JPS6134942Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of a tail-cab type automobile.

Conventionally, this type of tail-cabin type vehicle was
A hydraulic jack is used to rotate the cab relative to the chassis about the tail pin, to raise the cab from the riding position to the tipped position, and to lower the cab from the tipped position to the riding position.
Equipped with a hydraulic operating cylinder.

However, since the cab is resiliently supported on the chassis, the operating cylinder is provided with means for allowing free movement of the cab on the chassis and for tilting the cab from the riding position. Means have been provided to inhibit the movement of the cab relative to the shaft in the overtilt range, where the center of gravity of the cab is tilted forward beyond the tail shaft.

A mechanical arrangement of these means is disclosed, for example, in British Patent No. 1,399,612, and a hydraulic circuit arrangement is disclosed and used in US Pat. No. 1,447,673, respectively.

However, in the former case, the piston is installed in the bearing hole of the trunnion, which is rotatably held in the cab bracket.
Since the hydraulic jack is connected to the cab by fitting the rods together so that they can slide back and forth, it is difficult to ensure smooth free movement of the cab relative to the chassis. The trunnions had to be made thicker or expensive materials were used, and the latter were structurally more complex than the mechanical former, requiring advanced techniques to manufacture, and were expensive.

The purpose of this invention is to provide a means for smoothing the free movement of the cab when the cab is in the riding position relative to the chassis, i.e. in a running position, and to allow the cab to move around the tail shaft relative to the chassis. A cab having means for reliably suppressing the tilting movement of the cab relative to the shaft when the cab is lifted from a riding position to a tilting position and the cab tilts forward with the center of gravity of the cab passing over the tail shaft.・Equipped with a tilt means, the means for smoothing the free movement of the cab and the means for suppressing the tilting movement of the cab improve mechanical strength, simplify the structure, and reduce the number of parts without increasing the size. The purpose of the present invention is to provide a tail-cab type automobile that reduces manufacturing costs.

To solve these problems, this idea
A cab-type motor vehicle has a chassis, and a seat rotatably coupled to the chassis via a tail shaft in front of the chassis so as to be rotated between a riding position and a tilted position, and a seat mounted on the chassis. a resiliently supported cab, a cylinder, a piston fitted in the cylinder for reciprocating sliding, and one end removable from the outside of one end of the cylinder and the other end fixed to the piston. a hydraulic operating cylinder consisting of an operating rod, the other end of which is rotatably connected to the shaft at the rear of the tail shaft, and a connecting portion disposed at one end of the operating rod of the operating cylinder; A long hole formed in either the connecting part or the cab, a connecting pin passed through the long hole and fixed to the other of the connecting part or the cab, and a length that is approximately the same as the operating rod. a stopper bar, which has a stopper groove at one end and is pressed against the outer surface of the cylinder, and whose other end is rotatably attached to the cab side; and when the cab is lifted from the riding position to the tilting position around the tail shaft relative to the chassis and the tilting angle of the cab reaches a predetermined angle, the stopper
The bar includes a protrusion that is hooked into the stopper groove of the bar.

Hereinafter, preferred specific examples of the tail-cab type automobile according to this invention will be described with reference to the drawings.

1 and 2 illustrate a tail-cab motor vehicle 10 of the present invention embodied as a tail-cab truck.

The tail cab type truck 10 is rotatably connected to the chassis 11 via a tail shaft 24 in front of the chassis 11 so as to be rotated between the riding position and the tilted position. A cab 12 disposed on the chassis 11, and a cab 12 connected between the front of the cab 12 and the front of the chassis 11.
left and right cab front suspensions 13 which are elastically supported on the chassis 11, and a cab in which the rear of the cab 12 is connected to the chassis 11 and the cab 12 is elastically supported on the chassis 11. a rear mount (not shown) with its chassis 11 and its cab 12 behind its cab front suspension 13 so as to rotate its cab 12 between the riding position and the reclining position; A hydraulic operating cylinder 14 disposed therebetween, a connecting portion 15 disposed integrally with one end of the operating rod 32 of the operating cylinder 14, and a connecting portion 15 disposed at the rear of the cab front suspension 13. The elongated hole 16 formed in the upper bracket 22 on the cab 12 side, the connecting pin 17 passed through the elongated hole 16 and fixed to the connecting portion 15, and the operating rod 32 have approximately the same length. A stopper bar 18 has one end provided with a stopper groove 19 and pressed against the outer surface side of the cylinder 31 of the operating cylinder 14, and the other end rotatably attached to the upper bracket 22 on the cab 12 side. The cab 12 is placed on one end side of the cylinder 31 of the operation cylinder 14, and the cab 12 is lifted around the tail shaft 24 from the riding position to the tilted position with respect to the shaft 11, and the tilt angle of the cab 12 is adjusted. When a predetermined angle is reached, a protrusion 20 is hooked onto the stopper groove 19 of the stopper bar 18.
In order to secure the cab 12 to the chassis 11 in the riding position of the cab 12, a cab lock device (not shown) is provided between the rear of the cab 12 and the cab rear mount. ).

Left and right cab front suspension 13
respectively, a lower bracket 21 bolted to the chassis 11, an upper bracket 22 bolted to the underside of the cab 12 in front of the cab 12, and a track 10, i.e. in the longitudinal direction of the chassis 11, respectively. a longitudinal link 23 extending and disposed on its upper and lower brackets 21, 22; a tail shaft 24 rotatably connecting the forward end of the longitudinal link 23 to its lower bracket 21; a coupling shaft 25 rotatably connecting the rear end of the link 23 to its upper bracket 22; and a coil spring disposed between a spring seat 29 of its upper bracket 22 and a spring seat 28 of its longitudinal link 23. 26, and a shock absorber 27 rotatably connected to the tail shaft 24 at one end and to the pin 30 of the upper bracket 22 at the other end.

The fluid pressure type operation cylinder 14 is a hydraulic cylinder, and includes a cylinder 31, a piston (not shown) fitted in the cylinder 31 so as to be able to reciprocate and slide, and one end side of which can be inserted into and taken out from the outside of one end of the cylinder 31. The cylinder 31 is configured to include an operating rod 32 whose other end is fixed to the piston, and the cylinder 31 is connected to a hydraulic power source device,
It is connected via pipes 36 and 37 to a hydraulic unit (not shown) including a control valve and the like.

The cylinder 31 is placed at an appropriate distance behind the tail shaft 24 and has its other end rotatably connected to the shaft 11 via a pin 33.

Furthermore, a connecting portion 15 that is connected to the upper bracket 22 side is integrally formed at one end of the operating rod 32.

Of course, the operating cylinder 14 is the first and second
As shown in the figure, the connecting portion 15 is located on the upper bracket 22 side, and the upper bracket 22 has a long hole 16 at a position corresponding to the connecting portion 15. ,
It is formed along the axial direction of the operating rod 32.

The connecting pin 17 connects one end of the operating rod 32, that is, the connecting portion 15, to the elongated hole 1.
6 and is rotatably supported, and is fixed to the connecting portion 15 so as to pass through the elongated hole 16.

The stopper bar 18 is connected to the operating cylinder 14.
It has approximately the same length as the operating rod 32 of the cylinder 31, has a stopper groove 19 at one end and is pressed against the outer surface of the cylinder 31, and has the other end rotatably attached via a pin 34 at a position closer to the rear than the long hole 16 in the upper bracket 22.

Of course, spring means may be used to force one end of the stopper bar 18 against the outer surface of the cylinder 31, e.g. one end of a coil spring (not shown) may
8 side, and the other end is attached to the upper bracket 22 side.

At one end of the stopper bar 18 and at the portion pressed against the outer surface of the cylinder 31, a plurality of serrated rack portions 35, 35, 35 are provided.
are formed at appropriate intervals.

Further, on one end side of the cylinder 31 of the operating cylinder 14, a stopper groove 19 of the stopper bar 18 and a rack portion 35, 35, 35 are provided.
A flange-type protrusion 20 that is hooked on is integrally formed.

That is, when the cab 12 is lifted from the riding position to the tilted position around the tail shaft 24 relative to the chassis 11 and the center of gravity of the cab 12 reaches near the top of the tail shaft 24, That Stopper Bar 1
8 and acts to prevent the cab 12 from tilting further forward.

Of course, in such a tilting movement of the cab 12, the projections 20 are successively hooked onto the rack portions 35 of the stopper bar 18 to prevent the cab 12 from being erroneously lowered and to 12 can be reliably tilted.

In addition, when returning the cab 12 from the tilted position to the riding position, the protrusion 20 and the stopper groove 1
The stopper bar 18 is rotated rearward to release the engagement with the stopper bar 9, but a release mechanism (not shown) may be provided to mechanically rotate the stopper bar 18. For example, the release mechanism may include a switching lever (not shown) that controls the supply of pressure oil to the operating cylinder 14.
a wire (not shown), a link (not shown), in the vicinity of which the stopper bar 18 can be rotated;
It consists of a release lever (not shown), etc.

Next, the cab-tailing operation of the above-mentioned truck 10 will be explained.

In the truck 10, if the cab 12 is placed in the riding position as shown in FIG. The connecting pin 17 fixed to the upper bracket 15 is housed in a long hole 16 formed in the upper bracket 22, and since the long hole 16 is formed along the axial direction of the operating rod 32, the cab 12
relative movement with respect to the chassis 11 is allowed, and the cab 12 is elastically supported on the chassis 11. As a result, when the truck 10 is running, vibrations on the chassis 11 side are directly transmitted to the cab 12 side. This prevents the deterioration of the riding comfort of the cab 12 due to the locking action of the operating cylinder 14.

Further, when the cab 12 is lifted from the riding position to the tilted position, when the operating cylinder 14 is driven and the operating rod 32 is pushed out, the connecting pin 17 fixed to the connecting portion 15
is slid upwardly along slot 16 in upper bracket 22.

Of course, in such a sliding state of the connecting pin 17, the pushing up force by the operating cylinder 14 is not transmitted to the cab 12 side before the connecting pin 17 contacts the upper end of the elongated hole 16. .

When the operating rod 32 is further pushed out and the connecting pin 17 contacts the upper end of the elongated hole 16, the pushing force from the operating cylinder 14 is applied to the cab 12 side, that is, the upper bracket 22.
The cab 12 is rotated around the tail shaft 24 and raised from the riding position to the tilted position.

When the center of gravity of the cab reaches near the top of the tail shaft 24, one end of the stopper bar 18, that is, the tip, is pressed against the outer side of the cylinder 31, so that the protrusion 20 on the cylinder 31 moves toward the stopper bar 18. It is caught in the stopper groove 19 of the bar 18 and prevents the cab 12 from tilting further forward.

Therefore, the tilted state of the cab 12 is reliably maintained, making it possible to safely perform inspection and maintenance work on the engine in the truck 10.

Of course, when the cab 12 is returned from the tilted position to the riding position, the stopper bar 18 is rotated so as to release the engagement between the projection 20 and the stopper groove 19, and The operating cylinder 14 returns the cab 12 to the riding position.

In addition, when the cab 12 is returned to the riding position and the driving of the operating cylinder 14 is stopped, the connecting pin 17 is separated from the upper end of the elongated hole 16, and as shown in FIG. Of course, it is located approximately at the center of the hole 16.

In the above-mentioned tailed cab type truck 10,
The long hole 16 is formed in the upper bracket 22 on the cab 12 side, and the connecting pin 17 is formed in the upper bracket 22 on the cab 12 side.
was described as being fixed to the connecting portion 15 of the operating rod 32, but the elongated hole 16 is formed in the connecting portion 15 of the operating rod 32, and the connecting pin 17 is fixed to the connecting portion 15 of the operating rod 32. It is also possible to fix it to the upper bracket 22 of the.

According to the above-mentioned invention, a hydraulic operating cylinder includes a cylinder, a piston fitted in the cylinder so as to be able to reciprocate and slide, and one end of which can be inserted into and taken out from the outside of one end of the cylinder, and the other end of which can be inserted into and taken out of the outside of one end of the cylinder. consists of an operating rod fixed to the piston, the other end of the cylinder is rotatably connected to the shaft at the rear of the tail shaft, and the connecting portion is disposed at one end of the operating rod of the operating cylinder. a long hole is formed in one of the connecting part and the cab, a connecting pin is passed through the long hole and fixed to the other of the connecting part and the cab, and the stopper bar is It has approximately the same length as the operating rod, one end is provided with a stopper groove and pressed against the outer side of the cylinder, the other end is rotatably attached to the cab side, and the protrusion is attached to the outer surface of the cylinder. The stopper bar is disposed at one end of the cylinder, and when the cab is lifted around the tail shaft from the riding position to the tilting position relative to the chassis and the tilting angle of the cab reaches a predetermined angle, the stopper bar is Since the cab is configured to be hooked onto the stopper groove, when the cab is in the riding position with respect to the chassis, that is, in the running position, the cab can smoothly move freely, and the cab can be easily moved relative to the chassis. The cab is lifted from the riding position to the tilted position around the tail shaft, and the center of gravity of the cab is raised around the tail shaft.
When the cab tries to tilt forward beyond the shaft, the protrusion at one end of the cylinder gets caught in the stopper groove at the tip of the stopper bar, thereby suppressing the tilting movement of the cab relative to the shaft. In addition, the mechanical strength of such suppressing means is improved, the structure is simplified, the number of parts is reduced, the manufacturing cost is reduced, and it becomes extremely practical. .

[Brief explanation of the drawing]

Figure 1 is a partially cutaway front side view of a tail-cab truck based on this invention with the cab placed in the riding position, and Figure 2 is similar to Figure 1. 1 is a partial front side view showing the cab of the illustrated truck in a tilted position; FIG. 10...Tailed cab type truck, 11...
...shaft, 12...cab, 13...cab front suspension, 14...hydraulic operating cylinder, 15...connection part, 16...elongated hole, 1
7... Connection pin, 18... Stopper bar, 19
...Stopper groove, 20...Protrusion.

Claims (1)

[Claims for Utility Model Registration] A chassis rotatably connected to the chassis via a tail shaft at the front of the chassis so as to be rotated between the riding position and the tilted position;
and a cab elastically supported on the chassis, a cylinder, a piston fitted into the cylinder so as to be able to reciprocate and slide, one end of which can be inserted into and taken out of the outside of one end of the cylinder, and the other end of which is reciprocally slidable. comprises an operating rod fixed to the piston, a hydraulic operating cylinder having the other end of the cylinder rotatably connected to the shaft at the rear of the tail shaft, and one end of the operating rod of the operating cylinder. A connecting portion arranged, a long hole formed in either the connecting portion or the cab, a connecting pin passed through the long hole and fixed to the other of the connecting portion or the cab; a stopper bar having approximately the same length as the operating rod, having one end provided with a stopper groove and pressed against the outer surface side of the cylinder, and the other end rotatably attached to the cab side; disposed on one end of the cylinder, the cab being raised about the tail shaft from a riding position to a leaning position relative to the chassis;
A tail cab type automobile including a protrusion that is hooked into a stopper groove of the stopper bar when the tilt angle of the cab reaches a predetermined angle.