JPH0159843B2 - - 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.

In the coupling device according to the present invention, U-shaped clamping tools that fit with the mounting member of the work machine are arranged side by side with an interval larger than the width of the gear case, and when connecting, the U-shaped clamping tools are arranged side by side with a distance larger than the width of the gear case, and when connecting, A contact member is provided that contacts the seat of the work equipment at a position that is far away, and the left and right mounting members are respectively fitted into the recesses of both gripping tools so as to sandwich the gear case, and the contact member is placed in contact with the seat of the work equipment. let it come into contact with the
The present invention is characterized in that it includes attachment means for attaching to a working machine by closing the open ends of the clamps with pins, and connection means for connecting the coupling device itself to a tractor. 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 projecting 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 through 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. This fitting protrusion 22 functions as a seat on the working machine side, and the grooved frame 2 functions as an abutting member that abuts on this seat.

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 groove 2a of the grooved frame 2 and the fitting protrusion 22 are fitted to each other. As shown in FIG. 4, a contact plate 25 is provided on the inner surface of the groove 2a. Toban 2
5 is supported by a support pin 28 provided with a spring 27 to ensure a good fit between the fitting protrusion 22 and the groove 2a. The grooved frame 2 is also provided with a lock bolt 29 that presses the abutment plate 25, and by tightening this with the fitting protrusion 22 fitted, a tight fitting condition can be obtained. ing. These plate 25, lock bolt 29
etc. are not necessarily necessary, but it is practically advantageous if they are provided. The open end of the clamping tool 5 connects the stopper 23 having the through hole 23a to the pipe-shaped base frame 15,
15' 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, so that the connecting device and the working machine cannot be separated from each other. This may be done using only the closing pin 24 at the open end of the clamp 5, but as shown in the illustration, a stopper provided with a concave curved surface 23b that makes good contact with the outer peripheral surface of the pipe-shaped base frame 15, 15' may be used. It is preferable to intervene because the fixing state becomes better. Note that the pin 24 in the illustrated example has a clamping tool 5.
A locking piece 24a that is locked is provided, and a locking hole 24b for inserting the locking pin 26 is always directed upward.

In this way, the coupling device A is attached to the rotary tiller B, but in this state, the contact portion between the grooved frame 2, which is the contact member, and the fitting protrusion 22, which is the seat, is A line (second
It is located at a position away from (above) the X-X line in the figure. In this way, since the coupling device and the working machine are in contact with each other at a position away from the fitting portion between the clamping tool 5 and the mounting member, rotation of the working machine with respect to the coupling device is effectively prevented, and the coupled state is maintained. becomes strong. In the illustrated example, a V-shaped groove is provided in the abutment member of the coupling device, and the seat on the work machine side is formed as a protrusion that fits into this groove. A recess into which the protrusion fits may be provided on the seat side. Further, although the contact member and the seat may be brought into contact with each other with their flat surfaces, a better fixed state can be obtained by making contact with each other using a fitting method using a V groove and a V-shaped protrusion as shown in the illustrated example. .

The connecting device connected to the working machine is used by being connected 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 disconnected from the working machine B and rotated upward by the lift of the tractor C. In this state, the lock bolt 29 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. 5 is an enlarged view of the clamp holder 5, which can also be arranged 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 a working machine, and a position distant from a line connecting the clamping tools. and a contact member that comes into contact with the seat of the work machine, and with the clamping tools arranged on both sides of the gear case, fit the mounting member provided on the work machine, and at the same time, bring the abutment member into contact with the seat. Since it is connected to the work machine by touching it and closing the open end of the clamp with a pin, it is possible to connect and disconnect from the work machine with simple operations, and it can be attached to the work machine. In this way, a stable connected state can be obtained. 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, Figs. Figures a and b are enlarged views of the main parts. 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 ... Stopper, 24 ... Pin, 2
5...This board.

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 a U-shaped clamping device that fits into the mounting member of the working machine and is arranged side by side at an interval greater than the width of the gear case, and when connected, the U-shaped clamping tools are arranged side by side at a distance greater than the width of the gear case, and when connected, the U-shaped clamping tools that fit into the mounting member of the work machine are arranged side by side at a distance greater than the width of the gear case. A contact member is provided that contacts the seat of the work equipment at the position where the gear case is held, and the left and right mounting members are respectively inserted into the recesses of both clamping tools so as to sandwich the gear case, and the contact member is brought into contact with the seat of the work equipment. The work is characterized in that it is provided with a mounting means adapted to be attached to a working machine by bringing the clamps into contact with each other and closing the open ends of the clamping tools with pins, and a coupling means coupling the coupling device itself to the tractor. Machine coupling device. 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.