JP2007045319A - Vehicle floor structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide vehicle floor structure wherein a primary resonance frequency of a floor panel can be set within a target range. <P>SOLUTION: In the vehicle floor structure 10, a bead 16 is provided with a first bead part 20 on a vehicle front side over a longitudinal intermediate part 18, and a second bead part 22 formed wider than the first bead part 20 on a vehicle rear side over the longitudinal intermediate part 18. Therefore, when the longitudinal intermediate part 18 of the bead 16 serving as a rigidity varying point of a rear floor panel 14 is set in an arbitrary position in the longitudinal direction of the bead 16 at the time of design of the rear floor panel 14, a panel region of the second bead part 22 is increased or decreased, thereby increasing or decreasing the rigidity of the whole rear floor panel 14 including the bead 16. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicle floor structure, and more particularly to a vehicle floor structure in which a bead of a ridge protruding from a panel surface is formed on a floor panel.

  Examples of this type of vehicle floor structure include the following (see, for example, Non-Patent Documents 1 and 2 or Patent Documents 1 to 3).

  For example, in the example described in Non-Patent Document 1, a plurality of convex bead portions are provided on the lower surface of the rear floor pan along the vehicle front-rear direction. This bead portion is provided to ensure the rigidity of the rear floor pan and to control the flow of paint during the electrodeposition coating of the rear floor pan. Reinforcement reinforcement is provided in each bead portion, thereby preventing a reduction in the plate thickness of the rear floor pan without causing a reduction in rigidity of the rear floor pan and reducing the overall weight.

  Further, in the example described in Non-Patent Document 2, stripe-shaped beads are provided in the region where deformation is concentrated on the rear floor. The bead is formed so as to connect the center floor cross member and the rear floor cross member. Thereby, since a bead is arrange | positioned along the direction orthogonal to the direction of the deformation wrinkle which generate | occur | produces in a vehicle width direction, the distortion of the floor surface by a deformation | transformation is suppressed.

Patent Document 1 discloses an example in which a plurality of beads for increasing the rigidity of the floor surface are provided on the floor panel in the front part of the vehicle. Patent Documents 2 and 3 disclose the floor panel in the front part of the vehicle. An example is disclosed in which a plurality of beads are provided between cross members of a floor panel in order to increase rigidity.
Toyota Technical Disclosure Collection 13594 (issued May 31, 2002) Toyota Technical Disclosure Collection 15616 (issued April 28, 2004) JP 2000-335446 A JP-A-60-69775 Japanese Utility Model Publication No. 4-104779

  However, since a vehicle floor panel generally has a large vibration area and is likely to generate sound, it resonates when the vehicle is running or when the engine is running. Therefore, in order to reduce noise due to resonance of the floor panel, it is necessary to keep the resonance frequency of the floor panel within the target range.

  However, in a vehicle floor structure in which a bead is provided on the floor panel, the resonance frequency of the floor panel falls within the target range if the bead is simply provided on the floor panel in order to ensure the rigidity of the floor panel as in the above-described prior art. It is difficult.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a vehicle floor structure capable of keeping the resonance frequency of the floor panel within a target range while ensuring the rigidity of the floor panel. It is in.

  In order to solve the above-mentioned problem, the vehicle floor structure according to claim 1 is a vehicle floor structure in which a bead of a ridge protruding from a panel surface is formed on a floor panel, and the bead sandwiches a middle portion in the longitudinal direction. On the other hand, a first bead portion is provided on one side and a second bead portion formed wider than the first bead portion is provided on the other side across the longitudinal intermediate portion.

  As described above, in the vehicle floor structure according to the first aspect, the bead of the ridge protruding from the panel surface is formed on the floor panel. According to this configuration, since the bead of the ridge supports the panel surface of the floor panel, the rigidity of the entire floor panel can be secured by this bead.

  In the vehicle floor structure according to claim 1, the bead includes a first bead portion on one side sandwiching the longitudinal intermediate portion and is wider than the first bead portion on the other side sandwiching the longitudinal intermediate portion. The second bead portion is formed.

  According to this configuration, the intermediate portion in the longitudinal direction, which is the boundary between the first bead portion and the second bead portion formed in the bead, becomes the rigidity change point of the floor panel. For this reason, when the bead and the floor panel vibrate together at the time of resonance, an intermediate portion in the longitudinal direction of the bead becomes an antinode of vibration at the time of resonance of the floor panel (an opportunity for folding at the time of resonance).

  At this time, when the longitudinal intermediate portion of the bead, which becomes the rigidity change point of the floor panel, moves in the longitudinal direction of the bead, it is formed wider than the first bead portion. The panel area occupied increases or decreases. And if the panel area which a 2nd bead part occupies increases / decreases, the rigidity of the whole floor panel including a bead will increase / decrease, and, thereby, the resonant frequency of a floor panel will change.

  Therefore, when designing the floor panel, the resonance frequency of the floor panel can be kept within the target range by setting the middle part of the bead in the longitudinal direction of the bead, which becomes the rigidity change point of the floor panel, to an arbitrary position in the longitudinal direction of the bead. It becomes.

  Thus, according to the vehicle floor structure of the first aspect, while securing the rigidity of the floor panel by the bead, the longitudinal intermediate portion of the bead that becomes the rigidity change point of the floor panel is arbitrarily set in the longitudinal direction of the bead. By setting the position and adjusting the rigidity of the entire floor panel including the bead, it is possible to keep the resonance frequency of the floor panel with a large vibration area and easy sound generation within the target range (controlling the resonance frequency freely) It becomes.

  The vehicle floor structure according to claim 2 is characterized in that, in the vehicle floor structure according to claim 1, the second bead portion gradually becomes wider from the middle portion in the longitudinal direction toward the end portion in the longitudinal direction. And

  As described above, when the second bead portion is gradually widened so that both end surfaces in the width direction extend linearly outward in the width direction as it goes from the middle portion in the longitudinal direction to the end portion in the longitudinal direction, the first bead formed in the bead The rigidity of the floor panel gradually increases at a constant rate from the bead portion to the second bead portion.

  As a result, the rigidity of the floor panel can be prevented from abruptly changing at the intermediate portion in the longitudinal direction, which is the boundary between the first bead portion and the second bead portion formed on the bead. Even when a load is applied in parallel with the panel surface, local deformation of the floor panel at a portion where the longitudinal intermediate portion of the bead is located can be suppressed.

  The vehicle floor structure according to claim 3 is the vehicle floor structure according to claim 1 or 2, wherein the first bead portion is configured by a plurality of parallel bead portions arranged in parallel in the bead width direction. It is characterized by.

  As described above, when the first bead portion is constituted by a plurality of side-by-side bead portions arranged in the bead width direction, the plurality of the side-by-side bead portions support the panel surface of the floor panel. Thereby, the rigidity of the panel area | region formed in the circumference | surroundings of the 1st bead part can be improved.

  In order to solve the above-mentioned problem, the vehicle floor structure according to claim 4 is a vehicle floor structure in which a bead of a ridge protruding from a panel surface is formed on a floor panel. A first bead portion extending along the vehicle width direction, and a second bead extending in a direction crossing the first bead portion and having a longitudinal intermediate portion coupled to a longitudinal end portion of the first bead portion. And a bead portion.

  As described above, in the vehicle floor structure according to the fourth aspect, the bead of the ridge protruding from the panel surface is formed on the floor panel. According to this configuration, since the bead of the ridge supports the panel surface of the floor panel, the rigidity of the entire floor panel can be secured by this bead.

  In the vehicle floor structure according to claim 4, the bead extends in one direction and extends in a direction intersecting the first bead portion, and the longitudinal intermediate portion is the first. A second bead portion coupled to a longitudinal end portion of the bead portion.

  According to this structure, the coupling | bond part of the 1st bead part formed in the bead and the 2nd bead part becomes a rigidity change point of a floor panel. For this reason, when the bead and the floor panel vibrate together at the time of resonance, this coupling portion becomes an antinode of vibration at the time of resonance of the floor panel (an opportunity for folding at the time of resonance).

  At this time, when the connecting portion between the first bead portion and the second bead portion that becomes the rigidity change point of the floor panel moves in the longitudinal direction of the first bead portion, the first bead portion is orthogonal to the first bead portion. By doing so, the panel area | region which a highly rigid 2nd bead part occupies in the extending direction of a 1st bead part increases / decreases. And if the panel area which a 2nd bead part occupies increases / decreases, the rigidity of the whole floor panel including a bead will increase / decrease, and, thereby, the resonant frequency of a floor panel will change.

  Accordingly, when designing the floor panel, if the connecting portion of the first bead portion and the second bead portion, which becomes the rigidity change point of the floor panel, is set at an arbitrary position in the longitudinal direction of the first bead portion, the resonance of the floor panel is achieved. It becomes possible to keep the frequency within the target range.

  As described above, according to the vehicle floor structure of the fourth aspect, the connecting portion between the first bead portion and the second bead portion, which becomes the rigidity change point of the floor panel, is secured while the rigidity of the floor panel is secured by the bead. By adjusting the rigidity of the entire floor panel including the bead by setting it at an arbitrary position in the longitudinal direction of the bead, the resonance frequency of the floor panel that has a large vibration area and is easy to sound is kept within the target range (the resonance frequency can be freely set). Can be controlled).

  The vehicle floor structure according to claim 5 is the vehicle floor structure according to any one of claims 1 to 4, wherein the first bead portion is arranged in a vehicle front-rear direction or a vehicle at a center position of the floor panel. It is characterized by extending along the width direction.

  As described above, when the first bead portion is extended at the center position of the floor panel along the vehicle front-rear direction or the vehicle width direction, the center position having the lowest rigidity of the floor panel is reinforced by the first bead portion. be able to. Thereby, the rigidity of the center position of a floor panel can be improved efficiently.

  The vehicle floor structure according to claim 6 is the vehicle floor structure according to any one of claims 1 to 5, wherein the second bead portion is formed in a position near an end of the floor panel. It is characterized by being.

  Thus, when the second bead portion is formed in the vicinity of the end portion of the floor panel, the second bead portion is close to another panel connected to the end portion of the floor panel. The rigidity of the can be increased efficiently. Thereby, even if it does not enlarge a 2nd bead part more than necessary, the rigidity difference with a 1st bead part is securable.

  The vehicle floor structure according to claim 7 is the vehicle floor structure according to any one of claims 1 to 6, wherein a boundary between the first bead part and the second bead part is the floor panel. It is provided on the vehicle rear side.

  Thus, when the boundary between the first bead part and the second bead part is provided on the vehicle rear side of the floor panel, the floor when a load is applied in parallel to the panel surface to the floor panel due to a collision or the like. The deformation of the panel can be concentrated on the vehicle rear side of the floor panel where the boundary between the first bead part and the second bead part (that is, the rigidity change point of the floor panel) is located.

  Thereby, even when a load is applied in parallel to the panel surface with respect to the floor panel due to a collision or the like, deformation of the floor panel on the front side of the vehicle can be suppressed. Etc. can be protected.

  The vehicle floor structure according to claim 8 is the vehicle floor structure according to any one of claims 1 to 6, wherein a boundary between the first bead portion and the second bead portion is the floor panel. It is provided in the vehicle front side, It is characterized by the above-mentioned.

  Thus, when the boundary between the first bead part and the second bead part is provided on the vehicle front side of the floor panel, the floor when a load is applied in parallel to the panel surface to the floor panel due to a collision or the like. The deformation of the panel can be concentrated on the vehicle front side of the floor panel where the boundary between the first bead part and the second bead part (that is, the rigidity change point of the floor panel) is located.

  Thereby, even when a load is applied in parallel to the panel surface with respect to the floor panel due to a collision or the like, deformation of the floor panel on the vehicle rear side can be suppressed, so the member disposed on the vehicle rear side of the floor panel Etc. can be protected.

  The vehicle floor structure according to claim 9 is the vehicle floor structure according to any one of claims 1 to 8, wherein the first bead portion of the floor panel is disposed on both sides of the first bead portion. An auxiliary bead of a ridge extending along the direction intersecting the bead portion and protruding from the panel surface is formed.

  As described above, when the auxiliary beads of the ridges extending along the direction intersecting the first bead portion and projecting from the panel surface are formed on both sides of the first bead portion of the floor panel, this auxiliary The rigidity of the panel regions on both sides of the first bead portion can be made uniform by the bead (the rigidity can be stabilized).

  As a result, the boundary between the plurality of first bead portions and the second bead portion can be reliably set as a rigidity change point in the floor panel, so that the design for keeping the resonance frequency of the floor panel within the target range is easier. (Resonance frequency control becomes easier).

  As described above in detail, according to the present invention, it is possible to keep the resonance frequency of the floor panel within the target range while ensuring the rigidity of the floor panel.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. It should be noted that members, arrangements, and the like described below do not limit the present invention, and it goes without saying that various modifications can be made in accordance with the spirit of the present invention.

[First embodiment]
First, the configuration of the vehicle floor structure 10 according to the first embodiment of the present invention will be described with reference to FIG.

  The vehicle floor structure 10 according to the first embodiment of the present invention is suitably applied to a vehicle 12 such as a passenger car, for example. In this embodiment, the vehicle floor structure 10 is applied to the rear part of the vehicle 12 as an example.

  In the vehicle floor structure 10 according to the present embodiment, a single protruding bead 16 is formed on the rear floor panel 14 provided at the rear portion of the vehicle 12 so as to protrude upward from the panel surface. The bead 16 is formed integrally with the rear floor panel 14 when the rear floor panel 14 is press-molded. When the rear floor panel 14 is viewed from the lower side of the vehicle, the bead 16 has a concave shape.

  And in the bead 16, the width | variety is changed by making the longitudinal direction intermediate part 18 into a boundary. In this embodiment, the vehicle front side across the longitudinal intermediate portion 18 of the bead 16 is the narrow first bead portion 20, and the vehicle rear side across the longitudinal intermediate portion 18 of the bead 16 is the first bead portion. The second bead portion 22 is wider than 20.

  The first bead portion 20 mainly reinforces the center position having the lowest rigidity of the rear floor panel 14, and extends from the front end portion 14A at the center position of the rear floor panel 14 to the vehicle rear side along the vehicle front-rear direction. Yes. The second bead portion 22 is formed in the vicinity of the rear end portion 14B of the rear floor panel 14, and the vehicle rear side of the second bead portion 22 is connected to the rear end portion 14B of the rear floor panel 14.

  The first bead portion 20 is formed with a pair of ridge lines 20A and 20B extending in the vehicle front-rear direction. On the other hand, the second bead portion 22 is connected to the first ridge lines 22A and 22B and the first ridge lines 22A and 22B connected to the pair of ridge lines 20A and 20B formed in the first bead portion 20 and extending in the vehicle width direction. Thus, second ridge lines 22C and 22D extending in the vehicle front-rear direction are formed.

  With this configuration, in the present embodiment, the second bead is configured so that the longitudinal intermediate portion 18, which is the boundary between the first bead portion 20 and the second bead portion 22 formed in the bead 16, becomes a rigidity change point in the rear floor panel 14. The portion 22 is wider than the first bead portion 20 at a predetermined rate.

  In the present embodiment, the longitudinal intermediate portion 18 that is the boundary between the first bead portion 20 and the second bead portion 22 is provided on the vehicle rear side with respect to the center portion of the rear floor panel 14. Thereby, the rigidity change point of the rear floor panel 14 formed by the longitudinal direction intermediate portion 18 of the bead 16 is set on the vehicle rear side with respect to the center portion of the rear floor panel 14.

  Further, on both sides of the rear floor panel 14 with the first bead portion 20 sandwiched therebetween, auxiliary ridges extending along the direction orthogonal to the first bead portion 20 (vehicle width direction) and projecting upward from the panel surface to the vehicle. A plurality of beads 24 (three on each side) are formed. The auxiliary bead 24 is also formed integrally with the rear floor panel 14 when the rear floor panel 14 is press-molded, and is concave when the rear floor panel 14 is viewed from the vehicle lower side.

  Next, the operation of the vehicle floor structure 10 according to the first embodiment of the present invention will be described.

  In the vehicle floor structure 10 according to the first embodiment of the present invention, a protruding bead 16 protruding from the panel surface is formed on the rear floor panel 14. According to this configuration, since the bead 16 of the ridge supports the panel surface of the rear floor panel 14, the rigidity of the entire rear floor panel 14 can be secured by the bead 16.

  Further, in the vehicle floor structure 10 according to the first embodiment of the present invention, the bead 16 includes the first bead portion 20 on the vehicle front side with the longitudinal intermediate portion 18 sandwiched therebetween and the vehicle with the longitudinal intermediate portion 18 sandwiched therebetween. A second bead portion 22 formed wider than the first bead portion 20 is provided on the rear side.

  According to this configuration, the longitudinal intermediate portion 18 that is the boundary between the first bead portion 20 and the second bead portion 22 formed in the bead 16 becomes the rigidity change point of the rear floor panel 14. For this reason, when the bead 16 and the rear floor panel 14 vibrate together at the time of primary resonance, for example, the intermediate portion 18 in the longitudinal direction of the bead 16 is a vibration antinode at the time of the primary resonance of the rear floor panel 14 )

  At this time, when the longitudinal direction intermediate portion 18 of the bead 16 serving as the rigidity change point of the rear floor panel 14 moves in the longitudinal direction of the bead 16 (vehicle longitudinal direction), the bead 16 is formed wider than the first bead portion 20. As a result, the panel area occupied by the rigid second bead portion 22 increases or decreases. When the panel area occupied by the second bead portion 22 increases or decreases, the rigidity of the entire rear floor panel 14 including the beads 16 increases or decreases, and thereby the primary resonance frequency f1 (see FIG. 2) of the rear floor panel 14 changes.

  Accordingly, when the rear floor panel 14 is designed, if the longitudinal direction intermediate portion 18 of the bead 16 that becomes the rigidity change point of the rear floor panel 14 is set at an arbitrary position in the longitudinal direction of the bead 16, for example, as shown in FIG. The primary resonance frequency f1 of the rear floor panel 14 can be kept within the target range Rt (for example, 65 Hz to 85 Hz).

  As described above, according to the vehicle floor structure 10 according to the first embodiment of the present invention, the rigidity of the rear floor panel 14 is secured by the bead 16, and the intermediate portion in the longitudinal direction of the bead 16 serving as the rigidity change point of the rear floor panel 14 is achieved. By setting 18 to an arbitrary position in the longitudinal direction of the bead 16 and adjusting the rigidity of the entire rear floor panel 14 including the bead 16, the primary resonance frequency f1 of the rear floor panel 14 that has a large vibration area and is easy to produce sound is set in the target range. It can be accommodated in Rt (the primary resonance frequency f1 can be freely controlled).

  The acoustic sensitivity can be kept low by keeping the primary resonance frequency f1 of the rear floor panel 14 that has a large vibration area and is easy to sound within the target range Rt in this way. It is possible to reduce noise due to primary resonance.

  Moreover, in the vehicle floor structure 10 which concerns on 1st embodiment of this invention, the 1st bead part 20 is extended in the center position of the rear floor panel 14 along the vehicle front-back direction. Accordingly, the center position of the rear floor panel 14 having the lowest rigidity can be reinforced by the first bead portion 20. Thereby, the rigidity of the center position of the rear floor panel 14 can be improved efficiently.

  Further, the first bead portion 20 of the rear floor panel 14 is secured to the center position of the rear floor panel 14 by extending the first bead portion 20 in the center position of the rear floor panel 14 along the vehicle front-rear direction. Panel regions on both sides of the part 20 can be used for component placement. Accordingly, the degree of freedom of component placement on the rear floor panel 14 is also increased.

  In the vehicle floor structure 10 according to the first embodiment of the present invention, the second bead portion 22 is formed in the vicinity of the rear end portion 14B of the rear floor panel 14. Accordingly, since the second bead portion 22 is close to the floor rear wall 26 connected to the rear end portion 14B of the rear floor panel 14, the rigidity of the second bead portion 22 can be efficiently increased. Thereby, even if it does not enlarge the 2nd bead part 22 more than necessary, the rigidity difference with the 1st bead part 20 is securable.

  In the vehicle floor structure 10 according to the first embodiment of the present invention, the boundary between the first bead portion 20 and the second bead portion 22 is provided on the vehicle rear side of the rear floor panel 14. Therefore, the deformation of the rear floor panel 14 when a load is applied to the rear floor panel 14 parallel to the panel surface due to a rear impact or the like is caused by the boundary between the first bead portion 20 and the second bead portion 22 (that is, the rigidity of the rear floor panel 14). It is possible to concentrate on the vehicle rear side of the rear floor panel 14 where the longitudinal direction intermediate portion 18 which is a change point) is located.

  For this reason, even when a load is applied in parallel to the panel surface from the vehicle rear side to the rear floor panel 14 due to a rear collision or the like, deformation of the rear floor panel 14 on the vehicle front side is suppressed. Therefore, the amount of deformation of the floor front wall located on the vehicle front side of the rear floor panel 14 (the wall located below the side member 28 and standing from the rear floor panel 14) can be suppressed. Thereby, for example, members, such as a fuel tank arrange | positioned ahead of the vehicle rather than the rear floor panel 14, can be protected.

  Further, in the vehicle floor structure 10 according to the first embodiment of the present invention, the rear floor panel 14 is extended on both sides of the first bead portion 20 along the direction orthogonal to the first bead portion 20 from the panel surface. A plurality of protruding auxiliary beads 24 are formed. Therefore, the rigidity of the panel area | region of the both sides which pinched | interposed the 1st bead part 20 with this some auxiliary bead 24 can be equalized (stiffness can be stabilized).

  Thereby, since the boundary of the some 1st bead part 20 and the 2nd bead part 22 can be made into the rigid change point in the rear floor panel 14 reliably, the primary resonant frequency f1 of the rear floor panel 14 is set in the target range Rt. The design for storage becomes easier (the control of the primary resonance frequency f1 becomes easier).

  Further, by forming a plurality of auxiliary beads 24 on both sides of the first floor portion 14 of the rear floor panel 14, the area of the planar portion of both side panel regions of the first floor portion 14 of the rear floor panel 14 is reduced. Thereby, it can prevent that a wrinkle arises in the both-sides panel area | region which pinched | interposed the 1st bead part 20 of the rear floor panel 14 after the press molding of the rear floor panel 14. FIG. Thereby, the moldability of the rear floor panel 14 improves. The auxiliary bead 24 is not an essential component for the vehicle floor structure 10 and may be omitted.

  Next, a modified example of the vehicle floor structure 10 according to the first embodiment of the present invention will be described.

  In the first embodiment, the first bead portion 20 and the second bead portion 22 are formed so as to be suddenly widened by connecting the ridge lines 20A, B and the first ridge lines 22A, 22B. It may be as follows.

  For example, as in the first modification shown in FIG. 3, the second bead portion 22 has width direction side end faces 22E and 22F in the width direction from the longitudinal intermediate portion 18 toward the longitudinal end portion (vehicle rear side). A configuration in which the width gradually increases so as to spread linearly outward may be used.

  With this configuration, the rigidity of the rear floor panel 14 gradually increases from the first bead portion 20 formed on the bead 16 to the second bead portion 22 at a constant increase rate.

  Thereby, it is possible to prevent the rigidity of the rear floor panel 14 from rapidly changing in the longitudinal intermediate portion 18 which is a boundary between the first bead portion 20 and the second bead portion 22 formed in the bead 16. For this reason, even when a load is applied to the rear floor panel 14 in parallel to the panel surface due to a collision or the like, local deformation of the rear floor panel 14 at a portion where the longitudinal direction intermediate portion 18 of the bead 16 is located can be suppressed.

  In the first embodiment, the first bead portion 20 extends from the front end portion 14 </ b> A at the center position of the rear floor panel 14 to the vehicle rear side along the vehicle front-rear direction, and the second bead portion 22 extends from the rear floor panel 14. Although formed in the vicinity of the rear end portion 14B, it may be as follows.

  For example, as in the second modification shown in FIG. 4, the first bead portion 20 extends from the rear end portion 14 </ b> B of the center position of the rear floor panel 14 toward the vehicle front side along the vehicle front-rear direction, and the second bead The portion 22 may be formed in the vicinity of the front end portion 14A of the rear floor panel 14.

  With this configuration, the deformation of the rear floor panel 14 when a load is applied to the rear floor panel 14 parallel to the panel surface due to a rear impact or the like is caused by the boundary between the first bead portion 20 and the second bead portion 22 (that is, the rear floor). It can be concentrated on the vehicle front side of the rear floor panel 14 where the longitudinal intermediate portion 18, which is the rigidity change point of the panel 14, is located.

  Thereby, even when a load is applied in parallel to the panel surface from the vehicle rear side to the rear floor panel 14 due to a rear collision or the like, deformation of the rear floor panel 14 on the vehicle rear side can be suppressed. Therefore, since the deformation amount of the floor rear wall 26 positioned on the vehicle rear side of the rear floor panel 14 can be suppressed, for example, a member disposed on the vehicle rear side of the rear floor panel 14 can be protected.

  Moreover, in the said 1st embodiment, although the 1st bead part 20 was comprised by one in the bead 16, you may make it as follows.

  For example, as in the third modification shown in FIG. 5, the first bead portion 20 may be configured by a plurality of parallel bead portions 30 that are arranged in parallel in the width direction of the bead 16.

  Further, for example, as in the fourth modification shown in FIG. 6, the first bead portion 20 extends from the rear end portion 14 </ b> B of the center position of the rear floor panel 14 toward the vehicle front side along the vehicle front-rear direction, In the configuration in which the two bead portions 22 are formed in the vicinity of the front end portion 14 </ b> A of the rear floor panel 14, the first bead portion 20 is configured by two parallel bead portions 30 that are juxtaposed in the width direction of the bead 16. May be.

  As described above, when the first bead portion 20 is configured by the parallel bead portions 30 provided in parallel in the width direction of the bead 16, the multiple parallel bead portions 30 are formed on the rear floor panel 14. Since the panel surface is supported, the rigidity of the panel region formed around the first bead portion 20 can thereby be increased. In this modification, two parallel bead portions 30 are formed as an example, but two or more bead portions 30 may be formed.

  In the first embodiment, the bead 16 includes the second bead portion 22 only on one side in the longitudinal direction of the first bead portion 20.

  For example, as in the fifth modification shown in FIG. 7, the bead 16 may include the second bead portions 22 on both sides in the longitudinal direction of the first bead portion 20.

  In this case, the rigidity of the entire rear floor panel 14 including the bead 16 is set by setting the two longitudinal intermediate portions 18 of the bead 16 as the rigidity change point of the rear floor panel 14 to arbitrary positions in the longitudinal direction of the bead 16. By adjusting, it becomes possible to keep the primary resonance frequency f1 of the rear floor panel 14 having a large vibration area and easy sound generation within the target range Rt (the primary resonance frequency f1 can be freely controlled).

  Further, in the first embodiment, the bead 16 extends along the vehicle front-rear direction, but may be as follows.

  For example, as in the sixth modified example shown in FIG. 8 or the seventh modified example shown in FIG. 9, the bead 16 may be extended along the vehicle width direction. At this time, the bead 16 may have a configuration in which the second bead portion 22 is provided only on one side in the longitudinal direction as in the sixth modified example shown in FIG. 8, and the seventh modified example shown in FIG. Thus, the structure provided with the 2nd bead part 22 in a longitudinal direction both sides may be sufficient. Further, when the beads 16 are extended along the vehicle width direction in this way, the auxiliary beads 24 are preferably formed along the vehicle front-rear direction.

  In the first embodiment, the bead 16 extends along the vehicle front-rear direction. However, the bead 16 may be provided so as to be inclined with respect to the vehicle front-rear direction.

  In the first embodiment, one bead 16 is provided on the rear floor panel 14, but a plurality of beads 16 may be provided on the rear floor panel 14. In this case, each bead 16 may be provided to be inclined with respect to the vehicle front-rear direction, for example, V-shaped.

  Moreover, in the said 1st embodiment, although the vehicle floor structure 10 was applied to the rear part of the vehicle 12, you may apply the vehicle floor structure 10 to the floor panel located in a vehicle interior.

[Second Embodiment]
Next, the configuration of the vehicle floor structure 40 according to the second embodiment of the present invention will be described with reference to FIG.

  The vehicle floor structure 40 according to the second embodiment of the present invention is suitably applied to the vehicle 12 such as a passenger car, for example. In the present embodiment, as an example, the vehicle floor structure 40 is applied to the rear portion of the vehicle 12.

  In the vehicle floor structure 40 according to the present embodiment, a ridge bead 46 is formed on the rear floor panel 14 provided at the rear portion of the vehicle 12 so as to protrude from the panel surface to the vehicle upper side. The bead 46 is integrally formed when the rear floor panel 14 is press-molded. When the rear floor panel 14 is viewed from the lower side of the vehicle, the bead 46 is concave.

  In the present embodiment, the bead 46 includes a first bead portion 50 extending along the vehicle front-rear direction and a second bead portion extending in a direction intersecting the first bead portion 50 (vehicle width direction). 52.

  The first bead portion 50 mainly reinforces the center position of the rear floor panel 14 having the lowest rigidity, and extends from the front end portion 14A of the center position of the rear floor panel 14 to the vehicle rear side along the vehicle front-rear direction. Yes.

  The second bead portion 52 is formed in the vicinity of the rear end portion 14B of the rear floor panel 14. Further, the vehicle rear side of the second bead portion 52 is connected to the rear end portion 14 </ b> B of the rear floor panel 14. A central portion in the longitudinal direction of the second bead portion 52 is coupled to a longitudinal end portion of the first bead portion 50.

  In the present embodiment, a connecting portion 54 that is a boundary between the first bead portion 50 and the second bead portion 52 is provided on the vehicle rear side with respect to the center portion of the rear floor panel 14. As a result, the rigidity change point of the rear floor panel 14 formed by the connecting portion 54 that is the boundary between the first bead portion 50 and the second bead portion 52 formed in the bead 46 is more rearward than the center portion of the rear floor panel 14. Is set to the side.

  Next, the operation of the vehicle floor structure 40 according to the second embodiment of the present invention will be described.

  In the vehicle floor structure 40 according to the second embodiment of the present invention, a ridge bead 46 protruding from the panel surface is formed on the rear floor panel 14. According to this configuration, since the protruding bead 46 supports the panel surface of the rear floor panel 14, the rigidity of the entire rear floor panel 14 can be secured by the bead 46.

  In the vehicle floor structure 40 according to the second embodiment of the present invention, the bead 46 extends in the direction intersecting the first bead portion 50 and the first bead portion 50 extending along the vehicle front-rear direction. And a second bead portion 52 having a longitudinal center portion coupled to a longitudinal end portion of the first bead portion 50.

  According to this configuration, the connecting portion 54 between the first bead portion 50 and the second bead portion 52 formed in the bead 46 becomes a rigidity change point of the rear floor panel 14. For this reason, when the bead 46 and the rear floor panel 14 vibrate integrally, for example, at the time of primary resonance, the coupling portion 54 becomes an antinode of vibration at the time of primary resonance of the rear floor panel 14 (a trigger for folding at the time of primary resonance).

  At this time, if the connecting portion 54 of the first bead portion 50 and the second bead portion 52 that becomes the rigidity change point of the rear floor panel 14 moves in the longitudinal direction of the first bead portion 50 (vehicle longitudinal direction), the first bead By being orthogonal to the first bead portion 50 as compared to the portion 50, the panel area occupied by the rigid second bead portion 52 in the extending direction of the first bead portion 50 increases or decreases. When the panel area occupied by the second bead portion 52 increases or decreases, the rigidity of the entire rear floor panel 14 including the bead 46 increases or decreases, thereby changing the primary resonance frequency f1 (see FIG. 2) of the rear floor panel 14.

  Therefore, at the time of designing the rear floor panel 14, the connecting portion 54 between the first bead portion 50 and the second bead portion 52, which is a rigidity change point of the rear floor panel 14, is set at an arbitrary position in the longitudinal direction of the first bead portion 50. For example, as shown in FIG. 2, the primary resonance frequency f <b> 1 of the rear floor panel 14 can be within a target range Rt (for example, 65 Hz to 85 Hz).

  Thus, according to the vehicle floor structure 40 according to the second embodiment of the present invention, the first bead portion 50 and the first bead portion 50 that become the rigidity change point of the rear floor panel 14 are secured while the rigidity of the rear floor panel 14 is secured by the beads 46. By adjusting the rigidity of the entire rear floor panel 14 including the bead 46 by setting the connecting portion 54 to the two bead portions 52 at an arbitrary position in the longitudinal direction of the bead 46, the rear floor panel 14 having a large vibration area and easily generating sound. The primary resonance frequency f1 can be kept within the target range Rt (the primary resonance frequency f1 can be freely controlled).

  The acoustic sensitivity can be kept low by keeping the primary resonance frequency f1 of the rear floor panel 14 that has a large vibration area and is easy to sound within the target range Rt in this way. It is possible to reduce noise due to primary resonance.

  Further, in the vehicle floor structure 40 according to the second embodiment of the present invention, the first bead portion 50 is extended along the vehicle front-rear direction at the center position of the rear floor panel 14. Therefore, the center position with the lowest rigidity of the rear floor panel 14 can be reinforced by the first bead portion 50. Thereby, the rigidity of the center position of the rear floor panel 14 can be improved efficiently.

  Further, the first bead 50 of the rear floor panel 14 is secured by providing the first bead portion 50 in the center position of the rear floor panel 14 along the vehicle front-rear direction in this way. Panel regions on both sides of the part 50 can be used for component placement. Accordingly, the degree of freedom of component placement on the rear floor panel 14 is also increased.

  In the vehicle floor structure 40 according to the second embodiment of the present invention, the second bead portion 52 is formed in the vicinity of the rear end portion 14B of the rear floor panel 14. Accordingly, since the second bead portion 52 is close to the floor rear wall 26 connected to the rear end portion 14B of the rear floor panel 14, the rigidity of the second bead portion 52 can be efficiently increased. Thereby, even if it does not enlarge the 2nd bead part 52 more than necessary, the rigidity difference with the 1st bead part 50 is securable.

  In the vehicle floor structure 40 according to the second embodiment of the present invention, the boundary between the first bead portion 50 and the second bead portion 52 is provided on the vehicle rear side of the rear floor panel 14. Therefore, the deformation of the rear floor panel 14 when a load is applied to the rear floor panel 14 parallel to the panel surface due to a rear impact or the like is caused by the boundary between the first bead portion 50 and the second bead portion 52 (that is, the rigidity of the rear floor panel 14). It is possible to concentrate on the vehicle rear side of the rear floor panel 14 where the connecting portion 54 that is a change point) is located.

  For this reason, even when a load is applied in parallel to the panel surface from the vehicle rear side to the rear floor panel 14 due to a rear collision or the like, deformation of the rear floor panel 14 on the vehicle front side is suppressed. Therefore, the amount of deformation of the floor front wall located on the vehicle front side of the rear floor panel 14 (the wall located below the side member 28 and standing from the rear floor panel 14) can be suppressed. Thereby, for example, members, such as a fuel tank arrange | positioned ahead of the vehicle rather than the rear floor panel 14, can be protected.

  Next, a modified example of the vehicle floor structure 40 according to the second embodiment of the present invention will be described.

  In the second embodiment, the first bead portion 50 extends from the front end portion 14A at the center position of the rear floor panel 14 to the vehicle rear side along the vehicle front-rear direction, and the second bead portion 52 is the rear end of the rear floor panel 14. Although formed in the vicinity of the portion 14B, it may be as follows.

  For example, as in the first modification shown in FIG. 11, the first bead portion 50 extends from the rear end portion 14B of the center position of the rear floor panel 14 to the vehicle front side along the vehicle front-rear direction, and the second bead The portion 52 may be formed in the vicinity of the front end portion 14A of the rear floor panel 14.

  Moreover, in the said 2nd embodiment, although the panel surface of the both sides which pinched | interposed the 1st bead part 50 of the rear floor panel 14 was formed in planar shape, you may make it as follows.

  For example, as in the second modified example shown in FIG. 12 or the third modified example shown in FIG. 13, in the direction orthogonal to the first bead part 50 on both sides of the first floor part 14 of the rear floor panel 14. A plurality of auxiliary beads 56 may be formed that extend along the protrusion and protrude from the panel surface.

  As described above, when a plurality of auxiliary beads 56 are formed on both sides of the first floor portion 14 of the rear floor panel 14, the rigidity of the panel regions on both sides of the first bead portion 50 sandwiched by the plurality of auxiliary beads 56. Can be made uniform (stiffness can be stabilized).

  Thereby, since the boundary between the plurality of first bead portions 50 and the second bead portions 52 can be reliably set as the stiffness change point in the rear floor panel 14, the primary resonance frequency f1 of the rear floor panel 14 is within the target range Rt. The design for storage becomes easier (the control of the primary resonance frequency f1 becomes easier).

  In addition, by forming a plurality of auxiliary beads 56 on both sides of the first floor portion 14 of the rear floor panel 14, the planar area of both side panel regions of the first floor portion 14 of the rear floor panel 14 is reduced. Thereby, it can prevent that a wrinkle arises in the both-sides panel area | region which pinched | interposed the 1st bead part 50 of the rear floor panel 14 after the press molding of the rear floor panel 14. FIG. Thereby, the moldability of the rear floor panel 14 improves.

  Moreover, in the said 2nd embodiment, although the 1st bead part 50 was extended along the vehicle front-back direction and the 2nd bead part 52 was extended in the vehicle width direction, you may make it as follows.

  For example, as in the fourth modification shown in FIG. 14, the first bead portion 50 may be extended along the vehicle width direction, and the second bead portion 52 may be extended along the vehicle front-rear direction. . At this time, the bead 46 may be configured to include the second bead portions 52 on both sides in the longitudinal direction of the first bead portion 50 as in the fifth modification shown in FIG. 15.

  Further, as in the fifth modified example shown in FIG. 15, the first bead portion 50 extends along the vehicle width direction, and the second bead portions 52 are provided on both sides of the first bead portion 50 in the longitudinal direction. In the configuration extended along the first bead portion 50, the rear floor panel 14 is extended along the direction perpendicular to the first bead portion 50 (vehicle longitudinal direction) on both sides of the first bead portion 50, and protrudes from the panel surface. A plurality of auxiliary beads 56 for the ridges may be formed.

  Moreover, in the said 2nd embodiment, although the 1st bead part 50 was extended along the vehicle front-back direction, you may provide so that it may incline with respect to the vehicle front-back direction.

  Moreover, in the said 2nd embodiment, although the 1st bead part 50 was provided in the rear floor panel 14, multiple 1st bead parts 50 may be provided in the rear floor panel 14. In this case, each first bead portion 50 may be provided to be inclined with respect to the vehicle front-rear direction, for example, in a V shape.

  Moreover, in the said 2nd embodiment, although the vehicle floor structure 10 was applied to the rear part of the vehicle 12, you may apply the vehicle floor structure 10 to the floor panel located in a vehicle interior.

FIG. 1 is a perspective view showing a configuration of a vehicle floor structure according to a first embodiment of the present invention. FIG. 2 is a diagram showing the relationship between the resonance frequency and the acoustic sensitivity of the rear floor panel according to the first embodiment of the present invention. FIG. 3 is a view showing a first modification of the vehicle floor structure according to the first embodiment of the present invention. FIG. 4 is a view showing a second modification of the vehicle floor structure according to the first embodiment of the present invention. FIG. 5 is a view showing a third modification of the vehicle floor structure according to the first embodiment of the present invention. FIG. 6 is a view showing a fourth modification of the vehicle floor structure according to the first embodiment of the present invention. FIG. 7 is a view showing a fifth modification of the vehicle floor structure according to the first embodiment of the present invention. FIG. 8 is a view showing a sixth modification of the vehicle floor structure according to the first embodiment of the present invention. FIG. 9 is a view showing a seventh modification of the vehicle floor structure according to the first embodiment of the present invention. FIG. 10 is a perspective view showing a configuration of a vehicle floor structure according to the second embodiment of the present invention. FIG. 11 is a view showing a first modification of the vehicle floor structure according to the second embodiment of the present invention. FIG. 12 is a view showing a second modification of the vehicle floor structure according to the second embodiment of the present invention. FIG. 13 is a view showing a third modification of the vehicle floor structure according to the second embodiment of the present invention. FIG. 14 is a view showing a fourth modification of the vehicle floor structure according to the second embodiment of the present invention. FIG. 15 is a view showing a fifth modification of the vehicle floor structure according to the second embodiment of the present invention.

Explanation of symbols

10, 40 Vehicle floor structure 14 Rear floor panel 16, 46 Bead 20, 50 First bead part 22, 52 Second bead part 24, 56 Auxiliary bead 30 Side-by-side bead

Claims (9)

In the vehicle floor structure in which the bead of the ridge protruding from the panel surface is formed on the floor panel,
The bead includes a first bead portion on one side sandwiching the intermediate portion in the longitudinal direction and a second bead portion formed wider than the first bead portion on the other side sandwiching the intermediate portion in the longitudinal direction. A vehicle floor structure characterized by that.   2. The second bead portion gradually increases in width so that both end surfaces in the width direction linearly spread outward in the width direction as it goes from the intermediate portion in the longitudinal direction toward the end portion in the longitudinal direction. Vehicle floor structure.   3. The vehicle floor structure according to claim 1, wherein the first bead portion includes a plurality of side-by-side bead portions arranged in parallel in the bead width direction. In the vehicle floor structure in which the bead of the ridge protruding from the panel surface is formed on the floor panel,
The bead includes a first bead portion extending along one direction;
A vehicle floor structure comprising: a second bead portion extending in a direction intersecting with the first bead portion and having a longitudinal intermediate portion coupled to a longitudinal end portion of the first bead portion.   The vehicle according to any one of claims 1 to 4, wherein the first bead portion is provided at a center position of the floor panel along a vehicle front-rear direction or a vehicle width direction. Floor structure.   The vehicle floor structure according to any one of claims 1 to 5, wherein the second bead portion is formed at a position near an end of the floor panel.   The vehicle floor structure according to any one of claims 1 to 6, wherein a boundary between the first bead portion and the second bead portion is provided on a vehicle rear side of the floor panel. .   The vehicle floor structure according to any one of claims 1 to 6, wherein a boundary between the first bead portion and the second bead portion is provided on a vehicle front side of the floor panel. .   On both sides of the first bead portion of the floor panel, a protruding auxiliary bead extending along the direction intersecting the first bead portion and protruding from the panel surface is formed. The vehicle floor structure according to any one of claims 1 to 8.

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