JPH0517809B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a riding working machine such as an agricultural tractor, and particularly to a hitch device thereof.

(Prior Art) Various methods have been proposed for connecting a working machine such as a rotary working machine to a riding working machine such as an agricultural tractor.

For example, in the rotary work machine lifting device disclosed in Utility Model Publication No. 43-27603, a power transmission box 2 is provided at the rear of a machine frame 1 of a tractor, a power take-off shaft 3 is housed in the transmission box 2, and a rotary transmission box is placed in the transmission box 2. The front part of the rotary transmission box 6 is connected in a swingable manner, and the tilling claw 1 is attached to the rear part of the rotary transmission box 6.
4, and the rotary transmission box 6 serves as both a mechanical connection and a drive system connection between the machine frame 1 and the tillage shaft 13.

(Problem to be Solved by the Invention) By the way, there is no problem when removing the tilling claw 14 from the tilling shaft 13 and replacing it with another agricultural implement, but if the working machine including the rotary transmission box 6 is There is a problem when it comes to redecorating.

In the rotary work machine lifting device of Utility Model Publication No. 43-27603, the transmission box 2 and the rotary transmission box 6 are assembled integrally, so that it is difficult to disassemble them.

Furthermore, the machine frame 1 and the tilling shaft 13 are attached to the rotary transmission box 6.
The rotary transmission box 6 is not only a simple chain and sprocket case, but also a strong structure that can withstand tension, compression, bending, and torsion. It is necessary to make it a structural member, and the rotary transmission box 6
is large and expensive.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a structure in which a vehicle body and a working machine can be easily separated and connected in a riding working machine.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a power take-off shaft protruding from the front or rear part of the vehicle body in a horizontal direction perpendicular to the traveling direction of the vehicle body, The present invention is characterized in that a hitch for connecting a working machine is attached to the front or rear part of the vehicle body so as to be movable up and down with the take-out shaft as the center of swing, and a fastener such as a pin is attached to this hitch.

The hitbox that is fixed to the work machine is connected to the hitch, and the two are connected using a fastener to connect the work machine to the vehicle body. The power system is connected by fitting the input shaft of the transmission case.

Further, the working machine is separated from the vehicle body by releasing the fastener, and the power system is separated by removing the input shaft of the transmission case from the power take-off shaft.

(Embodiment) A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

FIG. 1 shows a cutaway side view of a riding working machine 1, in which an engine 2 with a vertical crankshaft 3 is mounted at the front of the vehicle body, a transmission case 10 is arranged at the rear of the vehicle body, and a transmission input shaft 11 and a transmission case 10 are installed at the rear of the vehicle body. The work vehicle is connected to a crankshaft 3 by a propulsion shaft 4, has a passenger seat 5 placed on the rear part of the vehicle body, and has front wheels 6, 6 and rear wheels 7, 7 of the same diameter. Front and rear wheel steering can be performed by operation, and four-wheel drive is possible.

That is, the transmission output shaft 12 and the differential input shaft 17 of the differential case 16 disposed below the engine 2 at the front of the vehicle body are connected by the propulsion shaft 18.

A power take-off shaft 13 is disposed horizontally in the width direction at the rear of the transmission case 10.
The right end portion 14 of the case 10 protrudes from the case 10.

On the other hand, a gear case 20 is arranged in front of the differential case 16 at the front of the vehicle body, and its input shaft 21 and crankshaft 3 are interlocked and connected by a belt pulley mechanism 19, and power is taken out horizontally in the width direction at the front of the gear case 20. A shaft 23 is disposed parallel to the power take-off shaft 13, and a left end portion 24 of the power take-off shaft 23 protrudes from the case 20.

The structures of the hitch devices installed at the front and rear of the vehicle body are the same as shown in FIG. A hitch frame 33 is placed on the outer periphery of the provided cylindrical holders 31 and 32.
The left and right pieces 34, 34 of are rotatably supported.

As shown in the figure, the hitch frame 33 is made up of a rear piece 35 that connects the rear ends of left and right pieces 34, 34 extending toward the rear of the vehicle body, and a hitch 37 that is U-shaped in side view as shown in FIG. Fix and prepare.

Furthermore, a cylinder unit case 40 is disposed above the transmission case 10, and one end of a drive shaft 42 that is rotationally driven by a hydraulic cylinder unit 41 housed in the case 40 protrudes from the case 40, and a lift arm is attached to one end of the drive shaft 42. 43 are fixed and integrated, a lift rod 44 is pivotally connected to the rear end of the lift arm 43, and the lower end of the lift rod 44 is pivotally connected to the center of a cross member 36 installed between the left and right pieces 34 of the hit frame 33.

In addition, the front hitch device has a hitch frame 53 mounted on the outer periphery of cylindrical holders 51 and 52 provided on the left and right sides of the front part of the gear case 20 so as to be coaxial with the power take-off shaft 23.
The left and right pieces 54, 54 of are rotatably supported.

The hitch frame 53 consists of left and right pieces 54 extending toward the front of the vehicle body, and a front piece 55 connecting the front ends of the left and right pieces 54 , 54 .
A hitch 57 having a U-shape in side view is fixedly provided on the front piece 55 surface.

Further, a similar cylinder unit case 60 is disposed above the gear case 20, and one end of a drive shaft 62 driven by a hydraulic cylinder unit 61 housed in the case 60 protrudes from the case 60, and a lift arm 63 is attached to one end of the drive shaft 62. A lift rod 64 is pivotally connected to the front end of the lift arm 63, and the lower end of the lift rod 64 is pivotally connected to the center of a cross member 56 installed between the left and right pieces 54 of the hitch frame 53.

In this way, the front and rear hydraulic cylinder units 41, 6
1, each lift arm 43, 6
3. The front and rear hitch frames 33, 53 connect to each power take-off shaft 13, 23 via lift rods 44, 64.
Each swings up and down around its axis.
Incidentally, the drive system of such a lift device may be constructed as a mechanical type.

Next, the working machine equipped on the above working vehicle 1 will be explained.

In this embodiment, the working machine is a rotary operating machine 70 as shown in FIG. 74 and a bracket 75 are extended, and a rolling wheel 77 is provided hanging down from the end of the bracket 75 via an arm 76.

The transmission device from the front and rear power take-off shafts 13, 23 to the rotary shaft 72 is as shown in FIG. A chain 85 is attached to sprockets 82 and 84 respectively attached to the input shaft 9, and an input shaft 9 is rotatably provided within one end of a second transmission case 90 within one collar 83.
The protruding end portion 92 of 1 is spline-fitted. This second transmission case 90 is integrally assembled to the first transmission case 80 at a predetermined angle by fastening a nut 89 to a bolt 88 protruding from the side wall of the first transmission case 80, and the nut 89 can be removed. It is now possible to disassemble it.

A reduction gear train 96 is constructed from the input shaft 91 in the second transmission case 90 to the intermediate shaft 93 and the sprocket shaft 94. A shifter 97 disposed near the input shaft 91 selects a reduction ratio, and
5, and a chain 99 is hung on a sprocket 98 on a rotary shaft 72 supported in a center drive manner at the other end of the second transmission case 90.

When such a work machine 70 is installed in the work vehicle 1, the input shaft 81 of the first transmission case 80 is spline-fitted onto the ends 14, 24 of the front and rear power take-off shafts 13, 23, and the end of the hitbox 74 is fitted with a spline. are fitted into the front and rear U-shaped hits 37, 57, and the pins 39, 39 or pin 59, which serve as two left and right fasteners, are inserted.
Connect at 59.

Since the vertically swingable hits 37 and 57 are provided at the front and rear of the vehicle body, it is possible to install the work implement 70 at the front and rear of the vehicle body, and in particular, when the work implement 70 attached to the rear side is removed, It has the advantage that it can be mounted on the front side as is, and one working machine 70 can be mounted interchangeably in the front and rear.

Since the work implement 70 can be attached to the front part of the vehicle body, the occupant can monitor the working condition while facing forward, and therefore work that requires precision can be performed satisfactorily.

Furthermore, a lift device 4 is installed on the front and rear hits 37 and 57.
1, 43, 44, 61, 63, and 64 are connected, so when attaching and detaching the work machine 70, there is no need to connect and detach the lift device and the work machine side as in the past, and therefore, the attachment and detachment work is simplified. becomes very simple.

In addition, the U-shaped hits 37, 57 are connected to each power output shaft 1.
Since the shafts 3 and 23 are pivotably supported as rotation centers, it is possible to smoothly swing the work implement 70 when raising and lowering it. Furthermore, in the embodiment, the left and right pieces 34, 34, 5 of the front and rear hitch frames 33, 53 are widened by increasing the span on the left and right sides of the rear transmission case 10 or the front gear case 20.
4 and 54 are pivotally mounted, it has sufficient strength as a hitch device.

Although a rotary working machine is used in the embodiment, it is also versatile to use a variety of other working machines such as a cultivator and a lawnmower, and a snow blower can also be attached to the front of the vehicle body.

(Effects of the Invention) As described above, in the present invention, a fastener such as a pin is attached to the hitch, and the input shaft of the transmission case is detachably attached to the power take-off shaft. By removing it from the power take-off shaft, the work equipment can be easily separated from the vehicle body.

Further, since a transmission case for transmitting power and a hitch for mechanically connecting the working machine to the vehicle body are provided, the transmission case may have an extremely simple configuration. As a result, the transmission case can be easily made lighter and smaller.

[Brief explanation of the drawing]

Fig. 1 is a cutaway side view of the riding work machine, Fig. 2 is a cutaway plan view showing the connected state of the work machine together with the lift device, Fig. 3 is an exploded cutaway plan view of the transmission device, and Fig. 4
The figure is a side view of the vehicle body with work equipment attached to the front and rear. In addition, in the drawing, 1 is a riding working machine, 10 is a transmission case, 20 is a gear case, 13, 23 is a power take-off shaft, 33, 53 is a hitch frame, 37, 57
is a U-shaped hitch, 39, 59 are pins as fasteners, 41, 43, 44, 61, 63, 64 are lift devices, 70 is a working machine, 74 is a hitbox,
80 and 90 are transmission cases, and 81 is an input shaft of the transmission case.

Claims (1)

[Claims] 1. A power take-off shaft is provided at the front or rear of the vehicle body, protruding in a horizontal direction perpendicular to the direction of travel of the vehicle body, and the power take-off shaft is pivoted at the front or rear of the vehicle body. , a hitch for connecting the work equipment is attached so as to be movable up and down, a fastener such as a pin is attached to the hitch, a hitch box fixed to the work equipment is brought into contact with the hitch, and the fastener connects the two. The working machine is connected to the vehicle body by coupling the above, and the power system is connected by fitting the input shaft of a transmission case, which is fixed to the working machine separately from the hitbox, to the power take-off shaft. The present invention is characterized in that the work equipment can be separated from the vehicle body by opening the fastener, and the power system can be separated by removing the input shaft of the transmission case from the power take-off shaft. Riding work equipment.