JP5228732B2 - Panel joint structure - Google Patents

Description

  The present invention relates to a panel joint structure in which a panel member is joined to a skeleton part.

A plurality of beads extending diagonally rearward from the at least one side of the left and right floor frames of the floor panel toward the vehicle width center are formed side by side on the front and back of the vehicle body to prevent wrinkles from occurring on the floor panel at the time of collision A technique is known in which the joining state of the parts is ensured (see, for example, Patent Document 1).
JP 2005-67491 A JP 2007-320501 A JP-A-9-207826

  However, in the conventional technology as described above, since the surface shape of the floor panel is changed by forming the bead, there is a concern that the resonance frequency of the floor and the wind flow under the floor are affected.

  An object of the present invention is to obtain a panel joining structure in which joining between the panel member and the skeleton is easily ensured when the panel member is subjected to shear displacement.

The panel joint structure according to the first aspect of the present invention includes a panel member, a skeleton structure having a rectangular frame shape having four sides, each of the four sides of the skeleton structure, and the panel member in the skeleton structure. parallel to two sides from a specific corner angle when relative displacement in the longitudinal direction decreases the density of the junction of a particular portion located in the direction in which the pair was 4 5 ° in the direction of said relative displacement of the other A joining portion joined at a plurality of joining points spaced apart in the longitudinal direction on each side of the skeletal structure so as to be sparser than the density of the joining points at the portion.

  In the panel joint structure according to the first aspect, the portion of the panel member located inside the joint portion of the rectangular frame shape with the skeleton structure has a substantially rectangular plate shape. When the two parallel sides of the skeletal structure cause relative displacement in the longitudinal direction, the rectangular portion of the panel member (or the entire panel member) may have a pair of diagonal angles that are smaller in angle. The pair of diagonals are subjected to shear displacement so that the angle becomes large. When this shear displacement is a large displacement, the shear stress acting at the joint point between the panel member and the skeleton structure increases as the angle decreases closer to the corner.

Here, in this panel joint structure, due to the low density of bonding points in the direction of the shearing by the angle decreases corners or et 4 5 °, to support the load of the large tensile direction with respect to the junction point of the corner Fewer joint points to obtain. For this reason, in this panel joining structure, the shear load which acts on the joining point near the said corner | angular part is relieved.

  Thus, in the panel joint structure according to the first aspect, when the panel member is subjected to shear displacement, it is easy to ensure the joint between the panel member and the skeleton part (skeleton structure).

  The panel joint structure according to a second aspect of the present invention is the panel joint structure according to the first aspect, wherein the joint portion is formed by two sides forming corners that are diagonal to the specific corners in the skeleton structure. The specific portion is located between the longitudinal ends of either one, and the density of the junction points at the specific portion is less than the density of the junction points at the other portion of either of the two sides. It is configured.

  In the panel joint structure according to claim 2, the specific part is located between the longitudinal ends of any one of the two sides sandwiching the corner that is a diagonal of the corner, and the side on which the specific part is located is The density of the junction points at the specific site is sparse relative to the density of the junction points other than the specific site. For this reason, when a panel member receives a shear displacement, joining of this panel member and a frame structure (the above-mentioned corner) is easy to be secured.

A panel joint structure according to a third aspect of the invention includes a panel member, a first skeleton member and a second skeleton member arranged in parallel along a predetermined direction and spaced apart in the parallel direction, and the first The top side when the skeleton member and the panel member are joined at a plurality of joint points separated in the longitudinal direction of the first skeleton member, and the first skeleton member is displaced relative to the second skeleton member in the longitudinal direction. junction point located and the first joint portion which is an end junction, and said panel member and the second frame member, against the longitudinal direction of the first frame member from said end junction 4 5 Joined at a plurality of joint points separated in the longitudinal direction of the second skeleton member so that the density of the joint points at a specific portion located in the direction of ° is sparser than the density of the joint points at other portions. A second joint portion.

  In the panel joint structure according to the third aspect, the portion of the panel member positioned between the parallel first and second skeleton members has a substantially rectangular plate shape. When the first and second skeleton members are displaced relative to each other in the longitudinal direction, the rectangular portion of the panel member (or the entire panel member) may be a pair of diagonal angles in the rectangular portion. And the other pair of diagonals are shear-displaced so that the angle increases. When this shear displacement is a large displacement, the shear stress acting at the joint point between the panel member and the skeleton structure increases as the angle decreases closer to the corner.

Here, in this panel joining structure, the end joining point in the first joining part is located at one of the corners where the angle becomes smaller with the shear deformation described above. And this in the direction of the corner portion or et 4 5 ° for the density of the junction is low, a small number of bonding points capable of supporting a load of large tensile direction with respect to the junction near the corner portion. For this reason, in this panel joining structure, the shear load which acts on the joining point near the said corner | angular part is relieved.

  Thus, in the panel joint structure according to the third aspect, when the panel member is subjected to shear displacement, it is easy to ensure the joint between the panel member and the skeleton part (each skeleton member).

According to a fourth aspect of the present invention, a vehicle body floor structure includes a floor panel, a rocker extending in the vehicle longitudinal direction at an outer end in the vehicle width direction of the vehicle body, and extending in the vehicle longitudinal direction on the vehicle width direction inner side with respect to the rocker. A front and rear member member, a first cross member that extends in the vehicle width direction and bridges the rocker and the front and rear members, and a rear portion in the vehicle front and rear direction that extends in the vehicle width direction. A second cross member that bridges the rocker and the front and rear members on the side, an outer edge joint portion that joins the floor panel and the rocker at a plurality of joint points separated in the longitudinal direction of the rocker, the front and rear members and the second cross member and the floor panel, the density of the bonding point of the particular portion located in the direction of the against the junction of the foremost in the longitudinal direction of the vehicle 4 5 ° in the perimeter joints of other Part An inner side or a rear side joined portion joined at a plurality of joined points spaced in the longitudinal direction of the front and rear members or the second cross member so as to be sparser than the density of the joined points at .

  In the vehicle body floor structure according to claim 4, the floor panel joined to either the front or rear member or the second cross member at the inner side or the rear side joined portion at the outer side joined portion and the rocker, The part located inside the joint part of the rectangular frame shape with the front and rear members and the first and second cross members has a substantially rectangular plate shape. For example, when a backward displacement is input to the front and rear members, the rectangular portion (or the entire floor panel) of the floor panel is sheared. Due to this shear deformation, the corners of the rocker and the first cross member and the corners of the front and rear members and the second cross member become smaller in the rectangular portion of the floor panel. When the shear displacement is a large displacement at the joint point between the floor panel and the skeleton structure at the corner portion where the angle becomes small as described above, the acting shear stress becomes large.

Inner Here, in this vehicle body floor structure, the rocker and the outer side direction of the junction or et 4 5 ° forwardmost junction near the corner between the first cross member of the corner angle is reduced by the shearing Since the density of the joints at the side or rear joint is low, the number of joints that can support a large load in the tensile direction with respect to the front joint at the outer joint is small. For this reason, in this vehicle body floor structure, the shear load which acts on each junction of an outer edge junction part, especially the foremost junction is relieved.

  Thus, in the vehicle body floor structure according to the fourth aspect, when the panel member is subjected to shear displacement, it is easy to ensure the bonding between the floor panel and the frame portion (at least one vehicle frame member).

According to a fifth aspect of the present invention, a vehicle body floor structure includes a floor panel, a rocker extending in the vehicle longitudinal direction at an outer end in the vehicle width direction of the vehicle body, and extending in the vehicle longitudinal direction on the vehicle width direction inner side with respect to the rocker. A front-rear member, a first cross member extending in the vehicle width direction and extending between the rocker and the front-rear member, and a rear side in the vehicle front-rear direction extending in the vehicle width direction with respect to the first cross member A second cross member that bridges the rocker and the front and rear members, an inner side joint portion that joins the floor panel and the front and rear members at a plurality of joint points spaced in the longitudinal direction of the front and rear members, the said rocker or the first cross member and the floor panel, the density of the bonding point of the particular portion located in the direction of and against the vehicle longitudinal direction from the last junction 4 5 ° in the inner side joint of the other Part As a sparse than the density of the junction with, a, and an outer side or front side joint portion is joined by a plurality of bonding points spaced in the longitudinal direction of the rocker or the first cross member.

  In the vehicle body floor structure according to claim 5, the floor panel joined to either the front or rear member at the inner side joint portion and joined to either the rocker or the first cross member at the outer side or front side joint portion is a rocker, The part located inside the joint part of the rectangular frame shape with the front and rear members and the first and second cross members has a substantially rectangular plate shape. For example, when a backward displacement is input to the front and rear members, the rectangular portion (or the entire floor panel) of the floor panel is sheared. Due to this shear deformation, the corners of the rocker and the first cross member and the corners of the front and rear members and the second cross member become smaller in the rectangular portion of the floor panel. When the shear displacement is a large displacement at the joint point between the floor panel and the skeleton structure at the corner portion where the angle becomes small as described above, the acting shear stress becomes large.

Here, in this vehicle body floor structure, in the last direction of junction or et 4 5 ° of the inner side joint portion near the corner between the front and rear members and the second cross member of the corner angle is reduced by the shearing Since the density of the junction points at the outer side or the front side junction is low, the number of junction points that can support a large load in the tensile direction with respect to the last junction of the inner side junction is small. For this reason, in this vehicle body floor structure, the shear load which acts on each joint point of an inner edge junction part, especially the last joint point is relieved.

  Thus, in the vehicle body floor structure according to the fifth aspect, when the panel member is subjected to shear displacement, it is easy to ensure the bonding between the floor panel and the frame portion (at least one vehicle frame member).

A vehicle body floor structure according to a sixth aspect of the present invention includes a floor panel, a rocker extending in the vehicle longitudinal direction at an outer end in the vehicle width direction of the vehicle body, and extending in the vehicle longitudinal direction on the inner side in the vehicle width direction with respect to the rocker. A front-rear member, a first cross member extending in the vehicle width direction and extending between the rocker and the front-rear member, and a rear side in the vehicle front-rear direction extending in the vehicle width direction with respect to the first cross member A second cross member that bridges the rocker and the front and rear members, and the front and rear members or the second cross member and the floor panel, and the floor panel at a corner of the rocker and the first cross member; as the density of the bonding point of the particular portion located in the direction of the pair and 4 5 ° from the joining point in the vehicle longitudinal direction is sparse than the density of the junction at other parts of the front and rear member or the second An inner side or rear side joined portion joined at a plurality of joining points spaced apart in the longitudinal direction of the cross member, the rocker or the first cross member and the floor panel, the front and rear members and the second cross member as the density of the bonding point of the particular portion positioned from the junction points with the floor panel at the corner in the direction of the longitudinal direction of the vehicle in pairs and 4 5 ° is sparse than the density of the junction at other parts And an outer side or a front side joint part joined at a plurality of joint points spaced in the longitudinal direction of the rocker or the first cross member.

  In the vehicle body floor structure according to claim 6, it is joined to the front and rear members and the second cross member at the inner side or the rear side joint, and is joined to either the rocker or the first cross member at the outer side or the front side joint. In the floor panel thus formed, the portion located inside the rectangular frame-shaped joint portion with the rocker, the front and rear members, and the first and second cross members has a substantially rectangular plate shape. For example, when a rearward load is input to the front and rear members, the rectangular portion of the floor panel (or the entire floor panel may be sheared). Due to this shear deformation, the corners of the rocker and the first cross member and the corners of the front and rear members and the second cross member become smaller in the rectangular portion of the floor panel. When the shear displacement is a large displacement at the joint point between the floor panel and the skeleton structure at the corner portion where the angle becomes small as described above, the acting shear stress becomes large.

Here, in this vehicle body floor structure, the density of the bonding points of the inner side or the rear side joint in the rocker and the direction of the corner portion or et 4 5 ° between the first cross member is low, the junction of the corner portion On the other hand, the number of joint points that can support a load in a large tensile direction is small. In addition, since the density of the joints at the outer or front joints is low in the direction of 45 ° from the corners of the front and rear members and the second cross member, a large tensile load is applied to the joints at the corners. The number of joint points that can be supported is small. As a result, in the vehicle body floor structure, each joint point of the outer side or front side joint part and each joint point of the inner side or rear side joint part, in particular, each joint part of each corner part where the angle decreases with shearing. The acting shear load is relaxed.

  Thus, in the vehicle body floor structure according to the sixth aspect, when the panel member is subjected to shear displacement, it is easy to ensure the bonding between the floor panel and the frame portion (each vehicle body frame member).

  The vehicle body floor structure according to a seventh aspect of the present invention is the vehicle body floor structure according to any one of the fourth to sixth aspects, wherein each joint point of the joint is a joint point by spot welding.

In the vehicle body floor structure according to claim 7, the joint points by spot welding that may cause peeling due to shear are the corner portions of the rocker and the first cross member, and the front and rear members and the second cross as described above. by sparsely density of at least one pressurized et 4 5 ° the direction of junction of the corners of a member, easily junction is effectively ensured (maintained).

  As described above, the panel joint structure according to the present invention has an excellent effect that when the panel member is subjected to shear displacement, the joint between the panel member and the skeleton is easily secured.

  A vehicle body floor structure 10 as a panel joint structure according to an embodiment of the present invention will be described with reference to FIGS. Note that an arrow FR appropriately shown in the drawing indicates a forward direction in the vehicle longitudinal direction, an arrow IN indicates an inner side in the vehicle width direction, and an arrow OUT indicates an outer side in the vehicle width direction.

  FIG. 2 shows a schematic plan view of the main part of the vehicle body floor structure 10. As shown in this figure, the vehicle body floor structure 10 is configured by joining a floor panel 12 as a panel member to a skeleton structure 14 forming a part of the vehicle skeleton.

  The skeleton structure 14 in this embodiment includes a rocker (side sill) 16 as a first skeleton member that extends in the vehicle front-rear direction at the outer end in the vehicle width direction at the vehicle body lower portion (floor portion), and the vehicle width relative to the skeleton structure 14. A second skeleton member extending in the vehicle front-rear direction on the inner side in the direction or an under reinforcement 18 as a front-rear member is provided. The skeleton structure 14 includes a torque box 20 as a first cross member and a floor cross member 22 as a second cross member, each extending in the vehicle width direction. The torque box 20 spans between the front ends of the rocker 16 and the under reinforcement 18, and the floor cross member 22 bridges the intermediate portion in the front-rear direction of the rocker 16 and the rear end of the under reinforcement 18. .

  As described above, the skeleton structure 14 constitutes the frame-like skeleton portion 14A having a substantially rectangular frame shape in plan view. Further, the front end of the under reinforcement 18 is connected to the rear end of the front side member 24 whose front end is connected to a bumper reinforcement (not shown). Accordingly, when a frontal collision with the bumper reinforcement occurs, the rearward displacement Dc is input to the under reinforcement 18 via the front side member 24.

  Then, as will be described in detail later, the floor panel 12 is provided with respect to each of the rocker 16, the under reinforcement 18, the torque box 20, and the floor cross member 22 constituting the four sides of the frame-shaped skeleton portion 14A. ) It is joined at a plurality of joining points arranged along the longitudinal direction. As indicated by an imaginary line in FIG. 2, a substantially rectangular flat plate portion (inside the joint portion) joined to the frame-like skeleton portion 14 </ b> A in the floor panel 12 is referred to as a rectangular panel portion 12 </ b> A. In this embodiment, the rectangular panel portion 12A has a rectangular shape that is long in the vehicle front-rear direction with respect to the vehicle width direction.

  Hereinafter, the joint structure between the rectangular panel portion 12A and the frame-like skeleton portion 14A will be specifically described. In addition, the front and outer (between the rocker 16 and the torque box 20) and the rear inner (between the under reinforcement 18 and the floor cross member 22) in the rectangular panel portion 12A are 12FO and 12RI, respectively. In addition, the corners of the rear panel (between the rocker 16 and the floor cross member 22) and the front panel (between the under reinforcement 18 and the torque box 20) in the rectangular panel unit 12A are respectively referred to as 12RI and 12FO.

  In FIG. 1, a rectangular panel portion 12 </ b> A cut out from the floor panel 12 is shown in a plan view. As indicated by an imaginary line in this figure, when the backward displacement Dc is input to the under reinforcement 18, the rectangular panel portion 12 </ b> A receives a reaction force R on the rocker 16, and the under reinforcement 18 and the rocker Due to the relative displacement in the vehicle longitudinal direction (longitudinal direction) with respect to 16, the corners 12FO, 12RI forming a diagonal become smaller due to shear displacement, and the corners 12FI, 12RO forming another diagonal are subjected to shear displacement. It is set as the structure which deform | transforms so that an angle may become large.

  The rectangular panel portion 12A and the rocker 16 are joined by an outer vertical spot weld row 26 in which a plurality of spot welding points S are arranged along the vehicle longitudinal direction. The rectangular panel portion 12A and the under reinforcement 18 are joined by an inner vertical spot weld row 28 in which a plurality of spot welding points S are arranged along the vehicle longitudinal direction. The rectangular panel portion 12A and the torque box 20 are joined by a front lateral spot welding row 30 in which a plurality of spot welding points S are arranged along the vehicle width direction. The rectangular panel portion 12A and the floor cross member 22 are joined by a rear side spot welding row 32 in which a plurality of spot welding points S are arranged along the vehicle width direction.

  As described above, in the rectangular panel portion 12A that is long in the longitudinal direction of the vehicle, the front lateral spot weld row 30 and the rear lateral spot weld row 32 are configured such that a plurality of spot welding points S are positioned at substantially equal intervals.

  On the other hand, in the outer vertical spot welding row 26 and the inner vertical spot welding row 28, the interval D1 between the spot welding points S adjacent in the longitudinal direction in each specific range A is the interval between the spot welding points S in the range B other than the specific range. Greater than D2. In other words, the outer vertical spot weld row 26 and the inner vertical spot weld row 28 are configured such that the density of the plurality of spot welds S in the specific range A is lower (sparse) than in other ranges.

  The specific range A in the outer vertical spot weld row 26 is from the spot welding point S close to the corner 12RI of the rectangular panel portion 12A, specifically from the last spot weld point St located at the rearmost end of the inner vertical spot weld row 28. The inner longitudinal spot weld row 28 (under reinforcement 18), that is, a range including a portion where the angle formed with the vehicle longitudinal direction is located in a direction of approximately 45 °. More specifically, in the specific range A in the outer vertical spot weld row 26, the virtual straight line IL1 having an angle of 45 ° with the vehicle front-rear direction from the last spot weld point St is along the inner vertical spot weld row 28. With respect to the point C1 intersecting the virtual straight line IL2, it is set over a predetermined length on both the front and rear sides.

  On the other hand, the specific range A in the inner vertical spot welding row 28 is a spot welding point S close to the corner portion 12FO of the rectangular panel portion 12A, specifically, the foremost spot welding point located at the foremost end of the outer vertical spot welding row 26. From Sf, the outer vertical spot welded row 26 (rocker 16), that is, a range including a portion where the angle formed with the vehicle longitudinal direction is located in a direction of approximately 45 °. More specifically, in the specific range A in the inner vertical spot weld row 28, the virtual straight line IL3 having an angle of 45 ° with the vehicle front-rear direction from the front spot weld point Sf is along the inner vertical spot weld row 28. With respect to the point C2 intersecting the virtual straight line IL4, it is set over a predetermined length on both the front and rear sides.

  The set length of the specific range A and the distances D1 and D2 between the spot welding points S are the maximum displacement in the front-rear direction (design displacement) assumed to act on the front side member 24, as will be described later, and the spot welding point S. Is appropriately set according to the strength against shearing, the shear rigidity required for the entire joining structure of the frame-like skeleton portion 14A (skeleton structure 14) and the floor panel 12, and the like.

  In this embodiment, the outer vertical spot weld row 26 and the inner vertical spot weld row 28 have shear strength in the front-rear direction obtained by the configuration of the comparative example in which the intervals between the spot weld points S are equal. As described above, the interval D2 of the spot welding points S in the range B other than the specific range A is made smaller than the interval D in the comparative example. That is, the distance between adjacent spot welding points S in the vehicle body floor structure 10 is such that D1> D> D2 in relation to the distance D in the comparative example.

  In the vehicle body floor structure 10 described above, the outer vertical spot weld row 26 and the inner vertical spot weld row 28 correspond to the joint portion in the present invention. The outer vertical spot weld row 26 corresponds to one of the first joint portion and the second joint portion in the present invention, and the inner vertical spot weld row 28 corresponds to the other of the first joint portion and the second joint portion. Equivalent to. Therefore, the foremost spot welding point Sf and the last spot welding point St correspond to the end joint points in the present invention. Further, the outer vertical spot weld row 26 corresponds to an outer side joint portion in the present invention, and the inner vertical spot weld row 28 corresponds to an inner side joint portion.

  Next, the operation of the embodiment will be described.

  In a vehicle such as an automobile to which the vehicle body floor structure 10 having the above-described configuration is applied, when a frontal collision is reached, a backward displacement Dc in the vehicle front-rear direction is input to the under reinforcement 18 via the bumper reinforcement and the front side member 24. The Due to the displacement Dc, the rectangular panel portion 12A of the floor panel 12 has a portion (hereinafter referred to as “inner side 12B”) joined to the under reinforcement 18 in the inner vertical spot weld row 28 facing backward, that is, outer vertical spot welding. A portion joined to the rocker 16 in the row 26 (hereinafter referred to as “the outer side 12C”) is subjected to shear (see an arrow in FIG. 1) by being displaced relatively forward, and is shown by an imaginary line in FIG. It is transformed as described.

  That is, when the shape before deformation of the rectangular panel portion 12A is the rectangle (rectangular shape) shown in FIG. 1, the diagonal corner portions 12FO and 12RI become acute angles (smaller angles), and other diagonal shapes. The corner portions 12FI and 12RO forming the shape are deformed into a substantially parallelogram shape having an obtuse angle (larger angle). A shear load acts on each spot welding point S in the outer vertical spot weld row 26, the inner vertical spot weld row 28, the front side spot weld row 30, and the rear side spot weld row 32.

  Here, in the vehicle body floor structure 10, the distance D1 between the spot welding points S in the specific range A in the outer vertical spot weld row 26 is larger than the distance D2 in the range B other than the specific range A. The load acting on each spot welding point S of the inner vertical spot welding row 28, particularly the last spot welding point St is alleviated with respect to the shear load, and the joining at the last spot welding point St is easily maintained. Similarly, in the vehicle body floor structure 10, the interval D1 between the spot welding points S in the specific range A in the inner vertical spot weld row 28 is larger than the interval D2 in the range B other than the specific range A. The load acting on each spot welding point S of the outer vertical spot weld row 26, particularly the foremost spot welding point Sf, is alleviated with respect to the shear load, and the joining at the foremost spot welding point Sf is easily maintained.

  Hereinafter, this mechanism will be supplemented with reference to FIGS. It should be noted that the outer vertical spot weld row 26 and the inner vertical spot weld row 28 have the same joint maintenance mechanism for the foremost spot weld point Sf and the last spot weld point St (the outer vertical spot weld row 26 and the inner vertical spot weld row 28. Therefore, hereinafter, a mechanism for maintaining the joining mainly at the foremost spot welding point Sf of the outer vertical spot welding row 26 will be described below.

  In FIG. 5, the rectangular panel portion 12 </ b> A joined to the frame-shaped skeleton portion 14 </ b> A in the outer vertical spot welding row 100 and the inner vertical spot welding row 102 according to the comparative example in which the interval D of the spot welding points S is constant. A band plate model considered as a model constituted by a plurality of band plates 34 is shown. In the example of FIG. 5, the rectangular panel portion 12 </ b> A is assumed to be formed by connecting a specific spot welding point Sp of the outer vertical spot welding row 26 and another spot welding point S by a strip 34. In this model, the shear load acting on a specific spot welding point Sp can be grasped as the sum of the loads (vectors) of the strips 34. In addition, the strip | belt board 34 shown with a broken line in FIG. 5 shows 34 compressed by the shear of the above-mentioned rectangular panel part 12A, and the strip | belt board 34 shown with a continuous line is pulled 34 by the shear of the above-mentioned rectangular panel part 12A. Is shown.

  By the way, when the rectangular panel portion 12A is subjected to minute deformation, the rectangular panel portion 12A receives a load from each of the strip 34 to be compressed and the strip 34 to be pulled. On the other hand, when the rectangular panel portion 12A is greatly deformed by the shear due to the above-described collision, the compression-side strip 34 is slackened (buckled), and the generated compression load becomes extremely small (this is This corresponds to the occurrence of wrinkles in the floor panel 12 due to an actual collision). For this reason, in the case of the large deformation accompanying the shearing of the rectangular panel portion 12A, the shear load acting on the specific spot welding point Sp ignores the load from the compression side strip 34, and the tension side strip It can be considered as a resultant force (vector) of the load from 34.

  From FIG. 5, in the case of shear deformation in which the under reinforcement 18 (inner side 12 </ b> B) is displaced rearward relative to the rocker 16 (outer side 12 </ b> C), each spot welding of the outer vertical spot weld row 26 is performed. As the point S is located on the front side (the leading side in the relative displacement direction), the number of connected strips 34 on the tension side increases (the number of connected strips 34 that receive tension increases). I understand. That is, in the outer longitudinal spot weld row 100, the number of connected strips 34 on the tension side is maximized at the foremost spot weld point Sf located at the head in the relative displacement direction, and the acting shear load is maximized.

  FIGS. 6A and 6B show spot welding in the outer vertical spot weld row 26 calculated by applying the strip model of FIG. 5 to each spot welding point S in the outer vertical spot weld row 26. FIG. 6A shows a vector in plan view, FIG. 6B shows a load Fx in the vehicle longitudinal direction load (X direction), and a load in the vehicle width direction (Y direction). It is a diagram which shows Fy and these resultant force F. FIG. Also from this figure, it can be seen that, in the outer vertical spot weld row 26, the shear load acting on the spot welding point S located at the front increases.

  FIG. 7 shows a model in which a plurality of strips 34 are connected to the foremost spot welding point Sf of the outer vertical spot welding row 26. As shown in this figure, the strips 34 connected to the foremost spot welding point Sf all apply a tensile load to the foremost spot welding point Sf. It will be examined which of the plurality of strips 34 has a large load applied to the foremost spot welding point Sf.

  FIG. 8 shows the result of calculating the strain (that is, the load) for each strip 34 connecting the foremost spot welding point Sf and each spot welding point S in the inner vertical spot weld row 28 using the strip model shown in FIG. Show. The horizontal axis in FIG. 8 is along the vehicle longitudinal direction from the foremost spot welding point Sf with respect to the distance Lw (see FIG. 7) between the outer vertical spot weld row 26 and the inner vertical spot weld row 28 along the vehicle width direction. The separation distance X is shown. From this figure, in the case of X / Lw = 1, that is, the load exerted on the foremost spot welding point Sf by the strip 34 extending from the foremost spot welding point Sf in the direction of 45 ° with respect to the vehicle longitudinal direction is maximum. I understand.

  Supplementing this point, as shown in FIG. 9 (B), a strip plate 34 that connects the foremost spot welding point Sf and the spot welding point S that is separated from the foremost spot welding point Sf by a distance X in the front-rear direction, When the spot welding point S is displaced backward by dX along with the shear deformation of the rectangular panel portion 12A, the length increases from L to L + dL. When the strip 34 having the maximum strain (L + dL) / L accompanying this elongation applies the maximum load to the foremost spot welding point Sf, as shown in FIG. 9A, X / Lw = 1. The band plate 34 connected to the spot welding point S located at the point has the maximum strain due to the shear deformation. Moreover, it turns out that the load which acts on the foremost spot welding point Sf is reduced, so that it distances back and forth from the point used as X / Lw = 1.

  Here, in the vehicle body floor structure 10, since the density of the spot welding points S in the direction of about 45 ° from the foremost spot welding point Sf in the inner vertical spot welding row 28 is sparse, in other words, to the foremost spot welding point Sf. Since it can be understood that the strip 34 around 45 ° where the applied load is large is thinned out, the shear load acting on the foremost spot welding point Sf can be reduced.

  FIG. 3A shows a verification model of the vehicle body floor structure 10 for verifying this effect. FIG. 3B shows an outer vertical spot weld row 100 and an inner vertical spot weld row 102 according to the comparative example described above. A model of a vehicle body floor structure to which is applied is shown. FIG. 4A shows the result of calculating the shear load acting on each spot welding point S of the outer vertical spot weld row 26 in the strip model using the verification model of FIG. 3A. On the other hand, FIG. 4B is a result of calculating a shear load acting on each spot welding point S of the outer longitudinal spot weld row 100 in a strip model using the comparative example model of FIG. 3B. 4A and 4B, the vertical axis and the horizontal axis are the same scale.

  4A and 4B, in the vehicle body floor structure 10, the maximum shear load of the outer vertical spot weld row 26, that is, the shear load of the front spot weld point Sf is 10 compared to the comparative example. It can be seen that the percentage has declined by just over a percent.

  Therefore, in the vehicle body floor structure 10 according to the embodiment of the present invention, the shear load (stress) acting on the foremost spot welding point Sf when the rectangular panel portion 12A is sheared due to the applied frontal collision of the vehicle. It is relaxed and the joining at each spot welding point S of the outer vertical spot welding row 26 including the foremost spot welding point Sf is easily maintained. Similarly, in the vehicle body floor structure 10, when the rectangular panel portion 12 </ b> A is subjected to shear due to the frontal collision of the applied vehicle, the shear load (stress) acting on the last spot welding point St is alleviated, and the last spot Joining at each spot welding point S of the inner vertical spot welding row 28 including the welding point St is easily maintained.

  Moreover, in the vehicle body floor structure 10, the distance D2 of the spot welding points S in the range B other than the specific range A in each of the outer vertical spot weld row 26 and the inner vertical spot weld row 28 is the outer vertical spot weld row according to the comparative example. Since it is smaller than the interval D at 100, it is possible to ensure shear rigidity in an elastic region equal to or greater than that of the comparative example.

  Supplementing this point, as shown in FIG. 9 (A), the load Fx in the front-rear direction of each strip 34 connected to the foremost spot welding point Sf is a spot welding point located between X and Lw of 1 to 2. It can be seen that the strip 34 connected to S is the maximum. Therefore, by reducing the distance D2 between the spot welding points S in the above-described range B including the portion of X / Lw> 1, it contributes to the improvement of shear rigidity. In this embodiment, it has been confirmed that, while obtaining the effect of reducing the maximum shear load with respect to the comparative example, the shear rigidity in the front-rear direction equal to or greater than that can be obtained.

  In summary, in the vehicle body floor structure 10 according to the present embodiment, spot welding points are located within a specific range A of the inner vertical spot welding row 28 located approximately 45 ° from the foremost spot welding point Sf of the outer vertical spot welding row 26. Since the density of S is made sparse, the shear load acting on the foremost spot welding point Sf of the outer vertical spot weld row 26 at the time of frontal collision can be alleviated and the joining can be maintained. Similarly, since the density of the spot welding points S is sparse in the specific range A of the inner vertical spot weld row 28 located in the specific range A in the direction of about 45 ° from the last spot weld point St of the inner vertical spot weld row 28, The shear load acting on the last spot welding point St of the inner vertical spot weld row 28 during the frontal collision can be alleviated and the joining can be maintained.

  Moreover, in the vehicle body floor structure 10, since the density of the spot welding points S is made dense in the range B other than the specific range in the outer vertical spot weld row 26 and the inner vertical spot weld row 28, the required shear rigidity can be ensured. .

  In the vehicle body floor structure 10, the bonding of the floor panel 12 and the skeletal structure 14 is ensured without forming a bead or joining a reinforcing member to the rectangular panel portion 12 </ b> A of the floor panel 12. That is, in the vehicle body floor structure 10, the joining of the floor panel 12 and the skeleton structure 14 is ensured without affecting the resonance frequency, the wind flow under the floor, and the like by changing the shape of the floor panel 12.

  In the above-described embodiment, the example in which the rectangular panel portion 12A has a rectangular shape that is long in the vehicle front-rear direction with respect to the vehicle width direction has been described. However, the present invention is not limited to this, and for example, as shown in FIG. You may apply this invention with respect to the rectangular-shaped rectangular panel part 50 long in a vehicle width direction. In this case, the specific range A in the 45 ° direction with respect to the foremost spot welding point Sf is set in the rear lateral spot welding row 32, and the specific range A in the 45 ° direction with respect to the last spot welding point St is in the front lateral spot welding. It will be set in column 30. Also in the configuration according to this modification, the same effect can be obtained by the same operation as in the above embodiment. In this modification, the front lateral spot weld row 30 and the rear lateral spot weld row 32 correspond to the joint portion in the present invention. Further, the front lateral spot weld row 30 corresponds to the front side joint portion in the present invention, and the rear side spot weld row 32 corresponds to the rear side joint portion in the present invention.

  Further, in the above-described embodiment, an example in which the four sides of the rectangular panel portion 12A are joined to the frame-like skeleton portion 14A has been shown. However, the present invention is not limited to this, for example, as shown in FIG. In the rectangular panel portion 12A that is long in the direction, the outer vertical spot weld row 26 and the inner vertical spot weld row 28 are essential requirements, and the front lateral spot weld row 30 and the rear lateral spot weld row 32 are not considered as essential requirements. It is also possible to have a configuration that does not actually have the front lateral spot weld row 30 and the rear lateral spot weld row 32. That is, the pal member in the present invention is not limited to being grasped as being joined to the rectangular frame-like skeleton structure, and the rectangular portion located between the pair of skeleton members arranged in parallel in the panel member. The present invention can be applied to.

  Furthermore, the present invention is limited to being applied to the vehicle body floor structure 10 in which the floor panel 12 is joined to the skeleton structure 14 constituted by the rocker 16, the under reinforcement 18, the torque box 20, and the floor cross member 22. There is nothing, and it is applicable to various parts.

  Furthermore, in the above-described embodiment, an example in which the plurality of joint points are spot welding points S has been shown, but the present invention is not limited to this, and some or all of the plurality of joint points are spot welding points S. Instead, it may be configured as fastening means such as bolts and rivets.

  In the above-described embodiment, the outer vertical spot weld row 26, the inner vertical spot weld row 28, the front side spot weld row 30, and the rear side spot weld row 32 are examples in which the spot welding points S are arranged in a straight line. However, the present invention is not limited to this. For example, the spot welding points S may be arranged in a zigzag manner or in a plurality of rows.

1 is a plan view schematically showing a vehicle body floor structure according to an embodiment of the present invention. 1 is a plan view showing a schematic overall configuration of a vehicle body floor structure according to an embodiment of the present invention. The figure which shows the verification model for the numerical calculation of the vehicle body floor structure which concerns on embodiment of this invention, (B) is a figure which shows the calculation model of a comparative example. (A) is a diagram which shows the load which acts on each spot junction of the outer side vertical spot welding row | line | column in the vehicle body floor structure which concerns on embodiment of this invention, (B) is the outer side vertical in the vehicle body floor structure which concerns on a comparative example. It is a diagram which shows the load which acts on each spot junction of a spot welding row | line | column. It is a conceptual diagram of the strip model for calculating the load which acts on each spot junction of the outer side vertical spot weld row | line | column in the vehicle body floor structure which concerns on embodiment of this invention. It is a figure which shows the numerical calculation result using the strip model shown in FIG. 5, Comprising: (A) is a figure which shows the load vector of each spot joining point, (B) is a diagram which shows the load level of each spot joining point It is. It is a conceptual diagram of the strip model for calculating the tensile load of the some strip connected to a specific spot welding point. It is a diagram which shows the result of having calculated the load which acts on each strip using the strip model shown in FIG. (A) is a diagram which shows the result of having calculated the load which acts on a strip in a wider range than FIG. 8, (B) is a figure which shows typically a deformation | transformation of a strip. It is. It is a top view showing typically the body floor structure concerning the 1st modification of an embodiment of the present invention. It is a top view showing typically the body floor structure concerning the 2nd modification of an embodiment of the present invention.

Explanation of symbols

10 Car body floor structure (panel joint structure)
12 Floor panels (panel members)
14 skeleton structure part 16 rocker (first skeleton member, second skeleton member)
18 Under reinforcement (2nd skeleton member, 1st skeleton member)
20 dash cross member 22 floor cross member 26 outer vertical spot weld row (joint, first joint, second joint, outer joint)
28 Inner vertical spot weld row (joint, second joint, first joint, inner joint)
30 Front side horizontal spot weld row (joint, front joint)
32 Rear side spot weld row (joint, rear joint)
50 Rectangular panel (panel member)
S Spot welding point (joint point)
Sf Front spot welding point (end joint)
St Last spot welding point (end joint)

Claims (7)

A panel member;
A skeleton structure having a rectangular frame shape having four sides;
And each said panel member of the four sides of the framework structure, two sides parallel Shi pairs in the direction of said relative displacement from a specific corner angle decreases when displaced relative to the longitudinal direction of the framework structure 4 such that the density of the junction of a particular portion located in a direction forming a 5 ° is sparse than the density of the junction at other parts, spaced respective longitudinal direction at each side of the backbone structure A joint joined at a plurality of joint points;
Panel junction structure with   In the joint portion, the specific portion is located between end portions in the longitudinal direction of any one of two sides forming a corner portion opposite to the specific corner portion in the skeleton structure, and the specific portion The panel bonding structure according to claim 1, wherein the density of the bonding points at the point is made sparser than the density of bonding points at the other part of either one of the two sides. A panel member;
A first skeleton member and a second skeleton member arranged in parallel at a predetermined interval;
When the first skeleton member and the panel member are joined at a plurality of joint points separated in the longitudinal direction of the first skeleton member and are relatively displaced in the longitudinal direction with respect to the second skeleton member of the first skeleton member. A first joint where the joint located on the top side of the first end is the end joint;
And said panel member and the second frame member, a density of other parts of the junction of a particular portion located in the direction of the longitudinal pair and 4 5 ° of the first frame member from said end junction A second joining portion joined at a plurality of joining points spaced apart in the longitudinal direction of the second skeleton member so as to be sparser than the density of the joining points;
Panel junction structure with Floor panels,
A rocker extending in the vehicle longitudinal direction at the vehicle width direction outer end of the vehicle body,
Front and rear member members extending in the vehicle front-rear direction on the inner side in the vehicle width direction with respect to the rocker;
A first cross member that extends in the vehicle width direction and bridges the rocker and the front and rear members;
A second cross member that extends in the vehicle width direction and bridges the rocker and the front and rear members on the rear side in the vehicle front-rear direction with respect to the first cross member;
An outer side joint part that joins the floor panel and the rocker at a plurality of joint points spaced in the longitudinal direction of the rocker;
Said front and rear member or the second cross member and the floor panel, the density of the bonding point of the particular portion located in the direction of the against the junction of the foremost in the longitudinal direction of the vehicle 4 5 ° in the perimeter joints other An inner side or a rear side joined part joined at a plurality of joined points spaced apart in the longitudinal direction of the front and rear members or the second cross member so as to be sparser than the density of the joined points in the part of
Body floor structure with Floor panels,
A rocker extending in the vehicle longitudinal direction at the vehicle width direction outer end of the vehicle body,
Front and rear members extending in the vehicle front-rear direction on the inner side in the vehicle width direction with respect to the rocker;
A first cross member that extends in the vehicle width direction and bridges the rocker and the front and rear members;
A second cross member that extends in the vehicle width direction and bridges the rocker and the front and rear members on the rear side in the vehicle front-rear direction with respect to the first cross member;
An inner side joint portion that joins the floor panel and the front and rear members at a plurality of joint points spaced in the longitudinal direction of the front and rear members;
The said rocker or the first cross member and the floor panel, the density of the bonding point of the particular portion located in the direction of and against the vehicle longitudinal direction from the last junction 4 5 ° in the inner side joint of the other An outer side or a front side joined part joined at a plurality of joined points spaced apart in the longitudinal direction of the rocker or the first cross member so as to be sparser than the density of the joined points at the part;
Body floor structure with Floor panels,
A rocker extending in the vehicle longitudinal direction at the vehicle width direction outer end of the vehicle body,
Front and rear members extending in the vehicle front-rear direction on the inner side in the vehicle width direction with respect to the rocker;
A first cross member that extends in the vehicle width direction and bridges the rocker and the front and rear members;
A second cross member that extends in the vehicle width direction and bridges the rocker and the front and rear members on the rear side in the vehicle front-rear direction with respect to the first cross member;
Said longitudinal member or said second cross member and the floor panel, located in the direction of the longitudinal direction of the vehicle in pairs and 4 5 ° from the junction point between the floor panel at the corner portion between the rocker and the first cross member The inner parts joined at a plurality of joining points separated in the longitudinal direction of the front and rear members or the second cross member so that the density of the joining points of the specific part is sparser than the density of the joining points in the other parts. Side or rear side joint,
The rocker or the first cross member and the floor panel, located in the direction of the longitudinal direction of the vehicle in pairs and 4 5 ° from the junction of the floor panel and at the corners of the front and rear members and the second cross member The outer edge joined at a plurality of joint points separated in the longitudinal direction of the rocker or the first cross member so that the density of the joint points of the specific part is sparser than the density of the joint points in the other part. Or the front side joint,
Body floor structure with   The vehicle body floor structure according to any one of claims 4 to 6, wherein each joint point of the joint portion is a joint point by spot welding.

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