JP4539320B2 - Mounting structure of tow hook for vehicle - Google Patents

Description

  The present invention relates to a mounting structure for a vehicle traction hook configured such that the traction hook for a vehicle is attached to a traction hook mounting portion supported by a bumper reinforcement of the vehicle.

Conventionally, as shown in Patent Document 1 below, a bumper stay formed in a substantially box shape is arranged substantially coaxially at the end of a side member (body frame) disposed in the front-rear direction of the vehicle body at the front or rear portion of the vehicle body. A hook stay (traction hook mounting part) is arranged in the front-rear direction across the end surface of the bumper stay on the outside of the vehicle and the mounting wall facing it, and a vehicle tow hook can be attached to this hook stay. In this structure, one end of the hook stay is fixed to the outer end of the bumper stay, while the other end is attached to the mounting wall of the bumper stay so as to be movable in the front-rear direction. 2. Description of the Related Art A structure for attaching a tow hook for an automobile is known.
JP 2003-2136 A

  In the tow hook mounting structure for an automobile disclosed in Patent Document 1 described above, when an axial collision load acts on the towing hook and the hook stay during a front-rear collision of the vehicle, the end wall on the outer side of the bumper stay is applied to the collision load. In addition, the bumper stay is plastically deformed while being guided by the hook stay, so that there is an advantage that the impact energy at the time of collision can be efficiently absorbed. On the other hand, when the hook stay is pushed in the longitudinal direction of the vehicle body according to the collision load, the hook stays on the vehicle body side member composed of a shroud panel or a rear end panel disposed opposite to the inner end of the vehicle. Due to the contact of the stay (tow hook attaching portion), there is a problem that the vehicle body side member is easily damaged, and the cost required for repairing the vehicle body increases.

  The present invention has been made in view of the above-described problems, and effectively prevents the occurrence of a situation in which the traction hook mounting portion comes into contact with the vehicle body side member and the vehicle body side member is damaged at the time of a vehicle collision. An object of the present invention is to provide a mounting structure for a vehicle traction hook.

The invention according to claim 1 is a pair of left and right rear side frames arranged to extend in the front-rear direction of the vehicle body at both left and right side portions of the vehicle body, and an end of both the rear side frames arranged to extend in the vehicle width direction. A vehicle traction hook mounting structure configured such that the vehicle traction hook is attached to a traction hook mounting portion supported by the bumper reinforcement. The bumper reinforcement includes a reinforcement main body and an impact absorbing member serving as a mounting portion to the vehicle body, and is configured to be attached to a rear end portion of a rear side frame via a rear end panel. Reinforcement where the tow hook mounting part faces the rear surface of the rear end panel Are installed so as to straddle on the body and the shock-absorbing member, causes offset to the vehicle body on the lower side than the vertical center of the rear side frame in the vertical center of the bumper reinforcement, the bumper support position of the traction hook mounting portions It is offset from the vertical center of the reinforcement to the upper side of the vehicle body .

According to the invention of claim 1, to prevent the above traction hook mounting portion moves largely to the front side of the vehicle body upon collision of the vehicle effectively, the end portion of the traction hook mounting portions or Riyaendopane Le Ranaru It is possible to effectively suppress the occurrence of a situation in which the vehicle body side member is damaged due to contact with the vehicle body side member, and there is an advantage that it is possible to prevent the cost required for repair of the vehicle body from increasing. .

In addition, the mounting bracket can be plastically deformed at the time of rear-end collision of the vehicle, so that impact energy can be effectively absorbed with a simple structure, and the front end portion of the traction hook mounting portion is a vehicle body side member formed of a rear end panel. There is an advantage that occurrence of a situation in which the vehicle body side member is damaged due to contact can be effectively suppressed.

Furthermore, while securing a wide space for installing a muffler, a fuel tank, etc. below the rear floor panel, the upper side of the bumper reinforcement in which the tow hook mounting portion is installed at the time of a vehicle collision with a simple configuration is provided. By preventing the large deformation, the occurrence of a situation in which the vehicle body side member is damaged due to the front end portion of the traction hook mounting portion coming into contact with the vehicle body side member formed of the rear end panel can be effectively suppressed. There is an advantage.

1 to 4 show a rear body structure of a vehicle provided with a tow hook mounting structure for a vehicle according to an embodiment of the present invention. The rear vehicle body includes a pair of left and right rear side frames 1 arranged to extend in the front-rear direction of the vehicle body on both left and right sides of the vehicle body, a rear floor panel 2 installed on the upper portion of the rear side frame 1, and the rear side frame 1. And a rear end panel 3 disposed on the rear surface side. On the rear surface side of the rear end panel 3, rear bumper reinforcements 4 that connect the rear ends of the rear side frames 1 are disposed so as to extend in the vehicle width direction, and are provided at both left and right ends thereof. A rear bumper face 6 is disposed on the rear side of the rear bumper reinforcement 4 and is attached to the rear end portion of the rear side frame 1 via a mounting bracket 5.

  The rear side frame 1 includes a frame body 1a having a U-shaped cross section having a pair of left and right side wall portions and a bottom wall portion connecting the lower end portions thereof, and a pair of left and right upper end flange portions 1b provided at the upper end portions thereof. And a rear end flange portion 1c provided at the rear end portion of the frame body 1a. The upper end flange 1b is fixed to the lower surface of the rear floor panel 2 by means such as spot welding. A rear bumper reinforcement 4 is detachably joined to the rear end portion of the rear side frame 1 by, for example, bolting the mounting bracket 5 via the rear end panel 3 to the rear end flange portion 1c. Yes.

  The rear bumper reinforcement 4 includes an upper wall portion 4a, a rear wall portion 4b extending downward from the rear end thereof, a bottom wall portion 4c extending forward from the lower end thereof, and an upper portion extending from the front end of the upper wall portion 4a. The upper flange 4d and the lower flange 4e extending downward from the front end of the bottom wall 4c have a reinforcement body 4A formed in a substantially hat-shaped cross section. The upper flange 4d and the lower flange 4e The mounting bracket 5 is fixed to the front surface of the housing by means such as welding.

  The mounting bracket 5 includes a pair of left and right recessed portions 5a and 5a recessed into the front side of the vehicle body, and a rear wall portion 5b having a predetermined width provided so as to connect the inner side portions of both recessed portions 5a and 5a. And a pair of left and right mounting flange portions 5c, 5d projecting outward from the rear outer sides of the recessed portions 5a, 5a. The rear wall portion 5b and the mounting flange portions 5c, 5d Is fixed to the front surface of the upper flange portion 4d and the lower flange portion 4e of the reinforcement body 4A by means such as welding. The mounting bracket 5 also has a function as an impact absorbing member that absorbs impact energy by plastic deformation at the time of rear-end collision of the vehicle, which will be described later.

  The rear wall portion 5b of the mounting bracket 5 is provided with an installation hole 7a for the tow hook mounting portion 7 (see FIG. 5), and the rear wall portion 4b of the reinforcement body 4A has a tow hook mounting portion. 7 installation holes 7b are formed, and the tow hook attaching portion 7 is disposed so as to penetrate these installation holes 7a and 7b. The traction hook mounting portion 7 is formed of a cylindrical body having a screw hole into which the vehicle traction hook 8 is screwed, and a rear end portion of the traction hook attachment portion 7 from the rear wall portion 4b of the reinforcement body 4A to the rear side of the vehicle body. The rear wall portion 4b is welded to the rear wall portion 4b, and the front end portion of the traction hook mounting portion 7 projects from the rear wall portion 5b of the mounting bracket 5 to the front side of the vehicle body. By being welded, the rear end panel 3 is installed so as to straddle the reinforcement main body 4A of the rear bumper reinforcement 4 and the mounting bracket 5 at a position facing the rear surface of the rear end panel 3.

  Further, the rear bumper face 6 is formed with an insertion hole for the vehicular traction hook 8 at a portion corresponding to the installation position of the traction hook mounting portion 7, and a cap 9 for closing the insertion hole is attached. . With the cap 9 removed, as shown in FIG. 2, the vehicle traction hook 8 is screwed into the screw hole of the traction hook mounting portion 7 so that the vehicle traction hook 8 is attached to the traction hook. It can be detachably attached to the attachment portion 7.

As shown in FIG. 6, the vertical center of the rear bumper reinforcement 4 (axial center passing through the vertical center of the bumper reinforcement main body 4A) 4B is the vertical center of the rear side frame 1 (vertical direction of the rear side frame 1). (Axis center passing through the center) 1A is arranged to be offset to the lower side of the vehicle body.

In this embodiment, the upper end surface of the rear side frame 1 and the upper end surface of the rear bumper reinforcement 4 are installed at substantially the same height, and the vertical dimension of the rear bumper reinforcement 4 is larger than the vertical dimension of the rear side frame 1. By setting a large value, the vertical center 4B of the rear bumper reinforcement 4 is offset to the lower side of the vehicle body with respect to the vertical center 1A of the rear side frame 1 . The mounting bracket 5 is formed so that the side wall of the mounting bracket 5 is narrowed forward, so that the vertical dimension of the front wall surface attached to the rear side frame 1 is relative to the vertical dimension of the rear wall surface attached to the rear bumper reinforcement 4. Is set to a small value.

  Further, by installing the tow hook mounting portion 7 on the upper side of the vehicle body with respect to the vertical center 4B of the rear bumper reinforcement 4, the tow hook mounting portion 7 with respect to the vertical center 4B of the rear bumper reinforcement 4 is provided. The support position 7A is offset in the direction opposite to the offset direction of the bumper reinforcement 4 with respect to the rear side frame 1.

  In the above configuration, when a rear-end collision such as the rear part of the vehicle collides with an obstacle when the vehicle moves backward or another vehicle collides with the rear end part of the own vehicle, the side wall of the mounting bracket 5 is While being crushed to the front side of the vehicle body and plastically deforming, the rear bumper reinforcement 4 is compressed and plastically deformed, so that the impact energy at the time of the rear impact is absorbed. Therefore, it is possible to effectively prevent the rear side frame 1 and the rear end panel 3 from being deformed at the time of a light collision with a relatively small impact energy, thereby reducing the repair cost at a low cost.

In a vehicle arranged so that the vertical center 4B of the rear bumper reinforcement 4 is offset to the lower side of the vehicle body with respect to the vertical center 1A of the rear side frame 1, the vertical center of the rear bumper reinforcement 4 is provided. Since the support position 7A of the tow hook mounting portion 7 with respect to 4B is disposed so as to be offset in the direction opposite to the offset direction of the bumper reinforcement 4 with respect to the rear side frame 1 (upward side of the vehicle body), it is disposed below the rear floor panel 2. While securing a wide space for installing a muffler, a fuel tank, and the like, there is an advantage that the vehicle body can be effectively protected from a load acting at the time of rear collision with a simple configuration.

  That is, by offsetting the vertical center 4B of the rear bumper reinforcement 4 to the lower side of the vehicle body with respect to the vertical center 1A of the rear side frame 1, the vertical dimension of the rear side frame 1 is not increased more than necessary. The rear floor panel 2 installed on the upper surface can be positioned on the upper side of the vehicle body, and a wide space for installing a muffler, a fuel tank, and the like can be secured on the lower side. In addition, since the lower end portion of the rear bumper reinforcement 4 is disposed at a position relatively lower than the rear side frame 1, the vehicle body comes into contact with the protrusions on the road when the vehicle moves backward. There is an advantage that the rear bumper reinforcement 4 can effectively prevent the occurrence of a situation in which the main body of the vehicle body is damaged due to the above.

  Further, at the time of rear-end collision of the vehicle, a portion of the rear bumper reinforcement 4 below the vertical center 4B is provided with a compression load K with one point on the vertical center 4B as a virtual action point, and the rear side frame 1 Since the moment M centered on the virtual fulcrum S on the vertical center 1A acts in the direction of compressing the lower side portion of the rear bumper reinforcement 4, the lower side portion tends to be greatly deformed. . On the other hand, in the portion above the vertical center 4B of the rear bumper reinforcement 4, there is a compression load K with one point of the vertical center 4B as a virtual action point and the vertical center 1A of the rear side frame 1. Since the bending moment M centering on the virtual fulcrum S acts in a direction that cancels each other, the deformation amount of the upper side portion of the rear bumper reinforcement 4 at the time of the rear impact is smaller than that of the lower side portion. .

  Therefore, by arranging the tow hook mounting portion 7 on the upper side of the vehicle body with respect to the upper and lower centers 4B of the rear bumper reinforcement 4, the tow hook mounting portion is applied according to the collision load acting at the time of the rear collision of the vehicle. 7 is effectively prevented from greatly moving to the front side of the vehicle body, and the rear end panel 3 is damaged due to the front end portion of the traction hook mounting portion 7 coming into contact with the vehicle body side member formed of the rear end panel 3. Occurrence of the situation can be effectively suppressed, and there is an advantage that it is possible to prevent the cost required for repairing the vehicle body from increasing.

Further, as shown in the above embodiment, the rear bumper reinforcement 4 is attached to the rear end portion of the rear side frame 1 via the rear end panel 3, and the reinforcement body 4A is attached to the vehicle body side member. The bracket 5 has a function as an impact absorbing member, and the tow hook mounting portion 7 is installed so as to straddle the reinforcement body 4A and the mounting bracket 5 at a position facing the rear surface of the rear end panel 3. In such a case, the mounting bracket 5 can be plastically deformed at the time of rear-end collision so that impact energy can be effectively absorbed with a simple configuration. This effectively prevents contact with the rear end panel 3 by moving to There is an advantage that the occurrence of a situation that the ya end panels 3 damage can be suppressed.

In the above embodiment, in the vehicle configured such that the vertical center 4B of the rear bumper reinforcement 4 is offset to the lower side of the vehicle body with respect to the vertical center 1A of the rear side frame 1 , the rear bumper reinforcement is described above. Although the example in which the support position 7A of the traction hook mounting portion 7 with respect to the vertical center 4B of 4 is offset to the upper side of the vehicle body has been described, the vertical center 4B of the rear bumper reinforcement 4 is set to the vertical center 1A of the rear side frame 1. On the other hand, in a vehicle arranged to be offset to the upper side of the vehicle body, by offsetting the support position 7A of the traction hook mounting portion 7 with respect to the vertical center 4B of the rear bumper reinforcement 4 to the lower side of the vehicle body, The rear end panel 3 has a simple structure, depending on the load that acts during rear impact. It is possible to effectively suppress the occurrence of a situation that Sonsuru.

  Further, the rear end portion of the tow hook attaching portion 7 is welded to the rear wall portion 4b in a state of protruding from the rear wall portion 4b of the reinforcement body 4A to the rear side of the vehicle body, and the tow hook attaching portion 7 The front end portion is welded to the rear wall portion 5b in a state where the front end portion protrudes from the rear wall portion 5b of the mounting bracket 5 to the front side of the vehicle body, so that the reinforcement body 4A is positioned at a position facing the rear surface of the rear end panel 3. Instead of the above-described embodiment installed so as to straddle the shock absorbing member composed of the mounting bracket 5, the upper wall portion 4 a of the reinforcement body 4 </ b> A is supported without the mounting bracket 5 supporting the traction hook mounting portion 7. And it is good also as a structure supported by the rear wall part 5b.

7 to 10, the left and right side portions of the vehicle body and the front side frame 1 1 disposed a pair so as to extend in the longitudinal direction of the vehicle body, disposed has been both front side frames so as to extend in the vehicle width direction 11 is a front vehicle body including a front bumper reinforcement 12 that connects the front end portions of the front end frame 11 and a shroud panel 13 made of synthetic resin that is disposed between the front side frames 11. A front bumper face 15 having a traveling wind introduction port 14 formed on the side is disposed, and the front bumper reinforcement 12 is curved upward so as to avoid the traveling wind introduction port 15 so as to avoid the traveling wind introduction port 15. 12 at least the vertical center 12A of the central portion in the left-right direction, The front side frame 11 is offset from the vertical center 11A to the upper side of the vehicle body. Further, the shroud panel 13 is configured such that a vehicle device including a radiator 16 and a condenser 17 is attached.

  The front bumper reinforcement 12 includes a reinforcement body 12A having a substantially U-shaped cross section having an upper wall portion 12a, a front wall portion 12b, and a bottom wall portion 12c, and mounting brackets 18 attached to both left and right end portions thereof. The left and right ends of the reinforcement body 12A are detachably attached to the front end of the front side frame 11 via the mounting bracket 18. In addition, a pair of left and right traction hook attachment portions 19 are supported via support brackets 20 at predetermined positions of the reinforcement body 12A. The support position 19A of the tow hook mounting portion 19 is set on the upper side portion of the reinforcement body 12A so as to be offset from the vertical center 12B of the front bumper reinforcement 12 to the lower side of the vehicle body.

  According to this configuration, the traveling wind introduced into the front vehicle body introduced from the traveling wind inlet 14 of the front bumper face 15 during traveling of the vehicle is not obstructed by the front bumper reinforcement 12, and the radiator 16 and the condenser 17 and the like are smoothly supplied to be effectively cooled.

  When a frontal collision such as the front of the vehicle collides with an obstacle when the vehicle moves forward, or the front end of the host vehicle collides with another vehicle, the upper center 12A of the bumper reinforcement 12 is more On the upper side, both the compression weight K with one point on the vertical center 12A as a virtual action point and the moment M about the virtual fulcrum S on the vertical center 4B of the front bumper reinforcement 12 are the front bumper. The upper side portion of the reinforcement 12 acts in the direction of compression, and the upper side portion tends to be greatly deformed. On the other hand, on the lower side portion of the front bumper reinforcement 12 on which the tow hook mounting portion 19 is installed, a compression load K having one point on the vertical center 12B as a virtual action point and a front bumper. Since the moment M centered on the virtual fulcrum of the vertical center 12B of the reinforcement 12 acts in a direction that cancels each other, the traction hook mounting portion 19 disposed on the lower side portion of the front bumper reinforcement 12 is Thus, it is possible to effectively prevent a large movement toward the rear side of the vehicle body in accordance with a collision load that acts during a frontal collision of the vehicle.

  Therefore, at the time of a light collision with a relatively small collision load, the front end portion of the traction hook mounting portion 19 comes into contact with a vehicle device including the radiator 16 and the condenser 17 or a vehicle-side panel member including the shroud panel 13. Thus, it is possible to effectively suppress the occurrence of a situation where they are damaged and to prevent an increase in the cost required for repairing the vehicle body.

It is side surface sectional drawing which shows the rear vehicle body provided with the attachment structure of the tow hook for vehicles which concerns on embodiment of this invention. It is a plane sectional view of a front body. It is a front view which shows the specific structure of a rear bumper reinforcement. It is a partial notch front view which shows specific structures, such as a mounting bracket. It is a perspective view which shows the specific structure of an end panel and a mounting bracket. It is side surface sectional drawing which shows the action state of a collision load. It is side surface sectional drawing which shows the front vehicle body provided with the attachment structure of the traction hook for vehicles which concerns on a reference example . It is a top view which shows specific structures, such as a front bumper reinforcement. It is a front view which shows specific structures, such as a front bumper reinforcement. It is side surface sectional drawing which shows the action state of a collision load.

1 the rear side frame 1A rear side frame in the vertical center 3 rear end panel 4 rear bumper reinforcement 4A reinforcement body 4B rear bumper reinforcement of the upper and lower center 5 mounting bracket (impact absorbing member)
7 Towing hook mounting portion 7A Vertical center of towing hook mounting portion 8 Vehicle towing hook

Claims (1)

A pair of left and right rear side frames arranged to extend in the front-rear direction of the vehicle body on both left and right sides of the vehicle body, and a bumper reinforcement that is arranged to extend in the vehicle width direction and connects the ends of the two rear side frames. A tow hook mounting structure for a vehicle configured to be attached to a tow hook mounting portion supported by the bumper reinforcement,
The bumper reinforcement includes a reinforcement main body and an impact absorbing member serving as a mounting portion to the vehicle body, and is configured to be attached to a rear end portion of a rear side frame via a rear end panel. The tow hook mounting part is installed so as to straddle the reinforcement body and the shock absorbing member at a position facing the rear surface of the rear end panel.
The vertical center of the bumper reinforcement is offset to the lower side of the vehicle body from the vertical center of the rear side frame, and the support position of the tow hook mounting portion is offset to the upper side of the vehicle body from the vertical center of the bumper reinforcement. A structure for mounting a tow hook for a vehicle characterized by the above.

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