JP6090219B2 - Vehicle front structure - Google Patents

Description

  The present invention relates to a vehicle front structure.

  A tow hook for towing the vehicle is provided at the front of the vehicle. In this case, in consideration of the design of the bumper cover, there is one in which a traction hook is detachably provided on a traction nut attached to a bumper reinforcement (see Patent Document 1).

  The rear end flange of this traction nut is welded to the lid attached to the front end of the side member. Further, the stepped portion on the tip end side of the traction nut is brought into contact with the inner side surface of the bumper reinforcement, and is screwed with the fixing nut from the outside of the bumper reinforcement, thereby being fastened to the bumper reinforcement.

  In this manner, the vehicle front side of the traction nut is fastened to the bumper reinforcement, so that moment input to the bumper reinforcement is suppressed even when a load is input from the traction hook.

JP 2004-338666 A

  On the other hand, in recent years, fiber reinforced resin (CFRP) has begun to be used for various parts of vehicles in order to reduce the weight of vehicles. When CFRP is applied to bumper reinforcement, it cannot be welded with a metal pulling nut.

  In addition, when the traction nut is fastened to the bumper reinforcement by screwing the traction nut and the fixing nut as in the prior art, a creep phenomenon occurs in the bumper reinforcement made of CFRP due to the axial force of the fastening, and the fastening state is loosened. This causes inconvenience.

  In addition, it is conceivable that the bumper reinforcement made of CFRP is integrated by welding the flange portions of the bumper reinforcement front (front member) and the bumper reinforcement rear (rear member). In this case, if the traction force acts only on the front member, a peeling load may act on the bumper reinforcement (the front member and the rear member), which may cause separation in the front-rear direction. Therefore, it is necessary to receive the traction load by the rear member.

  On the other hand, if the moment that acts in the direction perpendicular to the longitudinal direction of the vehicle during towing is received only by the rear member, the distance from the point of action of the tow hook becomes longer and the moment received by bumper reinforcement becomes too large. It is better to receive.

  Furthermore, if the tip of the traction nut protrudes from the bumper reinforcement toward the front side of the vehicle, there is a disadvantage that the degree of freedom of the design of the bumper cover is impaired.

  From the above viewpoint, when CFRP is used for bumper reinforcement, it is necessary to devise a new fastening method.

  The present invention has been made in consideration of the above facts, and an object of the present invention is to provide a vehicle front structure in which a tow hook can be stably attached to a bumper reinforcement made of resin while ensuring the design of a bumper cover.

  In the first aspect of the present invention, the bumper reinforcement made of resin that extends in the vehicle width direction at the front portion of the vehicle and has the cross-sectional hat-shaped front member and the end portions of the rear member joined to each other, and fixed to the rear member. A traction nut that is provided with a step portion that is in contact with the vehicle rear side surface of the front member, and a convex portion that is formed to protrude from the step portion toward the vehicle front side. A front member is interposed between the main body portion inserted from the vehicle front side of the member and screwed into the traction nut, and the stepped portion provided at the vehicle front side end portion of the main body portion and contacting the convex portion. And a fixing nut having a flange portion to be interposed.

  In the vehicle front structure of the present invention, a traction nut is fixed to the rear member of the bumper reinforcement. Accordingly, when the vehicle is pulled by another vehicle via the tow hook attached to the tow nut, a load is input from the tow hook to the rear member of the bumper reinforcement. Since this load is a load toward the front side of the vehicle, no peeling load acts on the joint portion between the front member and the rear member of the resin bumper reinforcement. That is, peeling of the front member and the rear member can be prevented or suppressed.

  Further, the traction nut is screwed with a fixing nut inserted from the front side of the front member of the vehicle. At this time, the flange portion of the fixing nut is brought into contact with the convex portion of the traction nut. That is, a gap corresponding to the length of the convex portion is formed between the step portion of the pulling nut and the flange portion of the fixing nut, and the front member is interposed in the gap. In this case, since the convex portion of the traction nut receives the axial force due to screwing (fastening), the axial force due to fastening acts on or prevents the front member interposed in the gap. Therefore, the occurrence of a creep phenomenon due to fastening is prevented or suppressed in the resin front member, and loosening of fastening is prevented or suppressed.

  Furthermore, when a moment in the direction perpendicular to the vehicle longitudinal direction acts on the bumper reinforcement from the traction hook via the traction nut, the front member is interposed between the flange portion of the fixed nut and the step portion of the traction nut. The front member can receive a moment when the convex portion of the traction nut comes into contact with the front member. That is, this moment can be applied not only to the rear member of the bumper reinforcement but also to the front member that is close to the tip (action point) of the traction hook.

  Further, the main body portion of the fixed nut is screwed into the traction nut, and the flange portion provided at the vehicle front side end portion of the main body portion is configured to come into contact with the convex portion of the traction nut. Therefore, only the flange portion of the fixing nut is disposed on the front side of the front member of the bumper reinforcement, and the degree of freedom of the design shape of the bumper cover disposed on the front side of the bumper reinforcement is excellent.

  Since this invention set it as the said structure, a tow hook can be stably attached with respect to the member which consists of resin, ensuring the designability of a bumper cover.

1 is a longitudinal sectional view of a vehicle front structure including a vehicle front structure according to an embodiment of the present invention. It is a longitudinal section showing the vehicle front part structure concerning one embodiment of the present invention. It is a longitudinal cross-sectional view which shows the vehicle front part structure which concerns on the 1st reference form of this invention. It is a longitudinal cross-sectional view which shows the vehicle front part structure which concerns on the 2nd reference form of this invention.

[Embodiment]

  A vehicle front structure according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. Hereinafter, in each figure, the arrow FR indicates the front of the vehicle and the arrow UP indicates the upper side of the vehicle. Various members are disposed in the vehicle front structure, but members not related to the gist of the present invention are not shown.

  First, a vehicle front structure will be described, and then a tow hook mounting structure that is a main part will be described.

  As shown in FIG. 1, the vehicle front portion structure 10 includes a pair of side members 12 (only one is shown) extending in the vehicle front-rear direction at both ends in the vehicle width direction, and a crash attached to the tip of each side member 12. A box 14, a bumper reinforcement 16 attached to the tip of the crash box 14 and extending in the vehicle width direction, a tow hook mounting structure 18 including the bumper reinforcement 16, and a front extending in the vehicle width direction in front of the bumper reinforcement 16. And a bumper cover 20.

  The side member 12 is made of metal and has a substantially rectangular cross section in the vehicle width direction. Further, the side member 12 is fastened to the crash box 14 in front of the vehicle via a flange portion 22 at the vehicle front side end.

  The crash box 14 is made of fiber reinforced resin (CFRP) and has a substantially rectangular cross section in the vehicle width direction, and is deformed when a load is input from the front of the vehicle by forming a recess in the outer peripheral surface 14A. It absorbs shocks.

  In the side member 12 and the crash box 14, the flange portions 22 and 24 are fastened by bolts 28 and nuts 30. However, between the bolt 28 and the flange portion 24, a collar member 32 having a main body portion 32 </ b> A inserted into the hole portion of the flange portion 24 and a flange portion 32 </ b> B abutting against the vehicle front side surface of the flange portion 24 is inserted. Has been. The length of the main body portion 32A in the axial direction (vehicle longitudinal direction) is substantially the same as the thickness of the flange portion 24.

  Therefore, when the flange portions 22 and 24 are fastened by the bolt 28 and the nut 30, the axial force is prevented or suppressed from acting on the flange portion 24. As a result, the occurrence of a creep phenomenon due to fastening to the flange portion 24 made of CFRP is prevented or suppressed.

  Further, a housing portion 33 for housing and joining the bumper reinforcement 16 is formed on the vehicle front side of the crash box 14.

  As shown in FIG. 1, the front bumper cover 20 disposed in front of the bumper reinforcement 16 includes an upper cover 20A and a lower cover 20B.

  The lower cover 20B is formed with a hole 34 for inserting a pulling hook 38 described later.

  As shown in FIG. 2, the traction hook attachment structure 18 provided in the vehicle front structure 10 includes a bumper reinforcement 16, a traction nut 36 attached to the bumper reinforcement 16, and a traction that is detachably screwed to the traction nut 36. The hook 38 and the fixing nut 40 for fixing the traction nut 36 to the bumper reinforcement 16 are basically configured.

  As shown in FIG. 2, the bumper reinforcement 16 includes a bumper reinforcement front (hereinafter referred to as “front member”) 42 made of fiber reinforced resin (CFRP) and a bumper reinforcement rear (hereinafter referred to as “front member”). 44).

  As shown in FIG. 2, the front member 42 has a hat shape in cross section when viewed from the side of the vehicle, and has a top wall 42A on the vehicle front side and vertical walls 42B and 42C extending in the vehicle front-rear direction from the end of the top wall 42A. And flange portions 42D and 42E extending in the vehicle vertical direction from the ends of the vertical walls 42B and 42C. Further, the top wall 42A is formed with a mounting portion 42F which is a flat surface extending in the vehicle vertical direction, and a hole 46 is formed at the center thereof.

  On the other hand, the rear member 44 also has a hat shape in cross section when viewed from the side of the vehicle, and has a top wall 44A, vertical walls 44B and 44C, flange portions 44D and 44E, and an attachment portion 44F. A hole 48 is formed at the center of the attachment portion 44F.

  The front member 42 and the rear member 44 are integrated as the bumper reinforcement 16 by welding the flange portions 42D and 42E and the flange portions 44D and 44E.

  The rear member 44 is accommodated in the accommodating portion 33 of the crash box 14, and is joined by an adhesive between the top wall 44 </ b> A and the vertical walls 44 </ b> B and 44 </ b> C of the rear member 44 and the accommodating portion 33. As a result, the bumper reinforcement 16 is fixed to the vehicle front side end portion of the crash box 14 (hereinafter sometimes referred to as “vehicle front end”).

  The metallic traction nut 36 fixed to the bumper reinforcement 16 includes a main body portion 52 having a through hole 50 formed in the vehicle front-rear direction and a flange portion 54 provided at the vehicle rear side end portion of the main body portion 52. Prepare. As shown in FIG. 2, the through-hole 50 includes a first female screw portion 56 formed at the end portion on the rear side of the vehicle and to which the traction hook 38 is screwed, and a first female screw portion on the vehicle front side of the first female screw portion 56. An insertion portion 58 having a diameter larger than that of the screw portion 56 and through which the traction hook 38 is inserted, and a second female screw having a diameter larger than that of the insertion portion 58 and screwed to the fixing nut 40 at the vehicle front side end portion of the insertion portion 58. Unit 60.

  Further, as shown in FIG. 2, the outer peripheral surface of the main body portion 52 of the traction nut 36 has a diameter-expanded portion 62 that is expanded on the front side of the vehicle. A stepped portion 64 having a diameter, and a projecting portion 66 projecting from the stepped portion 64 toward the front side of the vehicle and having an abutting surface 66A formed at the tip thereof are provided. The protrusion amount (length in the vehicle front-rear direction) of the abutting portion 66 protruding from the step portion 64 toward the vehicle front side is substantially the same as the thickness of the attachment portion 42F of the front member 42.

  Further, the flange portion 54 is provided with a plurality of, for example, four, fixing hole portions 68 on the outer peripheral side.

  Further, a hole 70 is provided in the attachment portion 44F of the rear member 44 to which the flange portion 54 is attached, corresponding to the hole 68.

  As shown in FIG. 2, in the state where the flange portion 54 of the traction nut 36 is laminated on the mounting portion 44F of the rear member 44, the body portion 80A of the rivet 80 is inserted into the holes 70 and 68 and crimped, thereby A traction nut 36 is fastened to the member 44.

  On the other hand, the abutting portion 66 at the front end of the traction nut 36 is inserted into the hole 46 of the front member 42, and the stepped portion 64 is brought into contact with the inner surface (rear side of the vehicle) of the mounting portion 42 </ b> F of the front member 42. ing. The outer diameter of the abutting portion 66 is formed slightly smaller than the inner diameter of the hole portion 46.

  On the other hand, a metal fixing nut 40 for fixing the traction nut 36 to the front member 42 is provided with a main body portion 82 extending in the rearward direction of the vehicle and a vehicle front end side of the main body portion 82 and orthogonal to the vehicle longitudinal direction. And a flange portion 84 extending in the direction. On the outer peripheral surface of the main body portion 82, a male screw portion 86 that is screwed with the second female screw portion 60 of the pulling nut 36 is formed. In addition, a hole portion 88 is formed in the center portion of the main body portion 82 so as to penetrate the traction hook 38 through the vehicle longitudinal direction.

  The fixing nut 40 has a main body portion 82 (male thread portion 86) from the front side of the front member 42 on the second side of the traction nut 36 until the flange portion 84 abuts against the abutment surface 66 </ b> A of the abutment portion 66 of the traction nut 36. Screwed into the female screw portion 60.

  As a result, the attachment portion 42F of the front member 42 is interposed between the fixing nut 40 (flange portion 84) and the traction nut 36 (step portion 64). Here, “intervene” means that when the thickness of the mounting portion 42F is slightly larger than the protruding amount of the abutting portion 66, the fixing nut 40 and the traction nut 36 sandwich the thickness of the mounting portion 42F. When the projection amount is 66 or less, it is inserted between the fixing nut 40 and the traction nut 36.

  Furthermore, the tow hook 38 includes a locking portion 92 formed with a locking hole 90 for locking the hook on the front end side of the vehicle, and a bar 94 extending from the locking portion 92 to the vehicle rear side, And a male screw portion 96 provided on the vehicle rear end side of the bar 94. The traction hook 38 is inserted into the through hole 50 of the traction nut 36 attached to the bumper reinforcement 16 from the hole 34 of the lower cover 20B in front of the vehicle, and the male screw portion 96 is screwed with the first female screw portion 56. Is attached to the traction nut 36.

  The operation of the vehicle front structure 10 and the traction hook mounting structure 18 thus configured will be described.

  When pulled by another vehicle via a traction hook 38 attached to the traction nut 36, a load from the traction hook 38 to the traction nut 36 is applied to the front side of the vehicle. At this time, since the flange portion 54 of the traction nut 36 is fastened to the mounting portion 44F of the rear member 44 of the bumper reinforcement 16 by the rivet 80, a load toward the vehicle front side acts on the rear member 44. Therefore, the peeling load does not act on the joint surface between the front member 42 (flange portions 42D and 42E) and the rear member 44 (flange portions 44D and 44E) of the bumper reinforcement 16.

  On the other hand, a moment is applied from the traction hook 38 to the traction nut 36 in a direction perpendicular to the vehicle longitudinal direction (vehicle vertical direction, vehicle width direction, etc.). In this case, the distance from the point of action of the traction hook 38 (the locking portion 92) to the fixing position of the traction nut 36 with respect to the bumper reinforcement 16 (rear member 44) is long, and a large moment acts on the resin bumper reinforcement 16. become. However, in the present embodiment, the attachment portion 42 </ b> F of the front member 42 is interposed between the flange portion 84 of the fixed nut 40 and the stepped portion 64 of the traction nut 36 on the vehicle front end side of the traction nut 36. Therefore, the abutting portion 66 abuts against the attachment portion 42F of the front member 42, so that the moment acting on the bumper reinforcement 16 from the tow hook 38 can be received by the front member 42. As a result, the moment acting on the rear member 44 from the traction hook 38 can be suppressed.

  Furthermore, when the attachment portion 42F of the front member 42 is clamped by fastening the fixing nut 40 and the traction nut 36, an axial force due to fastening acts on the attachment portion 42F of the front member 42 to cause a resin creep phenomenon, and the fastening state is There is a risk of loosening. However, in the present embodiment, the stepped portion 64 provided on the vehicle front end side of the traction nut 36 is brought into contact with the inner surface of the mounting portion 42F, and the abutting surface 66A of the abutting portion 66 is in contact with the flange portion 84 of the fixing nut 40. It is in contact. That is, a gap corresponding to the protruding amount of the abutting portion 66 is secured between the stepped portion 64 of the pulling nut 36 and the flange portion 84 of the fixing nut 40, and the mounting portion 42F of the front member 42 is interposed in the gap. ing. Since the width of the gap is substantially the same as the thickness of the mounting portion 42F, no axial force acts on the mounting portion 42F or only a small amount acts. That is, the occurrence of the resin creep phenomenon in the mounting portion 42F is prevented or suppressed. Therefore, the fastening by the fixing nut 40 and the traction nut 36 is prevented or suppressed from being loosened by the resin creep phenomenon.

  Further, the fixing nut 40 is configured such that the main body portion 82 is inserted into the through hole 50 of the traction nut 36 and screwed into the traction nut 36. Therefore, only the flange portion 84 of the fixing nut 40 is disposed on the vehicle front side surface of the bumper reinforcement 16 and there is nothing that protrudes toward the vehicle front end side. As a result, the degree of freedom of the design shape of the front bumper cover 20 is ensured.

  In addition, although this embodiment demonstrated what was applied with respect to the bumper reinforcement 16 formed with CFRP, if it is resin, it will not be limited to this.

  In the present embodiment, the crash box 14 is also formed of CFRP, but may be formed of other materials, for example, metal.

  Further, the bumper reinforcement 16 may be applied to one directly attached to the side member 12.

  Furthermore, although the rivet 80 is used to fasten the rear member 44 and the traction nut 36, the present invention is not limited to this. For example, it may be fastened with the same bolts and nuts as the front member 42, or a metal collar member 32 may be applied like fastening of the side member 12 and the crash box 14.

  In the present embodiment, the traction hook 38 is detachable from the traction nut 36, but the present invention may be applied to a configuration in which the traction hook 38 is fixed to the bumper reinforcement 16.

[First Reference Form]

  Next, the vehicle front structure according to the first reference embodiment will be described with reference to FIG. In addition, the same referential mark is attached | subjected to the component similar to embodiment, and the detailed description is abbreviate | omitted.

  Also in this reference embodiment, it is preferable to fix the traction nut 36 to the rear member 44 of the bumper reinforcement 16 and to fix the traction nut 36 with the front member 42. Further, it is preferable that the degree of freedom of the design shape of the bumper cover 20 is improved by disposing no traction nut or the like ahead of the vehicle than the front member 42.

  As shown in FIG. 3, in the present embodiment, the vehicle front end portion of the main body portion 52 of the traction nut 36 is slightly attached to the attachment portion 42F of the front member 42 when the traction nut 36 is attached to the attachment portion 44F of the rear member 44. It is said that it does not reach the length.

  The traction nut 36 is fixed to the front member 42 by interposing the adhesive 100 between the vehicle front end portion of the main body portion 52 of the traction nut 36 and the inner surface of the attachment portion 44F of the front member 42.

  Thus, the front end of the main body 52 of the pulling nut 36 can be fixed to the front member 42 made of CFRP by the adhesive 100.

  Further, since the tip of the traction nut 36 does not protrude from the surface (the vehicle front side) of the bumper reinforcement 16 (front member 42), the degree of freedom of the design shape of the front bumper cover 20 can be ensured.

  Furthermore, since a part of the traction nut 36 does not protrude from the surface of the bumper reinforcement 16, the diameter of the hole 46 of the front member 42 can be reduced. That is, the strength reduction of the bumper reinforcement 16 due to the formation of the hole 46 can be suppressed.

[Second Reference Form]

  Next, the vehicle front structure according to the second embodiment will be described with reference to FIG. In addition, the same referential mark is attached | subjected to the component similar to embodiment, and the detailed description is abbreviate | omitted.

  Also in this reference embodiment, it is preferable to fix the traction nut 36 to the rear member 44 of the bumper reinforcement 16 and to receive the moment in the direction perpendicular to the vehicle front-rear direction acting from the traction hook 38 with the front member 42. . Further, it is preferable that the degree of freedom of the design shape of the bumper cover 20 is improved by disposing no traction nut or the like ahead of the vehicle than the front member 42.

  As shown in FIG. 4, in the present embodiment, a step portion 64 that abuts against the inner surface of the attachment portion 42 </ b> F of the front member 42 is provided on the vehicle distal end side of the traction nut 36, and the attachment portion 42 </ b> F is provided on the distal end side of the step portion 64. A convex portion 102 that projects from the hole 46 to the vehicle front end side is provided. The front end side of the traction nut 36 is fixed to the front member 42 by applying an adhesive 100 between the outer peripheral surface 102A of the convex portion 102 and the mounting portion 42F of the front member 42 against which the stepped portion 64 is abutted. doing.

  Thereby, it becomes possible to fix the front-end | tip part of the pulling nut 36 to the front member 42 which consists of CFRP. In particular, since the convex portion 102 is inserted into the hole portion 46, it is easy to ensure the mounting accuracy of the traction nut 36 with respect to the bumper reinforcement 16.

  Further, the moment acting on the bumper reinforcement 16 from the tow hook 38 can be received by the mounting portion 42F of the front member 42, and the moment acting on the rear member 44 from the tow hook 38 can be suppressed.

  Further, since the adhesive 100 is interposed between the outer peripheral surface 102A of the convex portion 102 and the mounting portion 42F of the front member 42 abutted against the stepped portion 64, the inner peripheral surface of the through hole 50 of the traction nut 36. Is prevented from adhering to the adhesive 100. Therefore, when the traction hook 38 is inserted into the through hole 50 of the traction nut 36, the insertion is prevented from being blocked by the adhesive 100.

  Furthermore, since the convex part 102 of the pulling nut 36 protrudes slightly from the attachment part 42F of the front member 42 to the front of the vehicle, a sufficient degree of freedom in the design shape of the bumper cover 20 can be ensured.

DESCRIPTION OF SYMBOLS 10 Vehicle front part structure 16 Bumper reinforcement 36 Pulling nut 38 Pulling hook 40 Fixing nut 42 Bumper reinforcement front (front member)
44 bumper reinforcement (rear member)
64 Step part 66 Abutting part (convex part)
82 Body 84 Flange

Claims (1)

A bumper reinforcement made of resin that extends in the vehicle width direction at the front part of the vehicle and in which the ends of the front member and the rear member having a hat-shaped cross section are joined together,
A tow that is fixed to the rear member and includes a stepped portion that is in contact with the vehicle rear side surface of the front member, and a convex portion that is formed to protrude from the stepped portion toward the front side of the vehicle, and to which a tow hook is attached. With nuts,
A main body portion inserted from the front side of the front member of the front member and screwed into the traction nut, and a front portion of the main body portion provided on the front side of the vehicle portion between the front and the stepped portion. A fixing nut having a flange portion for interposing a member;
A vehicle front structure having:

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