JP2010120468A - Back door mounting structure of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce twisting direction deformation by reversal phase input from the road surface and to reduce unpleasant vibration. <P>SOLUTION: In a back door mounting structure of a vehicle, a back door is made a dynamic damper and the twisting direction deformation by reversal phase input from the road surface is reduced by controlling a resonance point of an elastic body 5 which is interposed between a back door side hinge 1a and a body side hinge 1b in the upper part of the back door and making the back door side hinge 1a movable with respect to the body side hinge 1b in the vehicle width direction X, while making a vicinity of a floor that becomes the twisting center of the body the rotation center of a back door in the vehicle width direction X by a back door striker. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vehicle back door mounting structure.

  Vehicle bodies such as minivans and hatchbacks, which have a large space connected to the luggage room without a partition panel in the passenger compartment, have lower torsional rigidity than sedans, and reverse-phase input from the suspension (upside down on the left and right wheels) It is easy to twist by the force that enters in phase. This torsional resonance due to reverse-phase input from the road surface occurs in the vicinity of 20 to 25 Hz, and is felt as an unpleasant vibration phenomenon that is damped to the occupant and impairs the riding comfort performance.

  Here, it is necessary to increase the rigidity of the body in order to set the torsional resonance frequency to a high frequency band that does not feel a bull bull, but it is related to securing the indoor dimensions and fuel efficiency performance considering the usability of the vehicle. There is a contradiction to weight reduction, and the rigidity of the body cannot be secured.

On the other hand, the following Patent Document 1 discloses a vehicle caused by bending resonance of the body by appropriately setting the floor rigidity near the back door and the mounting rigidity of the back door with respect to the bending resonance frequency of the body of the wagon car. A technique for keeping the volume change of the chamber constant and reducing the muffled sound is disclosed.
JP 2002-225755 A

  However, since the technique described in the above publication actively uses the front door longitudinal deformation and the floor vertical deformation as a means of suppressing volume change of the passenger compartment, There is no effect of reducing deformation in the torsional direction of a certain vehicle body.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a back door mounting structure capable of reducing unpleasant vibration by reducing torsional direction deformation due to reverse phase input from a road surface. To do.

  The vehicle back door mounting structure according to the present invention is provided on the upper side of the back door and on the body side, and is provided on the body side with a back door side hinge and a body side hinge for supporting the back door to be opened and closed in the vertical direction. A back door striker having a loop portion that locks a locking device at the lower end portion of the back door when the back door is closed, and the back door striker has a loop portion with respect to the body side. The back door side hinge can be moved in the left and right direction via an elastic body on the body side hinge, and the back door can be rotated around the axis. It is characterized by controlling the resonance point of the elastic body as the center and making the back door a dynamic damper.

  According to such a vehicle back door mounting structure, the vicinity of the floor, which is the center of twisting of the body, is the center of rotation of the back door in the vehicle left-right direction by the back door striker, and the back door at the top of the back door The back door is made into a dynamic damper by controlling the resonance point of the elastic body that is interposed between the side hinge and the body side hinge and allows the back door side hinge to move in the left-right direction with respect to the body side hinge. Therefore, the deformation in the torsional direction due to the reverse phase input from the road surface is reduced, and unpleasant vibration can be reduced.

  Also, the vehicle back door mounting structure according to the present invention is provided on the back door and on the body side, respectively, and the back door side hinge and body side hinge for supporting the back door to be opened and closed in the vertical direction, and the body side The back door striker that locks the locking device at the lower end of the back door when the back door is closed and the back door both sides and body side are provided to prevent back door rattling when the back door is closed In the vehicle back door mounting structure having a back door side stopper and a body side stopper, the back door striker is movable in the vehicle left-right direction with respect to the body side, and the back door side hinge is The body side hinge is movable in the left-right direction via an elastic body, and the body-side stopper moves in the vehicle longitudinal direction with respect to the body side. Is rotatable in the vertical direction as heart, it is characterized in that the control back door the resonance point of the elastic body the axis as the pivot center of the back door and the dynamic dampers of.

  According to such a vehicle back door mounting structure, the position near the torsional center of the body and higher than the floor surface is the center of rotation of the back door in the vertical direction by the back door stopper, The back door striker is movable in the vehicle left-right direction with respect to the body side, and is interposed between the back door side hinge and the body side hinge at the upper part of the back door, and the back door side hinge is moved to the left and right with respect to the body side hinge. By controlling the resonance point of the elastic body that can move in the direction, the back door is made into a dynamic damper, so that deformation in the torsional direction due to reverse phase input from the road surface is reduced, and unpleasant vibration can be reduced.

  As described above, according to the present invention, deformation in the torsional direction due to reverse phase input from the road surface is reduced, and unpleasant vibration can be reduced.

  A preferred embodiment of a vehicle back door mounting structure according to the present invention will be described below with reference to FIGS. In each figure, the same symbol is attached to the same element, and duplicate explanation is omitted.

  FIGS. 1-9 is a figure regarding 1st embodiment of this invention, FIGS. 10-16 is a figure regarding 2nd embodiment of this invention, First, 1st embodiment is described.

  FIG. 1 is a rear view showing a vehicle provided with a back door mounting structure according to the first embodiment, FIG. 2 is a view showing a back door hinge of part A in FIG. 1, and FIGS. 3 and 4 are FIG. FIG. 5 is a diagram showing a C portion in FIG. 1, FIG. 6 is a diagram showing experimental results of body characteristics of a minivan according to the prior art, and FIG. 7 is a body diagram. FIG. 8 is a diagram illustrating the torsional deformation mode at the resonance frequency of FIG. 6, and FIG. 9 is a diagram illustrating the calculation results of the body characteristics, and is used here. The minivan is a general minivan with a high roof.

  As shown in FIGS. 1 to 4, the back door mounting structure 100 of this embodiment is characterized by the back door hinge 1 provided in the A part and the back door striker 2 provided in the B part. It is.

  The back door hinge 1 is for supporting the back door 3 so that it can be opened and closed in the vertical direction with its upper portion as a fulcrum. As shown in FIG. 1 and FIG. The back door side hinge 1a provided at a distance between the pair of back door side hinges 1a and the body side hinges 1b provided on the side of the body 4 corresponding to the pair of back door side hinges 1a is vertically moved via pins 1c. It is set as the structure supported so that rotation is possible.

  Particularly in the present embodiment, a gap in the left-right direction X is provided between the back door side hinge 1a and the body side hinge 1b, and this gap is coaxial with the pin 1c and elastically deformed. A pair of possible cylindrical elastic bushes (elastic bodies) 5 are arranged so as to be externally inserted into the pins 1c. With such a configuration, the back door side hinge 1a is movable in the left-right direction X via the elastic bush 5 with respect to the body side hinge 1b.

  As shown in FIGS. 3 and 4, the back door striker 2 has a lower end fixed to the back plate 4 a on the body 4 side, and a locking device (unlocked) of the lower end of the back door 3 is closed when the back door 3 is closed. And has a U-shaped loop portion 2a for locking the back door 3. The open side of the U-shaped loop portion 2a faces downward and extends in the front-rear direction. It is arranged.

  In particular, in the present embodiment, the loop portion 2a of the back door striker 2 is rotatable in the left-right direction X about the pin 2b disposed near the floor and extending in the vehicle front-rear direction (left-right direction X Can fall down).

  As described above, the back door side hinge 1a is movable in the left-right direction X by the elastic bush 5 with respect to the body side hinge 1b, and the loop portion 2a of the back door striker 2 extends in the vehicle front-rear direction. Since the extending pin 2b is pivotable in the left-right direction X, the back door 3 is pivotable in the left-right direction X about the pin 2b of the back door striker 2.

  In this embodiment, the characteristic of the elastic bush 5 is set to an appropriate value with respect to the mass of the back door 3, and the resonance frequency in the rotational direction of the back door 3 is matched with the torsional resonance frequency of the body 4. Yes. The reason why the resonance frequencies are adjusted in this way is that the back door 3 is also resonated at the torsional resonance frequency of the body 4, thereby making the back door 3 a dynamic damper.

  When traveling on rough roads, the upper portion of the back door 3 vibrates with a maximum amplitude of about 4 mm in the left-right direction X, so the clearance of the back door 3 with respect to the body 4 which is the clearance of C portion in FIG. Y (see FIG. 5) is enlarged from the current clearance of 5.2 mm to 7 mm to prevent interference with the body 4.

  Thus, in this embodiment, the vicinity of the floor is the center of rotation of the back door 3 in the vehicle left-right direction X by the back door striker 2, and the back door side hinge at the top of the back door 3 is used. By controlling the resonance point of the elastic bushing 5 that is interposed between 1a and the body side hinge 1b and allows the back door side hinge 1a to move in the left-right direction X with respect to the body side hinge 1b, the back door 3 Is a dynamic damper.

Here, the twist center position of the mini-bamboo body will be described with reference to FIG. FIG. 6 is experimental data of inertance showing the vibration characteristics of the mini-bamboo body with respect to the reverse phase input from the road surface in detail. The inertance is represented by an acceleration response (unit: m / s ² / N) to an input load, and is an easiness of movement with respect to the load, and thus can be considered as rigidity. This mini-bamboo body has a resonance point at 23 Hz, and has a characteristic of easily generating vibrations. And in the said minivan (a general minivan with a high roof), as shown in FIG. 8, from the state shown in FIG. 7, the position (slightly above the floor surface or the floor surface) near the center of gravity of the body. The body twists around. That is, the twist center position of the body is near the floor.

  Thus, although the twist center position of the mini-bamboo body is near the floor, in this embodiment, the vicinity of the floor, which is the twist center of the body 4, is the vehicle left-right direction of the back door 3 by the back door striker 2. The center is pivoted to X, and is interposed between the back door side hinge 1a and the body side hinge 1b at the top of the back door 3 so that the back door side hinge 1a is in the left-right direction X with respect to the body side hinge 1b. By controlling the resonance point of the elastic bushing 5 that can be moved, the back door 3 is made into a dynamic damper. That is, the back door striker 2 is used to move the back door 3 around the floor where the body 4 is twisted. In addition to being the center of rotation, the back door hinge 1 has a floating structure using an elastic bush 5 and is a dynamic damper. Because it is, the direction torsionally deformed by reverse phase input from the road surface is reduced, uncomfortable vibrations are reduced.

  It should be noted that the back door hinge 1 and the back door striker 2 need to be careful so that the back door 3 does not open in the event of a collision. In the present embodiment, the back door hinge 1 and the back door striker 2 The back door 3 can be prevented from being opened at the time of collision by being mechanically coupled to the supporting member and having a pin shape necessary for strength.

  FIG. 9 is a diagram showing the calculation results of the body characteristics according to the first embodiment (calculation results using the spring-mass model) together with the calculation results of the conventional sedans and minivans. In one embodiment, a minivan, a dotted line indicates a sedan, and an alternate long and short dash line indicates a conventional minivan.

  The sedan indicated by the dotted line weighs 1600 kg (front axle weight 800 kg, rear axle weight 800 kg), and the conventional minivan indicated by the alternate long and short dash line weighs 1500 kg (front axle weight 850 kg, rear axle weight 650 kg). The torsional rigidity is identified so as to be almost the same. As shown in FIG. 9, a conventional minivan indicated by a one-dot chain line with respect to a sedan indicated by a dotted line has a low resonance point, and has a peak in the vicinity of 20 Hz where the sensitivity of vibration that is bull is high.

  Here, the conventional minivan indicated by the one-dot chain line has a back door weight of 40 kg, and the result that the support rigidity by the elastic bush 5 of the back door hinge 1 is 270 N / mm is the result of the first embodiment indicated by the solid line. It is a minivan.

  In this minivan, as can be seen from FIG. 9, the inertance is reduced by about 2 to 3 dB (about 30%), and as a result, unpleasant vibration is reduced.

  By the way, in the first embodiment, an application to a general minivan with a high roof, that is, a vehicle whose torsional center is at a height near the center of gravity of the body (slightly above the floor surface or the floor surface) is described. However, in the following second embodiment, an application to a vehicle such as a minivan having a low overall height will be described.

  10 is a rear view showing a vehicle provided with the back door mounting structure according to the second embodiment, FIG. 11 is a view showing a body side stopper of a portion D in FIG. 10, and FIG. 12 is a view in FIG. The figure which shows the stopper by the side of the back door of D part, FIG. 13 is a figure which shows the state which stoppers are engaging, FIG.14 and FIG.15 is a figure which shows the backdoor striker of E part in FIG. FIG. 16 is a diagram showing the torsional deformation mode of the body at the resonance frequency of the low height minivan according to the prior art.

  As shown in FIGS. 10 to 15, the back door mounting structure 200 of the second embodiment is characterized by the back door stopper 6 provided in the D part and the back door striker 7 provided in the E part. It is what you have.

  The back door stopper 6 is for preventing the back door 3 from rattling when the back door 3 is closed. As shown in FIGS. 11 to 13, the back door stopper 6 is provided on each side of the back door 3. Body side stoppers 6a and 6a, which are respectively provided on the door side stoppers 6b and 6b and the body 4 side corresponding to the back door side stoppers 6b and 6b, and the back door side stoppers 6b and 6b engage with each other. And it is set as the structure which has.

  As shown in FIGS. 11 and 13, the lower stopper 6a of the body side is fixed to the body 4 side, and a cylindrical engaging portion 6c is provided on the upper portion thereof. The pin 6d that is positioned closer to the body 4 and extends in the vehicle front-rear direction is pivotable in the vertical direction.

  As shown in FIG. 12, the back door side stopper 6b is a concave engaging portion 6f that engages when the engaging portion 6c of the body side stopper 6a enters and fits into a rectangular parallelepiped main body 6e. It has.

  Accordingly, as shown by a solid line and a dotted line in FIG. 13, the body-side stopper 6a can be rotated in the vertical direction by the pin 6d whose axis is the vehicle front-rear direction relative to the body 4, and the body-side stopper 6a. In the state in which the back door side stopper 6b is engaged, the engaging portion can move in the rotational direction, so that the back door 3 can be moved up and down by the back door side stopper 6b. .

  As shown in FIGS. 14 and 15, the back door striker 7 has a lower end fixed to a back plate 4 a on the body 4 side, and the back plate 4 a is interposed via a bearing 8 disposed on the front side thereof. It is attached to the body 4 and is rotatable about the bearing 8 as an axis. That is, the back door striker 7 is movable in the left-right direction of the vehicle with respect to the body 4 side.

  The configuration of the back door hinge 1 is the same as that of the first embodiment, and the back door side hinge 1a moves in the left-right direction X via the elastic bush 5 for controlling the resonance point with respect to the body side hinge 1b. It is possible.

  Here, in the minivan having a low overall height, as shown in FIG. 16, the body is twisted as in the first embodiment, but the twist center is the floor surface or floor surface as in the first embodiment. It is not slightly above, but near the center of the body height, which is higher than the floor. This is due to the structure of the body, the mounting position of the suspension to be input, and the like. When the back door 3 is made into a dynamic damper with respect to the torsional deformation mode as shown in FIG. 16, the lower end portion of the back door close to the floor surface is pivoted by, for example, a back door striker as in the first embodiment. Then (when the center of gravity is shifted from the height of the center of gravity), vibration that has not occurred at the center of gravity is generated.

  However, in this second embodiment, the position near the torsion center of the body and higher than the floor surface is set as the center of rotation of the back door 3 in the vertical direction by the back door stopper 6, and the back The door striker 7 is movable in the vehicle left-right direction X with respect to the body 4 side, and is interposed between the back door side hinge 1a and the body side hinge 1b above the back door 3 so that the back door side hinge 1a is By controlling the resonance point of the elastic bushing 5 that is movable in the left-right direction X with respect to the body-side hinge 1b, the back door 3 is made into a dynamic damper, that is, a high twist center of the body 4 is high. The position (position higher than the floor surface) is set as the center of rotation of the back door 3 by the back door stopper 6 and the back door striker 7. Since it is a floating structure and the back door hinge 1 is a floating structure using an elastic bush 5 and is a dynamic damper, even if it is a vehicle such as a minivan with a low overall height, for example, reverse phase input from the road surface The deformation in the torsional direction due to can be efficiently reduced, and unpleasant vibration can be efficiently reduced.

  This second embodiment is particularly applicable when the amount of rotation of the back door 3 is small.

  As mentioned above, although this invention was concretely demonstrated based on the embodiment, this invention is not limited to the said embodiment.

1 is a schematic rear view showing a vehicle provided with a back door mounting structure according to a first embodiment of the present invention. It is a partial cross section rear view which shows the back door hinge provided in the A section in FIG. It is a partial cross section rear view which shows the back door striker provided in the B section in FIG. It is a longitudinal cross-sectional view of FIG. It is a figure which expands and shows the C section in FIG. It is a diagram which shows the experimental result of the body characteristic of the minivan which concerns on a prior art. It is a figure for demonstrating the torsional deformation mode of a body. It is a figure which shows the torsional deformation mode in the resonant frequency of FIG. It is a diagram which shows the calculation result of a body characteristic. It is a schematic rear view which shows the vehicle provided with the back door attachment structure which concerns on 2nd embodiment of this invention. It is a figure which shows the back door stopper provided in the D section in FIG. 10, and is a perspective view which shows the body side stopper. It is a figure which shows the back door stopper provided in the D section in FIG. 10, and is a perspective view which shows the stopper by the side of a back door. It is a figure which shows the state which the stoppers of FIG.11 and FIG.12 are engaging. It is a partial cross section rear view which shows the back door striker provided in the E section in FIG. It is a longitudinal cross-sectional view of FIG. It is a figure which shows the torsional deformation mode of the body in the resonant frequency of the low height minivan based on a prior art.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Back door hinge, 1a ... Back door side hinge, 1b ... Body side hinge, 2, 7 ... Back door striker, 2a ... Loop part, 2b ... Pin (Axis center of loop part; Center of rotation of back door), 3 ... back door, 5 ... elastic bush (elastic body), 6 ... back door stopper, 6a ... body side stopper, 6b ... back door side stopper, 6d ... pin (axis of the body side stopper; back door rotation) Center of movement), 100, 200 ... vehicle back door mounting structure, X ... vehicle left-right direction.

Claims (2)

A back door side hinge and a body side hinge for supporting the back door so that the back door can be opened and closed in a vertical direction, respectively, and provided on the body side, and when the back door is closed In a back door mounting structure for a vehicle having a back door striker with a loop portion that locks a locking tool at the lower end of the back door,
The back door striker is configured such that the loop portion can rotate in the vehicle left-right direction with the vehicle front-rear direction as an axis with respect to the body side,
The back door side hinge is movable in the left-right direction via an elastic body to the body side hinge,
A back door mounting structure for a vehicle, wherein the back door is made into a dynamic damper by controlling the resonance point of the elastic body with the axis as a rotation center of the back door. A back door side hinge and a body side hinge for supporting the back door so that the back door can be opened and closed in a vertical direction, respectively, and provided on the body side, and when the back door is closed A back door striker that locks a locking device at the lower end of the back door, and a back door side that is provided on both sides and the body side of the back door to prevent rattling of the back door when the back door is closed In a vehicle back door mounting structure having a stopper and a body-side stopper,
The back door striker is movable in the vehicle left-right direction with respect to the body side,
The back door side hinge is movable in the left-right direction via an elastic body to the body side hinge,
The body-side stopper is rotatable in the vertical direction with respect to the body side with the vehicle longitudinal direction as an axis.
A back door mounting structure for a vehicle, wherein the back door is made into a dynamic damper by controlling the resonance point of the elastic body with the axis as a rotation center of the back door.

Images