JPS5930649Y2 - Agricultural tractor work equipment mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a work implement mounting device for an agricultural tractor, particularly one having a draft control device.

In general, draft control devices for agricultural tractors are
A rotatable link bracket that supports the top link is provided at the rear of the hydraulic lift, etc., and this link bracket is connected to a sensor spring for load detection, and an appropriate link is also provided between the link bracket and the hydraulic control unit. A mechanism is provided to connect them to each other, and when the working resistance in the soil acting on the top link becomes greater than the spring pressure of this sensor spring, the link bracket rotates while compressing this sensor spring, and the link bracket rotates while compressing this sensor spring. When the work equipment is pulled up, a force in the opposite direction is applied to the top link due to the weight of the work equipment, and at the same time, the sensor spring stretches and lowers the work equipment. It is configured like this.

However, such draft control devices are not necessarily strong enough, and if a hydraulic top link with a hydraulic device or a special three-point link mechanism using a relatively long special bracket is installed,
When the work equipment is pulled up, the distance from the point where the work equipment's own weight is applied to the rotational fulcrum of the link bracket is long, so the moment becomes extremely large, and therefore the connection between the link bracket and the sensor spring is subjected to a large amount of force. A large amount of force will be applied and the part will be damaged.

Therefore, conventionally, when installing such a link mechanism, it is necessary to work without using a draft control device, but in order to do so, the draft control device section must be removed and replaced. , it was extremely troublesome.

As a solution to such problems, the
As in No. 50538, there is a device in which a stopper is used to connect the link bracket and the fixed part, and when the draft control is not used, this stopper is used to prevent damage to each part.

However, in such a conventional structure, the stopper and the link bracket are simply connected by one pin, that is, the stopper is rotatable with respect to the link bracket. If the stopper is disconnected from the fixed part to use the draft control device with this stopper attached, the stopper will swing while driving or working and may collide with other parts, causing loud noise. Moreover, if such a stopper is attached, the link bracket cannot be rotated and the draft control device cannot be used.

The present invention solves the drawbacks of the conventional structure, and allows the draft control device to be used even with the stopper attached by simply pulling out the pin. The purpose is to provide a structure that does not generate large noise even when a draft control device is used.

In order to solve this problem, in the present invention, a link bracket mounted rotatably around a fulcrum axis is interlocked with a load detection sensor, and the working resistance transmitted through the top link is determined by the setting of this sensor. In a mounting structure for a work machine on a tractor, in which the sensor is compressed and the work machine is pulled up when the pressure becomes larger than the pressure, the link bracket is provided with a link bracket stopper that rotates together with the link bracket. The present invention is characterized in that a fixing pin is inserted and fixed into the stopper and a fixing part provided at the rear of the tractor, thereby preventing the link bracket from rotating.

The structure of the present invention will be explained based on drawings showing one embodiment. Fig. 1 shows the entire tractor to which a rotary working machine is attached via a standard three-point linkage mechanism, 1 is a clutch housing, 2 is a A transmission case 3 connected to the rear part of the clutch housing 1 is connected to the transmission case 2.
4 is a lift arm attached to the hydraulic case 3, and the rotary work machine 5 has a three-point link consisting of one top link 6 and two lower links 1 and 7. The lower link 7 is rotated via a lift rod 8 attached to the rear part of the mission case 2 and connected between the lift arm 4 and the lower link 7 via a mechanism, thereby raising and lowering the working machine 5. At the same time, the PTO shaft 9 protrudes from the rear of the mission case 2,
A rotary 11 is configured to be driven by a transmission shaft 10 connected to the PTO shaft 9 via a universal joint.

FIG. 2 shows the structure of the draft control device with such a configuration. In the figure, 12 is a sensor rod fitted into the rear part of the hydraulic case 3 so as to be movable in the vertical direction. Spring holder 1
A sensor spring 15 for detecting a load is provided between the hydraulic case 3 and the top wall 14 of the hydraulic case 3.

16 is an adjustment nut screwed onto the upper end of the sensor rod 12 in order to regulate the amount of downward movement of the sensor spring 15 and the spring receiver 13; It shows the regulation plate installed in the middle.

On the other hand, a top link 6 is attached to the rear extension part of the hydraulic case 3.
A link bracket 20 having two connecting holes 18 and 19 on the upper and lower sides is rotatably mounted on a fulcrum shaft 21, and a sensor arm 22 extending forward from this link bracket 20 is connected to the spring. The cylinder shaft 23 is welded to the spring bearing 13, and the rotating shaft 24 inserted into the cylinder shaft 23 connects the spring bearing 13 to the spring bearing 13.

Similarly, this link bracket 20 is connected to a hydraulic control section (not shown) of the hydraulic case 3 via an appropriate link mechanism 25, and when the link bracket 20 rotates clockwise in the figure, this link mechanism 25 The hydraulic control unit is actuated via the lift arm 4 to lift the working machine 5.

The top link connecting holes 18 and 19 are selected and used as appropriate depending on the working machine, and the working resistance in the soil transmitted through the top link 6 is transmitted to the sensor through the link bracket 20. The spring 15 is installed in a selected position that compresses the spring 15, such as the lower connecting hole 19 in the case of a plow and the upper connecting hole 18 in the case of a rotary car.

Next, as shown in FIG. 4, 26 in FIG. These are two link bracket stoppers having a mounting hole 28 and a top link connecting hole 29 that fit into the connecting holes 19, 19, respectively, and a fixing hole 30 drilled at the lower end of the forward slope. 26 is integrally attached to the outside of the link bracket 20 by bolts 31 and 32 inserted into the above-mentioned attachment holes 27 and 28 and the corresponding connection holes 18 and 19 of the link bracket 20.

Furthermore, a connecting pin 34 for connecting a hydraulic top link 33 is inserted into the top link connecting hole 29 of the stopper 26 and the connecting hole 19 of the link bracket 20 that fits therewith.

35 is - a locking pin inserted into one end of the connecting pin 34;
36 is a pull-out ring attached to one end of the locking pin 35.

37 is the upper and lower horizontal frames 38.39 and the left and right vertical frames 40.4
A fixing bracket assembled into a rectangular frame shape by 1 and 4, and a fixing piece 43.
3 are provided facing each other, and two upper and lower bolts 45 are attached to the fixing plates 44° 44 attached to the left and right sides of the back.
．． 46, it is fixed to the rear side wall of the mission case 2.

9 is a PTO shaft protruding from the rear of the mission case 2;
47 is a hood-shaped PTO guard that further surrounds this PTO shaft 9 and PTO shaft safety cover 41, and the PTO shaft safety cover 8 that surrounds this PTO shaft 9.
The O-guard 48 is fastened together with bolts 45 and 46 that attach the fixing bracket 31, and the fixing bracket 37 is attached so as to surround the PTO guard 48.

A fixing pin 49 is removably inserted into the fixing hole 30.30 at the lower end of the link bracket stopper 2626 and the defining hole 42.42 at the upper part of the fixing bracket 3T. 20 is fixed to prevent rotation, and in this way a work implement mounting arrangement is realized that does not use a draft control device.

50 is a locking pin inserted into one end of the fixing pin 49; 51
is a pull-out ring attached to one end of the locking pin 50.

The above-mentioned FIG. 4 shows the case where the hydraulic top link 33 is attached, and when the bracket 52 in the special three-point link mechanism is attached, the structure is as shown in FIG. 5.

That is, as shown in this figure, the connecting pin 34 for the hydraulic link is removed, and the two left and right brackets 52,
52 is interposed between the link bracket 20 and the stopper 26, and a mounting hole 53 is formed in the bracket 55.
, 54, the link bracket 20 and the stopper 26
The bolts 31 and 32 are inserted into the connecting holes 18 and 19 and the mounting holes 27 and 28 to be fixed.

In the above, the bracket 52 for the special three-point link mechanism
It is also possible to attach the hydraulic top link 33 with the bracket 52 and connecting pin 34 attached, or if you want to attach a standard three-point link mechanism with the bracket 52 and connecting pin 34 attached, you can attach the fixed pin If the link bracket 49 is removed, the link bracket 20 can be freely rotated, so that the draft control device can be used as is.

In summary, the present invention provides a link bracket with a link bracket stopper that rotates together with the link bracket, and fixes the link bracket by inserting a fixing pin into the stopper and a fixing part provided at the rear of the tractor. The bracket is designed to prevent rotation, so when installing a hydraulic top link or 3-point special link that does not use a draft control device, you only need to insert the fixing pin; When installing a three-point link mechanism, you can remove the fixing pin, rotate the link bracket, and use the draft control. The mechanism, hydraulic top link, and standard three-point link mechanism can be used together, and all that is required is to insert and remove the fixing pin, so the operation is easy and the structure itself is simple.

In addition, in the present invention, even if a large moment is applied due to the weight of the work machine when the work machine is pulled up, the catch can be stopped by the fixed part of the stopper.
The force acting on the connection between the link bracket and sensor spring is extremely weak, eliminating the risk of damaging this part.

Furthermore, the stopper of the present invention is attached to rotate together with the link bracket, so even if the connecting pin between the stopper and the fixed part is removed, the stopper will swing during travel or work, causing noise. Moreover, since the stopper is structured to rotate together with the link bracket, it is possible to use the draft control device with the stopper attached by removing the fixing pin as described above.

[Brief explanation of drawings]

Fig. 1 is an overall view of the tractor, Fig. 2 is a longitudinal sectional view of the draft control device, Fig. 3 is a longitudinal sectional view showing the installed state of the device of the present invention, and Fig. 4 is a front view of the link bracket stopper. 5 and 6 are rear views of the tractor showing the installed state of the device of the present invention. 5...Mark-tally work machine, 6...Top link, 15...Sensor spring, 20...
...link bracket, 21...fulcrum shaft,
26... Link bracket stopper 31.
...fixing bracket, 49...fixing pin.

Claims (1)

[Scope of utility model registration request] A link bracket mounted rotatably around a fulcrum axis is interlocked and connected to a load detection sensor, and when the working resistance in the soil transmitted through the top link becomes greater than the set pressure of this sensor, the sensor is compressed and the work is stopped. In the mounting structure of a working machine on a tractor that is adapted to pull up a machine, the link bracket is provided with a link bracket stopper that rotates together with the link bracket,
A working equipment mounting device for an agricultural tractor is constructed in such a manner that a fixing pin is inserted into and fixed to the stopper and a fixing part provided at the rear of the tractor, thereby preventing rotation of the link bracket.