JP2010184574A - Rear part vehicle body structure of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve mountability and shock resistance when mounting battery and hydrogen tank in a rear part of a vehicle body. <P>SOLUTION: A pipe member is curved into a U-shape so that right and left straight line parts 16b may be extended from both ends of a curved part 16a, which is curved into a projection toward a rear side of the vehicle body, toward the front of the vehicle body, to form a U-shaped frame 16, and front ends and rear ends of the right and left straight line parts 16b of the U-shaped frame 16 are connected by first and second cross members 17 and 18, respectively, to constitute a rear sub frame 15, thereby, load of rear end collision is received by the curved part 16a of the U-shaped frame 16 having high rigidity because the frame 16 is curved. Thus, the battery 26 supported in a front part frame body 20 sectioned by the right and left straight line parts 16b and the first and second cross members 17 and 18, and the hydrogen tank 27 supported in a rear part frame body 21 sectioned by the curved part 16a and the second cross member 18 can be effectively protected. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rear vehicle body structure in which a battery and a hydrogen tank are mounted on a subframe that is detachably fixed to a rear vehicle body of the vehicle.

  The rear body frame of the automobile is formed in a U-shape as a whole by connecting a semicircular second rear frame to the rear ends of the pair of left and right first rear frames extending in the longitudinal direction of the vehicle body. Patent Document 1 below discloses a structure in which a middle cross member and a rear cross member that extend in the vehicle width direction are connected between the front end and the rear end of the rear frame.

Japanese Patent Laid-Open No. 2007-137326

  By the way, in a fuel cell vehicle, it is necessary to mount a hydrogen tank for storing hydrogen as fuel and a battery for storing electric power generated using hydrogen as fuel. If these batteries and hydrogen tank are individually mounted on the vehicle body, the workability is not good. Therefore, it is conceivable that the battery and the hydrogen tank are fixed to the subframe in advance, and the subframe is mounted on the vehicle body collectively. In this case, it is necessary to consider the structure of the subframe so that the battery and the hydrogen tank are not damaged even if a rear impact is applied to the vehicle body.

  The present invention has been made in view of the above circumstances, and an object thereof is to improve the mountability and the impact resistance when a battery and a hydrogen tank are mounted at the rear of the vehicle body.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided a rear vehicle body structure in which a battery and a hydrogen tank are mounted on a rear subframe that is detachably fixed to a rear vehicle body of the vehicle. The rear sub-frame is formed by bending a pipe member in a U shape so that left and right straight portions extend from both ends of a curved portion that curves convexly toward the rear of the vehicle body toward the front of the vehicle body. A first cross member that connects the front ends of the left and right straight portions in the vehicle width direction, and a second cross member that connects the rear ends of the left and right straight portions in the vehicle width direction, The battery supports the battery inside the front frame defined by the left and right straight portions, the first cross member and the second cross member, and the rear portion defined by the curved portion and the second cross member. Rear vehicle body structure for an automobile, characterized in that for supporting the hydrogen tank within the body is proposed.

  According to a second aspect of the present invention, in addition to the structure of the first aspect, the second cross member is shared by the battery and the hydrogen tank. A body structure is proposed.

  According to a third aspect of the present invention, in addition to the structure of the first or second aspect, a rear vehicle body structure is proposed in which the front end of the rear subframe is connected to the rear side frame. Is done.

  According to the configuration of the first aspect, the pipe member is curved in a U shape so that the left and right straight portions extend from both ends of the curved portion that curves convexly toward the rear of the vehicle body toward the front of the vehicle body. Since the rear sub-frame is formed by connecting the front and rear ends of the left and right straight portions of the U-shaped frame with the first and second cross members, respectively, it is rigid because it is curved. A battery that receives a rear collision load at the curved portion of the U-shaped frame and that is supported by the left and right straight portions and the front frame defined by the first and second cross members, and the curved portion and the second portion. It is possible to effectively protect the hydrogen tank supported inside the rear frame section defined by the cross member. In addition, by supporting the battery and the hydrogen tank in the rear subframe in advance, it is possible to mount the battery and the hydrogen tank together with the rear subframe on the vehicle body. Since the hydrogen tank is surrounded by the U-shaped frame and the first and second cross members, damage caused by a collision load can be avoided more reliably.

  According to the second aspect of the present invention, since the second cross member is shared by the battery support and the hydrogen tank support, the number of parts and the increase in the longitudinal dimension of the rear sub-frame in the vehicle body can be avoided, and the battery and A hydrogen tank can be supported.

  According to the third aspect of the present invention, since the front end of the rear subframe is connected to the rear side frame, the collision load input to the rear end of the rear subframe due to a rear collision is transmitted to the rear side frame that is a strength member. Can be absorbed.

Perspective view of the rear of the car body 2 direction view of FIG. 3 direction enlarged arrow view of FIG. 4-4 enlarged cross-sectional view of FIG. FIG. 5 is an enlarged sectional view taken along line 5-5.

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

  As shown in FIG. 1 and FIG. 2, a pair of left and right rear side frames 11, 11 are arranged in the vehicle body longitudinal direction at the rear part of the fuel cell vehicle, and their front ends are located on the left and right sides of the vehicle compartment in the vehicle longitudinal direction. Are connected to the rear ends of a pair of left and right side sills 12, 12 extending in the direction of The front ends of the left and right rear side frames 11, 11 are connected by a middle cross member 13 extending in the vehicle width direction, and the rear ends are connected by a rear cross member 14 extending in the vehicle width direction.

  The rear sub-frame 15 that is detachably fixed to the rear portion of the vehicle body includes a U-shaped frame 16 in which a pipe member having a circular cross section or an elliptic cross section is curved in a U shape. The U-shaped frame 16 includes a semicircular curved portion 16a that curves convexly toward the rear of the vehicle body, and a pair of left and right linear portions 16b and 16b that extend linearly from both ends of the curved portion 16a toward the front of the vehicle body. Prepare for one.

  The left and right front ends of the straight portions 16b and 16b of the U-shaped frame 16 are connected by a first cross member 17 extending in the vehicle width direction, and between the left and right rear ends of the straight portions 16b and 16b of the U-shaped frame 16, that is, a curved portion. The left and right front ends of 16a are connected by a second cross member 18 extending in the vehicle width direction, and the rear portion of the curved portion 16a of the U-shaped frame 16 is connected by a third cross member 19 extending in the vehicle width direction. The first to third cross members 17 to 19 are formed of a pipe member having a rectangular cross section, and a portion of which the lower surface is cut out in a semicircular shape is fitted into the U-shaped frame 16 from above and fixed by welding (see FIG. 4).

  As a result, the rear sub-frame 15 has a rectangular front frame positioned on the front side of the vehicle body and defined by the left and right straight portions 16b and 16b of the U-shaped frame 16 and the first and second cross members 17 and 18. A body 20 and a semicircular rear frame 21 located on the rear side of the vehicle body and defined by the curved portion 16a of the U-shaped frame 16 and the second cross member 18 are formed.

  The first cross member 17 protrudes from the left and right straight portions 16b, 16b of the U-shaped frame 16 to the outside in the vehicle width direction, and the protruding portions are formed by two bolts 22, 22 on the left and right rear side frames 11 respectively. , 11 is detachably fixed to the upper surface of the substrate 11 (see FIGS. 1 and 4). Further, the rear end of the curved portion 16a that contacts the front surface of the rear cross member 14 is fitted into a concave portion of a mounting member 23 formed by bending a metal plate, and the mounting member 23 is attached to the upper surface and the front surface of the rear cross member 14 with bolts 24, 24; fixed by fastening at 25, 25 (see FIG. 5).

  The rectangular parallelepiped battery 26 is suspended and supported on the lower surface of the rectangular front frame 20 of the rear subframe 15. That is, mounting bands 28, 28 formed in a rectangular shape with metal strips are wound around the left and right sides of the battery 26, and the fixing portions 28 a, 28 b before and after each mounting band 28 are the lower surfaces of the first cross member 17. The bracket 17a (see FIGS. 2 and 4) and the bracket 18a (see FIG. 2) on the lower surface of the second cross member 18 are fastened by bolts 29 and 30, respectively.

  The hydrogen tank 27 has a shape in which hemispherical portions 27b and 27b are coupled to both ends of the central cylindrical portion 27a so as to withstand high pressure, and is formed on the lower surface of the semicircular rear frame 21 of the rear subframe 15. Supported by hanging. That is, mounting bands 31, 31 formed in a circular shape with metal band plates are wound around the left and right sides of the hydrogen tank 27, and the fixing portions 31 a, 31 b before and after each mounting band 31 are the lower surfaces of the second cross member 18. The bracket 18b (see FIGS. 2 and 3) and the bracket 19a (see FIG. 2) on the lower surface of the third cross member 19 are fastened by bolts 32 and 33, respectively.

  As described above, by supporting the battery 26 and the hydrogen tank 27 on the rear subframe 15 in advance, the battery 26 and the hydrogen tank 27 together with the rear subframe 15 can be mounted together on the vehicle body. In addition to improving the mountability, the battery 26 and the hydrogen tank 27 can be mounted without significantly modifying the frame of an existing electric vehicle or gasoline vehicle.

  Further, a U-shaped frame 16 having a curved portion 16a and a pair of straight portions 16b, 16b is configured by bending a pipe member into a U shape, and the U-shaped frame 16 extends in the vehicle width direction. Since the rear subframe 15 is connected by the cross members 17 to 19, the rear subframe 15 can be manufactured at low cost. In addition, since the curved portion 16a of the U-shaped frame 16 having high rigidity receives the load of the rear collision, it is partitioned by the left and right straight portions 16b and 16b and the first and second cross members 17 and 18. The battery 26 supported inside the front frame 20 and the hydrogen tank 27 supported inside the rear frame 21 defined by the curved portion 16a and the second and third cross members 18 and 19 are effectively protected. can do. In particular, since the battery 26 and the hydrogen tank 27 are surrounded by the U-shaped frame 16 and the first to third cross members 17 to 19 over 360 °, damage to the collision load can be avoided more reliably. can do.

  Further, since the second cross member 18 of the rear subframe 15 is commonly used to support the mounting bands 28 and 28 of the battery 26 and the mounting bands 31 and 31 of the hydrogen tank 27, the number of parts can be increased without increasing the number of parts. The battery 26 and the hydrogen tank 27 can be supported without increasing the dimension of the subframe 15 in the longitudinal direction of the vehicle body. Further, the battery 26 having a rectangular shape in plan view is supported by the front frame portion 20 having a rectangular shape in plan view of the rear subframe 15, and the hydrogen tank 27 having a bowl shape in plan view is semicircular in plan view of the rear subframe 15. As a result, the space utilization efficiency in the rear subframe 15 is improved.

  Furthermore, since the front end of the rear sub-frame 15 is connected to the rear side frames 11, 11, the collision load input to the curved portion 16 a of the rear sub-frame 15 due to the rear collision is applied to the left and right straight portions 16 b, 16b is transmitted to the left and right rear side frames 11 and 11 which are strength members, and further transmitted to the left and right side sills 12 and 12 which are strength members from there.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, although the U-shaped frame 16 of the embodiment includes the third cross member 19 at the rear end of the curved portion 16a, the third cross member 19 may be omitted. In this case, the attachment bands 31 and 31 that support the hydrogen tank 27 may be fastened to a bracket fixed to the curved portion 16a.

11 Rear side frame 15 Rear subframe 16 U-shaped frame 16a Curved portion 16b Straight line portion 17 First cross member 18 Second cross member 20 Front frame body 21 Rear frame body 26 Battery 27 Hydrogen tank

Claims (3)

A vehicle rear body structure in which a battery (26) and a hydrogen tank (27) are mounted on a rear subframe (15) removably fixed to a rear vehicle body of the vehicle,
The rear sub-frame (15) has a U-shaped pipe member with left and right straight portions (16b) extending from both ends of a curved portion (16a) that curves convexly toward the rear of the vehicle body toward the front of the vehicle body. A U-shaped frame (16) configured to be curved, a first cross member (17) connecting the front ends of the left and right straight portions (16b) in the vehicle width direction, and the left and right straight portions (16b) A second cross member (18) connecting the rear ends of the two in the vehicle width direction,
While supporting the battery (26) inside the front frame (20) defined by the left and right straight portions (16b), the first cross member (17) and the second cross member (18), A rear vehicle body structure for an automobile, wherein the hydrogen tank (27) is supported inside a rear frame (21) defined by the curved portion (16a) and the second cross member (18).   The rear body structure of an automobile according to claim 1, wherein the second cross member (18) is shared by the battery (26) and the hydrogen tank (27).   The rear body structure of an automobile according to claim 1 or 2, wherein a front end of the rear subframe (15) is connected to a rear side frame (11).

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