JPH10278845A - Collision safety device for cab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a collision safety device of a cab to prevent reduction of an occupant space by reducing upward rising deformation of an under rear frame to support the cab of a cabover type truck at the time of collision, etc. SOLUTION: A notch 4 is formed in the neighbourhood of a connecting portion of a rising part 2 of an under rear frame 1 to support a floor panel 16 of a cab 13 and a bed pan support part 3, and stopper brackets 5, 6 are welded by sandwiching the notch 4. At the time of collision, etc., the stopper brackets 5, 6 make pressure contact with each other on their contact surfaces, but an intersection angle of the rising part 2 of the under rear frame 1 and the bed pan support part 3 becomes an obtuser angle θ1 than an intersection angle θin the case when there is no collision, the under rear frame 1 is deformed downward, and upward rising quantity of the floor panel 16, etc., is reduced because of existence of the notch 4. Consequently, an occupant space M1 extensively becomes larger in comparison with a conventional occupant space M2 at the time of collision, etc. Consequently, it is possible to protect an occupant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cab collision safety device suitable for securing an occupant space in a cab in a cab of a cab-over type truck in which a cab largely absorbs impact energy.

[0002]

2. Description of the Related Art As shown in FIGS. 10 and 11, a cab 13 of a cab-over type truck is supported front and rear by a front mount bracket 14 and a rear mount bracket 15, and is rotatable about the front mount bracket 14. Supported. The rear mount bracket 15 supports the cab 13 at a position above the front mount bracket 14 in order to provide a layout for the engine and the like and a bed, and a floor panel 16 (FIG. 11) on the floor of the cab 13 is viewed from the front side. It is arranged in a state of standing up toward the rear side. The front mount bracket 14 and the rear mount bracket 15 are supported by a side frame 17 and a cross member 18 (FIG. 10).

The cab 13 has a floor panel 16 on the front mount bracket 14 side and the rear mount bracket 1 side.
It is supported by an underframe 19 installed between the underframe 19 and the fifth side. The under frame 19 is composed of an under front frame 20 and an under rear frame 1. The under rear frame 1 rises obliquely upward from the rear end side of the under front frame 20, and is substantially horizontal from the rising end of the rising portion 2 to the rear. And a bed pan support 3 extending to the outside. The seat 21 is supported on the floor panel 16 before the rising section 2, and the bed 22 is mounted on the bed pan support section 3.

As shown in FIG. 11, an occupant space of an appropriate size (indicated by M) is normally held between the seat 21 and the steering handle 23. However, in the event of an unexpected collision or the like, the cab 13 is deformed by receiving a pressing force from the front and rear. At this time, the under frame 19, especially the under rear frame 1 side is greatly deformed and lifted up as shown by a two-dot chain line in the figure, and the seat 21 is in a forward falling state, and the occupant space changes from M to M ₂ and becomes narrow. .

Conventionally, many countermeasures have been adopted as means for maintaining the occupant space. For example, the actual Kaihei 3
-72092, JP-A-5-185952,
JP-A-6-69079, Utility Model Registration No. 3002
918, and the like.

[0006] On the other hand, there are various types of collisions acting on the vehicle, and a normal impact force is absorbed by the frame supporting the cab and the cab. However, depending on the shock force more than expected, FIGS.
In some cases, the front mount bracket 14 supporting the cab 13 shown in FIG. 1 may be damaged, so that the impact energy cannot be absorbed on the side frame 17 side and the impact energy is absorbed only by the cab 13. Among the above known techniques, Japanese Utility Model Laid-Open No. 3-72092 and Japanese Patent Laid-Open No.
Japanese Patent Publication No. 185952 has a characteristic, but has a form in which impact energy is absorbed on the frame side. On the other hand, in Japanese Utility Model Laid-Open Publication No. 6-69079, the “cab cab-type vehicle cab having durability against collision impact” is composed of a front compartment (5b) and a rear compartment (5c). The rear chamber (5c) is formed to be thinner than the front chamber (5b), and a step (3a) is formed in the lower rain hose (3) of the rear chamber (5c) so that the rear chamber (5c) is thinner at the time of collision. The shock energy is absorbed by the deformation of the rear room (5c) and the step (3a), and the change in the occupant space in the front room (5b) is reduced as much as possible to protect the occupant. Further, the “cab floor type truck cab floor structure” disclosed in Utility Model Registration No. 30021818 has an upper convex portion (11) formed on the upper surface of a bed pan (4a), and an upper convex portion (11). A lower convex portion (1c) penetrating through the bottom wall (1b) of the opposing underframe (1) along the vehicle width direction.
Is formed. The upper convex part (11) and the lower convex part (1
By forming c), this portion is greatly deformed in the event of a collision, and the deformation of the portion supporting the seat is reduced to maintain the occupant space.

[0007]

Problems to be Solved by the Invention
Is effective in reducing occupant space,
As described above, the driver's seat (5) is applied to a cab of a special form composed of a front room (5b) and a rear room (5c), and the front room (5b) is made thick. In this case, the reinforcement structure becomes expensive. In addition, the step (3a) requires deep drawing, which increases the cost and the structure is complicated. On the other hand, the "floor structure" disclosed in Japanese Utility Model Registration No. 30021818 is effective in securing the occupant space as described above. However, as shown in FIG. And bed pan support 3
Because the intersection of is not bent, the lift of the seat floor remains.

The present invention has been made in view of the above circumstances, and reduces the amount of lifting of a seat or the like and reduces the occupant space in a collision mode in which the absorption of impact energy is largely borne by a cab. It is an object of the present invention to provide a cab collision safety device which has a simple structure and can be implemented at low cost. The effect of the present invention can be doubled by using the “floor structure” of Japanese Utility Model Registration No. 30021818 in combination.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above objects, the present invention secures an occupant space by preventing a floor portion supporting a seat in a cab of a cab-over type truck from lifting when a collision occurs. A cab collision safety device for forming a notch in the vicinity of the connecting portion between the rising portion of the under rear frame and the bed pan support portion, and disposing stopper brackets before and after the notch, The stopper bracket is fixed to the rising portion side and the bed pan support portion side, and forms a contact surface on the notch side. The contact surfaces oppose each other via an appropriate gap in a free state before the collision. It constitutes a collision safety device for a cab that is arranged as a cab. Further, the notch is provided on a lower surface or upper and lower surfaces of the under rear frame.

A notch is provided in the vicinity of the connecting portion between the rising portion of the under rear frame supporting the rear portion of the cab and the bed pan supporting portion, and the stopper bracket is disposed with the notch interposed therebetween. The abutment surfaces abut against each other to prevent deformation of the portion in the abutment direction, and the portion where the notch is formed becomes a weak portion, and the under rear frame bends in the opposite direction to the mounting portion of the stopper bracket. For this reason, the intersection angle between the rising portion and the bed pan support portion is an obtuse angle compared to the free state before the collision. As a result, the upward lifting of the seat is reduced, and the change in the occupant space is reduced.
In addition, the structure is extremely simple because it includes the notch and the stopper bracket.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a cab collision safety device according to the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the under rear frame 1 includes a rising portion 2 from the floor supporting the seat 21 and a bed pan supporting portion 3 supporting the bed 22, and a connecting portion between the rising portion 2 and the bed pan supporting portion 3. Intersect at an angle θ.
In addition, as shown in FIG.
U that forms an opening at the top and overhangs the flange on both sides
It has a U-shaped cross section.

As shown in FIGS. 1 to 3, on the lower surface near the intersection of the rising portion 2 and the bed pan supporting portion 3, a part of both corners on the bottom is pushed inward. A notch 4 having a relatively sharp shape is formed. On the other hand, stopper brackets 5 and 6 are fixed to the lower surfaces of the rising portion 2 and the bed pan support portion 3 with the notch 4 interposed therebetween.

FIG. 5 shows an embodiment of the stopper bracket 6 (the stopper bracket 5 also has substantially the same structure). The stopper bracket 6 has an abutment surface 9 (an abutment surface 8 (FIG. 1) in the case of the stopper bracket 5) having an appropriate area on one end surface side, and the abutment surface decreases toward the other end surface side. And has a relatively rigid structure having a U-shaped cross section. FIG. 4 shows a welding mode of the stopper bracket 6 having the above-described structure and the bed pan support portion 3. That is, the stopper bracket 6 sandwiches the bottom side surface of the bed pan support 3 with the flange 7 and is welded to the lower side of the bed pan support 3. The contact surface 9 of the stopper bracket 6 is disposed near the notch 4 as shown in FIG. Similarly, the stopper bracket 5 is welded to the lower side of the rising portion 2 and its contact surface 8
Is arranged near the notch 4. Stopper bracket 5,
Reference numeral 6 denotes a state in which the contact surfaces 8 and 9 are opposed to each other with a gap 24 therebetween in a state where the contact surfaces 6 are welded to each other. This gap 24
The dimensions are so small that they do not touch.

FIG. 8 shows a schematic structure around the cab 13 provided with the under-rear frame 1 having the notch 4 and the stopper brackets 5 and 6 described above. The floor panel 16 of the cab 13 is supported by the under front frame 20 and the under rear frame 1 as described above, and is rotatably supported by the front mount bracket 14 and the rear mount bracket 15 on the side frame 17 as shown in the figure. . In the cab 13, a seat 21, a bed 22, a steering handle 23 and the like are arranged. The seat 21 is supported by the floor in front of the rising portion 2 of the under rear frame 1, and the bed 22 is supported on the bed pan support 3. In a normal free state without collision or the like, an appropriate occupant space M (FIG. 11) is formed between the seat 21 and the steering handle 23.

In the prior art, the cab 1
When an impact force acts on the cab 3, the cab 13 receives a pressing force from the front surface and the rear surface, and is deformed as shown by a two-dot chain line in FIG. For this reason, the under rear frame 1 changes from the state shown by the dotted line to the state shown by the two-dot chain line in FIG. That is, the intersection of the rising portion 2 of the under rear frame 1 and the bed pan support 3 is lifted, and the crossing angle θ ₂ is sharper than the crossing angle θ in the free state, and is greatly lifted. Therefore, the sheet 21 is greatly than by falling forward significantly while lifting as shown in two-dot chain line in the figure, the passenger space M ₂ is a free state occupant space M between the seat 21 and the steering wheel 23 (FIG. 11) To be reduced.

In Japanese Utility Model Registration No. 300218, as shown in FIG. 12 (a), the bed pan support portion 3 of the under rear frame 1 is bent from the notch N, and the seat is wider than that of the prior art without the notch N. Lifting of the support floor can be reduced. However, conversely, as shown in the figure, since the intersection between the rising portion 2 of the under rear frame 1 and the bed pan supporting portion 3 does not bend, the lifting of the seat supporting portion floor remains.

In addition to the utility model registration No. 3002918, the under rear frame 1 provided with the notch 4 and the stopper brackets 5 and 6 of the present invention is deformed as follows at the time of collision. First, at the time of collision, a pressing force acts on the under rear frame 1, so that the contact surfaces 8, 9 of the stopper brackets 5, 6 are pressed against each other. That is, the contact surfaces 8 and 9 are pressed against each other, and these portions are stretched to increase rigidity, thereby restricting bending in the acute angle direction. However, the notch 4 is originally formed in this portion, and the bending rigidity in the obtuse angle direction is low. Therefore, as shown in FIG. 9, the under rear frame 1 is deformed from the position of the dotted line to the state of the solid line by the action of the collision force from the front and back, and the intersection angle between the rising portion 2 and the bed pan support portion 3 is θ in the free state. Changes from θ to an obtuse angle θ ₁ . Therefore, FIG.
As shown in FIG. 12B, the bed pan support 3 of the under rear frame 1 bends and exhibits the same behavior as that of the utility model registration No. 3002918 in FIG. The portion in front of the intersection does not have a large behavior, and the lift above the floor of the seat support portion is greatly reduced, so that a safe occupant space can be secured. In this description, the case where Utility Model Registration No. 30021818 is used in combination with the present invention as a preferred embodiment has been described, but it goes without saying that only the present invention may be applied.

The solid line in FIG. 8 schematically shows the deformed state of the rising portion 2 and the bed pan support portion 3 of the under rear frame 1 at the time of a collision when only the present invention is applied. As described above, the crossing angle changes from θ to θ ₁
, The upward lifting of the seat support floor is greatly reduced compared to the prior art, and the seat 21 also moves only to the position indicated by the solid line. Therefore, sheet 21
The passenger space M ₁ between the steering wheel 23 and the steering wheel 23 is M
> M ₁ > M ₂ , and a safe occupant space can be secured.

FIGS. 2 and 3 show another embodiment of the present invention. In this case, a notch 4a is provided as a notch in addition to the notch 4 described above. Notch 4
“a” is formed on the upper surface side of the underbody frame 1 at the portion where the notch 4 is formed. That is, notch 4
“a” is formed by dropping or cutting a part of the flange portion and the upper side surface on the upper surface side. By providing the notch 4a, the crossing angle θ ₁ of the underbody frame 1 at the time of a collision further changes in an obtuse angle direction. As a result, the amount of lifting of the underbody frame 1 and the seat 21 upward is reduced, and the occupant space is reduced. Further holding can be achieved.

FIGS. 6 and 7 show another embodiment of the stopper bracket. Stopper bracket 5 in this example
As shown in FIG. 6, a and 6a are composed of a flat plate 10 and a box body 11 having a U-shaped cross section for welding the flat plate 10 to the upper surface, and a contact surface 12 is formed on one end surface of the box body 11. FIG. 7 shows a state in which the stopper bracket 5a (or 6a) having the above structure is welded to the rising portion 2 (or the bed pan supporting portion 3). Although the stopper brackets 5a and 6a of this embodiment are made of a material having higher rigidity than the stopper brackets 5 and 6, the function of the under rear frame 1 against deformation at the time of collision is substantially the same as that described above.

[0021]

【The invention's effect】

1) According to the cab collision safety device of the first aspect of the present invention, the upward deformation of the under rear frame and the floor panel supported by the under rear frame at the time of collision is restrained by a large width, thereby increasing the occupant space. Is secured and the occupants can be protected. Further, the present invention includes a notch and a stopper bracket, has a small number of parts, has a simple structure, and can be implemented at low cost. 2) According to the cab collision safety device of the second aspect of the present invention, the notch is formed on the upper and lower surfaces of the under rear frame, so that the lift amount of the under rear frame can be further reduced, and the safety of the occupant is further improved. Secured.

[Brief description of the drawings]

FIG. 1 is a side view showing an under rear frame of the present invention.

FIG. 2 is a partial side view showing a notch formed in the under rear frame of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a front view showing a welded state between the stopper bracket and the under rear frame according to the present invention.

FIG. 5 is a perspective view showing the structure of a stopper bracket according to the present invention.

FIG. 6 is a perspective view showing another embodiment of the stopper bracket of the present invention.

FIG. 7 is a front view showing a welding structure of the stopper bracket and the under rear frame of FIG. 6;

FIG. 8 is a side view showing a schematic structure around a cab having an under rear frame of the present invention.

FIG. 9 is a schematic view showing a deformed state of the under rear frame of the present invention at the time of collision.

FIG. 10 is a perspective view showing an outline of a cab support structure.

FIG. 11 is a schematic view showing a deformed state at the time of a collision in a cab supported by a conventional under rear frame.

FIG. 12 is a schematic diagram comparing a deformed state of an under rear frame of the present invention and one of the prior arts.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 under rear frame 2 rising section 3 bed pan support section 4 notch 4a notch 5 stopper bracket 5a stopper bracket 6 stopper bracket 6a stopper bracket 7 flange 8 contact surface 9 contact surface 10 flat plate 11 box body 12 contact surface 13 cab 14 front Mounting bracket 15 Rear mounting bracket 16 Floor panel 17 Side frame 18 Cross member 19 Under frame 20 Under front frame 21 Seat 22 Bed 23 Steering handle 24 Gap N notch

Claims (2)

[Claims] 1. A cab collision safety device for preventing a lift of a floor portion supporting a seat in a cab of a cab-over type truck vehicle at the time of a collision to secure an occupant space. A notch is formed in the vicinity of a connection portion between the bed pan support portion and the bed pan support portion, and a stopper bracket is disposed before and after the notch, and the stopper bracket is provided on the rising portion side and the bed pan support portion side. A collision safety device for a cab, wherein the cab is secured and forms a contact surface on the notch side, and the contact surfaces are arranged to face each other with an appropriate gap therebetween in a free state before the collision. 2. The cab collision safety device according to claim 1, wherein the notch is provided on a lower surface or upper and lower surfaces of the under rear frame.