JPH0858633A - Connection structure between cab and chassis in cab tilt mechanism - Google Patents

Abstract

PURPOSE: To provide a structure which makes a cab less prone to be detached from a chassis frame. CONSTITUTION: In a cab tilt mechanism in which a chassis 1 and a cab floor frame 2 are connected by a shaft 5 through a bracket 6 and the cab floor frame 2 is pushed up by a torsion bar 7 so as to tilt a cab, a bracket 24 is arranged at the rear of a cab hinge bracket 3 mounting part of the chassis 1, and a shaft 25 mounted onto the bracket 24 is connected to the shaft 5 by a steel rod 26.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for connecting a cab and a chassis in a cab tilt mechanism for preventing the cab from coming off.

[0002]

2. Description of the Related Art A cab for carrying out a cab tilt is connected to a chassis via a cab hinge bracket, and examples of the combined structure of the cab and the chassis in such a cab tilt mechanism are shown in FIGS. 6, 7 and 8. Has been done.

6 and 7 show examples in which a cab tilt is performed by a torsion bar. In the figures, 1 is a chassis, 2 is a cab floor frame, and 3 is a chassis 1 near the front end side surface thereof. A cab hinge bracket 5 made of cast metal, which is fixed via a bolt 4 of the above, is a shaft attached to the upper end of the cab hinge bracket 3 so as to extend in the width direction of the chassis 1, and the shaft 5 of the cab floor frame 2 is attached to the shaft 5. The cab is tiltably supported via a bracket 6 attached to the lower end of the tip.

Further, 7 is two torsion bars mounted on the cab hinge bracket 3 so as to be positioned below the shaft 5 and in parallel with the shaft 5, and 8 is mounted on the torsion bar 7 at the base end and at the cab floor at the tip. It is a lever that supports the lower surface of the frame 2.

At the time of tilting the cab, if a cab lock release lever (not shown) provided between the rear surface of the cab and the bed is operated, the cab floor frame 2 is pushed up via the lever 8 by the torsional force of the torsion bar 7. Therefore, the cab is tilted forward around the shaft 5.

FIG. 8 shows an example in which a cab tilt is performed by a hydraulic cylinder. In the figure, 9 is a casting fixed near the front end side surface of the chassis 1 through four bolts 10 extending in the width direction of the chassis 1. Made cab hinge bracket, 11
Is a shaft attached to the upper end of the cab hinge bracket 9 so as to extend in the width direction of the chassis 1, and a cab 12 is supported on the shaft 11 in a tiltable manner.

Further, 13 is a lever attached to the shaft 11 and extending substantially horizontally toward the rear, 14 is a tilt hinge bracket attached to a substantially central portion of the lever 13 in the longitudinal direction via a shaft 15 parallel to the shaft 11, Reference numeral 16 is a bracket attached to the side surface of the chassis 1, 17 is a lower end connected to the bracket 16 via a shaft 18, and the tip of a piston rod 19 is connected via a shaft 20 to a shaft 15 of the tilt hinge bracket 14.
Is a hydraulic cylinder connected to a rear position of the shock absorber, a lower end of the shock absorber is connected to the shaft 11 and an upper end of the shock absorber is connected to a front position of the shaft 15 of the tilt hinge bracket 14 via a shaft 22, and 23 is a shock absorber. The air suspension is arranged between the upper surface of the lever 13 and the lower surface of the tilt hinge bracket 14 so as to be located near the sober 21.

In the present embodiment, when the cab 12 is tilted, the hydraulic cylinder 17 is operated after operating a cab lock release lever (not shown). Then, the cab 12 is tilted forward around the shaft 11 via the tilt hinge bracket 14 and the lever 13.

[0009]

In the cab-chassis coupling structure in the cab tilt mechanism shown in FIGS. 6 and 7, when the cab is deformed by a vehicle collision, the cab hinge bracket 3 and the bolt 4 are broken or cut. There is a risk that the cab may come off from the chassis 1, and in the cab-chassis coupling structure in the cab tilt mechanism shown in FIG. 8, all the bolts 10 are broken and cut at the same time due to a vehicle collision, and the cab 12 is broken into the chassis 1. May be detached from the vehicle, and the gap between the bolts 10 in the vehicle front-rear direction is narrow.
For example, even if one bolt remains without being broken or cut, the amount by which the cab 12 can move rearward is limited, and there is a problem that the remaining bolt is also broken or cut immediately.

In view of the above situation, the present invention prevents the cab from coming off the chassis even if the cab hinge bracket or the bolt is broken or cut, or a specific bolt among the bolts fixing the cab hinge bracket. The purpose is to prevent the bolt from breaking or cutting.

[0011]

To achieve the above object, in the first means of the present invention, a shaft is attached to a cab hinge bracket fixed to the chassis in the width direction of the chassis, and the shaft can be tilted. In a cab tilt mechanism that supports a cab, a shaft that is parallel to the shaft is attached to a bracket that is arranged on the chassis so that it is located rearward of the cab hinge bracket, and both shafts are stronger than the cab hinge bracket. And a cab hinge bracket is attached to the chassis via a plurality of bolts extending in the width direction, and the cab hinge is connected to the chassis by a rod adapted to be rotatable with respect to both the shafts. In a cab tilt mechanism in which a cab is supported by a bracket so that it can be tilted, a predetermined bolt among the above bolts is different from other bolts. Also a bolt of the large diameter is positioned toward the rear of the vehicle than the other bolt as well as a larger diameter.

[0012]

In the first means, even if the cab hinge bracket or bolt is broken or cut due to a vehicle collision and the cab moves, the rod rotates rearward around the bracket axis, so that the cab is separated from the chassis. There is nothing to do.

According to the second means, the large-diameter bolts are not broken or cut even if the bolts other than the large-diameter bolts are broken or cut due to the collision of the vehicle. Therefore, even if the cab is moved, the cab hinge bracket is used. Rotates backwards around a large-diameter bolt, so the cab never leaves the chassis.

[0014]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 to 4 show an embodiment of the present invention, in which a bracket 24 is arranged on the upper surface of the chassis 1 so as to be located rearward of the cab hinge bracket 3 in the vehicle. Attach the shaft 25 so that it is parallel.

The shaft 5 has a cab hinge bracket 3 attached thereto.
One end of a steel rod 26 is externally fitted and connected via a rubber bush 27, and the other end of the rod 26 is externally fitted and connected to a shaft 25 via a rubber bush 28 so as to be adjacent to.

When the cab is deformed due to a vehicle collision and the cab hinge bracket 3 or the bolt 4 is broken or cut,
Since the rod 26 is made of steel, it rotates rearward (clockwise) in FIG. 1 with respect to the shaft 25 without breaking or cutting.
Therefore, the connection between the chassis 1 and the cab is maintained by the rod 26, and it is possible to prevent the cab from coming off the chassis 1. That is, in this embodiment, the connection can be maintained even if the cab moves by the horizontal distance l.

Further, since the rubber bushes 27 and 28 are fitted in the connecting portions between the shafts 5 and 25 and the rod 26, the impact on the rod 26 at the time of vehicle collision can be reduced.

FIG. 5 shows another embodiment of the present invention. In this embodiment, among the four bolts 10 for fixing the cab hinge bracket 9 of FIG. 8, the bolt 10 located on the vehicle rear side of the chassis 1 is used. Bolt 29 with a larger diameter than the other bolts 10
And the bolt 29 having a large diameter is located rearward of the chassis 1 with respect to the other bolts 10, and the cab hinge bracket 9a is attached to the chassis 1 by the bolt 29 at the rear position.
I am trying to fix it against.

Even if an impact force acts on the cab 12 due to a vehicle collision, the force acting on the bolts 10, 29 is reduced by l1 / l2 as compared with the conventional one, and the bolt 29 has a larger diameter than the bolt 10. Therefore, the stress generated in the bolt 29 is also reduced (here, l1 is the horizontal distance between the bolts 10 and 10, and l2 is the horizontal distance between the bolts 10 and 29).

Therefore, even if the bolt 10 is broken or cut due to a vehicle collision, the bolt 29 is not broken or cut. Therefore, when the cab 12 moves rearward, the cab hinge bracket 9a is centered around the bolt 29. Rotate to the rear of 5 (clockwise). Therefore, the connection between the chassis 1 and the cab 12 is maintained by the cab hinge bracket 9a, and the cab 12 can be prevented from coming off the chassis 1. That is, also in the present embodiment, the connection can be maintained even if the cab 12 is deformed by the horizontal distance l.

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0023]

According to the cab and chassis coupling structure of the cab tilt mechanism of the present invention, in the case of claim 1, even if the cab hinge bracket or the bolt is broken or cut, the cab is prevented from separating from the chassis frame. According to the second aspect of the present invention, the large-diameter bolt fixing the cab hinge bracket does not break or break even if other bolts break or break, so the cab must be removed from the chassis frame. It is possible to exert an excellent effect that it can be prevented.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of a combined structure of a cab and a chassis in a cab tilt mechanism of the present invention.

FIG. 2 is a view taken along the line II-II in FIG.

3 is a perspective view of the bracket shown in FIG. 1. FIG.

4 is a front view of the rod shown in FIG. 1. FIG.

FIG. 5 is a side view of another embodiment of the combined structure of the cab and the chassis in the cab tilt mechanism of the present invention.

FIG. 6 is a side view of an example of a combined structure of a cab and a chassis in a conventional cab tilt mechanism that tilts a cab with a torsion bar.

FIG. 7 is a view taken in the direction of arrow VII-VII in FIG.

FIG. 8 is a side view of another example of the combined structure of the cab and the chassis in the conventional cab tilt mechanism in which the cab is tilted by the hydraulic cylinder.

[Explanation of symbols]

 1 Chassis 3 Cab Hinge Bracket 4 Bolt 5 Shaft 9a Cab Hinge Bracket 10 Bolt 12 Cab 24 Bracket 25 Shaft 26 Rod 29 Bolt

Claims (2)

[Claims] 1. A cab tilt mechanism in which a shaft is attached to a cab hinge bracket fixed to a chassis in the width direction of the chassis, and a cab is supported on the shaft so as to be tiltable. The cab tilt mechanism is located rearward of the cab hinge bracket. A shaft parallel to the shaft is attached to the bracket arranged on the chassis, and both shafts are connected by a rod having higher strength than the cab hinge bracket and capable of rotating with respect to the both shafts. The combined structure of the cab and chassis in the characteristic cab tilt mechanism. 2. A cab tilt mechanism in which a cab hinge bracket is attached to a chassis through a plurality of bolts extending in the width direction, and the cab is supported by the cab hinge bracket so that the cab can be tilted. The cab and chassis coupling structure in the cab tilt mechanism is characterized in that the bolt has a larger diameter than the other bolts and the larger diameter bolt is located rearward of the other bolts.