JPH083211Y2 - Connecting device for tractor of tractor - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a connecting device between a tractor and a towing work machine such as a compost spreader, and particularly means for easily connecting and disconnecting the tractor and the towing work machine. To a tractor of a towing work machine having

[Prior Art] As a proposal for connecting a towing work machine to a tractor, a connecting device for a towing type agricultural work machine shown in FIG.
No. 0106) is proposed.

In this proposal, with the lower link a of the tractor lowered, the tractor is retracted to the working machine side to stop the tractor at a predetermined approach position, and the lower link a is moved up and down so that the recesses of the upper and lower hitch fittings b1 and b2 are recessed. By engaging c1 and c2 with the upper and lower engaging pins d1 and d2, respectively, the working machine-side connecting member e and the tractor-side connecting member f are connected to each other so that they can be pulled and run. By coupling operation, the bearing boss h is slid to couple the input shaft k and the power transmission shaft 1 to enable power transmission.

[Problems to be Solved by the Invention] However, the above proposal has the following problems, and there is still room for improvement.

At the same time when the working machine side connecting member e is connected to the tractor side connecting member f, the bearing boss h is not connected to the shafts k and l, but after both connecting members e and f are connected, the lever g is operated to operate the bearing boss. Since h is connected to axes k and l, both connecting members e and f
Extra lever operation must be performed when connecting the.

Both connecting members e and f are the recesses of the upper and lower hitch fittings b1 and b2.
A three-point link type (see FIG. 5) in which c1 and c2 are engaged with and connected to the upper and lower engaging pins d1 and d2, and the connection is rigid, and the drawpa i can be raised and lowered freely. Since it is a structure that cannot be rocked, there is no escape for the external force generated when the towing work machine A travels on the undulating ground, and an unreasonable load is applied to the connecting portions of the two connecting members e and f, the drawpa i, and the like. It may act and cause deformation and damage.

The engagement between the recess c1 of the upper hitch metal fitting b1 and the upper engagement pin d1 and the recess c2 of the lower hitch metal fitting b2 and the lower engagement pin d2
Must be performed at the same time, and precision is required in the operation of bringing the recesses c1 and c2 of the hitch metal fittings b1 and b2 closer to the upper and lower engaging pins d1 and d2 in this engaging operation. And

An object of the present invention is to provide a device for connecting a tractor to a tractor of a towing work machine, which has been devised in view of these problems.

[Means for Solving the Problems] The present invention is directed to a link frame provided on a three-point link of a tractor, and an upper engaging member and a lower portion having engaging recesses provided at upper and lower portions of the link frame and appropriately opened. The engaging member, the lower pin that is locked in the engaging recess of the lower engaging member provided in the towing work machine, and the lower end is pivotally supported by the towing work machine via a pivot shaft in the vehicle width direction and is attached to the upper end. And a traction frame having an upper pin and appropriately tilted forward so that the upper pin is locked in the engaging recess of the upper engaging member prior to the locking of the lower pin by the ascent of the three-point frame. , A universal transmission shaft whose base end is connected to the PTO shaft of the tractor and whose front end is appropriately supported by the link frame via a bearing,
It is supported on the lower part of the towing frame via bearings, the output side is connected to the universal transmission shaft of the towing work machine, and the towing frame swings forward around the upper pins as the three-point link continues to rise, so that input And a universal shaft joint whose side is connected to the tip of the universal transmission shaft of the tractor. The lower pin and the pivot shaft are preferably arranged on the same axis.

[Operation] With the above configuration, when the tractor is retracted to approach the towing work machine and the three-point link is raised, first, the upper engaging member provided on the upper portion of the link frame is provided on the upper end of the towing frame. Lock the pin. Then, when the three-point link continues to rise, the traction frame swings in the direction approaching the tractor side about the upper pin as the center of rotation, and the input side of the universal shaft coupling and the tip of the universal transmission shaft of the tractor are connected. At the same time, the lower engaging member of the link frame locks the lower pin of the towing work machine. As a result, the tractor and the towing work machine are connected to each other so that they can be towed and the power can be transmitted.

[Embodiment] A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

1 and 2 show a side view of a coupling device for a tractor according to the present invention.

The linking device to the tractor of the towing work machine is mainly composed of a link frame 1 and a towing frame 2.

As shown in FIG. 1 and FIG. 2, the link frame 1 has an engaging recess 4 formed at an upper center portion thereof and appropriately opened upward.
The top bracket 3 is fixedly provided as an upper engaging member having the above, and the lower engaging member 5 having the engaging concave portions 6 is fixedly provided at both left and right ends of the lower portion thereof. The engagement concave portion 6 is formed by cutting out the lower engagement member 5 side of the towing work machine A in an L-shape from the edge. A support shaft 7 is provided at an end of the lower engagement member 5 on the side of the towing work machine A so as to project outward in the vehicle width direction, and a base end of the support shaft 7 is rotatably fitted to the support shaft 7. Hook 8 is attached. A locking pin 9 is provided on the other end side of the hook 8 so as to be freely inserted and removed. The lower engaging member 5 has a tractor T
A locking hole 10 for freely engaging the engaging pin 9 is formed at the side position and the position on the turning locus of the hook 8. A tension coil spring 11 is provided so as to bridge the portion of the hook 8 between the engagement pin 9 and the support shaft 7 and the lower engagement member 5. The tension coil spring 11 applies an elastic force to the hook 8 in the locking direction (locking direction) until the turning position of the hook 8 exceeds the top dead center of the hook 8 and the hook 8 moves. When the upper dead center is exceeded, the hook 8 is attached so as to exert an elastic force in the unlocking direction. A lower link pin 12 is provided on the lower engaging member 5 so as to project outward in the vehicle width direction. The lower link pin 12 is fitted to the lower link 13 of the tractor T. The top bracket 3 is a top link pin on the top link 15 of the tractor T.
It is connected by 14. The lower link 13 and the top link 15 compose the three-point link.

A vertical member (not shown) is attached to the center of the lower portion of the link frame 1, and a tip portion (yoke) 16 of the universal transmission shaft 18 is mounted on the vertical member as a bearing (not shown).
Is supported through. This bearing is provided so as to be rotatable about a horizontal axis in the vehicle width direction within an appropriate range. The tip 16 has a spline hole along its axis.
17 are formed. The base end of the universal transmission shaft 18 is connected to the PTO shaft 19 of the tractor T.

Note that the towing work machine A is represented by, for example, a compost spreader in which a load box 21 is provided on a frame 20 configured to be freely movable, a floor conveyor is provided at a front portion thereof, and a beater is rotatably attached at a rear portion thereof. .

According to the present invention, a projecting portion 22 is attached to the frame 20 of the towing work machine A so as to project in the towing direction, and a drawbar 24 is rotatably connected to a tractor side end of the projecting portion 22 by a connecting pin 23. There is. As shown in FIG. 4, a lateral member 25 is suspended and fixed to the end of the drawbar 24 on the tractor side. Two pivot brackets 26, 26 are integrally attached to the center of the lateral member 25 with a space therebetween. Both lower ends of the arch-shaped tow frame 2 are rotatably attached to a pivot shaft 27 provided in the pivot brackets 26 in the vehicle width direction. Further, the tow frame 2 is provided with a tension coil spring 51 for biasing the upper end of the tow frame 2 so as to incline forward appropriately. Also the horizontal member 25
Is a stopper 28 for restricting the forward tilt angle of the frame 2.
Although the stopper 28 is attached, it is preferable that the stopper 28 is also provided on the rearward inclination side of the frame 2 so as to regulate the rearward inclination angle of the frame 2 as well. On the other hand, the tow frame 2 has a bracket portion 29 formed on the upper portion thereof and bent forward in the pulling direction, and a pin 30 with which the engaging recess 4 is engaged is integrally attached to the head of the bracket portion 29. There is. A vertical member 31 is provided below the tow frame 2, and the vertical member 31 is provided.
A bearing 32 whose axis is in a direction perpendicular to the traction frame 2 is attached to the. A universal transmission shaft 33 is connected to the input shaft 34 of the towing work machine A, and an intermediate shaft 35 as a free shaft joint is flexibly connected to the tip end portion thereof.
The intermediate shaft 35 is formed in the shaft center of the bearing 32 and has a shaft hole.
It is fitted to 36 so that it can be engaged and disengaged. Reference numeral 37 denotes a bracket fixedly provided on the outer end portion of the lateral member 25, and integrally formed with lower pins 38 and 38 that are engaged with the engaging recesses 6 of the lower engaging portion 5, respectively. Has been done. Stand lateral pivot brackets 39, 39 are provided on the lower surfaces of the lateral members 25 on the left and right end sides. The stand pivot brackets 39, 39 are provided with pivot shafts 42, and the stand pivot brackets 39, 39 are provided. , 39 pivots 4
Stands 41 and 41A are foldably and pivotally supported at 0.
In the present invention, in order to operate these stands 41, 41A from the seat of the tractor T so that they can be freely folded, FIG.
As shown in FIG. 4, the lever pivot bracket 42 is fixedly provided on the upper surface of the lateral member 25.
A lever 44 is manually rotatably provided on a pivot shaft 43 of the lever so as to be movable back and forth, and a connecting rod 47 having a ball socket 45 at both ends is provided on the right end 41A and the other end which is the action point side of the lever 44. Are hung around. The means for folding the stands 41, 41A is not limited to the connecting rod 47 having the ball socket 45, and another mechanism or connecting mechanism may be used. The power transmission mechanism provided in the link frame 1 and the traction frame 2 may be constituted by a clutch joint such as a claw clutch or a dog clutch.

 Next, the operation of the embodiment will be described.

When connecting the towing work machine A and the link frame 1, as shown in FIG. 1, first, the stands 41, 41A are made to support the work machine A in advance by operating the lever, and the lower link 13 is lowered. Keep it. Next, the tractor T is gradually retracted, and the tractor T is stopped at the retracted position where the engagement recess 4 can be engaged with the pin 30 of the bracket portion 29. After the stop, the lower link 13 is rotated upward to raise the link frame, and the pin 30 is engaged with the engaging concave portion 4 to scoop up the pin 30. Since the stands 41, 41A are separated from the ground by this scooping operation, the levers 44 are operated here to fold the stands 41, 41A so that the tow work machine can travel. Then, the lower link 13 is further raised from the above-mentioned scooping position. Due to this rise, the link frame 1 gradually pulls the towing frame 2 toward the tractor approaching side with the pin 30 as the center of rotation to move the towing work machine A to the tractor side, and the intermediate shaft 35 in the forward leaning posture is splined. The bearing of the tip portion 16 rotates around the horizontal axis by the action of coming into contact with the portion 17 and trying to be meshed with the portion 17, and is fitted smoothly.
At the same time as this fitting, the lower pin 38 is attached to the lower engaging portion 5.
It is locked in the engaging recess 6 of. At this time, hook 8 is pin 38
Is rotated against the urging force of the tension coil spring 11, and at the rotation position beyond the top dead center of the hook 8, the tension coil spring 11 forcibly rotates it to the lock position.
Lock. In this way, the present invention is the link frame 1
The traction frame 2 is connected to the link frame 1 and the tractor side universal transmission shaft 18 and the traction work machine side universal are simultaneously operated by simply retracting the tractor T equipped with the tractor T and scooping up the traction frame 2 by operating the lower link 13. Since the transmission shaft 33 is also connected, the connection operation can be performed quickly and easily. Further, the operation of separating the towing work machine A and the tractor T can be performed quickly and simply by lowering the link frame 1 by lowering the lower link 13 and slightly moving the tractor T forward.

FIG. 5 shows an example in which the lock and unlock of the pin 38 can be operated from the seat. That is, the lower engaging member 5 is provided with the pin shaft 48,
A hook 49 is rotatably provided on the 48, and a hook operating lever 50 that can be operated from the seat is attached to the hook 49.

Therefore, unlike the prior art, the present invention is different from the conventional technique in which the spline shafts arranged at a certain interval are slidably moved by the lever operation, and the lower link 13 is simply moved up and down. The tractor T and the towing work machine A can be automatically connected and disconnected by simply performing
Since the intermediate shaft 35 can be freely bent during towing and protection from an unreasonable load, operability, durability and reliability can be significantly improved compared to the conventional technology.

In the above embodiment, as shown in FIGS. 1 and 2, the pivot shaft 27 and the pin 38 are spaced apart from each other by a gap (play) between the engaging recess 4 and the pin 30. Although it is configured to allow the swinging of the towing work machine A to some extent, it is possible to position the pivot shaft 27 and the lower pin 38 on the same axis as shown in FIG. , When the traveling surface is uneven, that is, the tractor T and the towing work machine A.
When and are no longer horizontal when viewed from the side, the connected state can be maintained without being affected by the bending angle, and the vehicle can travel freely even in a field or the like where the ups and downs change greatly.

Therefore, the fertilizer spreader can be disconnected after completing the spraying of all fertilizer loaded on the fertilizer spreader, and the fertilizer spreader can be loaded with fertilizer on the fertilizer spreader with the front loader of the tractor. .

Incidentally, in the above-described embodiment, in order to tilt the traction frame 1 and the tractor T to the side, the tension coil spring 50 is stretched over the traction frame 2 and the lateral member 25 as shown in FIG. Although the tension coil spring 51 is suspended, the tension coil spring 51 is not limited to the tension coil spring 51, and another biasing means such as a weight may be provided. Of course, it is possible to adjust the center of gravity so as to be inclined to.

[Effects of the Invention] As is apparent from the above description, according to the present invention, when the towing work machine is connected to the tractor, the tractor equipped with the link frame is retracted and the towing frame is scooped by operating the lower link. The pulling frame is connected to the link frame and the tractor-side universal transmission shaft and the work implement-side input shaft are connected at the same time by simply raising the connection, so that the connecting operation can be performed quickly and easily. Further, the separating operation of the towing work machine and the tractor can be performed quickly and simply by simply lowering the link frame and slightly advancing the tractor by operating the rowanque.

[Brief description of drawings]

1 and 2 are side views showing a coupling device of a towing work machine to a tractor according to the present invention, and FIG. 3 is a III-III of FIG.
Fig. 4 is a side view showing an embodiment in which the hook can be operated from the seat, and Fig. 6 is a side view showing the conventional technique. It is a figure. In the figure, 1 is a link frame, 2 is a traction frame, 4 is an engaging recess, 18 is a universal transmission shaft, 33 is a universal transmission shaft, and 35 is a universal shaft joint.

Claims (2)

[Scope of utility model registration request] 1. A link frame provided on a three-point link of a tractor, an upper engaging member and a lower engaging member having engaging recesses provided at an upper portion and a lower portion of the link frame and appropriately opened, and a towing operation. A lower pin provided on the machine and locked in an engagement recess of the lower engaging member, and a lower end pivotally supported by the towing work machine via a pivot shaft in the vehicle width direction and an upper pin at the upper end. A pulling frame appropriately tilted so that the upper pin is locked in the engaging recess of the upper engaging member prior to the locking of the lower pin by the ascent of the three-point frame; A universal transmission shaft whose base end is connected to the PTO shaft of the tractor and whose front end is appropriately supported by the link frame via a bearing; and a universal transmission shaft supported below the traction frame via a bearing, the output side of which is the traction work machine. Universal transmission shaft The universal joint is connected to the input side of the universal transmission shaft of the tractor by connecting the input shaft to the front end of the tractor by swinging the traction frame forward around the upper pin as the three-point link continues to move upward. A device for connecting a tractor to a tractor of a towing work machine. 2. The connecting device for a tractor of a towing work machine according to claim 1, wherein the lower pin and the pivot shaft are arranged on the same axis.