JPH0353886B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an agricultural working machine that is directly mounted on a tractor;
For example, the power intake shaft of a sprayer and the tractor
Concerning improvements to power coupling devices that connect PTO shafts.

[Prior art] When a work machine is mounted directly on a tractor, it is necessary to move its center of gravity as close to the tractor as possible to prevent the front wheels of the tractor from floating. Because it is located below the PTO shaft, connecting the PTO shaft and the power intake shaft has become a dangerous and difficult task. Especially for sprayers, the PTO shaft and power intake shaft are universal
The worker dives under the sprayer, which is connected via a joint and lifted by a three-point link on the tractor, and attaches and detaches the splines at both ends of the universal joint to the spline shafts of the tractor and sprayer, and installs the PTO shaft and power intake shaft. The connection work was extremely dangerous as it involved removal.

[Problems to be Solved by the Invention] The present invention provides a one-touch joint type coupling device that can safely and easily attach and detach the PTO shaft of a tractor and the power intake shaft of a working machine without going under the working machine. This is an attempt to solve the above problem.

[Features of the Invention] The device of the present invention for solving the above problem includes a first universal joint whose one yoke is attachable to the PTO shaft of the tractor, and a second universal joint fixed to the other yoke of the first universal joint. one connecting shaft, one coupling shaft provided at the tip of the first coupling shaft, and a second coupling shaft having the other coupling shaft at one end;
One yoke is fixed to the other end of the second connecting shaft, and the other yoke is held by a second universal joint that can be attached to the power intake shaft of the work equipment, and a three-point link of the tractor to rotate the first connecting shaft. The first hanging metal fitting is movable and can be hung up and down so as to be able to pivot up and down around the first universal joint, and the second hanging bracket is held by the working machine and can be freely rotated around the second connecting shaft and can be pivoted up and down around the second universal joint. It consists of a second hanging bracket that is hung from the

The coupling ring is formed of a conical protrusion with a diametrically projecting pin and a conical recess with a diametrical pin groove into which the pin fits. The second connecting shaft is formed to be expandable and contractible, and one and the other of the couplings are pressed against each other via an elastic body. The first and second hanging fittings include a link and a ring rotatably supported by the link, and the ring is attached to the first and second connecting shafts via bearings.

[Example] The apparatus of the present invention will be described based on an example shown in the drawings. As shown in FIG. 1, one yoke of the first universal joint 10 of the tractor side joint 61 is formed so as to be attachable to the tractor PTO shaft, and the first connecting shaft 12 is fixed to the other yoke. The connecting shaft 12 is connected to the first hanging fitting 15 via the bearing 13.
The ring 14 is fitted into the ring 14 of the link 1.
6, it is pivoted so that it can pivot up and down. A male coupler 17 is fixed to the tip of the first connecting shaft, and the male coupler is formed of a conical protrusion 18 and a pin 19 projecting diametrically from the cone protrusion.

Second connecting shaft 2 of joint 62 on sprayer side
A female cup ring 21 is fixed to one end of the 0, and the female cup ring has a conical recess 21 and a pin groove 23.
formed from. The second connecting shaft 20 has an expandable structure in which an inner shaft 25 is inserted into an outer shaft 24, and a compression coil spring 26 is installed inside. A long hole 27 in the axial direction is formed in the outer shaft 24, and a stopper 28 implanted in the inner shaft 25 projects from the long hole. The compression coil spring 26 advances the inner shaft 25 until the stopper 28 hits one end of the elongated hole 27. Conversely, the inner shaft 25 can be moved back and forth against the compression coil spring 26 until the stopper 28 hits the other end of the elongated hole 27. That is, the entire length of the second connecting shaft 20 expands and contracts by the length of the elongated hole 27. Outer shaft 24 and inner shaft 2
It is desirable that the cross section of 5 be formed into a lemon shape or a square shape and rotated together. The other end of the second connecting shaft 20 is fixed to one yoke of the second universal joint 30, and the other yoke of the second universal joint 30 is attached to the power intake shaft of the working machine. An inner ring of a ring 34 of a second hanging fitting 35 is fitted onto the outer shaft 24 via a bearing 33 so as to be rotatable relative to the outer ring.

As shown in FIGS. 2 and 3, the protrusion 18 of the male coupling 17 has a truncated conical shape, and a pin 19 is passed through a diametrical through hole. The pin 19 is fixed by a bolt 32 screwed into the head of the convex portion 18.

As shown in FIGS. 4 and 5, the female coupling ring 21 consists of a conical recess 22 and two diametrical pin grooves 23 carved into its base, and the pin grooves are symmetrical about the axis. be. As shown in FIG. 5, the shape of the pin groove 23 is a V-shape notched in the direction of rotation of the tractor PTO shaft, but the lower end is a biting circle, and its diameter is the same as that of the pin shown in FIGS. 3 and 4. They have the same diameter.

As shown in FIG. 6, when the male coupling ring 17 and the female coupling ring 21 are combined, the conical protrusion 1
8 enters the conical recess 22, and the pin 19 enters the pin groove 2.
It fits into the circular bottom of number 3.

Next, the connection operation using the device of the present invention will be described in Figure 7.
This will be explained based on FIGS. 9 to 9. The seventh sprayer 40 includes a main frame 41 and an auxiliary frame 42 that overlap each other, and a tank is attached to the main frame.
The auxiliary frame 42 is attached to three-point links, that is, an upper link 51 and a lower link 52 of a tractor 50 (only the rear wheels are shown). A hook 43 and a hook receiver 4 are connected to the upper ends of the main frame 41 and the auxiliary frame 42.
4 is provided. A sprayer drive device 45 is attached to the main frame 41, and the second universal joint 30 of the sprayer side joint 62 is attached to the power intake shaft 46. The second hanging fitting 35 that supports the second connecting shaft 20 is supported by a link 36 provided on the main frame 41 so as to be freely movable or rotatable up and down. The first universal joint 10 of the tractor-side joint 61 is attached to the tractor PTO shaft 53, and the first connecting shaft 10 is supported by the auxiliary frame 42 by the first hanging fitting 15, so the position of the tractor-side joint 61 is relative to the auxiliary frame 42. , that is, the positions of the three-point links 51 and 52. The operator rides on the tractor 50, moves the tractor 50 backwards, operates the three-point links 51 and 52, and locks the hook 4 of the main frame 41 as shown by the arrow.
3 is hung with the hook receiver 44 of the auxiliary frame 42.

Further, as shown by the arrow in FIG. 8, when the operator lifts up the upper link 51 while riding on the tractor 50, the auxiliary frame 42 rises together with the upper link 51 and overlaps the main frame 41. At this time, the convex part of the male coupler 17 at the tip of the tractor-side joint 61 draws a locus shown by a dashed line, but the second hanging fitting 35 is moved so that the concave part of the female coupler 21 of the sprayer-side joint 61 intersects with this locus. Since it is pre-adjusted, the male cup spring 1
The conical convex portion 7 enters the conical concave portion of the female coupling ring 21. Since both are in the relationship of a conical convex portion and a conical concave portion, they are automatically centripeted and easily combined.
However, the pin 19 of the male coupling ring does not necessarily fit into the pin groove 23 of the female coupling ring immediately.

Next, as shown in FIG. 9, when the tractor PTO shaft 53 is turned and the pin 19 of the male coupling ring is once fitted into the pin groove 23 of the female coupling ring 21, the female coupling ring 21 is pressed against the male coupling ring 17 by the compression coil spring, and Since the pin groove 23 is cut in the direction of rotation of the tractor PTO shaft, the pin 19 automatically comes into close contact with the bottom of the pin groove 23. As a result, the tractor side and sprayer side joints 61, 6 between the first and second universal joints 10, 30
2 are connected in a straight line. All of this connection work can be done by one worker while riding the tractor, so there is no danger to the work, and the tractor PTO shaft and the sprayer's power intake shaft can be easily connected with one-touch operation. Moreover, since the auxiliary frame and the main frame overlap at the same time as the tractor PTO shaft and the sprayer's power intake shaft are connected, the mounting of the work equipment on the tractor is completed. Although not shown, detachment of the sprayer from the tractor and removal of the tractor PTO shaft and sprayer power intake shaft are also possible.
Since the operator remains on the tractor and simultaneously reverses the PTO shaft and lowers the three-point link, the disengagement process is easy and completely non-hazardous.

[Effects of the Invention] As described above, in the device of the present invention, when a worker on a tractor lifts the three-point link while moving the tractor backwards with respect to the work machine, and then rotates the PTO shaft, the cone of the joint on the tractor side The convex part centripetally engages with the conical concave part on the working machine side, and the pin protruding from the conical convex part fits into the pin groove of the conical concave part, so the connection work is an extremely simple one-touch operation. . Unlike conventional coupling devices, there is no need for the operator to crawl under the work equipment, so there is no risk of danger in the work.

In particular, when the device of the present invention is installed on a sprayer that has a main frame and an auxiliary frame and is mounted on a tractor with a single touch, the sprayer can be mounted and removed from the tractor and the tractor PTO shaft and the sprayer power intake shaft can be connected and separated at the same time. This provides superior effects that cannot be obtained with conventional equipment.

[Brief explanation of drawings]

FIG. 1 is a front view showing a part of a device according to an embodiment of the present invention in cross section; FIGS. 2 and 3 are end views and longitudinal sectional views showing one conical convex portion of a coupling;
4 and 5 are end views and longitudinal cross-sectional views showing the other conical recess of the coupling, FIG. 6 is a partially sectional front view of the coupling when coupled, and FIGS. 7 to 9 are main views. FIG. 7 is a front view showing the connection between a sprayer and a tractor equipped with the connection device of the invention;
The figure shows the state before connection, FIG. 8 shows the state immediately before connection, and FIG. 9 shows the state after connection. In the figure, reference numeral 10 is a first universal joint, 12 is a first connecting shaft, 15 is a first hanging metal fitting, 17 is a male coupling, 18 is a conical convex portion, 19 is a pin, and 20
is a second connecting shaft, 21 is a female coupling, 22 is a conical recess, 23 is a pin groove, 30 is a second universal joint,
35 is a second hanging metal fitting, 40 is a sprayer, 41 is a main frame, 42 is an auxiliary frame, 43 is a hook, 44 is a hook receiver, 46 is a power intake shaft, 50 is a tractor,
51 is the top link, 52 is the top link, 53 is the top link.
The PTO axis is shown respectively.

Claims (1)

[Scope of Claims] 1. A first universal joint with one yoke attached to the tractor PTO shaft, a first connecting shaft fixed to the other yoke of the first universal joint, and a tip end of the first connecting shaft. One of the coupling shafts is provided at one end, the other of the coupling is provided at one end, and one yoke is fixed to the other end of the second coupling shaft, and the other yoke is connected to the power intake shaft of the work machine. a second universal joint attached to the second universal joint; a first hanging metal fitting that is supported by a three-point link of the tractor and hangs the first connecting shaft so as to be rotatable and pivotable about the first universal joint; a second hanging fitting that is held by a work machine and hangs the second connecting shaft rotatably and pivotably around the second universal joint, and the coupling ring includes a pin protruding in a radial direction. and a conical recess having a pin groove into which the pin fits, and one of the first and second connecting shafts is formed to be expandable and contractible and is elastically compressed in the direction of expansion. A power coupling device for directly mounted work equipment. 2 The pin provided in the conical convex portion protrudes in the diametrical direction, and the pin groove provided in the conical concave portion is provided in the diametrical direction and V in the rotational direction of the tractor PTO shaft.
The power coupling device for a directly mounted working machine according to claim 1, characterized in that the cutout is in the shape of a letter. 3 A first universal joint with one yoke attached to the tractor PTO shaft, a first connecting shaft fixed to the other yoke of the first universal joint, and a coupling provided at the tip of the first connecting shaft. one yoke is fixed to the other end of the second coupling shaft, and the other yoke is attached to the power intake shaft of the working machine. a universal joint; a first hanging fitting that is supported by a three-point link of a tractor and hangs the first connecting shaft so as to be rotatable and pivotable about the first universal joint; a second hanging fitting that hangs the second connecting shaft rotatably and pivotably around the second universal joint; a conical recess with a pin groove into which the pin fits; one of the first and second connecting shafts is formed to be expandable and compressible in the direction of expansion; A main frame and an auxiliary frame are provided with respective supports, the main frame and the auxiliary frame are formed so as to be superimposed via the hook and the hook receiver, and the auxiliary frame is attached to a three-point link of a tractor, The power coupling device for a directly mounted work machine, wherein the first hanging metal fitting is held by the auxiliary frame, and the second hanging metal fitting is held by the main frame. 4 The pin provided in the conical convex portion protrudes in the diametrical direction, and the pin groove provided in the conical concave portion is provided in the diametrical direction and V in the rotational direction of the tractor PTO shaft.
4. The power coupling device for a directly mounted working machine according to claim 3, wherein the power coupling device is cut into a letter shape.