JP7115134B2 - Body parts, body part assemblies, and body structures - Google Patents

Description

The present invention relates to a vehicle body component, a vehicle body component assembly, and a vehicle body structure including the same.

In Patent Document 1, a gradual change portion that gradually and continuously changes in the longitudinal axis direction from the collision front end side to the collision rear end side in the longitudinal axis direction is formed, and the cross-sectional area perpendicular to the axis at the collision front end side A vehicle body member member for an automobile is disclosed in which a stepped bead extending over the entire length in the longitudinal direction is formed on the wall surfaces of both vertical walls by increasing the axis-perpendicular cross-sectional area of the rear end of the collision.

However, such a vehicle body member member has a problem that the gradual deformation affects the design of the mounting mating surface of the vehicle body, resulting in an increase in production cost. Furthermore, when a bracket or the like is attached to this member, not only the axial compressive load but also the bending load may be input to the bracket mounting portion. If the section collapses early due to the bending load toward the collision front end side where the cross section is small, there is a concern that the effect of the collision rear end side where the cross section is enlarged may not be exhibited.

Japanese Patent No. 5534966

The present invention has been made in view of the actual situation as described above, and an object of the present invention is to provide a vehicle body part that is advantageous in terms of design and production costs while ensuring resistance to axial compressive loads, and the vehicle body part. An object of the present invention is to provide a vehicle body parts assembly and a vehicle body structure which are also advantageous in ensuring resistance to simultaneous input of axial compressive load and bending load.

In order to solve the above problems, the present invention
A vehicle body part for a cross member to be joined to a floor panel of a vehicle body, comprising:
a top surface extending in the longitudinal direction of the part; a pair of side surfaces continuously extending downward from both sides of the top surface and extending in the axial direction; a pair of flanges extending laterally through and extending in the axial direction;
The distance between the pair of flange portions is uniform over the entire axial direction,
The pair of side surface portions has a step portion extending in the axial direction at an intermediate portion in the height direction, includes an upper side portion and a lower side portion separated by the step portion, and has a width of the step portion. includes a narrowed width section that gradually narrows toward one end side in the axial direction, and the width of the upper surface portion and the distance between the pair of side surface portions at the upper portion of the side surface is equal to the narrowed width section in the axial direction. In the body parts, which are gradually enlarged in the corresponding sections.

The present invention also provides a vehicle body parts assembly including a cross member made of the vehicle body part described above and a bracket joined adjacent to the one end side of the cross member, wherein the bracket is attached to the upper surface of the cross member. There is also a body part assembly comprising a leg extending upwardly from the part and a mounting part for another part located at the upper end of said leg.

The vehicle body part according to the present invention, with the above configuration, has an effective width against an axial compressive load due to the provision of the stepped portion, and the cross-sectional enlargement due to the provision of the width reduction section of the stepped portion, thereby increasing the effective width against the axial compressive load. The cross-sectional shape below the lower part of the side and the interval between the flanges that connect to the vehicle body floor panel are uniform in the longitudinal direction, maintaining versatility as a vehicle body part. It is also possible to avoid design changes on the vehicle body side and an increase in production costs associated therewith.

In addition, the vehicle body part assembly according to the present invention includes a bracket joined adjacent to the one end side of the cross member. is input as a downward bending load, but at the site where the bending load acts, the component force in the direction of widening the cross member side surface due to the axial compressive load and the side surface due to the bending load are compressed inward. The effect of suppressing the deformation of the floor cross member can be expected by canceling out the force component, which is advantageous in terms of ensuring resistance to simultaneous input of axial compressive load and bending load.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the vehicle body structure provided with the vehicle body component of this invention embodiment. It is a principal part perspective view which shows the installation site|part of the vehicle body component of this invention embodiment. It is a principal part side view which shows the vehicle body component of this invention embodiment. (a) is a sectional view taken along line AA of FIG. 3, (b) is a sectional view taken along line BB, (c) is a sectional view taken along line CC, and (d) is a sectional view taken along line DD. (a) is a side view of the main part showing the axial load input to the vehicle body part of the embodiment of the present invention, (b) is a DD sectional view of (a), and (c) is a BB section of (a). It is a diagram.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a vehicle body structure in which a vehicle body part according to the invention is implemented as a floor cross member 4 . In the figure, a floor panel 10 defining the floor surface of the vehicle compartment is located between side sills 1 extending in the vehicle length direction Fw on both sides of the vehicle body and a floor tunnel 2 extending in the vehicle length direction Fw at the center of the vehicle width direction W. are arranged.

The floor cross member 4 has its longitudinal axis in the vehicle width direction W, is joined to the upper surface of the floor panel 10 , and extends between the side sill 1 and the floor tunnel 2 . The floor crossmembers 4 are provided symmetrically on both sides of the floor tunnel 2, but only the right side floor crossmember 4 is shown in FIG. 1, and the left side floor crossmember is hidden by the right cowl side. ing.

FIG. 2 shows the installation site of the floor cross member 4, in which only the side sill inner 11 of the side sill 1 is shown. On the lower surface of the floor panel 10, a floor side member 3 extends substantially in the vehicle length direction Fw so as to intersect with the extending portion of the floor cross member 4, and between the floor side member 3 and the floor panel 10. A closed cross section is formed.

The floor tunnel 2 has inclined side surfaces 26 on both sides of a flat upper surface 21, and the edge portion 12 of the floor panel 10 is overlapped and joined to a flange 22 extending outward in the vehicle width direction W from the lower end thereof, A closed cross section 20 is formed between the flange 22 .

(Floor cross member as a vehicle body part)
The floor cross member 4 is a channel-shaped vehicle body structural element formed by press forming a metal plate such as a steel plate, and basically has a uniform hat-shaped cross section in the longitudinal direction (the vehicle width direction W in FIG. 2). have.

That is, as shown in FIGS. 2 to 4, the floor cross member 4 has an upper surface portion 40 extending in the longitudinal direction, and a pair of side surface portions extending downward continuously on both sides of the upper surface portion 40 and extending in the axial direction. 41, a pair of laterally extending and axially extending flange portions 45 are provided continuously from the lower ends thereof, and the interval between the flange portions 45 is uniform (4w) over the entire axial direction.

Side portions 41 on both sides of the floor cross member 4 are formed with stepped portions 42 extending in the axial direction at intermediate portions in the height direction. With respect to the side lower part 43, the side upper part 44 is retreated toward the center by the stepped part 42, and the distance between the side upper part 44 is narrower than the distance between the side lower part 43 and the flange part 45. It's becoming

However, the width of the stepped portion 42 is not constant over the entire length, and in the illustrated example, there is a reduced width section 42a at one end side of the axial direction joined to the side sill 1 (11), which gradually narrows toward the same side. As shown in FIG. 4D, the interval between the side upper portions 44 (and the width of the upper surface portion 40) gradually increases in this section. The width of the stepped portion 42 is constant except for the reduced-width section 42a, and the cross-sectional shape of the floor cross member 4 is also the shape shown in FIG. 4(a).

3 and 4(c), at one end 47 of the floor cross member 4, the stepped portion 42 between the side upper portion 44 and the side lower portion 43 disappears, and the lower end of the side lower portion 43 disappears. A flange portion 45 laterally extending from the side sill inner 11 is connected to the one end portion 47 .

Further, as shown in FIG. 2 , at the other end 46 of the floor cross member 4 , the flange portion 45 continues to the other end 46 and serves as a joint surface to the side surface 26 of the floor tunnel 2 . A weight reduction hole 48 is provided in the side lower portion 43 at substantially the middle portion of the floor cross member 4 in the longitudinal axis direction.

(Body parts assembly including bracket)
The floor cross member 4 having the above structure is attached to the vehicle body as a floor cross member ASSY (aggregate) by previously joining the seat brackets 5 and 6 formed by press forming a metal plate such as a steel plate. The structure and joining of the seat brackets 5 and 6 will be described below.

First, the seat bracket 5 joined adjacent to one end portion 47 of the floor cross member 4 joined to the side sill 1 (11) has a pair of inclined surfaces 51, 52 extending upward from the upper surface portion 40 of the floor cross member 4. and a flat mounting portion 50 extending between their upper ends, and the pair of inclined surfaces 51 and 52 are located closer to the upper surface of the floor cross member 4 than the distance between the upper ends continuing to the mounting portion 50. It has an inclination that widens the interval between the lower ends joined to the portion 40, and has a trapezoidal or inverted V-shaped basic shape as a whole.

A first inclined surface 51 positioned on the one end 47 side of the floor cross member 4 with respect to the mounting portion 50 of the seat bracket 5 includes a bottom surface portion 53 extending continuously from the lower end thereof toward the one end portion 47 side and both sides thereof. and a side portion 55 extending downward continuously from the floor cross member 4 and joined to the side upper portion 44 of the floor cross member 4 . The bottom portion 53 has an extension portion 58 that extends beyond the one end portion 47 of the floor cross member 4 and is joined to the upper portion of the inner side sill 11 .

A second inclined surface 52 located on the side opposite to the one end portion 47 with respect to the mounting portion 50 has a bottom surface portion 54 extending continuously from the lower end thereof toward the other end portion 46 side, and a bottom surface portion 54 continuously extending downward from both sides thereof. and a side portion 56 joined to the side upper portion 44 of the extended floor cross member 4 .

A side flange portion 57 that is continuous with the side portion 55 and the side portion 56 is formed on the side surface of the seat bracket 5 . Also, the bending rigidity of the mounting portion 50 is ensured, and the rigidity of the seat bracket 5 as a whole is enhanced.

The seat bracket 5 configured as described above is spot-welded to the side upper portion 44 of the floor cross member 4 at the side portions 55 and 56 at two points 55a and 56a, respectively, and the upper surface of the floor cross member 4 at the bottom portions 53 and 54. It is spot welded to the portion 40 . Although spot welding (resistance welding) is assumed in the illustrated example, other methods such as laser welding may be used for joining.

Next, the seat bracket 6 joined to the other end portion 46 of the floor cross member 4 has an inclined surface 61 extending obliquely upward from the upper surface portion 40 of the floor cross member 4, a flat mounting portion 60 continuous to the upper end of the inclined surface 61, and It has a box shape constituted by a pair of side surface portions 62 that are continuous on both sides.

Further, the seat bracket 6 has a bottom surface portion 63 that continues to the lower end of the inclined surface 61 and is joined to the upper surface portion 40 of the floor cross member 4 , and side portions that continue to both sides of the bottom portion 63 and are joined to the side upper portions 44 of the floor cross member 4 . It has a lower portion 64 of 62, a mounting portion 60 and a flange portion 65 extending from the edge of the side portion 62 and joined to the side surface 26 of the floor tunnel 2. As shown in FIG.

Next, the operation based on the above embodiment will be described with reference to FIG.

As shown in FIG. 5 , when an impact load is input from the side of the vehicle due to a side collision or the like, an axial load F is input from one end 47 of the floor cross member 4 via the side sill 1 .

At this time, as shown in FIG. 5B, in addition to the cross section of the floor cross member 4 expanding at the one end portion 47 side, the side surface portion 41 of the floor cross member 4 extends in the axial direction. Since the stepped portion 42 is formed, the effective width (Karman's effective width) is increased, the resistance to the axial compressive load F of the floor cross member 4 is improved, and an effect of suppressing deformation can be expected.

On the other hand, the component force of the axial load F input from the side of the vehicle body passes through the bottom portion 53 of the seat bracket 5, the first inclined surface 51, the mounting portion 50, the second inclined surface 52, and the bottom portion 54. , is also input as a downward bending load Fd from the vicinity of the bottom surface portion 54 . At this time, the load input from the seat or the like attached to the seat bracket 5 via the attachment portion 50 and the second inclined surface 52 also acts as the bending load Fd.

Conversely speaking, the fact that the cross section of the floor cross member 4 expands on the side of the one end 47 means that the cross section shrinks as the distance from the side of the one end 47 increases. As shown, in the vicinity of the bottom portion 54, a force component Fx is generated in the direction of widening the side portion 41 of the floor cross member 4. As shown in FIG.

However, when the downward bending load Fd is input from the vicinity of the bottom surface portion 54 as described above, the side surface portion 41 of the floor cross member 4 is compressed inward as indicated by reference numeral 41' in FIG. 5(c). The force component Fc is generated to offset the above-described force component Fx in the direction of widening the side surface portion 41 , and the effect of suppressing the deformation of the floor cross member 4 can also be expected by this action.

As described above, while the effect of improving resistance to the axial compressive load F is obtained by enlarging the cross section on the side of the one end 47 and increasing the effective width of the stepped portion 42, the distance between the flange portion 5, which is the joint portion to the floor panel 10, is increased by the floor. Since it is constant over the entire length of the cross member 4 and there is no need to change the shape of the one end 47, there is no need to change the design of the joints on the vehicle body side, such as the floor panel 10 or the side sill 1, and increase the production cost associated therewith. can be avoided.

For example, in order to improve surface rigidity, the floor panel 10 is formed with bulging portions and beads avoiding the joints of the floor cross member 4, but the joints of the floor cross member 4 (flanges 45) are Since the floor panel 10 is parallel to the vehicle width direction W and has a constant width, the shape layout of the floor panel 10 is not complicated, and the versatility as a vehicle body part is not impaired.

Although the floor cross member 4 of the above-described embodiment has the reduced-width section 42a of the stepped portion 42 in the area where the seat bracket 5 is installed, the reduced-width section 42a is wider than the area where the seat bracket 5 is installed. It may reach the other end 46 side.

Further, the starting point of the reduced-width section 42 a may be one end portion 47 of the floor cross member 4 or an intermediate portion between the side portions 55 and 56 of the seat bracket 5 . Furthermore, a reduced width section may be provided in which the width of the step portion 42 decreases toward the other end portion 46 side.

In the above-described embodiment, the seat bracket 5 is formed in a trapezoidal shape or an inverted V shape including the pair of inclined surfaces 51 and 52. can also be configured as a bracket for Also, the seat bracket 6 can be configured as a trapezoidal or inverted V-shaped bracket like the seat bracket 5 .

Also, the seat bracket 6 may be provided separately from the floor cross member 4 , and the floor cross member ASSY (aggregate) may be configured only with the floor cross member 4 and the seat bracket 5 .

Although several embodiments of the present invention have been described above, it should be noted that the present invention is not limited to the above-described embodiments, and that various modifications and changes are possible based on the technical idea of the present invention. I will add.

1 side sill 2 floor tunnel 3 floor side member 4 floor cross member (cross member)
5, 6 seat bracket (bracket)
10 Floor panel 40 Upper surface 41 Side surface 42 Stepped portion 42a Reduced width section 43 Side lower portion 44 Side upper portion 45 Flange portion 50 Mounting portion 51 First inclined surface (leg portion)
52 second inclined surface (leg)
53, 54 bottom part 55, 56 side part

Claims (6)

A vehicle body part for a cross member to be joined to a floor panel of a vehicle body, comprising:
a top surface portion extending in the longitudinal direction; a pair of side portions extending downward continuously on both sides of the top surface portion and extending in the axial direction; and a pair of flange portions extending in the axial direction,
The distance between the pair of flange portions is uniform over the entire axial direction,
The pair of side surface portions has a step portion extending in the axial direction at an intermediate portion in the height direction, includes an upper side portion and a lower side portion separated by the step portion, and has a width of the step portion. includes a narrowed width section that gradually narrows toward one end side in the axial direction, and the width of the upper surface portion and the distance between the pair of side surface portions at the upper portion of the side surface is equal to the narrowed width section in the axial direction. A body part, gradually expanding in the corresponding section. A vehicle body parts assembly comprising a cross member made of the vehicle body part according to claim 1 and a bracket joined adjacent to the one end side of the cross member,
The assembly of vehicle body parts, wherein the bracket includes a leg extending upward from the upper surface of the cross member, and a mounting part for another part positioned at the upper end of the leg. The leg portion of the bracket includes a first inclined surface located on the one end side of the cross member and a second inclined surface located on the opposite side to the one end side with respect to the mounting portion. 3. The first and second inclined surfaces have an inclination such that the interval between the lower ends of the cross member joined to the upper surface portion is wider than the interval between the upper ends that are continuous with the mounting portion. 3. The body part assembly according to 2. The first slanted surface and the second slanted surface of the bracket are joined to the upper side surface of the cross member continuously on both sides of the bottom surface portion joined to the top surface portion of the cross member. 4. A vehicle body part assembly according to claim 3, comprising a side portion. The narrowed section of the width of the stepped portion of the cross member extends from or near one end in the axial direction to the axial section including the first inclined surface and the second inclined surface of the bracket. 5. The vehicle body part assembly according to claim 3 , which extends. The vehicle body parts assembly according to any one of claims 2 to 5, wherein the longitudinal axis of the cross member is oriented in the vehicle width direction and joined to the floor panel at the pair of flange portions, and the axis of the cross member is A vehicle body structure that is joined to a vehicle body frame extending in the vehicle length direction at one end in the direction and joined to a side surface of a floor tunnel at the other end in the axial direction.

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