Title of I~~ve~ition
TRANSPORTATION VEI-IICLE PART AND PANEL MEMBER THEREFOR
5
Technical Field
[OOOl]
The present invention relates to a transportation vehicle part for attenuating
noise and vibration and a panel member therefor.
10
Backgrouud Art
[0002]
In transportation vehicles such as automobiles, railroad vehicles, vessels,
and aircrafts, noise and vibration are generated due to various kinds of factors.
15 [0003]
For example, an engine or a motor that is an auto~nobile power source
generates noise and vibration while the engine or the motor is being driven. In
addition, while an automobile travels, noise auld vibration are generated in the
vehicle body by an uneven road surface or tlie like. If such noise and vibration are
20 directly transmitted into the vehicle body (cabin), occupants in tlie vehicle may be
uncomfortable.
[0004]
In view of this, techniques for suppressing such noise and vibration have
been developed heretofore, For example, Patent Literature 1 discloses an asphalt
25 sheet. The asphalt sheet of Patent Literature 1 may be used by being affixed on a
floor panel of a vehicle as a nleasure against vibration and noise in the vehicle. , ,
[OOOS]
In other cases, for example, Patent Literature 2 and Patent Literature 3
respectively disclose a soulld attenuating patch. The sound atte~luating patch of
30 each of Patent Literature 2 and Patent Literature 3 may be affixed on a main panel
via an adhesive layer and attenuates noise and vibration.
Citation List
Patent Literature
[0006]
5 Patent Literature 1:
Patent Literature 2:
Patent Literature 3:
10 Tecl~nicaPl roblem
[0007]
In a case of using an asphalt sheet as disclosed in Patent Literature 1, tlie
effect for suppressing noise and vibration can be recognized. However, the
thickness of the asphalt sheet itself is 3 to 6 nlm and is great. Therefore, for
15 example, when the asphalt sheet is affixed on a dash panel, a floor panel, and the like
in an automobile, the interior space of the automobile is undesirably decreased. In
addition, since the asphalt sheet has a relatively large weight, when the asphalt sheet
is affixed, the weight of the automobile is undesirably greatly increased.
[OOOS]
20 On the other hand, in each of Patent Literature 2 and Patent Literature 3, a
sheet-like metal member is used as the sound attenuating patch. However,
according to a result of ail intensive research that was conducted by the inventors of
the present invention, there may be cases in which noise and vibration are not
sufficiently suppressed by merely affixing the sheet-like member on a dash panel and
25 the like in an automobile. Specifically, for example, the rigidity of the dash panel
cannot be sufficiently inlproved by merely affixing the sheet-like mepber on the
dash panel. In addition, the sheet-like member does not have a vibration attenuating
function. Therefore, the vibration characteristic of tlie dash panel is not improved,
and there may be cases in which noise and vibration camlot be sufficier~tly
30 suppressed with regard to the dash panel.
[0009]
The present invention has been achieved in order to solve such problems,
and an object of tl~cp resent invention is to provide a transportation vehicle part
which has a superior vibration characteristic without greatly increasing the thickness
and the weight of the transportation vehicle part and is to provide a panel menlber for
5 improving the vibration characteristic of the transportation vehicle part without
greatly increasing the thickness and the weight of the transportation vehicle part.
Solution to Problem
[OOl 01
10 The inventors of the present invention conducted an intensive research in
order to inlprove a vibration characteristic of a transportation vehicle part while the
thickness of the transportation vehicle part is not greatly increased.
[OOll]
As a result, it was found that the structure of a panel member, which is a
15 material of a transportation vehicle part, is important. That is, by constructing a
panel member of a nletal base plate and a patch nlenlber which is formed of a
vibration attenuating resin layer and a patch panel, and by affixing the patch member
on the base plate while the vibration attenuating resin layer of the patch member is
closely contacted with the base plate, vibration can be attenuated by heat that is
20 generated by deformation of the vibration attenuating resin layer.
Moreover, it wvas found that it is important to perform spot wvelding on the
base plate and the patch member beforehand. More specifically, in a transportation
vehicle part which is produced by deforming a panel member, by i~nproving the
rigidity of the portion \vhich is deformed (hereinafter called a worked portion), the
25 vibration characteristic of the transportation vehicle part is improved. In addition,
by perfornling the spot wvelding on a main body and the patch member beforehand at
a portion of the panel member to be deformed (hereinafter called a working
scheduled portion), the rigidity of the \vorked portion of the transpostatiotx vehicle
part is sufficiently improved. Accordingly, by performing the spot welding on the
30 mait1 body and the patch member beforehand at the working scheduled portion, the
rigidity of the worked portion is sufficiently improved by using the patch member
having a snlall thickness, whereby the vibration characteristic of the transportation
vehicle part is improved.
[0012]
The present i~lventionh as been colnpleted based on the above findings, and
5 the present i ~ ~ e n t i oprno vides a transportation vehicle part and a panel n~embera s
described below.
[0013]
(1)
A transpo~tation vehicle part including:
10 a patch member constructed of a plate-like metal patch panel, and a
vibration atte~luatingre sin layer provided along a surface of the patch panel; and
a metal base plate closely adl~eredw ith the vibration attenuating resin layer
of the patch me~llbear nd affixed with the patch member.
(2)
15 The transportation vehicle part according to (I), wherein the patch panel and
the base plate are welded together at at least one part of tlle patch panel and the base
plate.
(3)
The transportation vehicle part according to (1) or (2), mherein the
20 transportation vel~iclep art illcludes a ridged portion, and the patch panel and the base
plate are welded together at at least one part of the ridged portion.
(4)
Tlie transportation vehicle part according to any one of (1) to (3), wherein
the transportation vehicle part is provided with a rigidity reinforced portion which
25 has an uneven shape.
(5) -
The transportation vehicle part according to any one of (1) to (4), \*'herein
the vibration attenuating resin layer is an electrically conductive.
(6)
30 The transportation vehicle part according to any one of (1) to (S), wherein
the patch panel has a thickness of not less than 0.3 nlm and not greater than a
thickness of the base plate.
(7)
The transportation vehicle part according to any one of (1) to (6), \vI~erein
the vibration attenuating resin layer has a thickness of not less than 10 Inn and not
5 greater than 1000 pm.
(8)
The transportation vehicle part according to any one of (1) to (7), wherein
the vibration attenuating resin layer is constructed of ~nultiple layers which have
different temperature characteristics with each other.
10 (9)
The transportation vehicle part according to (8), wherein a panel is inserted
bet\veen the multiple layers.
(10)
The trat~sportationv ehicle part according to any one of (1) to (9), wherein
15 at1 uneven surface processing is performed on a surface of the patch panel or a
surface of the base plate, which contacts the vibration attenuating resin layer.
(11)
A panel member including:
. a patch member constructed of a plate -like metal patch panel, and a
20 vibration attenuating resin layer provided along a surface of the patch panel; and
a metal base plate closely adhered with the vibration attenuating resin layer
of the patch member and affixed with the patch member.
Advantageous Effects of Invention
25 [0014]
According to the present invention, a transportation vehicle part which has a
superior vibration characteristic is provided without greatly increasing the thickness
and the weight of the trat~spo~-tatiovne hicle part, and a panel member for improving
tlie vibration characteristic of the transpoltation vehicle part without greatly
30 increasing the thickness and the weight of the transportation vehicle part is also
provided.
Brief Description of Drawings
[00 151
[FIG. 11 FIG. 1 is an external perspective view of a panel member according to an
5 enibodiment of the present invention.
[FIG. 21 FIG. 2 is an external perspective view of a dash panel according to an
emboditiient of the present invention.
[FIG. 3A] FIG. 3A illustrates an exaalnple of a metliod for producing a panel member.
[FIG. 3B] FIG. 3B illustrates an exaniple of a method for producing a panel member.
10 [FIG. 4AJ FIG. 4A illustrates an example of a method for producing a panel tnenlber
and a dash panel.
[FIG. 4B] FIG. 4B illustrates an example of a method for producing a panel member
and a dash panel.
[FIG. 4C] FIG. 4C illustrates an example of a method for producing a panel member
15 and a dash panel.
[FIG. 51 FIG. 5 is a schematic view which sliows an example of bonding a main body
and a patch panel with a vibration attenuating resin layer after the main body and the
patch panel are respectively pressed.
[FIG. 61 FIG. 6 is a schematic sectional view for explaining a vibration attenuating
20 fi~nction that is performed by a vibration attenuating resin layer.
[FIG. 71 FIG. 7 is a schematic view showing an exatnple of providing a bead portion
at a portion which is not spot-welded.
[FIG. 81 FIG. 8 is a characteristic diagram showing multiple resins which have
different tenlperature characteristics from each other.
25 [FIG. 91 FIG. 9 is a sectional view showing an example of making a vibration
attenuating resin layer of multiple resin layers. .-
[FIG. 101 FIG. 10 is a sectional view showing an example of making a vibration
attenuating resin layer of multiple resin layers.
[FIG. 111 FIG. 11 is a sectional view showing an example of performing a fine
30 uneven surface processing on a surface of a main body or a surface of a patch panel,
which contact a vibration attenuating resin layer.
[FIG. 121 FIG. 12 is an external perspective view of a pallel member according to
another e~iibodin~eo~flt th e present invention.
[FIG. 131 FIG. 13 is an external perspective view of a shock absorber towel:
[FIG. 14A1 FIG. 14A is a sectional view of a trunk floor panel that is viewed from a
5 side.
[FIG. 14B1 FIG. 14B is a plan view of a patch member.
[FIG. 151 FIG. 15 is a plat1 view of another example of a patcli tnen~ber.
[FIG. 161 FIG. 16 is an external perspective view of a floor tunnel part.
[FIG. 171 FIG. 17 is a cliaracteristic diagram showing a transfer function of a main
10 body which was affixed with a patch member and a transfer function of a main body
which was not affixed with a patch ~netnber.
[FIG. 181 FIG. 18 is a characteristic diagram in a case in which a total plate thickness
of a main body that was affixed with a patch member was made the same as the plate
thickness of a main body that was not affixed with a patch member.
15 [FIG. 191 FIG. 19 shows a case in which a total plate thickness of a main body that
was affixed with a patch member was made the same as the plate thickness of a main
body that was not affixed witli a patch member.
[FIG. 201 FIG. 20 is a characteristic diagram showing a transfer filnction of each of
main bodies which had the same shape and wliich were respectively affixed with
20 panel members that included patch panels having different thicknesses from each
other.
[FIG. 211 FIG. 21 is a characteristic diagram sliowing a case of respectively affixing
patch members, which had different dimensions from each other, on mait1 bodies.
[FIG. 221 FIG. 22 is a cliaracteristic diagram sho\ving a case of affixing a patcli
25 me~llbera ccording to an ernbodi~nenot n a main body it1 comparisorl with a case of
affixing each of vibration attenuating sheets (thickness of 3 mm, 4.5 mtn, and 6 mm).
[FIG. 231 FIG. 23 is a schematic view showing a testing machine for measuring the
characteristics shown in FIGS. 17 to 22.
[FIG. 241 FIG. 24 is a plan view showing a condition that is viewed from the
30 direction of an arrow "A" in FIG. 23.
Description of E~nbodiments
[0016]
Hereinaftel; details of a panel member of the present invention will be
described. FIG. 1 is an external perspective view of a panel member 10 according
5 to an embodiment of tlie present invention. FIG. 2 is an external perspective view
showing a dash panel 20 which is produced by using tlie panel ~l~e~ll1b0e. r
[00 1 71
As shown in FIG. 1, the panel member 10 includes a plate-like main body
(base plate) 12 and a pair of patch members 15 which is affixed on tlie main body 12.
10 In this embodiment, in a plan view, tlie patch members 15 are smaller in size than the
main body 12. Each of the patch members 15 is formed of a patch panel 14 and a
vibration attenuating resin layer 18 (refer to FIG 4) whch is provided along a
surface of the patch panel 14, and the patch panel 14 is affixed on the main body 12
via the vibration attenuating resin layer 18. The panel member 10 has multiple
15 working scliedoled portions 10a which extend ~nutually in parallel. The working
scheduled portions 10a are portions which are to be deformed when a transportation
vehicle part (in this embodiment, a dash panel 20) is produced by usitig the panel
member 10.
[00 1 81
20 In this embodiment, for example, when the dash panel 20 is produced by
using the panel member 10 in an automobile manufacturing plant, bead working
(rigidity reinforcing ~vorking) is performed on the multiple working scheduled
portions 10a, and multiple worked portions are fornied. In this embodiment, as
shown in FIG. 2, multiple bead portions 22 are formed as the worked portions.
25 Each of the bead portions 22 is formed so as to extend in one direction. It should be
noted that the bead working is exemplified as tlie rigidity reinforcing working in this
embodiment, but another method such as emboss working may be perfor~ned.
[0019]
The main body 12 and tlie patch panels 14 are made of metal ~naterials( for
30 example, steel plates). More specific all^^, for example, a thin steel plate may be
used for the mail1 body 12. The thickness of tlie main body 12 is, for example, 0.5
to 3.2 mn~, and inore preferably 0.7 to 2.3 mm. As for the patch panels 14, for
example, a steel plate (such as a soft steel) which is made of the same metal material
as tlie main body 12 may be used. Details will be described later, but si~lce a
vibration attenuating function is perfomled by the vibration attenuating resin layer 18,
5 the patch panels 14 may be made of another metal material such as aluminum, a resin
material, or the like. In order to increase tlie rigidity of tlie panel member 10, a
metal material is suitably used for the patch panels 14. The thickness of the patch
panels 14 is, for example, 0.5 to 2.0 mm, and more preferably 0.7 to 1.2 nun. The
vibration attenuating resin layer 18 that is described later is nlade of a viscoelastic
10 resin, and for example, an acrylic resin which also functions as an adhesive may be
used.
[0020]
As show11 in FIG. 1, the patch panels 14 are spot-welded at the working
scheduled portions 10a on the main body 12. In this embodiment, lnultiple potions
15 of the patch panels 14 are bonded to the main body 12 by the spot welding. Thus,
each of the working scheduled portions 10a is formed with multiple spot-welded
portions SW. In order to spot welding the patch panels 14 to the main body 12, the
vibration attenuating resin layer 18 has condoctivity. It should be noted that the
bonding of the main body 12 and the patch panels 14 may not necessarily be
20 performed by the spot welding and may be perforn~edb y laser welding, arc welding,
arc spot welding, or the like. 111 a case of bonding the main body 12 and the patch
panels 14 by a method other than the spot welding, the vibration attenuating resin
layer 18 may not necessarily have conductivity.
[0021]
25 As shown in FIG. 2, the dash panel 20 that is produced by using the panel
member 10 is provided with a cross member 24, for example. Specifically, the '
cross member 24 is fixed on a front surface (surface it1 the front side in an
automobile longitudinal direction) of the dash pallel 20. In this embodiment, the
pair of the patch members 15 is provided at a position opposite to the position of the
30 cross member 24 so as to hold the main body 12 between the patch members 15 and
tlie cross member 24.
[0022]
FIGs. 3A, 3B, 4A, 4B, and 4C illustrate at1 example of a nlethod for
producing the panel member 10 and the dash panel 20. It should be noted that FIGs.
4A, 4B, and 4C are sectional views of the panel member 10 and the dash panel 20 in
5 the vicinity of the working scheduled portion 10a.
[0023]
As shown in FIG. 3A, for exanlple, first, a main body 12 and patch panels
14 are prepared, and patch members 15 are constructed by applying a vibration
attenuating resin layer 18 on each of the patch panels 14. Then, as show\n in FIGs.
10 3B and 4A, the main body 12 and the vibration attenuating resin layer 18 are made to
closely contact \tit11 each othel; and the patch members 15 are affixed on the main
body 12. Alternatively, as shown in FIG. 3A, an acrylic resin for the vibration
attenuating resin layer I8 is applied on predetermined areas 16 of the main body 12,
and then, as shown in FIGs. 3B and 4A, the patch panels 14 are affixed on the areas
15 16 that are applied with the acrylic resin. Thus, a vibration attenuating resin layer
18 is formed between the main body 12 and the patch panels 14.
[0024]
Then, as showvn in FIG. 48, the main body 12 and the patch panel 14 are
spot-welded at a working scheduled portion 10a. Specifically, as shown in FIG. 1,
20 the main body 12 and the patch panel 14 are spot-welded so tliat multiple spotwelded
portions SW will be formed at each of the working scheduled portions 10a.
In this embodiment, the spot welding is performed at a working scheduled portion
10a so that rnultiple spot-welded portions SW are arranged in two rows. Thus, a
panel mernber 10 is completed.
25 [0025]
Next, as shown in FIG. 4C, bead working is perfornied on the panel nlember
10 by using a pair of punches 30a and 30b of a press machine. Specifically, the
panel member 10 is held (pressed) by the pair of the punches 30a and 30b so tliat a
protrusion 26a will be fornled in the patch panel 14 and so that a protrusion 26b will
30 be formed in the main body 12 at each of the working scheduled portions 1Oa. Thus,
a bead portion 22 formed of the protrusions 26a arid 26b is formed.
[0026]
In this en~bodiment, wllen the bead working is performed on the panel
metilber 10, the iitain body 12 is cut into a predeternlincd shape (shape shown in FIG.
2) by the pair of the punches 30a and 30b. As a result, the dash panel 20 having the
5 multiple head pol-tions 22 is completed. Thus, by cutting the nlain body 12 into the
predetermined shape while the multiple bead portions 22 are forn~edt,h e dash panel
20 is produced in a short time.
[0027]
Here, in this embodiment, as shown in FIG. 4C, each of the bead portions 22
10 is formed so that the patch panel 14 side will protrude. More specifically, the bead
portion 22 has an approximately trapezoidal shape, in whicl~th e patch panel 14 side
is the top in a sectional view. By thus forming each of the bead portions 22, in the
dash panel 20, a pair of bent portions 28a is formed on the top side of each of the
bead portions 22, and a pair of bent portions 28b is formed at a base of each of the
15 bead portions 22. In this embodiment, the above described spot welding is
pei-formed on the panel member 10 beforehand so that the multiple spot-welded
po~tionsS W are positioned at each of the bent portions 28a. It should be noted that
some or all of the multiple bead portions may be formed so as to prottude in a
direction opposite to the-prot~udingd irection in the examples shown in FIGs. 2 and
20 4C (that is, the main body 12 side).
[0028]
As shown in FIGs. 4B and 4C, in the present invention, the bead portion 22
is a bent portion which has a height "h" that is 2 to 10 times greater than the plate
thickness "t" of the panel member 10 and which has a width "W" that is 5 to 30
25 times greater than the plate thickness "t", for example. The width "W" may be
nleasured by using-each position which stands from a flat portion of the dash panel
20 by a predetermined height (for example, a position at the height of 3 % of the
height "h"), as each side of the bead portion.
[0029]
30 In a case of making the main body 10 and the patch panels 14 of a soft steel,
press working can be performed by a hot stamping method or the like as shown in
FIG. 4C, in a condition in which the main body 10 and the patch panels 14 arc spotwelded.
On the other hand, in a case of tnaking the tnain body 10 and the patch
panels 14 of a relatively hard material which has a tensile strength of not less than
590 Mpa (such as high tensile steel), as shown in FIG 5, it is preferable that the main
5 body 10 and the patch panels 14 are bonded together wit11 the vibration attenuating
resin layer 18 and are spot-welded after the main body 10 and the patch panels 14 are
respectively pressed.
[0030]
Since the patch members 15 that are respectively constructed of the
10 vibration attenuating resin layer 18 and the patcll panel 14 are aftixed on the main
body 12, the panel member 10 in this embodiment exhibits a vibration attenuating
function by "shear deformation" of the vibration attenuating resin layer 18 which
occurs by bending vibration .
[003 11
15 FIG. 6 is a schematic sectional view for explaining the vibration attenuating
function that is performed by the vibration attenuating resin layer 18. As shown in
FIG. 6, the panel member 10 can be deformed (curved) by bending vibration. At
this time, in accordat~cew ith the bending vibration, the vibration attenuating resin
layer 18 is stretched in the plane direction by with a bonding interface between the
20 patch panel 14 and the main body 12, whereby defor~nationc alled shear defor~nation
occurs in the vibratiot~ attenuating resin layer 18. Then, the vibration energy is
converted into thermal energy by the shear deformation of the vibration attenuating
resin layer 18, whereby a vibration attenuating effect is obtained.
[0032]
25 I11 the panel member 10 relating to the present invention, as described above,
the main body 12 and the patch panels 14 are spot-wvelded beforehand at the working
scheduled portions 10a. Therefore, the rigidity of the bead portions 22 is
sufficiently improved in the dash panel 20 that is produced by using the panel
metnber 10, without increasing the thickness of the patch panels 14. Accordingly,
30 the vibration characteristic of the dash panel 20 is itnproved without increasing the
thickness of tl~epa nel tne~nber1 0.
[0033]
In this embodiment, after the patch panels 14 are affixed on the main body
12, the bead portions 22 are formed. In this case, the vibration attenuating resin
layer 18 that has a uniform thickness is fornled at the entire area of the bead portio~~s
5 22 between the main body 12 and each of the patch panels 14, and therefore, the
vibration characteristic of the dash panel 20 is reliably improved.
[0034]
Moreover, in this embodiment, \\hen the main body 12 is cut into a
predeter~llined shape, the bead portions 22 are formed. That is, the cutting of the
10 main body 12 and the forming of the bead portions 22 are performed it1 a single step.
Therefore, the working steps are not greatly increased, and the working cost is
reduced.
[0035]
The patch panel 14 may have any thiclu~essa s long as the patch panel 14
15 withstands the force of the vibration attenuating resin layer 18 in the plane direction
when the "shear deformation" occurs in the vibration attenuating resin layer 18,
which is described with reference to FIG. 6. In view of this, the patch panel 14
preferably has a plate thickness of not less than 0.3 mtn and not greater than the plate
thickness of the main body 12.
20 [0036]
The thickness of the vibration attenuating resin layer 18 is preferably not
less than 10 ptn and not greater than 1000 pm, and more preferably not less tl~an3 0
ptn and not greater than 100 tun. Thus, the vibration of the panel member 10 is
effectively attenuated.
25 [0037]
--In this embodiment, the pair of the patch members. 14 is provided at a
position that faces the cross tl~ember 24. The inventors of the present invention
examined details of a trans~nission route of noise and vibration from the driving
source of an automobile into the automobile (cabin). As a result, it was found that a
30 primary translnission route of noise and vibration fro111 the driving source into the
autonlobile includes the bonded portion of the nlain body 12 and the cross member
24. In view of this, in this embodiment, the patch inembers 14 are provided at tlie
positions that face tlie cross ~ilember 24. Thus, the tra~~smissioonf noise and
vibration into the auto~ilobilei s more reliably suppressed.
[0038]
5 In the embodiment described above, the case of bonding the main body 12
and the patch panels 14 at the bent portions 28a by the spot-welded portions SW is
described. By tlius providing the spot-welded portions SW at the bent portions 28a,
even when the panel 10 is deformed and a force is applied in a direction for peeling
off the patch panel 14 fsom the main body 12, since the main body 12 and the patch
10 panel 14 are bonded together by the spot-welded po~tionsS W, the patch panel 14 is
not peeled off fsom the main body 12, and the deformation is reliably suppressed.
Moreover, since the patch panel 14 is not peeled off fsom the main body 12, the
vibration attenuating function is reliably performed by the vibration attenuating resin
layer 18.
15 [0039]
In another case, the iliain body 12 and the patch panel 14 may be spotwelded
at portions other than the bent portions 28a. For example, as shown in the
sectional view in FIG. 7, the bead portion 22 may be provided at a portion which is
not spot-welded. Also, in this case, the vibration attenuating hnction of the
20 vibration attenuating resin layer 18 is obtained, and the effect of providing the bead
portioti 22 for improvi~igt he rigidity is obtained. For another example, tlie mait1
body 12 and the patch panel 14 may be spot-welded at a portion (flat pol-tiott)
between the pair of the bent portions 28a of the bead portion 22.
[0040]
25 - Although the panel member 10 that has the pair of the patch tne~~ibe1rs5 is
des~ribed in the above enlbodiment, the number of the patch members 15 is not
limited to the above example. For example, the panel member 10 may have one
patch member 15 or may have thee or more patch members 15. That is, by
affixing the patch member on any portion, of which vibration characteristic needs to
30 be improved, in the panel member 10 relating to the present invention, tl~ev ibration
characteristic of the tra~~sportatiovne hicle part is efficiently improved.
[0041]
The vibratiolt attenuating resin layer 18 may be made of different kirlds of
multiple resins. In this case, the vibration attenuating resin layer 18 is made of
multiple resins which have different tempcrahlre characteristics wit11 each other.
5 FIG. 8 is a characteristic diagram showing multiple resins which have different
temperature characteristics fi.0111 each other. In FIG. 8, a loss coefficient on the
vextical axis is a parameter which indicates a vibration attenuating characteristic, and
the vibration attenuating characteristic is higher when the value of the loss
coefficient is greater. FIGS. 9 and 10 are sectional views showing examples of
10 making a vibration attenuating resin layer 18 of nlultiple resin layers 18a and 18b.
I-Iere, the resin layer 18a exhibits a vibration attenuating functio~a~t high
temperatures (corresponds to a material for high temperatures shown in FIG. 8), and
the resin layer 18b exhibits a vibration attenuating function at ordinary temperah~res
(corresponds to a material for ordinary temperatures shown in FIG. 8). FIG. 9
15 shows an example of latninating the resin layer 18b immediately on the resin layer
18a, and FIG. 10 shows an example of inserting a panel 19 between the resin layer
18a and the resin layer lab. Thus, in the panel member 10, the vib~atiot~
attenuating function is performed in l~lultiplec onditio~lso f different temperatures.
[0042] .
20 FIG. 11 is a sectional view sho\ving an example of performit~ga fine uneven
surface processing (such as satin finish processing) on a surface of the main body 12
or a surface of the patch panel 14, which co~~tatchte vibration attenuating resin layer
18. The surface processing is performed by a n~ethod such as sand blast, etching,
etc. Thus, an anchoring effect is obtained by the surface processing, aud the
25 adhesion of the main body 12 or the patch panel 14 with respect to the vibratioli - attenuating resin layer 18 is increased, whereby the vibration attenuating functio~is~
reliably performed by the "sl~ear deformation" described above.
[0043]
Altl~oughth e case of arranging the multiple working scheduled portio~ls1 0a
30 so as to extend muh~ally it1 parallel is described in the above embodiment, the
arrangement of the workir~gs cl~eduledp ortions is not li~nitedto the example descried
above. For example, as in tlie panel tnetnber 40 sl~oown in FIG. 12, a pair of working
scheduled portions 40a niay be arranged so as to cross each other in each of the patch
members 15. In this case, spot-welded portions SW are for~ncda long each of the
working scheduled portions 40a.
5 [0044]
Afthoug11 the dash panel 20 is described as an example of the transportation
vehicle part in tlie above embodiment, the panel member of the present invention can
be fornied into another traiisportation vehicle pal?.
100451
10 For example, as shown in FIG. 13, a shock absorber tower 42 may be
produced by using the panel member relating to the present invention. The shock
absorber tower 42 includes a inaitl body 44, which contains a shock absorber that is
not sliown in the figure, and a hollo\v disk-shaped patch panel 46, wluch is affixed on
the main body 44 via the vibration attenuating resin layer 18 that is not shown in tlie
15 figure. Here, a patch member 45 is constructed of the patch panel 46 and the
vibration attenuating resin layer 18. Tl~e patch meniber 45 is affixed on a top
portion 44a @ortion that supports a shock absorber that is not shown in the figure) of
the main body 44. The tnai~ib ody 44 and tlie patch panel 46 are respectively made
of materials similar to the main body 12 and the patch panel 14 described above. In
20 the shock absorber tower 42, thc top portion 44a and the patch member 45 are
forn~edw ith multiple bead portions 42a which extend radially. The bead portions
42a have the structure similar to the bead portion 22. Specifically, the bead portions
42a are formed by performing the bead working on the top portion 44a and t11c patch
member 45 as in the case of the bead portion 22 described above. The tilain body
25 44 (top portion 44a) and the patch panel 46 are bonded together by multiple spot-
,. welded portions SW which are formed at the bead portiotis 42a. The multiple spotwelded
portions SW are fornied before the panel meniber is formed illto the shock
absorber tower 42, that is, formed in the panel member beforehand.
[0046]
30 I-Iere, the iiiventors of the present invention examined details of a
transmission route of noise and vibration froin the driving source of an autotnobile
into the automobile. As a result, a primary transnlissio~r~o ute of noise and
vibration fsonl the driving source into the autonlobile includes a shock absorber
tower. Moreover, according to the result of the examination that was conducted by
the inventors of the present invention, vibration is greater at tl~eto p portion of the
5 shock absorber tower. Therefore, the inventors of the present invention arranged
the patch n~etnber4 5 on the top portion 44a of the shock absorber tower 42. Thus,
the rigidity of the top portion 44a is improved, whereby noise and vibration are
efficiently suppressed in the shock absorber tower 42.
[0047]
10 For another example, as shown in FIGS. 14A and 14B, a trunk floor panel 48
may be produced by using the panel member relating to tl~epr esent invention. FIG.
14A is a sectional view of the tsullk floor panel 48 that is viewed from a side, and
FIG. 14B is a plan view of a patch member 52. In the example shown in FIGs. 14A
and 14B, the patch member 52 is const~~~cotef da patch panel and a vibration
15 attenuating resin layer, and the patch panel is affixed on a main body 50 via the
vibration attenuating resin layer, as in the case of the above embodiment. As sl~own
in FIG. 14A, the tru~lkf loor panel 48 includes the main body 50, which constitutes a
floor portion of a trunk, and the patch member 52, which is affixed on the main body
50 via an adhesive layer that is not shown in the figures. The main body 50 has a
20 storage portio~5~0a for storing a spare tire 54. The patch member 52 is affixed on a
bottom 50b of the storage postion 50a.
[0048]
As sho\vn in FIG. 14B, the patch member 52 has a disk shape. In the trunk
floor panel 48, the bottonl 50b and the patch member 52 are formed with a bead
25 portion 48a. The bead portion 48a is formed so as to radially extend fsom the center
of the bottom 50b and the patch member 52 in three directions. Tlle bead portion
48a has the structure similar to the bead portion 22 described above. Specifically,
the bead portion 48a is formed by performing the bead working on the bottom 50b
and the patch member 52 as in the case of the bead portion 22 described above.
30 The nlain body 50 (bottom 50b) and the patch member 52 are bonded together by
multiple spot-welded portions SW which are fom~ed in the bead portion 48a, as in
the case of tlie main body 12 and the patch member 14 described above. The
multiple spot-melded portioris SM' are formed before the panel member is formed
into the trunk floor panel 48, that is, formed in the panel member beforehand. The
bead portion is preferably formed so as to radially extend fi.0111 the center of the
5 bottom 50b and the patch member 52 in directions of iiot less than three in odd
numbers. For cxample, as shown in FIG. 15, the bead portion 48b may be formed
so as to radially extend from the center of the main body 50 (refer to FIG. 14A) and
the patch member 52 in five directions.
[0049]
10 By providing the patch member 52 as described above, the rigidity of the
bottonl 50b of the storage portion 50a is improved. Thus, even when the spare tire
54 shakes within the storage portion 50a while the automobile travels, the vibration
of tlie storage portion 50a is suppressed. As a result, transmission of noise and
vibration from the trunk floor panel 48 into tlie automobile is suppressed.
15 [0050]
Moreover, by forming tlie bead portion so as to radially extend from the
center of the bottom 50b and the patch metnber 52 in the directions of not less than
thee in odd numbers, vibration having the lowest frequency, that is, vibration of a
primary mode wvhich resonates first after the vibration starts, is sufficiently
20 suppressed at the center of the bottom 50b. Thus, the transmission of noise and
vibration from the trunk floor panel 48 into the autoniobile is reliably suppressed.
[005 11
Although the case of producing the transportation vehicle part by
performing tlie bead working on tlie panel metnber relating to tlie present inverition is
25 described in the above embodiment, the transportation vehicle part may be produced
by perfomling another working owthe panel member.
[0052]
For example, as shown in FIG. 16, a floor tunnel part 56 (metnber for
constructing a floor of an automobile) may be produced by bending the panel
30 member relating to tlie present invention by a press machine or tlie like. The floor
tunnel part 56 includes a main body 58 and a patch member 60. Here, the patch
tllember 60 is constructed of a patch pallel and a vibration attenuating resin layer that
is not shown in the figure, and the patch panel is affixed on the maill body 60 via the
vibration attenuating resin layer, as in the case of the above embodimelit. The patch
member 60 is affixed so as to cover at least a part of the main body 58 froln above.
5 The main body 58 and the patch panel of the patch me~nber6 0 are respectively made
of materials similar to the main body 12 and the patch panel 14 described above.
[0053]
The main body 58 and the patch member 60 are respectively formed so as to
protrude upwardly. Thus, a pair of bent portions 56a is formed at a top side of the
10 floor tunnel part 56, and a pair of bent portions 56b is fonned at a base of the floor
tunnel part 56. The main body 58 and the patch member 60 are bonded together at
each of the bent portions 56a by nlultiple spot-welded portions SW. The multiple
spot-welded portions SW are formed before the panel member is formed into the
floor tunnel part 56, that is, formed in the parlel ~iienlber beforehand. More
15 specificall>: in the panel member, portions which become a pair of the bent portions
S6a are spot-welded beforehand.
[0054]
By providing the patch member 60 as described above, the rigidity of the
floor tu~lnel part 56 is improved, whereby the vibration characteristic of the floor
20 tu~lnelp art 56 is improved. Thus, transmissiorl of vibration and noise, which are
generated from the driving source, via tlie floor tunnel part 56 into the automobile is
suppressed.
[0055]
Although details are not described by referring to figures, other autotnobile
25 parts (transportation vehicle parts) such as a floor panel, \vIieel house inner, and the
like, may be produced by using the panel member relating to the present invention.
[0056]
The effects of the present itivention will be described by using examples
hereinafter, but the present invention is not limited to tlie follo\vi~ige xamples.
30
[Exanlples]
[0057]
FIGs. 17 to 22 are characteristic diagrams for explaining the vibration
attenuating effect of the vibration attenuating resin layer 18. FIG. 17 is a
characteristic diagram showing a transfer fi~nctiono f the main body 12 which was
5 affixed with the patch member 15 and a transfer function of the main body 12 which
was not affixed with the patch member 15. Here, the transfer fu~~ctiowna s
measured by using a testing machine shown in FIG. 23. As shown in FIG. 23, the
panel member 10, in which the batch mernbcr 15 was affixed on the main body 12,
was held by springs 110 and was vibrated by an excitation machine 100. FIG. 24 is
10 a plan view showing a condition which is viewed from the direction of an arrow "A"
in FIG. 23. As shown in FIGs. 23 and 24, the main body 12 and the patch panel 14
were bonded together via the vibration attenuating resin layer 18, and an acceleration
was measured by an accelerometer when the panel member 10 was vibrated by the
excitation tnachine 100.
15 [0058]
FIGs. 17 to 22 show transfer functions that were obtained from the
measured accelerations. Here, the lower value of the transfer fi~nctionin dicates that
the vibration is niore effectively suppressed. As shown in FIG. 17, the value of the
transfer fi~nctionw as greatly decreased in the characteristic (solid line) wl~ichw as
20 obtained in the case of affixing the patch member 15 on the main body 12 \vhen
compared with the characteristic (broken line) which was obtained it1 the case of not
affixing the patch nlen~ber 15 on the inain body 12. Accordingly, vibration was
effectively suppressed by affixing the patch member 15.
[0059]
25 111 general, noise due to vibration is generated at frequencies of not greater
than 1 kHz. The~eforea, ccording to the result shown in FIG. 17, vibratio~i~s
effectively attenuated at frequencies of not greater than 1 kHz, and generation of
noise is suppressed.
[0060]
30 FIG. 18 is a characteristic diagram sl~owing a transfer function of the main
body 12 which was affixed with the patch member 15 and a transfer fi~nctiono f the
main body 12 which was not afixed with the patch lnetnber 15, and FIG. 18 shows a
case in which tbe total plate thickness of the main body 12 that was affixed with the
patch member 15 was niade the same as the plate thickness of the tnain body 12 that
was not affixed with the patch member 15. Here, in the case of affixing the patch
5 member 15 on the main body 12, a steel plate having a thickness of 0.6 mtn, a length
of 500 mm, and a width of 600 n~nwi as used as the main body 12, and a steel plate
having a thickness of 0.4 mm, a length of 400 rnnl, and a width of 500 m n was used
as the patch panel 14. In the case of not affixing the patch n~ember 15 on the main
body 12, a steel plate having a thickness of 1.0 mm, a length of 500 mm, and a width
10 of 600 mm was used as the main body 12. As shown in FIG. 18, the value of the
transfer fi~nctionw as greatly decreased in the characteristic (solid line) which was
obtained in the case of affixing the patch member 15 on the main body 12 when
compared with the characteristic (broken line) which was obtained in the case of not
affixing the patch member 15 on the main body 12. Since the total plate thickness
15 of the main body 12 that was affixed with the patch member 15 was made the same
as the plate thickness of the main body 12 that was not affixed with the patch
member 15, it was found that the decrease in the value of the transfer function is
greatly affected by the vibration attenuating effect that is obtained by the shear
deformation of the vibration attenuating resin layer 18.
20 [0061]
Similarly, FIG. 19 is a characteristic diagram showing a transfer function of
the main body 12 which was affixed with the patch member 15 and a transfer
function of the main body 12 which was not affixed with the patch member 15, and
FIG. 19 shows a case in which the total plate thickness of the main body 12 that was
25 affixed with the patch member 15 was made the same as the plate thickness of the
main body 12 tlrat was not affixed with the patch member 15. Here, in the case of
affixing the patch member 15 on the main body 12, a steel plate having a thickness of
0.6 mm, a length of 500 tnm, and a \vidth of 600 mm was used as the main body 12,
and a steel plate having a thickness of 0.6, a length of 400 mm, and a width of 500
30 mm was used as the patch panel 14. In the case of not affixing the patch tnetnber
15 on the n~aiub ody 12, a steel plate having a thickness of 1.2 mm, a length of 500
inm, and a width of 600 mm was uscd as the main body 12. As shown in FIG. 19,
the value of the transfer function was greatly decreased in the characteristic (solid
line) which was obtained in the case of affixing the patch nlember 15 on the main
body 12 when compared with the characteristic (broken line) which was obtained in
5 the case of not-affixingth e patch member 15 on the main body 12. Since the total
plate thickness of the main body 12 that was affixed with the patch member 15 was
.. made the same as the plate thickness of the main body 12 that was not affixed with
the patch member 15, it was found that the decrease in the value of the transfer
fi~nctionis greatly affected by the vibration attenuating effectt hat is obtained by the
10 shear deforlnation of the vibration attenuating resin layer 18.
[0062]
FIG. 20 is a cl~aracteristicd iagram showing a transfer function of each of
tnain bodies 12 which had the same shape and which were respectively affixed with
panel members 15 that included patch panels 14 having different thicknesses from
15 each other. Here, a steel plate having a thickness of 0.8 mm, a length of 500 mm,
and a width of 500 mm was used as the main body 12, and a steel plate having a
thickness of 0.4 mm, a length of 250 mm, and a width of 250 tnm, a steel plate
having a thickness of 0.6 mrn, a length of 250 mm, and a width of 250 mm, or a steel
plate having a thickness of 0.8 mni, a length of 250 mn, and a width of 250 mm was
20 used as the patch panel 14. As shown in FIG 20, the value of the transfer functioli
did not greatly vary even w11en the thickness of the patch panel 14 was changed.
Accordingly, in the case of affixing the panel member 15 on the main body 12, the
decrease in the value of the transfer fi~nction was greatly affected by the vibration
attenuating effect that was obtained by the shear defomiation of the vibration
25 attenuating resin layer 18.
[0063] -. ...
FIG. 21 is a characteristic diagram showing a case of respectively affixing
patch members, which had different dinlensions from each other, on the main bodies
12. Here, a steel plate having a thickness of 1.0 mm, a length of 500 mtn, and a
30 width of 600 tllm \\?as uscd as the tnain body 12, and a steel plate having a thickness
of 0.5 nlm \\.as used as the patch panel 14. As the patch panel 14, a steel plate
having a length of 250 llnn and a width of 250 nun, a steel plate having a length of
100 mm and a width of 100 mtn, or a steel plate having a length of 400 mm and a
width of 500 rntn was used. As shown in FIG. 21, when the area of tlie patcli panel
14 was greatel; the vibration attenuating effect was greater.
5 [0064]
FIG. 22 is a characteristic diagram showving a case of affixing the patch
member 15 according to an embodiment on the main body 12 in comparison with a
case of affixing each of vibration attenuating sheets (asphalt sheets; thickness of 3
nun, 4.5 mm, and 6 mm). Here, in the case of affixing the patch member 15 on tlie
10 main body 12, a steel plate having a thickness of 0.6 mm, a length of 500 ~nma,n d a
width of 600 nun was used as the main body 12, and a steel plate having a thickness
of 0.4 nlm, a lengtli of 400 nim, and a width of 500 mm was used as the patcli panel
14. In the case of affixing the vibration attenuating sheet (tliickness of 3 mm, 4.5
mni, or 6 mm) on the main body 12, a steel plate having a thickless of 1.0 mm, a
15 length of 500 mm, and a width of 600 mm was used as tlie main body 12, and a
vibration attenuating sheet (thickness of 3 mm, 4.5 mm, or 6 mm) having a length of
320 mtn and a width of 510 mni was used. As shown in FIG. 22, when the
characteristic (solid line) which was obtained in the case of affixing the patch
member 15 on the tnain body 12 is compared with the case of affixing the vibration
20 attenuating sheet having the thickness of 3 mm, 4.5 nnn, or 6 n1111 on the tnain body
12, a vibration attenuating characteristic which is equivalent to the vibration
attenuating characteristic of the vibration attenuating sheet having the tliickness of
4.5 nnn was obtained by affixing the patch member 15. I-Iowevel; the ~veightw vas
2.06 kg when the patch member 15 was affixed on the main body 12, whereas the
25 weight was 2.84 kg when tlie vibration attenuating sheet having the thickness of 4.5
mm was affixed on the main body 12. Therefore, according to this embodiment, the
wweiglit is reduced compared with the case of affixing the vibration attenuating sheet.
Moreovel; the total thickness of the nmain body 12 and the patcli rnember 15 wvas 1
nn~iin this etnbodimetit and was snlaller than the tliickness of the main body 12 that
30 wvas affixed with the vibration attern~ating sheet with the tliickness of 4.5 mm, and
therefore, a space is easily secured when tlie main body 12 affixed with the patcli
member 15 is used in a vehicle.
[0065]
In order to examine the effects of the present invention, the inventors of tlic
present invention prepared panel members as an example and comparative examples
5 1 and 2. As shown in Table 1 described below, in the exanlple and the eomparative
examples 1 and 2, a steel plate of 590 MPa class having a plate thickness of 0.5 rnnl,
a length of 200 mm, and a width of 200 mm was used as the 1nai11 body. As the
patch member, a steel plate of 590 MPa class having a plate thickness of 0.5 tnm, a
length of 100 mln, and a width of 100 mm was used. The patch member was
10 affixed at a center portion of the mait1 body by using an acrylic resin. A linear bead
pol-tion having a height of 5 mm, a width .of 20 tnm, and a length of 100 mn was
formed at a center portion of the panel member of each of the example and the
comparative example 1. Moreovel; the panel member of the example was spotwelded
at a working scheduled portion (portion to be formed with the bead portion).
15 More specifically, the spot welding was performed at portions which became a pair
of bent portions (cossesponding to the pair of the bent postions 28a in FIG. 4C) in the
bead portion. The spot welding was performed so that five spot-welded portions
would be positioned at equal intervals of 25 mm at each of the bent portions. Thus,
themain body and the patch member were bonded together-before the bead working.
20 [0066]
[Table 11
Patch tnernber (steel plate
'~
I formed I perfonned
[0067]
A fieq~iencpo f a prima~ym ode of a panel tnetnber of each of the example
25 and the comparative examples 1 and 2 having the above structures was measured by
. .
Example
Comparative
exan~ple 1
Comvarative
Main body (steel plate of
590 MPa class)
plate
.thickness
(n1111)
0.5
Length
(lnrn)
200
Width
(lllm)
200
experiment. The measurement results are sho\vn in the followi~lg Table 2. It
should be noted that the frequency of each of the exa~nple and the coniparative
examples I and 2 is show11 by a dimensionless value based on the fiequcncy of the
panel tne~nbero f the conlparative exa~uple2 in Table 2.
5 [0068]
When the experiment result of the panel member of the comparative
10 example 1 having the bead portion is co~npared with the experiment result of the
comparative example 2 without the bead portion, the freque~icyo f the primary mode
[Table 21
of the panel member of the co~nparative example 1 was approximately 2.5 times
seater t11a11 the frequency of the primary mode of the panel member of the
Frequency
comparative example 2. According to this result, by forming the bead portion, the
15 frequency of the prima~y mode of the panel member is increased, whereby the
vibration characteristic of the pallel menlber in a Low frequency region is improved.
When the experiment result of the panel member of the example is compared with
the experinlent result of the panel nie~nber of the comparative example 1, the
frequency of the prinlary mode of the panel member of the example was even greater
Example
2.94
.20 than the frequency of the panel nlember of the co~nparative example 1 by
approximately 18 %. According to this result, by perfor~ningt he spot welding on
the working scheduled portion beforehand, the vibration characteristic of the panel
member in the low fiequency region is further improved. That is, the superior
effects of the present inventio~w~e re recognized.
25 [0070]
As described above, according to the embodiment, since the panel member
10 is constructed by affixing the patch ~nember 15, which is formed of the patch
Comparative
example 1
2.49
panel 14 and the vibration attetmating resin layer 18, on the mait] body 12, the
vibration attenuating function is perfor~ned by the "shear defonnation" of the
Comparative
exaniple 2
1 .O
vibration attenuating resin layer 18, \vhereby generation of vibration and noise due to
the vibration are suppressed to a rninimun~. Moreover, by using the patch member
15, the plate thickness is decreased conlpared with a case of using a conventional
vibration attenuating sheet, whereby a space withitl a vehicle is greatly enlarged.
5 Furthennore, by using the patch member, the weight is further reduced compared
with a case of using a conventional vibration attenuating sheet.
[0071]
Heretofore, preferred e~nbodinlents of the present invention have been
described in detail wit11 reference to the appended drawings, but the present invention
10 is not limited thereto. It sl~ould be understood by those skilled in the art that various
changes and alterations may be made without departing from the spirit and scope of
the appended claims.
Industrial Applicability
[0072]
15 By using the panel member of the present invention, a transpo~tationv ehicle
part, in which the vibration characteristic is improved while the thickness and the
weight are not greatly increased, is produced. Accordingly, the present invention is
suitably used for transportation vehicle parts.
20 Reference Signs List
[0073]
10,40 panel member
10a, 40a working scheduled portion
12,44,50,58 main body
25 14,46,52,60 patch panel
15 patch member
18 vibration attenuating resin layer
20 dash panel
22,42a, 48a, 48b bead portion
30 28a, 28b, 56a, 56b bent portion
42 sl~ocka bsorber tower
48 trunk floor panel
56 floor tunnel part
CLAIMS
Claiin 1
A transportation vehicle part conlprising:
a patch member constructed of
a plate-like metal patch panel, and
a vibratiotl attenuating resin layer provided along a surface of the
patch panel; and
a metal base plate closely adhered with the vibration attenuating resin layer
of the patch member and affixed with the patch member.
10
Claim 2
The transportation vehicle part according to claim 1,
wherein the patch panel and the base plate are welded together at at least
one part of the patch panel and the base plate.
15
Claim 3
The transportation vehicle part according to claim 1 or 2,
wherein the transportation vehicle part includes a ridged portion, and the
patch panel and the base plate are welded together at at least one part of the ridged
20 portion.
Claim 4
The transportation vehicle part according to any one of claims 1 to 3,
wherein the transportation vehicle part is provided with a rigidity reinforced
26 portion which has an uneven shape.
The transportation vehicle part according to any one of claims 1 to 4,
wherein the vibration attenuating resin layer is an electrically conductive.
30
Claiin 6
The transportation vehicle part according to any one of clainls 1 to 5,
wherein thc patch panel has a thickness of not less than 0.3 nun and not
greater than a thickness of the base plate.
5 Claim 7
The transportation vehicle part according to any one of clainls 1 to 6,
wherein the vibration attenuating resin layer has a thickness of not less than
10 pnl and not greater than 1000 pm.
10 Claim 8
The transportation vehicle part according to any one of claims 1 to 7,
wherein the vibration attenuating resin layer is constructed of multiple
layers which have different temperature characteristics with each other.
15 Clairn 9
The transportation vehicle part according to claim 8,
wherein a panel is inserted between the multiple layers.
Claim 10
20 The transportation vehicle part according to any one of claims 1 to 9,
wherein an uneven surface processing is perfornied on a surface of the patch
panel or a surface of the base plate, which contacts the vibration attenuating resin
layer.
25 Claim 11
A panel rnenlber comprising:
a patch member constructed of
a plate-like metal patch panel, and
a vibration attenuating resin layer provided along a surface of the
30 patch panel; and
a metal base plate closely adhered with the vibration attenuating resin layer
/ I
of the patch me~iibera rid affixed \vitll the patch member.