JP2014210464A - Vehicle body structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve protection performance of protecting a fuel tank at the time of a rear-end collision.SOLUTION: A vehicle body 11 includes: a rear floor cross member 24 positioned in a rear part and a lower part of the vehicle body and extending in a vehicle width direction; forward reinforcing members 36, 36 which extend to a front side of the vehicle body from the rear cross member and are joined to the lower part of the vehicle body at front end parts 36b, 36b; and tank fixing members 35, 35 which are joined to the forward reinforcing members at one end parts 35a. The tank fixing members fix a fuel tank 34 arranged in front of the rear floor cross member and on the lower part of the vehicle body to the lower part of the vehicle body by supporting from beneath.

Description

  The present invention relates to an improved technique of a portion where a fuel tank is arranged and a portion around the portion in a vehicle body of a vehicle such as a passenger car.

  A technique in which an accessory is provided at the lower part of the rear part of the vehicle body is known from Patent Document 1, for example. The accessory attached to the lower part of the rear part of the vehicle body known from Patent Document 1 is a rear suspension.

  The rear portion of the vehicle body includes left and right rear side members extending in the longitudinal direction of the vehicle body, and a cross member spanned between rear ends of the left and right rear side members. A suspension member support member is attached to the lower part of the rear portion of the vehicle body. The suspension member support member is provided with a rear suspension. The left and right reinforcing members extend obliquely from the lower end of the rear portion of the suspension member support member forward and outward in the vehicle width direction. The front end portions of the left and right reinforcing members are attached to both sides of the vehicle body. According to Patent Document 1, the attachment rigidity of the suspension member support member to the vehicle body is increased.

  Another accessory attached to the lower part of the rear part of the vehicle body is a fuel tank. Since the fuel tank is a part of the fuel supply system, it is an important accessory as much as the rear suspension. For this reason, it is required that the fuel tank can be sufficiently protected during a so-called rear collision in which a collision load acts on the vehicle from the rear.

Japanese Patent No. 5028958

  This invention makes it a subject to provide the technique which can improve the protection performance which protects a fuel tank at the time of a rear collision.

  According to the first aspect of the present invention, the rear floor cross member that is positioned at the rear lower portion of the vehicle body and extends in the vehicle width direction and supports the floor panel, extends from the rear floor cross member toward the front of the vehicle body, and the front end portion is A forward reinforcing member joined to the lower part of the vehicle body, and a tank fixing member for supporting a fuel tank arranged in front of the rear floor cross member and in the lower part of the vehicle body from below and fixed to the lower part of the vehicle body In addition, a vehicle body structure is provided in which one end of the tank fixing member is attached to the forward reinforcing member.

  According to a second aspect of the present invention, the vehicle is preferably located on both sides in the vehicle width direction of the rear portion of the vehicle body and extends left and right rear side frames extending in the vehicle body longitudinal direction, forward from the rear floor cross member and outward in the vehicle width direction. It further includes left and right diagonal reinforcing members extending diagonally toward the front and having front ends joined to the left and right rear side frames.

  Preferably, the front reinforcing member further includes a front cross member positioned in front of the forward reinforcing member and extending in the vehicle width direction and joined to the lower portion of the vehicle body. The part is joined to the front cross member.

  As described in claim 4, preferably, the upper portion of the front cross member has a seat fixing portion for fixing a seat disposed in the passenger compartment.

  According to a fifth aspect of the present invention, preferably, a canister fixing portion for attaching a canister for temporarily storing fuel evaporative gas is provided at a lower portion of the vehicle body and in front of the rear floor cross member.

  In the invention according to claim 1, the rear floor cross member is supported by the forward reinforcing member so as to restrict the leaning toward the front side of the vehicle body. One end of a tank fixing member is attached to the forward reinforcing member. The tank fixing member is a member for supporting the fuel tank from below and fixing it to the lower part of the vehicle body. During a so-called rear collision in which a collision load is applied to the vehicle from the rear, the collision load is transmitted from the rear floor cross member to the forward reinforcing member. When the rear floor cross member and the forward reinforcing member are plastically deformed forward by the collision load, the collision load acts on the one end portion of the tank fixing member from the forward reinforcement member. When the tank fixing member is plastically deformed forward, the fuel tank supported by the tank fixing member is also displaced forward. Therefore, it is possible to prevent the rear floor cross member plastically deformed forward from hitting the fuel tank. As a result, it is possible to improve the protection performance for protecting the fuel tank at the time of a rear collision.

  In the invention according to claim 2, the left and right diagonal reinforcing members extend from the rear floor cross member forward and obliquely outward in the vehicle width direction, and the front ends are joined to the left and right rear side frames. For this reason, the rear floor cross member which received the collision load at the time of rear collision can be supported more firmly by the left and right diagonal reinforcing members. Therefore, it is possible to further restrict the rear floor cross member from falling to the front side of the vehicle body. Furthermore, the rigidity of the vehicle body can be further increased by the left and right diagonal reinforcing members.

  In the invention which concerns on Claim 3, the front-end part of a front facing reinforcement member is joined with respect to the front side cross member extended in the vehicle width direction. For this reason, the rear floor cross member is joined to the front cross member via the forward reinforcing member. The rear floor cross member that has received a collision load at the time of a rear collision can be supported more firmly by the front cross member via the forward reinforcing member. Therefore, it is possible to further restrict the rear floor cross member from falling to the front side of the vehicle body. Furthermore, the rigidity of the vehicle body can be further increased by the front cross member.

  In the invention which concerns on Claim 4, the upper part of the front side cross member has a sheet | seat fixing | fixed part for fixing a sheet | seat. Since the front cross member is joined to the rear floor cross member via the forward reinforcing member, the front cross member has high rigidity. Such a high-rigidity front cross member can sufficiently support the load acting from the seat via the seat fixing portion. In addition, the front cross member can firmly maintain the fixed state of the seat via the seat fixing portion even when it receives a collision load at the time of rear collision.

  In the invention which concerns on Claim 5, the canister fixing | fixed part for attaching a canister is provided in the lower part of the vehicle body and before the rear floor cross member. The canister temporarily stores the fuel evaporative gas generated from the fuel tank, and constitutes a part of the fuel supply system. By installing a canister at the lower part of the vehicle body and in front of the rear floor cross member, the canister can be protected from a collision load at the time of rear collision.

It is the perspective view which looked at the lower part of the rear half part of the vehicle body concerning the present invention from the lower part. FIG. 2 is a bottom view of the lower part of the rear half of the vehicle body shown in FIG. 1. FIG. 2 is a left side view of the lower part of the rear half of the vehicle body shown in FIG. 1. It is the perspective view which looked at the 1st-3rd cross member shown by FIG. 1 from the top. FIG. 5 is a cross-sectional view taken along line 5-5 of FIG. FIG. 3 is a bottom view showing a positional relationship between a fuel tank and a canister with respect to the vehicle body shown in FIG. 2. FIG. 2 is a perspective view showing a positional relationship between a fuel tank and a canister with respect to the vehicle body shown in FIG. 1. FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 4.

  EMBODIMENT OF THE INVENTION The form for implementing this invention is demonstrated below based on an accompanying drawing.

  A vehicle body rear structure according to an embodiment will be described with reference to the drawings. "Front", "Rear", "Left", "Right", "Up", "Down" follow the direction seen from the driver, Fr is front, Rr is rear, Le is left, Ri is right , CL indicates the vehicle width center line.

  As shown in FIGS. 1 and 2, a vehicle body 11 of a vehicle 10 such as a passenger car is formed of a monocoque body, and substantially extends with respect to a vehicle width center line CL that extends in the vehicle longitudinal direction through the center of the vehicle 10 in the vehicle width direction. Therefore, it is formed symmetrically. The vehicle 10 includes, for example, three rows of seats (a front seat, a center seat, and a rear seat) in the front and rear of a vehicle compartment 12.

  The vehicle body 11 includes left and right side sills 21 and 21, left and right rear side frames 22 and 22, a floor panel 23, and four cross members 24 to 27 at a lower portion of the rear half portion.

  The left and right side sills 21 and 21 are located in the front-rear direction center of the vehicle body 11 and on both sides in the vehicle width direction, and extend in the vehicle body front-rear direction.

  The left and right rear side frames 22, 22 extend rearward and upward from the rear ends of the left and right side sills 21, 21, and further extend substantially horizontally rearward. That is, the left and right rear side frames 22 and 22 are positioned on both sides in the vehicle width direction of the rear portion of the vehicle body 11 and extend in the vehicle body longitudinal direction.

  The floor panel 23 is continuously stretched between the left and right side sills 21 and 21 and between the left and right rear side frames 22 and 22 and is supported by four cross members 24 to 27 to form the lower surface of the vehicle compartment 12. . The rear end 23a of the floor panel 23 extends upward by a predetermined height to ensure rigidity. For this reason, it is optional to provide a cross member at the rear end 23a of the floor panel 23.

  The four cross members 24 to 27 are arranged in the order of the first cross member 24, the second cross member 25, the third cross member 26, and the fourth cross member 27 from the rear of the vehicle body to the front. Each of the cross members 24 to 27 is formed in a substantially rectangular closed cross section when viewed from the outside in the vehicle width direction, and between both ends of the vehicle body 11 in the vehicle width direction, that is, between the left and right rear side frames 22 and 22. It is stretched and joined.

  More specifically, as shown in FIGS. 1 to 4, the first cross member 24 is spanned and joined between the left and right rear side frames 22, 22 in the vehicle body longitudinal center. For example, the first cross member 24 is located behind the left and right damper receiving portions 31, 31 provided on the left and right rear side frames 22, 22. The left and right damper receiving portions 31, 31 are members for receiving upper end portions of dampers of left and right rear suspensions (not shown).

  A floor panel 23 is stretched on the upper end of the first cross member 24. Since the first cross member 24 is located at the rear lower part of the vehicle body 11 and extends in the vehicle width direction and supports the floor panel 23, it is also referred to as “rear floor cross member 24” or “floor cross member 24”. The height of the first cross member 24 from the left and right rear side frames 22, 22 is large among the four cross members 24 to 27. A substantially U-shaped suspension support portion 32 extending in the vehicle width direction along the lower surface is integrally formed on the lower surface of the first cross member 24.

  As shown in FIGS. 2, 4, and 5, the second cross member 25 is positioned between the left and right damper receiving portions 31, 31 and is spanned and joined between the left and right rear side frames 22, 22. ing. The height of the lower surface of the second cross member 25 is substantially coincident with or higher than the upper surface of the first cross member 24. The second cross member 25 has a structure of an upper and lower divided body, and the floor panel 23 is integrally interposed between the upper and lower sides, so that two closed cross sections are formed on the upper and lower sides.

  Referring also to FIG. 1, the third cross member 26 is located between the rear ends of the left and right side sills 21, 21 and the left and right damper receiving portions 31, 31 and is hung between the left and right rear side frames 22, 22. Passed and joined. The third cross member 26 has a substantially open hat-like cross section when viewed from the outside in the vehicle width direction, and a floor panel 23 is stretched on the upper end. As a result, a closed cross section is formed by the floor panel 23 and the third cross member 26.

  As shown in FIGS. 1 and 2, the fourth cross member 27 is spanned and joined between the front ends of the left and right rear side frames 22, 22. The fourth cross member 27 has a substantially open hat-like cross section when viewed from the outside in the vehicle width direction, and a floor panel 23 is stretched at the upper end. As a result, a closed cross section is formed by the floor panel 23 and the fourth cross member 27.

  A space 33 surrounded by the left and right rear side frames 22, 22, the third cross member 26, the fourth cross member 27, and the floor panel 23 constitutes a tank storage portion for storing the fuel tank 34 (see FIG. 6). doing. A lower portion of the space 33 (hereinafter referred to as “tank storage portion 33”) is open.

  Referring also to FIG. 6, the fuel tank 34 is disposed in front of the first cross member 24 and in the lower portion of the vehicle body 11, that is, in the tank storage portion 33, and is attached to the vehicle body 11 by the left and right tank fixing members 35 and 35. It is suspended. More specifically, the left and right tank fixing members 35, 35 support the fuel tank 34 disposed in front of the first cross member 24 and at the lower part of the vehicle body 11 from below to fix it to the lower part of the vehicle body 11. It is a member. The left and right tank fixing members 35, 35 are constituted by, for example, a substantially strip-shaped steel plate band elongated in the front-rear direction.

  As shown in FIGS. 1 and 2, left and right forward reinforcing members 36 and 36 and left and right diagonal reinforcing members 37 and 37 extend from the first cross member 24 (rear floor cross member 24) to the front of the vehicle body.

  Referring also to FIG. 5, the left and right forward reinforcing members 36, 36 extend from the first cross member 24 toward the front of the vehicle body, and the front end portions 36 b, 36 b are joined to the lower portion of the vehicle body 11, that is, the third cross member 26. ing. Since the third cross member 26 is positioned in front of the forward reinforcing members 36 and 36 and extends in the vehicle width direction, it is also referred to as a “front cross member 26”. The overall shape of the left and right forward reinforcing members 36, 36 is tapered from the rear end toward the front end, and is formed into a substantially open hat-shaped cross section when viewed from the rear of the vehicle body.

  The rear end portions 36a, 36a of the left and right forward reinforcing members 36, 36 are joined over the entire height of the first cross member 24, extend forward along the lower surface of the floor panel 23, and the lower surface of the floor panel 23. And the second cross member 25. The front end portions 36 b and 36 b of the left and right forward reinforcing members 36 and 36 are overlapped and joined to the lower surface of the floor panel 23 together with the flange of the third cross member 26.

  As shown in FIGS. 6 and 7, the left and right tank fixing members 35, 35 are bolted to the lower surfaces of the left and right forward reinforcing members 36, 36 with the respective one end portions 35 a, 35 a (rear end portions 35 a, 35 a). The other end portions 35b and 35b (front end portions 35b and 35b) are attached to the lower surface of the fourth cross member 27 by bolting.

  As shown in FIGS. 1 and 2, a space 38 surrounded by the floor panel 23, the first cross member 24, the third cross member 26, and the left and right forward reinforcing members 36, 36 is a canister 39 (see FIG. 6). The canister storage part for storing the is comprised. A lower portion of the space 38 (hereinafter referred to as “canister storage portion 38”) is open. The second cross member 25 passes over the canister housing portion 38 and serves as a canister fixing portion for attaching the canister 39 housed in the canister housing portion 38 by bolting or the like. Hereinafter, the second cross member 25 is referred to as “canister fixing portion 25” as appropriate. As described above, the canister fixing portion 25 (second cross member 25) for attaching the canister 39 is provided in the lower part of the vehicle body 11 and in front of the first cross member 24.

  As shown in FIGS. 6 and 7, the canister 39 temporarily stores the fuel evaporative gas generated from the fuel tank 34 and constitutes a part of the fuel supply system. It is a kind. By attaching the canister 39 to the lower part of the vehicle body 11 and in front of the first cross member 24, the canister 39 can be protected from a collision load at the time of a rear collision.

  As shown in FIGS. 1 to 3, the left and right diagonal reinforcing members 37, 37 extend obliquely from the first cross member 24 forward and outward in the vehicle width direction, with the front end portion being the left and right rear side frames. 22 and 22 are joined. More specifically, the left and right diagonal reinforcing members 37, 37 are constituted by pipes. The rear end portions of the left and right diagonal reinforcing members 37, 37 are positioned slightly closer to the center of the vehicle width than the rear end portions of the left and right forward reinforcing members 36, 36. It is attached by a stop. The front end portions of the left and right diagonal reinforcing members 37, 37 are positioned between the second cross member 25 and the third cross member 26, and are attached to the lower end portions of the left and right rear side frames 22, 22 by bolting. .

  As shown in FIGS. 4 and 8, the third cross member 26 has a plurality of sheet fixing portions 41 at the top. The plurality of seat fixing portions 41 are members for fixing the left and right seats 42 (only the right seat 42 is shown in the figure) disposed in the passenger compartment 12. The left and right sheets 42 correspond to the center sheet, for example. More specifically, the plurality of sheet fixing portions 41 are constituted by substantially flat plate-like thick plates that are interposed and joined between the lower surface of the floor panel 23 and the upper surface of the third cross member 26.

  The right seat 42 has left and right leg portions 42a, 42a at the rear. The left and right leg portions 42 a and 42 a are placed on the two seat fixing portions 41 and 41 from the top of the floor panel 23, and are respectively attached by bolts 43.

  As described above, since the third cross member 26 is joined to the first cross member 24 via the left and right forward reinforcing members 36 and 36 (see FIG. 2), the third cross member 26 has high rigidity. Such a highly rigid third cross member 26 can sufficiently support the load acting from the right seat 42 via the two seat fixing portions 41, 41. Moreover, even when the third cross member 26 receives a collision load at the time of a rear collision, the right seat 42 can be firmly fixed via the seat fixing portions 41 and 41. it can.

  The left sheet (not shown) is also attached to the two sheet fixing portions 41, 41 in the same manner as the right sheet 42.

  As shown in FIGS. 1 and 2, two vehicle body members 51 and 52 are located between the rear end 23 a of the floor panel 23 and the first cross member 24, and constitute a part of the vehicle body 11. ing. The two vehicle body members 51, 52 cross each other vertically and are joined together so that they are combined in a substantially cross shape in plan view, extend along the back surface (lower surface) of the floor panel 23, and are joined to the back surface. Yes. A portion 53 where the two body members 51 and 52 intersect each other is hereinafter referred to as an “intersection 53”.

  One of the two vehicle body members 51 and 52 is a lateral member extending over both ends of the vehicle body 11 in the vehicle width direction (that is, between the left and right rear side frames 22 and 22). Of the two body members 51, 52, the other member 52 is a longitudinal member extending in the longitudinal direction of the vehicle body. Hereinafter, one member 51 is appropriately referred to as “horizontal member 51”, and the other member 52 is referred to as “vertical member 52”.

  The vertical member 52 passes through the vehicle width center line CL, and has a front end joined to the first cross member 24. Further, the vertical member 52 has a substantially open hat-like cross section when viewed from the rear of the vehicle body, and a floor panel 23 is stretched on the upper end. As a result, the floor panel 23 and the vertical member 52 form a closed cross section.

  The front end 52 a of the vertical member 52 is joined to the floor cross member 24. The rear end portion 52b of the vertical member 52 extends upward along the rear end 23a of the floor panel 23 and is joined to the rear end surface. That is, the rear end portion of the vertical member 52 is formed in an approximately L shape in the horizontal direction when viewed from the outside in the vehicle width direction.

  A hook 54 is provided at the rear end 52b of the vertical member 52 for use when the vehicle body 11 is pulled. When the vehicle body 11 is pulled, the load acting on the rear end portion 52b of the vertical member 52 from the hook 54 is large. On the other hand, since the vertical member 52 intersects and is joined to the horizontal member 51, the load can be distributed to the horizontal member 51. As described above, by using the combined structure of the vertical member 52 and the horizontal member 51, the vehicle body 11 can have sufficient strength to receive a large load acting from the hook 54.

  Since the lateral member 51 is located at the approximate center between the rear end 23a of the floor panel 23 and the first cross member 24 and is parallel to the first cross member 24, the lateral member 51 is a kind of cross member. I can say that. The horizontal member 51 passes under and is joined between the left and right rear side frames 22, 22 under the vertical member 52. Further, the lateral member 51 is formed in a substantially open hat-shaped cross section when viewed from the outside in the vehicle width direction, and a floor panel 23 is stretched on the upper end portion. As a result, a closed cross section is formed by the floor panel 23 and the lateral member 51.

The above configuration is summarized as follows.
The rear floor cross member 24 (first cross member 24) is supported by forward-facing reinforcing members 36 and 36 so as to restrict the leaning toward the front side of the vehicle body. One end portions 35 a and 35 a of tank fixing members 35 and 35 are attached to the forward reinforcing members 36 and 36.

  In a so-called rear collision in which a collision load is applied to the vehicle 10 from the rear, the collision load is transmitted from the rear floor cross member 24 to the forward reinforcing members 36 and 36. When the rear floor cross member 24 and the forward reinforcement members 36, 36 are plastically deformed forward by the collision load, the collision load acts on the one end portions 35a, 35a of the tank fixing members 35, 35 from the front reinforcement members 36, 36. . When the tank fixing members 35 and 35 are plastically deformed forward, the fuel tank 34 supported by the tank fixing members 35 and 35 is also displaced forward. Accordingly, the rear floor cross member 24 plastically deformed forward can be prevented from hitting the fuel tank 34. As a result, the protection performance for protecting the fuel tank 34 at the time of a rear collision can be enhanced.

  Further, left and right diagonal reinforcing members 37, 37 extend obliquely from the rear floor cross member 24 forward and outward in the vehicle width direction, and the front ends are joined to the left and right rear side frames 22, 22. For this reason, the rear floor cross member 24 that has received the collision load at the time of the rear collision can be supported more firmly by the left and right diagonal reinforcing members 37, 37. Therefore, it is possible to further restrict the rear floor cross member 24 from falling to the front side of the vehicle body 11. Furthermore, the rigidity of the vehicle body 11 can be further increased by the left and right diagonal reinforcing members 37.

  Further, the front end portions 36b and 36b of the front reinforcing members 36 and 36 are joined to the front cross member 26 (third cross member 26) extending in the vehicle width direction. Therefore, the rear floor cross member 24 is joined to the front cross member 26 via the forward reinforcing members 36 and 36. The rear floor cross member 24 that has received a collision load at the time of a rear collision can be supported more firmly by the front cross member 26 via the front reinforcing members 36 and 36. Therefore, it is possible to further restrict the rear floor cross member 24 from falling to the front side of the vehicle body 11. Furthermore, the rigidity of the vehicle body 11 can be further increased by the front cross member 26.

  The vehicle body rear portion structure of the present invention is suitable for use in the vehicle 10 in which the fuel tank 34 is disposed at the rear portion of the vehicle body 11.

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 11 ... Vehicle body, 12 ... Cab, 22 ... Rear side frame, 23 ... Floor panel, 24 ... Rear floor cross member (first cross member), 25 ... Canister fixing part (second cross member), 26 ... Front side Cross member (third cross member), 34 ... Fuel tank, 35 ... Tank fixing member, 35a ... One end portion of tank fixing member, 36 ... Forward reinforcing member, 36b ... Front end portion of forward reinforcing member, 37 ... Diagonal reinforcing member, 39 ... canister, 41 ... sheet fixing part, 42 ... sheet.

Claims (5)

A rear floor cross member located in the lower rear portion of the vehicle body and extending in the vehicle width direction to support the floor panel;
A forward-facing reinforcement member extending from the rear floor cross member toward the front of the vehicle body and having a front end joined to a lower portion of the vehicle body;
A fuel tank disposed in front of the rear floor cross member and at a lower portion of the vehicle body, and a tank fixing member for supporting the fuel tank from below and fixing the fuel tank to the lower portion of the vehicle body,
One end of the tank fixing member is attached to the forward reinforcing member. Left and right rear side frames that are positioned on both sides in the vehicle width direction of the rear portion of the vehicle body and extend in the vehicle body longitudinal direction;
The left and right diagonal reinforcing members extending forward from the rear floor cross member and diagonally outward in the vehicle width direction and having front end portions joined to the left and right rear side frames are further included. 1. The vehicle body structure according to 1. A front cross member positioned in front of the forward reinforcing member and extending in the vehicle width direction and joined to the lower portion of the vehicle body;
The vehicle body structure according to claim 1 or 2, wherein a front end portion of the forward reinforcing member is joined to the front cross member.   4. The vehicle body structure according to claim 3, wherein an upper portion of the front cross member has a seat fixing portion for fixing a seat disposed in the passenger compartment.   The canister fixing part for attaching the canister which stores fuel evaporative gas temporarily in the lower part of the said vehicle body and before the said rear floor cross member is provided. 1. The vehicle body structure according to item 1.

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