JP2018039315A - Vehicular rear body structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular rear body structure which can improve safety of a crewman at the time of rear-end collision.SOLUTION: A vehicular rear body structure comprises: abutting members 30 which are coupled to each other over a rear side cross member 5 and a rear floor panel 3 so as to project to a vehicle body lower side with respect to the rear side cross member 5, and are abutted onto a front side cross member 4 when receiving action of an impact load from a vehicle body rear side; and an extrusion member which extrudes the vehicle lower side of the abutting member 30 to the vehicle body front side. The abutting member 30 comprises an abutting part 31 which is abutted onto the front cross member 4 when the vehicle body lower side of the abutting member 30 is extruded to the vehicle body front side by the extrusion member and is rotationally moved.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a rear vehicle body structure of a vehicle, and more particularly, to a rear vehicle body structure of a vehicle provided with a cross member provided between left and right rear side frames.

  In a vehicle such as an automobile, a crash can is interposed between a rear bumper rain extending in the vehicle width direction and a rear side frame extending in the vehicle longitudinal direction at the rear of the vehicle body, and an impact load acts from the rear of the vehicle body at the time of a rear collision (rear collision). Sometimes, a crush can is crushed and deformed so as to be folded to absorb energy.

  In addition, there is known a technique that improves the energy absorption performance at the time of a rear collision by using a spare tire pan of a rear side frame and a rear floor panel disposed at the rear part of the vehicle body. For example, in Patent Document 1, a line-shaped recess is formed so that an angle between a ridge line of a metal hollow columnar member that can also be applied to a rear side frame and a ridge line direction is in a range of 20 degrees to 70 degrees. A material that buckles in a bellows shape when an impact load acts in the axial direction of the member to improve energy absorption performance is disclosed.

  Further, for example, in Patent Document 2, a rear floor panel in which a spare tire pan for accommodating a spare tire is formed at the rear part of the vehicle body, and a cross member laid between the left and right rear side frames on the front side of the vehicle body from the spare tire pan. The spare tire pan is deformed and the load is transmitted to the left and right rear side frames via the cross member when an impact load is applied from the rear of the vehicle body at the time of a rear collision, and energy absorption performance is improved. Yes.

JP 2011-056797 A Japanese Patent No. 5205073

  In recent years, in vehicles such as automobiles, it has been demanded to further improve the safety of passengers in a passenger compartment at the time of a rear collision. A rear side frame is disposed at the rear of the vehicle body, and a cross member is provided between the left and right rear side frames. Even in a built-up vehicle, it is required to improve the safety of passengers in the passenger compartment at the time of rear-end collision.

  SUMMARY OF THE INVENTION Accordingly, the present invention provides a vehicle body structure that can improve the safety of a passenger in a vehicle compartment at the time of a rear collision in a vehicle including a cross member installed between left and right rear side frames. And

  In order to solve the above problems, the present invention is configured as follows.

  In the first aspect of the present invention, a pair of left and right rear side frames extending in the longitudinal direction of the vehicle body at a rear portion of the vehicle body, a rear floor panel erected on the pair of left and right rear side frames, and a vehicle on a lower surface side of the rear floor panel. A rear vehicle body structure that includes a front cross member and a rear cross member that extend in the width direction and that are spaced apart in the vehicle body longitudinal direction and are respectively installed between the pair of left and right rear side frames. An abutting member that is coupled across the rear cross member and the rear floor panel so as to protrude further to the lower side of the vehicle body, and is abutted against the front cross member when an impact load is applied from the rear of the vehicle body, and the abutting member The abutting member is disposed on the rear side of the vehicle body when the impact load is applied from the rear side of the vehicle body. A pushing member that pushes the lower side toward the front side of the vehicle body, and the abutting member is pushed and rotated by the pushing member so that the lower side of the abutting member is pushed toward the front side of the vehicle body. It has the butting part abutted on.

  According to a second aspect of the present invention, in the first aspect of the present invention, the rear side frame is a deformation of the rear side frame between portions where the front cross member and the rear cross member are respectively connected. It is characterized by having a deformation promoting part for promoting the above.

  According to a third aspect of the present invention, in the invention according to the second aspect, the abutting member has a length from a portion coupled to the rear floor panel to the abutting portion in the longitudinal direction of the vehicle body. The distance between the front cross member and the rear cross member is less than the distance obtained by subtracting the length of the deformation promoting portion in the longitudinal direction of the vehicle body.

  According to a fourth aspect of the present invention, there is provided a pair of left and right rear side frames extending in the longitudinal direction of the vehicle body at a rear portion of the vehicle body, a rear floor panel constructed on the pair of left and right rear side frames, and a vehicle width direction on a lower surface side of the rear floor panel. And a rear cross member having a front cross member and a rear cross member installed between the pair of left and right rear side frames and extending in the longitudinal direction of the vehicle. An abutting member coupled across the rear cross member and the rear floor panel so as to project downward, and disposed on the vehicle rear side of the abutting member and on the vehicle body lower side of the rear cross member, An extrusion member extending in the vehicle width direction between the pair of left and right rear side frames, The material includes an abutting portion that abuts against the front cross member, and the rear side frame includes a deformation promoting portion between portions to which the front cross member and the rear cross member are connected, respectively. The length of the member from the portion coupled to the rear floor panel to the butting portion is such that the deformation promoting portion in the vehicle front-rear direction is determined from the distance between the front cross member and the rear cross member in the vehicle front-rear direction. It is provided so that it may be below the distance which pulled the length of.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects of the present invention, the abutting member is configured such that the lower side of the abutting member of the abutting member is the front of the vehicle body by the pushing member. A first abutting portion and a second abutting portion that are abutted against the front cross member when being pushed and rotated, and the first abutting portion is a lower surface portion of the abutting member. The second butting portion is a projecting portion that projects to the front side of the vehicle body provided on the side surface portion of the butting member on the front side of the vehicle body.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the abutting member is a jack bracket with which a jack abuts, and the pushing member. Is an exhaust silencer disposed on the rear side of the vehicle body from the jack bracket.

  According to the first aspect of the present invention, the rear body structure of the vehicle including the front and rear cross members provided between the left and right rear side frames protrudes downward from the rear cross member. And an abutting member coupled across the rear cross member and the rear floor panel, and an extruding member that pushes the lower side of the abutting member toward the front side of the vehicle body when an impact load is applied from the rear of the vehicle body. Is provided with an abutting portion that is abutted against the front cross member when the lower side of the abutting member is pushed forward by the pushing member toward the front side of the vehicle body.

  Thus, when an impact load from the rear of the vehicle body is applied, the abutting member that is coupled across the rear cross member and the rear floor panel and abutted against the front cross member can be stretched in the vehicle longitudinal direction. The rear part can be prevented from being crushed and the rear part of the vehicle body can be prevented from entering the passenger compartment, and the safety of passengers in the passenger compartment can be improved during a rear-end collision.

  According to the invention described in claim 2, the rear side frame is provided with the deformation promoting portion for promoting the deformation of the rear side frame between the portions to which the front and rear cross members are connected, respectively. Even when there is a gap between the abutting member and the front cross member when the abutting member is pushed out by the pushing member, the deformation promoting portion is crushed and deformed in the axial direction to push the abutting portion against the front cross member. The effect can be obtained effectively.

  According to the invention described in claim 3, the length of the abutting member from the portion coupled to the rear floor panel to the abutting portion is between the front cross member and the rear cross member in the vehicle longitudinal direction. By providing the distance to be equal to or less than the distance obtained by subtracting the length of the deformation promoting portion in the longitudinal direction of the vehicle body, the above effect can be specifically realized.

  According to the fourth aspect of the present invention, the rear vehicle body structure including the front and rear cross members provided between the left and right rear side frames protrudes downward from the rear cross member. The abutting member coupled across the rear cross member and the rear floor panel, and a pushing member disposed on the vehicle rear side of the abutting member and on the vehicle body lower side of the rear cross member. An abutting portion that abuts against the front cross member is provided.

  As a result, when an impact load from the rear of the vehicle body is applied, the abutting member coupled across the rear cross member and the rear floor panel can be abutted against the front cross member and stretched in the longitudinal direction of the vehicle body. It is possible to suppress the deformation of the vehicle and prevent the rear part of the vehicle body from entering the vehicle interior, and to improve the safety of passengers in the vehicle interior during a rear-end collision.

  Further, the rear side frame is provided with a deformation promoting portion between the portions where the front and rear cross members are respectively connected, and the abutting member has a length from the portion coupled to the rear floor panel to the abutting portion. The distance between the front cross member and the rear cross member is less than the distance obtained by subtracting the length of the deformation promoting portion in the longitudinal direction of the vehicle body. The promoting portion can be deformed to abut the abutting portion against the front cross member, and the above effect can be obtained effectively.

  According to the invention described in claim 5, the abutting member includes the first abutting portion and the second abutting portion that are abutted against the front cross member when being pushed forward and rotated. The first abutting portion is a lower surface portion of the abutting member, and the second abutting portion is a protruding portion that projects to the vehicle body front side provided on the side surface portion of the abutting member on the vehicle body front side.

  Thus, even when the abutting member is not rotated until the lower surface portion of the abutting member as the first abutting portion is abutted against the front cross member when an impact load is applied from the rear of the vehicle body, the second abutting is performed. The projecting portion provided on the side surface portion of the abutting member as the portion on the front side of the vehicle body can be abutted against the front cross member, and the deformation of the rear portion of the vehicle body is suppressed to prevent the rear portion of the vehicle body from entering the vehicle interior. be able to.

  According to the invention described in claim 6, the abutting member is a jack bracket, and the pushing member is an exhaust silencer, so that a jack bracket mounted on a vehicle and a separate dedicated member can be provided. An exhaust silencer can be used to improve the safety of passengers in the passenger compartment.

1 is a bottom view of a vehicle body to which a rear vehicle body structure according to a first embodiment of the present invention is applied. 1 is a side view of a vehicle body to which a rear vehicle body structure according to a first embodiment of the present invention is applied. It is sectional drawing of the vehicle body along the Y3-Y3 line in FIG. It is a perspective view which shows the principal part of the vehicle body shown in FIG. It is sectional drawing of the vehicle body along the Y5-Y5 line in FIG. It is a perspective view of a jack bracket. It is the front view, side view, and bottom view of a jack bracket. It is explanatory drawing for demonstrating the deformation | transformation of the vehicle body rear part at the time of a rear collision. It is a bottom view of the vehicle body to which the rear body structure of the vehicle according to the second embodiment of the present invention is applied. It is a perspective view of the jack bracket of the vehicle body to which the rear vehicle body structure according to the third embodiment of the present invention is applied. It is explanatory drawing for demonstrating another deformation | transformation of the vehicle body rear part at the time of a rear collision.

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

  FIG. 1 is a bottom view of a vehicle body to which the vehicle rear body structure according to the first embodiment of the present invention is applied. FIG. 2 is a side view of the vehicle body to which the vehicle rear body structure according to the first embodiment of the present invention is applied. 3 is a cross-sectional view of the vehicle body taken along line Y3-Y3 in FIG. 1, FIG. 4 is a perspective view showing the main part of the vehicle body shown in FIG. 1, and FIG. 5 is taken along line Y5-Y5 in FIG. It is sectional drawing of the vehicle body along.

  As shown in FIGS. 1 to 5, a vehicle body 1 to which the rear vehicle body structure according to the first embodiment of the present invention is applied includes a pair of left and right rear side frames 2 extending in the vehicle body front-rear direction and a pair of left and right vehicles. A rear floor panel 3 erected on the rear side frame 2, and a front cross member that extends in the vehicle width direction on the lower surface side of the rear floor panel 3 and is spaced apart in the longitudinal direction of the vehicle body and erected between the pair of left and right rear side frames 2. No. 4 No. 4 as cross member 4 and rear cross member 5 and a cross member 5 are disposed.

  No. The four cross members 4 are provided so as to connect the left and right rear side frames 2 to the vehicle body front side. No. 5. The cross member 5 is provided so as to connect the vehicle body front-rear direction center sides of the left and right rear side frames 2 and is disposed on the lower surface side of the spare tire storage portion 3a that is provided in the rear floor panel 3 and that is recessed downward. .

  As shown in FIG. 3, the rear side frame 2 includes a lower surface portion 2a and side surface portions 2b on both sides of the lower surface portion 2a that extend in a direction substantially orthogonal to the lower surface portion 2a. A closed cross section is attached to the lower surface side of the rear floor panel 3 and cooperates with the rear floor panel 3 to extend in the longitudinal direction of the vehicle body. In the rear side frame 2, flange portions 2 c on both sides that extend outside the rear side frame 2 are provided on the side surface portions 2 b on both sides, and the flange portions 2 c on both sides are attached to the rear floor panel 3.

  No. As shown in FIG. 4, the four cross members 4 are respectively formed on the outer side from the lower surface portion 4a, the side surface portions 4b on both sides of the lower surface portion 4a extending in the direction substantially perpendicular to the lower surface portion 4a, and the side surface portions 4b on both sides. The flange portions 4c on both sides are formed to have a substantially hat-shaped cross section, and the flange portions 4c on both sides are attached to the lower surface side of the rear floor panel 3 to form a closed section extending in the vehicle width direction in cooperation with the rear floor panel 3. It is composed.

  No. As shown in FIG. 4, the cross member 5 includes a lower surface portion 5a, side surface portions 5b extending in a direction substantially perpendicular to the lower surface portion 5a on both sides of the lower surface portion 5a, and outward from the side surface portions 5b on both sides. The flange portions 5c on both sides are formed to have a substantially hat-shaped cross section, and the flange portions 5c on both sides are attached to the lower surface side of the rear floor panel 3 to form a closed section extending in the vehicle width direction in cooperation with the rear floor panel 3. It is composed.

  The rear end portions of the left and right rear side frames 2 are respectively attached to crash cans 7 mounted at both ends of a rear bumper rain 6 provided in a rear bumper (not shown) extending in the vehicle width direction at the rear of the vehicle body. The crash can 7 is crushed and deformed so as to be folded when an impact load is applied from the rear of the vehicle body at the time of a rear collision, and absorbs energy.

  A front end portion of the rear side frame 2 is overlapped and connected to a rear end portion of the kick-up frame 10 that is inclined outward in the vehicle width direction and downward of the vehicle body from the vehicle body rear side toward the vehicle body front side. The front end of the front is overlapped and connected to the rear end of the front floor frame 11 extending in the longitudinal direction of the vehicle body.

  Centered on the left and right kick-up frames 10 are center floor panels 13 that are provided on the front side of the vehicle body from the rear floor panel 3 and incline downward from the vehicle body rear side toward the vehicle body front side. A front floor panel 14 provided on the front side of the vehicle body from the center floor panel 13 is installed. In the vehicle body 1, a vehicle compartment is provided on the front floor panel 14.

  The kick-up frame 10 is formed in a substantially hat-shaped cross section, is attached to the lower surface side of the center floor panel 13, and forms a closed cross section that cooperates with the center floor panel 13 and extends in the longitudinal direction of the vehicle body. The front floor frame 11 is formed in a substantially hat-shaped cross section and is attached to the lower surface side of the front floor panel 14, and forms a closed cross section that cooperates with the front floor panel 14 and extends in the longitudinal direction of the vehicle body.

  A plurality of cross members 15 extending in the vehicle width direction and spaced apart from each other in the vehicle body front-rear direction and extending between the left and right front floor frames 11 are attached to the lower surface side of the front floor panel 14.

  As shown in FIG. No. 4 between the left and right front floor frames 11 on the vehicle body front side of the cross member 4. Three cross members 15 are installed. No. The three cross members 15 are formed in a substantially hat-shaped cross section, are attached to the lower surface side of the front floor panel 14, and form a closed cross section extending in the vehicle width direction in cooperation with the front floor panel 14. For other cross members installed between the left and right front floor frames 11, no. It is formed in the same manner as the three cross member 15.

  The vehicle body 1 is also provided with a fuel tank 21 for storing fuel to be supplied to the engine disposed at the front of the vehicle body, and sound generated when the engine exhaust gas is discharged to the atmosphere through an exhaust pipe 24 extending from the engine to the vehicle body rear side. An exhaust silencer 25 is provided to reduce the above.

  As shown in FIG. 1, the fuel tank 21 has a no. 3 cross member 15 and No. 3 4 between the cross member 4 and the fuel tank 21 on the vehicle body front side and vehicle body rear side through the mounting brackets 22 and 23, respectively. 3 cross member 15 and No. 3 4 Attached to the cross member 5.

  The exhaust silencer 25 is located under the rear floor panel 3 at the rear of the vehicle body. 5 It is arranged on the vehicle body rear side and vehicle body lower side from the cross member 5 and extends between the left and right rear side frames 2 and is formed in a substantially flat cross section. At both ends of the exhaust silencer 25 in the vehicle width direction, rod-like members 26 are fixed to the front side of the vehicle body and the rear side of the vehicle body by welding or the like, and the rod-like member 26 has elastic members 27 such as rubber formed in a cylindrical shape. It is attached.

  The elastic member 27 is held by a support bracket 28 which is formed in a U-shaped cross section along the outer periphery of the elastic member 27 and has flange portions extending outward at both ends. The support bracket 28 is attached to the lower surface side of the left and right rear side frames 2. Thereby, the exhaust silencer 25 is supported by the rear side frame 2.

  As shown in FIG. 5, the vehicle body 1 also includes a jack bracket 30 with which the garage jack 17 is brought into contact, for example, during maintenance work. As shown in FIG. 1, the jack bracket 30 is disposed on the lower side of the rear floor panel 3 on the center side in the vehicle width direction and is offset in the vehicle width direction with an exhaust pipe 24 extending in the vehicle body front-rear direction.

  The jack bracket 30 is No. 5 No. 5 so as to protrude from the cross member 5 to the lower side of the vehicle body. 5 is coupled to the cross member 5, 5 The cross member 5 is disposed so as to overlap in the longitudinal direction of the vehicle body.

  FIG. 6 is a perspective view of the jack bracket. 7 is a front view, a side view, and a bottom view of the jack bracket, and FIGS. 7A, 7B, and 7C are a front view, a side view, and a bottom view of the jack bracket, respectively. is there. 6 and 7 also show a reinforcing member. The jack bracket 30 is formed by press-molding a metal plate material such as a high-tensile steel plate.

  As shown in FIGS. 4 to 7, the jack bracket 30 includes a lower surface portion 31 extending in a direction orthogonal to the vehicle body vertical direction, and a side surface portion 32 on the vehicle body front side extending from the vehicle body front side of the lower surface portion 31 to the vehicle body upper side. The vehicle includes a side portion 33 on both sides in the vehicle width direction that extends from both sides in the vehicle width direction of the side portion 32 on the front side of the vehicle body to the vehicle rear side.

  The side portions 33 on both sides are no. The rear upper end portion 33a on the rear side of the vehicle body is formed lower than the front upper end portion 33b on the front side of the vehicle body in accordance with the height to the lower surface portion 5a of the five cross member 5. Further, a groove 33c that is recessed in a semicircular shape from the rear upper end 33a toward the lower surface 31 is provided between the rear upper end 33a and the front upper end 33b.

  As will be described later, when the impact load from the rear of the vehicle body is applied, the groove portions 33c provided in the side surface portions 33 are provided when the lower side of the vehicle body of the jack bracket 30 is pushed out to the front side of the vehicle body by the exhaust silencer 25. The vehicle body lower side 30 is provided so as to be easily deformed to the vehicle body front side.

  The jack bracket 30 also extends from the upper end of the side portion 32 on the front side of the vehicle body to the front side of the vehicle body, and from the front upper end portion 33b of the side portions 33 on both sides in the vehicle width direction outward of the vehicle width direction. A second flange portion 36 extending, and a third flange portion 37 extending outward in the vehicle width direction from the rear upper end portion 33a of the side surface portion 33 on both sides in the vehicle width direction are provided.

  A reinforcing member 40 for reinforcing the jack bracket 30 is also attached to the jack bracket 30. The reinforcing member 40 is formed by press-molding a metal plate material such as a high-tensile steel plate.

  The reinforcing member 40 is disposed apart from the side surface portion 32 on the vehicle body front side of the jack bracket 30 toward the vehicle body rear side, and is disposed between the vehicle body front sides of the side surface portions 33 on both sides in the vehicle width direction of the jack bracket 30. A vertical surface portion 41 extending in a substantially vertical direction is provided.

  The reinforcing member 40 also includes a first flange portion 42 extending from the upper end portion of the vertical surface portion 41 toward the vehicle body rear side, a second flange portion 43 extending from the lower end portion of the vertical surface portion 41 toward the vehicle body rear side, and the vehicle width of the vertical surface portion 41. And third flange portions 44 on both sides extending from the both ends in the direction to the vehicle body rear side.

  In the reinforcing member 40, the second flange portion 43 is overlapped and fixed by welding or the like along the lower surface portion 31 of the jack bracket 30, and the third flange portions 44 on both sides are side surface portions 33 on both sides of the jack bracket 30 in the vehicle width direction. Are overlapped along the rear side of the vehicle body and fixed by welding or the like, and are attached to the jack bracket 30.

  In the jack bracket 30 to which the reinforcing member 40 is attached, the third flange portion 37 of the jack bracket 30 and the first flange portion 42 of the reinforcing member 40 are No. 5 Overlaid along the lower surface portion 5a of the cross member 5 and fixed by welding or the like, and the first flange portion 35 and the second flange portion 36 of the jack bracket 30 are overlapped along the rear floor panel 3 and fixed by welding or the like. It is attached to the vehicle body 1.

  In this way, the jack bracket 30 is No. 5 No. 5 so as to protrude from the cross member 5 to the lower side of the vehicle body. 5 The cross member 5 and the rear floor panel 3 are joined together.

  In the jack bracket 30, as shown in FIG. 5, the garage jack 17 is brought into contact with the lower surface portion 31 during maintenance work, for example. 5 The vehicle body rear side of the side surface portion 33 on both sides in the vehicle width direction coupled to the cross member 5 is reinforced by the reinforcing member 40.

  The exhaust silencer 25 described above is disposed on the rear side of the vehicle body from the jack bracket 30, and the exhaust silencer 25 is disposed so as to face the lower side of the vehicle body of the jack bracket 30.

  In the vehicle body 1, the jack bracket 30 is set to No. The exhaust silencer 25 is provided so as to push the lower side of the jack bracket 30 toward the front side of the vehicle body when an impact load is applied from the rear side of the vehicle body.

  FIG. 8 is an explanatory diagram for explaining deformation of the rear portion of the vehicle body at the time of a rear collision. As shown in FIG. 8 (a), when an impact load is applied to the vehicle body 1 from the rear of the vehicle body via the impactor 50 as an impactor disposed at the rear of the vehicle body 1, the impactor 50 moves to the front side of the vehicle body. Then, the rear part of the vehicle body is deformed, and the exhaust silencer 25 is moved to the front side of the vehicle body as shown in FIG.

  When the exhaust silencer 25 is moved to the front side of the vehicle body, the exhaust silencer 25 is disposed so as to face the lower side of the vehicle body of the jack bracket 30, so that the lower side of the vehicle body of the jack bracket 30 is moved to the front side of the vehicle body by the exhaust silencer 25. The jack bracket 30 is pushed and rotated to the front side of the vehicle body around the upper side of the vehicle body of the jack bracket 30.

  When the impactor 50 is further moved forward of the vehicle body, the rear portion of the vehicle body is further deformed, and as shown in FIG. 8C, the jack bracket 30 is rotated and moved by approximately 90 degrees so as to extend in the vehicle body front-rear direction. The lower surface portion 31 of the jack bracket 30 is No. 4 Cross member 4, specifically No. 4 The four cross members 4 are abutted against the side surface portion 4b on the vehicle body rear side.

  In the vehicle body 1, when an impact load is applied from the rear of the vehicle body, 5 is connected to the cross member 5 and The jack bracket 30 abutted against the four cross member 4 is stretched in the longitudinal direction of the vehicle body, and the deformation of the rear portion of the vehicle body can be suppressed to prevent the rear portion of the vehicle body from entering the vehicle interior.

  In the present embodiment, the jack bracket 30 is No. 1 when an impact load is applied from the rear of the vehicle body. 4 The abutting member that abuts against the cross member 4 is configured, and the exhaust silencer 25 configures an extrusion member that pushes the lower side of the jack bracket 30 toward the front of the vehicle body when an impact load is applied from the rear of the vehicle body. The lower surface portion 31 of No. 30 is 4 An abutting portion that abuts against the cross member 4 is formed.

  As described above, the rear vehicle body structure of the vehicle according to the present embodiment includes the abutting member 30 coupled across the rear cross member 5 and the rear floor panel 3 so as to protrude from the rear cross member 5 to the vehicle body lower side. A pushing member 25 that pushes the lower side of the abutting member 30 toward the front side of the vehicle body when an impact load is applied from the rear of the vehicle body, and the abutting member 30 is located on the lower side of the abutting member 30 by the pushing member 25. An abutting portion 31 that abuts against the front cross member 4 when it is pushed forward and rotated is provided.

  Thus, when an impact load from the rear of the vehicle body is applied, the abutting member 30 that is coupled across the rear cross member 5 and the rear floor panel 3 and abutted against the front cross member 4 can be stretched in the vehicle longitudinal direction. Therefore, it is possible to suppress the deformation of the rear portion of the vehicle body and prevent the rear portion of the vehicle body from entering the vehicle interior, and to improve the safety of passengers in the vehicle interior at the time of a rear collision.

  Further, the abutting member 30 is a jack bracket, and the pushing member 25 is an exhaust silencer, so that an occupant in the vehicle interior can be used by using the jack bracket and the exhaust silencer mounted on the vehicle without providing a dedicated member. Safety can be improved.

  FIG. 9 is a bottom view of a vehicle body to which the rear vehicle body structure according to the second embodiment of the present invention is applied. The vehicle body to which the rear body structure of the vehicle according to the second embodiment is applied is the same as the vehicle body 1 according to the first embodiment except that a deformation promoting portion is provided on the rear side frame. Is omitted.

  As shown in FIG. 9, in the vehicle body 51 to which the rear vehicle body structure according to the second embodiment is applied, the rear side frame 2 has a No. 4 Cross member 4 and No. 4 Between the portions to which the five cross members 5 are connected, a deformation promoting portion 2d for accelerating the deformation of the rear side frame 2 in the axial direction when an impact load is applied from the rear of the vehicle body is provided. In FIG. 9, the deformation promoting part 2d is indicated by hatching.

  In the rear side frame 2 ', the deformation promoting portion 2d is formed to be thinner than the other portion 2e excluding the deformation promoting portion 2d, and has a lower strength against axial compression than the other portion 2e other than the deformation promoting portion 2d. Has been. Thereby, when a load is applied to the rear side frame 2 when an impact load from the rear of the vehicle body is applied to the rear side frame 2 ′, the deformation promoting portion 2d promotes deformation of the rear side frame 2 in the axial direction, and the deformation promoting portion 2d. The deformation promoting portion 2d is crushed and deformed in the axial direction before the other portions 2e except for crush and deform.

  In the rear side frame 2, the deformation promoting portion 2d is formed thinner than the other portion 2e excluding the deformation promoting portion 2d so that the strength against axial compression is set low, thereby deforming the rear side frame 2 in the axial direction. Although it is promoted, the deformation in the axial direction of the rear side frame 2 is promoted by using a steel plate having a lower tensile strength than the other portion 2e except the deformation promoting portion 2d and setting the strength against axial compression low. You may make it do. In addition, a bellows portion may be formed as the deformation promoting portion 2d of the rear side frame 2 so as to promote the axial deformation of the rear side frame 2.

  In the vehicle body 51, the jack bracket 30 has a length L1 (see FIG. 5) in the vehicle body up-and-down direction from the portion coupled to the rear floor panel 3 to the lower surface portion 31. 4 Cross member 4 and No. 4 The distance L2 between the cross member 5 and the distance L2 obtained by subtracting the length L3 of the deformation promoting portion 2d in the longitudinal direction of the vehicle body (L2-L3) is provided.

  When an impact load is applied to the vehicle body 51 configured in this manner from the rear of the vehicle body, the exhaust silencer 25 is moved to the front side of the vehicle body as in the case of the vehicle body 1, and the vehicle body lower side of the jack bracket 30 is moved to the vehicle body side by the exhaust silencer 25. The jack bracket 30 is pushed forward, and the jack bracket 30 is rotated and moved to the front side of the vehicle body with the upper side of the jack bracket 30 as the center.

  Then, the jack bracket 30 that has been rotated by the lower side of the vehicle body pushed forward by the exhaust silencer 25 is rotated by approximately 90 degrees so as to extend in the longitudinal direction of the vehicle body, and the lower surface portion 31 of the jack bracket 30 is No. . 4 Abutted against the cross member 4.

  In the vehicle body 51, when a load is input to the rear side frame 2 from the rear side of the vehicle body, the left and right rear side frames 2 are deformed in the axial direction by deformation deformation portions 2d being deformed in the longitudinal direction of the vehicle body. 4 Cross member 4 and No. 4 The distance between the cross member 5 and the cross member 5 is shortened according to the deformation of the deformation promoting portion 2d. 4 Abutted against the cross member 4.

  As described above, the rear body structure of the vehicle according to the present embodiment is also coupled across the rear cross member 5 and the rear floor panel 3 and abutted against the front cross member 4 when an impact load is applied from the rear of the vehicle body. Since the abutting member 30 can be stretched in the longitudinal direction of the vehicle body, the rear part of the vehicle body can be prevented from being crushed and the rear part of the vehicle body can be prevented from entering the vehicle interior. Can be improved.

  Further, the rear side frame 2 is provided with a deformation promoting portion 2d that promotes deformation of the rear side frame 2 between the portions to which the front and rear cross members 4 and 5 are connected, so that the abutting member 30 is pushed out. Even when there is a gap between the member 25 and the front cross member 4 when it is rotated and moved, the deformation promoting portion 2d is crushed and deformed in the axial direction so that the abutting portion 31 becomes the front cross member 4. You can hit it.

  FIG. 10 is a perspective view of a jack bracket for a vehicle body to which the rear vehicle body structure according to the third embodiment of the present invention is applied. Since the vehicle body to which the rear vehicle body structure according to the third embodiment is applied is the same as the vehicle body 1 according to the first embodiment except that the jack bracket is different, the description of the same configuration is omitted.

  As shown in FIG. 10, the jack bracket of the vehicle body to which the rear vehicle body structure of the vehicle according to the third embodiment is applied has a substantially triangular cross section on the front side of the vehicle body on the side surface portion 32 on the front side of the vehicle body in addition to the jack bracket 30. A protruding portion 71 that protrudes is provided.

  The projecting portion 71 is formed by press-molding a metal plate material such as a high-tensile steel plate, and has a predetermined angle toward the front of the vehicle body toward the vehicle body lower side with respect to the side surface portion 32 of the jack bracket 30 on the vehicle body front side. θ, for example, an upper inclined surface portion 72 that is inclined at a predetermined angle between 30 degrees and 60 degrees, and a predetermined angle θ toward the vehicle body front side toward the vehicle body upper side with respect to the side surface portion 32 of the jack bracket 30 on the vehicle body front side. For example, a lower inclined surface portion 73 inclined at a predetermined angle between 30 degrees and 60 degrees is provided, and the lower end portion of the upper inclined surface portion 72 and the upper end portion of the lower inclined surface portion 73 are connected to form a substantially triangular cross section. Has been.

  The upper inclined surface portion 72 of the protruding portion 71 is provided with an upper flange portion 74 extending from the upper end portion of the upper inclined surface portion 72 to the vehicle body upper side, and the lower inclined surface portion 73 of the protruding portion 71 is provided with the lower inclined surface portion 73. A lower flange portion 75 extending from the lower end portion to the vehicle body lower side is provided, and the upper flange portion 74 and the lower flange portion 75 are fixed to the side surface portion 32 of the jack bracket 30 on the vehicle body front side by welding or the like.

  Also in the vehicle body according to the present embodiment, when an impact load is applied from the rear of the vehicle body, the exhaust silencer 25 is moved to the vehicle body front side, and the vehicle body lower side of the jack bracket 30 is moved to the vehicle body front side by the exhaust silencer 25. The jack bracket 30 is rotated to the front side of the vehicle body with the upper side of the jack bracket 30 as the center.

  Then, the jack bracket 30 that has been rotated by the lower side of the vehicle body pushed forward by the exhaust silencer 25 is rotated by approximately 90 degrees so as to extend in the longitudinal direction of the vehicle body, and the lower surface portion 31 of the jack bracket 30 is No. . 4 Abutted against the cross member 4.

  FIG. 11 is an explanatory diagram for explaining another modification of the rear portion of the vehicle body at the time of a rear collision. In the vehicle body according to this embodiment, as shown in FIG. 11A, when an impact load is applied from the rear of the vehicle body via the impactor 50, the impactor 50 is moved to the front side of the vehicle body and the exhaust silencer 25 is moved. As shown in FIG. 11 (b), the jack bracket 30, which is moved to the front side of the vehicle body by the exhaust silencer 25 and pushed downward by the exhaust silencer 25, is rotated on the rear floor panel 3. The protrusion 71 of the jack bracket 30, specifically, the lower inclined surface 73 of the protrusion 71 is designated as No. even when it is not rotationally moved until it extends in the longitudinal direction of the vehicle body due to the luggage mounted in the chamber. 4 Abutted against the cross member 4.

  In the present embodiment, the jack bracket 30 is No. 1 when an impact load is applied from the rear of the vehicle body. No. 4 at the time of the action of the lower surface portion 31 as the first butting portion butted against the cross member 4 and the impact load from the rear of the vehicle body. 4 is provided with a projecting portion 71 projecting to the front side of the vehicle body provided on the side surface portion 32 on the front side of the vehicle body as a second butting portion to be abutted against the cross member 4.

  The rear body structure of the vehicle according to the present embodiment also includes an abutting member 30 coupled across the rear cross member 4 and the rear floor panel 3 so as to protrude from the rear cross member 4 to the lower side of the vehicle body, and the rear of the vehicle body. And an extruding member 25 that pushes the lower side of the abutting member 30 toward the front side of the vehicle body when an impact load from the vehicle is applied.

  In this embodiment, the abutting member 30 also includes a first abutting portion 32 and a second abutting portion 71 that are abutted against the front cross member 4 when being pushed forward and rotated. The first abutting portion 32 is a lower surface portion of the abutting member 30, and the second abutting portion 71 is a protruding portion that protrudes toward the vehicle body front side provided on the side surface portion 32 of the abutting member 30 on the vehicle body front side. is there.

  Thus, even when the abutting member 30 is not rotated until the lower surface portion 31 of the abutting member 30 as the first abutting portion 32 is abutted against the front cross member 4 when an impact load is applied from the rear of the vehicle body. The projecting portion 71 provided on the side surface portion 32 on the vehicle body front side of the abutting member 30 as the second abutting portion 71 can be abutted against the front cross member 4, and the vehicle body can be prevented from being crushed and deformed. Intrusion into the rear passenger compartment can be suppressed.

  The present invention is not limited to the illustrated embodiments, and various improvements and design changes can be made without departing from the scope of the present invention.

  As described above, according to the present invention, it is possible to improve the safety of occupants in a vehicle compartment at the time of a rear collision in the rear body structure of a vehicle including a cross member installed between the left and right rear side frames. Therefore, it may be suitably used in the manufacturing industry of this type of vehicle.

1, 51 Car body 2, 2 'Rear side frame 2d Deformation promoting part 3 Rear floor panel 4 4 cross member (front cross member)
5 No. 5 cross member (rear cross member)
25 Exhaust silencer (extrusion member)
30 Jack bracket (butting member)
31 Jack bracket bottom surface 32 Jack bracket front side surface portion 71 Jack bracket protrusion

Claims (6)

A pair of left and right rear side frames extending in the longitudinal direction of the vehicle body at the rear part of the vehicle body, a rear floor panel installed on the pair of left and right rear side frames, extending in the vehicle width direction on the lower surface side of the rear floor panel and spaced apart in the longitudinal direction of the vehicle body A vehicle rear body structure comprising a front cross member and a rear cross member installed between a pair of left and right rear side frames,
An abutting member that is coupled across the rear cross member and the rear floor panel so as to project downward from the rear cross member toward the vehicle body, and abuts against the front cross member when an impact load is applied from the rear of the vehicle body; ,
An extrusion member that is disposed on the vehicle body rear side from the abutting member and pushes the vehicle body lower side of the abutting member to the vehicle body front side when an impact load is applied from the vehicle body rear side;
With
The abutting member includes an abutting portion that is abutted against the front cross member when the vehicle body lower side of the abutting member is pushed out to the vehicle body front side by the pushing member and rotated.
A vehicle body structure for a rear portion of a vehicle. The rear side frame includes a deformation promoting portion that promotes deformation of the rear side frame between portions to which the front cross member and the rear cross member are respectively connected.
The rear body structure of the vehicle according to claim 1. The abutting member has a length from a portion coupled to the rear floor panel to the abutting portion, the distance in the vehicle longitudinal direction from the distance between the front cross member and the rear cross member in the vehicle longitudinal direction. Provided to be less than the distance minus the length of the deformation promoting portion,
The rear body structure of the vehicle according to claim 2. A pair of left and right rear side frames extending in the longitudinal direction of the vehicle body at the rear part of the vehicle body, a rear floor panel installed on the pair of left and right rear side frames, extending in the vehicle width direction on the lower surface side of the rear floor panel and spaced apart in the longitudinal direction of the vehicle body A vehicle rear body structure comprising a front cross member and a rear cross member installed between a pair of left and right rear side frames,
An abutting member coupled across the rear cross member and the rear floor panel so as to protrude from the rear cross member to the vehicle body lower side;
An extrusion member disposed on the vehicle rear side from the abutting member and on the vehicle body lower side from the rear cross member, and extending in the vehicle width direction between the pair of left and right rear side frames;
With
The abutting member includes an abutting portion that abuts against the front cross member,
The rear side frame includes a deformation promoting portion between portions to which the front cross member and the rear cross member are connected,
The abutting member has a length from a portion coupled to the rear floor panel to the abutting portion, the distance in the vehicle longitudinal direction from the distance between the front cross member and the rear cross member in the vehicle longitudinal direction. Provided to be less than the distance minus the length of the deformation promoting portion,
A vehicle body structure for a rear portion of a vehicle. The abutting member includes a first abutting portion and a second abutting portion that are abutted against the front cross member when the vehicle body lower side of the abutting member is pushed to the vehicle body front side by the pushing member and rotated. With
The first butting portion is a lower surface portion of the butting member,
The second butting portion is a projecting portion that projects to the vehicle body front side provided on the side surface portion of the butting member on the vehicle body front side.
The vehicle rear body structure according to any one of claims 1 to 4, wherein the vehicle body structure is a rear body structure. The abutting member is a jack bracket against which a jack is abutted,
The push member is an exhaust silencer disposed on the vehicle body rear side from the jack bracket.
The rear body structure of a vehicle according to any one of claims 1 to 5, wherein the vehicle body structure is a rear body structure.

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