JP2500210Y2 - Cab mounting device for cab-over truck - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a cab mounting device for a cab-over type truck.

(Prior Art) A cab-over type truck in which a lower portion of a front end of a cab is pivotally supported near a front end of a chassis frame in order to easily perform maintenance and inspection of an engine and the like arranged below the cab. In order to assist the operator's operation force when tilting up the cab, a torsion bar that elastically biases the cab in the tilt up direction when the cab is in the normal tilt down position is provided. Cab mounting devices are known in the art.

Further, in order to improve the riding comfort, the other end eyeball portion of the U-shaped leaf spring, one end of which is fixed to the lower portion of the front end of the cab, is pivotally supported on the cabultant shaft supported by the cab hinge bracket. Cab suspension systems have already been proposed.

Now, an example of the configuration of this type of cab mounting device will be described with reference to the exploded perspective view of FIG. 3 and the schematic side view of FIG.
Reference numeral 10 in the figure indicates a pair of left and right side rails 12 having a groove-shaped cross section and extending in the vehicle front-rear direction, and a plurality of cross members 14 fixed at both ends to the left and right side rails 12 and arranged in the vehicle width direction. The undercarriage frame that is
A pair of left and right cab hinge brackets 16l at the front end of 10
And 16r are fixed.

The cab hinge brackets 16l and 16r have upper and lower torsion bars extending in the vehicle width direction and parallel to each other.
18 and 20 are mounted. First torsion bar on top
The bracket 16l has a spline or serration portion 22 formed at one end thereof, that is, the left end portion in the case shown.
Is fixed with respect to rotation around the axis by being fitted into a fitting hole having a spline or serration, and the other end, that is, the right end, is rotatably supported in a corresponding bearing hole of the bracket 16r. It is supported. Further, the right end movable end portion of the first torsion bar 18 extends to the outside of the vehicle body beyond the bearing hole of the bracket 16r, and the spline or serration portion 24 formed on the extension portion has a right side, that is, a first torsion bar arm. One end of 26r is fixedly mounted for rotation around the axis.

The lower second torsion bar 20 has a spline or serration portion 28 formed at one end thereof, that is, the right end portion in the figure, fitted into a fitting hole having a spline or serration provided in the bracket 16r. Thus, the other end, that is, the left end is fixed with respect to the rotation about the axis, and is rotatably supported in the corresponding bearing hole of the bracket 16l. The left end movable end portion of the second torsion bar 20 extends outside the vehicle body beyond the bearing hole of the bracket 16l and is on the left side of the spline or serration portion 30 formed in the extension portion, that is, the second end. Torsion bar arm
26l is fixedly mounted for rotation about the axis.

On the other hand, the left and right U-shaped leaf springs 36l and 36r are attached to the lower front end portions of a pair of left and right main sills or underframes 32l and 32r fixed to the floor of the cab C and extending in the vehicle front-rear direction via brackets 34, respectively. The upper end of the is fixed by bolts or the like. The eyeball portions 38l and 38r at the other ends of the left and right leaf springs 36l and 36r are the rubber bushes 4
It is pivotally mounted on the first torsion bar 18 via 0l and 40r.

In addition, the first and second torsion bar arms 26l
The free ends 42l and 42r of 26r and 26r are
The slide bases 44 mounted on the lower sides of the 32r slidably abut.

As shown by the solid line in FIG. 4, the cab C is elastically locked via a spring 48 to an inverted U-shaped cab bridge 46 that is installed between the left and right side rails 12 of the chassis frame 10. In the normal state where the cab C is in its normal state, its own weight is applied via the spring force of the U-shaped leaf springs 36l and 36r and the torsion bar arms 26l and 26r.
Also, it is mounted on the chassis frame 10 supported by the spring force of the second torsion bar arms 18 and 20, and further by the spring force of the spring 48.

When tilting up the cab C for engine maintenance, inspection, etc., place the rear end of the cab C at the cab bridge 46.
When the cab C is unlocked by unlocking the latch (not shown) and the cab C is manually lifted as shown by the alternate long and short dash line in FIG. 4,
The cab C rotates counterclockwise in the figure around the tilt axis, that is, the first torsion bar 18 in this example. At the initial stage of this rotation, the tilting operation labor is reduced by the twisting force P _t of the first and second torsion bars 18 and 20.

When the tilt rotation angle of the cab reaches a preset angle, the twisting force of the first and second torsion bars 18 and 20 disappears, and the total weight of the cab C is the U-shaped leaf spring at the front end.
Since it acts on 36l and 36r, the leaf springs 36l and 36r are largely deflected, and the cab C descends or sinks as shown by the dotted arrow A in the figure. Therefore, the U-shaped leaf spring 36l
There is a risk that a large stress will be generated on and 36r, causing damage. Further, if the leaf springs 36l and 36r are made strong so that there is no fear of damage, there is a problem that the spring constant increases and the riding comfort deteriorates. Further, since the cab is supported by the U-shaped leaf spring in a state where the cab is tilted up, there is a drawback that the supporting state becomes unstable.

(Problems to be Solved by the Invention) The present invention has been devised in view of the above circumstances, and the front end portion is supported by a U-shaped plate spring by a U-shaped plate spring, and a chassis frame is used to reduce the tilt-up operation labor. In a cab of a type having a torsion bar interposed between the cab and the cab, it is possible to prevent excessive stress from being generated in the U-shaped leaf spring at the time of tilting up, and to ensure excellent riding comfort. It is an object of the present invention to provide a cab mounting device for a cab-over type truck.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a pair of left and right cab hinge brackets disposed near the front end of a chassis frame, one end of which is fixed to one of the cab hinge brackets. And the other end of the cab hinge bracket is rotatably supported by the other end of the cab hinge bracket to bias the cab in the tilt-up direction, and one end is fixed to the lower part of the front end of the cab and the other end is attached to the torsion bar or the above. A U-shaped leaf spring pivotally supported by a separately provided tilt shaft supported by a cab hinge bracket. By contacting a lower portion of a front end of the cab when the cab is tilted up. A stopper member that restricts the lowering of the front end of the cab to prevent excessive deformation of the U-shaped leaf spring is
A tubular portion externally fitted to the torsion bar or the tilt shaft disposed between the other end of the U-shaped leaf spring and the cab hinge bracket, and fixed to the cab hinge bracket by being coupled to the tubular portion. Roller bracket,
The roller bracket is rotatably supported by the roller bracket and an abutting member provided on the cab side with a sufficient gap that does not abut the roller during normal traveling. A cab mounting device for a cab-over type truck is proposed.

(Operation) According to the present invention, when the cab is tilted up and rotated, the lower portion of the front end of the cab comes into contact with the stopper member and the descent of the cab is restricted. As a result, excessive deformation of the U-shaped leaf spring is suppressed. The cab is prevented from being damaged, and the cab is stably supported when tilting up. Therefore, U
A soft spring having a small spring constant can be used for the letter-shaped leaf spring, and excellent riding comfort can be secured.

(Embodiment) An embodiment of the present invention will be specifically described below with reference to FIGS. 1 and 2. FIG. (Note that re-statement is omitted for matters already described with reference to FIG. 3 and FIG. 4.) FIG. 1 is an enlarged left side of the chassis frame 10 and the front end of the lower end of the cab C. FIG. 2 is a plan view, and FIG. 2 is an enlarged front view of FIG. 1 with a part thereof shown in cross section.

As shown, the first torsion bar is provided on the left and right cab hinge brackets 16l and 16r (however, although the left bracket 16l is shown in the figure, the right bracket 16r is also substantially the same). Plate-shaped roller brackets 52 each having a tubular portion 50 that is fitted onto each end of 18 are fixed by bolts 54. Each roller bracket 52
A roller shaft 56 is fixed to the upper end portion of the roller shaft 56, and a rollable roller 58 is mounted on the roller shaft 56. Meanwhile, cab C
The rollers 58 are attached to the outer surfaces of the front ends of the main sills 32l and 32r.
An abutment member 60 cooperating with is fixed.

According to the above configuration, during normal traveling of the truck, a sufficient gap L is provided between the roller 58 and the abutment member 60 fixed to the lower portion of the cab front end, that is, the outside of the main sills 32l and 32r.
Is formed, the cab C can be elastically displaced in the vertical direction during traveling. Next, as described above with reference to FIG. 4, when the cab C is tilted up for maintenance and inspection of the engine and the like, the tilt rotation angle is a preset angle, that is, the first and second torsion bars. 18 and
When the twisting force of 20 reaches the vicinity of the rotation angle where it disappears, the abutting member 60 abuts against the roller 58 and the descent or sinking of the cab C is restricted, so that the U-shaped leaf springs 36l and 36r become excessive. There is an advantage that it is possible to surely prevent damage due to excessive deformation without causing bending, and the cab is supported extremely stably in the tilted-up state. Also, the leaf spring 36
Since l and 36r do not excessively deform, a soft spring having a small spring constant can be safely used, and excellent riding comfort can be secured.

In the above embodiment, when the cab C is tilted up, the roller 58 is used as a stopper member that comes into contact with the lower portion of the front end of the cab to limit the lowering of the cab. Etc. can be appropriately adopted. Further, in the above embodiment, the torsion bar
U-shaped leaf spring 36 on the same torsion bar with 18 as tilt axis
Although the eyeball portions 38l and 38r of l and 36r are pivotally supported, a tilt shaft separate from the torsion bar can be provided on the cab hinge brackets 16l and 16r.

(Effects of the Invention) As described above, the cab mounting device for a cab-over truck according to the present invention is a set of left and right cab hinge brackets disposed near the front end of the chassis frame, and one end of which is the cab hinge bracket. A torsion bar fixed to one side and rotatably supported to the other side of the cab hinge bracket to urge the cab in the tilt-up direction, and one end fixed to the lower part of the front end of the cab and the other end A U-shaped leaf spring pivotally supported by a separately provided tilt shaft supported by the torsion bar or the cab hinge bracket, wherein a lower part of a front end of the cab when the cab is tilted up. A stopper member that restricts the downward movement of the front end of the cab by restraining the front end of the cab to prevent excessive deformation of the U-shaped leaf spring is provided on the upper side of the U-shaped leaf spring. A tubular portion externally fitted to the torsion bar or the tilt shaft disposed between the other end and the cab hinge bracket, a roller bracket coupled to the tubular portion and fixed to the cab hinge bracket, and a roller It is excellent in that it is composed of a roller rotatably supported by a bracket and an abutting member provided on the cab side with a sufficient gap that does not abut the roller during normal running. While ensuring riding comfort, the U-shaped leaf spring can be prevented from being damaged, its durability and reliability can be improved, and the cab can be stably supported during tilt-up.

[Brief description of drawings]

FIG. 1 is a left side view showing an embodiment of a cab mounting device according to the present invention, FIG. 2 is a front view of FIG. 1 showing a part in section, and FIG. FIG. 4 is an exploded perspective view of the cab mounting device, and FIG. 4 is a schematic side view of the cab mounting device shown in FIG. 10 …… chassis frame, 12 …… side rails, 16l and 16r
...... Cab hinge bracket, 18 ...... First torsion bar, 20 ...... Second torsion bar, 26l and 26r ...... Torsion bar arm, 32l and 32r ...... Main sill, 36l and 3
6r …… U-shaped leaf spring, 52 …… Roller bracket, 58 ……
Roller (stopper member), 60 ... Abutting member.

Claims (1)

(57) [Scope of utility model registration request] 1. A pair of left and right cab hinge brackets arranged near the front end of a chassis frame, one end of which is fixed to one of the cab hinge brackets and the other end of which is rotatably supported by the other of the cab hinge brackets. And a torsion bar for urging the cab in the tilt-up direction, and one end fixed to the lower part of the front end of the cab and the other end pivotally supported on a separate tilt shaft supported by the torsion bar or the cab hinge bracket. In the above-mentioned U-shaped leaf spring, when the cab is tilted up, the lower end of the front end of the cab is brought into contact with the lower portion of the cab to limit the descent of the front end of the cab. A torsion bar is provided between the other end of the U-shaped leaf spring and the cab hinge bracket, and a stopper member for suppressing excessive deformation of the torsion bar. Is a tubular portion externally fitted to the tilt shaft, a roller bracket coupled to the tubular portion and fixed to the cab hinge bracket, a roller rotatably supported by the roller bracket, and a roller roller that is supported during normal traveling. A cab mounting device for a cab-over type truck, which is composed of an abutting member provided on the cab side with a sufficient gap that does not contact.