JPS62122505A - Quick hitch apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention responds to the need to attach a working implement to an agricultural tractor by quickly and mechanically attaching it by moving the tractor without requiring operator operation. This invention relates to a hitch device.

(B) Prior art Many quick hitch devices have been published in which a work implement can be attached to an agricultural tractor with a single touch. This is a technique such as that disclosed in Publication No. 34606.

The present invention further improves the conventional technique and relates to a configuration that also enables connection of the work machine drive shaft in conjunction with the installation of the work machine.

(c) Problems to be Solved by the Invention The purpose of the present invention is to eliminate as much manual labor as possible from the operator when installing various working machines on the rear of an agricultural tractor, and to improve mechanical and It is configured so that it can be attached and detached with one touch.

In addition, in the conventional technology, the work equipment can be attached and removed mechanically, but the work equipment drive shaft cannot be connected mechanically, and the connection work has to be done manually by the operator. The structure is such that the work machine drive shaft can be connected at the same time as the work machine is attached.

(d) Means for Solving the Problems The objects of the present invention are as described above. Next, the configuration for achieving the objects will be explained.

In a configuration in which the work implement is attached or detached by raising and lowering the hit side frame of the agricultural tractor, and the work implement drive shaft is connected in conjunction with the attaching operation of the pitch side frame, the pitch side frame is connected to the work implement. Providing an open locking part,
An engaging portion that engages with the locking portion is arranged on the working machine side.

In addition, a bearing support that supports the work equipment drive shaft on the pitch side frame is attached to the lower link guide through an elongated insertion hole, making it possible to adjust the mounting angle of the work equipment drive shaft with respect to the hit side frame. It is something.

(e) Embodiments and Functions The objects and structure of the present invention are as described above. Next, the structure of the embodiments shown in the attached drawings and the invention will be explained in detail.

Figure 1 is a side view of the quick hitch device of the present invention before installation, Figure 2 is a side view of the quick hitch device in the installed state, Figure 3 is a front view of the installed state, and Figure 4 is the work machine drive shaft. Exploded view of the support part, Figure 5 is a side sectional view of the work equipment drive shaft and input shaft, Figure 6 is a side view of the lower link guide and locking hook part, and Figure 7 is a side view of the work equipment drive shaft support part. 8 is a sectional view of the pivot portion of the lower link guide and the locking hook, and FIG. 9 is a bottom view of the lower link guide portion.

The overall configuration of the quick hit device of the present invention will be explained based on FIGS. 1, 2, and 3.

A three-point link mounting device protrudes from the rear of the agricultural tractor, and the top link 18 and two lower links on the left and right of the three-point link mounting device fit directly into the top link pin and lower link pin of the working machine. It will be worn. However, in the present invention, the top link and the lower link are not directly attached to the working machine, but a quick hit device is interposed between them, and then the top link and the lower link are attached to the working machine.

Therefore, the top link 18 is supported by the upper locking pin 39 at the upper end of the quick hitch device, and the lower link (
(not shown) has its rear end fitted into and supported by the lower locking pins 6 of the quick hitch device. The dot printer 18 and the left and right lower links support the quick hitch device, and the hydraulic lift arm rotates it up and down.

The quick hit device is mainly composed of a hitch side frame 1. The hit side frame 1 is constructed by bending a pipe material into an inverted U shape, and an upper locking pin 39 and a hit side upper end locking part 3 are installed at the highest position in the left and right center of the pitch side frame l. is formed into a hook shape. The upper end locking portion 3 locks the top link pin 9, which is an engaging portion on the working machine side, so as to scoop it up from below.

In addition, left and right end locking portions 2 are provided at the left and right ends of the hit side frame 1.
The lower link guide 2 that constitutes a.2a is fixed. The lower link guide 2 has the hit side frame 1 welded and fixed on the inside, and a locking hook bracket 17 is fixed on the outside. As shown in FIGS. 8 and 9, the locking hook bracket 17 supports the bases of the lower locking pins 6, 6, and the bases of the lower locking pins 6, 6 support the rotation of the locking hook 5. It also serves as the pivot axis. That is, the portion of the lower locking pins 6, 6 that protrudes laterally beyond the locking hook bracket 17 is used as a shaft into which the lower link of the tractor is inserted, and the portion of the lower locking pins 6, 6 is used as a shaft into which the lower link of the tractor is inserted. An integral part of the locking hook 5 and the release handle 4 is pivotally supported on the part supported between the locking hook 5 and the release handle 4. As shown in FIG. 6, the locking hook 5 forms a hook portion that surrounds the left and right end locking portions 2a, and is guided so that the back surface is retracted by the entry of the lower link pin 7 on the working machine side. It also makes up the surface. Therefore, when the tractor is moved backward, the lower link pin 7 is guided by the guide protrusion 2b of the lower link guide 2 and the back guide part of the locking hook 5, and the lower link pin 7 fits into the innermost left and right end locking parts 2a. Then, the locking hook 5 engages and serves as a stopper.

With this configuration, when the quick pitch device is attached to a working machine, the tractor is moved backward with the locking hook 5 biased toward the left and right end locking portions 2a, and the quick hit device is gradually raised from below. As the process progresses, the upper end locking part 3 first fits into the top link pin 9, and then the lower link guide 2
The guide protrusion 2b guides the pin bracket 15 on the work machine side inward to the normal position, guides the lower link pin 7 to the left and right end locking parts 2a, and locks the locking hook 5.
It is pushed open and fitted into the left and right end locking portions 2a, and is locked by the locking hooks 5 that are returned by the biasing springs and is prevented from being removed.

To release the locked state, rotate the release handle 4 equipped with a spring beyond the fulcrum to the release side, and move the quick hitch device forward while lowering it with a tractor. Since the hook 5 is retracted, the lower link pin 7 comes out from the left and right end locking portions 2a. Similarly, the portion of the upper end locking portion 3 that does not have a locking hook can be removed by moving it downward.

On the working machine side, a rotary tiller is shown, and a top link pin 9 is arranged on a top link mast 13 of the rotary tiller. Also bevel gear box 1
An input shaft 20 protrudes forward from 1, and the input shaft 20
The tractor's P
The power from the TO shaft is input to the bevel gear box 11.

Main beams 14L and 14R are attached to the left and right sides of the bevel gear box 11, and the main beams 14L and 14R are attached.
The pin brackets 15 are fixed to 14R. The lower link pin 7 is arranged on the pin bracket 15. When mounted on a normal tractor, the lower link pin 7 is inserted directly into the lower link on the tractor side. In the present invention, the lower link pin 7 for normal mounting can be used to constitute an quick pitch device.

Similarly, when the top link pin 9 supported by the top link mast 13 and the reinforcing stay 12 is attached to a normal work machine, the top link is directly fitted, and the quick hitch of the present invention The device has the advantage that it can be converted to one-touch installation by using ordinary work equipment as is.

16 is a tilling cover of the rotary tilling device, and 32 is a universal joint cover.

Next, the structure of the automatic connection portion between the input shaft 20 and the working machine drive shaft 25 will be explained based on the drawings of FIGS. 4 to 7.

The basic structure of the automatic coupling part is that the engaging pawl 22 fitted into the front end of the input shaft 20 and the engaging pawl 23 fitted into the rear end of the working machine drive shaft 25 are simultaneously engaged with the quick hitch device connection. It's also true.

For this purpose, the input shaft 20 is fixed at a fixed position on the work machine side, but the work machine drive shaft 25 has conventionally been free with respect to the tractor and has not been fixed in position. First, it is necessary to fix the quick hitch device in a fixed position. The work machine drive shaft 25 is fixed to the quick hitch device by a bearing support 8 and a bearing plate 2, which are suspended between the left and right lower link guides 2.
This is supported by 9.

However, both the work machine drive shaft 25 and the input shaft 20
If the shafts are fixed at a fixed position, the engaging pawls may be destroyed during power transmission rotation if the axes do not match, so in this bearing support 8, When supporting the shaft, it constitutes a movable gap for adjusting the axis.

That is, as shown in FIG. 6, of the fitting holes 2C and 2d for the bolts 40 for connecting the lower link guide 2 and the bearing support 8, the fitting hole 2d side is made into a long hole, and the screw hole 8b of the bearing support 8 is inserted into the fitting hole 8b. - The bearing support 8 can be rotated back and forth with respect to the lower link guide 2 by movement of the bolt 40 screwed into the lower link guide 2.

Although this configuration has shown the possibility of a gap in the back and forth movement of the work equipment drive shaft 25, it is further noted that the bearing plate 29 supported by the bolts 28 via the elastic plate 10 with respect to the bearing support 8 is It constitutes a movable gap. That is, the bolts 28 and 28 are connected to the bearing plate 29.
The nut 8e on the front side of the bearing support 8 is inserted from the rear side of the bearing support 8.
The fitting hole 2 of the bearing plate 29
9a is a large diameter hole so that the bolts 28 can be moved left and right inside. Due to this configuration, the bearing plate 29
The bearings 38 and 38 fitted and supported can form a gap that is movable back and forth and left and right with respect to the quick hit device, and due to this gap, the work equipment drive shaft 25 is moved between the input shaft 20 and the input shaft 20 during rotation. If there is a misalignment of the axis, alignment can be performed automatically.

Furthermore, as described above, the elastic plate 10 interposed between the bearing support 8 and the bearing plate 29 also provides a slight gap in the longitudinal direction.

Also, when connecting the work equipment and quick hitch device,
If the engaging claws 22 and 23 do not match, the claws will butt against each other and the left and right end locking portions 2a and the lower link pin 7 may not be in a locked state. be. In the present invention, even in this state, the engaging pawl 23 is configured to be retractable by the length of the pawl so that the left and right end locking portions 2a can be engaged with the lower link pin 7. .

That is, the spline cylinder of the engaging pawl 23 is fitted into the spline portion of the working machine drive shaft 25, and the engaging pawl 23 is able to slide back and forth by the spline portion. Then, the work machine drive shaft 25 starts rotating, and the engaging pawl 22
When the engaging claws 23 match, the urging spring 24 is biased from the front of the engaging claws 23 so that the matching state does not deviate.

In this case, the biasing spring 24 actually
However, in this embodiment, it is fitted to the engaging pawl 23 on the work machine drive shaft 25 side. As a result, the input shaft 20 is fixed to the input shaft 20 of the conventional bevel gear box 11 without any processing by simply fitting the engaging pawl 22 into the pin hole of the input shaft 2o using the fixing bolt 27. All you have to do is do it. If this were reversed and the attachment spring 24 was placed on the input shaft 20 side. Since it is necessary to provide the input shaft 20 with a hole for the O-ring 37 to stop the sliding of the meshing pawl, a hole for the C-ring 35 to lock the spring receiver 36 of the biasing spring 24, etc., it is not widely used. Therefore, it becomes impossible to use the existing working equipment as is and to attach it with a quick hitch device.

(F) Effects of the Invention Since the present invention is constructed as described above, it has the following effects.

First, a quick hitch device is attached to the top link and lower link on the tractor side, and the quick hitch device allows for one-touch mounting of the work equipment, so there is no need to change the tractor's three-point link mounting device. Without,
In addition, there is no need to change the top link bin, lower link pin, and input shaft on the work equipment side, and it is possible to configure a quick and hitch device by using conventional tractors and work equipment as they are. It was.

Second, by using the quick hitch device of the present invention, not only can a working machine and a tractor be connected, but also
At the same time, it has become possible to automatically connect work machine drive shafts and universal joints, which used to be a tedious task.

Thirdly, in the connection part between the bearing support that supports the work equipment drive shaft and the lower link guide, the 2d side of the fitting holes 2C and 2d is made into a long hole in the front and back direction, so the bearing support can be tilted back and forth. This made it possible to automatically adjust the angle of the work machine drive shaft relative to the quick hitch device. As a result, it is possible to match the axes of the joint between the working machine drive shaft and the input shaft.

[Brief explanation of drawings]

Figure 1 is a side view of the quick hitch device of the present invention before installation, Figure 2 is a side view of the quick hitch device in the installed state, Figure 3 is a front view of the installed state, and Figure 4 is the work machine drive shaft. Exploded view of the support part, Figure 5 is a side sectional view of the work equipment drive shaft and input shaft, Figure 6 is a side view of the lower link guide and locking hook part, and Figure 7 is a side view of the work equipment drive shaft support part. 8 is a sectional view of the pivot portion of the lower link guide and the locking hook, and FIG. 9 is a bottom view of the lower link guide portion. 1... Hit side frame 2... Lower link guide 2a... Right and left end locking portions 2b... Guide protrusions 2c, 2d... Fitting hole 3... Upper end locking portion 4... ...Release handle 5 ...Latching hook 6 ...Lower locking pin 7 ...Lower link pin 8 ...Bearing support 9 ...Top link pin 10 ...Elastic plate, 11...Bevel gear box 20...Input shaft 25...Work machine drive shaft

Claims (2)

[Claims] (1) In a configuration in which the work implement is attached or detached by raising and lowering the hitch side frame of the agricultural tractor, and the work implement drive shaft is connected in conjunction with the attachment operation of the hitch side frame, the work implement is attached to the hitch side frame. A quick hitch device characterized in that a locking portion is provided that opens toward the user, and an engaging portion that engages with the locking portion is disposed on the work machine side. (2) A bearing support for supporting the work machine drive shaft as set forth in claim 1 on the hitch side frame is attached to the lower link guide through the insertion hole formed by an elongated hole, and the work machine drive shaft is A quick hitch device characterized by being able to adjust the mounting angle to the hitch side frame.