JP4923508B2 - Car body rear structure - Google Patents

Description

  The present invention relates to a vehicle body rear structure in which a container frame that supports a fuel container is attached to the lower surface of a vehicle, and a rear frame is attached to the lower surface of the vehicle on the vehicle rear side of the container frame.

  As a conventional vehicle body rear structure, for example, in Patent Document 1 below, a method of joining a subframe that supports a hydrogen tank as a fuel tank mounted on a fuel cell vehicle to left and right rear side members extending in the vehicle front-rear direction at the lower part of the vehicle. Is described. The subframe has a fuel tank mounted on the front part thereof, and a fuel cell mounted on a connecting part at the upper part of the front part and the rear part.

In addition, by providing a discontinuous part in the lower part between the front part and the rear part of the subframe, the subframe buckles and deforms when the vehicle receives an impact from the rear, and the rear side member buckles. Deformation is possible, and the shock absorbing function of the rear side member is ensured.
JP 2003-127907 A

  By the way, it is necessary to provide hydrogen-based functional parts such as hydrogen valves, which are peripheral parts, in the hydrogen tank. If this hydrogen-based functional part is placed in the area on the rear side of the hydrogen tank, the vehicle will impact from behind. When the subframe is buckled and received, the subframe moving forward due to this deformation approaches the hydrogen tank and interferes with the hydrogen functional parts. There is a problem that it cannot be installed in the area behind the tank vehicle.

  In view of the above, according to the present invention, even if the rear frame disposed on the rear side of the container frame on which the fuel container is mounted buckles and deforms, the deformed rear frame interferes with peripheral components disposed on the rear area of the fuel container on the vehicle. The purpose is not to.

The present invention attaches a container frame that supports a hydrogen tank to a lower surface of a vehicle, and has a pipe member that is lower in strength than the container frame and extends in the vehicle front-rear direction on the lower surface of the vehicle behind the container frame. attaching a rear frame comprising, a the rear frame and the container frame, connected by front and rear frame connecting member comprising the same intensity and the container frame, the rear of the hydrogen tank is a peripheral component that is included with the hydrogen tank functions The most important feature is the arrangement of parts.

According to the present invention, even if the rear frame is buckled and deformed due to an impact from the rear, the front and rear frame connecting members having high strength in the same manner as the container frame compared to the rear frame that is easily buckled and deformed, It is possible to protect the peripheral parts arranged in the area on the rear side of the hydrogen tank and prevent interference with the peripheral parts of the rear frame that buckles and moves forward.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 is a side view of a vehicle body rear structure according to an embodiment of the present invention, FIG. 2 is a perspective view of the vehicle body rear structure of FIG. 1 as viewed from below the vehicle body, and FIG. 3 is a bottom view of FIG. In addition, the direction shown by the arrow FR in each figure including the figure mentioned later is the vehicle front, the direction shown by the UPR is the vehicle upper side, and the direction shown by the LH is the left side of the vehicle. However, in these FIGS. 1 to 3, a rear under cover 19 and a hydrogen tank under cover 23 shown in FIG. 7 to be described later are omitted.

  The vehicle having the vehicle body rear structure described above may be, for example, a fuel cell vehicle equipped with a fuel cell (not shown), and the fuel cell vehicle here has a cylindrical shape as a fuel container for storing hydrogen to be supplied to the fuel cell as fuel. The hydrogen tank 1 is mounted below the rear floor panel 3 of the vehicle via a tank frame 5 as a container frame. 2 and 3, the hydrogen tank 1 is omitted.

  As shown in a perspective view in FIG. 4, the tank frame 5 is a frame structure having a shape that receives substantially the lower half of the hydrogen tank 1, and is positioned on one side of the hydrogen tank 1 on the vehicle front side of the cylindrical portion. A front frame 5a, a rear frame 5b located on the other side of the cylindrical portion on the rear side of the vehicle, and a hydrogen tank 1 that is bent forward from both ends in the vehicle width direction of the rear frame 5b and connected to the front frame 5a. Left and right side frames 5c and 5d located on the sides at both ends in the longitudinal direction, and front and rear lower frames 5e and 5f located below the hydrogen tank 1 between the front frame 5a and the rear frame 5b, respectively. Each of these frames is made of a hollow pipe material. The front and rear lower frames 5e and 5f are bent at both ends in the vehicle width direction and have their tips connected to the left and right frames 5c and 5d.

  The tank frame 5 has support frames 5g and 5h as container frame members formed in a substantially semicircular arc shape extending over the front and rear frames 5a and 5b and the front and rear lower frames 5e and 5f and extending in the vehicle front-rear direction. The hydrogen tank 1 is placed on the support frames 5g and 5h. Then, a metal belt (not shown) is put on the hydrogen tank 1, and both ends of the belt are fixed to the belt fixing portions 5i and 5j at the upper ends of the support frames 5g and 5h by using fasteners such as bolts, The hydrogen tank 1 is fixed to the tank frame 5.

  In this way, the tank frame 5 that accommodates and supports the hydrogen tank 1 forms side extension portions 5k that extend from both longitudinal ends of the front frame 5a to the upper side portion, and the end of the side extension portion 5k is connected to the vehicle body. A vehicle body front fixing portion 5m is formed as a fixing portion.

  The tank frame 5 includes rear extension frames 5n and 5p as container mounting arms extending from the same position in the vehicle width direction to the support frames 5g and 5h of the rear frame 5b to the rear upper part, and at the tips of the rear extension frames 5n and 5p. Then, the rear vehicle body fixing portion 5q which is a fixing portion to the vehicle body is formed. The rear extension frames 5n and 5p are made of a hollow pipe material.

  The vehicle body front fixing portion 5m is fixed to a rear side member 7 as a vehicle body skeleton member extending in the vehicle front-rear direction on both the left and right sides of the lower portion of the vehicle, and the vehicle body rear fixing portion 5q includes two rear parts on the vehicle body side. The cross members 9 and 11 (see FIGS. 2 and 3) are connected to a tank frame mounting member 12 as a cross member connecting member for connecting the members.

  The two rear cross members 9 and 11 described above extend in a state parallel to each other in the vehicle width direction, and both ends thereof are connected to the rear side member 7 to constitute first and second cross members, respectively. .

  With the above configuration, in this embodiment, the tank frame mounting member 12 serving as a cross member connecting member and the support frame 5g serving as a container frame member that supports the lower half of the hydrogen tank 1 in the tank frame 5 and extends in the vehicle front-rear direction. , 5h are set at the same position in the vehicle width direction, and the rear extension frames 5n, 5p that serve as container mounting arms extending from the same position in the vehicle width direction as the support frames 5g, 5h to the tank frame mounting member 12 The rear parts in the front-rear direction are connected.

A rear frame 13 is attached to the lower part of the vehicle on the vehicle rear side of the tank frame 5. As shown in the perspective view of FIG. 5, the rear frame 13 connects the front pipe 13a and the rear pipe 13b extending in the vehicle width direction with the front and rear pipes 13a and 13b, and the rear side of the vehicle is at the upper position. It is mainly composed of two connecting pipes 13c and 13d as rear frame members inclined so as to be.

  The front pipe 13a has a side extension 13e that is located on the vehicle front side and bends both longitudinal ends at the side upper part and slightly rearward, and a front fixing part 13f at the tip of the side extension 13e is provided. The rear side member 7 is fixed. Further, the vicinity of the tip of the side extension 13e and the center in the vehicle width direction of the front pipe 13a are connected by a substantially V-shaped reinforcing pipe 13g.

  The connecting pipes 13c and 13d have a bent portion 13h that is slightly bent downward in the vicinity of the front pipe 13a. The bent portions 13h are connected to each other by the auxiliary pipe 13i, and the auxiliary pipe 13i and the front pipe 13a are connected. A plate 13j is provided in a portion surrounded by the connecting pipes 13c and 13d.

  The rear pipe 13b is located on the vehicle rear side, has a side extension 13k that bends both longitudinal ends to the side upper part, and fixes a rear fixing part 13m at the tip of the side extension 13k to the rear side member 7. To do.

  The rear frame 13 configured as described above has a strength that is generally higher than that of the tank frame 5 by forming the pipe members constituting the frame thinner than the frame members of the tank frame 5 described above. When the rear side member 7 is buckled and deformed by receiving an impact from the rear by forming a notch 13n in the vicinity of the center in the longitudinal direction of the connection pipes 13c, 13d that is low and extends in the vehicle longitudinal direction, It is designed to be easily buckled and deformed.

  The tank frame 5 and the rear frame 13 are connected to each other by two front and rear frame connecting members 15 and 17 as shown in FIG. That is, the front ends of the front and rear frame connecting members 15 and 17 are connected to positions corresponding to the support frames 5g and 5h of the rear lower frame 5f in the tank frame 5, while the rear ends are connected to the front pipe 13a in the rear frame 13. It connects with the front bracket 13s which protrudes ahead of the position corresponding to these connection pipes 13c and 13d. The front and rear frame connecting members 15 and 17 described above are assumed to have the same high strength as the tank frame 5.

  Here, the front pipe 13a is disposed at substantially the same position in the vehicle front-rear direction with respect to the rear cross member 9 of the vehicle body described above. Therefore, the fixing portions of the rear ends of the front and rear frame connecting members 15, 17 with respect to the front pipe 13a are also provided. Thus, the longitudinal direction of the vehicle body substantially coincides with the rear cross member 9 as the first cross member.

  In addition, connecting pipes 13c and 13d, which are rear frame members extending in the vehicle front-rear direction of the rear frame 13, and front and rear frame connecting members 15 and 17 are connected to the support frames 5g and 5h which are container frame members of the tank frame 5. The same position in the width direction is set. That is, the support frames 5g and 5h, the connection pipes 13c and 13d, and the front and rear frame connection members 15 and 17 are positioned on the same straight line along the vehicle body front-rear direction.

Then, a rear under cover 19 shown as a perspective view in FIG. 7 is attached to the lower portion of the rear frame 13 so as to cover the lower portion of the rear frame 13. Rear undercover 19, foreign matter anticollision to the floor under the mounting part of a fuel cell vehicle and, since the eyes of the aerodynamic performance and appearance improvement, attachment provided at four positions in total of two central places and rear two positions The hole 19a is aligned with the mounting flange 13r provided on the side of the connecting pipes 13c and 13d of the rear frame 13, and a bolt (not shown) inserted from the mounting hole 19a is fastened to the nut 21 provided on the mounting flange 13r. Further, bolts (not shown) are inserted into the mounting holes 19b at the two front positions of the rear under cover 19 from below, and are fastened and fixed to nuts 22 provided on the plate 13j.

  The rear under cover 19 is bent so that the upper part of the vehicle has a projecting shape at a position slightly rearward of the mounting hole 19b in accordance with the bent shape of the bent portion 13h in front of the connecting pipes 13c and 13d in the rear frame 13. ing.

  Further, the front end portion of the rear under cover 19 is positioned slightly rearward of the vehicle front-rear direction center of the front and rear frame connecting members 15 and 17, and a rear end of a hydrogen tank under cover 23 described later is overlapped from below to form a screw hole 19c. Use and tighten bolts from below. On the other hand, the rear end portion and the rear side portion of the rear under cover 19 are fixed to a nut 19d set on the rear under cover 19 by overlapping the lower end of a rear bumper (not shown) on the vehicle body side from below and inserting bolts from the rear bumper side. To do.

  Further, a hydrogen tank under cover 23 as a container under cover shown in the perspective view of FIG. 7 is attached to the lower portion of the tank frame 5 so as to cover the lower side of the tank frame 5.

Hydrogen tank undercover 23, like the rear undercover 19, foreign matter anticollision to the floor under the mounting part of a fuel cell vehicle and also because the eyes of the aerodynamic performance and appearance improvement, the front three, the middle three The attachment holes 23a and 23b provided at the six locations are aligned with the screw holes formed in the front and rear lower frames 5e and 5f of the tank frame 5 and bolted. Further, the bolts are fastened to the lower surfaces of the front and rear frame connecting members 15 and 17 by using the mounting holes 23 c at two positions behind the hydrogen tank undercover 23.

  As described above, the rear end portion of the hydrogen tank under cover 23 is overlapped with the front end portion of the rear under cover 19 from below, and a bolt to be inserted from the mounting hole 23d is fastened to the screw hole 19c, thereby fastening the rear under portion. Secure to the cover 19.

  Further, another cover (not shown) is connected to the front end portion of the hydrogen tank under cover 23 to close the front opening of the tank frame 5.

  As shown in FIGS. 1 to 3 in a state where the rear under cover 19 and the hydrogen tank under cover 23 are not mounted, a region 24 behind the hydrogen tank 1 is a peripheral part attached to the hydrogen tank 1. A functional component 25 such as a hydrogen valve is disposed in a state of being attached to the rear frame 5b of the tank frame 5. The functional component 25 is positioned above the front and rear frame connecting members 15 and 17 in the vehicle vertical direction.

  In addition, an exhaust pipe 27 that dilutes hydrogen discharged from a fuel cell (not shown) that serves as a vehicle drive source and flows to the rear of the vehicle is disposed on the left side of one side in the vehicle width direction, extending in the vehicle front-rear direction, A silencer 29 is installed in the middle of the exhaust pipe 27 to mute the exhaust airflow sound. The exhaust pipe 27 behind the silencer 29 is bent upward at the bent portion 27 a and extends rearward along the lower surface of the vehicle body, and exhausts exhaust from the exhaust port 27 b at the rear end via the rear silencer 31.

  The exhaust pipe 27 and the silencer 29 as a whole are positioned above the front and rear frame connecting members 15 and 17 in the vertical direction of the vehicle, as with the functional component 25 described above. A suspension 33 is installed above the silencer 25.

  According to the vehicle body rear structure in the fuel cell vehicle described above, when the vehicle receives an impact from the rear, the rear frame 13 is generally lower in strength than the tank frame 5 and extends in the vehicle front-rear direction. By forming the notch 13n in the vicinity of the center in the longitudinal direction of the connecting pipes 13c and 13d, the rear side member 7 can be easily buckled and deformed, and the shock absorbing function of the rear side member 7 can be achieved. Secured.

  When the rear frame 13 is buckled and deformed as described above, the strength of the front and rear frame connecting members 15 and 17 is higher than that of the tank frame 5 as compared with the rear frame 13 that is easily buckled and deformed. Thus, it is possible to protect the functional component 25 disposed in the region 24 on the rear side of the vehicle 1 and to prevent the rear frame 13 that moves by buckling and deforming toward the front of the vehicle from interfering with the functional component 25.

  At this time, as shown in FIGS. 2 and 3, the vehicle longitudinal direction position between the rear end in the vehicle longitudinal direction of the front and rear frame connecting members 15 and 17 and the cross member 9 as the first cross member extending in the vehicle width direction is substantially the same. Therefore, the front and rear frame connecting members 15 and 17 can be prevented from hindering buckling deformation behind the cross member 9 of the rear side member 7, and the shock absorbing function of the rear side member 7 can be sufficiently secured. .

  In addition, since the tank frame mounting member 12 that connects the cross members 9 and 11 and the support frames 5g and 5h in the tank frame 5 are set at the same position in the vehicle width direction, the same as the support frames 5g and 5h in the vehicle width direction. When the path of the rear extension frames 5n and 5p extending rearward from the position toward the tank frame mounting member 12 is linear and an impact input is applied by pushing up from below the vehicle body, the frame members constituting the tank frame 5 are folded. Deformation can be suppressed and the plate thickness of the frame member can be minimized, thereby achieving cost reduction and weight reduction.

  In addition, a tank frame is attached to the rear portions of the rear extension frames 5n and 5p extending rearward from the same position in the vehicle width direction as the support frames 5g and 5h when the vehicle receives an impact from the rear. Since it is connected to the member 12, the deformation of the tank frame 5 can be prevented.

  Further, since the connecting pipes 13c and 13d of the rear frame 13 and the front and rear frame connecting members 15 and 17 are set at the same position in the vehicle width direction with respect to the support frames 5g and 5h of the tank frame 5, these members are arranged in the vehicle front and rear direction. The rear frame 13 which is located on the same straight line and suppresses the bending deformation of the tank frame 5 and the front and rear frame connecting members 15 and 17 when the vehicle receives an impact from the rear and which buckles and deforms is a hydrogen tank. It is possible to prevent interference with one periphery.

  In addition, since the front and rear frame connecting members 15 and 17 are arranged below the functional part 25 of the hydrogen tank 1 in the vehicle vertical direction, the front and rear frames are interfered with when the lower surface of the vehicle body interferes with the road surface due to the wheels entering the grooves on the road. The frame connecting members 15 and 17 can interfere with each other first to protect the functional component 25.

  Further, since the front and rear frame connecting members 15 and 17 are arranged below the exhaust pipe 27 in the vehicle vertical direction, when the lower surface of the vehicle body interferes with the road surface in the same manner as described above, the front and rear frame connecting members 15 and 17 interfere first. In addition, it is possible to prevent the silencer 29 of the exhaust pipe 27, in particular, from being pushed up from the road surface and interfere with the links of the suspension 29, and it is possible to prevent the vehicle from becoming unable to run.

  Further, since the rear part of the hydrogen tank under cover 23 attached to the lower surface of the tank frame 5 is attached to the front and rear frame connecting members 15 and 17 having the same strength as the tank frame 5, the hydrogen tank under cover is problematic when traveling on the submerged channel. Breakage and deformation of the cover 23 can be prevented.

It is a side view of the vehicle body rear part structure concerning one Embodiment of this invention. It is the perspective view which looked at the vehicle body rear part structure of FIG. 1 from the vehicle body downward direction. It is a bottom view of FIG. It is a perspective view of the tank frame used for the vehicle body rear part structure of FIG. It is a perspective view of the rear frame used for the vehicle body rear part structure of FIG. It is a perspective view which shows the state which mutually connected the tank frame and the rear frame with the front-and-rear frame connection member. FIG. 4 is an exploded perspective view of a tank frame and a rear frame, and a hydrogen tank under cover and a rear under cover in a state of being connected to each other.

Explanation of symbols

1 Hydrogen tank (fuel container)
5 Tank frame (container frame)
5g, 5h Tank frame support frame (container frame member)
5n, 5p Rear extension frame (container mounting arm)
9 Cross member (first cross member)
11 Cross member (second cross member)
12 Tank frame mounting member (cross member connecting member)
13 Rear frame 13c, 13d Rear frame connecting pipe (rear frame member)
15, 17 Front and rear frame connecting members 23 Hydrogen tank under cover (container under cover)
25 Functional parts of hydrogen tank (peripheral parts attached to fuel container)
27 Exhaust pipe

Claims (8)

A rear frame having a container frame for supporting a hydrogen tank attached to the lower surface of the vehicle, and a pipe member having a strength lower than that of the container frame and extending in the vehicle front-rear direction on the lower surface of the vehicle behind the container frame mounting, and the rear frame and the container frame, connected by front and rear frame connecting member comprising the same intensity and the container frame, the rear of the hydrogen tank is arranged functional components is a peripheral component that is included with the hydrogen tank A vehicle body rear structure characterized by that. The vehicle body rear part structure according to claim 1, wherein a vehicle front-rear direction position of a rear end of the front-rear frame connecting member in the vehicle front-rear direction and a first cross member on the vehicle body side extending in the vehicle width direction are matched. The first cross member and a second cross member extending in the vehicle width direction positioned in front of the vehicle are connected by a cross member connecting member, and the cross member connecting member and a lower portion of the hydrogen tank in the container frame are supported. The container frame member extending in the vehicle longitudinal direction is set at the same position in the vehicle width direction, and the container in the container frame extends from the same position in the vehicle width direction as the container frame member to the cross member connecting member. The vehicle body rear part structure according to claim 1 or 2, wherein the rear part of the mounting arm in the vehicle front-rear direction is connected.   The rear frame member extending in the vehicle body front-rear direction of the rear frame and the front-rear frame connecting member are set at the same position in the vehicle width direction with respect to the container frame member extending in the vehicle front-rear direction of the container frame. Item 4. The vehicle body rear structure according to Item 3. The vehicle body rear part structure according to any one of claims 1 to 4, wherein the front and rear frame connecting members are arranged below a peripheral part attached to the hydrogen tank in a vehicle vertical direction.   The vehicle body rear part structure according to any one of claims 1 to 5, wherein the front and rear frame connecting members are arranged below a vehicle vertical direction from an exhaust pipe through which exhaust exhausted from a drive source of the vehicle flows. .   The vehicle body according to any one of claims 1 to 6, wherein a container under cover is attached to a lower surface of the container frame, and a rear part of the container under cover in the vehicle front-rear direction is attached to the front / rear frame connecting member. Rear structure. A rear frame having a container frame for supporting a hydrogen tank attached to the lower surface of the vehicle, and a pipe member having a strength lower than that of the container frame and extending in the vehicle front-rear direction on the lower surface of the vehicle behind the container frame mounting, and the rear frame and the container frame, connected by front and rear frame connecting member comprising the same intensity and the container frame, the rear of the hydrogen tank is disposed a functional part is a peripheral part that comes into the hydrogen tank The vehicle body rear structure is characterized in that the rear frame buckles and deforms so that a vehicle body skeleton member extending in the vehicle longitudinal direction can buckle and deform when the vehicle receives an impact from the rear.

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