JP2002205662A - Frame structure of cab over type car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the work to absorb the collision energy of a side frame in the collision of a cab over type car and prevent the rear of a front mount bracket for supporting a cabin from deforming. SOLUTION: In the cab over type car wherein a front mount bracket 4 for supporting the cabin 1 on the external side face 21 of the side frame 2 at a rear position more than a front cross member 3 installed between the front sides of right and left side frames 2, the external end section 31 of the front cross member 3 and the tip section 42 of the front mount bracket 4 are connected to each other by a band member 5 made from a strap steel plate attached so that the small sides becomes vertical. When the front end section of an under carriage frame collides with an obstacle, the crash stroke of the front end sections of the side frames 2 is not prevented due to the flexion of the band member 5, and when the front face section of the cabin 1 collides with an obstacle, the extension of the band member 5 prevents the front mount bracket 4 from deforming in a rear direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame structure of a cab-over type vehicle, and more particularly to a front structure of a frame.

[0002]

2. Description of the Related Art In the case of a cab-over type vehicle in which a cabin serving as a passenger compartment is located at a front portion of a vehicle, an underframe is provided at a front end of a side frame with respect to a collision load in order to ensure occupant safety during a collision while the vehicle is running. It is necessary to absorb the collision energy efficiently by compressive deformation in the front-rear axis direction at the part.

As shown in FIG. 3, the front structure of this type of chassis frame generally has both outer end portions 31 of the front cross member 3 in the vehicle width direction aligned with the outer surface 21 of the side frame 2 and The front mount bracket 4 is inserted into the opening of the front cross member 3 having a U-shaped cross section that opens rearward at the front end of the frame 2 and fixed by welding to secure a crash stroke of the side frame 2 at the time of collision. In many cases, is fixed to the outer side surface 21 of the side frame 2 at a position retracted backward from the front cross member 3. The cabin 1 is mounted and fixed on the front mount bracket 4 via an anti-vibration member (not shown).

[0004]

By the way, according to the conventional structure, when the vehicle hits a relatively soft obstacle such as the rear portion of a passenger car, the front end portion of the side frame 2 which is supposed to receive the collision load. May not bite into the lower part of the obstacle without compressive deformation in the axial direction. In this case, an obstacle collides with the front surface of the cabin 1 and the front end of the front mount bracket 4 for mounting and fixing the cabin 1 projects greatly outside the vehicle. 4 may be deformed rearward, and the front portion of the cabin 1 may be deformed and moved rearward.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cab-over type vehicle frame structure that can reinforce the front mount bracket without hindering the side frame from absorbing the collision energy.

[0006]

According to the present invention, a front mount bracket is provided on an outer surface of a side frame at a position rearward of a front cross member provided between front ends of left and right side frames. In the cab-over type vehicle provided, the outer end of the front cross member connected to the front end of the side frame and the front end of the front mount bracket are connected by a band member made of a band-shaped steel plate with the plate width direction up and down.

[0007] The front end of the front mount bracket is connected to the outer end of the front cross member of the chassis frame with high rigidity by a band member that is strong against pulling and easily deformable against bending. The rearward deformation of the front mount bracket can be prevented without hindering the collision energy absorbing action of the portion.

[0008]

FIG. 1 is a perspective view showing a front structure of a frame according to the present invention (FIG. 1 shows only the left side thereof).
As shown in the figure, a front cross member 3 for bridging the left and right side frames 2 is connected to the front ends of the left and right side frames 2 of the chassis frame. The side frame 2 is formed of a long member having a U-shaped cross section that opens inward, and its front end is fitted into an opening of a front cross member 3 having a U-shaped cross section that opens rearward, and is fixed by welding. is there. The outer end portion 31 of the front cross member 3 in the vehicle width direction matches the outer surface 21 of the side frame 2 and does not protrude outward.

Reference numeral 4 denotes a front mount bracket which is welded to the outer side surface 21 of the side frame 2 at a position retracted rearward from the front cross member 3 and has a crash stroke at the front end of the side frame 2. Is secured. Front mount bracket 4
Is a U-shaped cross section with a downward opening, a vertical wall portion 41 at the base end is welded to the outer side surface 21 of the side frame 2, and the front mount bracket 4 projects outwardly at a substantially right angle to the side frame 2. I have.

[0010] Mount brackets (not shown) provided at the left and right ends of the lower portion of the cabin 1 are mounted on the front mount bracket 4 via the vibration isolating member, and the vibration isolating member and the front mount bracket 4 are separated from the cabin side mounting bracket. The cabin 1 is supported by the chassis frame by bolting the penetrating mounting bolt from below.

Reference numeral 5 denotes a band member, which is an outer end 31 of the front cross member 3 and an outer end 3 of the front cross member 3.
1 and is connected to the distal end portion 42 of the mount bracket 4 which projects outward from the vehicle. The band member 5 is made of a band-shaped steel plate, and the intermediate portion 51 is linear, and the front end 5 of the intermediate portion 51 is formed.
2 and the rear end portion 53 are bent in a substantially U-shape. The band member 5 uses the plate width direction as the vertical direction,
The front end 52 and the rear end 53 are respectively the outer end 31 of the front cross member 3 and the front mount bracket 4.
And is welded and fixed to the tip end portion 42. In addition, you may fix by bolting.

FIGS. 2A and 2B show a state after a collision in the front structure of the chassis frame of the present invention.
2A shows a case where the obstacle 7 is relatively soft like the rear part of a passenger car, and FIG. 2B shows a case where the obstacle 7 is hard.

At the time of the collision shown in FIG. 2A, the front end of the chassis frame, which is supposed to receive the collision load, bites into the obstacle 7, and the front end of the side frame 2 is not compressed and deformed in the axial direction. The front mount bracket 4 collides with the obstacle 7 together with the front part or the front part of the cabin 1,
The front mount bracket 4 is deformed rearward on the front end portion 42 side protruding in the vehicle outward direction due to the collision load, but is locked by the front cross member 3 of the highly rigid chassis frame by the pulling of the band member 5, and Backward deformation is prevented. As a result, rearward displacement of the unillustrated cabin front portion is suppressed.

On the other hand, at the time of the collision shown in FIG. 2B, if the front end of the chassis frame collides with the obstacle 7, the collision load F
Thus, the front end of the side frame 2 is compressed and deformed in the axial direction toward the rear of the vehicle, so that the collision energy is absorbed. In this case, the intermediate portion 51 of the band member 5 is bent and deformed in the plate thickness direction with the retreat of the front end portion 52. Therefore, it does not prevent the side frame 2 from absorbing the collision energy.

[0015]

According to the present invention, the outer end portion of the front cross member and the front end portion of the front mount bracket are connected to each other by a band member made of a band-shaped steel plate. The front mount bracket can be reinforced without hindering the absorbing function of the front.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a front structure of a chassis frame of the present invention.

2A and 2B show a state after a collision in a front structure of a chassis frame according to the present invention, wherein FIG. 2A is a plan view when an obstacle is relatively soft, and FIG. 2B is a case where the obstacle is hard; It is a top view in the case.

FIG. 3 is a perspective view showing a front structure of a conventional chassis frame.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cabin 2 Side frame 3 Front cross member 4 Front mount bracket 5 Band member

Claims (1)

[Claims] 1. A cab-over type vehicle provided with a front mount bracket projecting outward from an outer surface of a side frame at a position rearward of a front cross member bridged between front ends of left and right side frames. A cab-over type vehicle frame, wherein an outer end of a front cross member coupled to a front end of the frame and a front end of the front mount bracket are connected by a band member made of a band-shaped steel plate having a plate width direction in a vertical direction. Construction.