppers, the natural frequency of the first and second elastic stoppers is It is characterized by being different from each other. According to a second aspect of the present invention, in the vehicle back door structure according to the first aspect, the natural frequency of the first and second elastic stoppers is such that each of the elastic stoppers has a closing force of the back door. It is characterized in that the phases of the respective vibrations are set to be opposite phases at least in a frequency region where the muffled sound is generated in a state where the vibrations are applied. According to a third aspect of the present invention, in the back door structure for a vehicle according to the first or second aspect, the natural frequencies of the first and second elastic stoppers are adjusted by changing the rigidity of each of the elastic stoppers. It is characterized by being performed. According to a fourth aspect of the present invention, in the vehicle back door structure according to the third aspect, the rigidity of the first and second elastic stoppers is reduced by the size of the cavity formed inside each of the elastic stoppers. It is characterized by being adjusted and changed. According to the invention of claim 5, claims 1 to 4 are provided.
Wherein the first and second elastic stoppers have substantially the same size as an existing elastic stopper. According to the first aspect of the present invention, the first,
Since the natural frequencies of the second elastic stoppers are different from each other, when the vibration during traveling or the vibration of the engine or the like is transmitted and the back door vibrates, the natural frequencies are supported by the first and second elastic stoppers having different natural frequencies. The backdoor vibrates in a twisting mode, and the change in the volume of the cabin can be canceled effectively on both sides of the free end of the backdoor, effectively reducing the occurrence of booming noise. Can be. According to the invention described in claim 2, according to claim 1
In addition to the effects of the invention, the vibrations of the first and second elastic stoppers have opposite phases at least in the frequency region where the muffled sound is generated. As a result, the change in cabin volume can be accurately canceled out on both sides of the free end of the back door,
Generation of muffled sound can be effectively prevented. According to the third aspect of the present invention, in addition to the effects of the first and second aspects of the present invention, the natural frequencies of the first and second elastic stoppers are adjusted by changing the rigidity. Can be simplified. According to the invention described in claim 4, according to claim 3,
In addition to the effect of the invention, the rigidity of the first and second elastic stoppers is adjusted and changed by the size of the internal cavity, so that the outer shape and size of each elastic stopper are the same, and the natural frequency of each is accurately determined. Can be adjusted well. According to the invention described in claim 5, according to claim 1,
In addition to the effects of the fourth to fourth aspects of the present invention, the first and second elastic stoppers have substantially the same size as the existing elastic stopper, so that the back door and the vehicle body structure are not changed, and
It is possible to take measures against the muffled sound without increasing the weight. Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 7 show an embodiment of a back door structure of a vehicle according to the present invention. FIG. 1 is a perspective view schematically showing a vehicle having a back door, and FIG. 2 is a rear perspective view of the back door. FIGS. 3 and 3 are side views of the back door, FIG. 4 is an enlarged perspective view of the elastic stopper, FIG. 5A is an enlarged sectional view of the first elastic stopper, and FIG. 5B is an enlarged sectional view of the second elastic stopper. FIG. 6 is an excitation point response diagram showing the phase and response level of the elastic stopper, FIG. 7A is a perspective view illustrating the vibration mode of the back door of the present embodiment, and FIG. It is a perspective view explaining the vibration mode of a back door. As shown in FIG. 1, the vehicle 1 of the present embodiment includes a back door 10, which is substantially rectangular as shown in FIG. 2, and whose upper edge 10a has a door hinge (not shown). Is mounted on the upper edge of the vehicle body opening 1a (see FIG. 1) at the rear of the vehicle, and is a flip-up type that opens and closes vertically with the lower end of the back door 10 as a free end. On the inner side 10b of the back door 10 facing the cabin C side, first and second lower corners 10c and 10d, which are perpendicular to the opening and closing direction of the back door 10, are provided.
The second elastic stoppers 20 and 21 are attached, and the back door 1
When closed, the elastic stoppers 20 and 21 abut the left and right corners of the lower edge of the vehicle body opening 1a with a cushioning function. At this time, a weather strip (not shown) provided on the peripheral edge of the back door 10 is in close contact with the peripheral edge of the vehicle body opening 1a, and the closed state of the back door 10 is engaged by the engagement of a door lock (not shown). It can be held. The first and second elastic stoppers 20, 21
Includes elastic bodies 20a, 21a formed of rubber or the like as shown in FIG. 4 and base parts 20b, 21b to which the elastic bodies 20a, 21a are attached. Facing the cabin C and the base 2
0b and 21b are mounted at predetermined positions on the back door 10, and the outer shapes and sizes of the elastic stoppers 20 and 21, that is, the elastic members 20a and 21a and the base portions 20b and 21b have the same outer shape and size, respectively. It is formed in. Here, in this embodiment, as shown in FIG. 5, hollow portions 20c, 21c are formed inside the elastic bodies 20a, 21a of the first and second elastic stoppers 20, 21, respectively.
By changing the size of the hollow portions 20c and 21c, the rigidity of each of the elastic stoppers 20 and 21 is changed, and the natural frequency of each is adjusted. That is, FIG. 5A shows the first elastic stopper 2
FIG. 2B shows the second elastic stopper 2
1, the cavity 20c of the first elastic stopper 20 is formed larger than the cavity 21c of the second elastic stopper 21 so that the natural frequencies of the elastic stoppers 20 and 21 are different. The first and second elastic stoppers 20, 21
In the state where the closing force of the back door 10 is applied to each of the elastic stoppers 20 and 21, that is, when the back door 10 is closed, the natural frequency of the respective vibrations as shown in FIG. The natural frequency of the first elastic stopper 20 is adjusted to αHz, and the natural frequency of the second elastic stopper 21 is adjusted to βHz, for example, by adjusting the natural frequency of the first elastic stopper 20 to αHz. is there. FIG.
The solid line indicates the characteristic P of the first stopper 20, and the broken line indicates the characteristic Q of the second stopper 21. Although the natural frequencies of the first and second elastic stoppers 20 and 21 are adjusted to be different from each other, the elastic stoppers 20 and 21 have substantially the same size as the existing elastic stoppers. It has been formed. With the above structure, in the vehicle back door structure of the present embodiment, as shown in FIG. 1, when the vehicle 1 travels on an uneven road surface R, vibration from a suspension (not shown) is input to the vehicle body. When the engine vibration is input to the vehicle body, the vehicle body vibration is transmitted to the first and second elastic stoppers 20 and 2.
1 and the back door 10 are vibrated. At this time, the first and second elastic stoppers 2
Since the natural frequencies of 0 and 21 are different from each other, FIG.
When a vibration force F acts on each of the elastic stoppers 20 and 21 from the vehicle body as shown in FIG.
The back door 10 supported by the elastic stoppers 2
Since the phases of 0 and 21 are different, they vibrate in a twisting mode as shown in FIG. As shown in FIG. 7B, in the conventional case, the right and left elastic stoppers m and n have the same natural frequency, so that the back door D vibrates in the parallel mode. Therefore, in the back door structure of the present embodiment, the change in the volume of the cabin C of the vehicle 1 caused by the vibration of the back door 10 effectively cancels out the left and right sides of the back door 10 vibrating in the twisting mode. Since the noise can be reduced, generation of the muffled sound can be suppressed efficiently. In particular, in the present embodiment, as shown in FIG. 6A, the vibrations of the first and second elastic stoppers 20 and 21 are set to have opposite phases at least in the frequency region where the muffled sound is generated. Therefore, as shown in FIG. 6B, in the frequency region where the muffled sound is generated, the response levels are completely opposite, and the vibration directions of the left and right sides of the back door 10 supported by the elastic stoppers 20 and 21 are opposite. For this reason, since the change in the volume of the cabin C can be accurately canceled between the left and right sides of the back door 10, the generation of a muffled sound can be effectively prevented. In this embodiment, since the natural frequencies of the first and second elastic stoppers 20 and 21 are adjusted by changing the rigidity, the structure of each of the elastic stoppers 20 and 21 can be simplified. The change in the rigidity is determined by the elastic bodies 20a, 2
Since the size is determined by the size of the hollow portions 20c and 21c inside 1a, the natural frequency of each of the elastic stoppers 20 and 21 can be adjusted with high accuracy. Further, the first and second elastic stoppers 20 and 2
Since 1 is substantially the same size as the existing (conventional) elastic stopper, it is possible to take measures against the muffled sound without changing the back door 10 or the vehicle body structure and without increasing the weight. The backdoor structure of the vehicle according to the present invention has been described by taking the above embodiment as an example. However, the present invention is not limited to this, and various embodiments can be adopted without departing from the gist of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view schematically showing a vehicle provided with a back door according to an embodiment of the present invention. FIG. 2 is a rear perspective view of a back door according to the embodiment of the present invention. FIG. 3 is a side view of the back door according to the embodiment of the present invention. FIG. 4 is an enlarged perspective view of an elastic stopper according to the embodiment of the present invention. 5A is an enlarged sectional view of a first elastic stopper, and FIG. 5B is an enlarged sectional view of a second elastic stopper according to the embodiment of the present invention. FIG. 6 is an excitation point response diagram showing a phase and a response level of an elastic stopper according to the embodiment of the present invention. FIG. 7A is a perspective view illustrating a vibration mode of a back door according to the present embodiment, and FIG. 7B is a perspective view illustrating a vibration mode of a conventional back door. DESCRIPTION OF SYMBOLS 1a Body opening 10 Back door 10a Upper edge (one side edge) 20 First elastic stopper 21 Second elastic stopper 20a, 21a Elastic body 20c, 21c Cavity

Claims (1)

  1. Claims: 1. A back door is provided between a free end of the back door which can be opened and closed about one side edge and a vehicle body opening edge on which the back door is mounted. In a back door structure for a vehicle having first and second elastic stoppers arranged in a direction perpendicular to the opening and closing direction, the natural frequencies of the first and second elastic stoppers are different from each other. Back door structure. 2. The natural frequency of each of the first and second elastic stoppers is determined in such a manner that, when a closing force of the back door is applied to each of the elastic stoppers, the phase of each vibration is at least a cause of generation of muffled sound. The vehicle backdoor structure according to claim 1, wherein the reverse phase is set in (1). 3. The vehicle back door structure according to claim 1, wherein the natural frequency of the first and second elastic stoppers is adjusted by changing the rigidity of each of the elastic stoppers. 4. The vehicle backdoor according to claim 3, wherein the rigidity of the first and second elastic stoppers is adjusted and changed by the size of a cavity formed inside each of the elastic stoppers. Construction. 5. The back door structure for a vehicle according to claim 1, wherein the first and second elastic stoppers have substantially the same size as an existing elastic stopper.
JP2002102436A 2002-04-04 2002-04-04 Structure of back door of vehicle Pending JP2003291645A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002102436A JP2003291645A (en) 2002-04-04 2002-04-04 Structure of back door of vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002102436A JP2003291645A (en) 2002-04-04 2002-04-04 Structure of back door of vehicle

Publications (1)

Publication Number Publication Date
JP2003291645A true JP2003291645A (en) 2003-10-15

Family

ID=29242250

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2002102436A Pending JP2003291645A (en) 2002-04-04 2002-04-04 Structure of back door of vehicle

Country Status (1)

Country Link
JP (1) JP2003291645A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011058658A1 (en) 2009-11-16 2011-05-19 トヨタ自動車株式会社 Top-hinged door structure
JP2012131375A (en) * 2010-12-21 2012-07-12 Daihatsu Motor Co Ltd Back door device of vehicle

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011058658A1 (en) 2009-11-16 2011-05-19 トヨタ自動車株式会社 Top-hinged door structure
JP5152404B2 (en) * 2009-11-16 2013-02-27 トヨタ自動車株式会社 Upper hinge door structure
EP2644815A1 (en) 2009-11-16 2013-10-02 Toyota Jidosha Kabushiki Kaisha Top-hinged door structure
US8746777B2 (en) 2009-11-16 2014-06-10 Toyota Jidosha Kabushiki Kaisha Top-hinged door structure
CN102365185B (en) * 2009-11-16 2014-07-09 丰田自动车株式会社 Top-hinged door structure
JP2012131375A (en) * 2010-12-21 2012-07-12 Daihatsu Motor Co Ltd Back door device of vehicle

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