JP2643122B2 - Vehicle chassis - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a chassis of a vehicle. This chassis has a plurality of stringers, a plurality of cross beams penetrating these stringers, and an outer frame, and these members are formed of an aluminum alloy material. The chassis is configured such that a plurality of floor members can be attached in a state of extending in the vertical direction of the chassis.

2. Description of the Related Art A conventional aluminum alloy chassis having such a configuration has two vertical girders and a large number of horizontal girders made of extruded members having a circular cross section as main components. These cross beams are connected to the vertical beams at the intermediate portions of the cross beams to support the vertical beams and have a predetermined interval so as to support a floor plate member attached to the chassis along the longitudinal direction of the chassis. And placed.

In particular, in the case of a chassis of a light vehicle, the vertical members constituting the outer frame can be configured to also serve as the vertical girder of a normal chassis. In this chassis, the ends of the cross beams are connected to the vertical members of the outer frame. The outer frame has two horizontal members in addition to these vertical members. The chassis configured as described above is referred to as a chassis with an external load support frame.

Further, in the case of a chassis of a heavy vehicle, a vertical girder constituting a main support member in the longitudinal direction of the chassis is arranged at a predetermined distance from both sides in the longitudinal direction of the chassis. The outer frame of this chassis is composed of two vertical members and two horizontal members. The horizontal member of the outer frame passes through an opening formed in the web of the stringer, and both ends thereof are joined to the vertical member of the outer frame. Such a chassis is referred to as a chassis with an inner load supporting frame.

At present, aluminum alloy chassis of this type is welded between the longitudinal and horizontal beams of the chassis, and between the vertical and horizontal members of the outer frame, similarly to the steel chassis. , A weld bead is present all around the cross beam.

Although the welded aluminum alloy chassis has sufficient strength, it has the following practical disadvantages. The first disadvantage is that the joint between the end of the cross beam and the member constituting the outer frame can be recognized from the outside of the chassis, so that the appearance is poor. The second disadvantage is that the production of the chassis is time-consuming due to the large number of welds. In particular, when the chassis is damaged by a vehicle accident or the like, the repair work of the chassis is complicated, and it takes much time to recover the damage of the chassis.

Problems to be Solved by the Invention An object of the present invention is to provide a new structure that facilitates joining of the vertical and horizontal beams that constitute the chassis and members that constitute the outer frame, and facilitates the manufacture and repair of the chassis. An object of the present invention is to provide an aluminum alloy chassis.

Means for Solving the Problems In order to solve the above problems, the vehicle chassis of the present invention has the following configuration. That is, a plurality of stringers, a plurality of cross beams penetrating the plurality of stringers, and an outer frame surrounding the plurality of stringers and the plurality of cross beams, and an aluminum alloy material In the vehicle undercarriage formed, at least one concave groove is formed in each of the plurality of cross beams, and the plurality of cross beams are connected to the plurality of vertical beams and the outside by a plurality of L-shaped members. One of the flanges of each of the L-shaped members is fixed to a plurality of vertical members constituting a frame, and a nut that engages on the side surface of the cross beam, on the back side of the edge of the opening of the concave groove, The other flange of a predetermined L-shaped member of the L-shaped member is fixed by a bolt screwed to the nut,
The web of the stringer is fixed by bolts and nuts, and the other flange of the remaining L-shaped member of the L-shaped member has a recess formed in the vertical member with respect to the vertical member. A chassis for a vehicle, wherein the chassis is fixed by a nut engaged with the back side of the edge of the opening of the groove and a bolt screwed to the nut.

In the underbody of the vehicle of the present invention, the joining of the vertical girder, the horizontal girder, and the outer frame is replaced with a bolt joint for facilitating assembly and disassembly of these constituent members instead of the conventional welding joint.

As shown in the embodiment of the present invention, the cross beam is formed with a concave groove on at least one of the vertical side surfaces when assembled in the form of a chassis, and this cross beam is formed by using a simple L-shaped member. Can be fixed. If the height of the vertical girder is sufficient, the concave groove portion of the horizontal girder can be formed on the lower surface of the horizontal girder. Even when the concave groove is formed on the lower surface of the cross beam,
Similarly, it is possible to use L-shaped members. In this case, one flange of the L-shaped member can be fixed to the concave groove on the lower surface of the cross beam, and the other flange can be fixed to the vertical beam below the cross beam. Alternatively, the L-shaped member may be a saddle-shaped member, and both flanges of the saddle-shaped member may be extended to both sides of the horizontal girder and fixed to the vertical girder.

The cross beam used in the present invention is desirably constituted by an open section having an S-shaped or E-shaped cross section as a whole, or constituted by a hollow section. The cross beam has a square cross-sectional shape having four corners, and the four corners are rounded to some extent as necessary.

The nut engaged with the back side of the edge of the opening of the concave groove of the cross beam is preferably formed of a parallelogram-shaped fastening member,
The height is made smaller than the width of the opening of the concave groove. It is also possible to attach the bolt to this nut in advance and attach it to the L-shaped member in advance. At this time,
The parallelogram nut has its longitudinal direction aligned with the direction of the flange of the L-shaped member. To connect a stringer and a cross beam using an L-shaped member to which nuts and bolts have been attached in advance, first insert a parallelogram nut through the opening of the recessed groove in the cross beam, The nut is rotated inside the hole to engage the nut behind the edge of the opening of the concave groove. Then, the L-shaped member is fixed to the cross beam by tightening bolts. By attaching bolts and nuts to the L-shaped member in advance, assembly of the chassis of the present invention can be facilitated. In particular, when the concave groove portion is formed on the vertical or substantially vertical side surface of the cross beam, assembling becomes easy only by attaching bolts and nuts to the L-shaped member in advance.

The chassis according to the invention can be used for all types of vehicles. For example, it can be used for road vehicles such as tank lorries, semi-trailers, rail cars, especially trucks, and is particularly suitable for a chassis for supporting a flat platform, a box-shaped body, a cooling unit, and the like.

Examples Hereinafter, examples of the present invention will be described.

As shown in FIG. 1, a chassis 1 of the present invention has two vertical beams 2, a plurality of horizontal beams 3, and an outer frame F, and the outer frame F includes two vertical members 4 and two horizontal members. Consists of five. These members 2, 3, 4, 5 constituting the chassis 1 are fixed to each other by a plurality of L-shaped members 6 bent in a mountain shape. The axle mounting portion, the saddle support portion, the crown pin portion, and the like of the chassis 1 can be provided with a horizontal support 7 between the vertical girder 2 in addition to the horizontal girder 3 as necessary. The carrier for supporting the cargo is constituted by arranging floor plate members 8 made of a material such as wood or aluminum alloy in the longitudinal direction of the chassis 1. These floor panel members 8 are arranged side by side on the horizontal beam 3 so as not to cover the upper surface 33 of the vertical beam 2, and the upper surface 32 of the floor panel member 8 is
And the upper surface 33 of the stringer 3 form substantially the same plane.

2 and 3 show the structure of the cross beam 3 and the mounting structure of the cross beam 3 to the vertical beam 2. The cross beam 3 is made of a rectangular hollow girder material as a whole, and the four beams have a rounded shape with no corners. Of the side of cross beam 3,
A pair of side surfaces which become vertical when the cross beam 3 is attached to the vertical beam 2 are formed with concave grooves 9 respectively, and these concave grooves 9 are formed on the side beams 3 as shown in FIG. It extends in the longitudinal direction and, as shown in FIG. 3, at a position symmetrical with respect to the center O of the cross section of the cross beam 3 and at two diagonal corners of this cross section. It is formed.

The stringer 2 shown in FIGS. 2 and 3 is a stringer developed for a semi-trailer, and has a gooseneck shape whose height changes along the longitudinal direction. The stringer 2 comprises an upper T-section 10 having a relatively high web 11 and a relatively low web 13
And a lower T-shaped member 12 having
The free end 14 of the lower web 13 has a thick cross section,
A groove 15 is formed in 14. Then, the upper T
Insert the lower end of the web 11 of the profile 10 and insert the upper T
The section 10 and the lower T section 12 are fixed. In order to form portions having different web heights in the stringers 2, the webs 11 of the upper T-shaped
To the desired height and, as described above, the grooves 15 of the web 13
The lower end of the web 11 is inserted into the
Is integrated with the web 13 of the lower T-shaped member 12 at the welded portion 16. In order to form the stringer 2 having a constant web height, the upper T-section 10
The web 11 may be connected to the web 13 of the lower T-shaped member 12 without cutting.

In the web 11, an opening 17 for fitting the cross beam 3 is formed by press working or other machining.
A bolt insertion hole 18 is formed.

In order to attach the cross beam 3 to the column beam 2, one flange 19 of the L-shaped member 6 is fixed to the column beam 2 by bolts 20 and nuts 21.
And the other flange 22 is attached to the cross beam 3 by bolts 23 and nuts 24. Bolts 20, 23 are
It is preferable that the bolt is a self-locking type bolt which is not easily loosened after fastening.

One flange 19 of the L-shaped member 6 is
It has a flat contact surface that abuts the eleven planes. The other flange 23 of the L-shaped member 6 has an elongated projection 25 that fits into the inlet opening 26 of the concave groove 9 of the cross beam 2. The inlet opening 26 has a width b, and the projection 25 fits into the inlet opening 26 to prevent rotation between the L-shaped member 6 and the cross beam 3. The nut 24 to be screwed into the bolt 23 is a parallelogram-shaped nut as a whole, and the nut 24 has a height h that can be inserted into the concave groove 9 from the inlet opening 26 in a state where the nut 24 is laid on its side. Further, the nut 24 inserted in the concave groove 9 is used.
Is fastened by bolts 23, the nut 24 rotates by 54 degrees and is locked to the protruding edge 27 of the concave groove 9.

The surface 28 of the protruding edge 27 facing the inlet opening 26 and the surface of the projection 25 of the L-shaped member 26 corresponding to the surface 28 are both slightly toward the center of the bottom surface of the concave groove 9. Due to the inclination, the projection 25 fits exactly into the inlet opening 26. Therefore, when the bolt 23 is fastened, the L-shaped member 26 is accurately positioned. Further, the contact surface between the inner surface 29 of the protruding edge 27 and the nut 24 is slightly inclined toward the center of the concave groove 9, so that the L-shaped member 6 is firmly fixed to the cross beam 3. You.

When the horizontal girder 3 is fixed to the vertical girder 2, the upper surface of the horizontal girder 3 becomes a flat support surface for supporting the floor plate member 8 forming the cargo bed. The floor plate member 8 made of wood or aluminum alloy is fixed to the cross beam 3 by, for example, a nail 31, a set screw, or a rivet. The upper surface 32 of the floor panel member 8 forms substantially the same plane as the upper surface 33 of the stringer 2, whereby the upper surface 33 of the stringer 2 also constitutes a load supporting surface.

Further, if necessary, a groove 35 is formed in the bottom surface 34 of the cross beam 3, and the web 36 of the horizontal column 7 is configured to receive the end portion in the groove 35. The horizontal support 7 is constituted by an L-shaped member or a T-shaped member, and extends between the stringers 2, and if necessary, a bottom surface 37 of the column 7 is located on the same plane as a bottom surface 38 of the stringer 2. In the embodiment shown, the horizontal support 7 is fixed to the cross beam 3 by a weld 39.

As shown in FIG. 3, the cross beam 3 has a square cross-sectional shape as a whole, and an opening 17 corresponding to the square cross-sectional shape of the cross beam 3 is formed in the web 11 of the vertical beam 2. You. When the opening 17 is formed in the web 11 of the cross beam 2, stress is concentrated at the corner, so that it is unavoidable that the opening 17 becomes a certain defect.

FIG. 4 shows another embodiment of the cross beam 2. The cross girder 3 is characterized in that, as compared with the above-mentioned cross girder 3, its four corners are formed by a large curved portion 40 which is curved so as to cover almost one-fourth of the girder width. By exploring such a configuration, the opening shape of the end of the cross beam 3 is almost circular. The cross beam 3 also has concave grooves 9 on a pair of side surfaces corresponding to each other, and the point that these concave grooves 9 are formed at the same height from the bottom surface of the cross beam 3 is also different from this cross beam. It has three features.

FIG. 5 shows still another embodiment of the cross beam 3. The feature of this cross beam 3 is constituted by a large curved portion 41 in which a pair of corners is curved so as to extend over almost half of the beam width.
The point is that a pair of concave grooves 9 are formed in the other pair of corners of the cross beam 3. As can be seen from the figure, the pair of concave grooves 9 of the cross beam 3 are located substantially on a diagonal line passing through the center of the cross beam 3.

4 and 5, a large curved portion 4
The ratio of the digit widths of 0 and 41 to the digit width is not limited to the above value, but may be different. Thereby, the opening shape of the end of the cross beam 3 becomes different.

A flat support surface 30 is provided at the top of the cross beam 3 in FIGS.
Is formed, and the floor plate member 8 can be supported by the support surface 30. The floor plate member 8 is laid so as to extend in the longitudinal direction of the chassis.

1 to 5 are all constituted by hollow beams, but may be constituted by beams other than the hollow beams.

FIG. 6 shows still another embodiment of the cross beam 3. The feature of the cross beam 3 is that the cross beam 3 is formed of a shape having an S-shaped cross section without searching for the configuration of a hollow beam having a hollow portion therein. In this cross beam 3, a pair of concave grooves 9 are vertically arranged side by side, and the entrance openings of these concave grooves 9 are located on the opposite vertical surfaces of the cross beam 3. This cross beam 3
A flat support surface 30 is also formed at the top of the floor plate, and the floor plate member 8 is supported by the support surface 30. The horizontal girder 3 is S as shown in FIG.
Instead of the cross-sectional shape of a letter, a cross-sectional shape of an E-shape can be used. In this case, the entrance opening of the concave groove 9 is located on the same side surface of the cross beam 3.

A groove (not shown) corresponding to the groove 35 shown in FIG. 3 can be formed at the bottom of the cross beam 3 in FIGS. 4, 5, and 6, respectively.

The transmission of the load in the case where the horizontal support 7 is not provided is performed as follows. That is, the load on the platform composed of the floor plate member 8 is L from the upper part of the vertically extending side wall of the cross beam 3.
It is transmitted to the figure 6 and then to the stringer 2 via bolts 20.

The opening 17 of the web 11 of the girder 2 is formed slightly larger than the cross section of the girder 3.
There is play of about 5 to 1.0mm. Due to the play, it is possible to prevent a change in the load applied to the platform during use of the chassis and a friction between the girder 2 and the horizontal girder 3 due to the twist generated in the chassis.

It is desirable to form at least one concave groove 9 ′ similar to that formed on the cross beam 3 on each of the inner surfaces of the vertical member 4 and the horizontal member 5 constituting the outer frame F. In this manner, as shown in FIG. 1, the vertical member 4 of the outer frame F is fixed to the end of the cross beam 3 via the L-shaped member 6 attached to the concave groove portion 9 '. The vertical member 4 and the horizontal member 5 of F can be similarly connected via an L-shaped member 6 near the joint end of these members 4 and 5.

7 to 9 show an embodiment in which concave members 9 'are formed in the vertical member 4 and the horizontal member 5 of the outer frame F, respectively.

As shown in FIG. 7, three ribs 42 are formed on the inner surface of the vertical member 4 in the longitudinal direction of the vertical member 4.
A pair of concave grooves 9 ', 9' are arranged between them. By forming a pair of concave grooves 9 ', 9', this vertical member 4 can be connected to any of a pair of concave grooves 9, 9 of the cross beam 3 shown in FIGS. become. As shown in FIG. 9, the concave grooves 9 ', 9' of the vertical member 4 and the horizontal member 5 are provided.
Are formed at the same height position, the concave grooves 9 ', 9' of the vertical member 4 and the horizontal member 5 are connected to each other to form one concave groove. A frame 43 extending in the longitudinal direction of both members 4 and 5 is formed on the upper portions of the vertical member 4 and the horizontal member 5, respectively. The edge of the frame 43 is connected to the edge of the floor panel member 8 and forms an edge of a platform for supporting a load.

FIG. 8 is a plan view showing a state where the cross beam 3 is connected to the vertical member 4 of the outer frame F, and shows the position of the L-shaped member 6 in this state.

FIG. 9 shows the end of the vertical member 4 and the horizontal member 5 of the outer frame F.
FIG. 5 is a plan view showing a state in which the ends of the L-shaped members 6 are joined, and shows a position of the L-shaped member 6 in this state.

7 to 9, the L-shaped member 6 has elongated projections 25, 25 formed on the back side of the flanges 19, 22.
Are fitted in the inlet openings 26 'of the corresponding concave grooves 9, 9', and the bolts 23 ', 23 passing through the flanges 19, 22 and the rear side of the inlet openings 27 of the concave grooves 9, 9'. These bolts 2
With nuts 24, 24 ', 24 "screwed into 3', 23,
The vertical member 4 of the outer frame F is connected to the horizontal beam 3 and the horizontal member 5.

As shown in FIGS. 10 and 11, a plurality of ribs formed as an extruded profile and extending on one side of the web 11 of the stringer 2 in the longitudinal direction of the stringer 2 as shown in FIGS. It is desirable to use the column 2 in which 44 are juxtaposed.

The stringer 2 shown in FIG. 10 has two ribs 44 at the same height as the concave groove portion 9 of the stringer 3 in FIG. 4, whereby the stringer 2 is connected to the stringer 3 in FIG. 4. You. Column 2 shown in FIG.
It has three ribs 44 so that it can be connected to the cross beam 3 having concave grooves 9 of different heights shown in FIGS. 3, 5, and 6.

If the stringer 2 having such ribs 44 is used, the projection 25 of the flange 19 of the L-shaped member 6 can be fitted between a pair of adjacent ribs 44. Therefore, the vertical girder 2 and the horizontal girder 3 can be connected by the L-shaped member 6 having such a projection 25. When the projection 25 is fitted between the pair of ribs 44, the load from the platform can be supported to some extent by the lower ribs 44.

That is, the lip 44 of the stringer 2 is formed with the interval and height set so as to support both sides of the projection 25 of the flange 19 of the L-shaped member 6.

By forming the rib 44 on the stringer 2, the flange 19,
An L-shaped member 6 having a projection 25 on 22 can be used for all parts of the chassis. That is, the vertical girder 2 and the horizontal girder 3 can be connected by the common L-shaped member 6, and the vertical girder 4 and the horizontal girder 3 of the outer frame F can be connected, and the vertical girder 4 and the horizontal girder 3 of the outer frame F can be connected. It can also be used for connection with the transverse member 5.

To make the ribs 42, 44 of the stringer 3 applicable on the longitudinal member 4 of the outer frame F and on the longitudinal support means shown in FIGS. 10 and 11, respectively, Rib of girder 3
Obviously, 42,44 must be arranged at an appropriate height with respect to the load bearing surface.

In the undercarriage having the load supporting frame shown in FIG. 1, without the inner frame, and with the stringer 3 in the center, the vertical member 4 of the outer frame F
Perform the function of In such an undercarriage, the vertical member 4 of the outer frame F is formed of an open profile as shown in FIG. 7, and a hollow profile can be used to obtain higher strength. As described above, when the vertical member 4 of the outer frame F fulfills the function of the cross beam 3, one or two concave grooves 9 'are formed on the inner surface of the vertical member 4, and the aforementioned L-shaped member is formed. 6
Can be connected to the cross beam 3.

Even for chassis with an outer frame that supports the load,
Even for chassis with an internal frame that supports the load,
The cross beam having two grooves 9 arranged at different heights as in the embodiment of FIGS. 3, 5 and 6 has two grooves 9 at the same height as in FIG. It has the following advantages as compared with a simple cross beam. That is, the vertical member of the outer frame and the vertical girder at the center can be fixed to the horizontal girder 3 by the L-shaped members acting at two different heights. As a result, the members are more strongly fixed without inclination. You can do it.

FIGS. 12 and 13 show an embodiment of the present invention which is particularly used for attaching the aluminum floor plate member 8 to an aluminum chassis. The floor plate member 8 has a support rib 46 having a leg 47 at an end thereof, and can be fixed in a state where edges are brought into contact with each other by a joint 48 including a tongue piece and a groove for receiving the tongue piece. The joint 48 is configured to be easily fixed to the cross beam 3 by bolts 49, nuts 50, and clamp members 51. To this end, the bolt 49 has a specially shaped head portion, which is configured to engage the leg 47 of the floor panel member 8.
As shown in FIG. 13, a contact surface 53 is formed on one side of the clamp member 51, and is supported by the floor plate member 8 by the contact surface 53. The clamp member 51 has a hole 54 into which the bolt 49 is inserted, and a projecting portion 55 that engages with the edge 27 of the concave groove 9. The protruding portion 55 is formed on the opposite side of the contact surface 53. The attachment of the clamp member 51 is preferably combined with the cross beam 3 having the concave groove 9 at the upper edge. This is another advantage of the cross beam 3 having the concave groove 9 at the corner.

Similarly, both ends of the floor plate member 8 can be attached to the upper ribs 42 of the horizontal member 5 of the outer frame F.

Effects of the Invention The chassis of the present invention has the following features.

Since the undercarriage of the present invention has a configuration in which a plurality of cross beams penetrate a plurality of longitudinal beams, it is possible to reduce the height of the undercarriage and increase the effective loading capacity of luggage mounted on the undercarriage. Can be.

As described below, the decrease in strength of stringers due to the penetration of stringers by stringers can be set freely between adjacent stringers, and the number of stringers used can be arbitrarily selected. The problem is solved by searching for a configuration that can be used.

The chassis of the present invention has a configuration in which the plurality of longitudinal beams, the plurality of lateral beams, and the outer frame are joined with bolts and nuts without using welding, so that no skill is required for assembly,
Its repair is also easy.

When joining the vertical girder and the horizontal girder penetrating this through the L-shaped member and the bolt and the nut,
Since the nut is engaged with and joined to the concave groove formed in the horizontal girder, by displacing the horizontal girder relative to the vertical girder in the direction along the concave groove, the vertical girder is formed. The position of the cross beam relative to the beam can be freely adjusted.

This relationship is the same between the horizontal beam and the vertical member of the outer frame.

In addition, since it is possible to use an aluminum alloy material that is lightweight but does not necessarily pass through welding, it is possible to reduce the weight of the chassis and reduce the weight of each component. Therefore, there is a feature that the handling is easy at the time of assembling or repairing.

Therefore, the chassis of the present invention has the following advantages in its production.

By attaching the L-shaped member in advance, the manufacturing time of the chassis can be reduced.

The supply of pre-manufactured parts becomes possible, and the chassis can be easily assembled without using expensive machinery.

Skill is required to improve the welding quality, but by connecting bolts to the horizontal and vertical beams and the outer frame,
You can always get the same quality.

And when connecting with a bolt, the outer frame can be anodized.

[Brief description of the drawings]

FIG. 1 is a partial perspective view of a chassis having an inner frame of the present invention, FIG. 2 is a cross-sectional view of a cross section of a vertical girder at a joint portion between a horizontal girder and a vertical girder, and FIG. FIG. 4 is a cross-sectional view of the cross-section of the cross beam at the joint between the beam and the vertical beam, FIG. 4 to FIG. 6 are diagrams showing the cross-sectional shape of another embodiment of the cross beam, FIG. 8 is a plan view of FIG. 7, FIG. 9 is a plan view of a joint between a vertical member and a horizontal member of the outer frame, FIG. 10, FIG. The figure is a cross-sectional view of another embodiment of the stringer, and FIGS. 12 and 13 are cross-sectional views of the joint between the aluminum floor plate member and the cross beam. DESCRIPTION OF SYMBOLS 1 ... Undercarriage 2 ... Vertical girder 3 ... Horizontal girder 4 ... Vertical member 5 ... Horizontal member 6 ... L-shaped member 8 ... Floor plate member 9 ... Recessed groove 10 ... Upper T-shaped member 12 ... … Lower T-shaped member 13… Web 17… Opening 19, 22… Flange 25, 55… Protrusion 26… Inlet opening 31… Nail 35… Groove 36… Web 42, 44, 46… … Rib 51 …… Clamp member

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Manfred Wootz, Zehr-8910, Switzerland, Forntern, Pründhofstrasse 19

Claims (12)

(57) [Claims] 1. A plurality of stringers (2), a plurality of cross beams (3) penetrating the plurality of stringers, and an outer frame (F) surrounding the plurality of column beams and the plurality of cross beams. ), And
In a vehicle undercarriage formed of an aluminum alloy material, at least one concave groove portion (9) is formed in each of the plurality of cross beams (3), and the plurality of cross beams (3) includes a plurality of cross beams. An L-shaped member (6) is fixed to the plurality of vertical beams (2) and the plurality of vertical members (4) constituting the outer frame (F), and one flange of each of the L-shaped members (6) (22) a nut (24) engaging with the side of the cross beam (3) on the back side of the edge (27) of the opening of the concave groove (9), and a screw on the nut (24). The other flange (19) of the predetermined L-shaped member (6) of the L-shaped member (6) is fixed by the mating bolt (23) and the web (11) of the stringer (2). Is fixed by a bolt (20) and a nut (21), and the remaining L-shaped member (6) is L-shaped member (6)
The other flange (19) engages with the vertical member (4) on the back side of the edge (27) of the opening of the concave groove (9) formed in the vertical member (4). Nut (24 '),
A vehicle underbody fixed by a bolt (23 ') screwed into the nut (24'). 2. A chassis according to claim 1, wherein said cross beam (3) has the form of a hollow beam, and said cross beam (3) has a pair of concave grooves (9, 9). ) Is formed, and the pair of concave grooves (9, 9) are formed at diagonal corners of a cross section of the cross beam (3), or both side surfaces of the cross beam (3). Formed at the same height of
The undercarriage. 3. The undercarriage according to claim 1, wherein said cross beam (3) has a shape of a transverse cross section as a whole.
The undercarriage having an open or E-shaped open cross section. 4. The undercarriage according to claim 2, wherein the upper surface of said cross beam (3) has a form of a flat support surface (30) for supporting a plurality of floor plate members (8). None, the flat support surface (30) forms only a part of the entire width of the cross beam (3), and the cross beam (3) is provided on one side or the other side of the flat support surface (30). The undercarriage, wherein a continuous curved portion (40, 41) is formed on a vertical side wall of the undercarriage. 5. The undercarriage according to claim 2, wherein a groove (35) is formed in a bottom surface (34) of said cross beam (3), and said groove (35) is formed by said plurality of vertical members. The undercarriage, wherein the undercarriage is configured to receive an end of a lateral strut (7) extending between the spar (2). 6. The undercarriage according to claim 1, wherein a plurality of longitudinal ribs (44) are provided on the web of the plurality of stringers (2). The plurality of longitudinal ribs (44) are provided with grooves (45) for positioning one flange of the L-shaped member (6).
Forming the undercarriage. 7. The undercarriage according to claim 1, wherein the vertical member (4) of the outer frame (F) is reinforced to support a load. The undercarriage, which is constituted by a shaped member. 8. The undercarriage according to claim 1, wherein said nut (2)
4, 24 ') are in the form of parallelogram clamps,
The undercarriage, wherein a height (h) of the clamp member is smaller than a width (b) of an inlet opening (26) of the concave groove (9). 9. The undercarriage according to claim 1, wherein said stringer (2) comprises:
Said web is a relatively tall upper web (11)
And a lower web (13) that is relatively short, said lower web (13) having a groove (15),
The undercarriage is adapted to receive an end of the upper web (11) and change the height of the stringer (2) over its entire length. 10. The undercarriage according to claim 1, wherein said web (11) of said stringer (2) penetrates said cross beam (3). The undercarriage is formed with a plurality of openings (17) for making the openings, and the area of the openings (17) is formed slightly larger than the cross section of the cross beam (3). 11. The undercarriage according to claim 1, wherein said outer frame (F) is provided with said vertical member (4),
A horizontal member (5) joined to the vertical member (4), wherein the vertical member (4) and the horizontal member (5) are joined via an L-shaped member (6); The member (6) has a pair of flanges (19, 22) extending at an angle to each other, and the flanges (19, 22) of the L-shaped member (6) are formed in the concave grooves (9 '). A nut (24 ", 24") and a flange (19, 22) located therein and engaging behind the edge of the opening of the concave groove (9 ');
And the chassis fixed to the vertical member (4) and the horizontal member (5) by bolts (23 ", 23") screwed to the nuts (24 ", 24"). . 12. The chassis according to claim 11, wherein said nuts (24 ", 24") have a parallelogram configuration.