JP3280899B2 - Cab-chassis coupling structure in cab tilt mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cab-tilt coupling structure for a cab tilt mechanism in which the strength of a cab hinge bracket can be easily set and the cab can be prevented from coming off.

[0002]

2. Description of the Related Art A cab for tilting a cab is connected to a chassis via a cab hinge bracket. Examples of a cab-tilt coupling structure in such a cab tilt mechanism are shown in FIGS. 3 , 4 and 5. FIG. Have been.

FIGS. 3 and 4 show an example in which a cab tilt is performed by a torsion bar.
Is a cab floor frame, 3 is a cast cab hinge bracket fixed via four bolts 4 near the front end side surface of the chassis 1, and 5 is mounted on the upper end of the cab hinge bracket 3 so as to extend in the width direction of the chassis 1. A cab 12 is supported on the shaft 5 via a bracket 6 attached to a lower portion of the front end of the cab floor frame 2 so as to be tiltable.

[0004] Reference numeral 7 denotes two torsion bars attached to the cab hinge bracket 3 so as to be located below the shaft 5 and parallel to the shaft 5, and 8 denotes a cab floor whose base end is attached to the torsion bar 7 and whose tip is a cab floor. The lever supports the lower surface of the frame 2.

At the time of cab tilt, when a cab lock release lever (not shown) provided between the back of the cab 12 and the carrier is operated, the cab floor frame 2 is pushed through the lever 8 by the torsion force of the torsion bar 7. Is raised, so that the cab 12 is tilted forward about the axis 5.

FIG. 5 shows an example in which cab tilting is performed by a hydraulic cylinder. In the figure, reference numeral 9 denotes a casting fixed to the vicinity of the front end side surface of the chassis 1 via four bolts 10 extending in the width direction of the chassis 1. 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 so as to be tiltable.

A lever 13 is attached to the shaft 11 and extends substantially horizontally rearward. A tilt hinge bracket 14 is attached to a substantially central portion in the longitudinal direction of the lever 13 via a shaft 15 parallel to the shaft 11. 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 a distal end of a piston rod 19 via a shaft 20 to a shaft 15 of the tilt hinge bracket 14.
A hydraulic cylinder 21 connected to a position further rearward, a shock absorber 21 having a lower end connected to the shaft 11 and an upper end connected to a position forward of the shaft 15 of the tilt hinge bracket 14 via a shaft 22, and 23 a shock absorber. This is an air suspension 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 Zorba 21.

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

[0009]

In the cab / chassis coupling structure of the cab tilt mechanism shown in FIGS. 3 and 4, when the cab 12 is deformed by the collision of the vehicle, the cab hinge bracket 3 or the bolt 4 is broken or cut. There is a possibility that the collision energy of the cab 12 may not be sufficiently transmitted to the chassis 1 due to loss, and that the cab 12 may be separated from the chassis 1. In the combined structure of the cab and the chassis in the cab tilt mechanism shown in FIG. 5 , all the bolts 10 are broken or cut due to the collision of the vehicle, and the collision energy applied to the cab 12 is not sufficiently transmitted to the chassis 1, and the cab 12 There is a problem that the collision energy received is large, and the cab 12 may be separated from the chassis 1.

[0010] That is, when the intensity of the bolt 4 is small relative to the cab hinge bracket 3, as shown in FIG. 6,
The plurality of bolts 4 are broken by the impact in the direction of the arrow due to the collision, and finally the remaining bolts 4 are also broken, and the collision energy applied to the cab 12 is not sufficiently transmitted to the chassis 1 or the cab 12 falls off. There is a fear. If the strength of the bolt 4 is higher than that of the cab hinge bracket 3, as shown in FIG. 7 , the cab hinge bracket 3 is deformed by the impact in the direction of the arrow due to the collision, and the collision energy similarly applied to the cab 12 is increased. May not be transmitted sufficiently to the chassis 1 or the cab 12 may fall off.

[0011] The cab hinge bracket 3 and the bolt 4, it is necessary to have a function of deformation for cushioning the impact of the collision, in the conventional structure shown in FIGS. 3-7, a cab hinge bracket It is difficult to set the balance between the strength of the bolt 3 and the bolt 4, and the collision energy received by the cab 12 due to the breakage of the cab hinge bracket 3 or the bolt 4 cannot be sufficiently transmitted to the chassis 1, or the cab 12 falls off. There was a possibility that it would happen.

In view of the above circumstances, the present invention allows the strength setting bolt to break when the cab hinge bracket receives an impact, and sufficiently transmits the collision energy received by the cab to the chassis even if the strength setting bolt breaks. By doing so, the object of the present invention is to reduce the deformation of the cab and to prevent the cab from falling off.

[0013]

In order to achieve the above object, a cab-tilt coupling structure of a cab tilt mechanism according to the present invention comprises a cab hinge bracket 3 fixed to a chassis 1 and a shaft extending in the width direction of the chassis 1. 5 attached to, the cab tilt mechanism is supported tilt capable cab 12 to the axis 5, the chassis 1, the lower surface of the chassis 1
A cap having an extended portion 3 'formed so as to extend further downward.
Place the hinge bracket 3 on the bottom of the chassis 1
Bracket 26 formed along the overhang portion 3 '
And fix the cab hinge to the bracket 26.
The projecting portion 3 ′ of the bracket 3 is connected to one strength pin 24.
Cab hinge bracket.
A plurality of strength setting bolts above the overhang 3 'of the
25, the chassis 1 is fixed to the side and top surfaces of the chassis 1 .

According to the present invention, even if the strength setting bolt for fixing the cab hinge bracket to the chassis is broken due to the collision of the vehicle, the cab hinge bracket is rotated around the strength pin and connected to the chassis. By being held, the cab hinge bracket is connected to the chassis by a tensile force via the strength pin, so that the collision energy received by the cab can be transmitted to the chassis,
Also, the cab does not separate from the chassis.

Further, by setting the cross-sectional area of the strength setting bolt, the strength when the strength setting bolt is broken and the cab hinge bracket rotates when subjected to an impact can be easily and arbitrarily set. Can be.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

[0017] Figure 1 shows one example of the mode for carrying out the present invention, sheet catcher to 1, a cab hinge bracket flared portion 3 'is formed so as to further overhangs downwardly from the lower surface of the chassis 1 3 and a bracket 26 formed along the overhang 3 ′ is fixed to the lower surface of the chassis 1, and the overhang 3 ′ of the cab hinge bracket 3 is fixed to the bracket 26 by one strength pin 24. The cab hinge bracket 3 is fixed to the chassis 1 by a plurality of strength setting bolts 25 as shown in FIG .

The strength pins 24 are , as shown in FIG.
At one end of the pin body 27, there is a retaining flange 30.
The other end has a bolted bolt portion 31, and a nut 33 is fastened to the bolt portion 31 via a stopper plate 32, so that the flange 30 and the stopper plate 32
Between the cab hinge bracket 3 and the chassis 1.
May be rotatably connected. Strength pin 24 of FIG. 1 shows a case where the rotatably connected cab hinge bracket 3 to the bracket 26 by adopting the configuration of FIG.

[0019] The strength pin 24 is so as to connect the cab hinge bracket 3 in greater strength fat racket 26 has a larger cross-sectional area, also the intensity setting bolt 2
5 has a smaller cross-sectional area than the strength pin 24;
It is made to break by the shearing force by a predetermined impact.

Next, the operation of the above embodiment will be described.

The cab 12 (see FIG. 3 ) due to the collision of the vehicle
And when an impact force acts on the cab hinge bracket 3,
Strong degree when the impact force is larger than the predetermined value set bolt 25
Break due to shearing force. At this time, since the strength pin 24 has a high strength with a large cross section, the cab hinge bracket 3 rotates around the strength pin 24.

As described above, when an impact force equal to or more than a predetermined value acts on the cab hinge bracket 3, the strength setting bolt 25 is broken and the cab hinge bracket 3 is inclined, thereby absorbing the impact force at the time of collision. Become like

Further, even if the strength setting bolt 25 is broken by an impact force, the strength pin 24 has a high strength with a large sectional area, so that the cab hinge bracket 3 is securely connected to the chassis 1. At this time, since the cab hinge bracket 3 is maintained in a state of being connected to the chassis 1 by a tensile force via the strength pin 24, it can withstand a large force, and the cab 12 (see FIG. 3 ) receives a collision. Energy can be transmitted to the chassis 1 and the cab 12 is prevented from detaching from the chassis 1.

By setting the sectional area of the strength setting bolt 25, the strength at which the strength setting bolt 25 is broken when the cab hinge bracket 3 receives an impact force can be adjusted and set arbitrarily. it can.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the gist of the present invention.

[0026]

According to the cab-tilt coupling structure of the cab tilt mechanism of the present invention, even if the strength setting bolt fixing the cab hinge bracket to the chassis is broken due to a collision of the vehicle, the cab hinge bracket has the strength pin. The cab hinge bracket is connected to the chassis by a tensile force via a strength pin by rotating the cab around the cab hinge bracket so that the collision energy received by the cab is reduced. The cab can be transmitted to the chassis, the amount of deformation of the cab can be reduced, and the cab does not separate from the chassis.

Further, by setting the cross-sectional area of the strength setting bolt, the strength at the time when the strength setting bolt is broken and the cab hinge bracket is rotated upon receiving an impact can be easily set arbitrarily. Can be.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a cab-chassis coupling structure in a cab tilt mechanism of the present invention.

FIG. 2 is a side view showing an example of a strength pin.

FIG. 3 is a side view of an example of a combined structure of a cab and a chassis in a conventional cab tilt mechanism for tilting a cab by a torsion bar.

FIG. 4 is a view taken in the direction of arrows IV-IV in FIG. 3;

FIG. 5 is a side view of another example of the combined structure of the cab and the chassis in the conventional cab tilt mechanism for tilting the cab by a hydraulic cylinder.

FIG. 6 is a schematic side view showing an example of the operation of the conventional structure.

FIG. 7 is a schematic side view showing another example of the operation of the conventional structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Chassis 3 Cab hinge bracket 3 ' Overhang part 5 axis 12 Cab 24 Strength pin 25 Strength setting bolt

Claims (1)

(57) [Claims] A cab hinge bracket (3) fixed to a chassis (1) has a shaft (5) extending in the width direction of the chassis (1).
And a cab (12) that can be tilted to the shaft (5).
In the cab tilt mechanism is supported, the chassis
In (1), the chassis (1) extends further downward from the lower surface.
Hinge Bra with Overhang (3 ') Formed
A bracket (3) is arranged, and the lower surface of the chassis (1) is
A bracket (2) formed along the overhang (3 ')
6) and fix the cap to the bracket (26).
The overhanging part (3 ') of the hinge hinge (3) is
It is rotatably mounted by a strength pin (24).
From the overhang (3 ') of the cab hinge bracket (3)
The upper part is secured by a plurality of strength setting bolts (25).
A cab-and-chassis coupling structure in a cab tilt mechanism, wherein the cab and the chassis are fixed to a side surface and an upper surface of (1) .