JP2926851B2 - Working hitch of tractor working machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a work hitch for connecting a working device of a tractor working machine.

(Prior Art and Problems to be Developed by the Invention) In a mode in which a tilling device and other working devices are connected to a lifting link including a top link and a lower link provided on the rear side of a tractor body, this work is performed. At the same time as the connection of the devices, it is necessary to perform the transmission connection of the power take-off shaft for transmitting the working device. An output clutch body on the tractor body side,
When it is attempted to set the input clutch body of the working device connected to the lifting link in an interlocked state, it is difficult to align the clutch bodies. Particularly, when the working device is automatically connected, the clutch body is used. Since the connection of the working devices is not performed, the connection of the working devices may not be performed accurately.

(Means for Solving the Problems) The present invention relates to a work integrated with a working machine body 5 on a link hitch 4 attached between a tip end of a top link 2 and a lower link 3 provided to be able to move up and down with respect to a vehicle body 1. An input clutch body 9 that receives the upper part of the hitch 6 and swings the lower part back and forth to be detachably provided and is rotated by a power take-out shaft 7 of the vehicle body 1 to rotate the input shaft 8 of the work machine. And an arm shaft provided on the hitch main body 17 of the link hitch 4
The axis of the output clutch body 10 which turns on and off by the engagement and disengagement of the movement of the output clutch body 10 in the forward and backward rotation circular arc trajectory line B direction attached to the lower part of the arm 29 rotatably suspended with the fulcrum 31 as a fulcrum, A work hitch of a tractor working machine is provided which is supported so as to rotate in the front-rear direction substantially along the axis A of the clutch 11 including the output clutch body 10 and the input clutch body 9.

(Operation and Effect of the Invention) The link hitch 4 can be freely moved up and down by the top link 2 and the lower link 3 at the rear part of the tractor body 1, and while operating the tractor body 1, the entire surface of the work hitch 6 of the work machine body 5 can be controlled. Move it closer to work hitch 6 with this link hitch 4.
When the lower link 3 is lifted by the lift arm on the vehicle body 1 side in response to the upper part of the vehicle, the lower part of the work hitch 6 swings closer to the lower part of the link hitch 4 to be in a connected state. At this time, the output clutch body 10 on the link hitch 4 side and the input clutch body 9 on the work hitch 6 side are substantially opposed to each other and are engaged in an interlocked state. Since these output clutch bodies 10 are supported so as to rotate in the direction of the front and rear rotation circular arc trajectory line B substantially along the axis A of the clutch 11, the input clutch bodies 9 by the work hitch 6 are provided. When the output clutch body 10 approaching is pushed and moved back and forth, the axial center position of the input clutch body 9 does not greatly change.
Therefore, the clutch 11 can be easily connected automatically without manually operating the link hitch 4, so that the work hitch 6 can be quickly connected to the link hitch 4.

(Example) In FIGS. 1 to 3, the tractor vehicle body 1 is of a four-wheel running mode, and a pair of left and right lower links 3 is moved up and down by a lift arm 12 provided at an upper rear portion of the vehicle body 1. The top link 2 is connected to a bracket 14 provided at the rear end of the vehicle body 1 by a lift rod 13 so as to be vertically rotatable. 15 is a rear wheel, and 16 is a rear axle.

The link hitch 4 is located at the upper end of the saddle-shaped hitch main body 17,
A receiving seat 19 for fitting and supporting the suspension pin 18 at the upper end of the work hitch 6 on the upper side is provided.
Are connected by a connecting pin 20. A socket 22 for fitting a pair of left and right connection pins 21 at the lower end of the work hitch 6 is provided on both left and right sides of the lower end of the hitch main body 17. The lower link 3 is moved up and down by the lift arm 12 to move the hitch main body 17 up and down almost in parallel.
A hook 24 is provided in each of the left and right sockets 22 so as to be rotatable around a pin 25, and a connecting pin 21 fitted in the socket 22 is provided.
Are engaged to prevent disengagement. The hook 24 is provided with a lever 26, and the hook 24 is always connected to the pin 21 by a spring 27.
It is resilient to engage with. When the connecting pin 21 is fitted in the socket 22, the hook 24 is pushed open against the spring 27, and the connecting pin 21 is completely fitted in the socket 22, so that the hook 27 is 25 is connecting pin 21
Automatically engage. Reference numeral 28 denotes a connecting member that connects between the left and right lower ends of the hitch main body 17.

The output clutch body 10 is provided at the lower left and right central portions of the hitch main body 17 so as to be swingable in the front-rear direction by left and right integrated arms 29, and the upper end of the arm 29 is provided with respect to the bracket 30 integrated with the hitch main body 17. The output clutch body 10 is rotatably supported around a horizontal arm shaft 31, and the output clutch body 10 is supported below the arm 29 so as to be rotatable about a horizontal pin 32.

As shown in FIG. 2, the arm shaft 31 of the arm 29 has an axis A of the clutch 11 substantially aligned with the center line A of the output clutch body 10 suspended by the arm 29.す る Construct so that it is at the tangential position. Further, a spring 33 is provided between the pin 32 and the bracket 30 to tension the output clutch body 10 rearward. A lock arm 35 is provided on the lateral side of the output clutch body 10 and rotates left and right by operating a lever 34. The lock arm 35 is engaged with the pin 32 and the like by rotating the lock arm 35 toward the output clutch body 10. hand,
The output clutch body 10 moves forward to prevent the clutch 11 from being disengaged.

The output clutch body 10 performs power transmission by spline-fitting with the input clutch body 9, and includes a power take-out shaft 7 on the vehicle body 1 side and an interlocking shaft 38 having an expansion joint 36 and a universal joint 37.
And are interlocked with each other by being freely movable back and forth by spline fitting.

The work machine body 5 is an example of a tilling device, in which connecting pins 21 project from left and right sides of a tilling transmission case 39, a suspension pin 18 is provided by a bracket 40 at an upper central portion, and an input including a spline shaft is provided on the front side. A shaft 8 is provided, and a spline shaft at the front end of the input shaft 8 is used as an input clutch 9.

When connecting the working machine 5, the working machine 5 is placed on the ground, the tractor body 1 is steered, and the link hitch 4 is opposed to the front surface of the working hitch 6. When the lift arm 12 is lowered, the seat 19 of the link hitch 4 is moved to the suspension pin 18 of the work hitch 6.
When the link hitch 4 is lifted by approaching the work hitch 6 by retreating the vehicle body 1 in a slightly lower position, the seat 19 scoops up the suspension pin 18 and raises the work hitch 6.
To rise.

When the work hitch 6 is moved upward with the rise of the link hitch 4, the work hitch 6 rotates forward around the suspension pin 18 due to the weight of the work machine body 5, and the lower connecting pin
21 fits into the front socket 22 to be in a connected state. At the same time, the input clutch 9 of the input shaft 8
Fit close to. The output clutch body 10 pressed by the abutment of the input clutch body 9 moves back and forth around the arm shaft 31 in a state of being suspended by the arm 29, and the axis centers and splines of the two clutch bodies 9, 10 match. Then, it automatically fits and moves in the axial direction, and is brought into a state where it can be integrally rotated in the rotation direction. At this time, the connecting pin 21 is simultaneously fitted into the socket 22 while pushing and opening the hook 24, is locked by the return by the spring 27, and maintains the connected state.

As described above, when the clutch 11 is fitted and connected, the output clutch body 10 is moved along the axis A of the clutch 11 by the swing of the arm 29 about the arm axis 31 as shown by the rotational arc trajectory line B. Therefore, the resistance between the output clutch body 10 of the clutch 11 and the input clutch 9 is small, and a quick occlusion can be maintained.

When the work hitch 6 is removed, the lock arm 35 is operated by the lever 34 out of the swing range of the output clutch body 10, and the lever 26 is manually or remotely rotated to rotate.
Remove the hook 24 from the connecting pin 21. As a result, the link hitch 4 is slightly lowered to remove the
, The work machine body 5 can be removed.

In FIG. 4, the difference from the above example is that the clutch 11 is configured as a dog clutch, and the clutch claws 41 protrude toward the opposite sides to form the output clutch body 10 and the input clutch body 9. However, the output clutch body 10 can be moved back and forth by spline fitting to the interlocking shaft 38 in the same manner as in the above example. Further, the arm shaft 31 which is the fulcrum of the arm 29 is deviated to the front side of the hitch main body 17 and is located immediately above the engagement position of the clutch pawl 41.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a perspective view showing a partly separated position, FIG.
The figure is a side view showing a partial cross section, and FIG. 4 is a perspective view showing a partly different embodiment. (Explanation of reference numerals) 1 ... body, 2 ... top link 3 ... lower link 4, ... link hitch 5 ... work machine body, 6 ... work hitch 7 ... power take-out shaft, 8 ... input shaft 9 …… Input clutch body 10 …… Output clutch body 11 …… Clutch

Claims (1)

(57) [Claims] 1. A work hitch 6 integrated with a work machine body 5 on a link hitch 4 attached between a tip end of a top link 2 and a lower link 3 provided to be able to move up and down with respect to a vehicle body 1.
An input clutch body 9 that receives the upper part of the body and swings the lower part back and forth to be detachably provided, and is rotated by a power take-out shaft 7 of the vehicle body 1 to rotate an input shaft 8 of the work machine; The power is provided by the engagement and disengagement of the movement of the output clutch body 10 in the forward and backward rotation circular arc trajectory line B direction attached to the lower portion of the arm 29 rotatably suspended about the arm shaft 31 provided on the hitch body 17 of the link hitch 4 as a fulcrum. The shaft center of the output clutch body 10 to be turned on and off is supported so as to rotate in the front-rear direction substantially along the axis A of the clutch 11 including the output clutch body 10 and the input clutch body 9. Work hitch of tractor working machine.