Description
Title of Invention
JOINT STRUCTURE BODY OF MEMBERS
Technical Field
[OOOl]
The present invention relates to a joint st~~~ctbuordey formed by joining
members.
10
Background A1-t
[0002]
An automobile body has a joint where an end of a second member is joined
to a surface of a first member so as to be thrust against the surface. As such a joint,
15 for example, a joint between a side sill and a floor cross member, a joint beheen a
tutlnel and a floor cross member, a joint between a roof rail and a roof cross member,
a joint between a wheel house and a rear floor cross member, and a joint between a
front side member and a dash cross member are given. At the joints illustrated
herein, the end of the second member is provided with a flange, and the second
20 menlber is joined to the first member using the flange.
[0003]
In the automobile body, high mechanical properties are required also for a
structure body having such a joint. For example, For such a joint structure body, it
is regarded as important to improve the torsio~lalr igidity and the absorbed energy
25 propelties in axial crushing. In this regard, in Patent Literature 1, a structure in
~v11ic11 the second member side is provided with a continuous flange with no notch
and a spot welding portion is formed in the flange to join the second member to the
first nlenlber is disclosed. By such a joint structure described in Patent Literature 1,
the defor~nation of car width members can be suppressed and the torsional rigidity
30 can be improved.
Patent Literature
[0004]
Patent Literature 1 :
213 1
Citation List
Summary of Invention
Technical Problern
[0005]
Although the deformation of car width members is suppressed and the
10 torsional rigidity is improved by the joint structure described in Patent Literature I ,
further performance improvement is desired. In addition, such performance
improvement is similarly desired, not only for car bodies, but also for structure
bodies having a similar joint structure.
[0006]
15 Thus, the present inve~ition has been made in view of the issue mentioned
above, and an object of tlle present invention is to provide a novel and improved joint
structure body that makes it possible to further improve tlie mechanical properties, in
particular the torsional rigidity and the absorbed energy properties in axial cmshing,
of a joint structure body including a joint fornied by joining members.
20
Solution to Problem
[0007]
In order to solve the above problenis, accordi~lgto an aspect of the present
invention, there is provided a joi~it structure body of ~iiembers including a first
25 member, a second member, an end of the second rneniber being thust against a
surface of tlie first member, and a joint that joins the first member and~tlies econd
member. Tlie joint includes an cud flange that is formed continuously along tlie end
of the second member and of which at least one part overlaps tlie surface of the first
~nenibera nd a uuit joint that joins the end flange and the first member, the end flange
30 is fortiied continuously to at least one part of tlie end of tlie second nie~~ibveira a
rising curved surface portion and tlie rising cu~ved surface portion includes a wvallthickened
portion of which a sheet thickness is made larger than a shcet thickness of
the second rtle~nbcl;a nd at least one part of the unit joint is provided in a range of 3
mm or less fiom a boundary bet\veen the end flange and the wall-thickened portion.
[00081
5 The second metnber may have a substantially hat-like or gutter-like crosssectional
shape, the end flange may include a ridge flange formed at an end of a ridge
between a web part and a wall part forniing the substantially hat-like or gutter-like
shape, and the wall-thickened portion may be formed it1 the rising curved surface
portion between the ridge and the ridge flange.
10 [0009]
The unit joint may be formed continuously fro111 the end of the ridge to an
end of at least one part of the web part and the wall part continoing to the ridge.
[OOlO]
The unit joint may be formed continuously over an entire length of one part
15 of the end flange, the part being in contact with the surface of the first member.
[OOll]
Unit joints may be fornied intermittently in the end flange, and a length of
the unit joints may be a length of 50% or more of an entire length of an area where
the end flange and the first member are in contact.
20 [0012]
A spot welding portion majr be fi~rtherp rovided in the joint
[00 131
The first member may be a floor tumlel or a side sill of an automobile, and
the second member may be a floor cross member.
25
Advantageous Effects of Invention
[0014]
As described above, by the joint structure body of nlenibers of the present
invention, it becomes possible to further improve the mechanical properties, in
30 particular the torsional rigidity and the absorbed energy properties in axial crushing.
Brief Description of Drawings
[0015]
[FIG. I] FIG. 1 is a perspective view showing a joint structure body according to an
embodiment of the present i~ivention.
5 [FIG. 21 FIG. 2-is an illustration diagram showing an enlarged view of a joint
according to the embodiment.
[FIG. 31 FIG. 3 is a cross-sectional view of a floor cross member.
[FIG. 41 FIG. 4 is an illustration diagram slio\ving a joint.
[FIG. 51 FIG. 5 is an illustratiotl diagram sho\ving a joint including a wall-thickened
10 portion.
[FIG. 61 FIG. 6 is an illustratio~l diagram showing an example of a press molding
apparatus.
[FIG. 71 FIG 7 is at1 illustration diagram slio\ving a situation of press molding.
[FIG. 81 FIG. 8 is an illustration diagram showing a sheet thickness distributioli of a
15 ridge flange and a rising curved surface portion.
[FIG. 91 FIG. 9 is an illustration diagram showing a sheet thickness distribution of a
rising curved surface portion.
[FIG. 101 FIG. 10 is an illustration diagram showing a joint according to a first
modification example.
20 [FIG. 111 FIG. 11 is an illustration diagram showing a joint according to a second
modification example.
[FIG. 1.21 FIG. 12 is an illustration diagram showing a joint according to a third
modification example.
[FIG. 131 FIG. 13 is an illustration diagram showing a joint according to a fourth
25 modification example.
[FIG. -I41 FIG. 14 is an illustratio~i diagram slio\ving a joint according to a fifth
modification example.
[FIG. 151 FIG. 15 is an illustration diagram showing a joint accordi~ig to a sixth
modification example.
30 [FIG. 161 FIG. 16 is a perspective view showing another example of a joint structure
body.
[FIG. 171 FIG. 17 is a perspective vie\\. showing another exa~iipleo f a joint structure
body.
[FIG. 181 FIG 18 is an illustration diagram sllowing a joint of Example 1.
[FIG. 191 FIG. 19 is an illustration diagram showing a joint of Exanlple 4.
5 [FIG. 201 FIG. 20 is an illustration diagram showing a joint of Comparative Exanlple
1.
[FIG. 211 FIG. 21 is an illustration diagram showing a joint of Conlparative Example
2.
[FIG. 221 FIG. 22 is an illustration diagram showing a joint of Comparative Exaniple
10 4.
[FIG. 231 FIG. 23 is a diagram shown in order to describe an evaluation method.
[FIG. 241 FIG. 24 is a graph describing results of torsional rigidity in evaluatio~l1 .
[FIG. 251 FIG. 25 is a graph describing results of axial crushitig propel-ties in
evaluation 1.
15 [FIG. 261 FIG. 26 is a graph describing results of axial crushing properties in
evaluation 2.
[FIG. 271 FIG. 27 is a graph describing the results of the axial crushing properties in
evaluation 2.
[FIG. 281 FIG. 28 is a graph describing results of torsional rigidity in evaluation 2.
20 [FIG. 291 FIG. 29 is a graph describing the results of the torsional rigidity in
Description of Embodiments
[0016]
25 I-lereinafter, preferred embodiments of the present invention will be
described in detail with reference to the appended drawings. Note that, in this
specification and the appended drawings, structural elements that have sitbstantially
the satlie function and structure are denoted with the same reference numerals, and
repeated expla~lationo f these structural elements is omitted.
30 [0017]

FIG. 1 is at1 illustration diagram of a joint structure body 1 according to an
etllbodi~llent of the present invention, and is a perspective view showing a part of a
floor 2 of an automobile body as the joint structure body 1. With a tnnnel menlber
3 (floor tu~lnel)a s a first member and a floor cross nletnber 10 as a second nlenlbel;
5 the joint structure body 1 according to the embodiment has a joint 15 at which an end
of the floor cross member 10 is joined to a side surface of the tunnel niember 3 so as
to be tluust against the side surface in a T-shaped configuration.
[OO 181
For the tunnel member 3 and the floor cross tnetnber 10, the material and
10 shape of the parts other than the joint 15 tnay be a known configuration. It1 the
embodiment, a description is given using the joint structure body 1 having the joint
15 between the tunnel tnelnber 3 and the floor cross metnber 10 as an example; but
the joint stmctt~re body 1 is not limited to such an example. For example, the
emboditnent can be applied also to a joint structure body of a side sill (corresponding
15 to the first mernber) and a floor cross metnber (corresponding to the second member),
a joint structure body of a roof rail (corresponding to the first member) and a roof
cross member (corresponding to the second member), a joint structure body of a
wheel house (corresponding to the first member) and a rear floor cross mernber
.(corresponding to the second menlber), and a joint structure body of a front side
20 member (corresponding to the first member) a d a dash cross member
(corresponding to tile second member).
[00 191
<2. Joint>
FIG. 2 shows an enlarged view of the joint 15 of the joint structure body 1
25 sho~vnin FIG. 1. FIG. 3 shows a cross-sectional view of the floor cross meruber 10
taken along line 111-111 slio\vn in FIG. 2. FIO: 3 is a view of a cross section
(hereinaftel; occasionally referred to as a "horizontal cross section") orthogotla1 to
the longitudinal direction of the floor cross member 10 (the direction in \v11ich the
floor cross ~netnber 10 extends) as viewed facing the joint 15 side, in which the joint
30 15 is seen in front. FIG. 4 sho~vsa cross-sectional view of the joint 15 taken along
line IV-IV shown in FIG. 3. FIG. 5 shows a cross-sectional view of the joint 15
taken along line V-V sho\vn in FIG. 3.
[0020]
I11 tlie eelnboditnent, the floor cross inember 10 has a web part 11 forming
the upper surface, wall parts 12 extending fiom ends of tlie web part 11 so as to
6 droop down, and a longitudinal flange 13 estendi~igf rom the end of tlie wall part 12
otl the opposite side to the web part 11. The wall parts 12 are fomied conti~iuously
to both ends of the web part 11. A ridge 19 is for~iiedb etween the web part 11 arid
the wall part 12. The floor cross member 10 is a ~netnberh aving a horizontal cross
section of a substantially hat-like shape by means of the \web part 11, the ridges 19
10 continuing to both ends of the web part 11, and the two wall parts 12 continuing
further from the ridges 19. The floor cross member 10 is formed by, for example,
press molding using a high-tensile steel sheet.
[0021]
For the longitudinal direction of the floor cross member 10, as shown in FIG.
15 2, spot welding portions 13a are formed in the longitudinal flange 13, and tlie floor
cross member 10 is joined to a floor member 4 by spot eld ding. The joining of the
longitudinal flange 13 to the floor member 4 may be performed by weld bonding
using spot welding in co~nbitlatiotwl ith an adhesive or by laser welding.
[0022]
20 On the other hand, in the joint structure body 1 including the floor cross
member 10, the joint 15 to the tunnel member 3 is formed at an end in the
longitudinal direction of the floor cross member 10. The joint 15 has an end flange
16 formed at the end in the longitudirial direction of the floor cross member 10 and a
unit joint 17 that joins the floor cross member 10 and the t~tmenl ie~nber3 via tlie
25 end flange 16. The unit joint 17 is one part that actually joins the end flange 16 and
tlie turmel ~nenlber3 .
[0023]
In the embodiment, tlie end flange 16 is a flange formed at ends i11 the
longitudi~lal direction of the web part 11, the ridge 19, and the wall part 12, aud is
30 formed continuously along the web part 11, the ridge 19, and the wall part 12. The
end flange 16 like this includes a ridge flange 14 forlued at the elid of the ridge 19.
The end flange 16 is formed continuously to the web part 11, the ridge 19, and the
wall part 12 via a rising curved surface portion 18.
[0024]
In the e~nbodimentt, he unit joint 17 based on welding is provided over the
5 entire length of the part in contact with tlic tunnel member 3 of the end flange 16.
That is, of the end flange 16 sholvn in FIG. 3, in the part where the unit joint 17 is not
formed, the elid flange 16 is apart from the ttunuel member 3 (see FIG. 2). The unit
joint 17 like this is provided in a position adjacent to the bounda~yp ortion S between
the end flange 16 and the rising carved surface portion 18.
10 [0025]
The method of welding is not particularly limited, but is preferably a
welding method in which welding can be performed continuously while the joint
structure body 1 is moved relatively, such as laser welding, laser arc hybrid welding,
laser brazing, or arc welding. Laser arc hybrid welding it1 which the tolerance to
15 the gap is high and high-speed welding is possible may preferably be used.
[0026]
Here, the floor cross ~nenlber 10 is formed by, for example, performing
pressing such as bending or drawing on a blank material. At this time, the ridge 19
is formed by, after or while bending at1 end of the blank nlaterial which forms the end
20 flange 16, bending the blank material, with the surface on the opposite side to the
bending direction of the end flange 16 set inside. To enhat~ce the mechanical
properties of the joint structure body 1 of the floor cross member 10 and the tunnel
member 3, the unit joint 17 is preferably formed in a position near the rising curved
surface po~tion 18, that is, so as to include or be adjacent to the boundary portion S
25 between the rising curved surface portion 18 and the end flange 16. To this end, it
is desired to reduce the curvature radius Rf of the rising curved surface portion 18 at
the root portion of the end flange 16.
[0027]
I-Iowevel; the smaller the curvature radius Rf of the rising curved surface
30 portion 18 is designed, the more likely it is that, when the blank material is beut
along the ridge 19, cracking will occur at the end of the ridge flange 14 on the
opposite side to the rising curved surface portion 18 side, or large wrinkling wvill
occur in the rising curved surface portion 18 at the root of the ridge flange 14. Such
cracking and large wrinkling are 111ore likely to occur, when the sheet thickness of the
blank material is larger or the tension of the blank material is larger, Therefore, in
6 the case where the end flange 16 including the ridge flange 14 is formed at the end of
the floor cross member 10, it is difficult to reduce the curvature radius Rf of the
rising curved surface portion 18 to the limit.
[0028]
In FIG. 4, a situation in wl~icha, t the end of the web part 11, the end flange
10 16 is formed co~ltinuouslyto the web part 11 via the rising curved surface portion 18
is shown. In the joint 15 at the end of the web part 11, one surface of the end flange
16 is placed to overlap the joining target surface of the tunnel tnember 3, and at least
one part of the one surface is in contact with the tunnel tnember 3. In the example
shown in FIG. 4, the entire one surface of the end flange 16 excluding the rising
15 curved surface portion 18 is in contact with the tunnel member 3. The unit joint 17
is provided adjacent to the boundary portion S between the rising curved surface
portion 18 and the end flange 16.
[0029]
When the end flange 16 is formed by simply bending the blank material, it
20 is likely that elongation of the blank material will occur in the portion to be formed
into the rising cui-ved surface po~tion1 8, and the sheet thiclu~essw ill become smaller
than the sheet thickness of the blank material. That is, a tendency in which the
sheet thickness of the rising curved surface portion 18 formed at the end of the web
part 11 and the end of the wall part 12 is reduced with respect to the sheet thickness
25 of the blank material is seen. Although not illustrated, also at the end of the wall
part 12, the unitjoint 17 is provided adjacent to the boundary portion S between the .
rising cunred surface portion 18 and the end flange 16 as sho\vn in FIG. 4.
[0030]
FIG. 5 shows a situation in wvhich, at the end of the ridge 19, the ridge flange
30 14 is formed continuously to the ridge 19 via the rising cur\~ed surface portion 18.
Also in the joint 15 at the end of the ridge 19, one surface of the ridge flange 14 is
placed to overlap tlie joining target surface of tlie tunnel ~iletnber3 , and at least one
part of tlie one surface is ia contact with the tunnel nietilber 3. 111 tlie esample
shown in FIG. 5, the entire one surface of the ridge flange 14 excluding tlie rising
curved surface portion 18 is in contact with tlie tunnel member 3. At this time, tlie
5 rising cul-ved surface portion 18 formed at the end of the ridge 19 is formed as a
wall-thickened portion 20 of which the sheet thickness is made larger than the sheet
thickness of the blank material for forniing tlie floor cross member 10.
[0031]
In the rising cusved surface portion 18 fonned at the root of the ridge flange
10 14, the material of the blank material flows in or wrinkling occurs, and thereby the
sheet thickness becomes larger than tlie sheet thickness of the blank tnaterial. In
FIG. 5, a situatio~in wl~ichth e sheet thickness is increased with respect to the sheet
thickness of the original blank material (broken line) is shown. Tlie larger the rate
of wall thickening that indicates the ratio of the thickness of the wall-thickened
15 portiot~2 0 to the sheet thickness of the blank tnaterial is, the smaller the curvature
radius Rf in the wall-thicketled portion 20 is. As described above, to prevent
cracking at the end of the ridge flange 14 and large wrinkling at the root portion,
although there is a limit to reduce the curvature radius Rf of the rising curved surface
portion 18 at the root of the end flange 16, the wall-thicketled portion 20 is formed at
20 the root portion of the ridge flange 14. Therefore, the curvature radius Rf of the
wall-thickened portion 20 becomes stnaller than those of other portions.
[0032]
Thus, by providing the unit joint 17 in such a manner that the unit joint 17
includes the boundary portion S befiveen the wall-thickened portion 20 like this atid
25 the ridge flange 14 or is adjacent to the boundary portion S, tlie unit joint 17 is placed
in a positioll nearer to the center position P of the bending of the rising c u ~ ~ e d
surface portion 18. Thereby, tlie mechanical properties of tlie joint stn~ctureb ody 1
of the floor cross member 10 and the tunnel member 3 are itnproved. In particular,
the ridge 19, u~liich is a bent portion located between the web part 11 and the \\all
30 part 12, is a gostion in charge of tlie load when a collisio~lio ad is inputted in the axial
direction. Thos, by tlie unit joint 17 being provided adjacent to the wall-thickened
portion 20 at the end of the ridge 19 in the rising curved surface portion 18, the
collision load is transferred to the ridge 19 efficientl): and the absorbed energy
efficiency can be finfher improved.
[0033]
5 FIG. 6 and FIG. 7 are diagralns for describiug an example of the press
. molding that molds the floor cross member 10 having the end flat~ge 16 formed
continuously from the web part 11 thsough the ridge 19 to the wall part 12. FIG. 6
is a perspective view showing a punch 21 1, a die 212, and a ridge pushing pad 213 of
a press molding apparatus, and FIG. 7 is a perspective view showing a situation in
10 which a black rnaterial B is pressed against the punch 211 by the ridge pushing pad
213.
[0034]
In such an example, as shown in FIG. 7, the blank material B is bent by the
die 212 in a state where the blank material B is pressed against the punch 21 1 by the
15 ridge pushing pad 213 and the ends of the portion to be molded into the web part 11
and the portion to be molded into the ridge 19 are restrained. Thereby, the end
flange 16 including the ridge flange 14 is formed while the c~rrvaturera dius Rfof the
rising curved surface portion 18 is reduced and the cracking at the end of the ridge
flange 14 on the opposite side to the rising curved surface portion 18 side is
20 suppressed.
[0035]
At this time, in the rising cuwed surface portion 18 at the end of the ridge
19, although the occurrence of sigtlifica~lt wrinkling is suppressed, the sheet
thich~essi s increased due to the inflow of the material of the blank material B and
25 the oecurreuce of wrinkling, and the wall-thickened portion 20 is formed. I11 the
wall-thickened portion 20 like this, the curvature radius Rf of the rising cmved
surface portiot~ 18 is small as compared to portions not wall-thickened. Thereby,
the boundary portion S between the rising curved surface portion 18 and the ridge
flange 14 is brought closer to the center position P of bending.
30 LO0361
FIG. 8 is a contour figure showing the sheet thickness distribution of the end
flange 16 including the ridge flange 14 and the rising cnrved surface portion 18. As
shown in FIG. 8, the sheet thickness of the end of the ridge flange 14 on the opposite
side to the rising cul-ved surface portion 18 side is reduced; 011 the other hand, the
sheet thickness of the rising curved surface portion 18 at the root portion of the ridge
5 flange 14 is increased.
[0037]
FIG. 9 is a graph in which the rate of decrease in the sheet thickness (%) of
the ends of the web part 11, the ridge 19, and the \ d l part 12 is shown along the
distance of the way from the web part I1 through the ridge 19 to the wall part 12.
10 The ends of the web part 11, the ridge 19, and the wall part 12 correspond to the
rising starting position of the rising curved surface portion 18. The case where the
rate of decrease in the sheet thickness (%) shows a negative value indicates that the
sheet thickness is increased. As shown in FIG. 9, it can be seen that, at the ends of
the web part 11 and the wall patt 12, the rate of decrease in the sheet thickness (%) is
15 generally positive val~lesa nd the sheet thickness is reduced; on the other hand, at the
end of the ridge 19, the rate of decrease in the sheet thickrless (%) is negative values
and the sheet thickness is increased.
[0038]
That is, inthe joint structure body 1 according to the embodiment, at least
20 one part of the unit joint 17 is formed adjacent to the boundary portion S between the
wall-thickened portion 20 of the rising curved surface portion 18 and the ridge flange
14. As described above, in the xvall-thickened portion 20, the curvature radius Rf of
the rising curved surface portion 18 is sinall as compared to other portions; and the
ridge flange 14 is in contact with the tunnel metnber 3 in a position near the center
25 position P of the bending of the rising curved surface portion 18. Thus, by the unit
joint 17 beingprovided adjacent to the boundary portion S betwveen the ridge flange
14 and the wall-thickened portion 20, the ridge flange 14 and the tunnel member 3
are joined in a position nearer to the end of the ridge 19.
[0039]
30 The unit joint 17 that joins the end flange 16 includit~gth e ridge flange 14
and the tunnel member 3 is provided so as to include a range of 3 mm or less fronl
the boundary poltion S between the end flange 16 and the rising curved surface
portion 18. That is, in the case where the end flange 16 is configured so as to be in
surface contact with the tunnel member 3, tlie unit joint 17 is forn~ed such that at
least one part of the unit joint 17 is included in a range of 3 nim or less from the part
5 wliere the end flange 16 first comes into contact with the tunnel member 3 on the
rising curved surface portion 18 side. In tlie exati~ples of FIG. 4 and FIG. 5, the
distance L from the boundary portion S between tlie end flange 16 or the ridge flange
14 and the rising curved surface portion 18 to the unit joint 17 is 0 IIIIII.
[0040]
10 Thereby, the torsional rigidity and the absorbed energy properties in axial
crushing of the joint structure body 1 can be improved reliably. As illustrated later,
the unit joint 17 may be placed nearer to the side of the web part 11, tlie ridge 19, and
the wall part 12, than to the boundaly pottion S between the rising curved surface
portion 18 and the end flange 16 or the ridge flange 14. By the unit joint 17 being
15 placed in such a position, the torsional rigidity and the absorbed energy properties in
axial crushing can be improved stably. In particular, by tlie unit joint 17 being
provided adjacent to the wall-thickened portion 20 at the end of the ridge 19 in the
rising curved surface portion 18, the collision load is traasferred to the ridge 19
efficiently, and the absorbed energy efficiency can be further improved.
20 [0041]
In the case wliere the floor cross member 10 and the tunnel member 3 are
joined by welding, welding may be performed fiom the elid- flange 16 side, or
welding may be performed from the tunnel member 3 side. As the welding method
in this case, laser arc hybrid welding is preferable.
25 [0042]
-As desciibed above, in the joint structure body -1 according to the
embodiment, tlie unit joint 17 is provided so as to include at least a range of 3 tnm or
less from tlie boundary portion S betweeti the end flange 16 or the ridge flange 14
and the rising curved surface portion 18. Therefore, the floor cross ~nember 10 and
30 the tunnel member 3 are joined near the position wliere the end flange 16 and the
ridge flange 14 first cotne illto contact with tlie tunnel tiiember 3 on the rising curved
surface portion 18 side, and the torsional rigidity and tlie absorbed energy properties
in axial crushing of the joint structure body 1 can be iniproved.
[0043]
Furthermore, in the joint structure body 1 according to the embodimnent, the
5 unit joint 17 is provided to include a range of 3 mn or less from the boundary
portion S between the wall-thickened portion 20 formed at the end of the ridge 19 in
the rising curved surface portion 18 and the ridge flange 14. Therefore, the load is
efficiently transferred to the ridge 19, which is in charge of the collision load in the
axial direction, and the absorbed energy properties in axial crushing are further
10 improved.
[0044]
13. Modification examples>
Hereinabove, the joint st~ucture body 1 according to an enibodiment is
described; but the configuration of the joint 15 is not limited to the example of the
15 embodiment described above. Some nlodification exatnples of the joint will now be
described. The configuration of tlie portions other than the joint may be a similar
configuration to the embodi~netlt described above, and herein only the joint is
described.
[0045]
20 (3-1. First modification exanlple)
FIG. 10 is a diagram showing a joint 25 according to a first modification
example, and shows a cross-sectional vie\v of the joint 25. FIG. 10 is a diagrani
corresponding to FIG. 5, and shows a cross-sectional view of the joint portion
between the ridge flange 14 and the tunnel member 3.
25 [0046]
,- The joint 25 according to the first inodification.exanlp1e is an example in
bvluch a unit joint 27 is fornied in the wall-thickened portion 20 adjacent to the
boundary po~-tion S between the wall-thickened portion 20 and the ridge flange 14.
Altl~oougnl~o t illustrated, also at the ends of the web part 11 and the wall part 12, the
30 unit joint 27 may be formed in the rising curved surface portion 18 adjacent to the
boundary portion S between the rising curved surface portion 18 and the end flange
16.
[0047]
Also in the joint 25 like this, the unit joint 27 is provided in a range in which
the distance L from the boundary portio~i S between the wall-thickened portion 20
6 with its cu~vatnre radius Rf reduced and the ridge flange 14 is 3 tnnl or less.
Thereby, the torsiotlal rigidity and tlie absorbed energy propel-ties of axial crushing of
the joint stlucture body 1 are improved. In particular, since the unit joint 27 is
formed by utilizing the wall-thickened portion 20 formed at the end of the ridge 19 it1
charge of the collision load, tlie collision load is transferred to the ridge 19 eficie~itly,
10 and the absorbed energy properties of axial c~ushirigc an be improved.
[0048]
Furthermore, in tlie joint 25 according to the first modification example,
since the uuit joint 27 is formed at the position of the rising curved surface postion 18,
tlie floor cross meniber 10 and the tunnel member 3 are joined on the extension lines
15 of the web part 11, the ridge 19, and the wall part 12. In the joint 25, since the floor
cross member 10 and the tunnel member 3 are joined on the extension line of the
ridge 19, the collision load is transferred to the ridge 19 efficiently. Therefore, the
torsional rigidity and the absorbed energy properties of axial crushing of the joint
structure body 1 are further iniproved.
20 [0049]
(3-2. Second modification example)
FIG. 11 is a diagram showing a joint 35 according to a second modificatio~i
example, and shows a cross-sectional view of the joint 35. FIG. 11 is a diagram
corresponding to FIG. 5, and shows a cross-sectional view of the joint postion
25 between the ridge flange 14 and the tunnel member 3.
[OOSO] ',
The joint 35 according to the second modification example is an example in
which a unit joint 37 is provided in the inside portion sandwiched by the floor cross
member 10 and the tumiel tnembcr 3, across tlie boundary portion S between the
30 wall-thickened portion 20 and the ridge flange 14. Although not illustrated, also at
the ends of the web part 11 atld the all part 12, the unit joint 37 may be fortlied in
the inside portion sandwicl~ed by the floor cross ~ne~nb1e0r and thc tunnel member 3,
across the boundary portion S between the rising c~uved surface portion 18 and the
end flange 16.
[0051]
5 In the joint 35 like this, the unit joint 37 is provided so as to include the
boundary portion S between the udl-thickened portion 20 with its curvature radius
Rf reduced and the ridge flange 14. That is, the distance L from the boundary
pol-tiot~S between the wall-thickened portion 20 and the ridge flange 14 to the unit
joint 37 is 0 nun. Thereby, the torsional rigidity and the absorbed energy properties
10 of axial crushing of the joint structure body 1 are improved. In particular, since the
unit joint 37 is formed by utilizing the wall-thickened portion 20 forn~eda t the end of
the ridge 19 in charge of the collision load, the collision load is transferred to the
ridge 19 eficientl): and the absorbed energy properties of axial crushing are
improved.
16 [0052]
Furthermore, in the joint 35 according to the second n~odificatioe~xl ample,
since the unit joint 37 is formed at the position of the rising curved surface portion 18,
the floor cross member 10 and the tunnel member 3 are joined on the extension lines
of the web part 11, the ridge 19, and the wall part 12. In the joint 35, since the floor
20 cross member 10 and the tunnel inetnber 3 are joined on the extension line of the
ridge 19, the collision load is transferred to the ridge 19 efficiently. Therefore, the
torsional rigidity and the absorbed energy properties of axial crusl~ing of the joint
structure body 1 are fifurther improved.
[0053]
25 (3-3. Third modification example)
FIG. 12 is a diagram showing a joint 45 according to a third tnodification
example, and shows a cross-sectional view of the joint 45. FIG. 12 is a diagram
corresponding to FIG. 5, and sho\vs a cross-sectional view of the joint portiot~
between the ridge flange 14 and the tunnel member 3.
30 [0054]
The joint 45 according to the third n~odificatione xan~pleis an exan~plei n
wvIiic11 a unit joint 47 is formed by brazing. The unit joint 47 based on brazing like
this is formed in the inside portion sand\viclied by the rising curved surface portion
18 and the tunnel mentber 3, and the unit joint 47 is provided adjacent to the
boundary portion S between the rising cu~vedsu rface portion 18 and the ridge flange
5 14. Although not illustrated, also at the ends of the web part I1 and the wall pal* 12,
the unit joint 47 based on braziug nay be formed in the inside portio~sl andwiched by
the rising curved surface portion 18 and the tunnel metnber 3.
[0055]
In the joint 45 like this, the unit joint 47 is provided in a range in ~vhichth e
10 distance L from the boundary portion S between the wall-thickened portion 20 with
its curvahlre radius Rf reduced and the ridge flange 14 is 3 rnm or less. In FIG. 12,
the distance L is 0 trim. Thereby, the torsional rigidity and the absorbed energy
properties of axial crnshitlg of the joint struch~reb ody lare imnproved. In particular,
since the unit joint 47 is formed by utilizing the wall-thickened portion 20 formed at
15 the end of the ridge 19 in charge of the collision load, the collision load is transferred
to the ridge 19 efficientlj; and the absorbed energy properties of axial crushing are
improved.
[0056]
Furthermore, in the joint 45 according to the third modification example,
20 since the unit joint 27 is formed at the position of the rising curved surface portion 18,
the floor cross iiletnber 10 and the tunnel member 3 are joined on the extension lines
of the web part 11, the ridge 19, and the wall part 12. Ln the joint 45, since the floor
cross metnber 10 atld the tunnel member 3 are joined on the extension line of tlle
ridge 19, the collision load is transferred to the ridge 19 efficiently. Therefore, the
25 torsional rigidity and the absorbed energy properties of axial cl.ushing of the joint
structure body 1 are flirther improved.
[0057]
(3-4. Fout-th tnodification example)
FIG. 13 is a diagram showing a joint 55 according to a fourth nlodification
30 example, and shows a cross-sectional view of the joit~t 55. FIG. 13 is a diagram
,corresponding to FIG. 5, and sho\vs a cross-sectiotlal vie\<, of the joint portion
between the ridge flange 14 and the tunnel membcr 3.
[0058]
The joint 55 according to the fourth modification example is an example it1
\vlvhich a unit joint 57 is formed by sticking with an adhesive. The unit joint 57
5 based 011 an adhesive like this is formed over the area \\!here the rising curved surface
portion 18 and the ridge flauge 14, and the t~llmelm ember 3 face each other, and the
unit joint 57 is provided to include the boundary portion S between the rising curved
surface pol-tion 18 and the ridge flange 14. That is, the distance L from the
boundary portion S between the wall-thickened portion 20 and the ridge flange 14 to
10 the unit joint 57 is 0 mm. Although not illustrated, also at the ends of the web part
11 and the wall part 12, the unit joint 57 based on an adhesive may be formed in the
area where the rising curved surface portion 18 and the end flange 16, and the tunnel
member 3 face each other.
[0059]
15 In the joint 55 like this, the unit joint 57 is provided so as to include the
boundary portio~lS between the wall-thickened portion 20 with its curvatu~er adius
Rf reduced and the ridge flange 14. Thereby, the torsio~lalr igidity and the absorbed
energy properties of axial crushing of the joint structure body 1 are improved. In
particular, since the unit joint 57 is formed by utilizing the wall-thickened portion 20
20 formed at the end of the ridge 19 in charge of the collision load, the collision load is
transferred to tlie ridge 19 efficiently, and the absorbed energy properties of axial
crushing are improved.
[0060]
Furthermore, in the joint 55 according to the fourth modification example,
25 since the unit joint 27 is formed at the position of the rising curved surface portion 18,
tlie floor cross member 10 and the tunnel member 3 are joined on the extension lines
of the web part 11, the ridge 19, and the wall part 12. 111 the joint 55, since the floor
cross member 10 and the tunnel member 3 are joined on the extension line of the
ridge 19, the collision load is transferred to the ridge 19 efficiently. Therefore, the
30 torsional rigidity and the absorbed energy properties of axial crushing of the joint
structure body 1 are fi~rtheirm proved.
[0061]
(3-5. Fifth modification example)
FIG. 14 is a diagram showing a joint 65 according to a fifth modification
example, and shows a view of the joint 65 in a planar view. FIG. 14 is a diagram
5 corresponding to FIG. 3, and is a view of a horizontal cross section of the floor cross
member 10 as viewed facing tlie joint 65 side.
[0062]
In the joint 65 according to the fifth modification exanlple, unit joints 67 are
formed intermittently. The unit joint 67 is formed so as to include a range in which
10 the distance L fiom tlie boundary portion S between the wall-thickened portion 20 at
the end of the ridge 19 and the ridge flange 14 is 3 mni or less. Thus, the unit joint
67 does not need to be formed contint~ously over the entire length of the part in
contact with the tunnel member 3 of the end flange 16 including the ridge flange 14,
and may be formed intermittently. The unit joints 67 are preferably formed such
15 that the total length of the unit joints 67 is 50% or more of the entire length of the
portion in contact with tlie tunnel member 3 of the end flange 16. As the specific
configuration of tlie unit joint 67, the configuration of the unit joint according to each
embodiment and each modification example described above may be selected as
appropriate.
20 [0063]
(3-6. Sixtli modification example)
FIG. 15 is a diagram showing a joint 75 according to a sixth modification
example. FIG. 15 is a diagram corresponding to FIG. 2, and shows a perspective
view of the joint 75.
25 [0064]
The joint 75 according to the sixth modification example is a joint in v,~hich
the joint 15 of the joint structure body 1 according to the enlbodiment described
above is further provided with spot welding portions 76. In tlie joint 75 according
to the sixth modification exa~nple,f irst, the end flange 16 and tlie tunnel niember 3
30 are fixed by the spot welding portions 76, and therefore the shape is stabilized.
Thereby, a unit joint 77 can easily be provided adjacent to the boundary portion S
between the rising curved surface portion 18 and the end flange 16, and fu~-ther~nore
the defor~nationw hen a bellding load is applied to the joint 75 can be suppressed to a
low level. In this case, by providing the ridge flange 14 with the spot welding
portion 76, the collision load can be transferred to the ridge more efftcientlj: and the
5 absorbed energy properties of axial crushing can be improved. As the configuration
of the unit joint 77, the configuration of the unit joint according to each embodiment
and each modification cxa~npled escribed above tnay be selected as appropriate.
[0065]
Also by the joint structure body having the joint according to each
10 modification example described above, the torsional rigidity and the absorbed energy
properties in axial c~-usl~incagn be improved.
[0066]
Hereinabove, preferred embodiments of tlie present invention are described
in detail with reference to the appended drawings; however, the present invention is
15 not litnited to such examples. It is clear that a person who has a comnlon
knowledge in the technical field to which the present invention pertains can arrive at
various alterations and tnodifications within the technical idea described in the scope
of claims; such alteratiot~sa nd modifications should be seeti as within the technical
scope of the present invention as a matter of course.
20 [0067]
For example, although tlie above elnbodiment is described using a second
member with a hat-like horizontal cross section as an example, the present invention
is not limited to such an exaniple, and the secotld member may be configured with an
arbitrary horizontal cross section. For example, the present invention can be
25 applied also to a second ruetnber having a gutter-like cross seetioil without including
the longitudinal flanges13. ..
[0068]
Furtherlnore, although in the above embodiment the wall-thickened portion
20 is formed at the end of the ridge 19 in the rising curved surface portion 18, the
30 presetit invention is not litnited to such an example. For example, in the case where
the wall-thickened portion is provided at the ends of the web part 11 and the wall part
12 in the rising curved surface portion 18, the unit joint may be provided so as to
include a range in w11ic11 the distance L from the boundary portion S between the
wall-thickened portion and the end flange 16 is 3 nnn or less. Also in the case
where the unit joint is thus provided, the first member and the second member can be
5 joined by utilizi~iga n area at the end of the web part 11 or the wall part 12 where the
curvature radius Rf of the rising curved surface postion 18 is small and the boundary
portion S between the rising cunred surface portion 18 and the end flange 16 is near
the center position P of bending.
LO0691
10 Furthern~ore, although the above embodiment is described using as an
example the case where the end flange 16 of the floor cross inember 10 as the second
member is joined to a prescribed surface of the tunnel member 3 as the first member,
the present invention is not limited to such an example. For example, joint structure
bodies 1A and 1B like those sho~vnin FIG. 16 and FIG. 17 are possible.
15 [0070]
In the joint structure body 1A shown in FIG. 16, a second member 10A is
joined to a first member 3A in a state where an end flange 16Aa formed at the end of
the wall part 12 of the second ~ne~nb1e0rA is kept in contact with a web past 7 of the
first member 3Aand an end flange 16Ab formed by extending the web part 11 of the
20 second member 10A is caught on a wall part 8 of the first member 3A. In the joint
structure body 1A like this, a unit joint 17Aa is provided adjacent to the boundary
portion between a rising curved surface portio~l 18A of the second member 10A and
the end flange 16Aa. The unit joint 17Aa like this joins the second member 1OA to
the web part 7 of the first menlber 3A.
25 [0071]
Further, in the joint structure body IA, a unit joint 17Ab, is provided
adjacent to the boundary portion between a ridge 9 and the wall pal* 8 of the first
lnetnber 3A. The unit joint 17Ab like this joins the second member 1OA to the wall
part 8 of the first lnetnber 3A. In the joint structure body 1A like this, the second
30 lnelnber 10A is produced by, after the elid flange 16 is once formed as shown in FIG.
2, bending the endflange 16 formed at the end of the web part 11. Therefore, the
rising curved surface portion 18A includes a wall-thickened portion 20A. By
providing the unit joint 17Aa adjacent to the boundary portion between the wallthickened
portioti 20A and the end flange 16Aa, the torsional rigidity and the
absorbed energy properties in axial crushing of the joint strncture body 1A can be
5 improved.
[0072]
In the joint structure body 1B show~lin FIG. 17, a second member 10B is
joined to a first me~nber3. B in a state kvhere an end flange 16B formed at the ends of
the web part 11 and the wall part 12 of the second tnenlber 10B is kept in contact
10 with the web part 7 of the first tne~nber3 B. The end flange 16B formed at the end
of the web part 11 of the second member IOB is bent so as to correspond to the shape
of the ridge 9 of the first member 3B. Also in the joint st111cture body 1B like this, a
unit joint 17B is provided adjacent to the boundary portion between a rising curved
surface portion 18B and the end flange 16B of the second member 10B.
15 [0073]
The unit joint 17B joins the second member 10B to the web part 7 of the
first tnetnber 3B. The unit joint 17B is provided also in a positio~ia djacent to the
ridge 9 of the first member 3B. Also in the joint structure body 113 like this, the
rising curved surface portion 18B is configured so as to include a wall-thickened
20 portion 200, and the unit joint 17B is provided adjacent to the bo~nldary portion
between the wall-thickened portion 20B and the end flange 16B; thereby, the
torsional rigidity and the absorbed energy properties in axial crushing of the joint
structure body 1B can be improved.
25 [Examples]
[0074] .
Examples of the present invention will liow be described.
[0075]

30 First, in evaluation 1, a member having a horizontal cross-sectional shape of
an 80 mm x 80.111111 rectaligular hollow cross section and a length of 500 rnnl \vas
etivisioned as the second member, and the properties of joint strocturc bodies in
wwliicl~ various joints weerc fornled on the member were evaluated by nu~nerical
calculation. The curvature radius Rp of the corner of the rectangular 11ollow cross
section corresponding to the ridge was set to 10 mnnl. As the property values of the
5 second niembel; the values of the mechanical properties of a high-tensile steel sheet
with a sheet thickness of 1.4 mln and a tensile strength of the 590-MPa class were
used.
[0076]
(Example 1)
10 In a joint 85 of a joint structure body of Example 1, as showvn in FIG. 18, an
end flange 86 was provided over the entire length of the outer periphery of the end of
a member 81, and a unit joint 87 continuing over the entire length of the end flange
86 was formed. Here, the width W of the end flange 86 was 20 rnni, the curvature
radius Rf of the rising curved surface portion between the member 81 and the end
15 flange 86 was 5 mln, and the curvature radius Rf of the rising curved surface portion
between the member 81 and a ridge flange 84 was 4 mm. The unit joint 87 had the
configuration shown in FIG. 4 or FIG 5, and the distance L fro111 the boundaly
portion S between the rising curved surface portion and the end flange 86 to the unit
joint 87 was 3 mm.
20 FIG. 18 is a view of the member 81 as viewed facing the end flange 86 side.
[0077]
(Example 2)
111 Example 2, the same configuratio~a~s Exatnple 1 was used except that the
distance L mentioned above was set to 1 mm.
25 [0078]
(Example 3)
In Example 3, the same configuration as Example 1 was used except that the
configuration show\rn in FIG. 10 was used as the unit joint and tlie distance L
nlentioned above was set to 2 mm.
30 [0079]
(Example 4)
A joint 105 of a joint structure body of Exatltple 4 had a config~uation
similar to the configuration of Exariiple 2; but as sliow~ilt 1 FIG. 19, four ~uiijto ints
107 were provided itlter~l~ittentlsyo as to correspond to the position of the ridge
flange 84. The four unit joints 107 were arranged in the four corners of the end
5 flange 86, each with a length of 40 mni. That is, in Example 4, the range of 50% of
the entire length of the end flange 86 was welded.
[0080]
(Comparative Example 1)
A joint 95 of a joint structure body of Co~llparative Example 1 had a
10 configuration similar to tlie configuration of Example 2; but as sho\vn in FIG. 20,
four unit joints 97 were provided intermittently along the elid flange 86, and a unit
joint was not provided in the position corresponding to the ridge flange 84. The
four unit joints 97 were arranged on the four straight-lined sides of tlie end flauge 86,
each with a length of 40 iim. That is, in Comparative Example 1, the range of 50%
15 of the entire length of the end flange 86 was welded.
[0081]
(Comparative Example 2)
A joint 115 of a joint structure body of Comparative Exaruple 2 had a
configuration similar to the co~ifigurationo f Example 1; but as shown in FIG. 21, an
20 end flange 116 was notched it1 the corners, and a ridge flange did not exist. hi the
end flange 116, a unit joint 117 was provided over the entire length of the end flange
-1 16. The distance L fiom the boundary portion S between the rising curved surface
portion and the end flange 116 to tlie unit joint 117 was set to 3 mm.
[0082]
25 (Conlparative Example 3)
.*. A joint of a joint structure body of Corllparative Example 3 was a similar
configuration to Cotnparative Example 2 except that the distance L mentioned above
was set to 1 iim.
[0083]
30 (Comparative Exaniple 4)
In a joint 125 of a joint structure body of Comparative Example 4, as sho\vn
in FIG. 22, an end flange 126 running over the entire periphery was provided, and the
end flange 126 was provided with eight spot \velding pol-tio~ls1 27. The distance L
from the boundary portion S between the rising curved surface portion and the end
flange 126 to the spot welding portion 127 was 7.5 mm.
6 [0084]
(Comparative Exanlple 5)
A joint of a joint stluch~re body of Comparative Example 5 bad a
configuration similar to the configuration of Example 4; but the distance L
mentioned above for, out of the eight spot welding portions 127, the four spot
10 welding portions 127 provided in ridge flanges 124 was set to 4.0 mm.
[0085]
(Evaluation method)
FIG. 23 is an illustratior~ diagram showing a method for evaluatit~g the
properties of the joint structure body of Examples and Comparative Examples.
15 Herein, in a state where each of both ends of the member was joined to a rigid-body
plate by the joint described in Examples and Comparative Examples mentioned
above, the torsional rigidity when one rigid-body plate wvas rotated as shown by
arrow N in FIG. 23 was evaluated. Further, in a state where both ends of the
. member were joined to rigid-body plates in the similar way, the axial crushing
20 properties wvhen one rigid-body plate wvas pressed so as to be compressed in the axial
direction as shown by arrow A in FIG. 23 were evaluated.
[0086]
(Results of evaluatio~l1 )
Table I shows the evaluation results. The torsional rigidity is expressed by
25 - the ~noment per degree of the torsion angle (N.mn/deg), and the axial crushing
--- properties are expressed by the absorbed energy (kJ) at amounts of the crushing
stroke of up to 5 mm. FIG. 24 and FIG. 25 show graphs of the torsio~lalr igidity and
the axial crushing properties based on Table 1. FIG. 24 shows the torsional rigidity
in each Example and Co~nparativeE xample, and FIG. 25 shows the axial crushing
30 properties in each Exa~nplea nd Comparative Example.
[0087] [Table 11
Ro.
I
1 8 1 1860 I 0.282 . I Comparative Example 4 1
2
3
4
5
6
7
-
I orsional rigidity
il\".mfdep)
1956
[OOSS]
As can be seen fiom Table 1, FIG. 24, and FIG. 25, tlie joint stmcture bodies
having the joints according to Exa~ilples have higher performance in both the
1962
2001
1943
1906
1855
1880
9 1 1849
5 torsional rigidity and the axial crushing properties than the joint st111cture bodies of
Comparative Examples.
Although in each Example and each Comparative Example the second
Axial cg-usliing pr-opprtips
ikJi
0.292
member was configured as a member having a rectangular hollow cross section for
easier calculation, a similar tendency is exhibited also in the case w11ere the second
10 member has a hat-like or gutter-like cross section.
[0089]

Exarnple 1
0 292
0 369
0 288
0 290
0173
0173
0.284
Next, in evaluation 2, a joint structure body of a configuration similar to tlie
configuration of the joint structure body of Example 2 mentioned above was used,
15 and tlie curvature radius Rf of the rising curved surface portion of the end flange was
Example 2
Exaniple 3
Exaniple 4
Comparative Example 1
Comparative Exa~~ip2l e
Cotnuarative Exaniule 3
Cotitpar-ative Example 5
varied; and the differences between the properties of the joint structure bodies weere
evaluated by numerical calculation. The,envisioned shape of tlie second member,
the property values, and the method for evaluating the torsional rigidity and tlie axial
crushing properties were the same as the conditions of evaluation 1.
20 [0090]
Herein, the cul-vature radius Rf of the rising curved surface portion formed
over the entire length of the outer periphery of the end of the member was set to five
values of 1 mil, 3 m~n5, mln, 8 mm, and 12 mm. Further, the unit joint was set in
the range of 1 inln from the boundary portion S between each rising curved surface
portion and each end flange in the end flange direction.
[0091]
5 (Results of evaluation 2)
FIG. 26 and FIG. 27 show the axial crushing properties. FIG. 26 shows the
relationship between the anlount of the crushing stroke (mm) and the absorbed
energy (kJ) for each curvature radius Rf, and FIG. 27 shows the absorbed energy (kJ)
at amounts of the crushing stroke of up to 5 tntn for each curvature radios Rf. FIG.
10 28 and FIG. 29 show the torsiotial rigidity. FIG. 28 shows the relationship between
the torsion angle (deg) and the moment (N.111) for each curvature radius Rf, and FIG.
29 shows the moment per degree of the torsion angle (Nddeg) for each curvature
radius Rf.
[0092]
15 As can be seen from FIG. 26 and FIG. 27, by reducing the curvature radius
Rf of the rising curved surface portion and forming the unit joint adjacent to the
boundary portion S between the rising curved surface portion and the end flange, the
axial crushing properties are improved. On the other hand, as can he seen from FIG.
28 and FIG. 29, the torsiotial rigidity exhibits a minimnm value when the curvature
20 radius Rf of the rising curved surface portion is 5 mm, and the torsional rigidity is
improved by reducing or increasing the curvature radius Rf. Therefore, it can be
seen that, in order to itnprove both the axial crushing properties and the torsional
rigidity, it is preferable that the cunrature radius Rf of the rising curved surface
portion be reduced and the unit joint he formed adjacent to the boundary portion S
25 between the rising curved surface portion and the end flange.
Reference Signs Tist
[0093]
1 car body (joint structure body)
2 floor
3 tunnel rile~llber (first member)
4 floor member
10 floor cross ~nenlber(s econd member)
11 web part
12 wall part
13 longitndinal flange
14 ridge flange
15 joint
16 end flange
17 unit joint
I8 rising curved surface portion
19 ridge
20 wall-thickened portion
Rf curvature radius of rising curved surface portion
S boundary portion between rising curved surface portion and end flange
15 (ridge flange)
CLAIMS
Clainl 1
Ajoint structure body of members con~prising:
a first inember;
5 a second member, an end of the second member being thrust against a
surface of the first member; and
a joint that joins the first member and the second member,
wherein the joint includes an end flange that is formed continuously along
the end of the second member and of which at least one part overlaps the surface of
10 the first member and a unit joint that joins the end flange and the first member,
the end flange is fornled continuously to at least one part of the end of the
second member via a rising curved surface portion and the rising curved surface
pol-tion includes a wall-thickened portion of which a sheet thickness is made larger
than a sheet thickness of the second member, and
15 at least one part of the unit joint is provided in a range of 3 tnm or less from
a boundary between the end flange and the wall-thickeued portion.
Claim 2
The joint struch~reb ody of members according to claim 1, wherein
20 the second melnber has a substantially hat-like or gutter-like cross-sectional
shape,
the end flange includes a ridge flange formed at an end of a ridge between a
web part and a wall part fornling the substantially hat-like or gutter-like shape, and
the rising culved surface portion between the ridge and the ridge flange is
25 formed as the wall-thickened portion.
Claim 3
The joint struch~reb ody of tne~nbersa ccording to claim 2, wherein the unit
joint is formed continuously fko111 the end of the ridge to an end of at least one part of
30 the web part and the wall part continuing to the ridge.
Clairii 4
The joint structure body of me~libers according to any one of claims 1 to 3,
xvlierein the unit joint is for~iiedc ontinuously over an entire lengtll of one part of tlie
end flange, the part being in contact with the surface of tlie first illember.
5
Clai~i5i
. The joint structt~reb ody of members according to any one of claiiiis 1 to 3,
wherein nnit joints are for~lied internlittently in the end flange, and a length of the
wit joints is a length of 50% or more of an entire length of an area \xrl~ere the end
10 flange and the first nlember are in contact.
Claini 6
The joint structure body of members according to any one of claims 1 to 5,
wherein a spot welding portion is further provided in the joint.
15
Claitii 7
Tlie joint structure body of menibers according to any one of clai~lls1 to 6,
wherein the first member is a floor tnn~iel or a side sill of an automobile, and the
, , . .,
second rne~iiberi s a floor cross member.