JPH0515204A - Connecting device of tractor working machine - Google Patents

Abstract

PURPOSE:To readily attach or detach a universal joint to a joint holder by forming holder grooves on both the sides of the joint case of the universal joint and subsequently fitting holder pins into the joint holder. CONSTITUTION:Holder grooves 36 each having a lower end opening 53 are formed on both the sides of a joint case 34 covering an universal joint 10. Holder pins 35 are projected on the inner sides of a gate-type joint holder 11, and while being faced to the inner sides of the joint holder, the openings of the holder grooves are guided and fit onto the holder pins from the upper side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tractor working machine connecting device for easily mounting and interlocking a working machine by a hitch mounted on an end of a three-point link mechanism of a tractor vehicle body.

[0002]

2. Description of the Related Art The technique disclosed in Japanese Unexamined Patent Publication (Kokai) No. 2-128610 engages with a connecting pin on a working machine side on both left and right sides of a hitch body that connects a top link and a lower link. A hitch hook lever for maintaining the connecting position is provided, and a universal joint at the tip of the transmission shaft is detachably held in the center of the hitch body.

In such a connecting device, when the connecting pin on the working machine side is connected to the hitch body by the hitch hook lever, the universal joint of the transmission shaft and the input shaft on the working machine side are fitted together. Although it is connected and ready to be transmitted, it is difficult to fit the universal joint and input shaft accurately, and the universal joint and the transmission part on the working machine side can be rotated manually, and the proper connection state can be achieved. Therefore, it is troublesome.

[0004]

According to the present invention, a universal joint 10 at the tip of a transmission shaft 9 can be attached to and detached from the inner side of a hitch body 4 which is connected to a top link 2 at a rear portion of a vehicle body 1 and a pair of left and right lower links 3. A joint holder 11 which is held at the front and rear and is swingable back and forth, and a joint hook 12 which fixes the holding position of the universal joint 10 with respect to the hitch body 4 are provided. A holder pin 35 is projected inside the gate-shaped joint holder 11 straddling both the left and right sides of the universal joint 10, and a holder groove 36 is formed at the lower end along the vertical direction on both the left and right sides of the joint case 34 that covers the universal joint 10. The holder groove 36 is provided in the holder. The pin 35 by fitting the guide to the structure of the coupling device of the tractor working machine, characterized in that the detachable.

[0005]

The joint holder 11 holds the universal joint 10 at the tip of the transmission shaft 9 on the hitch body 4 at the tip of the top link 2 and the lower link 3. At this time, the joint case 34 is looked into the gate-shaped joint holder 11, and the left and right holder grooves 36 are positioned above the holder pins 35 inside the joint holder 11, and the lower end opening 53 of the holder groove 36 is located. The part is fitted to the holder pin 35. When the hitch body 4 is brought close to the connecting portion of the work body 6 in this state, the universal joint 10 is fitted to the input shaft of the work body 6. When the space between them is not directly fitted, the swingable joint holder 11 is pushed and swung by the contact between the universal joint 10 and the input shaft. In this state, by manually turning the transmission shaft 9 or the working machine 5 side, fitting between the universal joint 10 and the input shaft is performed. In this state, fix the hitch body 4 to the working machine side with the joint hook 12,
You can do the work.

In this way, the holder groove 36 of the lower end opening 53 is formed on both left and right sides of the joint case 34 which covers the universal joint 10, and the opening 53 of the holder groove 36 is formed.
While looking into the joint holder 11, hold pin 3
Since the fitting guide is provided on the upper side of the universal joint 5, the universal joint 10 can be easily attached to and detached from the joint holder 11. Further, when the hitch body 4 is connected to the working machine, the universal joint 10 on the side of the hitch body 4 is held by the joint holder 11 which can swing back and forth. Even when the hitch body 4 and the working machine are not directly fitted to the input shaft, the fitting hooks of the universal joints 10 are smoothly connected to the input shaft, and the joint hook 12 makes this connection state. Can be fixed, and the universal joint 10 can be easily and easily attached and detached.

[0007]

[Example] The tractor body 1 is a steering wheel 1
The front wheel 14 and the rear wheel 15 which can be steered by 3 are
A four-wheel drive mode in which the vehicle is driven by an engine 16 mounted on the front to travel, and a transmission case 18 behind the cockpit 17
A pair of left and right lower links 3 and a top link 2 which are moved up and down by a lift arm 19 are attached, and a power output shaft 20
Is provided. A hitch body 4 for connecting the working machine 5 is attached to the rear ends of the lower link 3 and the top link 2, and a transmission shaft 9 for transmitting the working machine 5 is attached to the power take-off shaft 20.

The hitch body 4 is formed by forming a round pipe into an inverted U shape, and the upper end portion of the hook 2 is engaged with the hook pin 22 at the upper end of the mast 21 of the working machine 5 so as to scoop it up.
3 has a connecting bracket 2 for connecting the top link 2
Attach 4 detachably. This connecting bracket 24 is
Cross section H by connecting a pair of left and right plates with a connecting plate
As a form, a fitting base of the hook 23 to the hitch body 4 is fitted so as to sandwich it, and the fitting bolt is inserted through the fitting portion across the left and right, and a tip end portion of the top link 2 is fitted to a front end portion. They can be joined together and inserted through the connecting pin 26 to be rotatably connected. As the connecting bracket 24, a plurality of types A and B having different specifications of the pin hole 28 of the connecting pin 26 with respect to the bolt hole 27 of the mounting bolt 25 are prepared, and adapted to different types of tractors. In particular, in a form in which the vehicle height greatly changes due to a change in the wheel diameter, the connection pin 2 is selected by selecting the connection bracket 24.
It is advisable to attach a device that adapts the height position of 6.

At the lower outer end of the hitch body 4, there is integrally provided a connecting plate 30 having pin grooves 29 which fit into the connecting pins 7 protruding to the left and right sides of the working body 6, and the connecting plate 30 is provided at the rear. A guide surface whose end is open to the outside is formed so that the work body 6 can be easily guided and guided. The lower link pin 31 can be laterally projected at the outer lower end of the connecting plate 30 to fit and connect the rear end of the lower link 3.

The hitch hook lever 8 is connected to the connecting plate 3
0 and the lower link 3 are rotatably provided around the lower link pin 31 and have a hook 32 that engages with the connecting pin 7 fitted in the pin groove 29 of the connecting plate 30. The pin groove 29 is closed by rotating the pin 8 to the rear side to prevent the connecting pin 7 fitted therein from coming out.

The joint holder 11 is a hitch body 4
Holders on both left and right sides of a joint case 34, which is provided on the inner side of the lower end of the joint case 34 and hangs swingably back and forth with the upper end as a support shaft 33 and the universal joint 10 is rotatably covered on the lower rear side. The holder pin 35 that fits and supports the groove 36 is projected inward, and the left and right joint holders 11 are formed in a gate shape to be integrated. The holder groove 36 is formed on the left and right sides of the joint case 34 by fixing the brackets 54 in the vertical direction, and is formed along the vertical direction in which the bracket 54 fits with the holder pins 35, and the opening 53 is formed at the lower end. The holder pins 35 are made to project from the left and right sides of the joint holder 11 so as to face inward. Holder pin 3 of this joint holder 11
The universal joint 10, which is supported by fitting the holder groove 36 to the member 5, is suspended in the hitch body 4 in a state of being swingable back and forth. Reference numeral 37 is a reinforcing member that integrally connects the left and right side portions of the hitch body 4, and a supporting piece 38 is projected from the reinforcing member 37 to the front side so as to be rotatably suspended by the support shaft 33 of the gate-shaped joint holder 11. I'm lowering it.

Further, the joint holder 11 is provided with a joint hook 12 so that the joint holder 11 can be fixed to the hitch body 4 by swinging the joint holder 11 back and forth. The joint hook 12 is rotatably provided around the hook shaft 39 at the outer lower portion of the joint holder 11, and the joint hook 12 is rotated downward from above the groove opening of the holder groove 36 to project inward from the hitch body 4. When the joint holder 11 is fixed in a state of being pulled toward the hitch body 4 side from the front, the universal joint 10 held by the joint holder 11 serves to engage the lock pin 40. The input shaft 41 on the side is spline-fitted to be ready for transmission.

The joint holder 11 is elastically urged toward the rear side of the hitch body 4 by a spring 42, and is stopped at a fixed position by a stopper or the like. or,
The hitch hook lever 8 has a toggle spring 43 between the hitch hook lever 8 and the joint holder 11, so that the hitch hook lever 8 can spring into a state in which the connecting pin 7 is locked when the dead center is exceeded and a state in which the connecting pin 7 is disengaged. The left and right joint hooks 12 and the hitch hook lever 8 are connected by an interlocking rod 44, and by rotating the hitch hook lever 8 toward the rear working machine 5 side, the interlocking rod 44 is interposed. The joint hook 12 is pivoted rearward to engage with the lock pin 40. Further, in this state, the joint holder 11 cannot be swung forward against the spring 42, but by rotating the hitch hook lever 8 in the direction opposite to the arrow C, the joint hook 12 is rotated. And the joint holder 11 can be rotated forward against the spring 36. Four
Reference numeral 5 denotes a connecting member that integrally connects the left and right joint holders 11 and can receive the universal joint 10 on the upper side.

The toggle spring 43 elastically springs the hitch hook lever 8 into a state in which it is closed toward the pin groove 29 side and a state in which it is opened forward. When the connecting pin 7 which is going to be fitted approaches (arrow D in FIG. 6), the hitch hook lever 8
Is pushed slightly forward around the lower link pin 31 to open the pin groove 29 by the hook 32, so that the connecting pin 7 is automatically fitted into the pin groove 29. When the connecting pin 7 is fitted into the pin groove 29, the hook 32 is closed, and the connected state of the work body 6 can be fixed.

In the working machine 5, for example, when a cultivating device is illustrated, the cultivating transmission case is used as the working body 6, the input shaft 41 of the spline is projected to the front side, and the transmission mechanism in the working body 6 is rotated by the rotation of the input shaft 41. Through the tiller 4
The cultivating shaft 47 on which the 6 is arranged is driven to transmit power. The connecting pins 7 are provided on both left and right sides of the input shaft 41 so that the pin grooves 29 of the connecting plate 30 can be fitted and the hooks 32 of the hitch hook lever 8 can be engaged. Mast 21 is
A hook pin 22 that can be engaged with the hook 23 is provided at the upper end of the work body 6 so as to project upward, and an adjusting handle 49 for adjusting the height of the gauge wheel 48 is provided.

The transmission shaft 9 interlocks between the power take-up shaft 20 and the input shaft 41, and has universal joints 10 at the front and rear ends of a telescopic shaft 50 which can be expanded and contracted by spline fitting. Power take-off shaft 20
The input shaft 41 and the input shaft 41 are spline-fitted to be interlocked with each other. A cylindrical cover 51 is provided on the outer periphery of the transmission shaft 9, and the universal joint 10 is rotatably supported in the joint case 34 by a bearing 52.
The bracket 54 of the holder groove 36 engaged with the joint holder 11 is provided on the outer periphery of the joint case 34.

The hitch body 4 thus constructed is
The lower link 3 is fitted to the lower link pin 31, the top link 2 is connected to the connecting bracket 24 to the pin 26, the universal joint 10 at the front end of the transmission shaft 9 is fitted at the power take-off shaft 20, and the universal joint at the rear end is fitted. Insert the holder groove 36 of the housing 34 of the joint 10 into the joint holder 1
The holder pin 35 of No. 1 is fitted and supported.

At this time, the space between the left and right holder pins 35 of the joint holder 11 is narrower than the space between the left and right holder grooves 36. Therefore, the holder groove 36 is inserted downward from the front side while being properly tilted. While being supported and guided by the lower connecting member 45, the lower connecting member 45 is moved to the front side to fit the left and right holder grooves 36 into the left and right holder pins 35 of the joint holder 11. Further, each hitch hook lever 8 is rotated in the direction opposite to the arrow C to move the pin groove 29 of the connecting plate 30.
It may be left open.

In this way, the hitch body 4 attached to the top link 2 and the lower link 3 is made to face the front of the work body 6 of the work machine 5 and is vertically moved by the vertical rotation of the lift arm 19, and the hitch body 4 is moved up and down. The hook pin 22 on the working machine 5 side is scooped up and engaged by the hook 23 of the body 4, and the working machine 5 is floated from the floor surface. Work machine 5
When is floated, the input shaft 41 portion moves toward the universal joint 10 side around the hook pin 22 portion due to its own weight, and the spline fitting is performed. When the degree of fitting is insufficient, the tilling claw 46 is manually turned, or the clutch of the power take-off shaft 20 is loosely engaged and rotated to bring the two 41 and 10 into the fitted state. At this time, due to the action of the spring 42 that pulls the joint holder 11,
The universal joint 10 is bulged so that it can always be fitted to the input shaft 41 side. The left and right connecting pins 7 of the work body 6 are also fitted in the pin grooves 29.

The universal joint 10 is attached to the input shaft 41.
When the left and right hitch hook levers 8 are previously operated in the opposite arrow C direction (FIG. 7), the left and right hitch hook levers 8 are rotated in the arrow C direction (FIG. 8). The hook 32 of the hitch hook lever 8 is engaged with the connecting pin 7 fitted in the pin groove 29 to prevent the connecting pin 7 from coming off. In conjunction with the hitch hook lever 8, the joint hook 12 is rotated around the hook shaft 39 via the rod 44, and the lock pin 40 of the hitch body 4 is passed over the holder pin 35 fitted in the holder groove 36. To fix the joint holder 11 and the universal joint 10 in place with respect to the hitch body 4. At this time, the toggle spring 43 maintains the connection position of the hitch hook lever 8.

When the work body 6 is connected with the hitch hook lever 8 being rotated in the direction of arrow C in advance, the hook 32 is opened into the pin groove 29 by the approach D of the connecting pin 7. Since the hook 32 is fitted and engaged by the return of the hook 32, the engagement of the connecting pin 7 can be automatically fixed without operating the hitch hook lever 8.

When the connection of the working machine 5 is released, the reverse operation to the above may be performed. In FIG. 10, a point different from the above example is that a shaft joint 55 capable of fitting and interlocking with the universal joint 10 is provided at the tip of the input shaft 41 on the working machine 5 side so as to extend and contract via a spring 56. The connection between the input shaft 41 and the universal joint 10 when the working machine 5 is connected is smoothly performed.

The shaft coupling 55 is spline-fitted to the outer periphery of the input shaft 41 so as to be movable in the axial direction. A lid 57 is integrally provided on the tip end surface of the input shaft 41. The lid 57 and the end surface of the input shaft 41 are integrated. The shaft 56 is tensioned forward by interposing a spring 56 between and. Further, on the outer peripheral surface of the shaft joint 55, engagement claws 58 or splines which are phase-engaged with or interlocked with the universal joint 10 are formed.

[Brief description of drawings]

 The figures show an embodiment of the invention.

FIG. 1 is an exploded perspective view of a working machine connecting portion.

FIG. 2 is a side view of a part thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is an external perspective view of a part thereof.

FIG. 5 is a partial plan view.

FIG. 6 is a side view showing a part of the operation.

FIG. 7 is a side view showing a part of the operation.

FIG. 8 is a side view showing a part of the operation.

FIG. 9 is an overall side view.

FIG. 10 is an exploded perspective view showing another embodiment of the input shaft portion.

[Explanation of symbols]

 1 vehicle body 2 top link 3 lower link 4 hitch body 9 transmission shaft 10 universal joint 11 joint holder 12 joint hook 34 joint case 35 holder pin 36 holder groove 53 opening 54 bracket

Claims (1)

Claims: 1. A universal joint 10 at the tip of a transmission shaft 9 is detachably held on the inner side of a hitch body 4 that is connected to a top link 2 at the rear of a vehicle body 1 and a pair of left and right lower links 3. Joint holder 1 that can swing back and forth
1 and a joint hook 12 for fixing the holding position of the universal joint 10 with respect to the hitch body 4.
In order to attach and detach the universal joint 10 to and from the joint holder 11, a holder pin 35 is projected inside the gate-shaped joint holder 11 straddling both sides of the universal joint 10 to cover the universal joint 10. A holder groove 36 for opening 53 at the lower end is provided on both the left and right sides of the holder pin 3 in the vertical direction, and the holder groove 36 is formed in the holder groove 36.
A coupling device for a tractor working machine, characterized in that the tractor working machine is attached and detached by being fitted and guided by the 5.