JP4468023B2 - Car body rear structure - Google Patents

Description

The present invention relates to a vehicle body rear structure in which a bumper member is disposed in the vicinity of a lower portion of a lock mechanism capable of locking a rear door in a closed state.

Usually, a door such as a door or a trunk is disposed at the rear of the vehicle. When such a vehicle is collided from the rear, the lock mechanism that locks the door or the door in the closed state during traveling may be damaged by the colliding vehicle. As a result, the doors and the doors are opened, luggage and the like are released, and in the worst case, there is a possibility that passengers may be thrown out, which is very dangerous. For this reason, a technique for controlling the deformation of the vehicle body at the time of rear-end collision of the vehicle from the rear has been proposed (for example, see Patent Document 1 below).
Japanese Unexamined Patent Publication No. 2000-235851 (see paragraphs 0016 and 0017)

  As shown in FIG. 11 (A), the conventional example disclosed in Patent Document 1 has a bumper stay 102 inserted and fixed in the front end opening 101a of the side member 101, and both ends of the reinforcement 103 are attached to the bumper stay 102. In the vehicle bumper mounting structure in which the bent portion 103b is fixed and the bumper stay 102 is formed between the side member insertion portion 104 and the reinforcement fixing portion 105 to form a closed section 106 when viewed in the vertical direction, The wall 110 is formed by extending from the bottom wall 111 of the side member insertion portion 104.

  With such a configuration, as shown in FIGS. 11B and 11C, the reinforcement 103 is deformed so as to eliminate the inclination of the bent portion 103b at the time of the collision between the walls. That is, as shown in FIG. 11C, the end surface of the reinforcement 103 is extended outward by δ. Since the outer wall 110 of the bumper stay 102 extends from the bottom wall 111 of the side member insertion portion 104 and the length of the outer wall 110 is increased, the outer wall 110 is resistant to the deformation of the reinforcement 103. Thus, the tension action is not generated, and the reinforcement fixing portion 105 is pushed outward. For this reason, bending deformation of the front end portion of the side member 101 does not occur, and it is only necessary to replace the bumper stay 102 at the time of repair. In addition, since the length L1 and L2 of the inner wall 109 and the outer wall 110 are equal in the bumper stay 102, the impact load at the time of collision is transmitted to the inner wall 109 and the outer wall 110 evenly. It is possible to prevent the side member 101 from acting in a direction that induces bending.

  However, in this vehicle bumper mounting structure, the bumper stay 102 is only controlled to push down the reinforcement 03, that is, the bumper beam outward in the vehicle body transverse direction. No measures are taken.

  Therefore, the present invention solves such problems in the conventional rear structure of the vehicle body and prevents deformation of the vehicle body so as to prevent damage to the lock mechanism that may cause the rear door or the like to be opened in the event of a rear collision. An object of the present invention is to provide a vehicle body rear structure that can be effectively controlled.

For this reason, the present invention provides a rear body structure in which a bumper member is disposed in the vicinity of a lower portion of a lock mechanism capable of locking the rear door in a closed state, a rear frame extending in the front-rear direction of the vehicle body, and a bumper beam extending in the transverse direction of the vehicle body. A fragile part is formed on the lock mechanism side of the bumper bracket interposed between them , and when a predetermined load is input at the time of a rear collision, the bumper beam is deformed to the lock mechanism side to suppress the release of the lock mechanism It was made to be characterized. Further, the present invention provides a vehicle body rear structure in which a bumper member is disposed in the vicinity of a lower portion of a lock mechanism capable of locking the rear door in a closed state, in a longitudinal direction of the vehicle body in which a bumper beam extending in the transverse direction of the vehicle body is fastened to the rear end. A fragile portion is formed on the locking mechanism side of the extending rear frame, and when a predetermined load is input at the time of a rear collision, the bumper beam is deformed to the locking mechanism side to suppress the opening of the locking mechanism. To do. Further, the present invention provides a vehicle body rear structure in which a bumper member is disposed in the vicinity of a lower portion of a lock mechanism capable of locking the rear door in a closed state, and includes a rear frame extending in the front-rear direction of the vehicle body and a bumper beam extending in the transverse direction of the vehicle body. A weakening is formed on the locking mechanism side of the bumper bracket interposed between them, and in the cross-sectional structure of the bumper beam, when the impact load from the rear is applied, the deformation promotion that promotes the deformation of the bumper beam to the locking mechanism side A portion is formed in the bumper beam. Further, the present invention provides a vehicle body rear structure in which a bumper member is disposed in the vicinity of a lower portion of a lock mechanism capable of locking the rear door in a closed state, in a longitudinal direction of the vehicle body in which a bumper beam extending in the transverse direction of the vehicle body is fastened to the rear end. A fragile portion is formed on the locking mechanism side of the extending rear frame, and a deformation promoting portion for accelerating deformation of the bumper beam toward the locking mechanism side in the cross-sectional structure of the bumper beam is applied to the bumper beam. It is characterized by being formed, and these are used as means for solving the problems.

According to the present invention, in the vehicle body rear structure in which the bumper member is disposed near the lower portion of the lock mechanism capable of locking the rear door in the closed state, the rear frame extending in the front-rear direction of the vehicle body and the bumper beam extending in the transverse direction of the vehicle body are provided. A fragile part is formed on the lock mechanism side of the bumper bracket interposed between them , and when a predetermined load is input at the time of a rear collision, the bumper beam is deformed to the lock mechanism side to suppress the release of the lock mechanism As a result, an impact load is applied to the bumper beam due to a collision from the rear, whereby the bumper bracket is deformed toward the lock mechanism, and a bumper member such as the bumper beam is deformed and moved toward the lock mechanism, thereby closing the lock mechanism. Thereby, it is possible to effectively suppress the locking mechanism from opening the rear door or the like due to the parallax.

Further, in the rear structure of the vehicle body in which the bumper member is disposed in the vicinity of the lower portion of the lock mechanism that can lock the rear door in the closed state, the rear frame that extends in the front-rear direction of the vehicle body is fastened to the rear end with a bumper beam extending in the transverse direction of the vehicle body. The fragile part is formed on the locking mechanism side of the rear, and when a predetermined load is input at the time of rear collision, the bumper beam is deformed to the locking mechanism side to suppress the opening of the locking mechanism. As a result, an impact load is applied to the bumper beam, whereby the rear frame is easily deformed toward the lock mechanism, and a bumper member such as a bumper beam is deformed and moved toward the lock mechanism, thereby closing the lock mechanism. Thereby, it is possible to effectively suppress the locking mechanism from opening the rear door or the like due to the parallax.

Further, in a vehicle body rear structure in which a bumper member is disposed in the vicinity of the lower part of the lock mechanism that can lock the rear door in a closed state, it is interposed between a rear frame that extends in the longitudinal direction of the vehicle body and a bumper beam that extends in the transverse direction of the vehicle body. The bumper bracket is formed with a fragile portion on the lock mechanism side, and the bumper beam has a deformation promoting portion for accelerating deformation of the bumper beam toward the lock mechanism side when a collision load is applied from the rear in the cross-sectional structure of the bumper beam. When the bumper bracket is deformed and moved to the lock mechanism side due to the impact load applied to the bumper beam due to a collision from the rear, the bumper member such as the bumper beam is deformed and moved to the lock mechanism side to close the lock mechanism. to smoothly assisting the bumper beam portion of the vehicle body rear portion of a control function in the fragile portion To enable the door. Furthermore, in the rear structure of the vehicle body in which the bumper member is disposed in the vicinity of the lower portion of the lock mechanism that can lock the rear door in the closed state , the rear that extends in the front-rear direction of the vehicle body is fastened with a bumper beam extending in the transverse direction of the vehicle body at the rear end. A fragile portion is formed on the lock mechanism side of the frame, and in the cross-sectional structure of the bumper beam, a deformation promoting portion is formed on the bumper beam that promotes deformation of the bumper beam toward the lock mechanism side when a collision load is applied from the rear . In this case, an impact load is applied to the bumper beam due to a collision from the rear, so that the rear frame is easily deformed toward the lock mechanism, and a bumper member such as a bumper beam is deformed and moved toward the lock mechanism, thereby closing the lock mechanism. Thereby, it is possible to effectively suppress the locking mechanism from opening the rear door or the like due to the parallax. At this time, the control function of the rear part of the vehicle body in the fragile part can be smoothly assisted in the bumper beam part .

  Moreover, when the said weak part is comprised from the notch part, a weak part can be easily obtained by simple structure by formation of notches, such as an open part. Furthermore, when the fragile portion is formed of a bent portion, the fragile function can be exhibited only when a predetermined or higher impact load is applied while maintaining a certain level of strength.

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment of a vehicle body rear structure according to the present invention. FIG. 1 (A) is a perspective view of a connecting portion between a rear frame and a bumper beam, and FIG. 1 (B) is a crossing of a bumper bracket. 2 is a longitudinal sectional view of the rear part of the vehicle body including the locking mechanism, FIG. 3 is a longitudinal sectional view of the rear part of the vehicle body showing the deformation behavior of the bumper member at the time of rear collision, and FIG. 4 is a sectional view including the lateral section of the bumper bracket. FIG. 5 to 10 are longitudinal sectional views showing second to seventh embodiments. As shown in FIG. 1, the basic structure of the present invention is a rear part of a vehicle body in which a bumper member is disposed in the vicinity of a lower part of a lock mechanism 5 (FIG. 2) that can lock the rear door 6 (FIG. 2) in a closed state. In the structure, a fragile portion 9 is formed on the lock mechanism 5 side of the bumper bracket 2 interposed between the rear frame 1 extending in the front-rear direction of the vehicle body and the bumper beam 3 extending in the transverse direction of the vehicle body . When the load is input, the bumper beam 3 is deformed to the lock mechanism 5 side to prevent the lock mechanism 5 from being opened .

  A first embodiment of the rear body structure of the present invention will be described. As shown in FIG. 2, a door such as a rear door 6 and a hatchback is usually installed at the rear of the vehicle so as to be freely opened and closed. The rear door 6 is fixed and locked at the closed position by the lock mechanism 5. The present invention is configured to effectively prevent the rear door 6 from being opened at the time of a rear collision. As shown in FIG. 1 (A), a pair of rear frames 1 and 1 (not shown on the right side) are disposed on both sides in the front-rear direction of the vehicle body, and orthogonal to the rear frames 1 and 1 at their rear ends. Then, the bumper beam 3 is installed across the vehicle body in the transverse direction. The bumper beam 3 is connected to the rear frames 1 and 1 via a bumper bracket 2 and a bumper stay 7 (not shown in FIGS. 2 and 3). As shown in FIG. 2, the bumper beam 3 is disposed so as to be covered with a bumper skin 4 made of plastic or the like.

  In the present invention, the weakened portion 9 is formed on the bumper bracket 2 on the lock mechanism 5 side (upper portion in the illustrated example). In this embodiment, as shown in FIG. 1B, a bridge member 8 that is a reinforcing member having a certain degree of reinforcing function is provided above the bumper bracket 2 having a U-shaped cross section that opens upward. The bridging member 8 is formed with a fragile portion 9 formed of a cutout portion, whereby the upper portion of the bumper bracket 2 is configured to open as indicated by an arrow when receiving an impact load from the rear (front side of the paper). ing. FIG. 4 is a detailed longitudinal sectional view of FIG. 1 including a cross section of the bumper bracket, and the connection state of each member is understood in detail.

  In the present embodiment, the bumper beam 3 connected to the bumper bracket 2 via the bumper stay 7 has a cross-sectional structure in which the lock mechanism 5 side is a large cross-sectional portion 3A and a lower portion far from the lock mechanism 5 side is a small cross-sectional portion 3B. By making the large cross-sectional portion 3A a rectangular shape that is long in the front and rear direction and the small cross-sectional portion 3B are square, the bumper is applied with a collision load from the rear from the early stage of the collision through the large cross-sectional portion 3A of the bumper beam 3 as will be described later. The fragile portion 9 of the bracket 2 is configured to be able to transmit. Thereby, the control function in the weak part 9 is ensured from the initial stage of the collision.

  The behavior of the rear part of the vehicle body at the time of a collision in this embodiment configured as described above will be described with reference to FIG. When an impact load from the rear of the vehicle body is applied during a rear collision, the bumper skin 4 is crushed. The bumper bracket 2 expands due to the presence of the fragile portion 9 (FIG. 1B), and the upper part on the lock mechanism 5 side is first crushed and deformed. Accordingly, the bumper members such as the bumper beam 3 and the bumper skin 4 are led upward with the lower part of the bumper bracket 2 as the center, and the lower parts of the lock mechanism 5 and the rear door 6 are effectively protected and closed. Therefore, it is possible to effectively prevent the locking mechanism 5 from being broken and the locking of the rear door 6 from being released. At the same time, even if the locking of the locking mechanism 5 may be released, the rear door 6 Since it is obstructed by the bumper member, it does not open up to the delirium.

  FIG. 5 shows a second embodiment of the present invention, and is a detailed longitudinal sectional view of a main part including a transverse section of a bumper bracket. In the present embodiment, the bumper bracket 2 having a U-shaped cross section opened upward is not provided with the bridge member 8 as a reinforcing member as in the above-described embodiment, and is formed by opening the upper portion. The fragile portion 9 is configured on the mechanism 5 side. With such a configuration, the bumper member is deformed upward by an impact load from the rear of the vehicle body, and the lower portions of the lock mechanism 5 and the rear door 6 can be effectively protected and closed.

  FIG. 6 shows a third embodiment of the present invention, and is a detailed longitudinal sectional view of a main part including a transverse section of a bumper bracket. In the present embodiment, a bridge member 8 as a reinforcing member is installed on a bumper bracket 2 having a U-shaped cross section opened upward as in the first embodiment. A bent portion is formed on the member 8 to form a fragile portion 10 that is easily deformed in the front-rear direction. With this configuration, the bridge member 8 that reinforces the U-shaped cross section that is open at the top is easily deformed by an impact load from the rear of the vehicle body, so that the upper part of the bumper bracket 2 is easily deformed, and the bumper member is moved upward. It is possible to effectively protect and close the lock mechanism 5 and the lower part of the rear door 6.

  FIG. 7 shows a fourth embodiment of the present invention, and is a detailed longitudinal sectional view of a main part. In this embodiment, unlike the first to third embodiments, the lock mechanism 5 (FIG. 2) of the rear frame 1 extending in the front-rear direction of the vehicle body is fastened with a bumper beam 3 extending in the transverse direction of the vehicle body at the rear end. The weak part 11 is formed on the side. The fragile portion 11 is formed as a notch, but may be a bent portion or the like. With such a configuration, when an impact load is applied to the bumper beam 3 due to a collision from the rear, the upper portion of the rear frame 1 is easily deformed to the lock mechanism 5 side, and the deformed bumper member causes the lock mechanism 5 and the rear door 6 and the like to be deformed. It is possible to effectively suppress closing and opening.

  FIG. 8 shows a fifth embodiment of the present invention, and is a detailed longitudinal sectional view of the main part. In this embodiment, there is no provision of the bumper beam 3A having a large cross section for ensuring the control function in the fragile portion 9 from the beginning of the collision as in the above embodiments, but in the cross-sectional structure of the bumper beam 3 The bumper beam 3 is formed with deformation promoting portions 3C and 3D that promote deformation of the bumper beam 3 toward the lock mechanism 5 when receiving a collision load from the rear. In this embodiment, the beam is composed of two beams 3A and 3B having substantially the same cross-sectional area, and an inclined surface is formed at the rear end portion of the horizontal plane to form a deformation promoting portion. As a result, the parallelogram deformation of the bumper beam 3 is facilitated, and the deformation of the rear frame 1 toward the lock mechanism 5 by the fragile portion 11 is effectively assisted.

  FIG. 9 shows a sixth embodiment of the present invention, and is a detailed longitudinal sectional view of the main part. In this embodiment, when receiving a collision load from the rear, the parallelogram type deformation of the bumper beam 3 is facilitated, and the deformation of the rear frame 1 toward the lock mechanism 5 by the fragile portion 11 can be effectively assisted. As described above, as the wall surface that divides the first beam 3A and the second beam 3B, an inclined deformation promoting portion 3E is formed, and a large inclined deformation promoting portion 3C is formed at the bottom of the second beam 3B. . With such a configuration, the deformation of the rear frame 1 toward the lock mechanism 5 side by the fragile portion 11 is further effectively assisted with the parallelogram deformation of the bumper beam 3.

  FIG. 10 shows a seventh embodiment of the present invention, and is a detailed longitudinal sectional view of the main part. In this embodiment, when receiving a collision load from the rear, the parallelogram type deformation of the bumper beam 3 is facilitated, and the deformation of the rear frame 1 toward the lock mechanism 5 by the fragile portion 11 can be effectively assisted. As described above, the deformation promoting portion 3C having a small inclination is formed at the bottom of the first beam 3A and the second beam 3B, and the ceiling portion of the first beam 3A is inclined upward, that is, toward the lock mechanism 5 side. . With such a configuration, the parallelogram type deformation of the bun beam 3 is facilitated, and the deformation of the rear frame 1 toward the lock mechanism 5 by the fragile portion 11 is effectively assisted.

  Each embodiment of the present invention has been described above. However, within the scope of the present invention, the shape and type of a door such as a rear door (back door of a wagon car, trunk, vertical swinging type using a horizontal hinge, vertical Left and right swinging type with hinges), shape and form of lock mechanism, shape of weak part (notch, slit, bent part, thin part, low strength material arrangement, etc.) shape of rear frame (square, trapezoid, Multi-chamber cross-section, etc., type, cross-sectional shape (large cross section and small cross-section square shape, substantially the same multi-chamber shape, multiple chambers of different shapes, etc.), shape, form, weakened part (same as above, notch, Bumper bracket shape, including slits, etc., type and form of connection to the bumper beam via the rear frame and bumper stay (adhesion such as welding, bolt fastening, etc.), shape of the deformation promoting part in the bumper beam (Inclined wall, bent portion and the like) and the like can be appropriately selected.

FIG. 1A is a perspective view of a connecting portion between a rear frame and a bumper beam, and FIG. 1B is a cross-sectional view of a bumper bracket. It is a longitudinal cross-sectional view of the rear part of the vehicle body including the lock mechanism. FIG. 6 is a longitudinal sectional view of the rear part of the vehicle body showing the deformation behavior of the bumper member at the time of a rear collision. FIG. 2 is a detailed longitudinal sectional view of FIG. 1 including a transverse section of the bumper bracket. FIG. 6 is a detailed longitudinal sectional view of a main part including a transverse section of a bumper bracket, showing a second embodiment of the present invention. FIG. 6 is a detailed longitudinal sectional view of a main part including a transverse section of a bumper bracket, showing a third embodiment of the present invention. 4 shows a fourth embodiment of the present invention, and is a detailed longitudinal sectional view of an essential part. FIG. FIG. 9 is a detailed longitudinal sectional view of an essential part showing a fifth embodiment of the present invention. FIG. 10 is a detailed longitudinal sectional view of an essential part showing a sixth embodiment of the present invention. 7 shows a seventh embodiment of the present invention, and is a detailed longitudinal sectional view of an essential part. FIG. It is the plane sectional view of the attachment structure of the conventional bumper for vehicles, and the behavior explanatory view at the time of a collision.

Explanation of symbols

1 Rear frame 2 Bumper bracket 3 Bumper beam 3A First beam (large cross section, etc.)
3B 2nd beam (small cross section, etc.)
3C-3E Deformation promotion part 4 Bumper skin 5 Lock mechanism 6 Rear door 7 Bumper stay 8 Bridge member 9 Fragile part (notch part etc.)
10 Vulnerable part (bent part)
11 Weak parts (notches)

Claims (4)

In a vehicle body rear structure in which a bumper member is disposed in the vicinity of the lower portion of a lock mechanism that can lock the rear door in a closed state, it is interposed between a rear frame that extends in the longitudinal direction of the vehicle body and a bumper beam that extends in the transverse direction of the vehicle body. A weak part is formed on the lock mechanism side of the bumper bracket, and when a predetermined load is input at the time of a rear collision, the bumper beam is deformed to the lock mechanism side to suppress the release of the lock mechanism. To do. In the rear structure of the vehicle body in which a bumper member is disposed in the vicinity of the lower part of the lock mechanism that can lock the rear door in the closed state, a rear frame lock that extends in the front-rear direction of the vehicle body with a bumper beam extending in the transverse direction of the vehicle body fastened to the rear end A vehicle body rear structure characterized in that a fragile portion is formed on the mechanism side and the bumper beam is deformed to the lock mechanism side to prevent the lock mechanism from being released when a predetermined load is input during a rear collision . In a vehicle body rear structure in which a bumper member is disposed in the vicinity of the lower portion of a lock mechanism that can lock the rear door in a closed state, it is interposed between a rear frame that extends in the longitudinal direction of the vehicle body and a bumper beam that extends in the transverse direction of the vehicle body. The bumper bracket has a fragile portion on the locking mechanism side, and the bumper beam has a deformation promoting portion for accelerating deformation of the bumper beam toward the locking mechanism side when the bumper beam is subjected to a collision load from the rear. formed car body rear structure you characterized in that the. In the rear structure of the vehicle body in which a bumper member is disposed in the vicinity of the lower part of the lock mechanism that can lock the rear door in the closed state, a rear frame lock that extends in the front-rear direction of the vehicle body with a bumper beam extending in the transverse direction of the vehicle body fastened to the rear end A fragile portion is formed on the mechanism side, and the bumper beam is formed with a deformation promoting portion for accelerating deformation of the bumper beam toward the lock mechanism side when a collision load is applied from the rear in the cross-sectional structure of the bumper beam. car body rear structure shall be the.

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