JPH0159842B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coupling device for coupling a working machine such as a rotary tiller to a tractor.

If a rotary tiller can be towed by reversing it back and forth while keeping the orientation and rotational direction of its tilling claws constant, it will be possible to till in the normal rotation state (down cut) and in the reverse rotation state (up cut). ) can be selected at will, which is preferable from a practical standpoint as it increases adaptability to field conditions, etc. However, in order to do so, all connecting members had to be removed and replaced in the opposite direction. Therefore, it required a lot of effort.

The present invention includes a transmission gear case with a protruding input shaft connected to a PTO shaft of a tractor like a rotary tiller, and mounting members for connection such as a transmission shaft case on both left and right sides of the gear case. The present invention provides a convenient coupling device that can be used to connect a working machine equipped with a member that can be used as a tractor to a tractor, and this will be explained below.

The coupling device according to the present invention is provided with a coupling means for the tractor, and U-shaped clamping tools that fit with the mounting member of the working machine are arranged in parallel at an interval larger than the width of the gear case, and the gear case is connected to the tractor. The present invention is characterized in that the left and right mounting members are fitted into the recesses of both clamping tools in a pinching manner, and the open ends of the clamping tools are closed with pins to be attached to the working machine. Embodiments of the present invention shown in the drawings will be described below.

FIG. 1 is a side view showing how a rotary tiller B is connected to a tractor using a connecting device A according to the present invention, and FIG. 2 is a rear view of the main parts. This connecting device A has a pair of brackets 1 spaced apart from each other, and both brackets are connected at their upper portions by a grooved frame 2 having a generally V-shaped groove 2a. The bracket 1 is provided with a U-shaped clamping tool 5 that opens downward, and pin holes 5a are bored on both sides of the opening of the clamping tool. A protruding piece 2b is fixed to the upper surface of the grooved frame 2, and a mast 3 is attached to this. A column 4 whose lower end is attached to the bracket 1 is pinned to the mast 3. Further, a support member 3a is provided protruding from the lower part of the mast 3, and a jack 6 is attached to this support member 3a. A rearwardly protruding support frame 7 is pivotally attached to the rear of the bracket 1 by means of attachment pins 8, and a pair of left and right tail wheels 9 are attached to this. The above-mentioned jack 6 is pinned to the middle part of the support frame 7, and this jack 6 supports the tail wheel 9.
The vertical position of can be adjusted. Incidentally, the tail wheel 9 and the support frame 7 are not necessarily necessary for this coupling device.

A rotary tiller, which is a working machine, includes a tilling shaft 11 on which tilling claws 10 are planted, a rotary cover 12 that covers the tilling shaft, a chain case 13 for transmission,
Transmission gear case 14, horizontal pipe-shaped base frames 15, 1 fixed to both left and right sides of the gear case
5′ etc. One pipe-shaped base frame 15
The chain case 13 is attached to the outer end, and one end is connected to the bevel gear device housed in the gear case 14, and the chain case 13 is attached to the other end. A transmission shaft 17 to which an inner upper sprocket wheel 16 is attached is housed. A vertical base member 18 is fixed to the outer end of the other base frame 15', and a bearing 19 for supporting the tilling shaft 11 is provided at the lower end of the vertical base member 18. The rotary cover 12 includes a main cover 12a fixed to the chain case 13 and the vertical base material 18, and a rear cover 12b pivoted to the main cover 12a. The front cover can also be hung down.
The rear cover 12b serves to prevent soil from scattering and to level the field after tilling.
It is connected to the support frame 7 by the support frame 7, and can be rotated upward against the spring 21 when the field becomes too high after tilling.

The gear case 14 is arranged at the upper center of the rotary tiller, and has input shafts 14a and 14b at the front and rear thereof. One of the input shafts 14a and 14b is connected to the PTO shaft of the tractor via a universal joint, and each has a bevel gear that meshes with a bevel gear provided on the transmission shaft 17. Transmission shaft 1 from the tractor's PTO shaft via the input shaft and bevel gear device
The rotational power transmitted to 7 is transmitted to the end of the tilling shaft 11 via the upper sprocket wheel 16, chain 16' and lower sprocket wheel 16'' in the chain case, and rotates the tilling shaft 11. The rotational power may be transmitted to the intermediate portion of the shaft 11.The upper surface of the gear case 14 is provided with a V-shaped groove 2 of the grooved frame 2 provided in the coupling device.
A fitting protrusion 22 having a generally V-shaped cross section is provided to fit into the portion a.

Connecting device A is a rotary tiller B which is a working machine.
Then, with the gear case 14 positioned between the two clamp holders 5, the pipe-shaped base frames 15, 1 are inserted into the recessed part of the clamp holders.
5' respectively, and the fitting projections 22 are fitted into the grooves 2a of the grooved frame 2. The open end of the clamping tool 5 connects the stopper 23 having the through hole 23a to the pipe-shaped base frame 15,1.
5' is closed by inserting the pin 24 passing through the pin hole 5a of the clamping tool 5 and the through hole 23a of the stopper 23, thereby preventing the coupling device and the work machine from separating. . The open end of the clamping tool 5 may be closed using only the pin 24, but as shown in the figure, it is possible to close the open end of the clamping tool 5 with a concave curved surface 23b that makes good contact with the outer peripheral surface of the pipe-shaped base frames 15, 15'. It is preferable to use gold as the fixing state is better. The illustrated pin 24 is provided with a locking piece 24a that locks onto the clamp 5, and a locking hole 24b for inserting the locking pin 26 always faces upward. Although the V-shaped protrusion 22 is not necessarily required, it is advantageous to provide a fitting portion between the protrusion and the V-groove because a more stable connection can be achieved. In the illustrated example, the grooved frame 2 is provided with a locking bolt 25, and the V-shaped protrusion 22 is provided with a locking bolt 25.
Although they are constructed so that they can be tightened in a fitted state, it is advantageous to provide such a locking bolt because the fitted state between the two will be tighter. The coupling device thus coupled to the working machine is coupled to the tractor by an upper link 26 connected to the mast 3 and a lower link 27 connected to the bracket 1.

FIG. 3 shows a state in which the coupling device A is separated from the working machine B and rotated upward by the lift of the tractor C. In this state, the rod bolt 25 is loosened and the pin 24 is attached to the clamping tool 5.
It is pulled out from the pin hole 5a. Connecting device A
It is easy to connect and disconnect between and work machine B. The work machine separated in this way can be turned over or repaired independently. By holding the working machine as it is and turning the tractor to which the coupling device is attached, the working machine can be easily reversed and attached.

FIG. 4 is an enlarged view of the clamp holder 5, which can also be installed horizontally as shown in the figure.

As explained above, the coupling device according to the present invention includes a pair of U-shaped clamping tools provided at an interval larger than the width of the gear case of the working machine,
The clamping tool is placed on both sides of the gear case, and is connected to the work machine by fitting the attachment member provided on the work machine and closing the open end with a pin. Connection and disconnection can be performed with simple operations, and a stable connection state can be obtained when attached to a working machine. It is convenient to use an existing pipe-shaped base frame as the mounting member for the work machine, as shown in the illustrated example, since no special mounting member is required. Note that it is extremely effective if this coupling device is used as a coupling device for reversing a working machine such as a rotary tiller.

[Brief explanation of drawings]

Fig. 1 is a side view showing an example of the coupling device according to the present invention in use, Fig. 2 is a rear view thereof, Fig. 3 is a side view showing the state separated from the working machine, and Figs. 4 a and b. is an enlarged view of the main part. 1... Bracket, 2... Grooved frame, 2a...
Groove, 3... Mast, 5... Holder, 5a... Pin hole, 7... Support frame, 11... Tilling shaft, 14... Gear case, 15, 15'... Pipe-shaped base frame, 22
...Fitting protrusion, 23...Falling metal, 24...Pin.

Claims (1)

[Scope of Claims] 1. A power transmission gear case for connecting a working machine to a tractor, comprising a transmission gear case with a protruding input shaft connected to a PTO shaft of a tractor, and mounting members provided on both sides of the gear case. The coupling device is provided with a coupling means for the tractor, and U-shaped clamping tools that fit with the mounting member of the working machine are arranged in parallel at an interval larger than the width of the gear case,
The left and right mounting members are respectively fitted into the recesses of both clamping tools so as to sandwich the gear case, and the open ends of the clamping tools are closed with pins to be attached to the work machine. Connecting device for work equipment. 2. The connection device for a work machine according to claim 1, wherein the connection device is a connection device for reversing the work machine to which the work machine can be attached by reversing the work machine forward and backward.