JPS6147747B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement in a tail-cab type motor vehicle.

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 and used, 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. .

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 gear is connected to the cab by fitting the rod so that it can slide back and forth, it is difficult to ensure smooth free movement of the cab relative to the shaft.
Moreover, for sufficient mechanical strength, the trunnion must be thick or made of expensive material, and the latter is structurally more complex and difficult to manufacture than the mechanical former. It required advanced technology and became expensive.

The purpose of this invention is to
When in the riding position, that is, when in the running position, the cab facilitates free movement, and
The cab is raised from the riding position to the tilted position around the tail shaft relative to the seat, and the center of gravity of the cab is
A cab tailing means is coupled between the chassis and the cab, in particular capable of reliably suppressing the tilting movement of the cab relative to the chassis when the cab is tipped forward beyond the shaft. One end of the cab tailing means is connected to one side of the cab, and the means for allowing and smoothing the free movement of the cab and suppressing the tilting movement of the cab is provided without increasing the size of the machine. The tailt/tail mechanism improves mechanical strength, simplifies the structure, reduces the number of parts, reduces manufacturing costs, and also facilitates maintenance and inspection, and easily transmits the force of the cab/tail means to the cab. The purpose is to provide cab-type automobiles.

For those problems, the invention's tailt
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 so as to be able to reciprocate, and one end of the cylinder being removable from the outside of one end of the cylinder and the other end being fixed to the piston. It consists of an operating rod, and its tail and
a hydraulic operating cylinder having either the other end of the cylinder or one end of an operating rod rotatably connected to the shaft at the rear of the shaft;
A pair of rollers disposed at a predetermined distance in the axial direction of the operating cylinder at the other end of the operating cylinder and one end of the operating rod; and opened in a plane perpendicular to the tail shaft,
Furthermore, the bent portion is located on the tail shaft side and includes an inverted substantially L-shaped cam groove in which the pair of rollers is fitted.

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

1-5 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 23 in front of the chassis 11 so as to be rotated between the riding position and the reclined position. and a cab 12 connected to the front of the cab 12 and the front of the chassis 11.
The left and right cab front suspensions 13 elastically supported the cab 12 on the chassis 11, and the rear of the cab 12 was connected to the chassis 11, and the cab 12 was elastically supported on the chassis 11. A cab rear mount (not shown) and a cab 11 and a cab 12 are mounted behind the cab front suspension 13 to rotate the cab 12 between a riding position and a reclined position. A hydraulic operation cylinder 14 disposed between the two rollers 1 and a pair of rollers 1 disposed at one end of the operation rod 31 of the operation cylinder 14 at a predetermined interval in the axial direction of the operation cylinder 14.
5, 16 and behind its tail shaft 23, i.e. behind its cab front suspension 13, its cab 1
2 and into which the rollers 15 and 16 are fitted, and a cam groove 17 located at the rear of the cab 12 and the rear of the cab in order to fix the cab 12 on the chassis 11 in the riding position of the cab 12.
The device includes a cab lock device (not shown) disposed between the device and the mount.

The Cab Front Suspension 13
is in front of the truck 10 and on the left and right sides,
They are arranged between the chassis 11 and the cab 12, and each includes a lower bracket 20 bolted to the chassis 11, an upper bracket 21 bolted to the lower surface of the cab 12 in front of the cab 12, and an upper bracket 21 bolted to the lower surface of the cab 12 in front of the cab 12. a longitudinal link 22 extending longitudinally of the truck 10, i.e. its chassis 11, and disposed between its upper and lower brackets 21, 20;
a tail shaft 23 rotatably connecting the forward end of the longitudinal link 22 to the lower bracket 20; a connecting shaft 24 rotatably connecting the rear end of the longitudinal link 22 to the upper bracket 21; and a spring for the upper bracket 21. a coil spring 25 arranged between the seat 27 and the spring seat 28 of its longitudinal link 22 and rotatably connected at one end to the tail shaft 23 and at the other end to a pin 29 of the upper bracket 21; The shock absorber 26 is made up of a shock absorber 26.

The fluid pressure type operation cylinder 14 is a hydraulic cylinder, and includes a cylinder 30, a piston (not shown) fitted in the cylinder 30 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 30. , the other end of which includes an operating rod 31 fixed to the piston;
The cylinder 30 is connected via pipes 32 and 33 to a hydraulic unit (not shown) including a hydraulic power source, a control valve, and the like.

The cylinder 30 is spaced a suitable distance behind the tail shaft 23 and has its other end rotatably connected to the shaft 11 via a piston.

Further, the operating rod 31 has a roller holder 34 fixed to one end thereof.

The roller holder 34, as shown in FIG. ing.

The roller holder 34 rotatably supports cab-side rollers 15, 15 and chassis-side rollers 16, 16 at a predetermined distance in the axial direction of the operating rod 31 via pins 36, 37. .

Those cab side and chassis side rollers 15,1
As can be seen from FIG.
The cam grooves 17 are fitted into a pair of cam grooves 17 arranged in the cam grooves 17.

The cam groove 17 is aligned with a predetermined interval in the lateral direction of the track 10, that is, the interval between the rollers 15, 15 and 16, 16, and is connected to a pair of hanging plate portions integrally formed on the upper bracket 21. Each piece is stamped.

The cam groove 17 includes a cab floating groove portion 38 located in the height direction of the truck 10 and a cab locking groove portion located in the longitudinal direction of the truck 10 when the cab 12 is in the riding position. It is configured in an inverted L-shape consisting of 39.

The cab floating groove portion 38 and the cab locking groove portion 39 are connected to each other as shown in FIGS.
When the cab is tilted, the cab side rollers 15, 15 can be smoothly moved from the cab floating groove portion 38 to the cab locking groove portion 39. Further, when the cab 12 is in the riding position, the cab floating groove portion 38 is
As shown in FIGS. 4 and 5, the cab side rollers 15, 15 and 16, 16 are guided in the vertical direction, and the cab 1
2 floating is allowed.

If the roller holder 34 is configured in a U-shape, the number of the cab-side and chassis-side rollers 15, 15 and 16, 16 and the pair of cam grooves 17 configured in this manner may be reduced to one. is also possible, and in this way various modifications can be made.

Next, the cab tilting operation of the truck 10 described above will be explained.

In the truck 10, if the cab 12 is placed in the riding position as shown in FIG. , 15 and 16, 16 are the fourth and fifth
As shown in the figure, since the cab 12 is guided in the vertical direction within the cab floating groove portion 38 of the cam groove 17, the cab 12 is allowed to move relative to the chassis 11.
It is supported elastically above, that is, supported in a floating state. As a result, when the truck 10 is running, vibrations on the chassis side are not directly propagated to the cab side, and a reduction in ride comfort of the cab 12 due to the locking action of the operating cylinder 14 is prevented.

Also, the operating cylinder 14 is driven, the operating rod 31 is pushed out to one end of the cylinder 30, and the cab side rollers 15, 15 push up the cab 12 via the cam groove 17, so that the cab 12 is moved as shown in FIG. As such, it is rotated around the tail shaft 23 and lifted from the riding position to the tilting position.

The cab 12 is moved toward the operating cylinder 1 so that the cab's center of gravity approaches the top of the tail shaft 23.
4 around the tail shaft 23, the cab side rollers 15,
15 moves from the cab floating groove section 38 to the cab locking groove section 39, and when the center of gravity of the cab approaches above the tail shaft 23,
The cab side rollers 15, 15 hit the ends of the cab lock groove portion 39, and in the position shown in FIG. 2, the operating cylinder is stopped and the cab 12 is
The center of gravity of the cab is prevented from tilting forward beyond the tail shaft 23 and is maintained in a tilted position on the chassis 11.

In the above-mentioned tailed cab type truck 10,
The hydraulic operation cylinder 14 is the cylinder 3
0 rotatably connected to the chassis 11,
The cab side rollers 15, 15 and the chassis side rollers 16, 16 are connected to the operating cylinder 14.
Although described as being disposed in the roller holder 34 welded to one end of the operating rod 31 in FIG. , and the cab side and chassis side rollers 15, 15, 16, 16 are arranged in the roller holder 34 by welding the roller holder 34 to the other end of the cylinder 30 in the operating cylinder 14. is also possible.

According to the above invention, the hydraulic operating cylinders for lifting and lifting the cab from the riding position to the tilted position and from the leaning position to the riding position with respect to the chassis are spaced at a predetermined distance in the axial direction of the operating cylinders. A so-called positive cam mechanism is connected between the chassis and the cab by a pair of rollers arranged at The cab is guided smoothly from the tilted position to the tilted position and from the tilted position to the riding position, and when the cab is in the riding position relative to the chassis, that is, in the driving position, the free movement of the cab is smoothed. , and when the cab is lifted from the riding position to the tilted position around the tail shaft relative to the shaft, the center of gravity of the cab passes over the tail shaft, and the cab tips forward; The tilting movement of the cab is reliably suppressed,
Also, the hydraulic operating cylinder, i.e., the cab tail means, is connected between the chassis and the cab, and moreover allows free movement and smooth movement of the cab when the cab is in the riding position. , and when the cab is in the tilted position,
The mechanical strength of the means for suppressing the tilting movement of the cab where the center of gravity of the cab is tilted forward beyond the tail shaft is not increased in size, and the structure is simplified and the number of parts is reduced. As a result, production costs are reduced, maintenance and inspection become easier, and cabs and
The force of the tail means is transmitted to the cab easily and without any trouble.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front side view of a tail-cab type truck embodying the present invention with the cab in the riding position; FIG. 2 is the same as that shown in FIG. FIG. 3 is a cross-sectional view taken along line 3--3 in FIG. 1, and FIGS. 4 and 5 show the truck shown in FIG. , is a diagram showing the relationship between the cam groove and the roller when the cab is in the riding position. 10...Tailed cab type truck, 11...
...shaft, 12...cab, 13...cab front suspension, 14...hydraulic operating cylinder, 15, 16...pair of rollers, 17...
...Cam groove, 20...Lower bracket, 21...Upper bracket, 22...Vertical link, 23...
Tail shaft, 24...Connection shaft, 3
8... Cab floating groove part, 39...
Cab lock groove part.

Claims (1)

[Scope of Claims] 1. A chassis rotatably connected to the chassis via a tail shaft at the front of the chassis so as to be rotated between a riding position and a 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, and the other end of the cylinder and one end of the operating rod are rotatably connected to the shaft at the rear of the tail shaft; a pair of rollers disposed at a predetermined distance in the axial direction of the operating cylinder at either the other end of the operating cylinder and one end of the operating rod; an inverted substantially L-shaped cam groove which is arranged and opened in a plane perpendicular to the tail shaft, with the bent portion located on the tail shaft side, and into which the pair of rollers is fitted; Tail cab type cars including.