JP2008080877A - Bumper support structure for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively suppress minute displacement of a bumper reinforcement in the car width direction. <P>SOLUTION: Both end parts 22A in the car width direction of the bumper reinforcement 22 are provided with crash boxes 18 with its longitudinal direction along the longitudinal direction of a vehicle. The crash boxes 18 connect the bumper reinforcement 22 to a lower bag panel 14 (a car body). A front side attaching part 40A of a stay 40 provided inside the crash box 18 in the car width direction is connected to a car width direction inside part 26A of an attaching part 26 serving as a connection part of the crash box 18 with the lower bag panel 14 on the car body side. A rear side attaching part 40B of the stay 40 is connected to a position separated from the crash box 18 attached to the bumper reinforcement 22 via a reinforcing bracket 30 to the car width inside direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a bumper support structure for a vehicle such as an automobile, and more particularly to a vehicle bumper support structure for supporting bumper reinforcement on a vehicle body.

2. Description of the Related Art Conventionally, a vehicle bumper support structure for supporting bumper reinforcement on a vehicle body is known (see, for example, Patent Document 1). In this technology, the front side mounting plate of the bumper stay that connects the bumper reinforcement and the side member extends somewhat to the side of the vehicle body. Moreover, the strut extends from the front side mounting plate toward the bent end portion of the bumper reinforcement, and the end portion of the strut is welded to the upper surface of the bumper stay.
JP 2003-48498 A

  However, in the bumper support structure for a vehicle disclosed in Patent Document 1, the end portion of the strut on the bumper reinforcement side is not fixed to the bumper reinforcement. For this reason, it is not effective for suppressing a minute displacement in the vehicle width direction of bumper reinforcement that occurs as the vehicle travels.

  In view of the above fact, an object of the present invention is to provide a vehicle bumper support structure that can effectively suppress a minute displacement of the bumper reinforcement in the vehicle width direction.

  According to a first aspect of the present invention, there is provided a bumper support structure for a vehicle according to the present invention, wherein a bumper reinforcement arranged in a vehicle width direction in a longitudinal direction at a lower portion of a front-rear direction end of the vehicle, and the bumper reinforcement separated in the vehicle width direction. An energy absorbing member that is supported on the vehicle body at a plurality of locations and deforms in the vehicle longitudinal direction in the event of a vehicle collision, a coupling portion between the energy absorbing member and the vehicle body, and a vehicle width from the energy absorbing member attached to the bumper reinforcement. And a coupling member that couples positions spaced apart in the direction.

  An energy absorbing member that deforms in the longitudinal direction of the vehicle in the event of a vehicle collision is arranged at the lower part of the longitudinal end of the vehicle with the longitudinal direction along the vehicle width direction. I support it. Further, the coupling member couples a coupling portion between the energy absorbing member and the vehicle body and a position spaced in the vehicle width direction from the energy absorbing member attached to the bumper reinforcement.

  For this reason, when the bumper reinforcement is about to be slightly displaced in the vehicle width direction while the vehicle is traveling, the vehicle width direction is determined from the connecting portion between the energy absorbing member and the vehicle body and the energy absorbing member attached to the bumper reinforcement. By the coupling member that couples the positions separated from each other, a minute displacement of the bumper reinforcement in the vehicle width direction is effectively suppressed.

  According to a second aspect of the present invention, in the vehicle bumper support structure according to the first aspect, the coupling member is formed in an elongated shape, and a drag force is reduced against a compressive force in the longitudinal direction of the vehicle at an intermediate portion in the longitudinal direction. It has a weak part.

  When the bumper reinforcement moves to the vehicle body side at the time of a vehicle collision and the connecting member is deformed, the connecting member starts from a fragile part that lowers the drag force against the compressive force in the longitudinal direction of the vehicle provided in the middle part in the longitudinal direction. It bends. For this reason, the energy absorbing member is compressed and deformed in the vehicle front-rear direction.

  According to a third aspect of the present invention, in the vehicle bumper support structure according to the second aspect, the connecting member has a length from the fragile portion to the connecting portion between the energy absorbing member and the vehicle body. Is the sum of the distance along the vehicle width direction from the energy absorbing member to the vehicle body and the distance along the vehicle front-rear direction from the fragile portion to the bumper reinforcement. It is characterized by that.

  When the coupling member bends in the shape of a letter starting from the weak part in the middle in the longitudinal direction, the length from the weak part to the joint part between the energy absorbing member and the vehicle body is the joint part between the weak part and the energy absorbing member and the vehicle body. Is the sum of the distance along the vehicle width direction and the distance along the vehicle front-rear direction from the fragile part to the joint part with bumper reinforcement, so the joint part between the joint member and bumper reinforcement is The vehicle does not move in the vehicle width direction, but moves in the vehicle longitudinal direction. As a result, the energy absorbing member does not fall down and is compressed and deformed.

  According to a fourth aspect of the present invention, in the vehicle bumper support structure according to any one of the first to third aspects, the energy absorbing member attached to the bumper reinforcement and the coupling member are connected. It has a reinforcing member.

  By connecting the energy absorbing member and the coupling member attached to the bumper reinforcement with the reinforcing member, when the bumper reinforcement is about to be displaced slightly in the vehicle width direction while the vehicle is running, the reinforcing member and the coupling member Thus, the minute displacement in the vehicle width direction of the bumper reinforcement is further effectively suppressed.

  Moreover, at the time of a vehicle collision, the positional relationship between the energy absorbing member attached to the bumper reinforcement and the coupling member can be maintained by the reinforcing member. As a result, the deformed shape of the coupling member can be stabilized, so that the energy absorbing member is further prevented from falling down.

  The present invention according to claim 1 can effectively suppress a minute displacement of the bumper reinforcement in the vehicle width direction.

  According to the second aspect of the present invention, the energy absorbing member can be compressed and deformed in the vehicle front-rear direction in the event of a vehicle collision.

  According to the third aspect of the present invention, it is possible to prevent the energy absorbing member from falling sideways during a vehicle collision.

  The present invention according to claim 4 can further suppress the minute displacement of the bumper reinforcement in the vehicle width direction or the lateral collapse of the energy absorbing member.

  A vehicle bumper support structure according to a first embodiment of the present invention will be described with reference to FIGS.

  In the figure, the arrow UP indicates the vehicle upward direction, the arrow FR in the figure indicates the vehicle forward direction, and the arrow IN in the figure indicates the vehicle width inside direction.

  FIG. 3 is a plan view of the vehicle bumper support structure according to the first embodiment of the present invention as viewed from above the vehicle.

  In FIG. 3, a part of the structure is shown in cross section for clarity.

  As shown in FIG. 3, a pair of left and right rear side members 12 are arranged along the longitudinal direction of the vehicle at the rear part of the vehicle body 10 of the present embodiment. The pair of left and right rear side members 12 constitute part of the skeleton of the automobile body 10.

  The rear ends 12A of the pair of left and right rear side members 12 are coupled to the front ends of a crash box 18 as an energy absorbing member, with both end portions 14A in the vehicle width direction of the lower bag panel 14 interposed therebetween. The rear end of the crash box 18 is coupled to both end portions 22A in the vehicle width direction of the bumper reinforcement 22 of the rear bumper 20, and the crash box 18 is compressed and deformed in the vehicle front-rear direction (longitudinal direction) at the time of a vehicle collision. It is designed to absorb collision energy.

  The bumper reinforcement 22 of the rear bumper 20 is covered with a bumper cover 24.

  2 is an enlarged cross-sectional view taken along the line 2-2 in FIG. 3, and FIG. 1 is a cross-sectional view taken along the line 1-1 in FIG.

  As shown in FIG. 1, the crash box 18 is arranged with its longitudinal direction along the vehicle front-rear direction, and the vehicle width direction both ends 14 </ b> A of the lower bag panel 14 at the mounting portion 26 on the vehicle body side provided at the front end 18 </ b> A. It is coupled to the rear surface 14B by fastening means (not shown) such as bolts. Further, the vehicle width direction inner side portion 26A of the mounting portion 26 of the crash box 18 extends inward in the vehicle width direction along the rear surface 14B of the lower bag panel 14, and the vehicle width direction outer side portion 26B is the rear surface of the lower bag panel 14. 14B is extended outward in the vehicle width direction.

  As shown in FIG. 2, the mounting portion 26 of the crash box 18 is made of a plate material having a U-shaped cross section, and flanges 26 </ b> C are respectively provided at the upper and lower ends of the mounting portion 26 of the crash box 18 on the vehicle rear side. It is formed towards.

  The cross-sectional shape of the bumper reinforcement 22 of the rear bumper 20 viewed from the vehicle width direction is a U-shape with the opening facing the front of the vehicle. A flange 22C is formed toward the front.

  Further, a reinforcing bracket 30 as a reinforcing member is coupled to the front surface 22D of the vertical wall portion 22B of the bumper reinforcement 22 by fastening means (not shown) such as a bolt. The cross-sectional shape of the reinforcing bracket 30 viewed from the vehicle width direction is a U-shape with the opening facing the front of the vehicle, and the vertical wall portion 30A has flanges 30B toward the vehicle front at both ends in the vehicle vertical direction. Is formed.

  As shown in FIG. 1, the reinforcing bracket 30 is arranged in the longitudinal direction along the vehicle width direction. Further, the rear end 18B of the crash box 18 is coupled to the front surface of the vertical wall portion 30A of the reinforcing bracket 30 by welding or the like.

  On the inner side in the vehicle width direction of the crash box 18, a stay 40 having a long plate shape as a coupling member is provided. A front mounting portion 40A is formed at the front end of the stay 40 toward the outer side in the vehicle width direction. The front mounting portion 40A is a vehicle of the mounting portion 26 that serves as a coupling portion between the crash box 18 and the lower bag panel 14 on the vehicle body side. It is joined to the inner part 26A in the width direction by welding or the like.

  In addition, the coupling | bond part of the crash box 18 and the lower bag panel 14 by the side of a vehicle body is a site | part which becomes a structure which maintains a coupling force or reinforces a coupling force.

  On the other hand, a rear side mounting portion 40B is formed at the rear end of the stay 40 toward the inner side in the vehicle width direction, and the rear side mounting portion 40B is bolted to the inner side portion 30C in the vehicle width direction of the vertical wall portion 30A of the reinforcing bracket 30. Are connected by fastening means 44 such as.

  The rear attachment portion 40B of the stay 40 is separated from the rear end 18B of the crash box 18 by a distance W1 in the vehicle width direction. That is, the stay 40 is coupled to a position separated from the crash box 18 attached to the bumper reinforcement 22 by a distance W1 in the vehicle width direction.

  Therefore, when the bumper reinforcement 22 is about to be slightly displaced in the vehicle width direction (the direction of arrow C in FIG. 1) while the vehicle is running, the vehicle is moved from the rear end 18B of the crash box 18 attached to the bumper reinforcement 22. A minute displacement in the vehicle width direction of the bumper reinforcement 22 is effectively suppressed by the stay 40 that couples the position spaced inward in the width direction and the coupling portion between the crash box 18 and the lower bag panel 14. It has become.

  In addition, since the crash box 18 attached to the bumper reinforcement 22 and the stay 40 are connected by the reinforcing bracket 30, when the bumper reinforcement 22 is about to be slightly displaced in the vehicle width direction, the reinforcing bracket 30 is used. And the stay 40 further suppresses the minute displacement in the vehicle width direction of the bumper reinforcement 22 more effectively.

  A bent portion 48 as a fragile portion is formed in the middle portion of the stay 40 in the longitudinal direction, and the bent portion 48 reduces the drag force of the stay 40 against the compressive force in the vehicle front-rear direction. Between the bent portion 48 of the stay 40 and the front mounting portion 40A is an inclined portion 40C extending from the rear in the vehicle width direction toward the front in the vehicle width direction, and between the bent portion 48 and the rear mounting portion 40B. Is a longitudinal extension 40D extending in the longitudinal direction of the vehicle.

  Further, the length L1 from the bent portion 48 of the stay 40 to the front mounting portion 40A is a distance L2 along the vehicle width direction from the bent portion 48 to the front mounting portion 40A and from the bent portion 48 to the rear mounting portion 40B. (L1 = L2 + L3) or almost the sum (L1≈L2 + L3) with the distance L3 along the vehicle longitudinal direction.

  Accordingly, as shown by a two-dot chain line in FIG. 1, the collision K of the other vehicle or the like collides with the rear bumper 20 from behind the vehicle, and the bumper reinforcement 22 is caused by the collision load (arrow F1 in FIG. 1) acting from the collision body K. When the stay 40 is deformed by moving toward the vehicle body side (in the direction of arrow A in FIG. 1) and the stay 40 is deformed, the stay 40 is bent into a character shape with the bent portion 48 as a starting point.

  At this time, the length L1 from the bent portion 48 to the front side mounting portion 40A that becomes the connecting portion between the crash box 18 and the lower bag panel 14 is the distance L2 along the vehicle width direction from the bent portion 48 to the front side mounting portion 40A. 1 and the distance L3 along the vehicle front-rear direction from the bent portion 48 to the rear mounting portion 40B that is the connecting portion with the bumper reinforcement 22, the two-dot chain line arrow in FIG. As indicated by B, the rear mounting portion 40B of the stay 40 does not move in the vehicle width direction, but moves forward of the vehicle. As a result, the crash box 18 is compressed and deformed in the vehicle longitudinal direction without falling down.

  Further, by connecting the crash box 18 attached to the bumper reinforcement 22 and the stay 40 with the reinforcement bracket 30, the crash box 18 and stay 40 attached to the bumper reinforcement 22 with the reinforcement bracket 30 at the time of a vehicle collision. The positional relationship (distance W1) can be maintained. For this reason, the square-shaped deformation of the stay 40 can be stabilized, and the crash of the crash box 18 can be further suppressed.

  Next, the operation of this embodiment will be described.

  In the present embodiment, crash boxes 18 that are deformed at the time of a vehicle collision are provided at both ends 22A in the vehicle width direction of the bumper reinforcement 22 that is disposed along the vehicle width direction at the rear end lower portion of the vehicle body 10. The crash box 18 connects the bumper reinforcement 22 and the lower bag panel 14 (vehicle body). A front mounting portion 40A of a long plate-shaped stay 40 provided on the inner side in the vehicle width direction of the crash box 18 is a vehicle of the mounting portion 26 that serves as a coupling portion between the crash box 18 and the lower bag panel 14 on the vehicle body side. The rear mounting portion 40B of the stay 40 is connected to the inner side portion 26A of the width direction by welding or the like, and is separated from the crash box 18 attached to the bumper reinforcement 22 via the reinforcing bracket 30 by a distance W1 toward the inner side of the vehicle width. Bound to position.

  Therefore, when the bumper reinforcement 22 is about to be slightly displaced in the vehicle width direction (the direction of arrow C in FIG. 1) while the vehicle is running, the rear end 18B of the crash box 18 attached to the bumper reinforcement 22 By the stay 40 that connects the position separated from the connecting portion by the distance W1 inward in the vehicle width direction and the connecting portion between the crash box 18 and the lower bag panel 14, a small displacement of the bumper reinforcement 22 in the vehicle width direction is effective. Is suppressed.

  Furthermore, in this embodiment, the crash box 18 attached to the bumper reinforcement 22 and the stay 40 are connected by the reinforcing bracket 30. For this reason, when the bumper reinforcement 22 tries to be slightly displaced in the vehicle width direction, the minute displacement in the vehicle width direction of the bumper reinforcement 22 is further effectively suppressed by the reinforcing bracket 30 and the stay 40. .

  As a result, since the support rigidity of the bumper reinforcement 22 is improved, the steering stability and the vehicle motion performance are improved.

  Further, in the present embodiment, as indicated by a two-dot chain line in FIG. 1, a collision K of another vehicle or the like collides with the rear bumper 20 from an oblique rear side of the vehicle, and a collision load (arrow F1 in FIG. 1) acts from the collision body K. When the bumper reinforcement 22 moves to the vehicle front side (in the direction of arrow A in FIG. 1) on the vehicle body side and the stay 40 is deformed, the stay 40 bends in a letter shape starting from the bent portion 48. For this reason, the crash box 18 is compressed and deformed in the vehicle front-rear direction.

  At this time, the length L1 from the bent portion 48 to the front side mounting portion 40A that becomes the connecting portion between the crash box 18 and the lower bag panel 14 is the distance L2 along the vehicle width direction from the bent portion 48 to the front side mounting portion 40A. And the distance L3 along the vehicle front-rear direction from the bent portion 48 to the rear-side mounting portion 40B that is the connecting portion with the bumper reinforcement 22. For this reason, as shown by a two-dot chain line arrow B in FIG. 1, the rear mounting portion 40B of the stay 40 does not move in the vehicle width direction but moves forward of the vehicle. As a result, the crash box 18 is compressed and deformed without falling down.

  Further, in the present embodiment, the crash box 18 attached to the bumper reinforcement 22 and the stay 40 are connected by the reinforcing bracket 30. For this reason, at the time of a vehicle collision, the positional relationship (distance W1) between the crash box 18 attached to the bumper reinforcement 22 and the stay 40 can be maintained by the reinforcing bracket 30. As a result, the square-shaped deformation of the stay 40 can be stabilized, and the lateral fall of the crash box 18 can be further suppressed.

  Therefore, in the present embodiment, the crash box 18 can be prevented from falling down in the event of a vehicle collision. For this reason, it is possible to suppress deformation of the lower bag panel 14 that may occur due to the crash of the crash box 18.

  Next, a second embodiment of the vehicle bumper support structure according to the present invention will be briefly described with reference to FIG.

  FIG. 4 shows a cross-sectional view corresponding to FIG. 1 of the vehicle bumper support structure according to the second embodiment of the present invention.

  In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 4, in the present embodiment, a stay 40 having a long plate shape as a coupling member is provided outside the crash box 18 in the vehicle width direction.

  Therefore, also in this embodiment, the same effect as the first embodiment can be obtained.

  Next, a third embodiment of the vehicle bumper support structure according to the present invention will be described with reference to FIG.

  FIG. 5 is a cross-sectional view corresponding to FIG. 1 of the vehicle bumper support structure according to the third embodiment of the present invention.

  In addition, about the same member as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 5, in the present embodiment, a stay 60 having a long plate shape as a coupling member is provided inside the crash box 18 in the vehicle width direction. It is arranged linearly toward the front outside in the vehicle width direction.

  The front end portion of the stay 60 is a front side mounting portion 60A, and the front side mounting portion 60A is welded to a vehicle width direction inner side portion 26A of the mounting portion 26 that is a connecting portion between the crash box 18 and the lower bag panel 14 on the vehicle body side. Are bound by. On the other hand, a rear mounting portion 60B is formed at the rear end of the stay 60 toward the inner side in the vehicle width direction, and the rear mounting portion 60B is bolted to the vehicle width direction inner side portion 30C of the vertical wall portion 30A of the reinforcing bracket 30. Are connected by fastening means 44 such as. The rear mounting portion 60B of the stay 60 is separated from the rear end 18B of the crash box 18 by a distance W1 in the vehicle width direction. That is, the stay 60 is coupled to the crash box 18 attached to the bumper reinforcement 22 at a position separated by a distance W1 in the vehicle width direction.

  In addition, a notch (notch) 64 as a fragile portion is formed in a trapezoidal shape in plan view from the outside in the vehicle width direction at the intermediate portion in the longitudinal direction of the stay 60.

  Further, the stay 60 has a length L1 from the notch 64 to the front mounting portion 60A, a distance L2 along the vehicle width direction from the notch 64 to the front mounting portion 60A, and a vehicle front-rear direction from the notch 64 to the rear mounting portion 60B. It is the sum of the distance L3 along the direction.

  For this reason, as shown by a two-dot chain line in FIG. 5, a bumper reinforcement is caused by a collision load (arrow F <b> 1 in FIG. 5) where a collision K of another vehicle or the like collides with the rear bumper 20 obliquely from behind the vehicle. When the stay 22 is deformed by moving toward the vehicle body side 22 (in the direction of arrow A in FIG. 5) and the stay 60 is deformed, the stay 60 is bent into a character shape with the notch 64 as a starting point. For this reason, the crash box 18 is compressed and deformed in the vehicle front-rear direction.

  At this time, the length L1 from the notch 64 to the front side mounting portion 60A that becomes the coupling portion between the crash box 18 and the lower bag panel 14 is a distance L2 along the vehicle width direction from the notch 64 to the front side mounting portion 60A. This is the sum of the distance L3 along the vehicle front-rear direction from the notch 64 to the rear mounting portion 60B which is a connecting portion with the bumper reinforcement 22. Therefore, as indicated by a two-dot chain line arrow B in FIG. 5, the rear mounting portion 60B of the stay 60 does not move in the vehicle width direction, but moves in the front of the vehicle. As a result, the crash box 18 is compressed and deformed without falling down.

  Therefore, also in this embodiment, the same effect as the first embodiment can be obtained.

  In the above, the present invention has been described in detail for specific embodiments. However, the present invention is not limited to the above-described embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art. For example, in each of the above-described embodiments, the coupling member is the stay 40 or the stay 60 having a long plate shape, but the coupling member is not limited to the stay having a long plate shape, and the energy absorbing member and the vehicle body Any other configuration may be used as long as it is a coupling member that couples the coupling portion and a position separated in the vehicle width direction from the energy absorbing member attached to the bumper reinforcement.

  In each of the above embodiments, the reinforcing member is a U-shaped reinforcing bracket 30. However, the reinforcing member is not limited to the U-shaped reinforcing bracket 30, and is coupled to an energy absorbing member attached to a bumper reinforcement. Other configurations such as a plate material may be used as long as they are reinforcing members that connect the members.

  In the first and second embodiments, the fragile portion of the coupling member is the bent portion 48, and in the third embodiment, the fragile portion of the coupling member is the notch 64, but the fragile portion of the coupling member is the bent portion 48 or the notch 64. However, other weak parts such as a narrow part may be used as long as the resistance is reduced against the compressive force in the vehicle longitudinal direction.

  In each of the above embodiments, the vehicle bumper support structure of the present invention is applied to a rear bumper. However, the vehicle bumper support structure of the present invention can also be applied to a front bumper or the like.

FIG. 3 is a cross-sectional view taken along a line 1-1 in FIG. 2. FIG. 4 is an enlarged cross-sectional view taken along line 2-2 in FIG. 3. It is the top view seen from the vehicles upper part which shows the bumper support structure of the vehicles concerning a 1st embodiment of the present invention. It is sectional drawing corresponding to FIG. 1 which shows the bumper support structure of the vehicle which concerns on 2nd Embodiment of this invention. It is sectional drawing corresponding to FIG. 1 which shows the bumper support structure of the vehicle which concerns on 3rd Embodiment of this invention.

Explanation of symbols

10 Car Body 12 Rear Side Member 14 Lower Bag Panel (Car Body)
18 Crash box (energy absorbing member)
22 Bumper reinforcement 30 Reinforcement bracket (reinforcement member)
40 stay (joint member)
48 Stay flexion (fragile)
60 stay (joint member)
64 Stay notch (fragile part)

Claims (4)

Bumper reinforcement arranged in the vehicle width direction in the longitudinal direction at the lower part of the longitudinal direction end of the vehicle,
An energy absorbing member that supports the bumper reinforcement on the vehicle body at a plurality of locations separated in the vehicle width direction, and deforms in the vehicle front-rear direction in the event of a vehicle collision;
A coupling member that couples a coupling portion between the energy absorbing member and the vehicle body, and a position spaced in the vehicle width direction from the energy absorbing member attached to the bumper reinforcement;
A bumper support structure for a vehicle, comprising:   2. The vehicle bumper support structure according to claim 1, wherein the coupling member has an elongated shape, and has a weakened portion that lowers a drag force against a compressive force in the longitudinal direction of the vehicle at an intermediate portion in the longitudinal direction.   The coupling member has a length from the fragile portion to the coupling portion between the energy absorbing member and the vehicle body, a distance along the vehicle width direction from the fragile portion to the coupling portion between the energy absorbing member and the vehicle body, The vehicle bumper support structure according to claim 2, wherein the vehicle bumper support structure is a sum of a distance along a vehicle front-rear direction from the fragile portion to a joint portion with the bumper reinforcement.   The vehicle bumper support structure according to any one of claims 1 to 3, further comprising a reinforcing member that connects the energy absorbing member and the coupling member attached to the bumper reinforcement.

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