JP4957270B2 - Body floor structure - Google Patents

Description

  The present invention relates to a vehicle body floor structure.

2. Description of the Related Art Conventionally, in a lower body structure of a vehicle, a structure in which a load transmission member (brace) for connecting left and right body floor portions across a floor tunnel portion is provided has been devised (see, for example, Patent Document 1). This brace is made of a pipe material, and both ends that are flattened are fastened to the vehicle floor by bolts and nuts.
JP-A-9-207824

  However, in the brace as described above, it is necessary to sufficiently secure the flatness of both ends of the brace (pipe material) in order to securely fasten the brace to the vehicle body floor with bolts and nuts. For this reason, when crushing the both ends of a pipe material, a big load must be applied and processing becomes complicated.

  In consideration of the above facts, the present invention can transmit a load between the left and right floor portions of the floor tunnel portion through the pipe material, and the pipe material can be fixed to the floor panel without complicated processing. It is an object to obtain a vehicle body floor structure that can be used.

  The vehicle body floor portion structure according to the first aspect of the present invention includes a floor panel in which a floor tunnel portion is formed along the longitudinal direction of the vehicle body and floor portions are provided on the left and right of the floor tunnel portion, and the floor tunnel portion. A pipe member for connecting the left and right floors across the base, a pair of upper and lower brackets each sandwiched between the pipe members in the axial direction, A fixed portion provided on the bracket and fixed to the floor panel, and provided on the bracket on the upper side and disposed to face a side portion of the floor tunnel portion, to the floor tunnel portion toward the floor tunnel portion side And a load input portion to which a load is input from the side portion when a directed load is applied.

  In the vehicle body floor structure according to claim 1, the pipe material for connecting the left and right floor portions across the floor tunnel portion of the floor panel is configured so that both ends in the axial direction are sandwiched between a pair of upper and lower brackets. Is bound to. The lower bracket is provided with a fixing portion that is fixed to the floor panel. Therefore, the pipe material can be fixed to the floor panel without performing complicated processing on the pipe material. Further, the upper bracket is provided with a load input portion arranged to face the side portion of the floor tunnel portion. A load is input to the load input portion when a load directed toward the floor tunnel portion is applied to the floor portion. Therefore, since the load can be transmitted to the pipe material by both the upper bracket and the lower bracket, the load can be favorably transmitted between the left and right floor portions via the pipe material.

  The vehicle body floor structure according to claim 2 is the vehicle body floor structure according to claim 1, wherein the pair of upper and lower brackets are coupled to each other to form a closed cross section on one end side, and the closed cross section is formed. An axial end portion of the pipe material is accommodated therein, the fixing portion is provided on the other end side of the lower bracket, and the load input portion is provided on the other end of the upper bracket. It is characterized by.

  In the vehicle body floor structure according to claim 2, the load input to the upper bracket from the load input portion provided to the other end of the upper bracket and the fixing portion provided to the other end of the lower bracket The load input to the lower brackets is transmitted to the pipe member in which the axial end portion is accommodated in the closed cross section formed on one end side of these brackets. In this vehicle body floor structure, since the closed cross section is formed on one end side of the pair of upper and lower brackets, the rigidity in the coupled state of the pair of upper and lower brackets can be improved.

  The vehicle body floor structure according to the invention described in claim 3 is the vehicle body floor structure according to claim 1 or 2, wherein the floor tunnel portion includes a tunnel main body that bulges upward from the floor portion. A tunnel side member provided on both sides of the tunnel body in the vehicle width direction and bulging downward on the floor portion, and the fixing portion is fixed to a lower portion of the tunnel side member, and the load input portion Is arranged to face the side of the tunnel side member.

  In the vehicle body floor structure according to claim 3, the fixing portion provided in the lower bracket is fixed to the lower portion of the tunnel side member, and the load input portion provided in the upper bracket is on the tunnel side member side. It is arranged to face the part. The tunnel side member bulges downward on the floor. For this reason, the pipe member coupled to the pair of upper and lower brackets can be disposed on the lower side of the floor portion (that is, on the lower side with respect to the tunnel main body bulged to the upper side of the floor portion). Therefore, the space in the tunnel body can be prevented from being eroded by the pipe material.

  As described above, in the vehicle body floor structure according to claim 1 of the present invention, a load can be transmitted between the left and right floor portions of the floor tunnel portion through the pipe material, and complicated processing is performed on the pipe material. Even if not applied, the pipe material can be fixed to the floor panel.

  In the vehicle body floor structure according to claim 2 of the present invention, it is possible to improve the rigidity in the coupled state of the pair of upper and lower brackets.

  In the vehicle body floor structure according to claim 3 of the present invention, the space in the tunnel body can be prevented from being eroded by the pipe material.

<First Embodiment>
A first embodiment of the present invention will be described with reference to FIGS. In the figure, the arrow FR indicates the vehicle body front direction, the arrow UP indicates the vehicle body upward direction, and the arrow IN indicates the vehicle width inside direction.

  As shown in FIG. 1, the vehicle body floor portion according to the first embodiment includes a floor panel 12 formed by pressing a metal plate. A floor tunnel portion 14 is formed in the vehicle width direction center portion of the floor panel 12 along the longitudinal direction of the vehicle body, and floor portions 16 and 18 are provided on the left and right sides of the floor tunnel portion 14.

  The floor tunnel portion 14 has a tunnel body 20 that bulges upward from the left and right floor portions 16 and 18. The tunnel body 20 is formed in a substantially U-shaped cross section and opens to the lower side of the vehicle body. On both sides of the tunnel body 20 in the vehicle width direction, tunnel side members 22 bulging to the lower side of the left and right floor portions 16 and 18 are provided. These tunnel side members 22 constitute a floor tunnel portion 14 together with the tunnel main body 20, and are formed in a U-shaped cross section and open upward.

  A load transmission member 24 is provided along the vehicle width direction between the tunnel side members 22 on the lower side of the tunnel body 20. The load transmission member 24 has a pipe brace 26 (pipe material) for connecting the left and right floor portions 16 and 18 across the floor tunnel portion 14. The pipe brace 26 is formed in a cylindrical shape with a circular cross section by a metal material, and is arranged in a state where the axial direction is along the vehicle width direction. Both ends in the axial direction of the pipe brace 26 are sandwiched between a pair of upper and lower brackets 28 and 30 formed by pressing a metal plate.

  The lower bracket 30 (hereinafter referred to as the lower bracket 30) is formed in a rectangular shape that is long in the vehicle width direction in plan view. As shown in FIG. 3, both end portions of the lower bracket 30 in the longitudinal direction of the vehicle body are bent at right angles toward the lower side, and a pair of front and rear reinforcing portions 30A are formed. These reinforcing portions 30 </ b> A improve the bending rigidity of the lower bracket 30.

  In addition, a recessed seat 30B that opens upward is formed in the vehicle longitudinal direction center of the lower bracket 30 along the vehicle width direction. The concave seat 30B is formed by providing a bulging portion 30C bulging in a cross-sectional arc shape toward the lower side at the vehicle longitudinal direction center portion of the lower bracket 30. Extends from one longitudinal end portion (inner end portion in the vehicle width direction) to the other end portion in the longitudinal direction (outer end portion in the vehicle width direction). At the other end in the longitudinal direction of the lower bracket 30, the bulging amount of the bulging portion 30C is gradually reduced, and the width dimension and the depth dimension of the recessed seat 30B are gradually reduced.

  On the one end side in the longitudinal direction of the lower bracket 30, the above-described axial end portion of the pipe brace 26 is accommodated in the concave seat 30 </ b> B (see FIG. 4). However, the depth dimension of the concave seat 30B on one end side in the longitudinal direction of the lower bracket 30 is set to be smaller than the diameter of the pipe brace 26, and the upper end portion of the pipe brace 26 is outside the concave seat 30B (lower side). Projecting to the upper side of the bracket 30. The inner diameter of the concave seat 30B is formed to be approximately the same as the diameter of the pipe brace 26, and the lower half of the outer peripheral surface of the pipe brace 26 is in close contact with the inner peripheral surface of the concave seat 30B. Yes.

  In the vicinity of the opening of the concave seat 30B above the contact portion, the inner peripheral surface of the concave seat 30B and the outer peripheral surface of the pipe brace 26 are separated on both sides of the pipe brace 26 in the longitudinal direction of the vehicle body. The lower bracket 30 and the pipe brace 26 are joined (coupled) by arc welding (in FIG. 4, reference numeral 31 is given to the welding location).

  A fixing portion 30 </ b> D for fixing the lower bracket 30 to the floor panel 12 is provided at the other longitudinal end portion of the lower bracket 30. The fixing portion 30D is disposed in contact with the lower surface of the lower wall 22A (lower portion) of the tunnel side member. A pair of front and rear through holes 32 are formed in the fixing portion 30D, and these through holes 32 are arranged coaxially with the pair of through holes 34 formed in the lower wall 22A of the tunnel side member 22. . Bolts 36 are inserted into the through holes 32 and 34, and nuts 38 provided on the upper side of the lower wall 22 </ b> A are screwed into the bolts 36. Accordingly, the lower bracket 30 is fastened and fixed to the lower wall 22A (floor panel 12) of the tunnel side member 22, and the pipe brace 26 is fixed to the floor panel 12 via the lower bracket 30.

  On the other hand, like the lower bracket 30, the upper bracket 28 (hereinafter referred to as the upper bracket 28) is formed in a rectangular shape that is long in the vehicle width direction in plan view. However, the upper bracket 28 is formed so that the length dimension along the vehicle width direction and the width dimension along the vehicle body longitudinal direction are both shorter than that of the lower bracket 30. The upper bracket 28 is located above the lower bracket 30 in the vehicle longitudinal direction center of the lower bracket 30 with one end in the longitudinal direction (end in the vehicle width direction) aligned with one end in the longitudinal direction of the lower bracket 30. It is arranged in the part. Both end portions in the front-rear direction of the upper bracket 28 are joined (coupled) to the upper surface of the lower bracket 30 by arc welding (in FIG. 3 and FIG. 4, reference numeral 33 is given to the welding location). For this reason, the upper bracket 28 and the lower bracket 30 form a closed cross section in which the axial end of the pipe brace 26 is accommodated.

  A concave seat 28 </ b> A that opens downward is formed in the vehicle longitudinal direction center of the upper bracket 28 (a position facing the concave seat 30 </ b> B of the lower bracket 30) along the vehicle width direction. The concave seat 28A is formed by providing a bulging portion 28B bulging in a substantially U-shaped cross section toward the upper side at the center of the upper bracket 28 in the longitudinal direction of the vehicle body. It extends from one end in the longitudinal direction (inner end in the vehicle width direction) to the other end in the longitudinal direction (outer end in the vehicle width direction).

  The depth dimension of the concave seat 28 </ b> A on one end side in the longitudinal direction of the upper bracket 28 is set to be approximately the same as the projecting height dimension of the pipe brace 26 projecting from the upper surface of the lower bracket 30. For this reason, as shown in FIG. 4, the upper end portion of the pipe brace 26 is in contact with the concave seat 28A (the inner surface of the bulging portion 28B). A long hole 28C is formed on one end side in the longitudinal direction of the bulging portion 28B, and the hole edge of the long hole 28C and the upper end portion of the pipe brace 26 are joined by arc welding (see FIG. 3 and FIG. 3). In FIG. 4, the reference numeral 35 is given to the welded part). Thereby, the upper side bracket 28 and the pipe brace 26 are couple | bonded.

  When the upper bracket 28 and the lower bracket 30 are coupled to the pipe brace 26, the lower bracket 30 is first joined to the pipe brace 26. Thereafter, the upper bracket 28 is joined to the lower bracket 30, and finally the hole edge portion of the long hole 28 </ b> C of the upper bracket 28 is joined to the pipe brace 26.

  On the other hand, at the other end in the longitudinal direction of the upper bracket 28, the height dimension of the bulging portion 28B is increased stepwise. The other end surface in the longitudinal direction of the bulging portion 28B is a load input surface 28D as a load input portion. The load input surface 28 </ b> D is formed in a substantially U-shape and is disposed to face the side wall 22 </ b> B (side portion of the floor tunnel portion 14) on the inner side in the vehicle width direction of the tunnel side member 22. The load input surface 28D and the side wall 22B are arranged close to each other, and when a load directed to the floor tunnel portion 14 side acts on the floor portion 16 (or the floor portion 18), the load input from the side wall 22B. A load is input to the surface 28D.

  The reason why the gap is provided between the load input surface 28D and the side wall 22B is to absorb dimensional errors of the load transmitting member 24 and the floor tunnel portion 14, and these dimensional accuracy can be secured satisfactorily. In this case, the load input surface 28D and the side wall 22B may be arranged in contact with each other.

  Next, the operation of the first embodiment will be described.

  In the load transmission member 24 having the above-described configuration, the end portion in the axial direction of the pipe brace 26 is coupled to both in a state of being sandwiched between a pair of upper and lower brackets 28 and 30. A fixing portion that is fixed to the floor panel 12 (the lower wall 22A of the tunnel side member 22) is provided on the other end in the longitudinal direction of the lower bracket 30. Therefore, the pipe brace 26 can be fixed to the floor panel 12 without performing complicated processing on the pipe brace 26.

  In this load transmission member 24, the load input surface 28D provided at the other longitudinal end of the bulging portion 28B of the upper bracket 28 is opposed to the side wall 22B of the tunnel side member 22 (side portion of the floor tunnel portion 14). Closely arranged. Accordingly, when a load directed toward the floor tunnel portion 14 is applied to the floor portion 16 (or the floor portion 18) (for example, when a vehicle collides with the side), the lower bracket fixed to the floor panel 12 is used. A load is transmitted to the pipe brace 26 through 30, and a load is input from the side of the floor tunnel portion 14 to the load input surface 28 </ b> D of the upper bracket 28. The load input to the load input surface 28D is transmitted to the pipe brace 26 through the upper bracket 28. Accordingly, since the load can be transmitted to the pipe brace 26 by both the upper bracket 28 and the lower bracket 30, the load is transmitted (distributed) well between the left and right floor portions 16 and 18 via the pipe brace 26. be able to.

  Moreover, in the first embodiment, a closed cross section is formed at one longitudinal end side of the pair of upper and lower brackets 28 and 30 joined to each other, and the axial end of the pipe brace 26 accommodated in the closed cross section is formed. The portion is coupled to a pair of upper and lower brackets 28 and 30. Thus, since the pair of upper and lower brackets 28 and 30 form a closed cross section, the rigidity of the pair of upper and lower brackets 28 and 30 in the coupled state can be improved. Therefore, a load can be transmitted more favorably between the left and right floor portions 16 and 18.

  In the load transmitting member 24 according to the first embodiment, a moment does not act so much at the side collision of the vehicle on the portion where the pair of upper and lower brackets 28 and 30 are disposed (attachment portion to the floor panel 12). However, a large moment acts on the portion where the pipe brace 26 is disposed. That is, in the load transmission member 24 according to the first embodiment, a high-tensile pipe brace 26 is disposed in a portion where a large moment acts, and a lightweight and inexpensive sheet metal bracket is disposed in a portion where the moment does not act so much. 28 and 30 are arranged. For this reason, the weight of the load transmitting member 24 as a whole can be reduced, and the proof stress required at the time of a side collision can be optimally designed. In addition, as described above, since it is not necessary to perform complicated processing on the pipe brace 26, the manufacturing cost of the load transmitting member 24 as a whole can be reduced.

  In the first embodiment, since the lower bracket 30 fixed to the floor panel 12 is made of sheet metal, the flatness of the fixing portion 30D of the lower bracket 30 can be easily ensured. Therefore, the fastening torque of the bolt 36 and the nut 38 that fastens the fixing portion 30D to the floor panel 12 can be maintained as set.

  Furthermore, in the first embodiment, the fixing portion 30D of the lower bracket 30 is fixed to the lower wall 22A of the tunnel side member 22 bulging to the lower side of the floor portions 16 and 18, and the upper bracket 28 The load input surface 28 </ b> D faces the side wall 22 </ b> B of the tunnel side member 22. For this reason, the pipe brace 26 coupled to the pair of upper and lower brackets 28 and 30 is disposed below the floors 16 and 18 (downward with respect to the tunnel body 20 bulging above the floors 16 and 18). Can be placed. Therefore, the space in the tunnel main body 20 can be prevented from being eroded by the pipe brace 26 and the pair of upper and lower brackets 28 and 30.

  In the first embodiment, the upper bracket 28 is provided with the bulging portion 28B having a substantially U-shaped cross section, so that the bending rigidity of the upper bracket 28 is improved. Moreover, the height dimension of the bulging portion 28B is increased at the other end in the longitudinal direction of the upper bracket 28, and a load input surface 28D provided on the bulging portion 28B is formed in a substantially U-shape (load input). The surface 28D has a portion extending in the vertical direction and a portion extending in the horizontal direction. For this reason, when the load is input to the load input surface 28D from the side wall 22B of the tunnel side member 22, it is possible to effectively suppress the bulging portion 28B and the upper bracket 28 from being deformed.

  In the first embodiment, the load transmitting member 24 (pipe brace 26) is arranged along the vehicle width direction in order to transmit the load between the left and right floor portions 16 and 18 at the time of a side collision of the vehicle. However, the present invention is not limited to this. For example, in order to transmit a load between the left and right floor portions 16 and 18 at the time of an offset collision, the load transmitting member 24 is set in the vehicle width direction (vehicle body longitudinal direction). It is preferable to arrange them diagonally.

  In the first embodiment, the load input surface 28D (load input portion) provided on the upper bracket 28 is disposed so as to face the side wall 22B (side portion of the floor tunnel portion 14) of the tunnel side member 22. In addition to this, in addition to this, a load input part may be provided as an auxiliary in the lower bracket 30, and the load input part may be arranged to face the side part of the floor tunnel part 14. In this case, for example, a load input portion facing the side portion of the floor tunnel portion 14 can be formed by raising a part of the other end in the longitudinal direction of the lower bracket 30 upward. In this way, when a load directed to the floor tunnel portion 14 side acts on the floor portion 16 (or the floor portion 18), the load input portion of the lower bracket 30 from the side portion of the floor tunnel portion 14 is applied. Since the load is input, the load transmission efficiency to the pipe brace 26 via the lower bracket 30 can be improved.

Furthermore, in the said 1st Embodiment, although it was set as the structure by which the pipe brace 26 (pipe material) was formed in the cross-sectional circle shape, this invention is not restricted to this, The cross-sectional shape of a pipe material can be changed suitably. For example, it may be formed in an elliptical shape or a polygonal shape.
<Second Embodiment>
Next, a second embodiment of the present invention will be described. In addition, about the structure and operation | movement fundamentally similar to the said 1st Embodiment, the same code | symbol as the said 1st Embodiment is provided, and the description is abbreviate | omitted.

  FIG. 5 is a vertical sectional view showing a partial configuration of a vehicle body floor portion of an automobile configured by applying the vehicle body floor portion structure according to the second embodiment of the present invention. This embodiment has basically the same configuration as the first embodiment. However, in this embodiment, the pair of left and right tunnel side members 22 of the floor tunnel portion 14 is omitted, and the fixing portion 30D of the lower bracket 30 is fixed to the floor portions 16,18. Further, the upper bracket 28 is disposed inside the tunnel body 20, and the load input surface 28 </ b> D is disposed so as to face (abut or approach) the side wall 20 </ b> A of the tunnel body 20.

  In this embodiment, the upper bracket 28 and the upper end side of the pipe brace 26 are arranged inside the tunnel main body 20, so that the space in the tunnel main body 20 is slightly narrowed, but otherwise, the first embodiment is different from the first embodiment. There are basically the same effects.

1 is a longitudinal sectional view showing a partial configuration of a vehicle body floor portion of an automobile configured by applying a vehicle body floor portion structure according to a first embodiment of the present invention. It is the expanded sectional view which expanded a part of FIG. It is a perspective view which shows the partial structure of the load transmission member which comprises the vehicle body floor part structure which concerns on the 1st Embodiment of this invention. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 1 is a longitudinal sectional view showing a partial configuration of a vehicle body floor portion of an automobile configured by applying a vehicle body floor portion structure according to a first embodiment of the present invention.

Explanation of symbols

12 Floor panel 14 Floor tunnel part 16 Floor part on the left side of the car body 18 Floor part on the right side of the car body 20 Tunnel body 20A Side wall (side part of the floor tunnel part)
22 Tunnel side member 22A Lower wall (below the tunnel side member)
22B Side wall (side of floor tunnel)
26 Pipe brace (pipe material)
28 Upper bracket 28D Load input surface 30 Lower bracket 30D Fixed part

Claims (3)

A floor panel in which a floor tunnel portion is formed along the longitudinal direction of the vehicle body, and a floor panel is provided on the left and right of the floor tunnel portion, and
A pipe material for connecting the left and right floor portions across the floor tunnel portion;
A pair of upper and lower brackets each sandwiching the axial end of the pipe material between each other and each coupled to the pipe material;
A fixing portion provided on the lower bracket and fixed to the floor panel;
A load is input from the side portion when a load is provided on the upper bracket and is opposed to the side portion of the floor tunnel portion, and a load directed to the floor tunnel portion side acts on the floor portion. A load input section;
A vehicle body floor structure.   The pair of upper and lower brackets are coupled to each other to form a closed cross section at one end side, accommodate the axial end portion of the pipe material in the closed cross section, and the fixing portion is the other of the lower bracket. The vehicle body floor structure according to claim 1, wherein the vehicle body floor portion structure is provided on an end side, and the load input portion is provided on the other end of the upper bracket.   The floor tunnel portion has a tunnel body that bulges to the upper side of the floor portion, a tunnel side member that is provided on both sides in the vehicle width direction of the tunnel body, and bulges to the lower side of the floor portion, The said fixing | fixed part is fixed to the lower part of the said tunnel side member, The said load input part is arrange | positioned facing the side part of the said tunnel side member, The Claim 1 or Claim 2 characterized by the above-mentioned. Car body floor structure.

Images