JP5951455B2 - Body frame collision safety structure - Google Patents

Description

  The present invention relates to a collision safety structure for a body frame.

  As shown in FIG. 8, the body frame 41 of the pickup truck and the multipurpose passenger vehicle generally has a structure that is largely offset from the vehicle structure immediately after the front tire and in the vicinity of the second cab mount (riding portion). In the vehicle body frame 41 having such a structure, the strength of the offset frame 8 tends to be insufficient, and if the reinforcement thereof is insufficient, the offset frame 8 may be bent at the time of a vehicle collision, which may impair collision safety.

  Particularly in an offset collision, the collision energy must be borne by the side member 3 on one side, so that the side member 3 may be greatly bent as shown in FIG. 9, which may impair the safety of the passenger.

  In order to suppress the bending of the offset frame 8, it is common to use a method such as adding reinforcement to the side members 2 and 3, adding a gusset to the cross member joint, or adding a brace bar, alone or in combination. .

  In particular, the brace bar is widely used as an effective means because it serves as a support rod for the bent portion. As shown in FIG. 10 (a), the brace bar 42 is generally extended obliquely inward from the inner or lower surface of the side members 2 and 3 and attached to the mission cross member 5 that supports the mission. is there.

  However, in this structure, a large force is applied to the center portion of the mission cross member 5 and it is necessary to suppress buckling of this portion. Therefore, the mission cross member 5 needs to have a strong structure.

  Each of these structures has a problem that the cost and weight increase in order to strengthen the frame.

  Further, as shown in FIG. 10 (b), a support rod-shaped brace bar extending from the right side member 3 to the left side of the mission cross member 5 and from the left side member 2 to the right side of the mission cross member 5, respectively. There is also an X-shaped type in which 43 and 44 are provided to cross each other. Since this structure is attached to the base of the mission cross member 5, it is not necessary to make the mission cross member 5 strong and can be made relatively light.

JP 2010-184598 A Japanese Patent Laid-Open No. 10-181631

  However, when the two brace bars 43 and 44 are provided apart from each other in the vertical direction, there is an engine on the upper side, and a certain amount of clearance from the road surface needs to be secured on the lower side. Furthermore, since the bending directions of the left and right members are different, there is a possibility that a difference occurs in the left and right collision safety.

  In addition, when the two brace bars 43 and 44 are separated from each other up and down and are made to be an integral structure that crosses the left and right symmetrically in an X shape, the intersecting portion 45 has a structure in which the brace bars 43 and 44 intersect each other. Since it becomes a knot and becomes weak, there is a problem that it is easy to buckle at the intersection 45.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a vehicle body frame collision safety structure capable of overcoming the above problems and achieving high collision safety performance at a low weight and at a low cost.

  In order to solve the above-mentioned problems, the present invention is a vehicle frame having a narrow rear frame through an offset frame widened from the front frame with a narrow front frame facing the front in the traveling direction. In a vehicle body frame collision safety structure in which a reinforcing member made by crossing steel materials in an X shape is provided on an offset frame between a front frame and a rear frame, the reinforcing member is raised from both a horizontal web and both sides of the web. A steel material formed by a flange is used and formed by a divided reinforcing member having a length divided into four at the intersecting portion, and a tip portion forming the intersecting portion of the divided reinforcing member is cut out in a bowl shape, and they are opposed to each other. While the web of the divided reinforcing member has a notch portion and a convex piece portion, the notch portion and the convex piece portion facing each other face each other, and the left and right flanges face each other. Formed so as to sandwich the flange that intersect between the further step portion is formed in the convex piece, the stepped portion of the protruding piece of the web crossing is obtained by forming so as to overlap each other.

  According to the present invention, high collision safety performance can be achieved with light weight and low cost.

It is a top view which shows the principal part of the vehicle body frame which concerns on this Embodiment. It is a principal part expansion perspective view of the reinforcement member of FIG. It is a principal part expansion perspective view of the division | segmentation reinforcement member which comprises the reinforcement member of FIG. (A) is a top view of a reinforcement member, (b) is a top view of the division | segmentation reinforcement member before an assembly | attachment. (A) is a plan view of the divided reinforcing member, (b) is a rear view of (a) viewed from the left direction, (c) is a side view of (a) viewed from below, d) It is the side view which looked at (a) from the upper direction. It is a principal part expansion perspective view of the division | segmentation reinforcement member before welding. Other embodiment is shown, (a) is a top view of a reinforcement member, (b) is a top view of the division | segmentation reinforcement member before an assembly | attachment. It is a top view which shows an example of the vehicle body frame which is not reinforced. It is a plane explanatory view explaining the shape change before and after the offset collision of the body frame. An example of the conventional reinforcement structure is shown, (a) is a plan view of a type where the brace bars do not intersect, and (b) is a plan view of a type where the brace bars intersect.

  A vehicle body frame collision safety structure according to the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the body frame 1 includes side members 2 and 3 disposed on the left and right sides with respect to the vehicle traveling direction, and a cross provided between the side members 2 so as to connect the side members 2 and 3. It consists of a chassis frame 6 having members 4 and 5.

  The chassis frame 6 is formed on the front side of the vehicle facing forward in the traveling direction and is positioned between the front tires (not shown), and is formed to extend rearward from the front frame 7 and from the front frame 7. It has an offset frame 8 that widens toward the rear, and a rear frame 9 that extends rearward from the offset frame 8.

  The front frame 7 is formed narrower than the rear frame 9 because the front tire requires a cutting angle.

  The offset frame 8 is provided with a reinforcing member 10 made by crossing steel materials in an X shape so as to be detachable using fastening members (not shown) such as bolts and nuts.

  As shown in FIG. 4B, the reinforcing member 10 is composed of the divided reinforcing members 11 having a length divided into four at the intersection 14, and all are formed in the same shape. Moreover, as shown in FIG. 2, the four division | segmentation reinforcement members 11 are welded mutually and are united.

  The divided reinforcing member 11 before welding will be described.

  As shown in FIGS. 3, 4, 5, and 6, the split reinforcing member 11 is made of steel, and includes a horizontal web 12 and flanges 13 rising from both sides of the web 12. The web 12 and the flanges 13 on both sides are connected by a curved surface.

  In addition, the split reinforcing member 11 has a front end portion 15 forming the intersecting portion 14 cut out in a hook shape. Specifically, the distal end portion 15 of the divided reinforcing member 11 has a flange 13 on one side and a web 12 that are notched over a predetermined width and a predetermined length. A notch portion 16 is formed on one side and a convex piece portion 17 is formed on the other side. The predetermined width is a width slightly exceeding half of the width W of the reinforcing member 10. Thereby, when the front-end | tip parts 15 of the division | segmentation reinforcement member 11 are made to oppose, when the convex piece parts 17 of the web 12 spaces apart and the four division | segmentation reinforcement members 11 are assembled | attached and the reinforcement member 10 is formed, a reinforcement member A quadrangular hole 18 is formed at the center of the ten intersecting portions 14. By setting and assembling jig pins (not shown) in the holes 18, the four divided reinforcing members 11 can be easily positioned when set on a jig (not shown). The predetermined length A is a length obtained by subtracting the plate thickness T of the flange 13 from the width W (A = WT). Thereby, the flanges 13 of the divided reinforcing members 11 facing each other are continuous via the flanges 13 of the divided reinforcing members 11 intersecting each other. The flange 13 and the web 12 are formed to have the same plate thickness T.

  Further, a stepped portion 19 is formed in the convex piece portion 17 so as to overlap the web 12 of the intersecting divided reinforcing members 11. The stepped portion 19 is formed by bending the convex piece portion 17 so that the distal end side of the convex piece portion 17 of the web 12 is higher than the base end side by the plate thickness, and the divided reinforcing member that intersects the convex piece portion 17. 11 on the base end 20 of the convex piece 17. Accordingly, the webs 12 are prevented from interfering with each other, and the thickness of the crossing portion 14 is increased.

  Furthermore, an extended step portion 21 is formed on the base end side of the convex piece portion 17 so as to overlap the web 12 on the cutout portion 16 side of the intersecting divided reinforcing member 11. The extended step portion 21 is formed by bending the convex piece portion 17 so that the flange side web 12 on the base end side of the convex piece portion 17 is higher than the notch portion 16 side web 12 on the base end side of the convex piece portion 17 by the plate thickness. Is formed. Further, the extended step portion 21 is formed so as to extend from the step portion 19 to the base end side.

  Further, escape notches 22 and 23 for avoiding interference with the intersecting divided reinforcing member 11 are formed at the tip 15 of the divided reinforcing member 11 where the web 12 and the flange 13 are connected.

  5, R is the radius of the curved surface connecting the web 12 and the flange 13, K1 is the height of the relief notch 23 on the convex piece 17 side, and K2 is the height of the relief notch 23. It is the length before and after. The height K1 and the length K2 are set to be equal dimensions, and are set slightly larger than the radius R (K1 = K2 = (R + α)). J is the difference between the bottom surface height of the base end portion 20 and the stepped portion 19 and is set to the same dimension as the plate thickness T (J = T).

  Next, the operation of this embodiment will be described.

  When the reinforcing member 10 is formed by assembling the four divided reinforcing members 11, a jig pin formed in the same cross-sectional shape and the same size as the hole 18 is erected vertically, and the four divided parts are centered on the jig pin. The reinforcing members 11 are arranged in an X shape, and are arranged so that the notched portions 16 side of the convex piece portions 17 of the respective divided reinforcing members 11 are in contact with the outer periphery of the jig pin.

  Thereafter, as shown in FIG. 4 (b), the divided reinforcing members 11 are moved and combined so that the notched portions 16 and the convex piece portions 17 of the opposing divided reinforcing members 11 face each other, and the left and right flanges are combined. The split reinforcing members 11 are combined so that the flanges 13 intersecting each other and sandwiching the flanges 13 therebetween. At this time, the base end portion 20 of the convex piece portion 17 of the web 12 and the stepped portion 19 of the convex piece portion 17 of the intersecting web 12 are combined so as to overlap each other.

  When the four divided reinforcing members 11 are assembled as shown in FIGS. 4A and 6 in this way, the divided reinforcing members 11 are welded to each other at the intersection 14. Specifically, at the intersecting portion 14, the convex piece portions 17 overlap with each other in a bowl shape, and hence are welded in a bowl shape along the edge of each convex piece portion 17. Moreover, the front-end | tip of each flange 13 is welded to the flange 13 of the other division | segmentation reinforcement member 11 with which the front-end | tip of the flange 13 abuts. Specifically, the tip of the notched flange 13 is welded to the outer surface 24 of the flange 13 of the intersecting divided reinforcing member 11 and the tip of the opposite flange 13 is welded to the intersecting divided reinforcing member 11. Welding to the inner surface 25 of the flange 13. Thereby, as shown in FIG. 2, the X-shaped reinforcement member 10 is formed. The opposing flanges 13 are integrated with each other via the flanges 13 of the intersecting divided reinforcing members 11 and are continuous, and are strong against the force in the flange extending direction. Moreover, the plate | board thickness of the web 12 of the cross | intersection part 14 is doubled, and becomes a firm surface.

  In this way, the reinforcing member 10 is formed of the divided reinforcing member 11 having a length divided into four at the intersection 14 while using a steel material formed by the horizontal web 12 and the flange 13 rising from both sides of the web 12. Then, the front end portion 15 forming the intersecting portion 14 of the divided reinforcing member 11 is notched in a bowl shape, and the web 12 of the divided reinforcing member 11 facing the cutout portion 16 and the convex piece portion 17 and the facing notched portion. 16 and the convex piece part 17 are formed so that the left and right flanges 13 face each other and the flange 13 that intersects between them is sandwiched, and further, a step part 19 is formed on the convex piece part 17, Since the step portions 19 of the projecting piece portions 17 of the intersecting webs 12 overlap each other, the portion of the reinforcing member 10 extending from the right front to the left rear and the reinforcing member 10 extending from the left front to the right rear are provided. The same height can be achieved for both offset collisions on the left and right sides of the vehicle body, and the same performance can be provided with the same structure on both the right and left steering wheels. There is no need to use the reinforcing member 10 properly. In addition, since each flange 13 is constituted by one surface without interruption, even if an impact at the time of a vehicle collision is applied in the member compression direction, the collision energy can be easily transmitted without buckling, and high collision safety is achieved. Sex can be obtained. And the buckling in the cross | intersection part 14 can be prevented and high collision safety performance can be achieved. Moreover, it can be made cheaper and lighter than a structure that reinforces the frame itself.

  Moreover, since the division | segmentation reinforcement member 11 which opposes shall be formed so that the convex piece parts 17 of the web 12 may space apart, and shall form the square hole 18 in the center of the cross | intersection part 14 of the reinforcement member 10, a jig | tool pin The split reinforcing member 11 can be easily assembled using In use, it is possible to prevent drainage such as rainwater that has entered the intersection 14 from passing through the holes 18 and collecting drainage at the intersection 14.

  In addition, since the divided reinforcing members 11 are all formed in the same shape, the divided reinforcing members 11 can be processed with the same mold, and the mold cost can be suppressed and manufactured at low cost. Further, it is not necessary to manage a plurality of types of members, and member management can be facilitated.

  The step portion 19 is formed on the distal end side of the convex piece portion 17 of the web 12, and the convex piece portion 17 so as to overlap the base end side of the convex piece portion 17 of the divided reinforcing member 11 intersecting the convex piece portion 17. Since the split reinforcing member 11 can be formed in a simple shape, scrap when punching a plate to be the split reinforcing member 11 from the plate material can be reduced, the yield is good, and the material cost is kept low. be able to. In addition, press molding can be easily performed and the number of processing steps can be reduced, so that the processing cost can be reduced. In addition, since press molding is easy, even a high-tensile material (high-strength material) with a large spring back can be easily processed, and the buckling strength can be improved.

  In addition, an extended step portion 21 that overlaps the web 12 on the side of the cutout portion 16 of the intersecting divided reinforcing member 11 is formed by bending the convex piece portion 17 on the base end side of the convex piece portion 17 of the web 12. Therefore, the web 12 outside the intersection 14 can be doubled, and can be doubled in a wide area, and the strength of the intersection 14 can be further increased.

  The present invention is not limited to the embodiment described above.

  The reinforcing member 10 has been described as a combination of the divided reinforcing members 11 having a U-shaped cross section with the upper side open. A direction that is difficult to break may be selected in accordance with the deformation mode at the time of a vehicle collision. The same effect can be exhibited.

  In addition, a lid (not shown) may be provided on the reinforcing member 10 so as to close the opening of the U-shaped cross section, thereby forming a square closed cross-sectional structure. Even if it becomes a closed section structure, since the continuous flange 13 is formed in the crossing part 14, it can strengthen further, without impairing collision safety.

  Further, although the case where the vehicle body frame 1 is the chassis frame 6 has been described, the above-described reinforcing member 10 can also be applied to a vehicle body without a chassis frame, such as a vehicle body frame having an engine subframe or a monocoque body. . Also in this case, high collision safety can be obtained.

  Further, the reinforcing member 10 has an intersection angle of 90 degrees, and the divided reinforcing members 11 have the same tip shape. However, as shown in FIG. You may set to the crossing angle. In this case, as shown in FIG. 7B, two types of split reinforcing members 31 and 32 are required, but the left and right flange positions and the shape of the convex piece portions 33 and 34 are set according to the crossing angle. It is good to adjust appropriately. Similar effects can be obtained.

DESCRIPTION OF SYMBOLS 1 Body frame 2 Side member 3 Side member 4 Cross member 5 Cross member 6 Chassis frame 7 Front frame 8 Offset frame 9 Rear frame 10 Reinforcement member 11 Split reinforcement member 12 Web 13 Flange 14 Intersection 15 Tip part 16 Notch part 17 Convex Piece 18 Hole 19 Stepped portion 20 Base end portion 21 Extended stepped portion 22 Relief cutout portion 23 Relief cutout portion 24 Outer surface 25 Inner surface

Claims (5)

A vehicle body frame having a wide rear frame through an offset frame widened from the front frame with a narrow front frame facing the front in the traveling direction, and an offset between the front frame and the rear frame In the collision safety structure of a vehicle body frame in which a reinforcing member made by crossing steel materials in an X shape is provided on the frame,
The reinforcing member is formed of a divided reinforcing member having a length divided into four at a crossing portion using a steel material formed by a horizontal web and flanges rising from both sides of the web, and the crossing portion of the split reinforcing member And the right and left flanges so that the web of the divided reinforcing member facing the notch has a notch and a projecting piece and the facing notch and the projecting piece meet each other. It is formed so that the flanges that face each other and sandwich the intersecting flanges are formed, and further, a step portion is formed on the convex piece portion, and the step portions of the convex piece portions of the intersecting web are formed to overlap each other. The body frame collision safety structure.   The collision of the vehicle body frame according to claim 1, wherein the divided reinforcing members facing each other are formed so that the convex pieces of the web are separated from each other to form a square hole at the center of the intersection of the reinforcing members. Safety structure.   The collision safety structure for a vehicle body frame according to claim 1 or 2, wherein all of the divided reinforcing members are formed in the same shape.   The step portion is formed on the distal end side of the convex piece portion of the web and is formed by bending the convex piece portion so as to overlap the proximal end side of the convex piece portion of the divided reinforcing member that intersects the convex piece portion. The collision safety structure for a vehicle body frame according to any one of claims 1 to 3.   5. The collision of the vehicle body frame according to claim 4, wherein an extended stepped portion overlapping the web on the notch portion side of the intersecting divided reinforcing member is formed on the proximal end side of the convex piece portion of the web by bending the convex piece portion. Safety structure.