JP2007290665A - Vehicle body rear part structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle body rear part structure capable of accomplishing a low floor of a vehicle, ensuring an indoor space, ensuring driveability by the low floor even if a trailing arm is adopted, having a short wheel base even if the low floor is adopted, and absorbing load applied to a rear surface by transmitting and dispersing it to a side sill and a mid-cross member even if the low floor is adopted. <P>SOLUTION: The vehicle body rear part structure 11 has a pipe-like rear frame 18 joined to the lower side sill 16 and supports a rear suspension device 23. The rear frame 18 is provided with a kick-up part 31 joined to a rear part of the side sill and inclined to a front part side; and a bracket 72 molded to a pot-like shape projected to an inner side of the kick-up part and connected with the trailing arm. A front part of the rear frame is provided with a triangular base 111 connected to the kick-up part and the side sill. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle body rear structure in which a rear frame included in a rear floor of a passenger compartment is joined to left and right side sills included in a side wall of the passenger compartment, and a rear suspension device is connected to a rear frame in the vicinity of the joint. Is.

The automobile has a suspension device attached to the vehicle body. For example, in a structure in which a rear suspension device is attached to a rear frame, which is a rear part of a vehicle body, there is a structure in which a suspension bracket for the purpose of preventing deformation of the rear frame is adopted, and the suspension device is connected to the suspension bracket (for example, (See Patent Document 1).
Utility Model Registration No. 2580188 (page 4, FIG. 1)

Patent document 1 is demonstrated based on the following figure.
FIG. 9 is a diagram for explaining a basic configuration of a conventional technique. In a conventional lower body structure 201, a rear frame 203 is joined to a side sill 202, and a suspension bracket 205 is attached to a kick-up portion 204 where the rear frame 203 extends upward. Since the suspension frame 206 is attached to the suspension bracket 205 and the rear frame 203, the suspension bracket 205 can prevent the kick-up portion 204 from being deformed.

However, in the lower vehicle body structure 201 of Patent Document 1, it is necessary to set the height of the floor using the side sill 202 to a general height, and it is difficult to employ it in a low-floor vehicle body having a low side sill.
For example, when a trailing arm is employed as the rear suspension device, it is desirable that the mounting position of the front end of the trailing arm that is long in the longitudinal direction of the vehicle is set to be relatively high corresponding to the height of the wheel. In order to attach the suspension bracket 205 to the suspension bracket 205, the height of the side sill 202 and the rear frame 203 from the ground is increased, which makes it difficult to lower the floor of the vehicle.

  In Patent Document 1, when a low floor is adopted, the trailing arm attached to the suspension frame 206 extends rearward, and as a result, the position of the rear wheel moves rearward and the wheel base becomes longer. There is a problem.

  Furthermore, it is necessary to lengthen the length of the front portion 207 of the rear frame 203 attached to the side sill 202 from the viewpoint of securing strength in the case of a rear collision. As a result, the front portion 207 jumps out into the vehicle interior, causing the floor to bulge and narrow the indoor space. In addition, when the trailing arm is employed while maintaining the position of the rear wheel, there is a problem that the suspension frame 206 for attaching the front end of the trailing arm moves forward and the indoor space becomes narrow.

  Even if a trailing arm is used, the steering stability can be ensured by a low floor. Even if a low floor is used, the wheelbase is short. It is another object of the present invention to provide a rear structure of a vehicle body that can be transmitted to a mid-cross member and dispersed and absorbed, thereby reducing the floor of the vehicle and securing an indoor space.

  According to the first aspect of the present invention, in the rear body structure in which the rear frame is joined to the side sill of the vehicle body and the rear frame supports the rear suspension device, the rear frame is inclined toward the front side joined to the rear portion of the side sill. The trailing kick arm is formed, and the trailing arm of the rear suspension device is housed in a pillow shape protruding inward of the kick up portion.

  The invention according to claim 2 is characterized in that the front part of the rear frame has a triangular shape joined to the rear part of the side sill, and has a triangular base connected to the side sill while continuing to the kick-up part. To do.

  The invention according to claim 3 is characterized in that the front portion of the rear frame passes below the mid-cross member that is disposed in front of the kick-up portion and is attached between the side sills.

  In the invention according to claim 4, the bracket for storing the trailing arm includes a trailing arm bracket in which an end of the trailing arm is fixed to be swingable, a color nut having one end attached to the trailing arm bracket, The other end of the color nut is supported, and the trailing arm mounting reinforcing plate is arranged along the trailing arm bracket.

  In the invention according to claim 1, in the vehicle body rear structure in which the rear frame is joined to the side sill of the vehicle body and the rear frame supports the rear suspension device, the rear frame is inclined toward the front side to be joined to the rear portion of the side sill. The trailing arm of the rear suspension device is housed in the pillow shape that protrudes inward from the kick-up portion, so the trailing arm of the rear suspension device is formed in the kick-up portion of the rear frame. Even if the front connecting end is attached and the trailing arm is employed, the height of the rear frame from the ground can be lowered without moving the position of the rear wheel (wheel base) rearward. As a result, even if the trailing arm is used, there is an advantage that the steering stability can be secured by the low floor.

  Also, since the front connection end formed on the trailing arm of the rear suspension device is attached in the kick-up part of the rear frame, the rear wheel should be placed forward compared to the one attached to the rear of the kick-up part. Can do. As a result, the wheelbase can be shortened even if a low floor is adopted.

  In the invention according to claim 2, the front portion of the rear frame has a triangular shape joined to the rear portion of the side sill and is connected to the kick-up portion and has a triangular base connected to the side sill. When a load is applied to the rear surface, the force through the rear bumper is transmitted from the rear frame to the kick-up portion, and finally, it is reliably transmitted from the bottom of the triangular triangle to the side sill. Therefore, even if a low floor is adopted, there is an advantage that the load applied to the rear surface of the vehicle can be reliably transmitted to the side sill and dispersed and absorbed.

  Also, the front part of the rear frame has a triangular shape joined to the rear part of the side sill, and is connected to the kick-up part and has a triangular base connected to the side sill. The swelling is small, the vehicle floor can be lowered, and an indoor space can be secured.

  In the invention according to claim 3, since the front portion of the rear frame passes under the mid-cross member that is disposed in front of the kick-up portion and attached between the side sills, when a load is applied to the rear surface of the vehicle, the rear bumper is interposed. The force is transmitted from the rear frame to the kick-up section, and finally transmitted from the front of the rear frame to the side sill.

  Further, since the front part of the rear frame passes below the mid-cross member disposed at the rear part of the passenger compartment and attached between the side sills, the mid-cross member is not divided by the rear frame. Therefore, when a load is applied to the side surface of the vehicle, the force is reliably transmitted from the side sill to the midcross member. Therefore, even if a low floor is adopted, there is an advantage that the load applied to the side surface of the vehicle can be reliably transmitted to the mid-cross member and dispersed and absorbed.

  In addition, a rear seat is mounted on the mid-cross member. The rear frame has a small bulge into the foot space of the occupant of the rear seat, can reduce the floor of the vehicle, and can secure an indoor space.

  In the invention which concerns on Claim 4, the bracket which accommodates a trailing arm is the trailing arm bracket by which the end of a trailing arm is fixed so that rocking is possible, the color nut by which one end was attached to the trailing arm bracket, Since the other end of the collar nut is supported and the trailing arm mounting reinforcing plate is disposed along the trailing arm bracket, when a load is applied to the rear surface of the vehicle, the force via the rear bumper is applied from the rear frame. As well as being transmitted to the kick-up section, it is also transmitted to the trailing arm bracket, collar nut and trailing arm mounting reinforcement plate that make up the bracket (trailing arm mounting section) mounted in the kick-up section. Even if an opening for taking in There is an advantage that it is possible to enhance the strength of the up section.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a perspective view of the rear body structure of the present invention.
FIG. 2 is a schematic explanatory view of the vehicle body rear structure of the present invention, and shows a state viewed from the rear.

  The vehicle body rear structure 11 is employed in a vehicle body 13 of a vehicle 12, and a rear frame disposed on a side sill 16 that is a lower part of a side body 15 that forms a side wall of a vehicle compartment 14 and an underbody 17 that forms a floor of the vehicle compartment 14. 18, a mid-cross member 21 disposed in the rear portion 19 of the passenger compartment 14 and attached between the side sills 16, and a floor panel 22 of the underbody 17. A rear suspension device 23 is attached to the rear frame 18. .

  In the figure, 24 is a rear seat mounted on the mid-cross member 21, 25 is a rear bumper attached to the rear frame 18, 26 is a rear panel, 27 is a luggage compartment included in the vehicle compartment 14, and 28 is a rear suspension device 23. It is a supported rear wheel.

  The rear suspension device 23 has a trailing arm 32 having one end pivotably connected to the kick-up portion 31 of the rear frame 18.

The side sill 16 is tubular, and includes a side sill inner 35 disposed inside the vehicle compartment 14 and a side sill outer 36 joined to the side sill inner 35 and disposed outside the vehicle compartment 14.
The side sill inner 35 is U-shaped in cross section, and has a lower wall 37 (see also FIG. 7) facing downward, an inner vertical wall 38 connected to the lower wall 37, and an upper side facing the lower wall 37 connected to the inner vertical wall 38. And an upper wall 39 facing the front.
The side sill outer 36 is substantially the same as the side sill inner 35 and includes an upper / lower wall and an outer wall (a wall facing the inner vertical wall 38).

  The rear frame 18 is formed with a front end portion 41 connected to a side sill inner 35 that is inside the side sill 16, and is formed with a kick-up portion 31 that extends upward and is inclined to the front end portion 41. A rear portion 42 is formed which is connected to the kick-up portion 31 and is disposed substantially horizontally at a position higher than the side sill 16. Reference numeral 44 denotes a rear floor pan included in the floor panel 22.

  The front end portion 41 is a portion in which a triangular front end coupling portion 46 (see also FIG. 3) is formed at a front end 45 that is a boundary with an inclination.

  The mid-cross member 21 has left and right end portions 51 and 52 fixed to the side sill 16, a lower side 53 arranged downward, and a front side 54 arranged continuously to the lower side 53 and facing forward. (See also FIG. 5) is formed, a rear side 55 is formed which is connected to the lower side 53 and facing rearward, and an upper side 56 (see also FIG. 5) is formed connected to the front side 54.

FIG. 3 is a diagram for explaining the relationship between the rear structure of the vehicle body and the trailing arm of the present invention, and shows a state viewed from the left rear.
The trailing arm 32 is a front connecting end 62 whose one end of the main body 61 is connected to the rear frame 18, and is a relatively long member that swings up and down together with the rear wheel with the front connecting end 62 as a fulcrum. The front connecting end 62 includes an annular portion 63 and a fastening member 71 fixed to the annular portion 63 via a rubber member 64, and a bracket (tray) on which the fastening member 71 is formed on the kick-up portion 31. It is fastened to the ring arm mounting portion 72 by bolts 73.

FIG. 4 is a plan view of the rear structure of the vehicle body of the present invention, showing the joining of the left side sill and the left rear frame. This will be described with reference to FIG.
Specifically, in the vehicle body rear structure 11, the left end 51 of the midcross member 21 is fixed to the left side sill 16 by spot welding, and a kick-up portion 31 is formed on the lower side 53 of the midcross member 21 through the lower side of the midcross member 21. The front end 45 and the triangular front end joint 46 are joined by spot welding, and the triangular front end joint 46 is joined to the side sill inner 35 of the left side sill 16 by spot welding. A floor panel 22 is attached to the cross member 21.

  A rear end of a floor member 76 disposed in the center of the floor of the passenger compartment 14 and supporting the floor panel 22 below is coupled to the mid-cross member 21.

  The joining of the right side sill 16 (see FIG. 1) and the right rear frame 18 is the same as the joining of the left side sill 16 and the left rear frame 18.

  FIG. 5 is a perspective view of the rear structure of the vehicle body of the present invention, and shows the joining relationship between the side sill 16, the rear frame 18, and the midcross member 21. FIG. Further, a bracket (trailing arm attachment portion) 72 attached in the kick-up portion 31 is shown with the rear floor pan 44 partially broken. This will be described with reference to FIG.

The side sill 16 has a low height from the ground (see FIG. 1) and is disposed at a low position.
The rear frame 18 is also lower in height from the ground and higher than the side sill 16.

Specifically, the mid-cross member 21 is a frame having a height Hm that connects the floor panel 22 of the lower compartment 14 and the rear floor pan 44 of the upper compartment 27, and the left end 51 is located above the side sill 16. The height is lowered in an inclined manner until it abuts against the wall 39. Further, the lower side 53 is disposed at a position about 50% of the height Hs (see FIG. 7) of the side sill 16.
The right end 52 (see FIG. 1) is the same as the left end 51.

FIG. 6 is an exploded view of a rear frame and a bracket included in the vehicle body rear structure of the present invention.
FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 4 and shows the relationship with the trailing arm bracket disposed in the rear frame.
FIG. 8 is a cross-sectional view taken along line 8-8 in FIG. 4 and shows a cross-section of the bracket for the trailing arm disposed in the rear frame. This will be described with reference to FIGS.

The kick-up portion 31 is mainly connected to the inclined base 81 and the inclined base 81, and the outer side 82 joined to the inner vertical wall 38 of the side sill 16 and the rear floor pan 44, and is opposed to the outer side 82 and inclined. The inner side 83 is connected to the base 81 and has a front end joined to the midcross member 21 and an upper end joined to the rear floor pan 44.
An opening 84 through which the front connecting end 62 of the trailing arm 32 passes is opened in the inclined base 81.

  The bracket (trailing arm mounting portion) 72 includes a trailing arm bracket 86 (see also FIG. 3), a collar nut 87, and a trailing arm mounting reinforcing plate 88.

The trailing arm bracket 86 is formed with a fastening seat plate portion 91 that directly contacts the fastening member 71 of the trailing arm 32 and receives a surface pressure from the fastening member 71, and the fastening seat plate portion 91 is connected to the trailing arm 32. In order to avoid interference, the first pillow portion 92 extruded upward is formed.
The fastening seat plate portion 91 has a first front plate portion 94 joined to the triangular front end coupling portion 46, and a mounting hole 95 opened with a diameter through which the bolt 73 (see FIG. 1) is passed. 31 are joined by spot welding to the inclined base 81, the outer side 82, the triangular front end coupling portion 46, and the rear portion 42.

  The trailing arm attachment reinforcing plate 88 is formed with a reinforcing main body portion 97 fixed to a collar nut 87 fixed to the trailing arm bracket 86, and the upper portion of the reinforcing main body portion 97 for accommodating the first sleeper portion 92. The second sleeper portion 98 extruded toward is formed.

  The reinforcing main body portion 97 is a plate disposed substantially in parallel above the fastening seat plate portion 91, and the second front plate portion 101 joined to the triangular front end coupling portion 46 and the mounting hole 95 for the trailing arm bracket 86. And a mounting hole 102 having a diameter that allows the collar nut 87 to pass therethrough, and is coupled by spot welding to the outer side 82, the inner side 83, the triangular front end coupling portion 46, and the rear portion 42 of the kick-up portion 31. is doing.

  The collar nut 87 is formed with a screw to correspond to the bolt 73 in the cylindrical main body portion 105, and an end surface fixed to the back of the trailing arm bracket 86 is formed at one end of the main body portion 105. At the other end, a flange 106 fixed to the back of the trailing arm attachment reinforcing plate 88 is formed.

  The front end coupling portion 46 is a portion in front of the rear frame 18 that passes under the mid-cross member 21 and reaches the side sill 16, and has a triangular cross-section parallel to the floor panel 22. A bracket (trailing arm attachment portion) 72, and a welding margin 112 that is formed on the outer side of the vehicle and is connected to the lower wall 37 of the side sill inner 35 constituting the side sill 16 by spot welding. The inner wall 113 is formed on the inner side of the vehicle and is connected to the triangular base 111 and joined to the bottom surface of the floor panel 22 and the lower side 53 of the midcross member 21.

The inner wall 113 is a part whose height is set to Hf. The height Hf is about 50% of the height Hs of the side sill 16.
The front end coupling portion 46 has a triangular cross-sectional shape, but the triangle is merely an example, and may be a polygon such as a quadrangle.

  Specifically, the side sill 16 is formed to have a height Hs in order to couple the front end coupling portion 46 having a thickness (height) Hf. That is, compared with a general side sill, the height h is extended downward (in the direction of the arrow a1) and set to the height Hs.

Next, the operation of the vehicle body rear portion structure 11 of the present invention will be described.
As shown in FIGS. 1 and 2, in the vehicle body rear structure 11, the side sill 16 is a low floor with a low height from the ground, and even if the mid cross member 21 is joined between the side sill 16, The rear frame 18 can be joined to the side sill 16 and the midcross member 21 by a desired range by the side sill 16 and the triangular front end coupling portion 46 extending downward by a length h (see FIG. 7), and into the vehicle interior. The bulge of the rear frame 18 can be reduced.
As a result, the floor of the vehicle 12 can be reduced, an indoor space can be secured, and the mounting strength of the rear frame 18 to the side sill 16 and the midcross member 21 can be increased.

  As shown in FIGS. 1 to 3, in the vehicle body rear structure 11, a front connection end 62 formed on the trailing arm 32 of the rear suspension device 23 is attached in the kick-up portion 31 of the rear frame 18. Therefore, even if the trailing arm 32 is employed, the height of the side sill 16 from the ground can be lowered without moving the position of the rear wheel 28 (wheel base) rearward. As a result, even when the trailing arm 32 is employed, the steering stability can be ensured by the low floor.

  Further, as shown in FIGS. 1 to 3, in the vehicle body rear structure 11, a front connection end 62 formed on the trailing arm 32 of the rear suspension device 23 is attached in the kick-up portion 31 of the rear frame 18. As a result, the rear wheel 28 can be disposed forward compared to the one attached to the rear of the kick-up portion 31. As a result, the wheelbase can be shortened even if a low floor is adopted.

  As shown in FIGS. 1 to 8, in the vehicle body rear structure 11, the side sill 16 is a low floor having a low height from the ground, and even if the mid cross member 21 is joined between the side sill 16, The rear frame 18 can be joined to the side sill 16 and the mid-cross member 21 within a range of a desired joining area by the side sill 16 and the triangular front end coupling portion 46 extending downward by a length h (see FIG. 7). As a result, when a load F is applied to the rear surface 116 (see FIG. 1) of the vehicle 12, the force via the rear bumper 25 is transmitted through the rear portion 42 of the rear frame 18 as indicated by arrow a2, and the kick-up portion 31 is indicated by arrow a3. Finally, it is reliably transmitted from the triangular front end coupling portion 46 to the side sill 16 as indicated by an arrow a4 (see also FIG. 4 and FIG. 5) and to the mid-cross member 21 by an arrow a5 (FIG. 4 and FIG. 5)). Therefore, even if a low floor is employed, the load applied to the rear surface 116 of the vehicle 12 can be reliably transmitted to the side sill 16 and the midcross member 21 to be dispersed and absorbed.

  Further, in the vehicle body rear structure 11, as shown in FIGS. 1 and 8, the force via the rear bumper 25 is transmitted through the rear portion 42 of the rear frame 18 as indicated by the arrow a2, and to the kick-up portion 31 as indicated by the arrow a3. The trailing arm bracket 86, the collar nut 87, and the trailing arm mounting reinforcing plate 88 constituting the bracket (trailing arm mounting portion) 72 mounted in the kick-up portion 31 are transmitted as indicated by arrows a6 and a7. Therefore, the strength of the kick-up portion 31 can be increased.

  In the rear frame 18, the strength of the kick-up portion 31 can be improved by the bracket (trailing arm attachment portion) 72 even if the opening portion 84 is opened in the inclined base 81 constituting the kick-up portion 31.

  The vehicle body rear structure of the present invention has a low floor and is suitable for a four-wheeled vehicle that employs a trailing arm as a rear suspension device.

Perspective view of the rear body structure of the present invention Outline explanatory diagram of the rear body structure of the present invention The figure explaining the relationship between the vehicle body rear part structure of this invention and a trailing arm Plan view of the rear body structure of the present invention The perspective view of the vehicle body rear structure of the present invention Exploded view of rear frame and bracket included in rear body structure of the present invention Sectional view along line 7-7 in FIG. Sectional view taken along line 8-8 in FIG. The figure explaining the basic composition of conventional technology

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Car body rear structure, 14 ... Car compartment, 16 ... Side sill, 18 ... Rear frame, 19 ... Rear part of vehicle compartment, 21 ... Mid cross member, 23 ... Rear suspension device, 31 ... Kick-up part, 32 ... Trailing arm 72 ... Bracket (trailing arm mounting portion), 86 ... Trailing arm bracket, 87 ... Collar nut, 88 ... Trailing arm mounting reinforcing plate, 111 ... Triangular bottom.

Claims (4)

In the vehicle body rear structure in which the rear frame is joined to the side sill of the vehicle body and the rear frame supports the rear suspension device,
The rear frame is formed with a kick-up portion inclined to the front side joined to the rear portion of the side sill, and the trailing arm of the rear suspension device is housed in a pillow shape protruding inward of the kick-up portion. A vehicle body rear structure characterized by:   The front portion of the rear frame has a triangular shape joined to a rear portion of a side sill, and is provided with a triangular base connected to the side sill while being connected to the kick-up portion. Car body rear structure.   The vehicle body rear part structure according to claim 1 or 2, wherein a front part of the rear frame passes under a mid-cross member disposed in front of the kick-up part and attached between the side sills.   The bracket for storing the trailing arm is supported by a trailing arm bracket in which the end of the trailing arm is swingably fixed, a color nut having one end attached to the trailing arm bracket, and the other end of the color nut. The vehicle body rear structure according to any one of claims 1 to 3, further comprising a trailing arm mounting reinforcing plate disposed along the trailing arm bracket.

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