JPH10250621A - Under-frame structure of bedless cab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an under-frame structure of a bedless cab which cuts a bed part behind the cab and increases the capacity of the rear body of vehicle, whereby it is possible to reduce deformation of the underframe in the event of collision, etc., secure the occupant's space in the cabin, and produce an underframe of simple structure to be yielded easily through a press working process. SOLUTION: To an under-rear-frame 2 of an under-frame 4 supporting a floor panel 5, a separately provided reinforcement 1 is welded in the specified position in such a way as rising so that the under-rear-frame 2 is reinforced. In the event of collision, etc., deformation of this frame 2 is reduced owing to the reinforcement 1, and decrease of the occupant's space M is checked. Provision of separate reinforcement 1 allows easy producing of under-rear-frame 2 through a normal press working process.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cab-over type truck vehicle and, more particularly, to an underframe structure of a betless cab. The present invention relates to an underframe structure of a rescue cab.

[0002]

2. Description of the Related Art As shown in FIG. 6, a cab 7a of a cab-over type truck has a front room 1 corresponding to a driver's cab in which a seat 8, a steering wheel 10 and the like are stored.
9 and a rear room 21 in which a nap bed 20 and the like are arranged. A luggage carrier (not shown) is disposed behind the rear chamber 21.

At the time of a collision or the like, the cab 7a is pressed from the front and a pressing force due to the inertia of the carrier acts from the rear. Therefore, the cab 7a is deformed by being pressed from front and rear. At that time, it is necessary to secure an occupant space indicated by M in FIG. In the related art, since the rear chamber 21 is provided as described above, there is a space that can absorb the collision energy by that amount, and the structure is such that the occupant space can be easily held.

[0004] Japanese Unexamined Utility Model Publication No. 6-69079 discloses a "cab-over-type vehicle cab having durability against collision impacts" which includes a front chamber (5b) and a rear chamber (5c). In the room 5 (corresponding to the cab),
In addition to reinforcing the periphery of the portion b), the door beam (7) is installed between the front and rear of the front chamber (5b) to reinforce the entire front chamber (5b). There has been disclosed a technique for suppressing deformation and absorbing a collision energy by largely deforming only the rear chamber (5c) to secure an occupant space.

[0005] Japanese Unexamined Utility Model Publication No. 4-99179 discloses a "lower body structure of a vehicle" in which a reinforcing gusset is disposed at a relatively rigid portion of a space between a floor panel and a side frame of a cab. A technique for reinforcing a part is disclosed.

[0006]

The structure to be solved by the invention
The structure of the driver's cab disclosed in Japanese Patent No. 9079 discloses a rear cabin (5
This is an effective technique for the cab structure having c).
However, in the case of recent trucks, there are many types of trucks in which the capacity of a carrier is maximized to secure a load capacity, and a so-called betless cab of a type in which the cab itself is shortened accordingly. That is, in the betless cab, as shown in FIG. 6, the rear chamber 21 having the bet 20 is eliminated, and the rear end of the cab 7a is shortened to a position shown by a two-dot chain line. Therefore,
There is no space for absorbing this impact energy with respect to the pressing force from the carrier side, and it is difficult to maintain the M dimension of the occupant space.

In the case of the cab 7a having the rear chamber 21, an under frame 4a as shown in FIGS. 6 and 7 is arranged to support the floor panel 5a, the bed 22 on which the bed 20 is mounted, and the like. The under frame 4a is formed by welding the under front frame 3a and the under rear frame 2a as shown in FIGS. 6 and 7, and the under rear frame 2a is inclined as shown in FIG. A horizontal portion 12a extending horizontally from the rear, a bent portion 23 bent downward from the rear end of the horizontal portion 12a and having a step portion for fixing the rear mount rail 6, and the like.

In the case of the above-mentioned betless cab, the under front frame 3a has the same structure as the under front frame 3a, but the under rear frame 2a has a reduced horizontal portion 12a as shown in FIG.
b is adopted. In this case, the horizontal portion 12a of FIG.
When the shape is cut and the inclined portion 11a and the bent portion 23 are connected to each other, the dotted line shown in FIG. 8 is obtained. Therefore, an under rear frame 2b having a shape as shown in FIG. 8 is desirable. However, in the case of the under rear frame 2b, a deep drawing with a depth h is required, which is not preferable in terms of molding. Therefore, the present invention shown in FIG. 9 was adopted.
An under rear frame 2 using a reinforce 1 to be described later is employed. The reinforcer 1 is a frame reinforcing member like the reinforcing gusset disclosed in Japanese Utility Model Laid-Open No. 4-99179, but the reinforcer 1 of the present invention and the reinforcing gusset are reinforcing members. Except for the differences, the structure, purpose and effect are different.

The present invention has been made in view of the above circumstances, and has an underframe structure for securing the occupant space as much as possible in the event of a collision in a bedless cab. It is an object of the present invention to provide a betless cab under-frame structure that can be implemented in a vehicle.

[0010]

According to the present invention, there is provided an underframe structure for supporting a lower surface of a floor panel of a bedless cab and fixing a rear mount rail to a rear end thereof. The underframe structure has a U-shaped cross section and an upper opening side flange is welded to the floor panel. A flange formed at an upper rising end is welded to the floor panel, and a reinforce for welding the rear mount rail to a rear end forms an underframe structure of a bedless cab. More specifically, the reinforce is welded to the side surface of the underframe by overlapping an appropriate length of a lower portion thereof, and the flange of the reinforce is a portion where the reinforce is welded. , Which is formed so as to protrude outward from the flange of the under rear frame in a length longer than that of the under frame, and the protruding length has a dimension in which at least a welding tool for welding the flange to the floor panel can be inserted. Things.

The shape of the underframe itself is not required to be deep drawn, and the necessary rising portions are formed separately. In the present invention, a reinforcement is employed as the separate body so as to satisfy both functions of reinforcing the under rear frame and forming the entire shape. By providing the reinforcement, the rigidity of the under rear frame is improved, the deformation of the under rear frame due to an impact force at the time of a collision or the like is suppressed to be small, and the occupant space is secured. Also, it is not necessary to draw the underframe deep, and press molding is relatively easy. Further, the flange of the reinforcement is made longer than the flange of the under-rear frame so that the welding tool can be easily inserted, thereby facilitating the welding operation.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the underframe structure of a betless cab according to the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a schematic structure around a cab 7 having an underframe structure according to the present invention. The under frame 4 includes an under front frame 3 and an under rear frame 2. The reinforcement 1 is welded to the underlayer 2. A floor panel 5 is mounted on the upper surfaces of the under-front frame 3, under-rear frame 2 and reinforce 1, and is fixed thereto. A rear mount rail 6 is fixed to the rear end of the reinforcement 1.
A seat 8 is mounted on the floor panel 5, and a steering system 9 is supported on the under front frame 3 side. As shown, the steering handle 10
The distance between the vehicle and the seat 8 is an occupant space (indicated by M), and it is necessary to secure an appropriately sized occupant space at the time of a collision or the like.

[0013] As shown in FIG.
Is composed of an inclined portion 11 that rises inclining rearward and a horizontal portion 12 that extends horizontally rearward from the rising end, and has a U-shaped cross section having an opening upward as shown in FIG. Consisting of Flanges 13 are formed on both edges of the upper opening so as to project outward.

As shown in FIG. 2, the reinforcement 1 is welded to a corner portion 15 from the inclined portion 11 to the horizontal portion 12 of the under rear frame 2. In this embodiment, the reinforcer 1 is composed of a pair of plate pieces, and the lower end thereof is overlapped and welded to the side surface of the under rear frame 2 by an appropriate length.
The upper side rises upward from the position of the flange 13 of the under rear frame, and a flange 14 is formed at the rising end to project outward. The rising dimension b of the reinforce 1 is such that the rear mount rail 6 can be welded as shown in FIG. As shown in FIG. 1, the floor panel 5 abuts against the under-rear frame 2 and the flanges 13 and 14 of the reinforce 1, and is fixed by being welded thereto. In this example, the reinforce 1 is formed from a pair of plate pieces as described above, but as shown by a two-dot chain line in FIG.
It may be formed from a press-formed member having a U-shaped cross section connected by the above.

As described above, the reinforcement 1 is fixed to the underframe 2 so that the underframe 2 is reinforced and the rigidity is greatly improved. In addition, the rising height required for the under rear frame 2 side is formed by the reinforce 1, and it is not necessary to form the rising height h by deep drawing the under rear frame 2 itself. Therefore, the press forming of the under rear frame 2 itself is easily performed, and it is formed at low cost.

As shown in FIG. 5, the protruding end of the flange 13 of the under-rear frame 2 and the protruding end of the flange 14 of the reinforce 1 at the welded portion of the reinforce 1 are such that the flange 14 protrudes outward by a dimension a. Formed. As shown in FIG. 5, the dimension a is, for example, that the flange 1 of the reinforce 1 is attached to the floor panel 5.
This is for facilitating the insertion of the spot gun 16 which is a welding tool for spot welding the base 4, and the spot gun 16 is disposed at a distance from the end of the flange 13 of the under rear frame 2 by a gap δ at the time of spotting. The spot gun 16 does not interfere. As described above, by extending the flange 14 outward from the flange 13, the welding efficiency can be improved, the bending rigidity of the reinforce 1 is improved, and the rigidity of the portion of the under-rear frame 2 to which the reinforce 1 is welded is reduced. Can be further improved.

Next, a description will be given of how the cab 7 having the underframe structure according to the present invention maintains the occupant space at the time of collision. As described above, at the time of collision, the front side of the cab 7 is crushed, and the rear side is also pressed by the carrier and deformed. Therefore, the under front frame 3 and the under rear frame 2 are deformed by the impact force. In the present invention, the under front frame 3 side is the same as the prior art, so only the modification on the under rear frame 2 side will be described. As shown in FIG. 4, when assuming an under-rear frame 2a (represented by a dotted line) not reinforced by the reinforce 1, the under-rear frame 2a is largely bent forward by a pressing force from the rear and bent and deformed. In particular, the portion of the intersection 17 between the inclined portion 11a and the horizontal portion 12a is largely bent and largely bent forward as shown in the figure. Therefore, the dimensions M ₂ corresponding to the passenger space is significantly smaller than M shown in FIG. 1, securing predetermined passenger space is difficult.

On the other hand, in the case of the under rear frame 2 having the reinforce 1 of the present invention, the deformation of the portion reinforced by the reinforce 1 is extremely small as shown in FIG.
As a whole, the under rear frame 2 is slightly bent forward as shown by a two-dot chain line in the figure. Therefore, the dimension M ₁ corresponding to the passenger space is much larger than said M _2, it is possible to maintain a predetermined passenger space. As described above, even in the betless cab, it is possible to secure the same occupant space as in the conventional cab with a bet.

The reinforcer 1 according to the present invention has a very simple structure and can be implemented at low cost.
Further, by employing the reinforce having the bottom plate 18 as described above, it is possible to further enhance the reinforcing strength and reduce the deformation at the time of collision.

[0020]

【The invention's effect】

1) According to the underframe structure of the betless cab according to the first aspect of the present invention, the underrear frame is reinforced by relatively simple means for fixing the reinforce at a predetermined position of the underrear frame, so that it can be used in a collision or the like. Deformation due to the impact force is reduced. Thereby, even in the betless cab, the occupant space in the vehicle cabin can be secured. Also, since the required rising dimension is formed by the reinforce, the under-rear frame does not need to be deep drawn, and can be press-formed at low cost. 2) According to the underframe structure of the bedless cab according to the second aspect of the present invention, the reinforcement is superposed and welded to the underrear frame, so that the joining strength is improved and the reinforcement strength can be improved. 3) According to the underframe structure of the bedless cab according to claim 3 of the present invention, the flange of the reinforcement is formed so as to protrude longer than the flange of the underframe at the portion where the reinforcement is welded. At the time of welding to the floor panel, the welding tool does not interfere with the under rear frame side, so that the welding operation is performed reliably and efficiently.

[Brief description of the drawings]

FIG. 1 is a partial side view showing a schematic structure around a lower portion of a cab having an under rear frame of the present invention provided with a reinforcement.

FIG. 2 is a side view showing a detailed structure of the under rear frame of the present invention.

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

FIG. 4 is a side view comparing and displaying a deformed state of the underwear frame of the present invention at the time of collision or the like and a deformed state of the conventional underwear frame.

FIG. 5 is a partial cross-sectional view showing a welding state of the reinforcement and the floor panel in the present invention.

FIG. 6 is a side view showing a schematic structure of a general cab-over type cab.

FIG. 7 is a side view showing a schematic structure of the underframe in FIG. 6;

FIG. 8 is a side view showing the temporary shape of the underframe in the betless cab.

FIG. 9 is a schematic diagram of the underframe of the present invention in which the problem of the underframe shown in FIG. 8 is solved.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reinforce 2 Under rear frame 3 Under front frame 4 Under frame 5 Floor panel 6 Rear mount rail 7 Cab 8 Seat 9 Steering system 10 Steering handle 11 Inclined part 12 Horizontal part 13 Flange 14 Flange 15 Corner 15 Spot gun 17 Intersection 18 Bottom plate

Claims (3)

[Claims] 1. An underframe structure for supporting a lower surface of a floor panel of a bedless cab and fixing a rear mount rail to a rear end thereof, wherein the underframe structure has a U-shaped cross section and an upper opening. And an under rear frame for welding a side flange to the floor panel, and a flange formed at a predetermined height on a rear side surface of the under rear frame by a suitable height and welded, and a flange formed at an upper rising end is welded to the floor panel. And a reinforcement for welding the rear mount rail to a rear end thereof. 2. The underframe structure of a betless cab according to claim 1, wherein the reinforcement is welded to a side surface of the underrear frame by overlapping a lower portion of the reinforcement by an appropriate length. 3. The flange of the reinforce,
A portion where the reinforcement is welded is formed so as to protrude outward from the flange of the under rear frame longer than the flange, and the protruding length is such that at least a welding tool for welding the flange to the floor panel can be inserted. An underframe structure for a betless cab, characterized by its dimensions.