JP3483402B2 - Lorry cabin frame structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame structure for a cargo automobile cabin such as a truck, which is formed by welding a rectangular tubular shape member made of aluminum or aluminum alloy (hereinafter collectively referred to as aluminum material). Regarding

[0002]

2. Description of the Related Art Conventionally, automobile bodies such as trucks and vehicle bodies such as transport machines are reinforced by press-forming steel sheet ends which are joined by resistance spot welding.
The monocoque structure assembled in this manner is a general vehicle body structure such as a truck.

However, although this method has the advantage that the assembly can be easily automated, it has many overlapping portions, there are considerable wasteful portions in the structure formation, it is not slim, and the shape of the molding member is complicated. However, there is a disadvantage that the weight also increases.

On the other hand, if the butt welding is performed by arc welding and beam welding, the structure becomes slim, but the welding quality is greatly affected by the butt precision of the members before welding. For example, if a gap is formed between the members, the welding quality will be significantly reduced. Therefore, a jig for pressing the members to hold them in the assembled state is required, and the members themselves need to be machined with high precision. Therefore,
Automation of assembly is difficult.

Recently, in order to reduce the weight of the vehicle body, attempts have been made to manufacture the vehicle body from an aluminum alloy material. In this case, the aluminum material has a low spot weldability, and in the monocoque structure, it is necessary to weld several thousand points, but in that case, there is a disadvantage that the electrode is consumed greatly. In addition, the formability of the plate material is worse with the aluminum material than with the steel material.

Therefore, there has been proposed a space frame structure in which a vehicle body such as an automobile such as a truck and a transportation machine is supported by a hollow pipe-shaped frame. FIG. 32 is a schematic diagram showing a space frame structure proposed to be applied to a general track. As shown in FIG. 32, a rectangular tubular shaped material 61 made of aluminum is assembled into a shape of a cabin of a truck, and the rectangular tubular shapes 61 are welded to each other and fixed to each other. As a result, a so-called space frame structure is formed, and the structural plate is attached so as to cover the space frame 60 to complete the automobile body.

However, for passenger cars, although a space frame structure is known, a space frame structure made of an aluminum material has only been proposed as a concept for a truck cabin, and has not yet been put into practical use. That is, the conventional truck cabin having the above-described monocoque structure is the current state of the art.

[0008]

However, the monocoque structure using this steel plate has the following drawbacks. In the case of a truck collision,
In the case of a frontal collision with a short passenger car, the cabin installed on the chassis is not significantly damaged, and the chassis frame, which is the main frame of the truck, absorbs the collision. There is little need to do it. However, in a collision between trucks or between a truck and an electric pole or a building, a collision force directly acts on the cabin, but the conventional truck cabin considers the safety against such a collision in which the driver's seat is pressed. It's not what you did. Since the cabin originally does not need to support power components such as the engine and suspension, it is a relatively weak part in terms of strength.At present, trucks already have a front bonnet for storing engines such as passenger cars due to their structure. Those that do not do this are the mainstream, and the collision energy cannot be absorbed by this bonnet, so there is the drawback that collision safety is low. Recently, there is an increasing demand for improvement in safety against such a collision between trucks.

Further, in trucks, regulations for overloading have been strengthened, and from this viewpoint, there is a demand for weight reduction of the entire vehicle. For this reason, it is desired to use an aluminum material in the truck cabin, but as described above, there are various drawbacks when an aluminum material is used to manufacture a cabin having a monocoque structure.

Conventionally, a space frame structure has been realized in passenger cars. However, when assembling a vehicle body frame of an aluminum rectangular tubular member, a knot member manufactured by casting and forging is used. A method of joining the shape members together is adopted (Japanese Patent Laid-Open No. 60-1353).
No. 75).

However, in this conventional technique,
Since the shape of the knot member is complicated and the number of welding points and the number of parts are increased, there is a drawback that the manufacturing cost is increased. Further, since the knot member is used, the weight is increased.

Therefore, the applicant of the present application has proposed a method for manufacturing a welded structure in which the shape members are directly welded to each other without using a knot member (unpublished: Japanese Patent Application No. 8-143152).
In this technology, in order to obtain a good weld in the state where the shape members are directly welded and joined together, the end portions of the shape members are connected at a joint angle (when the shape members are Depending on the angle to make), it is cut diagonally and abutted.

However, in the case of diagonally cutting and joining the end portions of the shape members, there are the following operational problems. First, when assembling a frame-shaped frame, etc., set them by abutting at a predetermined angle and fix them with clamps or temporarily fix by welding, but it is difficult for the coupling angle to match the predetermined angle, and the abutting part is likely to shift . For this reason, there is a drawback that the work takes time and labor. Therefore, the productivity is low and the manufacturing cost is increased.

As described above, the truck cabin does not have a front bonnet that functions as a collision energy absorber unlike a passenger car, and therefore the cabin structure itself needs to have collision safety, and weight reduction is strongly demanded. , Because it is necessary to avoid further increase in manufacturing cost,
A known space frame structure cannot be directly applied to a passenger car. Although the concept of the space frame structure itself has been proposed for trucks, it has not yet been put to practical use.

The present invention has been made in view of the above problems, and has an energy absorbing property itself to provide excellent collision safety, and without using a knot member,
The workability is improved by improving the setting properties of the profile during welding, the deformation of the profiles due to the influence of welding heat can be prevented and the dimensional accuracy can be improved, and the weight and manufacturing cost can be reduced. At the same time, it is an object of the present invention to provide a frame structure for a freight vehicle cabin having excellent rigidity of the entire frame.

[0016]

A frame structure for a freight vehicle cabin according to the present invention is a frame structure for a freight vehicle cabin obtained by welding and joining a plurality of aluminum or aluminum alloy profile members. A front frame, a pair of side frames on both sides of the cabin, a floor frame of the cabin floor, a rear frame of the cabin rear, and a ceiling frame constituting a cabin ceiling. The frame includes a first front cross member connected between front ends of the pair of side frames;
A pair of first front coupling members fixed to the front ends of the pair of side frames and extending in the cabin height direction, and parallel to the first front cross member in front of the first front cross member. And a second front cross member whose both ends are respectively connected to the pair of first front coupling members, and a second front cross member which is separated from the second front cross member in the height direction. A third front cross member which is arranged in parallel with the member and whose both ends are respectively connected to the pair of first front coupling members; and a first front cross member which extends in the front-rear direction and a second front cross member. A bracket that connects the front cross member,
A second front connecting member that extends obliquely forward from the second front cross member to the third front cross member to connect them together is provided.

In the present invention, a front frame is provided at the front of the cabin. In this front frame, first to third front cross members extending in the width direction of the vehicle body are arranged so as to be separated from each other in the front-rear direction, and the first front cross member and the second front cross member are mutually connected by a bracket. Further, the second front cross member and the third front cross member are connected by the second front connecting member, and both ends of the second front cross member and the third front cross member are connected to the first front cross member. Since the second front cross member and the third front cross member are connected to the front connecting member, they function as bumpers separately from the normal bumper provided outside the vehicle body during a collision.
The collision energy is absorbed by the deformation of the bracket. Therefore, even in a truck without a hood such as a passenger car, the collision energy directly acting on the cabin can be sufficiently absorbed, and the collision safety is extremely high.

Further, according to a second aspect of the present invention, the front frame is arranged such that the front frame is arranged in front of the first front cross member in parallel with the third front cross member. In the case of having the above, it is possible to further improve the collision safety and to increase the rigidity of the entire cabin.

Further, according to a third aspect of the present invention, the side frame is provided with a frame-shaped portion formed along the contour shapes of the door frame and the wheels of the cabin and the frame-shaped portion in the height direction. A reinforcing member, the frame-shaped portion has front and rear side members extending in the vehicle front-rear direction, and upper and lower side members extending in the vehicle body height direction. At least the front and rear side members have a rectangular cross section. In the case of the tubular shape member, the rigidity of the cabin can be increased, whereby the deformation of the cabin at the time of collision can be suppressed, and the space for the occupant can be secured.

This is because the floor frame is provided between one or a plurality of floor cross members connecting the pair of side frames and the third cross member of the rear frame and the front frame. And one or a plurality of floor side members for connecting the two side frames, the rear frame has one or a plurality of rear cross members for connecting between the rear end portions of the pair of side frames. The same applies to the case where the ceiling frame has a ceiling cross member that connects between the upper ends of the pair of side frames.

In particular, the ceiling frame can prevent the cabin from being broken when it falls. In addition, the rear frame can prevent the deformation of the cabin against a collision from the rear or the jumping out of the luggage, thereby improving safety.

Then, the members are made of a rectangular tube-shaped member, and the members are positioned and welded to each other by a joining member to improve the setting workability of each member at the time of welding and to join the members. The accuracy can be improved, and since no knot member is used, the increase in weight is extremely small and the manufacturing cost is low.

In this case, as the joining member, specifically, among the members, those members whose end faces are butted against each other and the butted portions are welded to each other are positioned by the butted portion joining member. The members for welding are joined by welding, and the member for joining butt portions has an angle determining portion that follows the outer surface or the inner surface of the side plates that intersect at an angle of 180 ° or less when the members are butted at a predetermined angle, First and second parts that branch from the angle determining part and extend and extend with the angle determining part sandwiching the member.
It is preferable to have a locking part. The joint can be reinforced by having the connecting portion that connects the ends of the first and second locking portions.

On the other hand, among the members, members to be joined in an L shape are positioned and welded to each other by an L-shaped joining member, and the L-shaped joining member is attached from the bottom surface and both side surfaces thereof. Having a plurality of fitting portions which have a U-shaped cross section and fit the shape members, and at least two of the fitting portions have a bottom surface and both side surfaces parallel to each other, or At least two of the fitting portions have one bottom surface and the other bottom surface orthogonal to each other, one side surface and the other side surface orthogonal to each other, one bottom surface and the other side surface are parallel,
It is preferable that one side surface is parallel to the other bottom surface.

Since all of the above-mentioned joining members have a uniform cross section, they can be manufactured at low cost by extrusion molding.

The bracket has a first fitting portion having a U-shaped cross section for fitting the first front cross member and a second fitting having a U-shaped cross section for fitting the second front cross member. And a beam connecting the first and second fitting portions, wherein the first and second fitting portions are mechanically joined to the first and second front cross members by rivets, respectively. Therefore, it is preferable that the beam has a softened portion formed by spot welding.

As described above, since the bracket is connected to the front cross member by the first and second fitting portions, the bracket itself can be manufactured by extrusion molding, so that the manufacturing cost is reduced, and the positioning and the assembling property are reduced. Is excellent. Further, since the bracket and the front cross member are not welded but mechanically joined by a rivet, the joining portion is not affected by welding heat and has sufficient strength. Therefore, at the time of a collision, the beam is deformed at the beam portion of the bracket, not at the joint portion, and the collision energy can be absorbed. This is because by forming spot-like softened portions on the beam by spot welding, the deformation of only the beam can be further promoted and collision safety can be improved.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.
A detailed description will be given with reference to the accompanying drawings. FIG. 1 is a perspective view showing a frame structure 1 of a truck cabin of the present invention. The frame structure 1 is obtained by welding and joining a plurality of aluminum or aluminum alloy profiles. This shape member is a cylindrical member having a square or a cross section. The frame structure 1 includes a front frame 10 at the front of the cabin and a pair of side frames 2 at both sides of the cabin.
0, a floor frame 30 of the cabin floor, a rear frame 40 at the rear of the cabin, and a ceiling frame 50 forming a cabin ceiling.

In the front frame 10, a first front cross member is connected between the front ends of the pair of side frames 20, and the cabin height is increased at the front ends of the pair of side frames 20. A pair of first front coupling members 12 extending in the longitudinal direction are fixed to each other. In front of the first front cross member 11, a second parallel to the first front cross member 11 is provided.
A front cross member 13 is arranged, and its both ends are connected to a pair of first front coupling members 12. The third front cross member 14 is the second front cross member 13.
From the second front cross member 13 in the vehicle body height direction.
Are arranged in parallel with each other, and both ends thereof are connected to the pair of first front coupling members 12. The bracket 15 extends in the vehicle front-rear direction and connects the first front cross member 11 and the second front cross member 13. In addition, the pair of second front connecting members 16 are connected to each other by the second front cross member 13
From the first to the third front cross member 14 to connect the two, and each of the second front coupling members 16 includes a member 16a extending obliquely downward and a member 1 extending vertically.
6b is connected.

Further, as the front frame 10,
One or more fourth front cross members (not shown) may be arranged in parallel with the third front cross member and in front of the first front cross member.

The side frame 20 includes a frame-shaped portion 21 formed along the contours of the door frame and wheels of the cabin, and the reinforcing member 2 suspended in the frame-shaped portion 21 in the height direction.
2 and. The frame-shaped portion 21 has front and rear side members 25, 26, 27 extending in the vehicle front-rear direction, roof side members 23, 24, and upper and lower side members 28, 29 extending in the vehicle height direction. Front and rear side members 2
5, 26, 27 may have a cross-section of a sun shape in order to enhance collision safety, if necessary.

The floor frame 30 connects the two floor cross members 31, 32 connecting between the pair of side frames, and the rear frame 40 and the third cross member 14 of the front frame 10. Two floor side members 33, 3
4 and. By making the cross-sectional shape of the floor side members 33, 34 into a day shape, the collision safety of the front part is dramatically improved.

The rear frame 40 has three rear cross members 4 connecting the rear ends of the pair of side frames 20.
1, 42, 43, rear upper and lower members 44, 45, 46, 47 connecting the rear cross members 41, 42, and upper and lower cross members 48 connecting the rear cross members 42, 43.

The ceiling frame 50 connects the pair of members 23 and 24 at the upper ends of the pair of side frames 20 to each other 3
The book includes ceiling cross members 51, 52, and 53.

These members are rectangular tubular members manufactured by extrusion molding, and the members are positioned and welded to each other by a joining member. Also, the members 13, 14, 24, 26, 33, 3451, 52, 5
After extrusion molding, 3 is bent by, for example, a multi-bender.

Next, the joining member will be specifically described. FIG. 2 is a view showing a first embodiment of the joining member,
(A) is a perspective view and (b) is a sectional view. This joining member is used at the joining portion A between the member 16a and the member 16b shown in FIG. Members 16a, 16b
The first aluminum material forming material 101 having a rectangular tube shape
The second aluminum shaping material 102 is cut with its end face inclined in the longitudinal direction. Then, when the two shape members 101 and 102 are butted at their end faces, the shape member 10
1, 102 intersect at a predetermined angle.

The joining member 103 of this embodiment has a band-plate-shaped angle determining portion 104 bent at the coupling angle, and first and second locking portions extending from the angle determining portion 104 toward both ends. And parts 105 and 106. The angle determining portion 104 has a surface that is applied to the outer surface of the side plates of the shape members 101 and 102 that intersect at an angle of 180 ° or less, that is, the outer surface of the inner angle side plate of the shape member. On the other hand, each locking portion 105, 10
6 is an L shape from the angle determining unit 104, and the angle determining unit 1
04 extends toward both ends and has a surface parallel to the angle determining portion 104. Then, the ends of the inner corner side plates of the shape members 101 and 102 are fitted in the gaps between the locking portions 105 and 106 and the angle determining portion 104.

Using the joining member 103 thus constructed, as shown in FIG. 2, the butt ends of the profile members 101 and 102 are fitted into the engaging portions 105 and 106 of the joining member 103. As a result, the shape members 101 and 102 are arranged such that their coupling angles match the predetermined angles. Therefore, the butt lines on both side surfaces of the shape members 101 and 102 are welded to the butt lines on the outer corner side. On the inner corner side of the shape members 101 and 102, the four edge portions of the angle determining portion 104 of the joining member 103 and the outer surfaces of the inner angle side plates of the shape members 101 and 102 are welded and joined. As a result, the shape members 101 and 102 are joined at a predetermined angle.

In the present embodiment, by using the joining member 103, even if the end faces of the shape members 101 and 102 are inclined with respect to the longitudinal direction thereof, both can be easily positioned, and It is possible to match the coupling angle between the two with a predetermined angle with high accuracy. Moreover, this setting work is extremely easy. In addition, the profile 101,
Since the inner-angle side plate of 102 is supported by the joining member 103, the angle formed by the shape members 101 and 102 does not change to the inner-angle side during welding. In addition, the internal corner side portion of the shape member does not require conventional fillet welding, and this portion does not require the angle determining portion 104 of the joining member 103.
Since the edge portion and the shape member are welded to each other, it is possible to prevent a locally weak portion from being generated, thereby improving the strength of the joint portion.

Next, a second embodiment of the present invention will be described with reference to the sectional view of FIG. 3 and the plan view of FIG. The joining member 107 of the present embodiment is also used for the joining portion A, and includes the angle determining portion 108 having the portions 108a and 108b that follow the inner surfaces of the inner corner side plates of the shape members 101 and 102, and the copying portions 108a and 108b. Has first and second locking portions 109 and 110 extending in the longitudinal direction of the joining member 107. The joining member 107 according to the present embodiment has the copying portion 10
An inner plate 108c connecting between 8a and 108b, an outer plate 108d parallel to the inner plate 108c, and the inner plate 1
08c and the outer side plate 108d, the connecting plate 108e which connects the central part, the copy portions 108a and 108b, and the outer side plate 1
It has connecting plates 108f, 108g and connecting plates 108h, 108i for connecting with 08d.

In this embodiment, the profile members 101 and 102 are used.
The joint end of the side plate on the inner angle side of the contacting portion 108a, 108b is brought into contact with the inner surface of the side plate on the inner angle side, and the locking portion 109,
It fits in the gap between 110 and the copy portions 108a and 108b. FIG. 5 shows a member 1 for joining the shape members 101 and 102.
It is a figure which shows the state connected using 07. As a result, the shape members 101 and 102 are arranged at a predetermined coupling angle. After that, the edges of the locking portions 109 and 110 and the profile 1
The inner side plates of 01 and 102 are joined by welding, and the joining lines of both side plates of the shape members 101 and 102 and the outer side plates are joined by welding.

In this embodiment, the angle determining portion 108 comes into contact with the inner surfaces of the inner corner side plates of the profiles 101 and 102 and follows them. In this case, the copying portion 10 of the angle determining portion 108
Since the connecting plates 108f, 108g and the connecting plates 108h, 108i are vertically fixed to the back surfaces of the connecting plates 108f, 108g, 108h, 108i, the connecting plates 108f, 108g, 108h, 108i are fixed to the outer plate 108d together with the connecting plate 108e. The rigidity of the angle determining portion 108 of this embodiment is high. Therefore, when affected by heat during welding, the deformation is prevented.

FIG. 7 shows a welded portion in the case of the embodiment shown in FIG. In the welded portion 111, the side plate of the shape member is softened by being affected by heat, and the softened portion 112 is likely to occur. However, as in this embodiment shown in FIGS. 3 to 5, the angle determining unit 1
If 08 has a highly rigid structure, the joining member 107
As it is reinforced and becomes difficult to deform,
As shown in, the heat of the welded portion 111 escapes via the connecting plates 108f to 108i, the heat-affected zone for the shape members 101 and 102 becomes small, and its softening is prevented. It goes without saying that this embodiment also has the same effects as the embodiment shown in FIG.

Next, a third embodiment of the present invention will be described with reference to FIGS. The joining member of this embodiment includes a joining portion B between the member 23 and the member 29 and the member 2.
As in the joint B between the member 9 and the member 25, the rectangular tubular member is used in the joint that intersects vertically. 8 is a sectional view, FIG.
FIG. 10 is a side view, and FIG. 10 is a view showing a state in which the shape members are joined. In FIGS. 8 to 10, those having the same functions as those in FIGS. 3 to 5 are denoted by the same reference numerals and detailed description thereof will be omitted. . In this embodiment, the shape members 101 and 102 intersect at 90 °. In the joining member 113 of this embodiment, the inner plate 108c of the angle determining portion 108 and the outer plate 108d are bent vertically.

The joining member 113 of this embodiment, which is constructed in this way, also has the shape members 101 and 102 as in the second embodiment.
Can be easily positioned, deformation during welding can be reliably prevented, and the heat effect of the profile can be avoided.

The joining member of each of the above embodiments is shown in FIGS.
As shown in FIG. 8, the cross-sectional shape is uniform, and therefore, it can be manufactured by extrusion processing and cutting processing, so that the manufacturing cost of the welded structure is not significantly increased by using this joining member.

In the joining member shown in each of these embodiments, the shape members can be joined at a predetermined design joining angle, and the setting work is easy. Further, in the present embodiment, since the joining member and the inner corner side plate of the shape member are welded and joined, it is possible to avoid the welding of the inner corner side portion of the shape member which was conventionally performed by fillet welding. It is possible to prevent the connection angle between the shape members from changing during welding. Further, by avoiding this fillet welding, it is possible to avoid locally forming a weak portion in the structure, and as a result, it is possible to improve the strength of the entire joint. Further, as the structure of the angle determining portion, a high rigidity structure provided with a connecting plate or the like is provided, and by reinforcing the joining member, it is possible to prevent softening of the profile due to the influence of welding heat.

FIG. 11 is a sectional view showing a fourth embodiment of the joining member, FIG. 12 is a side view thereof, and FIG. 13 is a front view showing a state in which the shape members are connected by the joining member of this embodiment. A rectangular tubular first aluminum shaped material 201 and a second aluminum shaped material 202 are cut with their end faces inclined in the longitudinal direction. And both the shape members 201 and 20
When the two end faces are abutted with each other, the shape members 201 and 202 intersect each other at a predetermined angle (90 ° in the illustrated example). This predetermined angle is the bond angle. And the shape members 201, 2
The joining member 211 of the present embodiment is attached to the inner side plate of 02. The inner side plates are the shape members 201, 202.
Is a side plate on the side intersecting at an angle of 180 ° or less.

The joining member 211 of this embodiment has an angle determining portion 208 that bends at the above-described coupling angle, and the angle determining portion 208 is the portion 208a, 208b that follows the inner surface of the inner corner side plate of the shape members 201, 202. Have. The angle determining portion 208 connects the copying portions 208a and 208b to each other, and an inner plate 208c that is bent at a central portion of 90 °, and an outer plate 208 that is also parallel to the inner plate 208c and is bent at 90 °.
d, a connecting plate 208e that connects the inner plate 208c and the outer plate 208d at a central bent portion, connecting plates 208f and 208g that connect the copying parts 208a and 208b to the outer plate 208d, and a connecting plate 208h. , 208i
Have and.

The first and second locking portions 209 and 210 of the joining member 211 are the inner plate 2 of the angle determining portion 208.
The first and second locking portions 209 and 210 extending from 08c to the tip end side in parallel with the copying portions 208a and 208b.
Have. That is, the locking portions 209 and 210 extend from the inner side plate 208c of the angle determining portion 8 and extend toward both end portions of the angle determining portion 208, and serve as copy portions 208a and 208b of the angle determining portion 8. It has parallel surfaces. Then, in the gap between the locking portions 209, 210 and the copying portions 208a, 208b of the angle determining portion 208, the shape members 201, 2 are formed.
The end of the inner side plate of 02 is fitted.

Further, the tips of the engaging portions 209 and 210 are connected to each other by a connecting plate 212. Therefore, the connecting plate 212 intersects the shape members 201 and 202 at an angle of 45 °. The central portion of the connecting plate 212 and the inner plate 208c
The second connecting plate 213 is connected to the central bent part of the connecting plate 208 by the second connecting plate 213.
It is located on the extension of e.

Using the joining member 211 thus constructed, as shown in FIG. 13, the inner corner side plates at the abutting ends of the shape members 201 and 202 are inserted into the engaging portions 209 and 210 of the joining member 211. Fit in. That is, the shape members 201, 2
The joint end portion of the side plate on the inner angle side of 02 is fitted into the gap between the locking portions 209, 210 and the copy portions 208a, 208b by bringing the copying portions 208a, 208b into contact with the inner surface of the inner side plate. . As a result, the shape members 201 and 202 are arranged such that their connecting angles match the predetermined angles. Therefore, the butt lines on both side surfaces of the shape members 201 and 202 are welded to the butt lines on the outer corner side. Also, the shape members 201, 20
On the inner corner side of 2, the edge portions of the first and second locking portions 209 and 210 of the joining member 211 and the shape members 201 and 20.
2 is welded to the outer surface of the side plate on the inner corner side. This allows
The shape members 201 and 202 are joined at a predetermined angle.

In this embodiment, by using the joining member 211, even if the end faces of the shape members 201 and 202 are inclined with respect to the longitudinal direction thereof, both can be easily positioned, and It is possible to match the coupling angle between the two with a predetermined angle with high accuracy. Moreover, this setting work is extremely easy. In addition, the profile 201,
Since the inner corner side plate of 202 is supported by the joining member 211, the angle formed by the shape members 201 and 202 does not change to the inner corner side during welding. Further, as for the inner corner side portion of the shape member, fillet welding as in the conventional case is not necessary, and this portion is the angle determining portion 208 of the joining member 211.
Since the edge portions of and are welded and joined to the shape members 201 and 202, it is possible to prevent a locally weak portion from occurring, and thereby to improve the strength of the joint portion.

Further, in this embodiment, the angle determining unit 2
08 contacts the inner surface of the inner side wall of each of the shape members 201 and 202, and follows this. In this case, the connecting plates 208f and 20f are provided on the back surfaces of the copying portions 208a and 208b of the angle determining portion 208.
8g and the connecting plates 208h, 208i are fixed vertically,
Furthermore, each connecting plate 208f, 208g, 208h, 208i
Is fixed to the outer plate 208d together with the connecting plate 208e, the rigidity of the angle determining portion 208 of this embodiment is high.
Then, the angle determining part 208 is provided with the locking parts 209, 210.
It functions as a backing material at the time of welding joining between the shape members 201 and 202. As described above, the angle determining portion 20 having high rigidity
Since 8 functions as a backing material, the shape members 201 and 202 are prevented from being deformed when they are affected by heat during welding.

Further, in this embodiment, the first and second
The connecting plate 212 connects the ends of the locking portions 209 and 210, and the connecting plate 213 connects the connecting plate 212 and the inner plate 208c. And this connecting plate 21
Since both edge portions of 2 are welded to the shape members 201 and 202, these connecting plates 212 and 213 form the shape members 201 and 2 respectively.
It functions as a reinforcing material for the joint portion of 02.

Therefore, the connecting member 211 of this embodiment is
Not only facilitates setting of the shape members 201 and 202, but also serves as a reinforcing member for the joint portion, and the rigidity of the angle determining portion 208 is high.
The bonding strength of No. 02 is remarkably increased.

The joining member 211 of the above embodiment is
As shown in FIG. 11, the cross-sectional shape is uniform, and therefore it can be manufactured by extrusion processing and cutting processing. Therefore, the manufacturing cost of the welded structure is not significantly increased by using this joining member. .

In the above embodiment, in the joining member 211, the angle determining portion 208 follows the inner surface of the inner corner side plate of the shape members 201 and 202, and the first and second locking portions 209 and 2 are provided.
It has a structure in which 10 contacts the outer surface. Therefore, it is the locking portion 2 that is exposed to the outside of the shape members 201 and 202.
09 and 210, and the angle determining portion 208 is the shape member 20.
It is inside 1, 202.

However, the present invention is not limited to the above-mentioned embodiment, and the copying portions 208a and 208b of the angle determining portion 208 are formed by the profile member 2.
The shape may follow the outer surface of the inner-angle-side side plates 01 and 202 so that the locking portion contacts the inner surface. However, in this case, the connecting plates 209 and 210 functioning as a reinforcing member do not connect the ends of the locking portions 209 and 210, but
The shapes of the angle determining portions exposed to the outside of the shape members 201 and 202 are connected to each other. Thereby, when the end portion of the angle determining portion and the outer surface of the shape member are welded and joined,
The connecting plate to be made to function as the reinforcing member is directly welded to the outer surface of the inner-angle side plate of the shape member, and thus sufficiently functions as the reinforcing member. In any case, the connecting plate as the reinforcing member is arranged on the inner corner side of the profile.

Reinforcing members (connecting plates 209, 210)
The shape and size of the can be determined according to the required degree of reinforcement.

In this embodiment, since the connecting portion is provided as a reinforcing member on the inner corner side of the shape member, this connecting portion has a function of reinforcing the joint portion of the shape members. Therefore, according to the present embodiment, it is possible to increase the strength of the joint portion of the shape members, by adjusting the degree of reinforcement, such as the length of the connecting portion,
It can be designed arbitrarily, and the degree of freedom in frame design is improved.

When the joining member of the above embodiment is used, it is preferable to use the shape member 201 (202) having the following structure. FIG. 14 is a perspective view showing the shape member 201 (202), and FIG. 15 is a plan view thereof. The shape member 201 (202) has an end face 22.
5 is inclined, and the protruding side plate 222 and this side plate 2
It is configured by a side plate 221 facing in parallel with the side plate 22, and a pair of side plates 223 and 224 connecting the side plate 221 and the side plate 222. The tip edges 225 of the side plates 223 and 224 are linearly inclined from the side plate 221 side toward the side plate 222 side. Thus, the shape member 201 (20
In 2), a notch 226 is formed at the end of the side plate 221. This notch 226 is used for attaching the end mill to the side plate 22.
It can be formed by moving the end plate 1 in the longitudinal direction of the side plate 221. Thus, the cutout 2
If 26 is formed with an end mill, the notch 226 can be formed very easily and quickly. In addition, when the notch 226 is formed by the end mill, the notch 22
The end edge of 6 is curved with the same radius as the radius of the end mill.

When setting the shape members 201 and 202 using the joining member 211 configured as described above, first, the inner corner side plate 221 of the abutting ends of the shape members 201 and 202 is joined to the joining member. 211 locking portions 209, 210
Fit inside. In this case, the profile member 20 is deeply inserted until the deepest part of the notch 226 comes close to the base end part of the locking part 209.
1, 202 are fitted in the locking portions 209, 210. That is, the side plates 221 on the inner corner side of the shape members 201, 202 are formed by the portions 208a, 208b that follow the inner surface of the inner corner side plate 221.
Are contacted with each other and the notch 226 of the inner side plate 221 is positioned in the region from the branch portion of the locking portions 209, 210 of the joining member 211 to the central bent portion of the inner side plate 8c, and the locking portion 209, 210 and copying portions 208a, 2
It fits in the gap between 08b. As a result, the profile 20
1, 202 are arranged such that their coupling angles match a predetermined angle.

Next, a joining member according to the fifth embodiment will be described. 16 is a front view showing this embodiment, FIG. 17 is a plan view thereof, FIG. 18 is a left side view thereof, and FIG.
9 is a sectional view taken along the line AA of FIG. In the present embodiment, one member is joined to the side surface of the other member, such as the joint C between the member 22 and the member 26 and the joint C between the member 51 and the member 24 shown in FIG. It is effective in some cases. Each of the shape members 301, 302, and 303 has a rectangular tube shape, and in particular, the shape member 301 has a central plate 301a connecting the side surfaces at the center of the cross section so that the cross section has a "day" shape. The sections 302 and 303 have a square cross section. Further, the shape member 301 has a rectangular hole 301b formed in its upper plate, and the shape member 3 is placed in the hole 301b.
03 is inserted.

The joining member 309 of this embodiment has two fitting portions 310 and 316. The bottom plate 311 has the fitting portion 31.
It also serves as the bottom surface of 0 and the bottom surface of the fitting portion 316. And
Side plates 312, 313 and side plates 314, 315 extend from both ends of the bottom plate 311 perpendicularly to the front surface and the back surface thereof, respectively. The side plate 312 and the side plate 314 are on the same surface, and the side plate 313 and the side plate 315 are on the same surface. The side plates 312 and 314 are parallel to the side plates 313 and 315. Thus, the joining member 309 has a shape in which the fitting portions 310 and 316 having a U-shaped cross section are arranged back to back, and the cross sectional shapes thereof are the bottom plate 311 and the side plates 312 and 31.
3, 314, and 315 are uniform in the longitudinal direction of the bending line. Therefore, the joining member 309 can be manufactured by extrusion molding.

In the joining member 309 thus constructed, the profile 301 is fitted into the fitting part 310 such that the longitudinal direction of the profile 301 is parallel to the bending line of the fitting part 310. On the other hand, in the shape member 302, the longitudinal direction thereof is the fitting portion 316.
It is fitted into the fitting portion 316 so as to be perpendicular to the bottom plate 311. Further, the shape member 303 is inserted into the hole 301b of the shape member 301 with its longitudinal direction perpendicular to the longitudinal direction of the shape member 301, and the tip of the shape member 303 is inserted into the central plate 301a of the shape member 301.
Abut.

After positioning the shape members 301 and 302 using the joining member 309 in this manner, the side plates 312 and 313 of the joining member 309 and the side plate of the shape member 301 are
The side plates 312 and 313 are welded and joined along the edges thereof.
In addition, the side plates 314 and 315 of the joining member 309 and the profile 3
No. 02 side plate is welded along the lower end edges of the side plates 314 and 315. Further, the side plate of the shape member 303 and the upper plate of the shape member 1 are welded and joined.

As a result, the shape member 301 and the shape member 302 are connected via the joining member 309, and the shape member 303 is connected to the shape member 301. In the present embodiment, as described above, since the joining member 309 can be manufactured by extrusion molding, its manufacturing cost is low. Also, the joining member 30
Since the profile members 301 and 302 are set by using 9, the setting work is extremely easy. Furthermore, in the present embodiment, the side members of the joining member 309 and the shape members 301 and 302 are not directly welded and connected to the shape members 301 and 302.
Since it is welded and joined to the side plate, the heat-affected portion of the profile is dispersed, and strength deterioration due to softening is prevented. Furthermore, the side plates 312 to 315 of the joining member 309 are
Are welded to the side plates of the shape members 301 and 302, the reinforcing effect of the side plates can be obtained, and the strength of the joint can be increased as compared with the case of directly welding the shape members 301 and 302.

FIG. 20 shows a joining member 22 according to the sixth embodiment.
21 is a plan view thereof, FIG. 22 is a left side view thereof, and FIG. 23 is a right side view thereof. The joining member 320 of this embodiment has fitting portions 321 and 327 that share the bottom plate 322. This fitting part 321
Is the bottom plate 322, and the bottom plate 322 is provided at both ends of the bottom plate 322.
Is formed by side plates 323 and 324 extending vertically from. Further, the fitting portion 327 includes the bottom plate 322 and the bottom plate 3
It is constituted by side plates 325 and 326 extending vertically from 22. The side plates 323 and 325 are on the same plane, and the side plates 324 and 326 are on the same plane. Also, the side plate 3
22, 323 and the side plates 324, 326 are parallel to each other. Further, the widths of the fitting portions 321 and 327 are the same.

On the other hand, on the outer surface of the side plate 324, the side plate 33 is provided.
1, 332 extend perpendicularly to the side plate 324 and parallel to the side plate 322. With the side plate 324 as the bottom face, the side plate 3
The fitting portion 330 is configured by the 24 and the side plates 331 and 332.

As described above, the fitting parts 321 and 327 are arranged back to back, and the fitting part 330 is fitted to the fitting parts 321 and 32.
7, and the bottom surface and the side surface thereof are arranged so as to be orthogonal to each other. However, the bending lines of the fitting portions 321, 327, and 330 are all parallel. Therefore, the joining member of this embodiment can also be manufactured by extrusion molding.

Thus, in this embodiment, as shown in FIGS. 20 to 23, the shape member 301 is attached to the fitting portion 321 and the shape member 3 is formed.
The upper surface of 01 is brought into contact with the bottom surface of the fitting portion 321 to be fitted,
The shape member 302 is fitted to the fitting portion 327 by bringing the tip end of the shape member 302 into contact with the bottom surface of the fitting portion 327 to fit the shape member 304 to the fitting portion 330 and the tip end of the shape member 304 to the fitting portion 330. Make contact with the bottom surface of and fit.

Then, the side plates 323, 32 of the fitting portion 321
4 and the side plate of the shape member 301 are welded to each other at the edges of the side plates 323 and 324. In addition, the side plate 32 of the fitting portion 327
5, 326 and the side plates 331 and 332 of the fitting portion 330,
The shape members 302 and 304 are joined by welding at the leading edge of each side plate. As a result, the shape members 302 and 304 are bonded to the shape member 301 so that the shape members 302 and 304 are orthogonal to each other. Also in this embodiment, since the side plate of the shape member and the edge of the side plate of the fitting portion are welded, the welding heat affected zone is dispersed and softening by the welding heat affected zone is prevented.

In this embodiment, by appropriately setting the distance between the side plates of the fitting portion in accordance with the lateral dimension or the vertical dimension of the shape members, it is possible to arbitrarily connect the shape members of various sizes. it can.

Even when the two shape members are in a twisted relationship, if the side plate of one fitting portion and the side plate of the other fitting portion are formed not at parallel but at a predetermined angle. Good. However, also in the case of this joining member, when it is manufactured by extrusion molding, it is necessary that the bending lines of the side plate and the bottom plate of each fitting portion are parallel to each other.

FIG. 24 is a front view showing a joining member according to the seventh embodiment, FIG. 25 is its plan view, FIG. 26 is its rear view, and FIG. 27 is a left side view. Joining member 3 of this embodiment
As shown in FIG. 25, a fitting portion 341 and a fitting portion 342, which are U-shaped in a plan view, are connected by a pair of vertical plate-shaped beams 343a and 343b. Beam 34
3a is shorter than the beam 343b and therefore the fitting 34
1 and the fitting portion 342 are not parallel in the depth direction,
There is a slight difference. Further, as shown in FIG. 24, the fitting portions 341 and 342 and the beams 343a and 343b are inclined so as to rise from the fitting portion 341 toward the fitting portion 342, and the fitting portion 342 is fitted. It is located higher than the junction 341. Further, the cross beam 344 is the beam 343a.
One end of the beam 343b and the other end of the beam 343b are connected in a diagonal direction. This cross beam 344
Thereby, the strength of the beams 343a and 343b is improved, and the bonding strength of the shape members can be increased.

In the joining member 340 thus configured, the joining member 340 is fitted by contacting the side surface of the shaping member 347 with the bottom surface of the fitting portion 342 with the shaping member 347 extending slightly curved in the vertical direction. The fitting portion 342 is fitted from the side. Further, the shape member 346 extending in the horizontal direction is fitted to the fitting portion 341 with its tip end surface abutting the bottom surface of the fitting portion 341. Then, the side plates of the fitting portions 341 and 342 and the shape members 346 and 3
The side plate 47 is fixed by welding. Further, the horizontally extending shape member 348 is arranged such that the upper surface thereof is in contact with the lower surface of the tip end portion of the shape member 346 and one side surface of the shape member 348 is in contact with the bottom surface of the fitting portion 341, and the shape members 348 and 346 are arranged. And fitting part 3
The bottom plate 41 is welded and joined.

As a result, the shape members 346, 347, 348 are formed.
Can be fixed to each other. Also in this embodiment,
The bending lines of the bottom plate and the side plates of the fitting portion are parallel to each other.
Therefore, this joining member 340 can also be manufactured by extrusion molding.

In this embodiment, the shape members 347 and 3 are used.
46 is almost vertical and in a twisted relationship, like this,
By adjusting the direction of the fitting portion variously under the condition that the bending lines are parallel, the shape members can be joined in any manner.

The joining member of each of the above embodiments is shown in FIG.
As shown in 8, 20, 25, the cross-sectional shape is uniform,
For this reason, since it can be manufactured by extrusion and cutting, the increase in manufacturing cost of the welded structure by using this joining member is extremely small.

According to this embodiment, it is possible to join the shape members at a predetermined design connection angle, to join the shape members having a twist relationship, and to easily perform the setting work. Further, in the present embodiment, since the side plate of the fitting portion and the side plate of the shape member are welded and joined, it is possible to prevent the welding heat-affected zone from being concentrated, as compared with the case of directly welding the shape members. The joint plate is reinforced by the side plate of the fitting portion, and the reliability of the joint portion is improved.

Next, the bracket 1 used in the front frame 10 of the frame structure according to the embodiment of the present invention.
5 will be described in more detail. FIG. 28 shows the bracket 1
5 is a front view showing FIG. 5, FIG. 29 is a plan view thereof, and FIG. 30 is a left side view thereof. The bracket 150 is the first front cross member 11 of the front frame 10 of the space frame structure 1.
A second front cross member 13 arranged in parallel to the front of the first front cross member 11;
And a second front coupling member 16a extending obliquely downward from the front cross member 13 of FIG.

The bracket 15 has a first fitting portion 410 and a second fitting portion 411 having a U-shaped cross section, and a beam 412 between the first and second fitting portions. Fitting part 4 of bracket 15
Reference numerals 10 and 411 each have a bottom plate and side plates provided upright at both ends of the bottom plate, and the bottom plate and the side plates form a U-shaped cross section. Then, the beam 412 is attached to the fitting portions 410 and 411.
The bottom plate has a plate shape so that both ends of the bottom plate are connected to each other. In addition, the bending lines of the side plates and the bottom plate of the fitting portions 410 and 411 are parallel to each other, and the sectional shape of the bracket is uniform in the longitudinal direction of the bending lines. Then, as shown in FIG. 29, a spot softening portion 413 is formed at the center of the beam 412 by spot TIG welding.

A third fitting portion 415 is provided below the second fitting portion 411. This third fitting portion 41
In 5, the depth direction of the fitting portion is inclined forward and downward of the vehicle body. In the bracket 15 configured as described above, the first fitting portion 410 is fitted to the horizontally extending first front cross member 11 from the side thereof, and the horizontally extending first fitting portion 411 also extends horizontally. 2 Insert the front cross member 13 laterally. Then, the front connecting member 16 extending forward and downward
The upper end of a is fitted into the third fitting portion 415 from below.

Then, the side plate of the fitting portion having a U-shaped cross section and the side plates of the members 11, 13 and 16a are joined by the blind rivet 414. The blind rivet is a rivet that can be installed on one side. As a result, the second front cross member 1 is provided in front of the first front cross member 11.
A structure in which the third and second front coupling members 16a are connected via the bracket 15 is obtained.

Also in this embodiment, it is possible to obtain a front frame structure for a vehicle body which has a high absorption of impact energy, is easy to replace, and is free from the possibility of deterioration of characteristics due to thermal influence and stress corrosion cracking. As described above, in this embodiment, the front cross members 11 and 13 are joined by welding instead of welding.
Blind rivets 414 are used to mechanically join. Therefore, it is possible to prevent the strength characteristics of the front cross member from being deteriorated due to the influence of welding heat and adversely affecting the energy absorption at the time of collision. Also, the front cross member 11,
Since the 13 and the bracket 15 can be made of an aluminum alloy having no risk of stress corrosion cracking instead of JIS7000 series alloy, stress corrosion cracking does not occur even when exposed to high temperature due to engine heat or the like.

Further, when the automobile collides, since the point softening portion 413 is formed, the beam 412 is preferentially deformed and absorbs the impact as shown in FIG.
Therefore, transmission of impact force to the vehicle body can be reduced.

Further, when the second front cross member 13 is damaged due to an accident or the like, the bracket 15 is mechanically joined by the blind rivet 414, so that the bracket 15 can be easily removed and repaired. is there. In addition, since the bending lines of the bracket are all parallel, the bracket can be easily manufactured by an extrusion molding and cutting process, and the manufacturing cost is low.

The front frame 10 of the vehicle body of the above embodiment
Acts as a bumper. However, this is provided on the space frame of the vehicle body, and is different from the bumper attached to the outside of the vehicle body.

[0090]

As described above, according to the present invention,
At the time of a collision, the second front cross member and the third front cross member function as a bumper separately from a normal bumper provided outside the vehicle body, and absorb the collision energy by the deformation of the bracket. Even in a truck without a hood, collision energy directly acting on the cabin can be sufficiently absorbed, and collision safety is high.

Further, the present invention makes it possible for the first time to put into practical use a cabin for a freight vehicle having a space frame structure made of an aluminum material, which makes it possible to reduce the weight of a cabin of a freight vehicle such as a truck and the weight of the reduced weight. Only the cargo load can be increased, which will improve the transportation capacity. Further, by using the joining member and the reinforcing member, it is possible to enhance the productivity, ensure the overall rigidity, and reduce the manufacturing cost. Furthermore, the degree of freedom in design can be improved by using a lot of bending.

[Brief description of drawings]

FIG. 1 is a perspective view showing a frame structure of a truck cabin according to an embodiment of the present invention.

FIG. 2 is a diagram showing a first embodiment of a joining member.

FIG. 3 is a sectional view showing a second embodiment of a joining member.

FIG. 4 is a plan view of the same.

FIG. 5 is a front view showing a state in which the shapes are joined together.

FIG. 6 is a diagram for explaining the effect of this embodiment.

FIG. 7 is a diagram for explaining the effect of this embodiment.

FIG. 8 is a sectional view showing a third embodiment of a joining member.

FIG. 9 is a side view of the same.

FIG. 10 is a front view showing a state in which the shapes are joined together.

FIG. 11 is a cross-sectional view showing a fourth embodiment of a joining member.

FIG. 12 is a side view of the same.

FIG. 13 is a front view showing a state in which the shapes are joined together.

FIG. 14 is a perspective view showing a shape member.

FIG. 15 is a plan view of the same.

FIG. 16 is a front view showing the joining member of the fifth embodiment.

FIG. 17 is a plan view of the same.

FIG. 18 is a left side view of the same.

FIG. 19 is a sectional view taken along line AA of FIG.

FIG. 20 is a front view showing a sixth embodiment.

FIG. 21 is a plan view of the same.

FIG. 22 is a left side view of the same.

FIG. 23 is a right side view of the same.

FIG. 24 is a front view showing a seventh embodiment.

FIG. 25 is a plan view of the same.

FIG. 26 is a rear view of the same.

FIG. 27 is a left side view of the same.

28 is a front view showing the structure of the front frame 10. FIG.

FIG. 29 is a plan view of the same.

FIG. 30 is a left side view of the same.

FIG. 31 is a view for explaining the action of the bracket at the time of collision.

FIG. 32 is a diagram showing a space frame structure proposed as a track.

[Explanation of symbols]

101, 102: Shape members 103, 107, 113: Joining members 104, 108: Angle determining parts 105, 106, 109, 110: Locking part 111: Welding part 112: Softening part 201, 202: Shape member 208: Angle Determining parts 208a and 208b: Copying part 208c: Inner plate 208d: Outer plates 208e to 208i: Connecting plates 209, 210: Locking part 211: Joining member 212, 213: Connecting plate 225: Tip edge 226: Notch 301, 302, 303, 304, 346, 347, 3
48: Shape members 309, 320, 340: Joining members 310, 316, 321, 327, 330, 341, 3
42: Fitting parts 311, 322: Bottom plates 312, 313, 314, 315, 323, 324, 3
25, 326, 331, 332: Side plates 343a, 343b, 344: Beams 410, 411, 415: Fitting portion 412: Beam 413: Point softening portion 414: Rivet

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takato Fujii 14-1 Chofu Minatomachi, Shimonoseki City, Yamaguchi Prefecture Stock Company Kobe Steel Works Chofu Factory (72) Inventor Katsuhiko Inoue 141-1, Chofu Minatomachi, Shimonoseki City, Yamaguchi Prefecture No. Stock Company Kobe Steel Works Chofu Factory (56) Reference JP 5-58338 (JP, A) JP 5-319304 (JP, A) JP 8-169286 (JP, A) JP Flat 8-310453 (JP, A) Actually open 62-56489 (JP, U) Actually open 4-22375 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B62D 33 / 06 B23K 9/00 501 B62D 25/08

Claims (13)

(57) [Claims] 1. A frame structure for a freight vehicle cabin obtained by welding and joining a plurality of aluminum or aluminum alloy profiles, wherein a front frame at the front of the cabin and a pair of side frames at both sides of the cabin. A floor frame of the cabin floor, a rear frame of the cabin rear, and a ceiling frame that constitutes a cabin ceiling, the front frame being connected between the front end portions of the pair of side frames. A first front cross member, a pair of first front coupling members fixed to the front ends of the pair of side frames and extending in the cabin height direction, and a front portion of the first front cross member. A second front cross member that is disposed parallel to the first front cross member and that has both ends connected to the pair of first front connecting members, respectively, and a height from the second front cross member. Person A third front cross member which is spaced apart in the opposite direction and is arranged in parallel with the second front cross member and whose both ends are respectively connected to the pair of first front connecting members; A bracket that connects the first front cross member and the second front cross member, and a second front part that extends obliquely forward from the second front cross member to the third front cross member and connects the two. A frame structure for a lorry cabin having a coupling member. 2. The front frame has one or a plurality of fourth front cross members arranged in front of the first front cross member in parallel with a third front cross member. A frame structure for a lorry cabin according to claim 1. 3. The side frame has a frame-shaped portion formed along the contours of the door frame and wheels of the cabin, and a reinforcing member suspended in the frame-shaped portion in the height direction. The frame-shaped portion includes front and rear side members and a roof side member extending in the vehicle body front-rear direction, and upper and lower side members extending in the vehicle body height direction.
Or the frame structure of the lorry cabin described in 2. 4. The floor frame includes one or a plurality of floor cross members connecting between the pair of side frames, and between the rear frame and a third cross member of the front frame. 4. One or a plurality of floor side members connected to each other, and at least the floor side members are rectangular tubular members having a cross section of a day shape. The frame structure of the lorry cabin described in. 5. The rear frame has one or a plurality of rear cross members that connect between the rear ends of the pair of side frames, and the rear frame has one or more rear cross members. The frame structure of the lorry cabin described in. 6. The cargo vehicle cabin according to claim 1, wherein the ceiling frame has a ceiling cross member that connects upper end portions of the pair of side frame members. Frame structure. 7. The member according to claim 1, wherein the member is a rectangular tubular member, and the members are positioned and welded to each other by a joining member. Frame structure of the described lorry cabin. 8. Among the members, ones whose end faces are butted against each other and the butted parts are welded to each other,
The butt jointing member is positioned and welded to the butt joint, and the butt jointing member is formed by welding when the members are butted to each other at a predetermined angle.
A first angle-fixing part that interlocks the member between an angle-determining part that follows the outer surface or the inner surface of the side plates that intersect at an angle of less than or equal to 0 ° and a branching-out part that extends from this angle-determining part.
And a second locking portion.
The frame structure of the lorry cabin described in. 9. The frame structure for a freight vehicle cabin according to claim 8, further comprising a connecting portion that connects between ends of the first and second locking portions. 10. The members to be joined in an L-shape among the members are positioned and welded to each other by an L-shaped joining member, and the L-shaped joining member includes a bottom surface and both side surfaces thereof. Has a plurality of fitting portions which have a U-shaped cross section and fit the above-mentioned shape members, and at least two of the fitting portions
The frame structure for a lorry cabin according to claim 7, wherein the bottom surface and both side surfaces are parallel to each other. 11. The members to be joined in an L-shape among the members are positioned and welded to each other by an L-joining member, and the L-joining member is formed from a bottom surface and both side surfaces thereof. Has a plurality of fitting portions which have a U-shaped cross section and fit the above-mentioned shape members, and at least two of the fitting portions
One bottom surface is orthogonal to the other bottom surface, one side surface is orthogonal to the other side surface, one bottom surface is parallel to the other side surface, and one side surface is parallel to the other bottom surface. The frame structure for a lorry cabin according to claim 7, wherein: 12. The bracket includes a first fitting portion having a U-shaped cross section for fitting the first front cross member, and a second fitting having a U-shaped cross section for fitting the second front cross member. And a beam connecting the first and second fitting portions, wherein the first and second fitting portions are mechanically joined to the first and second front cross members by rivets, respectively. The frame structure for a lorry cabin according to claim 1, wherein 13. The frame structure for a freight vehicle cabin according to claim 12, wherein the beam has a softened portion formed by spot welding.