JP5895390B2 - Body structure - Google Patents

Description

  The present invention relates to a vehicle body structure in which a heavy object is mounted on a floor panel of a vehicle body via a mounting member.

  A vehicle using compressed natural gas or the like as a fuel is loaded with a heavy object such as a fuel container in a luggage compartment at the rear of the vehicle body. Such a heavy object is mounted on the floor panel of the vehicle body via a mounting member such as a support frame.

  Patent Document 1 describes a vehicle body structure in which a fuel container is mounted behind a rear seat of a vehicle via a support frame. In this vehicle body structure, the pair of side members that extend in the vehicle front-rear direction and are disposed on both sides of the vehicle body in the vehicle width direction, the floor panel supported on the side members, and the above-mentioned fixed on the floor panel And a support frame.

  In this vehicle body structure, a bolt is inserted into a hole formed in each of the bracket, floor panel and support frame housed in the recess of the side member, and this bolt is screwed with a nut disposed (welded) on the back surface of the bracket. By doing so, the support frame is fixed to the floor panel.

JP-A-9-290648

  However, the fuel container increases in weight to ensure a large capacity. For this reason, in the vehicle body structure described in Patent Document 1, a load is transmitted from the fuel container to the support frame due to vibrations of the vehicle body that occur during traveling.

  In the above vehicle body structure, even when the floor panel and the bracket are welded, if the load acts in the peeling direction (in this case, the vehicle vertical direction) that peels the welded surfaces, the floor panel will crack and break. there is a possibility.

  In view of such a problem, an object of the present invention is to provide a vehicle body structure that can prevent a floor panel from being damaged when a load is applied.

  In order to solve the above problems, a typical configuration of a vehicle body structure according to the present invention is a vehicle body structure including a mounting member on which a heavy object is mounted and a floor panel of the vehicle body that supports the mounting member. A pair of side members disposed on both sides in the vehicle width direction, extending in the vehicle front-rear direction and having flanges projecting to the vehicle inner side, and a recess in which a part of the floor panel between the pair of side members is depressed downward; And a bent first reinforcement having one end overlapped with the flange of the side member and the floor panel and welded, and the other end overlapped and welded with the vertical wall of the recess.

  According to the above configuration, when the load transmitted from the heavy object to the mounting member due to the vibration of the vehicle body acts in the vertical direction of the vehicle, the direction in which the weld surfaces are peeled off at one end of the first reinforcement (peeling) Direction). However, at one end of the first reinforcement, the first reinforcement, the flange, and the floor panel are overlapped and welded, so that the strength is high. On the other hand, at the other end of the first reinforcement, only the first reinforcement and the floor panel are overlapped and welded, but the welding surface is along the vertical wall of the recess. For this reason, at the other end of the first reinforcement, a force acts in the shear direction of the weld surface and is dispersed. Therefore, damage to the floor panel when receiving a load can be prevented.

  The side member may have a groove portion that forms a closed cross section with the floor panel, and the vehicle body structure may further include a second reinforcement that is accommodated in the groove portion of the side member and welded to the side wall of the groove portion. Thereby, since the welding surface of a 2nd reinforcement and a side member is along the side wall of a groove part, a load acts on the shear direction of a welding surface, and is disperse | distributed. For this reason, the weld surface between the second reinforcement and the side member does not peel off due to the load. The strength is increased by the closed cross section formed by the side member and the floor panel.

  The mounting member has a bottom plate attached to the top surface of the floor panel, and a support frame that is connected to the bottom plate and supports a heavy object. The attachment point between the bottom plate and the floor panel is supported by the bottom plate. It is good to set in the vicinity of the joint location with the frame. As a result, the attachment point is set in the vicinity of the joint where a large load acts, so that the load is transmitted not only to the floor panel but also to the first or second reinforcement on the back surface of the floor panel. Therefore, the load is dispersed and the floor panel can be prevented from being damaged.

  Each of the first and second reinforcements may include a nut that is formed with a hole corresponding to the attachment point and is screwed into a bolt that is disposed on the back surface and is inserted into the hole. As a result, the mounting member can be attached to the vehicle body simply by inserting a bolt into the hole and screwing the nut together, so that workability can be improved.

  The recessed portion of the floor panel may be a spare tire storage portion. As a result, the other end portion of the first reinforcement is welded by using the vertical wall that is inevitably formed by the spare tire storage portion, so that no additional parts for forming the vertical wall are required, and the manufacturing cost is reduced. Can be suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle body structure which can prevent the damage of the floor panel at the time of receiving a load can be provided.

It is a figure which shows the vehicle body structure in this embodiment. It is a figure which expands and shows a part of vehicle body structure of FIG. It is a figure which decomposes | disassembles and shows a part of vehicle body structure of FIG. It is a figure which shows the AA cross section of the vehicle body structure of FIG. It is a figure which shows the vehicle body structure of a comparative example.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a diagram showing a vehicle body structure in the present embodiment. Fig.1 (a) is a figure which shows the state which looked at the vehicle body structure from the vehicle rear side. FIG.1 (b) is a figure which shows the mounting member which supports a heavy article. The vehicle body structure 100 is a so-called natural gas (CNG) vehicle that uses compressed natural gas as a fuel. As shown in FIG. 1A, the vehicle body structure 100 has a CNG cylinder (fuel container 104) in a cargo compartment 102 at the rear of the vehicle body. ) Is installed.

  The luggage compartment 102 is located behind the rear seat 106 and includes, for example, a rear floor 108, a spare tire storage portion 110, and a pair of rear floor side members (side members 112a and 112b). The rear floor 108 is a floor panel that forms the floor surface of the vehicle body. Spare tire storage section 110 is a recess formed by a part of rear floor 108 being depressed downward, and stores spare tire 114. The side members 112a and 112b are members that are disposed on the back side (lower surface) of the rear floor 108 and extend in the vehicle front-rear direction on both sides of the rear floor 108 in the vehicle width direction.

  The fuel container 104 is a heavy object that accommodates compressed natural gas, and is formed in a long cylindrical shape as shown in FIG. The fuel container 104 is arranged above the rear floor 108 and the spare tire 114 with the longitudinal direction set to the vehicle width direction via a mounting member (frame member 116). Bands 104a and 104b for holding the fuel container 104 by winding the container body are detachably attached to both sides of the fuel container 104 in the vehicle width direction.

  As shown in FIG. 1B, the frame member 116 includes bottom plates 118a and 118b and support frames 120a and 120b. The bottom plates 118a and 118b are placed and fixed on the rear floor 108. Holes 122a to 122d and 124a to 124d into which bolts described later are inserted are formed in the bottom plates 118a and 118b. The support frames 120 a and 120 b are connected to the bottom plates 118 a and 118 b to stand and support the fuel container 104. The support frames 120a and 120b are spanned between the bottom plates 118a and 118b, and are bent in the middle of the support plates 120a and 118b to correspond to the outer shape of the fuel container 104, and are fixed to the bands 104a and 104b. 126b are attached.

  Hereinafter, the vehicle body structure 100 for attaching the frame member 116 to the rear floor 108 will be described with reference to FIGS. FIG. 2 is an enlarged view showing a part of the vehicle body structure 100 of FIG. 3 is an exploded view of a part of the vehicle body structure 100 shown in FIG. 2 and 3, for the sake of convenience, members such as the rear floor 108 are shown in a transparent state. FIG. 4 is a view showing an AA cross section of the vehicle body structure 100 of FIG. However, in FIG. 4, the frame member 116 omitted in FIG. 3 is also shown.

  In addition to the above-described members, the vehicle body structure 100 includes, for example, as shown in FIG. 3, first reinforcements 130 and 132 bent in a substantially L shape and second reinforcements accommodated in the side members 112a and 112b. 134, 136. The side member 112a includes flanges 140 and 142 projecting to the inside of the vehicle, and a groove 144 that forms a closed section (see FIG. 4) together with the rear floor 108. The vehicle body structure 100 includes a side member 112b having a symmetric structure with the side members 112a, the first reinforcements 130 and 132, and the second reinforcements 134 and 136, respectively, with respect to the center line of the vehicle. A first reinforcement and a second reinforcement are provided.

  The spare tire storage portion 110 has a vertical wall portion 146 because a part of the rear floor 108 is a recess recessed downward. In addition, the vertical wall part 146 should just incline so that it may not be parallel to the rear floor 108, and does not necessarily need to follow a perpendicular direction.

  As shown in FIGS. 3 and 4, the first reinforcements 130 and 132 have one end portions 130 a and 132 a that overlap the lower side of the flanges 140 and 142 of the side member 112 a, and are further disposed on the upper side of the flanges 140 and 142. It overlaps with the rear floor 108. Here, in region B of FIG. 4 shown together with the one end portion 130a of the first reinforcement 130, spot welding is performed in a state where the first reinforcement 130, the flange 140 of the side member 112a, and the rear floor 108 are overlapped. ing.

  Further, the first reinforcement 130 is bent downward along the shape of the rear floor 108, and the other end portions 130 b and 132 b extend to the vertical wall portion 146 of the spare tire storage portion 110. It overlaps on the back side. Here, in the region C of FIG. 4 shown together with the other end portions 130b and 132b of the first reinforcement 130, the spot is formed in a state where the first reinforcement 130 and the vertical wall portion 146 of the spare tire storage portion 110 are overlapped. Welded.

  Further, as shown in FIG. 3, the first reinforcements 130 and 132 have holes 130d and 132d formed on the upper surfaces 130c and 132c, and nuts 130e and 132e are disposed on the rear surfaces of the upper surfaces 130c and 132c ( Welding).

  Bolts 150a and 150b are inserted into the holes 130d and 132d from above through holes 122a and 122b formed in the bottom plates 118a and 118b of the frame member 116 (see FIG. 2). The bolts 150a and 150b are screwed into nuts 130e and 132e disposed on the first reinforcements 130 and 132, respectively.

  The second reinforcements 134 and 136 are members accommodated in the groove 144 of the side member 112a. As shown in FIG. 3, holes 134b and 136b are formed in the upper surfaces 134a and 136a, and the upper surfaces 134a and 136a are formed. Nuts 134c and 136c are disposed (welded) on the back surface of 136a.

  The second reinforcements 134 and 136 include wall surfaces 134d and 136d bent downward from the upper surfaces 134a and 136a, and mounting surfaces 134e to 134g and 136e to 136f projecting from the wall surfaces 134d and 136d. The attachment surfaces 134e, 136e, 134f, and 136f are spot welded to the side walls 144a and 144b of the groove 144 of the side member 112a, respectively. The mounting surfaces 134g and 136g are spot-welded to the bottom portion 144c of the groove portion 144 of the side member 112a.

  Here, the rear floor 108 has a hole 152 that overlaps the hole 130d of the first reinforcement 130 and a hole 154 that overlaps the hole 134b of the second reinforcement 134, as shown in the AA cross section of FIG. Is formed. Bolts 150a and 150c are inserted into the holes 130d and 134b from above through the holes 122a and 122c of the bottom plate 118a of the frame member 116 (see FIG. 2). As shown in FIG. 4, the bolts 150 a and 150 c are screwed into nuts 130 e and 134 c disposed on the first reinforcement 130 and the second reinforcement 134. Note that the bolts 150b and 150d shown in FIG. 2 are screwed into nuts 132e and 136c arranged in the first reinforcement 132 and the second reinforcement 136, respectively.

  In this manner, the frame member 116 is easily attached to the rear floor 108 together with the first reinforcements 130 and 132 by coupling the bolts 150a and 150b and the nuts 130e and 132e. The frame member 116 is easily attached to the rear floor 108 together with the second reinforcements 134 and 136 by coupling the bolts 150c and 150d and the nuts 134c and 136c.

  The positions where the bolts 150a to 150d and the nuts 130e, 132e, 134c, and 136c are coupled to each other serve as attachment points for attaching the frame member 116 to the rear floor 108. As shown in FIGS. 2 and 4, the attachment point is set in the vicinity of the joint portion between the bottom plate 118 a and the support frame 120 a on the member 116, and the rear frame floor 108 and the first reinforcement 130, 132 or This is the position where the two reinforcements 134 and 136 overlap.

  Next, a case where the vehicle body structure 100 receives a load will be described with reference mainly to FIG. The load here is assumed to be, for example, a force acting in the vertical direction of the vehicle transmitted from the heavy fuel container 104 to the frame member 116 due to vibration of the vehicle body during traveling.

  In the region C including the other end portion 130b of the first reinforcement 130, a load acts in the direction indicated by the arrow E. For this reason, in the region C, the load acts in a direction (shear direction) in which the welding surfaces by spot welding are shifted along the surface direction. Here, the shear direction acting on the weld surfaces is generally a direction advantageous in terms of strength as compared to the peeling direction. That is, in the region C, the load is dispersed in a direction that is advantageous in terms of strength. Therefore, in region C, the welded state between the weld surfaces is maintained even when a load is applied, and damage to the rear floor 108 can be prevented.

  In the second reinforcement 134, a load acts in the direction indicated by the arrow F. On the mounting surfaces 134e and 134f spot-welded to the side walls 144a and 144b of the groove 144 of the side member 112a, a load acts in the shear direction of the welding surface. For this reason, on the attachment surfaces 134e and 134f of the second reinforcement 134, the load is dispersed in a direction that is advantageous in terms of strength, the welded state is maintained, and damage to the rear floor 108 can be prevented. In the mounting surface 134g spot welded to the bottom portion 144c of the groove 144 of the side member 112a, the load acts in the peeling direction of the welding surface, but most of the load is received by the mounting surfaces 134e and 134f. Will not encourage.

  In the region B including the one end portion 130a of the first reinforcement 130, a load acts in the direction indicated by the arrow D. For this reason, in the region B, a load acts in a direction (peeling direction) in which the welded surfaces by spot welding are peeled off in the vertical direction. Spot welding is fragile with respect to a load acting in the peeling direction and generally tends to cause welding peeling. However, the welding surface here is a state where the first reinforcement 130, the flange 140 of the side member 112a, and the rear floor 108 are overlapped as described above, and the welding strength is high.

  Therefore, in the region B, the welded state is maintained even when a load is applied even though the frame member 116 is in the vicinity of the attachment point for attaching the frame member 116 to the rear floor 108, and the rear floor 108 is prevented from being cracked and damaged. it can.

  Hereinafter, a vehicle body structure of a comparative example will be described with reference to FIG. FIG. 5 is a diagram showing a vehicle body structure of a comparative example. Here, as in FIG. 3, a member such as the rear floor 108 is seen through. In addition, in the figure, the same code | symbol is attached | subjected to the same member as the member shown to this embodiment, and description is abbreviate | omitted suitably.

  The vehicle body structure 100A of the comparative example does not use the first reinforcements 130 and 132, and uses a side member 200 in which a flange projecting on the vehicle interior is partially enlarged instead of the side member 112a. Different from the vehicle body structure 100.

  In addition to the flanges 202 and 204 projecting from the groove 144 in which the second reinforcements 134 and 136 are accommodated and welded to the side member 200, the side member 200 further projects from the flanges 202 and 204 to the interior of the vehicle. Enlarged flanges 206 and 208 are formed. Nuts 210 and 212 are welded to the back surfaces of the enlarged flanges 206 and 208 as shown.

  In the vehicle body structure 100A of the comparative example, for example, bolts 150c and 150d shown in FIG. 2 are screwed into the nuts 134c and 136c arranged in the second reinforcements 134 and 136, respectively. Further, in the vehicle body structure 100A, bolts 150a and 150b are screwed onto nuts 210 and 212 welded to the enlarged flanges 206 and 208, respectively. In this manner, in the vehicle body structure 100A, the frame member 116 is fixed to the rear floor 108. Further, in the vicinity of the nuts 210 and 212 welded to the enlarged flanges 206 and 208, spot welding is performed in a state where the rear floor 108 and the enlarged flanges 206 and 208 are overlapped.

  Here, the case where the vehicle body structure 100A receives the load from the frame member 116 will be described. In the second reinforcements 134 and 136, as described above, the load is distributed in a shearing direction that is advantageous in terms of strength with respect to the welded surface subjected to spot welding. However, at the enlarged flanges 206 and 208 of the side member 200, a load acts in the peeling direction on the welded surface subjected to spot welding in the vicinity of the welded nuts 210 and 212.

  For this reason, in the vehicle body structure 100 </ b> A, when a load is applied, the welded surfaces on which the rear floor 108 and the enlarged flanges 206 and 208 are overlapped may be separated, and the rear floor 108 may be cracked and damaged.

  Further, in the vehicle body structure 100A, since the enlarged flanges 206 and 208 are formed on the side member 200, the yield deteriorates. Furthermore, in the vehicle body structure 100A, when separately creating the side member 200 having the enlarged flanges 206 and 208 and the side member 112a that does not require the enlarged flanges 206 and 208, separate molds are required, and the mold cost, etc. Costs increase.

  In contrast, in the vehicle body structure 100 of the present embodiment, as described above, the first reinforcement 130 that connects the flanges 140 and 142 of the side member 112a to the vertical wall portion 146 of the spare tire storage portion 110 of the rear floor 108 is connected. 132 are disposed on the back side of the rear floor 108. In the region B including the one end portions 130a and 132a of the first reinforcements 130 and 132, the load acts in the peeling direction (arrow D) as shown in FIG. However, in the region B, spot welding is performed in a state where the first reinforcements 130 and 132, the flanges 140 and 142 of the side member 112a, and the rear floor 108 are overlapped, and the welding strength is high.

  In the region C including the other end portions 130b and 132b of the first reinforcements 130 and 132, spot welding is performed in a state where the first reinforcements 130 and 132 and the rear floor 108 are overlapped, and the welding strength is region B. Low compared to However, in region C, the load acts in the shear direction (arrow E), and the weld surfaces do not peel off.

  For this reason, in the vehicle body structure 100, even if an excessive load transmitted from the frame member 116 due to the vibration of the vehicle is received, the rear floor 108 can be prevented from being cracked and broken.

  Further, as described above, the vehicle body structure 100 is provided with the second reinforcements 134 and 136 that are accommodated in the groove portion 144 of the side member 112a that forms a closed section together with the rear floor 108 and are welded to the side wall of the groove portion 144. For this reason, a load acts on the welding surface between the second reinforcements 134 and 136 and the side member 112a in the shearing direction (arrow F) and is dispersed, so that the welding surfaces are not separated from each other. The strength is increased by the closed cross section formed by the side member 112a and the rear floor 108. Thus, in the vehicle body structure 100, the rear floor 108 can be prevented from being damaged also by the second reinforcements 134 and 136.

  Further, in the vehicle body structure 100, as described above, the attachment point for attaching the frame member 116 to the rear floor 108 is set in the vicinity of the joint between the bottom plates 118a and 118b and the support frames 120a and 120b. In the vicinity of this coupling point, a position where a large load acts is provided. For this reason, in the vehicle body structure 100, the load is transmitted not only to the rear floor 108 but also to the other members, that is, the first reinforcements 130 and 132 or the second reinforcements 134 and 136 by setting the attachment points in the vicinity of the joining points. It becomes easy to be done. As a result, the load is dispersed and the rear floor 108 can be prevented from being damaged.

  In the vehicle body structure 100, as described above, the nuts 130e, 132e, 134c, and 136c are disposed on the back surfaces of the upper surfaces 130c, 132c, 134a, and 136a of the first and second reinforcements 130 and 132 and 136, respectively. did. For this reason, in the vehicle body structure 100, the bolts 150a to 150d are inserted into the holes 130d, 132d, 134b, and 136b of the first reinforcements 130 and 132 and the second reinforcements 134 and 136, respectively. In the vehicle body structure 100, the frame member 116 can be attached to the rear floor 108 only by screwing the bolts 150a to 150d and the nuts 130e, 132e, 134c, and 136c, and the workability is high. In addition, compared with the conventional structure which welds a nut directly to the back surface of the rear floor 108, the rear floor 108 does not receive an excessive load, and damage to the rear floor 108 can be prevented.

  Further, in the vehicle body structure 100, as described above, the other end portions 130b and 132b of the first reinforcements 130 and 132 are attached using the vertical wall portion 146 that is inevitably formed in the spare tire storage portion 110 of the rear floor 108. Welding. For this reason, in the vehicle body structure 100, it is not necessary to prepare an additional part in order to form the vertical wall part 146, and a structure can be simplified and manufacturing cost can be held down.

  Furthermore, in the vehicle body structure 100, the flanges 140 and 142 of the side member 112a need to be formed with enlarged flanges 206 and 208 that are partially enlarged toward the vehicle interior, like the side member 200 of the vehicle body structure 100A shown in the comparative example. Absent. For this reason, in the vehicle body structure 100, regardless of whether or not the heavy fuel container 104 is mounted, the common side member 112a can be used, and the yield can be improved, the parts can be shared, and the mold cost can be reduced.

  In the above-described embodiment, the vehicle body structure 100 in which the fuel container 104 is mounted in the luggage compartment 102 behind the rear seat 106 has been described. However, the present invention is not limited to this, and a so-called two-seat vehicle body without the rear seat 106 may be used. It may be a vehicle body structure in which the fuel container 104 is mounted in a luggage compartment formed behind the seat.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  The present invention can be used for a vehicle body structure in which a heavy object is mounted on a floor panel of a vehicle body via a mounting member.

DESCRIPTION OF SYMBOLS 100 ... Car body structure, 102 ... Cargo compartment, 104 ... Fuel container, 106 ... Rear seat, 108 ... Rear floor, 110 ... Spare tire storage part, 112a, 112b ... Side member, 114 ... Spare tire, 116 ... Frame member, 118a, 118b ... bottom plate, 120a, 120b ... support frame, 130, 132 ... first reinforcement, 134, 136 ... second reinforcement, 130e, 132e, 134c, 136c ... nut, 140, 142 ... flange, 144 ... groove, 146 ... vertical wall, 150a, 150b, 150c, 150d ... bolt

Claims (4)

In a vehicle body structure comprising a mounting member on which a heavy object is mounted and a floor panel of the vehicle body that supports the mounting member,
A pair of side members disposed on both sides of the lower surface of the floor panel in the vehicle width direction, extending in the vehicle front-rear direction, and having flanges projecting toward the vehicle interior;
A recess in which a part of the floor panel between the pair of side members is depressed downward;
One end portion is bonded to overlap the flange and said floor panel of said side members further includes a first reinforcement which other end bent bonded overlaps the vertical wall of the recess,
The side member has a groove portion that forms a closed cross section with the floor panel,
The vehicle body structure further includes a second reinforcement housed in the groove portion of the side member and joined to the side wall of the groove portion and not overlapping the first reinforcement.
The mounting member is attached to the floor panel at different attachment points together with the first and second reinforcements. The mounting member includes a bottom plate attached to the top surface of the floor panel, and a support frame that is coupled to the bottom plate and supports the heavy object.
2. The vehicle body structure according to claim 1, wherein an attachment point between the bottom plate and the floor panel is set in the vicinity of a joint portion between the bottom plate and the support frame.   Each of the first and second reinforcements includes a nut that is formed with a hole corresponding to the attachment point, and that is arranged on the rear surface and is screwed with a bolt that is inserted into the hole. Item 3. The vehicle body structure according to Item 2.   The vehicle body structure according to any one of claims 1 to 3, wherein the concave portion of the floor panel is a spare tire storage portion.

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