JP2019084871A - Vehicle body frame structure - Google Patents

Abstract

To provide a vehicle body frame structure capable of well discharging the air gathered in a side frame in the course of electrodeposition process.SOLUTION: The vehicle body frame structure, constituted by connecting a rear end part of a front frame 5 with a front end part of a rear frame 6 by spigot-joining, extends an edge 57 on a vehicle backward side in a second plane part 56a of the front frame 5 inserted into the rear frame 6 in such a direction as to approach a poultice part 53a more as going toward the central side in vehicle width direction in a side frame 2. Thus, during an electrodeposition process of a vehicle body frame, by oscillating the vehicle body frame around a horizontal axis extending in the vehicle width direction, the edge 57 inclines upward more as going toward the central side in the vehicle width direction in the side frame 2 more, and when air B is stored around the edge 57 of the second plane part 56a, the air B can be discharged from the side frame 2. As a result, the inner surface of the side frame 2 is well electropositioned, providing a satisfactory coating film.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a vehicle body frame structure. In particular, the present invention relates to the improvement of a joint portion in a side frame formed by joining a plurality of frames by a print joint.

  Conventionally, as disclosed in, for example, Patent Document 1, a vehicle body frame such as a truck or a bus includes a pair of left and right side frames (also referred to as side rails) extending along the longitudinal direction of the vehicle body. It is equipped with a cross member bridged between them.

  Further, Patent Document 1 discloses a structure in which the side frames are constituted by a plurality of frames having a closed cross-sectional structure, and the respective frames (the end portions of the respective frames) are joined together by a printing joint.

  FIG. 6 is a perspective view showing a conventional print joint portion in which side frames a disposed on the left side in the vehicle width direction are connected to each other and the frames b and c constituting the side frame a. The arrow FR in FIG. 6 indicates the front of the vehicle, the arrow UP indicates the upward, and the arrow LH indicates the left of the vehicle. As shown in FIG. 6, as each of the frames b and c, a front frame b located on the front side of the vehicle body and a rear frame c joined to the rear end of the front frame b by a seal joint are provided. There is. Each of these frames b and c has a closed cross-sectional structure in which an inner frame material c1 (the inner frame material of the front frame b is not shown) and an outer frame material b2 and c2 are joined. Further, in the rear frame c shown in FIG. 6, the front end edge of the outer frame member c2 is located on the vehicle rear side with respect to the front end edge of the inner frame member c1. The rear end portion of the outer frame member b2 of the front frame b is set to have a small cross-sectional shape via the back cut portion (step portion) b3 so that it can be inserted inside the outer frame member c2 of the rear frame c. The joint b4 is provided. The outer edge shape of the joint portion b4 substantially matches the inner edge shape of the outer frame member c2 of the rear frame c. Then, the front frame b is inserted inside the rear frame c (the bonding portion b4 is inserted) so that the outer frame material c2 of the rear frame c is superimposed on the outside of the bonding portion b4, and the bonding portion b4 And the outer frame material c2 of the rear frame c are welded, and the inner frame material c1 of the rear frame c covers the upper surface of the outer frame material c2 of the rear frame c and the upper surface of the outer frame material b2 of the front frame b. The upper plate portion c3 is overlapped and welded, whereby the three frame members b2, c1 and c2 are integrally welded in the printing joint portion. A lower plate portion (not shown) of the inner frame member c1 of the rear frame c is overlapped and welded over the lower surface of the outer frame member c2 of the rear frame c and the lower surface of the outer frame member b2 of the front frame b. Also in this portion, the three frame members b2, c1 and c2 are integrally welded.

JP, 2004-17746, A

  By the way, in the production line of a vehicle body frame, various pretreatment processes are performed, and one of them is an electrodeposition coating process (undercoating process). In this electrodeposition coating process, the vehicle body frame is immersed for a predetermined time in a tank (electrodeposition tank) in which the electrodeposition paint is stored, during which a predetermined DC voltage is applied between the vehicle body frame and the in-tank electrode. . By the application of this DC voltage, the paint components present as ions in the paint are electrically deposited on the surface of the vehicle body frame of the opposite polarity to form a paint film.

  However, since the side frame a has a closed cross-sectional structure, air (bubbles) e are easily accumulated inside, and there is a possibility that electrodeposition coating can not be performed well in the area where the air e is accumulated. For example, there is a possibility that the film thickness of a paint film may not be obtained sufficiently.

  As means for discharging the air e, the body frame (side frame a) is rocked around a horizontal axis extending in the vehicle width direction (see arrow d in FIG. 6).

  However, in the case where the plurality of frames b and c are connected to each other by the printing joint as described above, there is a possibility that the air e can not be discharged even if the body frame is swung.

  That is, as shown in FIG. 6, the air e is accumulated around the edge b5 of the bonding portion b4 (a portion extending from the edge b5 of the bonding portion b4 to the inner surface (lower surface) of the upper plate c4 of the outer frame member c2) In this case, even if the vehicle body frame is pivoted about the horizontal axis, this air e only moves along the inner surface (lower surface) of the upper plate portion c4 of the outer frame member c2 in the predetermined range in the frame longitudinal direction. Further, the movement of the air e to the front side of the vehicle body is blocked by the edge b5 of the joint b4, and it is difficult to discharge the air e.

  Although it is also conceivable to form a hole in the upper surface of the side frame a (for example, the upper plate portion c4 of the rear frame c) as means for discharging the air e, the upper surface of the side frame a is a separate member When covered, it is difficult to discharge the air e.

  The present invention has been made in view of such a point, and an object thereof is to provide a vehicle body frame structure capable of satisfactorily discharging air accumulated in a side frame during an electrodeposition coating process. is there.

  The solution according to the present invention for achieving the above object comprises a first frame and a second frame which have a closed cross-sectional structure in which an inner frame material and an outer frame material are joined and which extend along the vehicle longitudinal direction. It presupposes that the vehicle body frame structure provided with the side frame formed by joining the edge part of the said 1st flame | frame, and the edge part of the said 2nd flame | frame by a printing joint. In this vehicle body frame structure, at least one of the outer frame material and the inner frame material of the first frame extends between the upper and lower plate portions and between the upper and lower plate portions. The upper plate portion and the lower plate portion respectively have a side plate portion, and the upper plate portion and the lower plate portion respectively extend in a horizontal direction along the longitudinal direction of the vehicle body, and in the first flat portion of the upper plate portion. Back cut portions extending upward from one end edge of the first flat plate portion of the lower plate portion upward from the end edge of one side of the vehicle body in the front-rear direction, and each back cut And a second flat portion extending horizontally along the longitudinal direction of the vehicle body and inserted into the second frame, and the second flat portion of the upper plate and At least electrodeposition of the second flat portion of the lower plate portion An end edge of the second flat portion located on the upper side at the time of the mounting process is inserted in the inside of the second frame in a direction approaching the back cut portion toward the center side in the vehicle width direction of the side frame. It is characterized by extending.

  According to this particular matter, during the electrodeposition coating process of the vehicle body frame, when the vehicle body frame is swung (up and down) about the horizontal axis extending in the vehicle width direction while immersed in the electrodeposition tank, the first frame Is rocked so as to be positioned above the second frame, the end edge of the second plane portion which is inserted into the inside of the second frame (following the center side of the side frame in the vehicle width direction) An edge extending in a direction approaching the spine portion is inclined upward as it goes to the center side in the vehicle width direction of the side frame. Therefore, when air is accumulated around the edge of the second flat portion, the air floats along the edge of the inclined second flat portion by its buoyancy, and the air After reaching the upper end of the edge, it is discharged from the side frame by rising inside the side frame. Therefore, the inner surface of the side frame can be electrodeposited well, and a sufficient coating film can be obtained.

  In the present invention, the frame member of the first frame is provided with a back cut portion, and the second flat portion continuous with the back cut portion is inserted into the inside of the second frame, thereby the end portion of the first frame and the second frame In the vehicle body frame structure provided with a side frame formed by joining a seal joint with an end of the frame, an end of the side inserted into the inside of the second frame in the second flat portion positioned on the upper side during the electrodeposition coating process The edge is extended in the direction approaching the spine along the center of the side frame in the vehicle width direction. As a result, the body frame (side frame) is swung around the horizontal axis extending in the vehicle width direction during the electrodeposition coating process of the body frame, whereby the side inserted in the second frame in the second plane portion The edge is inclined upward toward the center of the side frame in the vehicle width direction, and if air is accumulated around the edge of the second flat portion, the air is taken from the side frame It can be discharged. As a result, the inner surface of the side frame can be electrodeposited well, and a sufficient coating film can be obtained.

It is a perspective view showing a body frame concerning an embodiment. It is a perspective view showing a seal joint part which connected each frame material in a side frame concerning an embodiment. It is a figure for demonstrating the rocking | fluctuation of the side frame at the time of an electrodeposition coating process. It is a figure for demonstrating the discharge | emission operation | movement of the air accompanying rocking | fluctuation of a side frame, Comprising: It is the FIG. 2 equivalent view which shows a part of frame material with an imaginary line. It is V arrow direction view in FIG. 4 which shows the outer frame material of a front side frame, Comprising: Fig.5 (a) is a state before rocking | fluctuation of a side frame, FIG. FIG. It is a perspective view which shows the printing joint part which connected each flame | frame material in the conventional side frame.

  Hereinafter, embodiments of the present invention will be described based on the drawings. In this embodiment, a case where the present invention is applied to a side frame of a vehicle body frame configured as a so-called ladder frame will be described.

-General structure of body frame-
FIG. 1 is a perspective view showing a vehicle body frame 1 according to the present embodiment. The arrow FR in FIG. 1 indicates the front of the vehicle, the arrow UP indicates the upward, the arrow RH indicates the right of the vehicle, and the arrow LH indicates the left of the vehicle.

  As shown in FIG. 1, the vehicle body frame 1 includes a pair of left and right side frames 2 and 2 extending along the vehicle body longitudinal direction on both outer sides in the vehicle width direction. The side frames 2 and 2 each have an intermediate portion 2A, a front kick portion 2B, a front portion 2C, a rear kick portion 2D and a rear portion 2E which are continuous along the longitudinal direction of the vehicle body.

  The intermediate portion 2A extends in the horizontal direction along the longitudinal direction of the vehicle body in a predetermined range between the arrangement position of the vehicle front wheel (not shown) and the arrangement position of the vehicle rear wheel (not shown). The front kick portion 2B is shaped to be continuous with the front end portion of the intermediate portion 2A and to be curved upward as it goes to the front side of the vehicle body. The front portion 2C is continuous with the front end portion of the front side kick portion 2B and extends to the front side of the vehicle body. The front wheel of the vehicle is disposed on the outer side in the vehicle width direction at the front portion 2C. For this reason, the dimensions in the vehicle width direction (the dimensions between the left and right side frames 2, 2) at the front portions 2C, 2C of the side frames 2, 2 take into account the interference with the front wheel of the vehicle. It is set shorter than the dimension in the vehicle width direction in 2A, 2A.

  The rear kick portion 2D is shaped to be continuous with the rear end portion of the intermediate portion 2A and to be curved upward as it goes to the rear side of the vehicle body. The rear portion 2E is continuous with the rear end portion of the rear kick portion 2D and extends to the rear side of the vehicle body. The rear wheel of the vehicle is disposed on the outer side in the vehicle width direction at the rear portion 2E. For this reason, the dimensions in the vehicle width direction at the rear portions 2E, 2E of the side frames 2, 2 (dimensions between the left and right side frames 2, 2) are also the middle portion in consideration of the interference with the rear wheel of the vehicle. It is set shorter than the dimension in the vehicle width direction in 2A, 2A.

  Crash boxes 3, 3 for absorbing energy (collision load) at the time of a frontal collision of the vehicle are provided on the front sides of the front portions 2C, 2C of the pair of left and right side frames 2, 2, respectively. A bumper reinforcement (not shown) extending along the vehicle width direction is bridged over the front ends of the pair of left and right crash boxes 3.

  A plurality of cross members 41, 42, 43, 44, 45, 46, 47 extending along the vehicle width direction are bridged between the side frames 2, 2. Thus, the vehicle body frame 1 of the present embodiment is configured as a ladder frame (ladder frame).

  Between the cross members 41 and the cross members 42 in the front portions 2C and 2C of the side frames 2 and 2, a metal suspension mount bracket 11 is disposed which protrudes outward in the vehicle width direction.

  Further, cab mount brackets 12, 13, 14 are disposed at the rear end of the front side kick portion 2B, the front end of the front portion 2C, and the front end of the rear side kick portion 2D. These cab mount brackets 12, 13 and 14 are projected outward in the vehicle width direction, and a cab mount (not shown) can be attached. Then, the cabin can be connected to the side frame 2 through the cab mount and the cab mount brackets 12, 13, 14.

-Structure of side frame-
Next, the structure of the side frames 2 and 2, which is a feature of the present embodiment, will be described. Since the structures of the side frames 2 and 2 are the same (i.e., symmetrical), the side frame 2 located on the left side in the vehicle width direction will be described as an example.

  In the side frame 2 according to the present embodiment, the frames 5 and 6 are joined together by a seal joint at a central portion in the longitudinal direction of the vehicle body in the intermediate portion 2A. Further, in the side frame 2, the frames 6 and 7 are also joined together by a seal joint at a central portion in the front-rear direction of the vehicle body in the rear portion 2E. Since the structure of the connection part by these printing joints is the same, here, the connection part in middle part 2A of side frame 2 located in the left side is explained as a representative.

  FIG. 2 is a perspective view showing a print joint portion in which the respective frames (the front frame 5 and the rear frame 6) in the side frame 2 according to the present embodiment are joined together. As shown in FIG. 2, the seal joint portion has a front frame (first frame according to the present invention) 5 and a rear frame (second frame according to the present invention) 6 each having a substantially rectangular closed cross section. And the part that In the front frame 5 and the rear frame 6, outer frame members (outer channels) 51, 61 and inner frame members (inner channel) 52, 62 (for the inner frame member 52 of the front frame 5 see FIG. 1) are arcs. It is comprised by the closed cross-section structure joined by welding etc., respectively.

  As shown in FIG. 2, the frame members 51, 52, 61, 62 in the respective frames 5, 6 are side plate portions 51a, 61a, 62a extending in the vertical direction (the inner frame members 52 of the front frame 5 are shown in FIG. 2), upper plate portions 51b, 61b, 62b extending in the horizontal direction from the upper end edges of the side plate portions 51a, 61a, 62a, and horizontally extending from the lower end edges of the side plate portions 51a, 61a, 62a It is a member having a U-shaped cross section provided with existing lower plate portions 51c, 61c.

  Then, in the front frame 5, the upper plate portion 51b of the outer frame member 51 and the upper plate portion (not shown in FIG. 2) of the inner frame member 52 are welded, and the lower plate portion 51c of the outer frame member 51 and the inner frame member The lower plate portion 52 is welded to form the front frame 5 in a substantially rectangular closed cross section. Similarly, in the rear frame 6, the upper plate portion 61 b of the outer frame member 61 and the upper plate portion 62 b of the inner frame member 62 are welded, and the lower plate portion 61 c of the outer frame member 61 and the lower plate of the inner frame member 62 Parts (not shown) are welded, whereby the rear side frame 6 is also formed in a substantially rectangular closed cross-sectional structure.

  Further, in the front frame 5, the rear end edge of the outer frame member 51 is located on the vehicle rear side with respect to the rear end edge of the inner frame member 52. Further, in the rear side frame 6, the front end edge of the outer frame member 61 is located on the vehicle rear side with respect to the front end edge of the inner frame member 62. For this reason, the seal joint portion between the outer frame members 51, 61 is positioned on the vehicle body rear side relative to the seal joint portion between the inner frame members 52, 62.

  Then, as a seal joint in which the rear end portion of the front side frame 5 is joined to the front end portion of the rear side frame 6 by joining the both ends 5, 6, as a structure of the seal joint of the inner frame members 52, 62 The outer surface of the side plate portion of the inner frame member 52 of the front side frame 5 (surface facing inward in the vehicle width direction), the upper surface of the upper plate portion, and the shape (shape of U shape) covering the lower surface of the lower plate portion Shape (U-shaped) covering the inner surface (surface facing the outside in the vehicle width direction) of the side plate portion 62a of the inner frame member 62 of the rear frame 6, the lower surface of the upper plate portion 62b, and the upper surface of the lower plate portion The rear end portion of the inner frame member 52 of the front frame 5 is inserted into the front end portion of the inner frame member 62 of the rear frame 6 so that the surfaces are in contact with each other. The parts are welded.

  On the other hand, as a structure of the seal joint of the outer frame members 51, 61, the rear end portion of the outer frame member 51 of the front frame 5 can be inserted inside the outer frame member 61 of the rear frame 6. In order to obtain the following, a junction 54 whose cross-sectional shape is set to be small is provided via the back cut portions (step portions) 53a and 53b.

  Specifically, the upper plate portion 51b and the lower plate portion 51c of the outer frame member 51 of the front frame 5 are provided with first flat portions 55a and 55b extending in the horizontal direction along the longitudinal direction of the vehicle body. Further, a spine cutting portion 53a extending obliquely downward from an end edge (end edge of the vehicle rear side) of the first flat portion 55a of the upper plate portion 51b, and a first flat portion 55b of the lower plate portion 51c. The back-cut portion 53b extends diagonally upward from the end edge (the end edge on the rear side of the vehicle body). Further, the upper plate portion 51b and the lower plate portion 51c of the outer frame member 51 of the front frame 5 are continuous to the respective back cut portions 53a and 53b, and extend in the horizontal direction along the vehicle longitudinal direction. The units 56a and 56b are provided.

  For this reason, the joint portion 54 is configured by the rear end portions of the second flat portions 56a and 56b and the side plate portion 51a. The outer surface shape (U-shaped shape) of the joint portion 54 is the inner surface (surface facing inward in the vehicle width direction) of the side plate portion 61a of the outer frame member 61 of the rear frame 6 and the lower surface of the upper plate portion 61b. The outer frame member of the rear frame 6 substantially conforms to the shape (C-shape) of the lower plate portion 61c and is the rear end portion of the outer frame member 51 of the front frame 5. These contact portions are welded in a state where they are inserted into the front end portion of 61 and the surfaces are in contact with each other.

  Thus, by providing the back cut portions 53a and 53b in the outer frame member 51 of the front frame 5, the front end portions of the outer frame member 61 of the rear frame 6 are continuous with the back cut portions 53a and 53b. The joint portion 54 having the second flat portions 56 a and 56 b is inserted, and the first flat portion 55 a of the outer frame member 51 of the front frame 5 and the upper plate portion 61 b of the outer frame member 61 of the rear frame 6 The upper plate portion 62b of the inner frame member 62 of the rear frame 6 is overlapped on the upper side, and these are integrally welded. That is, three frame members (the outer frame member 51 of the front frame 5, the outer frame member 61 of the rear frame 6 and the inner frame member 62) are integrally welded in the printing joint portion. Similarly, the rear frame is provided on the lower side of each of the first flat surface 55b (the first flat surface 55b on the lower side) of the outer frame 51 of the front frame 5 and the lower plate 61c of the outer frame 61 on the rear frame 6. The lower plate portions of the six inner frame members 62 are overlapped, and these are integrally welded. That is, also in this portion (the lower portion of the side frame 2), the three frame members (the outer frame 51 of the front frame 5, the outer frame 61 of the rear frame 6, and the inner frame 62) are integrally welded. It will be done.

  Further, as a feature in the present embodiment, the end edges 57, 58 of the second flat portions 56a, 56b of the upper plate portion 51b and the lower plate portion 51c of the outer frame member 51 of the front frame 5 in the vehicle width direction Are inclined by a predetermined angle. Specifically, the edges 57, 58 on the vehicle body rear side of the second flat portions 56a, 56b are the center side in the vehicle width direction of the side frame 2 (the center side of the internal space of the side frame 2 having a closed cross sectional structure) It extends in a direction approaching the spine portions 53a and 53b as it goes to the direction. In other words, the edges 57, 58 on the rear side of the vehicle body in the second flat portions 56a, 56b are inclined toward the front of the vehicle body toward the center of the vehicle body frame 1 in the vehicle width direction. The inclination angle (a trim angle indicated by α in FIG. 2) is set to, for example, 30 °. The inclination angle is not limited to this value, and can be set as appropriate. When the edges 57, 58 on the rear side of the vehicle in the second flat portions 56a, 56b are thus inclined, the second flat portions 56a, 56b and the upper plate portion 61b and the lower plate portion of the outer frame member 61 are made. Although the overlapping area with 61 c becomes smaller at the center side in the vehicle width direction in the side frame 2 (see the dimension T in FIG. 2), this dimension T corresponds to the outer frame material 51 of the front frame 5 and the rear frame 6 The bonding strength with the outer frame material 61 is set by experiments or simulations so as to have sufficient dimensions.

-Electrodeposition coating process of body frame-
Next, the electrodeposition coating process of the vehicle body frame 1 will be described. This electrodeposition coating process is one of the pretreatment processes in the production line of the vehicle body frame 1 and the vehicle body frame 1 is immersed for a predetermined time in an electrodeposition tank in which the electrodeposition paint is stored. A predetermined DC voltage is applied between the and the in-tank electrode. By the application of this DC voltage, the paint components present as ions in the paint are electrically deposited on the surface of the vehicle body frame 1 of the opposite polarity, and a paint film is formed.

  In the immersion state of the vehicle body frame 1 in the electrodeposition tank in the electrodeposition coating process, the upper plate portions 51b, 61b, 62b of the frame members 51, 52, 61, 62 are on the upper side and the lower plate portions 51c, 61c are upward. It is arranged to be located on the lower side. Therefore, an edge 57 of the upper second flat portion 56a of the outer frame member 51 on the vehicle rear side is referred to as "inside of the second frame in the second flat portion positioned on the upper side at the electrodeposition coating step" in the present invention. It corresponds to "the end edge of the inserted side".

  Then, in the electrodeposition coating process, in order to discharge the air (bubbles) accumulated inside the vehicle body frame 1, the vehicle body frame 1 is swung around a horizontal axis extending in the vehicle width direction. FIG. 3 is a view for explaining the swinging of the side frame 2 at this time (the body frame members other than the side frame 2 are omitted), and as shown by arrows A1 and A2 in FIG. The side frame 2 is swung about a horizontal axis O1 extending in the vehicle width direction.

  Thus, when the vehicle body frame 1 is swung (up and down) about the horizontal axis O1 extending in the vehicle width direction while being immersed in the electrodeposition tank, the front frame 5 is more than the rear frame 6 When it is swung so as to be positioned on the upper side (when it is swung in the A1 direction in FIG. 3), the end edge on the vehicle rear side of the upper second flat portion 56a of the outer frame member 51 of the front frame 5 (side An end edge 57 extending in a direction approaching the back cut portion 53a toward the center side in the vehicle width direction of the frame 2 inclines upward toward the center side in the vehicle width direction in the side frame 2 It will be.

  FIG. 4 is a view for explaining the discharge operation of the air B accompanying the swinging of the side frame 2 and is a view corresponding to FIG. 2 showing a part of the frame members 61 and 62 by imaginary lines. 5 is a view on arrow V in FIG. 4 showing the outer frame member 51 of the front side frame 5. FIG. 5 (a) shows a state before swinging of the side frame 2, FIG. 5 (b) shows It is a figure which each shows the state (The state rock | fluctuated in the A1 direction in FIG. 3) which the side frame 2 rock | fluctuated.

  As apparent from FIG. 5 (b), when the front side frame 5 is swung so as to be positioned above the rear side frame 6, the second upper plane of the outer frame member 51 of the front side frame 5 The edge 57 on the vehicle body rear side of the portion 56a inclines upward as it goes to the center side (right side in FIG. 5) in the vehicle width direction of the side frame 2.

  Therefore, when air (bubbles) B are accumulated around the edge 57 of the second flat portion 56a, the air B follows the inclination of the edge 57 of the second flat portion 56a by its buoyancy. After rising up and reaching the upper end portion of the edge 57, it is discharged from the side frame 2 by floating the inside of the side frame 2 (shown by a broken line in FIG. 4 and FIG. 5 (b) See arrow). For this reason, it can be avoided that the electrodeposition coating can not be performed well due to the presence of the air B, and the inner surface of the side frame 2 can be electrodeposition coated favorably, and a sufficient coating film can be obtained.

-Other embodiment-
The present invention is not limited to the embodiment described above, and all modifications and applications that fall within the scope of the claims and the scope and equivalents thereof are possible.

  For example, in the embodiment, the frames 5, 6, 7 are joined together by the seal joints in the middle portion 2A and the rear portion 2E of the side frame 2, respectively, and the present invention is applied to these seal joints. The present invention is not limited to this, and the frames may be joined together by the print joints in the kick portions 2B and 2D and the front portion 2C in the side frames 2, and the present invention may be applied to these print joints.

  In the above embodiment, the rear end portion of the front frame 5 is inserted into the front end portion of the rear frame 6 as the structure of the seal joint, and the outer frame members 51 of the front frame 5 are provided with back cut portions 53a and 53b. The case where the present invention is applied to the above structure is described. The present invention is not limited to this, and it is also possible to apply the present invention to a structure in which the inner frame member 52 of the front frame 5 is provided with a back cut portion. Further, as the structure of the seal joint, the front end portion of the rear side frame 6 is inserted into the rear end portion of the front side frame 5, and the outer frame member 61 of the rear side frame 6 is provided with a back portion, It is also possible to apply the present invention to a structure in which the inner frame member 62 of No. 6 is provided with a back cut.

  Further, in the embodiment, the edges 57, 58 of the second flat portions 56a, 56b of the upper plate portion 51b and the lower plate portion 51c of the outer frame member 51 of the front frame 5 with respect to the vehicle body rear direction It has a structure in which it is inclined by a predetermined angle (extending in a direction approaching the spine portions 53a and 53b). The present invention is not limited to this, and only the edge 57 on the vehicle rear side of the second flat portion 56a of the upper plate portion 51b of the outer frame member 51 of the front frame 5 is inclined at a predetermined angle with respect to the vehicle width direction. May be

  The present invention is applicable to a vehicle body frame in which a plurality of frames are joined together by a seal joint.

1 body frame 2 side frame 5 front frame (first frame)
51 outer frame material 51a side plate portion 51b upper plate portion 51c lower plate portions 53a, 53b back surface cut portions 55a, 55b first flat surface portions 56a, 56b second flat surface portion 57 edge 6 of second flat surface portion rear frame (second flame)
61 Outer frame material 62 inner frame material

Claims (1)

It has a closed cross-section structure in which an inner frame material and an outer frame material are joined, and comprises a first frame and a second frame extending along the longitudinal direction of the vehicle body, and an end portion of the first frame and the second frame In a vehicle body frame structure provided with a side frame in which an end portion is connected by a printing joint,
At least one of the outer frame material and the inner frame material of the first frame has an upper plate portion and a lower plate portion, and a side plate portion extending between the upper plate portion and the lower plate portion. ,
The upper plate portion and the lower plate portion are
A first flat portion extending horizontally in the longitudinal direction of the vehicle body;
It extends downward from the end edge of one side of the first flat portion of the upper plate portion in the vehicle longitudinal direction, and extends upward from the end edge of the first flat portion of the lower plate portion in the longitudinal direction of the vehicle body. The existing spine section,
And a second flat portion which is continuous to each of the spine portions and extends in the horizontal direction along the longitudinal direction of the vehicle body and is inserted into the inside of the second frame.
At least a side of the second flat surface portion of the upper plate portion and the second flat surface portion of the lower plate portion that is inserted into the second frame in the second flat surface portion positioned on the upper side during the electrodeposition coating process A vehicle body frame structure, wherein an edge of the vehicle body frame extends in a direction approaching the spine along the center of the side frame in the vehicle width direction.

Images