JP2940361B2 - Car body front structure of cab-over type truck - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body front structure of a cab-over type truck (including a tractor).

[0002]

2. Description of the Related Art Conventionally, in the case where a cab-over type truck collides head-on with another similar truck or the like, the cab passengers in the cab are made safer, and in order to prevent or at least reduce the damage of the cargo, a lower portion of the front end of the cab is used. A shock absorber is attached to a front bumper provided in Japanese Patent Application Laid-Open No. 3-80672. The above-mentioned proposed device is extremely effective when most of the impact load at the time of a collision acts on a front bumper equipped with a shock absorbing material such as a head-on collision with the same type of truck, but it is used on highways that frequently occur recently. In the case of a ball impact collision, the location of the bed of a similar truck that was collided is slightly higher than the front bumper, so the shock absorber of the front bumper does not work effectively, and the body of the rear-end vehicle is essentially There is a problem that the cab is crushed greatly by colliding with the cab which is a weak thin plate structure.

[0003]

SUMMARY OF THE INVENTION The present invention relates to a conventional cab-over type truck in which the cab is effectively prevented from being crushed when it collides with a bed of a cab-over type truck or an obstacle slightly higher than a front bumper. It is an object of the present invention to provide a cab-over type vehicle body front structure capable of further reducing the number of passengers, thereby improving the safety of occupants in the cab.

[0004]

SUMMARY OF THE INVENTION The present invention has been devised to achieve the above object, and has an engine disposed below a cab, a radiator disposed in front of the engine, and a radiator disposed in front of the radiator. longitudinal direction of the vehicle body is disposed to a plate-like collision input member at its front end attached to and trailing edge and a plurality of pipe members secured to a bracket on the chassis frame extends, the collision input member The above chassis
At the front end of the frame and above the top of the chassis frame
Installed above and behind the cab tilt axis
And the vehicle body front structure (hereinafter first invention of), and arranged in front of the cab arranged engine and the engine downwards radiator cab-over truck, characterized in that to arrange towards, the A reinforcing frame member attached to the outside of the radiator, a plurality of front pipe members having a rear end fixed to the reinforcing frame member, extending in the vehicle longitudinal direction, and having a plate-shaped collision input member attached to the front end thereof; It is interposed between the reinforcing frame member of the radiator and the front end surface of the crankcase of the engine so as to extend in the front-rear direction of the vehicle body, and one end in the front-rear direction is fixed to the reinforcing frame member or the front end surface of the crankcase and the other end is fixed. A first rear pipe member opposed to the reinforcing frame member or the other of the front end surface of the crankcase with a small gap, a reinforcing frame member of the radiator, and a chassis frame behind the radiator; And one end in the front-rear direction is fixed to the reinforcing frame member or the chassis frame, and the other end is small relative to the other of the reinforcing frame member or the chassis frame. A second rear pipe member opposed with a gap therebetween, and the collision input member
At the front end of the chassis frame and the chassis frame
Install it above the upper surface and tilt the cab.
A cab-over type vehicle body front structure (hereinafter, referred to as a second invention) is arranged behind a shaft .

[0005]

According to the first aspect of the present invention, a radiator is disposed below the cab, is disposed in front of the engine, extends in front of the radiator, is disposed in the vehicle longitudinal direction, and has a plate-like collision with its front end. Since a plurality of pipe members are provided with the input member attached and the rear end of which is fixed to the bracket on the chassis frame, if a collision occurs with an obstacle, such as a cargo bed of the same type of truck, located slightly higher than the front bumper, Since the force is transmitted from the plate-like collision input member to the chassis frame via the plurality of pipe members and the brackets supporting the rear ends of the pipe members, the crush of the cab is effectively suppressed. Further, even if the pipe member buckles due to a large collision force, the buckling absorbs the collision energy, so that the crush of the cab is suppressed and the injury due to the secondary collision of the occupant in the cab is effectively reduced. . According to the second invention, a plurality of reinforcing frame members are mounted outside a radiator disposed in front of an engine disposed below the cab, and a plate-shaped collision input member is mounted in front of the radiator. A front pipe member is provided, and a first pipe member is provided between a reinforcing frame member of the radiator and a front end face of a crankcase of the engine.
And a second rear pipe member is disposed between the reinforcement frame member of the radiator and the chassis frame behind the rear pipe member. Therefore, when the vehicle collides with an obstacle at a position slightly higher than the front bumper, such as the bed of a truck of the same kind, the front pipe member acts first to suppress the crush of the cab. If the collision force is large, the pipe with the lower buckling strength of the front pipe member and the first and second rear pipe members will buckle, but since the buckling absorbs the collision energy, The crush of the cab is suppressed, and the injury due to the secondary collision of the occupant in the cab is effectively reduced.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the accompanying drawings. First, in the embodiment of the first invention shown in FIGS. 1 and 2, reference numeral 10 generally indicates a cab-over type truck, which is a pair of left and right side rails 12 extending in the front-rear direction of the vehicle body and a vehicle. A ladder-type chassis frame 16 comprising a plurality of cross members 14 arranged in the width direction and fixed to the side rails at both ends thereof by fasteners such as rivets and bolts is provided.

A tilt bracket 18 is fixed to a front end of the chassis frame 16, and a tilt shaft 20 is supported by the tilt bracket. A front end of a connecting arm 22 is pivotally attached to the tilt shaft 20. At the rear end of the connecting arm 22, a cab bracket 30 fixed to the lower side of the front end of a main sill 28 fixed to the floor 26 of the cab 24 is pivotally mounted.

An engine 32 is disposed below the floor 26 of the cab 24, and is mounted on the chassis frame 16 by front and rear mounting devices 34 and 36. A radiator 40 is disposed adjacent to and in front of the cooling fan 38 provided at the front end of the engine 32.

As best shown in the enlarged front view of FIG. 2 as viewed from the direction of arrow II in FIG.
Is a core 4 having an upper water chamber 42, a lower water chamber 44, and a number of heat exchange water tubes and fins disposed between the upper and lower water chambers.
The outer periphery, at least the left and right side edges, and the lower side edge are surrounded by a reinforcing frame member that is sufficiently rigid as compared with the radiator component, that is, the left and right vertical frames 48 and the lower frame 50. A mounting bracket 52 is protrudingly provided outside a lower portion of the left and right vertical frames 48, and the mounting bracket 5
2 is mounted on the chassis frame 16 via a mount rubber pad (not shown).

[0010] Rigid brackets 54 are fixed on the left and right side rails 12 of the chassis frame 16 on the sides of the radiator 40, respectively, and a plurality of upper and lower upper rails (in the case shown in the figure) are respectively extended on the front side surfaces of the brackets 54 to extend forward of the vehicle body. Up and down 2
The rear end of the pipe member 56 is fixed. At the front end of the pipe member 56, a collision input member 58 made of a plate having a substantially rectangular front surface is fixed. Above collision input
The member 58 is provided at the rear of the tilt shaft 20 at the chassis frame.
It is located above the upper surface of the arm 16. Also,
In the illustrated case, the pipe member 56 is formed from a pipe having a circular cross section. However, it is a matter of course that a square pipe such as a square or a hexagon can be adopted, and the collision input member 58 is illustrated in FIG. Although it has a rectangular shape, if it interferes with other surrounding parts or members, it is of course changed appropriately so as to partially bend and have irregular front and side shapes.

When the cab-over type truck 10 having the above configuration collides with another cab-over type truck,
The bed A of the rear-end collision vehicle is located at a position slightly higher than the front bumper 60 mounted on the front end of the chassis frame 16 as shown by a chain line in FIG. Therefore, the cab 24, which is a flexible structure consisting essentially of a thin steel plate, and the tilt bracket 18 having a small cross-sectional shape are easily broken, and the front end portion of the cab 24 is crushed by the carrier A of the rear impacted vehicle. A collides with the plate-like collision input member 58.

The collision input member 58 is supported by the chassis frame 16 via a rigid bracket 54 by a plurality of pipe members 56 extending in the front-rear direction of the vehicle body. In many cases, the pipe member 56 is buckled and the cab 24 is crushed further rearward when the collision force is extremely large. However, since the buckling of the pipe member 56 effectively absorbs the collision energy, the cab 24
The additional collapse of the cab is correspondingly small with respect to the absorbed collision energy, and the absorption of the collision energy has the advantage that injuries due to secondary collisions of the occupants in the cab are prevented or reduced.

Next, an embodiment of the second invention will be described with reference to a schematic side view of FIG. 3 and a front view of a main part of FIG . As shown the figure, the front pipe 56 of a plurality (four in the illustrated embodiment) which is fixed the first invention substantially similar to the collision input member 58 to the front end, a mounting plate 62 to the rear end of each It is fixed to the vertical frame 48 of the radiator 40 through the radiator 40.

Further, a first rear pipe member 66 is disposed between the radiator 40 and the engine 32, between an upper portion of the radiator 40 and an upper portion of the front end surface 64 of the engine 32. In the illustrated embodiment, as shown in the front view of FIG. 4, two first rear pipe members 66 are arranged side by side in the vehicle width direction, that is, in the lateral direction, and are fixed to the rear ends by welding or the like. The engine is fixed to a front end face 64 of a crankcase of the engine via a mounting plate 68. At the front end of the rear pipe member 66, a contact plate 7 formed of a plate extending in the lateral direction or having an appropriate cross-sectional shape, for example, an L-shaped member is provided.
0 is fixed, and both ends of the contact plate 70 are
Is opposed to the reinforcing vertical frame 48 with a small gap in the front-rear direction. The first rear pipe member 66 has a front end fixed to the reinforcing vertical frame 48 of the radiator 40 and a rear end opposed to the front end face 64 of the crankcase of the engine with a small gap. Good.

A second rear pipe member 72 is disposed behind the radiator 40 between a vertically central portion of the radiator 40 or slightly below the radiator 40 and the chassis frame 16 near the engine front end surface 64. . In the illustrated embodiment, two second rear pipe members 72 are provided in the horizontal direction, and each pipe member is fixed at its front end to the reinforcing vertical frame 48 of the radiator via a mounting plate 74. The rear end of each pipe member 72 faces the front end surface of a rigid bracket 76 fixed to the side rail 12 of the chassis frame 16 with a small gap in the front-rear direction. The second rear pipe member 72 has a rear end fixed to the bracket 76, and a front end thereof and a radiator reinforcing vertical frame 48 or a receiving member similar to the mounting plate 74 fixed to the vertical frame. On the other hand, they may face each other with a small gap in the front-rear direction. Further, the first and second rear pipe members 6
The small gap in the front-rear direction is provided between the front end or rear end of the engine 6 and 72 and the opposing engine front end surface 64 or the bracket 76 by vibrating the engine 32 and the radiator 40 independently. In order to protect the radiator 40 which is structurally weak, it is desirable to make the gap as small as possible within a range where the radiator 40 can be protected.

When the cab-over type truck 10 according to the second aspect of the present invention collides with another cab-over type truck, the essentially flexible cab 24 and the tilt bracket 18 having a small cross-sectional shape are easily broken, and The front end portion of 24 is crushed by the bed A of the rear-end collision vehicle, and the bed A collides with a plate-shaped collision input member 58 located in front of the radiator 40.

The collision input acting on the collision input member 58 is transmitted to the vertical frame 48 of the radiator 40 via the front pipe member 56, and is further transmitted to the heavy engine via the first and second rear pipe members 66 and 72. Since the cab 24 is transmitted to the rigid bracket 76 between the front end face 64 of the crankcase 32 and the chassis frame 16, in many cases, the crush of the cab 24 is suppressed substantially near the collision input member 58. However, when the collision force is particularly large, the buckling strength of the front pipe member 56 and the rear pipe members 66 and 72 having a small buckling strength buckles, and the cab 24 is further crushed rearward. Since the buckling effectively absorbs the collision energy, the additional crushing of the cab 24 is reduced correspondingly to the absorbed collision energy, and the absorption of the collision energy prevents occupant injury in the cab, or There are benefits that are reduced. As a result, it is possible to reduce the crush of the cab 24 due to the bed A of the rear-end collision vehicle, to secure more space for the occupant, and to prevent or reduce the injury due to the secondary collision of the occupant in the collision. Therefore, the safety of the occupant can be significantly improved as compared with the conventional cab-over type truck. It is apparent that the same effect as described above can be obtained even when the vehicle collides with another obstacle other than the loading platform A, which is slightly higher than the front bumper 60.

Further, in the first invention, the pipe member 56 is provided to extend in front of the radiator 40, and in the second invention, the front pipe member 56 is provided to extend in front of the radiator 40; Radiator 40
The number of the rear pipe members 66 and 72 that extend rearward can be appropriately added as long as interference with other components and members can be avoided.

[0019]

As described above, the vehicle body front structure of the cab-over type truck according to the first invention comprises an engine disposed below the cab, a radiator disposed in front of the engine, and a radiator disposed in front of the radiator. longitudinal direction of the vehicle body is disposed to a plate-like collision input member at its front end attached to and trailing edge and a plurality of pipe members secured to a bracket on the chassis frame extends, the collision input member Above chassis
At the front end of the frame and above the top of the chassis frame
Installed above and behind the cab tilt axis
A cab-over type truck body structure according to a second aspect of the present invention comprises an engine disposed below the cab, a radiator disposed in front of the engine, and a radiator disposed in front of the engine. A reinforcing frame member attached to the outside of the vehicle, a plurality of front pipe members having a rear end secured to the reinforcing frame member, extending in the vehicle longitudinal direction, and having a plate-shaped collision input member attached to the front end thereof; Between the reinforcing frame member and the front end surface of the crankcase of the engine, and one end in the front and rear direction is fixed to the reinforcing frame member or the front end surface of the crankcase, and the other end is fixed to the front end surface of the crankcase. A first rear pipe member opposed to the other of the reinforcing frame member or the front end surface of the crankcase with a small gap, a reinforcing frame member of the radiator and a chassis frame behind the radiator; And one end in the front-rear direction is fixed to the reinforcing frame member or the chassis frame and the other end has a small gap with respect to the other of the reinforcing frame member or the chassis frame. The second facing
A rear pipe member, and the collision input member is
At the front end of the chassis frame and above the chassis frame
And above the cab tilt axis.
The structure is simple and inexpensive, so that the cab can be effectively prevented from crushing when it collides with the bed of another truck, and the safety of occupants in the cab Can be improved, which is industrially beneficial.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing one embodiment of the first invention.

FIG. 2 is a front view of a main part as viewed in the direction of arrow II in FIG. 1;

FIG. 3 is a schematic side view showing one embodiment of the second invention.

FIG. 4 is a front view of an essential part viewed in a direction of an arrow along a line IV-IV in FIG. 3;

[Explanation of symbols]

10: cab-over type truck, 16: chassis frame,
24 cab, 32 engine, 40 radiator, 5
4 and 76: brackets on the chassis frame; 56: pipe members extending forward of the radiator; 58: collision input members; 66 and 68: pipe members extending rearward of the radiator;

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B62D 25/08 B62D 25/20

Claims (2)

(57) [Claims] 1. An engine disposed below a cab, a radiator disposed in front of the engine, and a plate-shaped collision input member extending in front of the radiator and disposed in the front-rear direction of the vehicle body. And a plurality of pipe members each having a rear end fixed to a bracket on a chassis frame, wherein the collision input member is connected to a front end portion of the chassis frame.
And provided above the upper surface of the chassis frame.
With the rear of the cab tilt axis
Vehicle body front structure of the cab-over type truck, characterized in that the. 2. An engine disposed below the cab, a radiator disposed in front of the engine, a reinforcing frame member mounted outside the radiator, and a rear end fixed to the reinforcing frame member. A plurality of front pipe members extending in the front-rear direction and having a plate-shaped collision input member attached to a front end thereof;
A vehicle body front-rear direction is interposed between a reinforcing frame member of the radiator and a front end surface of a crankcase of an engine, and one end in the front-rear direction is fixed to the reinforcing frame member or the front end surface of the crankcase and the other end. A first rear pipe member opposed to the other of the reinforcing frame member or the front end face of the crankcase with a small gap therebetween, and a vehicle body front and rear between the reinforcing frame member of the radiator and a chassis frame behind the radiator. One end in the front-rear direction is fixed to the reinforcing frame member or the chassis frame, and the other end is opposed to the other of the reinforcing frame member or the chassis frame with a small gap. A second rear pipe member ,
Connect the air-impingement input member to the front end of the chassis frame and the vehicle
Install it above the base frame and
A cab-over type vehicle body front structure, wherein the cab-over type truck is arranged behind a tilt axis of the cab.