JP2016043707A - Cross member for vehicle body frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cross member for a vehicle body frame which is adapted to vehicle body frames having a variety of widths by one kind of a part, and reduced in cost.SOLUTION: A cross member 1 for a vehicle body frame which is attached between a pair of side rails 2a, 2b arranged in a vehicle width direction at an interval comprises a first member 6a fixed to one side rail 2a, and a second member 6b fixed to the other side rail 2b. The first member 6a and the second member 6b have superimposed parts 10a, 10b which are slidably superimposed on each other in the vehicle width direction, and fixed parts 11a, 11b fixed to the side rails 2a, 2b, respectively, and the superimposed part 10a of the first member 6a and the fixed part 11a, and the superimposed part 10b and the fixed part 11b of the second member 6b are point-symmetric with respect to a vehicle center axis C which extends to a vehicle body fore-and-aft direction.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a cross member for a vehicle body frame that constitutes a vehicle body frame together with side rails, and more particularly, a cross member for a vehicle body frame that can cope with a vehicle body frame of various widths with a single type of component and that achieves cost reduction. About.

  As shown in FIG. 1, a vehicle body frame F of a vehicle such as a truck or a bus is disposed between a pair of side rails 2a and 2b arranged at intervals in the vehicle width direction and the side rails 2a and 2b. A so-called ladder frame (ladder frame) having a cross member 1x is known (see Patent Document 1).

  The side rails 2a and 2b include webs 3a and 3b formed along the vehicle length direction, upper flanges 4a and 4b bent 90 degrees from the upper ends of the webs 3a and 3b, and 90 degrees from the lower ends of the webs 3a and 3b. The bent lower flanges 5a and 5b are formed in a U shape in cross section, and a pair is arranged at intervals in the vehicle width direction so that the insides of the U shapes face each other. On the other hand, the cross member 1x includes a web 7x formed along the vehicle width direction, an upper flange 8x bent 90 degrees from the upper end of the web 7x, and a lower flange 9x bent 90 degrees from the lower end of the web 7x. It has a U-shaped cross section by pressing a material plate. A plurality of cross members 1x are disposed between the left and right side rails 2a, 2b at intervals in the vehicle length direction, and FIG. 1 shows an end cross member disposed at the rearmost end in the vehicle length direction.

  Conventionally, in this type of vehicle body frame F (ladder frame), cross members 1x having different dimensions and product numbers are used for each vehicle type in which the distance between the left and right side rails 2a and 2b is different. Further, even in the same vehicle body frame F of a single vehicle type, there are vehicle body frames in which the distance between the left and right side rails 2a and 2b varies depending on the position in the vehicle length direction. The cross member 1x having a different size and part number was used depending on the position.

JP-A-2005-132200

  For this reason, the product number (type) of the cross member 1x is increased, and parts management is complicated. Further, in order to manufacture the cross member 1x, it is necessary to prepare a press die for each product number, and the investment has been increased.

  SUMMARY OF THE INVENTION An object of the present invention, which was created in view of the above circumstances, is to provide a cross member for a vehicle body frame that can cope with a vehicle body frame of various widths with a single type of part and that is reduced in cost.

  According to the present invention created to achieve the above-described object, a cross member for a vehicle body frame mounted between a pair of side rails arranged at intervals in the vehicle width direction, A first member fixed to one of the rails and a second member fixed to the other of the pair of side rails are provided, and the first member and the second member are slidably overlapped in the vehicle width direction. The overlapping portion and the fixing portion fixed to the side rail are respectively configured, and the overlapping portion and the fixing portion of the first member and the overlapping portion and the fixing portion of the second member are arranged on the vehicle central axis extending in the vehicle longitudinal direction. A cross member for a vehicle body frame characterized in that it is point-symmetric with respect to it is provided.

  In the cross member for the vehicle body frame, the overlapping portion has a joggle portion having a step according to the plate thickness of the fixing portion, and a part of the surface that is flush with the fixing portion, and the first member The joggle part and the surface part of the second member and the joggle part and the surface part of the second member are point-symmetric with respect to the vehicle center axis, and the joggle part of the first member is overlapped with a part of the surface of the second member, The joggle part of the second member may overlap the part of the surface of the first member, and the fixing part of the first member and the fixing part of the second member may be flush with each other.

  The cross member for the vehicle body frame is formed point-symmetrically with respect to the vehicle center axis at the inner end in the vehicle width direction of the overlapping portion of the first member and the inner end in the vehicle width direction of the overlapping portion of the second member. A notch portion is provided, and an inclined portion connecting the joggle portion of the first member and a part of the surface and an inclined portion connecting the joggle portion of the second member and a portion of the surface are points with respect to the vehicle center axis. It is symmetrical, and the one end part in the longitudinal direction of the inclined part of the first member and the one end part in the longitudinal direction of the inclined part of the second member may be respectively located in the notch part.

  In the cross member for the vehicle body frame, the joggle part of the first member is overlapped with a part of the surface of the second member, the joggle part of the second member is overlapped with a part of the surface of the first member, A hole may be formed by the notch and the notch of the second member.

  In the cross member for the vehicle body frame, connecting holes for connecting the first member and the second member are formed in the overlapping portion of the first member and the overlapping portion of the second member, respectively. It has long holes and round holes formed along the width direction, and the long holes and round holes of the first member and the long holes and round holes of the second member are point-symmetric with respect to the vehicle center axis. When the overlapping portion of the first member and the overlapping portion of the second member are overlapped, the long hole of the first member overlaps the round hole of the second member, and the long hole of the second member is the round hole of the first member. The fastener may be inserted into the overlapping and overlapping holes, and the first member and the second member may be connected.

  Further, according to the present invention, there is provided a cross member for a vehicle body frame that is mounted between a pair of side rails that are spaced apart in the vehicle width direction, and is disposed in an upper portion between the pair of side rails. An upper member and a lower member disposed in a lower portion between the pair of side rails, and the upper member and the lower member are overlapped in a vertically slidable manner, The upper portion overlapped portion and the fixed portion and the lower portion overlapped portion and the fixed portion are point-symmetric with respect to the vehicle center axis extending in the longitudinal direction of the vehicle body. A cross member for a vehicle body frame is provided.

  In the cross member for the vehicle body frame, the overlapping portion has a joggle portion having a step according to the plate thickness of the fixing portion, and a part of the surface that is flush with the fixing portion. The joggle part and part of the surface and the joggle part and part of the surface of the lower member are point-symmetric with respect to the vehicle center axis, and the joggle part of the upper member is overlapped with part of the surface of the lower member, The joggle part of the member may be overlapped with a part of the surface of the upper member, and the fixing part of the upper member and the fixing part of the lower member may be flush with each other.

  In the cross member for the vehicle body frame, the lower end of the overlapped portion of the upper member and the upper end of the overlapped portion of the lower member are each provided with a notch formed symmetrically with respect to the vehicle center axis. The inclined part connecting the joggle part of the member and a part of the surface and the inclined part connecting the joggle part of the lower member and the part of the surface are point symmetric with respect to the vehicle center axis, and the inclined part of the upper member One end portion in the longitudinal direction and one end portion in the longitudinal direction of the inclined portion of the lower member may be respectively located in the cutout portion.

  In the cross member for the vehicle body frame, the joggle portion of the upper member is overlapped with a part of the surface of the lower member, the joggle portion of the lower member is overlapped with a part of the surface of the upper member, A hole may be formed by the cutout portion of the lower member.

  In the cross member for the vehicle body frame, a connecting hole for connecting the upper member and the lower member is formed in the overlapping portion of the upper member and the overlapping portion of the lower member, respectively. A long hole and a round hole formed along the upper member. The long hole and the round hole of the upper member and the long hole and the round hole of the lower member are symmetrical with respect to the vehicle center axis. When the overlapping portion and the overlapping portion of the lower member are overlapped, the long hole of the upper member overlaps the round hole of the lower member, the long hole of the lower member overlaps the round hole of the upper member, and the overlapping hole A fastener may be inserted and the upper member and the lower member may be connected.

  According to the cross member for a vehicle body frame according to the present invention, the first member fixed to one of the pair of side rails and the second member fixed to the other are formed point-symmetrically with respect to the vehicle center axis. By superposing the first member and the second member so as to be slidable in the vehicle width direction, it is possible to cope with body frames of various widths with a single type of component, and to reduce costs.

  Further, the upper member fixed to the upper portion between the pair of side rails and the lower member fixed to the lower portion are formed point-symmetrically with respect to the vehicle center axis, and the upper member and the lower member are formed. By superimposing in a vertically slidable manner, it is possible to cope with body frames of various heights with a single type of component, thereby reducing costs.

It is a perspective view of the cross member for body frames which shows a prior art example. 1 is a perspective view of a cross member for a vehicle body frame showing a first embodiment of the present invention. It is a disassembled perspective view of the cross member which concerns on the said embodiment. It is explanatory drawing of the cross member which concerns on the said embodiment, (a1) is a front view of the 1st member, (b1) is a top view of the same member, (c1) is a bottom view of the same member, (d1) is the same member (A2) is a front view of the second member, (b2) is a plan view of the member, (c2) is a bottom view of the member, and (d2) is a side view of the member. It is explanatory drawing which shows a mode that the cross member which concerns on the said embodiment was expanded-contracted, (a) is a top view of the contracted state, (b) is a front view of the same state, (c) is a top view of the extended state (D) is a front view of the same state. It is explanatory drawing which shows the modification 1 which carried out the fillet welding of the 1st member and 2nd member of the said cross member, (a) is a perspective view, (b) is a top view, (c) is a front view. It is explanatory drawing which shows the modification 2 which carried out the spot welding of the 1st member and 2nd member of the said cross member, (a) is a perspective view, (b) is a top view, (c) is a front view. It is a perspective view which shows the modification 3 which fixed the said cross member to the web of the side rail. It is explanatory drawing which shows the modification 4 of the joggle part of the said cross member, (a) is the front view which enlarged the joggle part, (b) is the front view which made the jogle part small, (c) is further smaller than the joggle part. FIG. It is explanatory drawing of the cross member for vehicle body frames which concerns on 2nd Embodiment of this invention, (a) superimposes an upper member and a lower member so that it can slide to an up-down direction so that a dimension difference of an up-down direction may be coped with. FIG. 6B is a perspective view of the cross member, and FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiment are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

(First embodiment)
A cross member 1 for a vehicle body frame according to a first embodiment of the present invention will be described with reference to FIGS. 2, 3, 4, and 5. As shown in FIG. 2, the cross member 1 for a vehicle body frame according to the present embodiment is mounted between a pair of side rails 2a and 2b arranged at intervals in the vehicle width direction. A vehicle body frame F is configured together with the rails 2a and 2b.

  As shown in FIG. 2, one side rail 2a includes a web 3a formed along the vehicle length direction, an upper flange 4a bent 90 degrees from the upper end of the web 3a, and 90 degrees bent from the lower end of the web 3a. The lower flange 5a is formed in a U-shaped cross section. Similarly, the other side rail 2b is formed in a U-shaped cross section from the web 3b, the upper flange 4b, and the lower flange 5b. A pair of these side rails 2a, 2b are arranged at intervals in the vehicle width direction so that the inside of the U-shape faces each other.

  A plurality of cross members 1 are disposed between the left and right side rails 2a, 2b at intervals in the vehicle length direction. As shown in FIG. 2, the cross member 1 according to the present embodiment is an end cross member attached to the rear end of the side rail 2 in the vehicle length direction, but the present invention is not limited to the end cross member. The cross member 1 according to the present embodiment includes a first member 6a fixed to one side rail 2a and a second member 6b fixed to the other side rail 2b.

  As shown in FIG. 3, the first member 6a includes a web 7a formed along the vehicle width direction, an upper flange 8a bent 90 degrees from the upper end of the web 7a, and 90 degrees bent from the lower end of the web 7a. And a lower flange 9a, and is formed into a U-shaped cross section by pressing a material plate. Similarly to the first member 6a, the second member 6b is also formed in a U-shaped cross section from the web 7b, the upper flange 8b, and the lower flange 9b.

  As shown in FIG. 4, the 1st member 6a is comprised from the superposition | polymerization 10a part slidably superimposed on the vehicle width direction, and the fixing | fixed part 11a fixed to the side rail 2a. Similarly, the second member includes the overlapping portion 10b and the fixing portion 11b. The overlapping portions 10a and 10b are disposed inward in the vehicle width direction, and the fixing portions 11a and 11b are disposed outward in the vehicle width direction, and are adjacent to each other in the vehicle width direction. In a state where the overlapping portion 10a of the first member 6a is overlapped with the overlapping portion 10b of the second member 6b, the fixing portion 11a of the first member 6a is fixed to one side rail 2a, and the fixing portion 11b of the second member 6b. Is fixed to the other side rail 2b.

  The overlapping portion 10a and the fixing portion 11a of the first member 6a and the overlapping portion 10b and the fixing portion 11b of the second member 6b are point-symmetric (180-degree rotational symmetry) with respect to the vehicle center axis C extending in the longitudinal direction of the vehicle body. Molded. Thereby, the 1st member 6a and the 2nd member 6b become the same shape including various parts mentioned below. For example, the upper flange 8a of the first member 6a and the lower flange 9b of the second member 6b have the same shape, and the lower flange 9a of the first member 6a and the upper flange 8b of the second member 6b have the same shape. The vehicle center axis C is located in the center in the width direction and in the center in the height direction between the left and right side rails 2a and 2b.

  As shown in FIGS. 2 to 4, an attachment hole 12 a for fixing the first member 6 a to one side rail 2 a is formed in the fixing portion 11 a of the first member 6 a. The mounting hole 12a is formed in the upper flange 8a and the lower flange 9a of the fixed portion 11a of the first member 6a, and a fastener (bolt nut, rivet, etc.) inserted through the mounting hole 12a is connected to one side rail 2a. The upper flange 4a and the lower flange 5b are fixed. Similarly, mounting holes 12b for fixing the second member 6b to the other side rail 2b are also formed in the upper flange 8b and the lower flange 9b of the fixing portion 11b of the second member 6b. The mounting hole 12a of the first member 6a and the mounting hole 12b of the second member 6b are formed point-symmetrically with respect to the vehicle center axis C.

  As shown in FIG. 4, the overlapping portions 10a of the first member 6a and the overlapping portions 10b of the second member 6b have connecting holes 13a and 13b for connecting the first member 6a and the second member 6b, respectively. Is formed. The connecting hole 13a of the first member 6a is formed in the upper flange 8a and the lower flange 9a of the overlapping portion 10a of the first member 6a, and the connecting hole 13b of the second member 6b is the upper portion of the overlapping portion 10b of the second member 6b. It is formed in the flange 8b and the lower flange 9b. The connecting hole 13a has a long hole 14a formed along the vehicle width direction and a round hole 15a formed on the extension line. Similarly, the connecting hole 13b has a long hole 14b and a round hole 15b. In the present embodiment, two sets of the long holes 14a (14b) and the round holes 15a (15b) are provided at intervals in the vehicle length direction, but one set may be used. The connection hole 13a (long hole 14a, round hole 15a) of the first member 6a and the connection hole 13b (long hole 14b, round hole 15b) of the second member 6b are formed point-symmetrically with respect to the vehicle center axis C. ing.

  When the overlapping portion 10a of the first member 6a and the overlapping portion 10b of the second member 6b shown in FIG. 4 are overlapped, the long hole 14a of the first member 6a overlaps the round hole 15b of the second member 6b, and the second The long hole 14b of the member 6b overlaps the round hole 15a of the first member 6a. As shown in FIG. 2, a fastener 16 (bolt nut, rivet, etc.) is inserted into the overlapped hole, and the first member 6a and the second hole The member 6b is connected. Specifically, as shown in FIG. 5 (a), when the overlap of the first member 6a and the second member 6b is increased, the long holes 14a and 14b and the round holes 15a and 15b of one set overlap, As shown in FIG. 5 (b), when the overlap of the first member 6a and the second member 6b is reduced, the holes 14a, 14b and the round holes 15a, 15b of the other set overlap each other. Is arranged. Thereby, the range of overlap allowance (polymerization stroke) twice as long as the length of the long holes 14a and 14b can be secured, and the strength reduction caused by lengthening the long holes 14a and 14b can be suppressed.

  As shown in FIG. 4, the overlapping portion 10a of the first member 6a includes a joggle portion 17a having a level difference corresponding to the plate thickness of the fixing portion 11a, and a surface portion 18a that is flush with the fixing portion 11a. Have Similarly, the overlapping portion 10b of the second member 6b has a joggle portion 17b and a surface portion 18b. The joggle portion 17a (17b), part of the surface, and 18a (18b) are arranged adjacent to each other in the vertical direction. Between the joggle portion 17a (17b) and the surface portion 18a (18b), and between the joggle portion 17a (17b) and the fixed portion 11a (11b), an inclined portion 19a (19b) that is inclined by the above plate thickness. ) Is provided.

  The joggle portion 17a, the surface portion 18a, and the inclined portion 19a of the first member 6a and the joggle portion 17b, the surface portion 18b, and the inclined portion 19b of the second member 6b are point-symmetric with respect to the vehicle center axis C. . As shown in FIG. 5, the joggle portion 17a of the first member 6a is overlaid on the surface part 17b of the second member 6b, and the joggle part 17b of the second member 6b is overlaid on the surface part 18a of the first member 6a. Then, the fixing portion 11a of the first member 6a and the fixing portion 11b of the second member 6b are flush with each other. That is, the web 7a, the upper flange 8a, and the lower flange 9a of the fixing portion 11a of the first member 6a and the web 7b, the upper flange 8b, and the lower flange 9b of the fixing portion 11b of the second member 6b are flush with each other.

  As shown in FIG. 4, a notch portion 20a and a notch portion 20b are formed at the inner end in the vehicle width direction of the overlapping portion 10a of the first member 6a and the inner end in the vehicle width direction of the overlapping portion 10b of the second member 6b. The point is symmetrical with respect to the vehicle center axis C. The inclined portion 19a of the first member 6a and the inclined portion 19b of the second member 6b are formed in an L shape in front view and are point-symmetric with respect to the vehicle center axis. The one end portion 21a in the longitudinal direction of the inclined portion 19a of the first member 6a and the one end portion 21b in the longitudinal direction of the inclined portion 19b of the second member 6b are located at the centers of the notches 20a and 20b, respectively.

  The joggle portion 17a of the first member 6a shown in FIG. 4 is overlapped with the surface part 18b of the second member 6b, and the joggle portion 17b of the second member 6b is overlapped with the surface part 18a of the first member 6a. As shown in FIG. 5, a hole 22 is formed by the notch 20a of the first member 6a and the notch 20b of the second member 6b. The web 7a of the first member 6a and the web 7b of the second member 6b have holes 23a, 23b and notches 24a, 24b for weight reduction formed symmetrically with respect to the vehicle center axis C. Yes.

(Action / Effect)
As shown in FIGS. 2 to 5, according to the cross member 1 according to the present embodiment, by adjusting the overlap margin between the overlapping portion 10 a of the first member 6 a and the overlapping portion 10 b of the second member 6 b, The vehicle body frame F of a vehicle type in which the distance between the side rails 2a and 2b is different can be accommodated. Further, in the same vehicle type (the same vehicle body frame F), the overlapping portion 10a of the first member 6a and the vehicle body frame F in which the distance between the left and right side rails 2a, 2b differs depending on the position in the vehicle length direction By adjusting the overlap margin with the overlapping portion 10b of the second member 6b, it can be used as the cross member 1 mounted at a different position in the vehicle length direction.

  In addition, the first member 6a and the second member 6b are formed so that all the shapes including the overlapping portions 10a and 10b, the fixing portions 11a and 11b, the connecting holes 13a and 13b, the mounting holes 12a and 12b, etc. Since it is point-symmetric with respect to C and has substantially the same shape, one type of component can be used for body frames of various widths. Therefore, the types of cross members 1 to be manufactured according to the vehicle body frame F can be reduced, and parts management becomes easy. Further, in order to manufacture the cross member 1, it is necessary to prepare press working dies for each type, but the dies can be shared and the investment can be reduced.

  That is, according to the cross member 1 for a vehicle body frame according to the present embodiment, the first member 6a fixed to one of the pair of side rails 2a and 2b and the second member 6b fixed to the other are the vehicle center axis. It is shaped point-symmetrically with respect to C, and the overlapping portion 10a of the first member 6a and the overlapping portion 10b of the second member 6b are overlapped to match the distance between the side rails 2a and 2b in the vehicle width direction. By sliding and connecting with the fasteners inserted through the connecting holes 13a and 13b, it is possible to cope with the body frame F of various widths with one kind of parts, and to reduce the cost (see FIG. 5).

  As shown in FIG. 4, the overlapping portion 10a (10b) is flush with the joggle portion 17a (17b) having a step according to the plate thickness of the fixing portion 11a (11b) and the fixing portion 11a (11b). As shown in FIG. 5, the joggle portion 17a of the first member 6a is overlapped with the surface portion 18b of the second member 6b to form the second member 6b. When the joggle portion 17b is overlapped with the surface part 18a of the first member 6a, the fixing portion 11a of the first member 6a and the fixing portion 11b of the second member 6b are flush with each other.

  Thereby, the attachment hole 12a of the fixing | fixed part 11a of the 1st member 6a and the attachment hole 12b of the fixing | fixed part 11b of the 2nd member 6b become equal in the position of a vehicle length direction. Accordingly, the positions of the holes formed for attaching the first member 6a and the second member 6b to the left and right side rails 2a, 2b are the same position (laterally symmetrical position) in the vehicle length direction, and the left and right side rails 2a It is not necessary to shift the positions of the holes formed in 2b in accordance with the plate thickness of the cross member 1 on the left and right, and the drilling of the side rails 2a and 2b is facilitated.

  As shown in FIG. 4, the vehicle width direction inner end of the overlapping portion 10a of the first member 6a and the vehicle width direction inner end of the overlapping portion 10b of the second member 6b are point-symmetric with respect to the vehicle center axis C. The formed notches 20a and 20b are provided, respectively, and the inclined portion 19a that connects the joggle portion 17a and the surface portion 18a of the first member 6a and the joggle portion 17b and the surface portion 18b of the second member 6b are connected. The inclined portion 19b is point-symmetric with respect to the vehicle center axis C, and one end portion 21a in the longitudinal direction of the inclined portion 19a of the first member 6a and one end portion 21b in the longitudinal direction of the inclined portion 19b of the second member 6b. Are located in the notches 20a and 20b, respectively. Thereby, the overlapping portion 10a of the first member 6a and the overlapping portion 10b of the second member 6b can achieve both point symmetry with respect to the vehicle center axis C and slidability in the vehicle width direction. It can correspond to a body frame F with a wide width.

  As shown in FIG. 5, the joggle portion 17a of the overlapping portion 10a of the first member 6a is overlapped with the surface part 18b of the overlapping portion 10b of the second member 6b, and the joggle portion 17b of the overlapping portion 10b of the second member 6b is A hole 22 is formed by the cutout portion 20a of the first member 6a and the cutout portion 20b of the second member 6b by overlapping the surface portion 18a of the overlapping portion 10a of the first member 6a. Thus, since the hole 22 is formed in the central portion where the overlapping portion 10a of the first member 6a and the overlapping portion 10b of the second member 6b overlap, the weight can be reduced by an amount corresponding to twice the plate thickness. be able to. Further, since the material used is reduced by the amount corresponding to the holes 22, the cost can be reduced. Note that, as a result of the stress analysis, it is known that the generated stress is small in the central portion of the cross member 1, and there is no problem even if the hole 22 is provided.

(Modification 1)
FIG. 6 shows a cross member 1a in which the first member 6a and the second member 6b are connected by fillet welding instead of the fastening member 16 (see FIG. 2). The thick line 25 in FIG. 6 is a weld bead. The 1st member 6a and the 2nd member 6b are fillet welded in the state pressed down to the predetermined width dimension with the jig | tool which is not shown in figure. The cross member 1a according to the first modification has the same configuration as that of the cross member 1 according to the first embodiment except that the connection holes 13a and 13b (see FIG. 4) are omitted. Has an effect.

(Modification 2)
FIG. 7 shows a cross member 1b in which the first member 6a and the second member 6b are connected not by the fastening member 16 but by spot welding. The x mark 26 in FIG. 7 is a spot weld. The first member 6a and the second member 6b are spot-welded in a state where the first member 6a and the second member 6b are pressed down to a predetermined width by a jig not shown. The cross member 1b according to the second modification also has the same configuration as that of the cross member 1 according to the first embodiment except that the connection holes 13a and 13b (see FIG. 4) are omitted. Has an effect.

(Modification 3)
FIG. 8 shows a cross member 1c in which the first member 6a and the second member 6b are fastened to the webs 3a and 3b of the left and right side rails 2a and 2b shown in FIG. The cross member 1c is formed by bending the mounting flanges 27a and 27b by 90 degrees on the webs 7a and 7b of the fixing portions 11a and 11b of the first member 6a and the second member 6b, respectively. Attachment holes 28a and 28b are formed in 27b. The mounting flange 27a and mounting hole 28a of the first member 6a and the mounting flange 27b and mounting hole 28b of the second member 6b are point-symmetric with respect to the vehicle center axis C.

  The mounting flanges 27a and 27b are overlapped with the webs 3a and 3b (see FIG. 2) of the side rails 2a and 2b, and the side rails 2a are fastened by fasteners 16 (bolt nuts, rivets, etc.) inserted into the mounting holes 27a and 27b. 2b is fixed to the webs 3a and 3b. The cross member 1c according to the third modification has the same configuration as the cross member 1 according to the first embodiment, except that the mounting flanges 27a and 27b are added, and has the same effects. . The connection holes 13a and 13b may be omitted, and the first member 6a and the second member 6b may be fillet welded (see FIG. 6) or spot welded (see FIG. 7).

(Modification 4)
FIG. 9 shows a fourth modification of the joggle portions 17 a and 17 b of the cross member 1. FIG. 9A is a front view of the cross member 1d in which the joggle portions 17a and 17b are made larger than in the first embodiment (see FIG. 4), and FIG. 9B is a cross member 1e in which the joggle portions 17a and 17b are made smaller. FIG. 9C is a front view of the cross member 1f in which the joggle portions 17a and 17b are further reduced.

  Similarly to the first embodiment, the cross members 1d, 1e, and 1f according to the modified example 4 have the vehicle center at the vehicle width direction inner end of the first member 6a and the vehicle width direction inner end of the second member 6b. Cutout portions 20a and 20b formed symmetrically with respect to the axis C are provided, an inclined portion 19a that connects the joggle portion 17a of the first member 6a and the surface portion 18a, and a joggle portion 17b of the second member 6b. And the inclined portion 19b connecting the surface portion 18b is point-symmetric with respect to the vehicle center axis C, the longitudinal end portion 21a of the inclined portion 19a of the first member 6a, and the inclined portion of the second member 6b. One end 21b in the longitudinal direction of 19b is located in each of the notches 20a and 20b.

  As a result, also in the cross members 1d, 1e, and 1f according to the modified example 4, the first member 6a and the second member 6b can achieve both point symmetry with respect to the vehicle center axis C and slidability in the vehicle width direction. One kind of parts can correspond to the vehicle body frame F having various widths, and the same effects as the first embodiment can be obtained.

(Second Embodiment)
FIG. 10 shows a cross member 1g for a vehicle body frame according to the second embodiment of the present invention. The cross member 1g corresponds to the height dimension of the side rails 2a and 2b shown in FIG. The cross member 1g according to the second embodiment has the same technical idea as the cross member 1 according to the first embodiment corresponding to the size in the width direction of the side rails 2a and 2b. To do.

  The cross member 1g according to the second embodiment includes an upper member 6c disposed in an upper portion between the pair of side rails 2a and 2b and a lower portion disposed in a lower portion between the pair of side rails 2a and 2b. A side member 6d, and the upper member 6c and the lower member 6d are superposed portions 10c and 10d which are slidably overlapped in the vertical direction, and fixed portions 11c and 11d fixed to the side rails 2a and 2b. The overlapping portion 10c and the fixing portion 11c of the upper member 6c and the overlapping portion 10d and the fixing portion 11d of the lower member 6d are point-symmetric with respect to the vehicle center axis C extending in the vehicle body longitudinal direction.

  The overlapping portion 10c of the upper member 6c has a joggle portion 17c that is stepped according to the plate thickness of the fixing portion 11c, and a surface portion 18c that is flush with the fixing portion 11c. Similarly, the overlapping portion 10d of the lower member 6d has a joggle portion 17d and a surface portion 18d. The joggle portion 17c and the surface portion 18c of the upper member 6c and the joggle portion 17d and the surface portion 18d of the lower member 6d are point-symmetric with respect to the vehicle center axis C. The joggle portion 17c of the upper member 6c is overlapped with the surface part 18d of the lower member 6d, the joggle portion 17d of the lower member 6d is overlapped with the surface part 18c of the upper member 6c, and the fixed portion 11c of the upper member 6c. The fixing portion 11d of the lower member 6d is flush with the fixing member 11d.

  Cutout portions 20c and 20d formed symmetrically with respect to the vehicle center axis C are provided at the lower end of the overlapping portion 10c of the upper member 6c and the upper end of the overlapping portion 10d of the lower member 6d, respectively. An inclined portion 19c that connects the joggle portion 17c and the surface portion 18c of the upper member 6c and an inclined portion 19d that connects the joggle portion 17d and the surface portion 18d of the lower member 6d are pointed with respect to the vehicle center axis C. It is formed symmetrically. One end portion 21c in the longitudinal direction of the inclined portion 19c of the upper member 6c and one end portion 21d in the longitudinal direction of the inclined portion 19d of the lower member 6d are located in the notches 20c and 20d, respectively.

  The joggle portion 17c of the upper member 6c is overlapped with the surface part 18d of the lower member 6d, the joggle portion 17d of the lower member 6d is overlapped with the surface part 18c of the upper member 6c, and the notch portion 20c of the upper member 6c. A hole 29 is formed by the notch 20d of the lower member 6d. Moreover, the hole 31 is formed by the notch 30c formed in the upper member 6c and the notch 30d formed in the lower member 6d.

  Connection holes 13c and 13d for connecting the upper member 6c and the lower member 6d are formed in the overlapping portion 10c of the upper member 6c and the overlapping portion 10d of the lower member 6d, respectively. The connecting hole 13c is formed in a portion that becomes a web of the cross member 1g, and has a long hole 14c and a round hole 15c formed along the vertical direction. Similarly, the connecting hole 13d has a long hole 14d and a round hole 15d. The long hole 14c and the round hole 15c of the upper member 6c and the long hole 14d and the round hole 15d of the lower member 6d are formed point-symmetrically with respect to the vehicle center axis C, and are connected to the overlapping portion 10c of the upper member 6c. When the overlapping portion 10d of the lower member 6d is overlapped, the long hole 14c of the upper member 6c overlaps the round hole 15d of the lower member 6d, and the long hole 14d of the lower member 6d is the round hole 15c of the upper member 6c. It is supposed to overlap. The fastener 16 (see FIG. 2) is inserted into the overlapped hole, and the upper member 6c and the lower member 6d are connected.

  According to the cross member 1g according to the second embodiment, the upper member 6c fixed to the upper part between the pair of side rails 2a and 2b (see FIG. 2), and the lower member 6d fixed to the lower part. Is shaped point-symmetrically with respect to the vehicle center axis C, and the upper member 6c and the lower member 6d are slidable in the vertical direction so that they can be used for various types of body frames F with a single type of component. And cost reduction can be achieved. In addition, it has the same configuration as that of the cross member 1 according to the first embodiment, and has the same effects. The connecting holes 13c and 13d may be omitted, and the upper member 6c and the lower member 6d may be fillet welded (see FIG. 6) or spot welded (see FIG. 7).

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments, and various modifications within the scope described in the claims. Needless to say, the modified examples also belong to the technical scope of the present invention.

  INDUSTRIAL APPLICABILITY The present invention can be used for a cross member for a vehicle body frame that is mounted between a pair of side rails that are spaced apart in the vehicle width direction.

DESCRIPTION OF SYMBOLS 1 Cross member 2a Side rail 2b Side rail 6a 1st member 6b 2nd member 10a Overlapping part 10b Overlapping part 11a Fixed part 11b Fixed part 13a Connecting hole 13b Connecting hole 14a Long hole 14b Long hole 15a Round hole 15b Round hole 16 Fastener 17a Joggle portion 17b Joggle portion 18a Surface portion 18b Surface portion 19a Inclined portion 19b Inclined portion 20a Notched portion 20b Notched portion 21a Inclined portion longitudinal end portion 21b Inclined portion longitudinal end portion 22 Hole F Body frame C Vehicle center axis

Claims (10)

A cross member for a vehicle body frame that is mounted between a pair of side rails arranged at intervals in the vehicle width direction,
A first member fixed to one of the pair of side rails;
A second member fixed to the other of the pair of side rails,
The first member and the second member are each composed of an overlapping portion that is slidably overlapped in the vehicle width direction, and a fixing portion that is fixed to the side rail.
The overlapping portion and the fixing portion of the first member and the overlapping portion and the fixing portion of the second member are point-symmetric with respect to a vehicle center axis extending in the vehicle longitudinal direction.
A cross member for a vehicle body frame. The overlapping portion has a joggle portion that is stepped according to the plate thickness of the fixed portion, and a part of the surface that is flush with the fixed portion,
The joggle part and part of the surface of the first member and the joggle part and part of the surface of the second member are point-symmetric with respect to the vehicle center axis,
The joggle part of the first member is overlaid on a part of the surface of the second member, the joggle part of the second member is overlaid on a part of the surface of the first member,
The fixing part of the first member and the fixing part of the second member are flush with each other.
The cross member for a vehicle body frame according to claim 1. Cutout portions formed point-symmetrically with respect to the vehicle center axis are respectively provided at an inner end in the vehicle width direction of the overlapping portion of the first member and an inner end in the vehicle width direction of the overlapping portion of the second member. ,
An inclined portion that connects the joggle portion of the first member and a part of the surface, and an inclined portion that connects the joggle portion of the second member and a portion of the surface are point-symmetric with respect to the vehicle center axis,
One end portion in the longitudinal direction of the inclined portion of the first member and one end portion in the longitudinal direction of the inclined portion of the second member are located in the notch portion, respectively.
The cross member for a vehicle body frame according to claim 2. The joggle part of the first member is overlaid on a part of the surface of the second member, the joggle part of the second member is overlaid on a part of the surface of the first member,
A hole is formed by the notch portion of the first member and the notch portion of the second member.
The cross member for a vehicle body frame according to claim 3. Connection holes for connecting the first member and the second member are formed in the overlapping portion of the first member and the overlapping portion of the second member, respectively.
The connection hole has a long hole and a round hole formed along the vehicle width direction,
The elongated hole and the round hole of the first member and the elongated hole and the round hole of the second member are point-symmetric with respect to the vehicle center axis,
When the overlapping portion of the first member and the overlapping portion of the second member are overlapped, the long hole of the first member overlaps the round hole of the second member, and the long hole of the second member is the first hole. A fastener is inserted through the overlapped hole in one member, and the first member and the second member are connected.
The cross member for a vehicle body frame according to any one of claims 1 to 4, wherein the cross member is a vehicle body frame. A vehicle cross member mounted between a pair of side rails arranged at intervals in the vehicle width direction,
An upper member disposed in an upper portion between the pair of side rails;
A lower member disposed in a lower portion between the pair of side rails,
The upper member and the lower member are each composed of an overlapping portion that is slidably overlapped in the vertical direction and a fixing portion that is fixed to the side rail,
The overlapping portion and the fixing portion of the upper member and the overlapping portion and the fixing portion of the lower material are point-symmetric with respect to the vehicle center axis extending in the vehicle longitudinal direction.
A cross member for a vehicle body frame. The overlapping portion has a joggle portion that is stepped according to the plate thickness of the fixed portion, and a part of the surface that is flush with the fixed portion,
The joggle part and the surface part of the upper member and the joggle part and the surface part of the lower member are point-symmetric with respect to the vehicle center axis,
The joggle part of the upper member is overlapped with a part of the surface of the lower member, the joggle part of the lower member is overlapped with a part of the surface of the upper member,
The fixed portion of the upper member and the fixed portion of the lower member are flush with each other.
The cross member for a vehicle body frame according to claim 6. Cutout portions formed symmetrically with respect to the vehicle center axis are respectively provided at the lower end of the overlapping portion of the upper member and the upper end of the overlapping portion of the lower member,
The inclined portion that connects the joggle portion of the upper member and a part of the surface, and the inclined portion that connects the joggle portion of the lower member and a portion of the surface are point-symmetric with respect to the vehicle center axis,
One end portion in the longitudinal direction of the inclined portion of the upper member and one end portion in the longitudinal direction of the inclined portion of the lower member are respectively located in the notch portions.
The cross member for a vehicle body frame according to claim 7. The joggle part of the upper member is overlapped with a part of the surface of the lower member, the joggle part of the lower member is overlapped with a part of the surface of the upper member,
A hole is formed by the notch portion of the upper member and the notch portion of the lower member.
The cross member for a vehicle body frame according to claim 8. Connection holes for connecting the upper member and the lower member are respectively formed in the overlapping portion of the upper member and the overlapping portion of the lower member,
The connection hole has a long hole and a round hole formed along the vertical direction,
The long hole and round hole of the upper member and the long hole and round hole of the lower member are point-symmetric with respect to the vehicle center axis,
When the overlapping portion of the upper member and the overlapping portion of the lower member are overlapped, the long hole of the upper member overlaps the round hole of the lower member, and the long hole of the lower member is A fastener is inserted into the overlapping hole, overlapping the round hole, and the upper member and the lower member are connected,
The cross member for a vehicle body frame according to any one of claims 6 to 9, wherein the cross member is a body frame.

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