JPH083220Y2 - Working machine coupling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a working machine connecting device for connecting a working machine such as a manual spreader to a three-point link of a towing vehicle such as a tractor.

(Prior art) A conventional towing vehicle and work implement are connected by connecting a towing rod on the work implement side to a hitch provided at the rear of the towing car with bolts, pins, etc., and connecting the PTO shaft of the tractor and a universal joint. It was connected to the driven shaft of the working machine via bolts, nuts, etc.

(Problems to be solved by the invention) As described above, in the conventional connecting device, the towing rod of the working machine is directly connected to the hitch of the tractor or the like, and the connecting point becomes the turning center of the working machine. The center will be located near the rear of the tractor. Therefore, if the turning radius of the tractor or the like is reduced, the tire and the tow rod come into contact with each other, so that the turning radius cannot be reduced, and the operability of the tractor or the like deteriorates.

Further, in the conventional connecting device, connection or disconnection must be performed at two points between the hitch and the tow rod and between the PTO shaft and the driven shaft. This connection or disconnection also adjusts the respective positional relationships, for example, moving the tractor etc. to bring the connection parts close to each other, aligning the bolt holes, adjusting the height of the tow rod by the stand to the height of the hitch, After the connection, it was necessary to lift the stand to a position where it would not get in the way, so the work was complicated.

Therefore, in the present invention, the turning point of the working machine is lowered rearward to widen the area where the tires of the tractor and the like do not come into contact with the tow rod of the working machine so that the tractor can make a small turn and the operator can ride on the tractor. (EN) Provided is a working machine coupling device capable of associating or disconnecting a tractor or the like with a towing rod and a driven shaft of a working machine while keeping the vertical movement of a three-point link.

(Means for Solving the Problems) In order to achieve the above object, the present invention is driven by a PTO shaft of the towing vehicle on a frame that is projected from the rear part of the towing vehicle and is supported by a vertically movable three-point link. A first coupling member mounted so as to stand upright by its own weight together with a frame body into which the dog clutch is inserted, and a driven shaft fixed to the working machine. The downward coupling of the dog clutch connected to the output shaft via the gear means is composed of a second connecting member attached to a hitch connected to the tow rod fixed to the working machine via a coupler for inserting the dog clutch. At the lower edge of the coupler into which the downward dog clutch is inserted, a plurality of balls are radially arranged so as to project into the inner hole of the coupler, and the balls are positioned. An operating sleeve is movably fitted to the outer periphery so as to be vertically movable, and the plurality of balls are provided so as to project into the inner hole at a lower position of the operating sleeve, and a fork is pivotally attached to the hitch so as to be movable up and down. A lower outer circumference of a frame body into which the operating sleeve is movably engaged in the same direction, a stand is vertically movably attached to the hitch, and the fork is movably engaged in the same direction, and the upward dog clutch is inserted. In addition, a coupler portion formed in a concave shape for engaging the plurality of balls is provided.

(Operation) The operation of the device of the present invention will be described with reference to the attached drawings and the numbers thereof.

First, the case of connecting the tractor and the working machine will be described.

When the second connecting member 20 or the like attached to the working machine is placed on the ground, the stand 34 first comes to the ground, and then the hitch 31 slides on the stand 34 and descends. Due to this lowering, the tip of the stand 34 pushes up the fork 35, so that the fork 35 pivots clockwise around the pivot point 35a, and the operating sleeve 29 is pulled upward. When the operating sleeve 29 rises, the coupler
The balls 28 in the holes 27 of 26 are movable in the radial direction.

In this state, the tractor or the like is operated to position the first connecting member 8 attached to the three-point link directly below the second connecting member 20 (state of FIG. 1), and the hydraulic pressure equipped with the three-point link is set. When it is lifted by a device or the like, the first connecting member 8 pushes the ball 28 away and enters the coupler 26, and the dog clutches 13,25.
Are engaged, and the ball 28 is positioned around the coupler portion 15 of the first connecting member 8. When the three-point link is further lifted from this state, the first connecting member 8 moves to the second connecting member 20.
And because the member on the working machine side is to be lifted, the stand 34 moves downward with respect to the hitch 31 by its own weight. The fork 35 without support is rotated counterclockwise by its own weight to lower the operating sleeve 29. As the operating sleeve 29 descends, the balls 28 are simultaneously pushed toward the center of the coupler, so that the balls 28 are immovably engaged with the coupler portion 15. This stationary state is maintained while the operating sleeve 29 continues to be lowered.

As described above, the first connecting member 8 and the second connecting member 20
The connection with is completed.

When this connection is completed, the tractor etc. will be connected to the three-point links 4a, 4b.
, The frame 1, the connecting members 8 and 20, the hitch 31, and the towing rod 38 are connected to the working machine to pull the working machine, and at the same time, the PTO shaft, the universal joint 16, Input shaft 9, bevel gears 10 and 11, dog clutch 1
A drive system including 3,25, bevel gears 22,23, the output shaft 21, and the universal joint 39 is formed.

To release the connection, simply lower the three-point link,
When the stand 34 touches the ground, it pushes the fork 35 up, so
The engagement between the ball 28 and the coupler portion 15 is released, and the connection between the first connecting member 8 and the second connecting member 20 can be easily released.

(Embodiment) An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

Reference numeral 1 is an arch-shaped frame, and a pair of lower end portions are curved and extend rearward. Triangular side plates 2 are fixed to the curved portions of the frame 1, respectively, and a lower link 4a of a three-point link attached to a tractor is connected to the front end of the side plate 2 with a pin, and is connected to a connecting plate 3 on the top of the frame 1. The upper link 4b is connected by a pin. The lower link 4a and the upper link 4b are operated by an installed hydraulic device or the like. A reverse arch-shaped leg portion 5 is attached to the lower side of the frame 1 to hold the rear end of the frame 1 at a predetermined height.

A U-shaped frame 6 is attached to the rear end of the arm 1 by a bolt 7 so as to be rotatable around a horizontal axis.

A first connecting member 8 is fixed to the center of the frame 6 of the U-shaped frame 6. The connecting member 8 has an input shaft 9 having an end portion exposed in the front thereof rotatably attached to a frame body 14, and a bevel gear 10 is attached to a rear end of the input shaft 9 to form a bevel gear.
A shaft 12 having a bevel gear 11 that meshes with 10 is rotatably mounted facing upward, and a dog clutch 13 located outside the frame 14 is mounted on the upper end of the shaft 12.

The outer peripheral surface of the frame body 14 is a coupler portion with which a coupler described later is engaged.
Equipped with 15.

A universal joint 16 connected to the PTO shaft is connected to the exposed portion of the input shaft 9 to transmit the output of the PTO shaft to the input shaft 9.

When the three-point link is raised, the first coupling member 8 is raised with the dog clutch 13 facing upward, while maintaining the vertical state.

 The second connecting member 20 is attached to the working machine side.

The second connecting member 20 has an output shaft 21 having an end exposed at the rear thereof rotatably attached to the frame body 41, and a bevel gear 22 attached to the front end of the output shaft 21. gear
A shaft 24 having a bevel gear 23 meshing with 22 is mounted facing downward, and a dog clutch 25 located outside the frame 41 is mounted on the lower end of the shaft 24.

A tubular coupler 26 is attached to the connecting member 20 so as to surround the dog clutch 25.

As shown in FIGS. 3A and 3B, a plurality of holes 27 are formed along the lower edge of the coupler 26 so as to radially pass through the wall of the coupler 26, and the balls 28 are radially arranged in the holes 27. It is movably fitted. An operating sleeve 29 having an annular band shape is vertically movably fitted around the outer periphery of the coupler 26 where the ball 28 is located. Further, a groove is provided on the inner wall of the coupler 26 between the lower edge and the dog clutch 25, and a plurality of balls 30 are filled in the groove to slightly expose the inner wall side.

In addition, a bent hook-shaped hitch 31 is fixedly provided on the connecting member 20, and as shown in FIG.
A guide tube 32 located in the up-down direction is fixed. Guide tube
A stand 34 is vertically slidably inserted into 32, and the head of the stand 34 is positioned in contact with the lower surface of a fork 35 whose base end is pivotally attached to the hitch 31.

In addition, the stand 34 is slidably inserted into the hitch 31, a long groove is provided on the side portion of the hitch 31, a mounting bar is projected to the outside through the long groove on the stand 34, and this bar is forked.
You may make it contact | abut on the lower surface of 35.

The fork 35 has a U-shaped portion when viewed from above, the operating sleeve 28 is positioned between the U-shaped portions, and the both are rotatably connected by a bolt 36. A spring 40 is attached between the fork 35 and the hitch 31, and the fork 35
Always urge downward.

In addition, a connecting fitting 37 is attached to the hitch 31,
A tow rod 38 is connected to the connecting fitting 37. The output shaft 21 of the second connecting member 20 is connected to an anniversary joint 39 for driving a driven part of the working machine.

(Effect) Since the present invention is configured as described above, the frame protruding from the rear portion of the towing vehicle rotates the upward dog clutch of the first connecting member upward, and therefore the radius (frame length) is A larger size is better, and the turning point of the working machine will inevitably move away from the rear part of the towing vehicle.If the tires of the tractor etc. are not positioned extremely rearward, the tires will not contact the towing rod of the working machine and will turn. This makes it easier to turn around and improves operability and workability.

Since the frame can be raised and lowered from the driver's cab of the towing vehicle, etc., the tractor and the towing rod of the work machine can be connected to the driven shaft while the operator is still on the tractor and only by the vertical movement of the three-point link. The work efficiency can be improved because the linkage or disconnection can be performed quickly at the same time.

[Brief description of drawings]

1 is a partially cutaway side view of the device of the present invention, FIG. 2 is a plan view thereof, and FIGS. 3a and 3b are enlarged operational views of the lower edge of the coupler. 1 to frame, 8 to 1st connecting member, 15 to coupler part, 20
-Second connecting member, 26-coupler, 28-ball, 29-actuating sleeve, 31-hitch, 34-stand, 35-fork.

Claims (1)

[Scope of utility model registration request] 1. An upward dog clutch connected to a frame, which is projected from a rear portion of a towing vehicle and supported by a vertically movable three-point link, via an input shaft driven by a PTO shaft of the towing vehicle via gear means. A first coupling member mounted so as to stand upright by its own weight together with a frame body into which the dog clutch is inserted; a downward dog clutch coupled via an output shaft for driving a driven shaft fixed to the working machine and gear means. A second connecting member attached to a hitch connected to the tow rod fixed to the working machine via a coupler for inserting the dog clutch, and a lower edge of the coupler for inserting the downward dog clutch,
A plurality of balls are radially arranged so as to be projectable in the inner hole of the coupler, and an operating sleeve is loosely fitted to the outer periphery where the balls are located so as to be vertically movable, and the plurality of balls are located below the operating sleeve. Is provided so as to project into the inner hole, the fork is pivotally attached to the hitch so as to be vertically movable, and the operating sleeve is movably engaged in the same direction, and the stand is attached to the hitch so as to be vertically movable, and A working machine characterized in that a fork is movably engaged in the same direction, and a coupler portion formed in a concave shape for engaging the plurality of balls is provided on a lower outer periphery of a frame body into which the upward dog clutch is inserted. Connecting device.