JPS622766B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention is provided in a hydraulic actuation device of a tractor in order to set and operate the plowing depth to a predetermined value when performing plowing work using a ground-based work machine such as a rotary connected to a tractor. This invention relates to an operating mechanism for switching a switching valve.

In conventional tractors, the operating lever for operating this switching valve is a position lever for adjusting the vertical position of the work equipment, and a draft lever for adjusting the tilling resistance, for example, a double shaft that is inside and outside of each other. Generally, a structure is adopted in which the switching valves are operated via links provided on each of these dual shafts. However, these double shafts and links must be installed in a narrow space in the cylinder case, making assembly and adjustment work extremely inconvenient.Additionally, new operating levers are required for automatic control of plowing depth, etc. There are problems such as the lack of space for an attached building.

Therefore, the present invention is proposed to solve such problems, and its configuration will be explained based on an illustrated embodiment.As shown in FIG. The work equipment 2 is pivotally connected via lift rods 7, 7 to left and right lift arms 6, 6 of a work equipment lifting mechanism 5, which is pivotally supported by a lift shaft 4 on a hydraulic actuator 3. The spool 9 of the switching valve 8 provided in the actuating device 3 is provided so as to be movable from side to side, and the tension spring 10 always urges the spool 9 to move to the right as shown in FIG. ing. When the spool 9 is moved, for example, to the left, the piston 12 of the cylinder 11 protrudes to the right and lifts and rotates the lift arms 6, 6 via the lift shaft 4 and one arm 13. If the piston 12 is moved to the right, the piston 12 will retreat to the left, and if the spool 9 is in the middle position of the above-mentioned left-right movement, the pressure oil in the cylinder 11 will be held as it is and the piston 12 will move back to the left. Switching valve 8
is used to switch the pressure oil to the cylinder 11.

Therefore, in this invention, as shown in FIGS. 3 and 4, the operating shaft 15 is attached to the cylinder case 14.
The arm 16 is fixed to the operating shaft 15 inside the cylinder case 14, and the L-shaped link 17
The base of the L-shaped link 17 is pivotally connected to the operating shaft 15, and one end of the L-shaped link 17 is connected to the rotating base of the lift arm 6 via a link 18.
Attach the middle part of the position link 19 to the other end with pin 2.
The pin 21 installed on the spool 9 is inserted into the long hole provided at the lower end of the position link 19, and the upper end of the position link 19 is connected to the arm 1.
6 with a pin 22. The base of an L-shaped lever 23 formed in a roughly L-shape is fixed to the operating shaft 15 on the outside of the cylinder case 14, and a tension spring 68 is fixed at one end to the upper part 23a of the L-shaped lever 23. is the L-shaped lever 2 facing the back side of Figure 3.
The upper part 23a of 3 is energized so as to be pulled.

Then, attach the fan-shaped lever guide 24 to the cylinder case 14 with bolts 25, and
4, a vertical position adjustment lever 27 is rotatably fitted into a shaft 26 fixed to the shaft 26.
The lower arm 27a of the lower arm 27a of the L-shaped lever 23
3b, and the arm 28 whose base is rotatably fitted into the shaft 26 is provided so as to be able to abut the lower part 23b of the L-shaped lever 23.
This arm 2 has a pushable wire 30 that is inserted into the flexible tube 29 and has exposed portions at both ends made of a rigid body.
8, and the front part of this wire 30 is connected to the steering handle 32 via a link mechanism 31.
The lift lever 33 is engaged with a lift control lever 33 provided near the lift control lever 33, and the lift control lever 33 is constructed so as to be able to be held in two rotational positions by switching, for example, by a tampler.

Then, the lifting position adjustment lever 27 is provided so that it can be rotated to any angle and held by a holding bolt 34 inserted into the arcuate groove 24a of the lever guide 24, so that when the lift arms 6, 6 are in the upper position,
If this lifting position adjustment lever 27 is rotated toward the back side of FIG. 3 (counterclockwise in FIG. 4), the lower part 23b of the L-shaped lever 23, which is biased by the tension spring 68, will be moved as shown in FIG. Rotate toward the front from the paper surface,
The operating shaft 15 rotates the position link 19 through the arm 16 and the pin 22 counterclockwise in FIG. 2), the lift arms 6, 6 will be lowered. Then, the link 18 begins to descend together with the lift arms 6, 6, and the L-shaped link 17 rotates clockwise around the operating shaft 15 in FIG. 4, so that the position link 19 has already rotated. It rotates clockwise around the pin 22, which has stopped moving, and the spool 9 is pushed to the left in the figure and returns to the neutral position, and the switching valve 8 is turned off from the pressure oil from the cylinder 11. The ejection is stopped, and the lift arms 6, 6 are thus configured to maintain the position instructed by the elevation position adjustment lever 27.

Also, if the lift operation lever 33 is rotated in the downward direction instead of the lift position adjustment lever 27, the arm 28 will rotate toward the front from the plane of the paper in FIG. Similarly to the above, the lift arms 6, 6 are held in the lowered position by the rotation of the L-shaped lever 23 in the same direction, thereby forming an elevating position adjustment mechanism.

Next, as shown in FIG. 5, the tilling resistance adjustment mechanism for controlling the tilling resistance has an operating shaft 35 pivoted on the cylinder case 14, and a tilling resistance adjusting lever 36 fixed to the operating shaft 35 is moved from the lever guide 24. It can be rotated and held at any angle by a holding bolt 37 inserted into the arcuate groove 24b. Then, the draft arm 38 is rotatably fitted into the operating shaft 35 inside the cylinder case 14, and the arm 39 is fixed to the operating shaft 35, and the upper part of the draft link 41 with the actuator 40 attached to the lower part is attached. pin 42
The spool 9 is pivoted to the arm 39 so that the spool 9 can be pushed by the actuator 40 via the draft arm 38 as shown in FIG. Also, the draft rod 44 is fitted into the spring box 43 attached to the cylinder case 14 so as to be movable back and forth.
A spring 45 is provided to push and bias the draft rod 44 rearward, and a pin 47 is engaged with the lower end of an arm rod 46 attached to the front end of the draft rod 44, and is pivotally connected to the middle portion of the draft link 38. Loosely insert the front part of the rod 49 into the pin 48, and
A spring 50 loosely fitted onto the pin 47 and wound around the rod 49 always elastically pushes the draft link 38 to the left in FIG. The upper end of a bracket 52 pivoted at 51 is pivoted to the rear of the draft rod 44, and the front end of a top link 53, which is connected to the upper part of a ground work machine such as a plow (not shown), is connected to the bracket 52 by a pin 54. If the lifting position adjustment lever 27 is fully rotated in the downward direction, the tilling resistance acting on this ground work machine will be reduced by the spring 45.
If the value is larger than the value set in , the bracket 52 pushed to the left in FIG. The draft link 41, which is pushed and rotated, pushes the spool 9 to the left via the draft arm 38, and lifts the lift arm 6,
On the other hand, if the tilling resistance adjustment lever 36 is rotated to the left in the figure, the arm 3 will be raised.
Draft link 41 that rotates in the same direction as 9
The lower part moves to the right around the pin 48, so the spool 9 moves to the right and the lift arm 6,
6 lowers the ground work machine, and conversely, by rotating the tilling resistance adjustment lever 36 to the right, the lift arms 6, 6
will rise, and therefore, the plowing depth of the ground working machine, that is, the magnitude of the tilling resistance, instructed by the tilling resistance adjustment lever 36, is determined by the position of the pin 42, so the above instruction The draft link 41 is moved to a position where the spring 45 balances the tilling resistance.
is configured to move back and forth around the pin 42 to hold the ground working machine at the designated tilling resistance.

Then, as shown in FIGS. 5 and 6, the base of the feedback arm 56 is loosely fitted into the pin 55 fixed to the tilling resistance adjustment lever 36. In addition, as shown in FIG. 1, a rear cover 60 is pivotally attached to the rotary cover 58 that covers the top of the tiller 57 of the ground work machine 2 through a hinge 59. A plowing depth sensor 67 is configured to transmit the vertical swing of the rear cover 60 in sliding contact with the tilled soil surface to an L-shaped lever 62 pivotally connected to the tilled soil surface via a rod 63. The retractable feedback wire 64 is inserted through the flexible tube 65 and brought into contact with the rear surface of an arcuate receiver 66 fixed to the tilling resistance adjustment lever 36, so that the lower part of the feedback arm 56 is L-shaped. shaped lever 2
It is configured so that it always comes into contact with the rear surface of 3. If the lifting position adjustment lever 27 is operated and held at a certain position, the lift arms 6, 6 will rotate to a predetermined position, and then the spool 9 will be held at the neutral position. Turn the tilling resistance adjustment lever 36 to the left at the position indicated by the solid line in the figure.
If placed at the position indicated by the dotted chain line, the draft link 41 will also become the second
The spool 9 is rotated backward to the position shown by the two-dot chain line in the figure, but since the spool 9 is prevented from moving by the position link 19, at this moment the spool 9 is rotated backward by the draft link 41. does not protrude backwards. However, along with this leftward rotation of the tilling resistance adjustment lever 36, the feedback arm 56 rotates rearward about the receiver 66 that is in contact with the feedback wire 64 as a fulcrum, as shown by the two-dot chain line in FIG. Therefore, the L-shaped lever 23 moves rearward (in Fig. 5, from the page to the front),
Therefore, the spool 9 protrudes rearward from the switching valve 8 and rotates the lift arms 6, 6 downward, and the tilling resistance adjustment lever 36 moves the ground work machine 2 to a desired vertical position, that is, tilling. The tillage resistance adjusting lever 36 is placed in the position shown in FIG. 6, for example, and the lifting position adjusting lever 27 and the lifting operation lever 33 If the tilling work is performed by placing both levers at the extreme lowering positions of the work machine and making sure that these two levers do not come into contact with the L-shaped lever 23, then when the tiller body 57 is further lowered, the rear cover 60 will move away from the tiller body. 57, the feedback wire 64 moves forward, and as a result, the feedback arm 56 rotates forward about the pin 55 as shown by the two-dot chain line in FIG. The shaped lever 23 is configured to be able to automatically adjust the plowing depth by moving the spool 9 in the direction of raising the ground work machine 2 and returning the plowing depth of the tilling body 57 to its original state, thus reducing the tilling resistance. In tillage work using a rotary that does not require control, the tillage resistance adjustment lever 36 is used as the tillage depth setting lever 69. However, this plowing depth setting lever 69 is not limited to the embodiment in which it is fixed to the operating shaft 35 for adjusting the plowing resistance as described above, but it may also be rotatably provided on the machine body (not shown). The depth setting lever may have a structure in which the feedback arm 56 that can engage with the L-shaped lever 23 is pivotally connected as described above.

As shown in FIGS. 3 and 5, a rear wheel 70 and a fender 71 are provided close to each other on the outer right side of the plowing depth setting lever 69 and the elevation position adjustment lever 27.

As described above, in the switching valve operating mechanism according to the present invention, an operating shaft 15 equipped with an L-shaped lever 23 is pivotally supported on the machine body in order to operate the switching valve 8 for controlling the elevation of a ground work machine. The switching valve 8 can be operated via the L-shaped lever 23 by operating the elevation position adjustment lever 27, the elevation operation lever 33, and the plowing depth setting lever 69, which are pivoted separately from the lever 15. Therefore, it is possible to perform various types of control operations such as the following. That is,
To control the tilling resistance by connecting a ground work machine such as a plow so that the tillage resistance is maintained at a set value, connect the upper part of the ground work machine (not shown) through the top link 53 as shown in Fig. 2. If the lower part of the ground work machine is connected to the tractor 1 by left and right lower links pivotally connected to the lower parts of the lift rods 7, 7, the tilling resistance adjustment lever 36 can be used to set the tillage resistance adjustment lever 36. The vertical position of this ground working machine is controlled by the above-described operation so that the tilling resistance is increased. Furthermore, when the rotary is used as the ground working machine 2 as shown in FIG. The tilling reaction force is not fed back at all, so if the tilling resistance adjustment lever 36 is used as the tilling depth setting lever 69 and rotated as shown in FIG. The spool 9, whose movement is restricted by the position link 19 by only rotating rearward from the position indicated by the solid line in the figure, is completely free from the rotation movement of the draft link 41, and the feedback arm 56 As the feedback arm 5 rotates, this feedback arm 5
6 rotates the L-shaped lever 23, so the tillage resistance adjustment lever 36 adjusts the plowing depth of the ground working machine 2 in the same way as when the lifting position adjustment lever 27 is rotated. In addition, the tillage depth sensor 67 that slides on the tilled soil surface
The plowing depth is transmitted to the feedback arm 56 via the feedback wire 64, and the rotation of the feedback arm 56 is transmitted to the L-shaped lever 23, so the plowing depth setting lever 69 is used to provide instructions. This ground work machine 2 can be adjusted and controlled to the desired plowing depth.

Therefore, in plowing work using a rotary, the plowing depth is set using the plowing depth setting lever 69, and the ground work machine 2 is automatically controlled to raise and lower within the range of this set value, for example, when turning around near a headland. In this case, if the lifting position adjustment lever 27 is rotated to the raised position, the ground work equipment 2 will be hoisted high, and after the turning operation is completed, the lifting position adjustment lever 27 is moved to the lowermost position of the work equipment. If the rotational operation is performed, the ground working machine 2 will descend again and before going up, the plowing depth setting lever 69
The plowing depth returned to the specified plowing depth, making it extremely convenient for automatic control of plowing depth in plowing operations that do not use a tailwheel. In addition, a lift operation lever 3 provided near the steering handle 32
By switching 3 to the work equipment raised position or lowered position, the ground work equipment can be lifted high or lowered to the ground, so most of the turning operations and up and down operations of the work equipment can be done. This made it extremely convenient for work near headlands that had to be done at the same time.

Since the L-shaped lever 23 is provided to switch the switching valve 8 using these various operating levers, it is not necessary to provide new operating levers such as the plowing depth setting lever 69 and the lifting/lowering operating lever 33. ,
It is sufficient to provide an operating lever with a simple structure that can engage this L-shaped lever 23, and there is no need for a time-consuming structure such as directly pushing the spool 9 of the switching valve 8. It was also possible to easily change the specifications of the number of operating levers depending on the situation.

[Brief explanation of the drawing]

Each figure shows one embodiment of the present invention. Figure 1 is a side view of the entire tilling operation, Figure 2 is a vertical left side view of the main part of the tilling resistance adjustment mechanism, and Figure 3 is a vertical position adjustment mechanism. Fig. 4 is a partially cutaway left side view of the main part of the elevating position adjustment mechanism;
The figure is a longitudinal cross-sectional rear view of the main part of the tilling resistance adjustment mechanism, and FIGS. 6 and 7 are explanatory diagrams showing the respective operating states of the tilling resistance adjustment lever. Code explanation, 1...tractor, 2...ground work machine,
3...Hydraulic actuation device, 4...Lift shaft, 5...Work equipment lifting mechanism, 6...Lift arm, 7...Lift rod,
8...Switching valve, 9...Spool, 10,68...Tension spring, 11...Cylinder, 12...Piston, 13,1
6, 28, 39... Arm, 14... Cylinder case, 15, 35... Operating shaft, 17... L-shaped link,
18, 19...link, 20, 21, 22, 42,
47, 48, 51, 54, 55, 61...pin, 2
3, 62... L-shaped lever, 23a... Upper part, 23b
...lower part, 24...lever guide, 24a, 24b...
Arc-shaped groove, 25... Bolt, 26... Shaft, 27... Lifting position adjustment lever, 27b... Lower arm, 29, 65
...Flexible tube, 30...Wire, 31...Link mechanism, 3
2... Steering handle, 33... Lifting operation lever, 34, 37... Holding bolt, 36... Tilling resistance adjustment lever, 38... Draft arm, 40... Operator, 41... Draft link, 43... Spring box, 44
...Draft rod, 45,50...Spring, 46...Arm rod, 49,63...Rod, 52...Bracket, 5
3... Top link, 56... Feedback arm, 57... Cultivating body, 58... Rotary cover, 59
... Hinge, 60 ... Rear cover, 64 ... Feedback wire, 66 ... Reception, 67 ... Plowing depth sensor, 69
...Plowing depth setting lever, 70...Rear wheel, 71...Fender.

Claims (1)

[Claims] 1. In a hydraulic system operation mechanism configured such that the valve 9 of the lifting position adjustment mechanism of the ground work machine 2 connected to the tractor 1 can be operated by the operation lever 36 of the tilling resistance adjustment mechanism, the valve 9 is An operating shaft 15 of the link mechanism is inserted and supported in and out of the cylinder case 14 which houses a link mechanism for operation, and an L-shaped lever 23 is provided on the outside of the operating shaft 15. The detected plowing depth of the ground working machine 2 is provided so as to be fed back to the valve 9 via the feedback arm 56 pivotally supported on the operating lever 36 and the L-shaped lever 23, and the operating shaft 15
An L-shaped lever 2 is attached to the lever shaft 26 provided on the outside of the lever shaft 26.
An operating lever 27 is provided for adjusting the elevation position by contacting the steering wheel 32, and an elevation operating lever 33 is provided near the steering handle 32. On the arm 28 which is movably attached,
The lift operation lever 33 is locked via the link mechanism 31 and the wire 30, and the arm 28 is formed so as to be able to press against the L-shaped lever 23, and furthermore, when the lift operation lever 33 is operated, An operating device for a hydraulic operating device in a powered agricultural machine, characterized in that the L-shaped lever 23 is actuated and feedback is provided to the valve 9.