JP5215936B2 - Shock absorption structure at the rear of the vehicle - Google Patents

Description

  The present invention relates to a shock absorbing structure at the rear of a vehicle for absorbing collision energy.

  As an impact absorbing structure at the rear of the vehicle for absorbing the collision energy, for example, a rear side member extending in the vehicle front-rear direction, a rear bumper extending in the vehicle width direction, and a rear side member and a rear bumper are disposed. In addition, there is a lower back panel that extends longer than the height of the rear side member and the rear bumper (see Patent Document 1). In this shock absorbing structure at the rear of the vehicle, when another vehicle having a different vehicle height collides with the rear of the vehicle, the lower back panel can receive the load at the time of the collision, and the lower back panel has received it. The load can be transmitted to the rear side member.

JP 2007-8346 A

  However, in the invention described in Patent Document 1, the lower back panel is a pair of columnar members disposed on both sides in the vehicle width direction and is not disposed on the center side in the vehicle width direction. However, the collision energy may not be absorbed well.

  Therefore, the present invention has been developed from such a viewpoint, and an object of the present invention is to provide a shock absorbing structure for the rear portion of a vehicle body that can absorb collision energy well in a wide range.

  In order to solve the above-mentioned problems, the present invention provides a shock absorbing structure for a rear part of a vehicle body for absorbing collision energy generated when another vehicle collides with the rear part of the vehicle, and includes a trunk opening formed in the rear part of the vehicle body. A trunk body that covers the trunk body; a trunk upper frame that is attached to the trunk body and extends in a vehicle width direction; at least one trunk center frame that is attached to the trunk body and extends in a vertical direction; A rear cross member disposed below the main body and extending in the vehicle width direction and a rear end portion thereof are joined to the front end portion of the rear cross member, extending in the vehicle front-rear direction and spaced apart in the vehicle width direction. When the pair of rear side frames arranged at the bottom and the lower end thereof are joined to the vehicle crosswise end of the rear cross member and extend in the vertical direction A pair of trunk side frames that are spaced apart from each other in the vehicle width direction, and the rear cross member and the trunk side frame are provided with engaged members, and the trunk upper frame Engaging members that can be engaged with engaged members of the trunk side frame at the time of a collision are provided at both ends in the vehicle width direction, and the rear cross member is covered at the lower end side of the trunk center frame at the time of a collision. An engagement member that can be engaged with the engagement member is provided.

  According to the present invention, the trunk upper frame and the trunk center frame are attached to the trunk body, and when other vehicles collide, the engaging members provided on both ends of the trunk upper frame in the vehicle width direction are the trunk side frames. The engaging member provided on the lower end side of the trunk center frame engages with the engaged member provided on the rear cross member, so that it can be engaged with the engaged member provided. Since the load input to the trunk body can be reliably transmitted to the vehicle body skeleton, the collision energy can be absorbed well in a wide range.

  The “body frame” means “rear cross member, rear side frame and trunk side frame”.

  Further, an engaged member is further provided at the lower end of the trunk side frame, and an engaging member that can be engaged with the engaged member at the time of a collision is provided below the end of the trunk body in the vehicle width direction. Is preferably provided. In this case, the engaging member and the engaged member are arranged in the vicinity of the rear side frame, so that the load input to the trunk body is applied to the rear side frame via the engaging member and the engaged member. Since it is easy to transmit, the rear side frame is more likely to buckle and deform.

  According to the present invention, collision energy can be absorbed well in a wide range.

It is a rear view of the impact absorption structure of the vehicle rear part which concerns on this embodiment. It is the XX sectional view taken on the line of FIG. It is the YY sectional view taken on the line of FIG. FIG. 2 is a sectional view taken along line ZZ in FIG. 1. It is a perspective view which shows the structure of the catcher mechanism which concerns on this embodiment. (A) is a schematic side view which shows the state before and after a load is added in the conventional vehicle body rear part structure, (b) is a schematic side view which shows the state before and after a load is applied in the shock absorption structure of the vehicle body rear part of this invention. FIG. (A)-(c) is a rear view which shows the structure of the trunk center frame which concerns on a modification. (A)-(b) is sectional drawing which shows the structure of the trunk upper frame which concerns on a modification. (A) is a perspective view which shows the structure of the catcher mechanism which concerns on a modification, (b) is sectional drawing which shows the attachment state of the catcher mechanism which concerns on a modification. (A)-(b) is sectional drawing which shows the attachment state of the catcher mechanism which concerns on a modification.

  Embodiments of the present invention will be described in detail with reference to the drawings. In the description, the same elements are denoted by the same reference numerals, and redundant description is omitted. Hereinafter, vehicle C is used as a reference for front and rear, up and down, left and right. The left-right direction and the vehicle width direction refer to the same direction.

  The shock absorbing structure A at the rear of the vehicle according to the present embodiment is a structure applied to the rear of a sedan-type vehicle having a trunk, for example, and absorbs collision energy generated when another vehicle collides with the rear of the vehicle. It is a structure for.

  As shown in FIG. 1, the shock absorbing structure A at the rear of the vehicle according to the present embodiment includes a rear bumper 1, a pair of rear side frames 2, 2, a rear cross member 3, a pair of trunk side frames 4, 4, and a trunk. The main body 5, the trunk upper frame 6, the trunk center frame 7, and the four catcher mechanisms 8, 8.

  As shown in FIGS. 1 and 2, the rear bumper 1 extends in the vehicle width direction and is disposed below the trunk body 5. As shown in FIG. 2, the outer surface of the rear bumper 1 projects rearward from the outer surface of the trunk body 5. A rear panel 9 is disposed in front of the rear bumper 1.

  The pair of rear side frames 2 and 2 are members that absorb the collision energy by buckling deformation when another vehicle collides, and are arranged apart from each other in the vehicle width direction as shown in FIG. ing. As shown in FIG. 2, the rear side frame 2 extends in the front-rear direction of the vehicle C, and the rear end 2 a is joined to the front end 3 a of the rear cross member 3.

  The rear cross member 3 is formed in a closed cross section by joining a plurality of panels including the rear panel 9. As shown in FIGS. 1 and 2, the rear cross member 3 extends in the vehicle width direction and connects the left and right rear side frames 2 and 2. On the upper surface 3b of the rear cross member 3, a striker 31 as an engaged member is provided.

  As shown in FIG. 1, the pair of trunk side frames 4, 4 face each other with the trunk upper frame 6 interposed therebetween. That is, the pair of trunk side frames 4, 4 are arranged apart from each other in the vehicle width direction. The trunk side frame 4 extends in the vertical direction, and is inclined outward in the vehicle width direction with respect to the vertical axis. A lower end 4 a of the trunk side frame 4 is joined to the upper surface 3 b of the rear cross member 3. Further, as shown in FIGS. 3 and 4, a catcher bracket 81 which is an engaged member is provided at an appropriate position of the trunk side frame 4.

  The trunk body 5 is a member that covers a trunk opening (not shown) formed in the rear part of the vehicle C so as to be openable and closable. As shown in FIG. The trunk panel 52 is mainly configured. As shown in FIG. 4, a catcher hook 82 that can be engaged with a catcher bracket 81 provided on the trunk side frame 4 is provided below the end portion 5 c of the trunk body 5 in the vehicle width direction. A hollow portion 5 b is formed between the trunk skin 51 and the trunk panel 52. A trunk upper frame 6 and a trunk center frame 7 are disposed in the hollow portion 5b. As shown in FIG. 1, the trunk upper frame 6 and the trunk center frame 7 of the present embodiment have a T shape.

  As shown in FIGS. 1 and 2, the trunk upper frame 6 is composed of a round pipe (hollow member) and extends in the vehicle width direction. As shown in FIG. 2, the trunk upper frame 6 is disposed above the rear bumper 1 and the rear cross member 3, and is fixed to the trunk panel 52 of the trunk body 5 via the bracket BK1. As shown in FIG. 3, catcher hooks 82 that can be engaged with catcher brackets 81 provided on the trunk side frame 4 are provided on both ends of the trunk upper frame 6 in the vehicle width direction. That is, the trunk upper frame 6 is connected to the vehicle width direction end portion 5 c of the trunk panel 52 via the upper frame bracket 61. A catcher hook 82 is joined to the vehicle width direction end portion 5 c of the trunk panel 52. In other words, the catcher hooks 82 are provided on both ends of the trunk upper frame 6 in the vehicle width direction via the upper frame bracket 61 and the trunk panel 52. The method of attaching the trunk upper frame 6 and the catcher hook 82 is not limited to this. If the load can be transmitted from the trunk upper frame 6 to the catcher hook 82, the trunk upper frame 6 and the catcher hook 82 are attached. Other members may be interposed between them, and the catcher hooks 82 may be directly attached to both ends of the trunk upper frame 6 in the vehicle width direction.

  As shown in FIGS. 1 and 2, the trunk center frame 7 extends in the vertical direction, and is disposed at the center of the trunk upper frame 6 in the vehicle width direction. The trunk center frame 7 is interposed between the rear cross member 3 and the trunk upper frame 6. As shown in FIG. 2, the upper end portion 7 a of the trunk center frame 7 is formed into a curved surface (arc surface) having substantially the same curvature as the trunk upper frame 6, and is joined to the outer surface of the trunk upper frame 6. A lock member 53 that can be engaged with the striker 31 provided on the rear cross member 3 is provided on the lower end side of the trunk center frame 7. That is, the lower end portion 7b of the trunk center frame 7 is fixed to the lower end portion 5a of the trunk body 5 via the bracket BK2. A lock member 53 is fixed to the lower end portion 5 a of the trunk body 5. In other words, the lock member 53 is provided on the lower end portion 7 b of the trunk center frame 7 via the trunk body 5.

The catcher mechanism 8 is installed at the four corners of the trunk body 5 as shown in FIG. As shown in FIGS. 3 to 5, the catcher mechanism 8 includes a catcher bracket 81 disposed on the trunk side frame 4 side and a catcher hook 82 disposed on the trunk body 5 side.
As shown in FIG. 1, since the catcher mechanism 8 is symmetrical, only the right side will be described in the following description, and the description on the left side will be omitted. Further, if unnecessary in terms of performance, the catcher mechanisms 8 and 8 located below the trunk width direction end portion 5c of the trunk body 5 may not be provided.

  As shown in FIGS. 1 and 3, the pair of catcher brackets 81, 81 which are engaged members are disposed apart from each other in the vertical direction, and the inclined surface 4 b of the trunk side frame 4 is interposed via the catcher stiffener 41. It is fixed to. As shown in FIG. 5, the catcher bracket 81 is formed by press-molding a single metal plate. The catcher bracket 81 is formed from a pair of joint portions 81a, 81a that are spaced apart from each other and an inner edge of the joint portion 81a. It is comprised from the standing part 81b, 81b extended toward the trunk main body 5 side (left side), and the main-body part 81c which connects the front-end | tips of a pair of standing part 81b, 81b.

  A bolt insertion hole 81d for inserting the bolt B is formed through the joint portion 81a. The joint portion 81a is fixed to the inclined surface 4b of the trunk side frame 4 with bolts B. The main body portion 81c is separated from the trunk side frame 4 by the rising portion 81b. A space portion 81 e is formed between the main body portion 81 c and the trunk side frame 4. The main body 81c is formed in parallel with the joint 81a.

  The catcher hook 82 that is an engaging member is a member that engages (contacts) the catcher bracket 81 when another vehicle collides with the rear portion of the vehicle. The catcher hook 82 is disposed at a position corresponding to the catcher bracket 81 as shown in FIGS. The catcher hook 82 positioned on the upper side is fixed to the trunk panel 52 of the trunk body 5 via the upper frame bracket 61 as shown in FIG. The catcher hook 82 located on the lower side is fixed to the trunk panel 52 of the trunk body 5 via the catcher hook stiffener 54.

  As shown in FIG. 5, the catcher hook 82 is formed by press-molding a single metal plate and has a substantially L shape. The catcher hook 82 includes a proximal end portion 82a joined to the trunk panel 52 and a distal end portion 82b extending forward from one end of the proximal end portion 82a.

  A bolt insertion hole 82c for inserting the bolt B is formed through the base end portion 82a. The base end portion 82 a is fixed to the trunk panel 52 with bolts B. The distal end portion 82b can be inserted into and removed from the space portion 81e. In other words, the tip 82b is inserted into the space 81e with the trunk body 5 closed, and is removed from the space 81e when the trunk body 5 is opened.

Next, the operation of the shock absorbing structure A at the rear of the vehicle body will be described.
In the drawings to be referred to, FIG. 6A is a schematic side view showing a state before and after a load is applied to a conventional rear part of the vehicle body, and FIG. 6B is a state before and after a load is applied to the rear part of the vehicle body of the present invention. It is a schematic side view which shows.

  As shown in FIGS. 6A and 6B, when another vehicle D whose front bumper FB is higher than the position of the rear bumper 1 of the vehicle C collides, a load P is input to the trunk body 5. However, in the conventional rear structure of the vehicle body, as shown in FIG. 6 (a), the trunk body 5 is connected to the vehicle body only by a lock member (not shown). 5 is greatly deformed or opened. As a result, another vehicle D gets on the vehicle C, and the amount of intrusion into the vehicle increases.

  In contrast, in the present invention, when a load P at the time of collision is input to the trunk body 5, the load P input to the trunk body 5 is transmitted via the trunk center frame 7, the lock member 53, and the striker 31. Then, it is transmitted to the rear cross member 3 and eventually transmitted to the rear side frame 2 (see FIG. 2). Further, the load P is transmitted to the trunk side frame 4 and the rear cross member 3 via the trunk upper frame 6 and the catcher mechanism 8 located on the upper side, and is transmitted to the rear side frame 2 (FIGS. 2 and 3). reference). Furthermore, the load P is transmitted to the trunk side frame 4 and the rear cross member 3 via the catcher mechanism 8 located on the lower side, and is further transmitted to the rear side frame 2 (see FIGS. 2 and 3). As a result, as shown in FIG. 6B, the rear side frame 2 is buckled and can receive the load P. In addition, since the front bumper FB of the other vehicle D is caught by the vehicle C, the other vehicle D can be prevented from getting on the vehicle C, and the amount of intrusion into the vehicle can be reduced.

  According to the impact absorbing structure A at the rear part of the vehicle according to the present embodiment described above, the trunk upper frame 6 and the trunk center frame 7 are attached to the trunk body 5, and when the other vehicle collides, the trunk upper frame 6 Catcher hooks 82 provided on both ends in the vehicle width direction engage with catcher brackets 81 provided on the trunk side frame 4, and a lock member 53 provided on the lower end 7 b side of the trunk center frame 7 includes a rear cross member. By engaging with the striker 31 provided in 3, the load input to the trunk body 5 can be reliably transmitted to the vehicle body skeleton even in the case of an offset collision. Can be absorbed.

  In addition, since the lower catcher mechanism 8 is disposed in the vicinity of the rear side frame 2, the load input to the trunk body 5 is easily transmitted to the rear side frame 2 via the catcher mechanism 8. The rear side frame 2 becomes more easily buckled and deformed.

  As mentioned above, although embodiment of this invention was described in detail with reference to drawings, this invention is not limited to this, In the range which does not deviate from the main point of invention, it can change suitably.

  The trunk center frame 7 of the present embodiment is disposed at the center of the trunk upper frame 6 in the vehicle width direction, but is not limited to this, and the arrangement of components in the hollow portion 5b of the trunk body 5 and the necessary components are not limited thereto. What is necessary is just to set suitably in consideration of a load. For example, as shown in FIG. 7A, the pair of trunk center frames 7 and 7 may be arranged in a V shape. In other words, the pair of trunk center frames 7 and 7 may be disposed so as to be separated from each other as they go from the lock member 53 side toward the trunk upper frame 6 side.

Moreover, as shown in FIG.7 (b), you may arrange | position a pair of trunk center frames 7 and 7 in reverse V shape. In other words, the pair of trunk center frames 7 and 7 may be disposed so as to approach each other as they go from the lock member 53 side toward the trunk upper frame 6 side.
Further, as shown in FIG. 7C, a single trunk center frame 71 is disposed along the vertical direction at the center of the trunk upper frame 6 in the vehicle width direction, and a pair of trunk center frames 72, 72 are provided. You may arrange | position in reverse V shape.

  Moreover, although the trunk upper frame 6 of this embodiment is comprised by the round pipe, it should just set suitably in consideration of cross-sectional strength, an installation space, a manufacturing method, etc., without being limited to this. For example, as shown to Fig.8 (a), it may be comprised with a square pipe, and as shown to FIG.8 (b), you may be comprised by joining two plate-shaped members.

  9 (a) and 9 (b), the catcher mechanism 8 includes a catcher bracket 83 disposed on the trunk side frame 4 side, a catcher pin 84 disposed on the trunk body 5 side, May be configured.

  The catcher bracket 83 which is an engaged member is fixed to the inclined surface 4 b of the trunk side frame 4 via the catcher stiffener 41. The catcher bracket 83 is formed by press-molding a single metal plate. The trunk main body 5 extends from a pair of joint portions 83a and 83a that are spaced apart from each other and the inner edges of the pair of joint portions 83a and 83a. A rising portion 83b extending in an arc shape toward the side, and a receiving portion 83c formed so as to cover the tip of the rising portion 83b.

  A bolt insertion hole 83d for inserting the bolt B is formed through the joint portion 83a. The joint portion 83a is fixed to the inclined surface 4b of the trunk side frame 4 with bolts B. The receiving portion 83c is separated from the trunk side frame 4 by the rising portion 83b. A space portion 83 e is formed between the receiving portion 83 c and the trunk side frame 4. The receiving part 83c is formed in parallel with the joint part 83a. The receiving portion 83c is formed with a recess 83f that opens rearward.

  The catcher pin 84 that is an engaging member is a member that engages (contacts) the catcher bracket 83 when another vehicle collides with the rear portion of the vehicle. The catcher pin 84 is disposed at a position corresponding to the catcher bracket 83. The catcher pin 84 includes a disc-shaped head portion 84a, a columnar shaft portion 84b formed continuously with the head portion 84a and having a smaller diameter than the head portion 84a, and a tip end of the shaft portion 84b. The fixing portion 84c is formed and has a larger diameter than the shaft portion 84b.

  The head portion 84a can be inserted into and removed from the space 83e, and the shaft portion 84b can be inserted into and removed from the recess 83f. In other words, the head portion 84a is inserted into the space 83e with the trunk body 5 closed, and is removed from the space 83e when the trunk body 5 is opened. The shaft portion 84b is inserted into the recess 83f with the trunk body 5 closed, and is removed from the recess 83f when the trunk body 5 is opened. The fixing portion 84 c is fixed to the trunk panel 52 of the trunk body 5 via the catcher hook stiffener 54.

  As shown in FIG. 10 (a), the catcher mechanism 8 includes a catcher bracket 85 disposed on the trunk side frame 4 side and a catcher pin 86 disposed on the trunk body 5 side. Also good.

  The catcher bracket 85 that is an engaged member is formed by press-molding a single metal plate and extends along the opening edge of the opening 4d formed in the rear wall 4c of the trunk side frame 4. It is comprised from the substantially disc shaped junction part 85a and the cylindrical main-body part 85b formed continuously by the inner edge of the junction part 85a.

  The joint portion 85a is fixed to the rear wall 4c of the trunk side frame 4 with bolts (not shown). Further, a hole 85c is formed in the main body 85b.

The catcher pin 86 that is an engaging member is a member that engages (contacts) the catcher bracket 85 when another vehicle collides with the rear portion of the vehicle. The catcher pin 86 is disposed at the end portion 5c of the trunk body 5 in the vehicle width direction, and includes a head portion 86a and a short shaft portion 86b formed continuously with the head portion 86a. The head portion 86 a is fixed to the trunk panel 52 of the trunk body 5 via the catcher hook stiffener 54. The short shaft portion 86b is set so as not to enter the hole 85c when the trunk body 5 is closed, and to enter the recess 85d at the time of a collision.
With such a configuration, when another vehicle collides with the rear part of the vehicle, the pointed end of the short shaft portion 86b is stuck into the trunk side frame 4 and caught, so that the load applied to the trunk body 5 is reliably transmitted to the vehicle body skeleton portion. can do.

  In addition, as shown in FIG.10 (b), you may change the short shaft part 86b into the long shaft part 86c. The long shaft portion 86c has its distal end intruded into the recess 85d from the normal time and is stuck in the trunk side frame 4. Even with such a configuration, the load applied to the trunk body 5 can be reliably transmitted to the vehicle body skeleton.

1 Rear bumper 2 Rear side frame (body frame)
2a Rear end 3 Rear cross member (body frame)
3a Front end 31 Striker (member to be engaged)
4 Trunk side frame (body frame)
4a Lower end portion 5 Trunk body 5a Lower end portion 5c Vehicle width direction end portion 53 Lock member (engaging member)
6 Trunk upper frame 7 Trunk center frame 7a Upper end 7b Lower end 8 Catcher mechanism 81 Catcher bracket (engaged member)
82 Catcher hook (engagement member)
83 Catcher bracket (engaged member)
84 Catcher pin (engagement member)
85 Catcher bracket (engaged member)
86 Catcher pin (engagement member)
9 Rear panel A Shock absorption structure at the rear of the vehicle C Vehicle

Claims (2)

A shock absorbing structure at the rear of the vehicle body for absorbing collision energy generated when another vehicle collides with the rear of the vehicle,
A trunk body covering the trunk opening formed at the rear of the vehicle body so as to be openable and closable;
A trunk upper frame attached to the trunk body and extending in the vehicle width direction;
At least one trunk center frame attached to the trunk body and extending in a vertical direction;
A rear cross member disposed below the trunk body and extending in the vehicle width direction;
A pair of rear side frames whose rear end portions are joined to the front end portion of the rear cross member, extend in the vehicle front-rear direction, and are spaced apart in the vehicle width direction;
A lower end portion thereof is joined to an end portion of the rear cross member in the vehicle width direction and includes a pair of trunk side frames extending in the vertical direction and spaced apart in the vehicle width direction;
The rear cross member and the trunk side frame are provided with engaged members,
Engagement members that can be engaged with engaged members of the trunk side frame at the time of a collision are provided on both ends of the trunk upper frame in the vehicle width direction,
An impact-absorbing structure for a rear portion of a vehicle body, wherein an engagement member that can be engaged with an engaged member of the rear cross member at the time of a collision is provided on a lower end side of the trunk center frame. An engaged member is further provided at a lower end portion of the trunk side frame, and an engagement that can be engaged with the engaged member at the time of a collision is provided below the trunk width direction end portion of the trunk body. The shock absorbing structure for a rear portion of the vehicle body according to claim 1, wherein a member is provided.

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