JPH0691762B2 - Tractor work equipment coupling device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a work implement connecting device for a tractor.

(Prior Art) A connecting frame is attached to the rear end of a three-point link mechanism composed of a top link pivotally attached to the rear part of a tractor and a pair of left and right lower links, and a hook-like engagement is provided at the upper center of the connecting frame. The fitting is detachably engaged with the engaging portion at the center upper portion of the working machine, for example, the left and right pair of connecting pins on the lower side with the pair of left and right fitting portions of the rotary device, respectively, so as to be detachable from the rear of the tractor. There is a connecting device for connecting the rotary device so that it can be moved up and down (for example, Japanese Utility Model Publication No. 61-34813 and Japanese Utility Model Publication No. 62-136).
(See Japanese Patent No. 105).

(Problems to be Solved by the Invention) In this type of coupling device, when a rotary device is coupled,
After engaging the engaging tool with the engaging portion of the rotary device, the hydraulic device of the tractor raises the three-point link mechanism, and at this time, the rotary motion of the rotary device side around the engaging portion causes the pair of left and right parts to move. Since the connecting pin is fitted in the fitting portion, the connecting pin fits unless the fitting portion is formed into a V-shape with an open tip or is formed in an arc shape centering on the engaging portion. There was a problem that the parts did not fit smoothly.

In view of such conventional problems, the present invention uses the movement of the top link to pull the work implement toward the tractor side when the three-point link mechanism is raised, so that the connecting pin smoothly moves to the fitting portion. The purpose is to be fitted.

(Means for Solving the Problems) In order to achieve the above object, the present invention takes the following means.

That is, a feature of the tractor working machine connecting device of the present invention is that the connecting frame mounted on each rear end portion of the top link pivotally attached to the tractor so as to be vertically rotatable and a pair of left and right lower links. And is provided on the top link and protrudes rearward, and is inserted below the upper engagement portion on the working machine side when the tractor and the working machine approach each other, and on the upper engagement portion when the top link rises. A pulling hook that is engaged with the movable machine to maintain the grounding state of the work machine and draws the work machine to the tractor side; and a lower fitting of the work machine side that is provided on the lower side of the connecting frame and is pulled when the work machine is drawn. It is provided with a pair of left and right connecting pins that are detachably engaged with the mating portion.

(Operation) According to the present invention, the operation of connecting the work implement to the tractor is as follows.

The tractor is arranged so that the connecting frame at the rear of the tractor faces the upper engaging portion and the lower fitting portion of the working machine. Then, the tractor is retracted and the tractor and the work implement are brought closer to each other. At this time, the height of the top link is maintained so that the pulling hook has a height to be inserted below the upper engaging portion on the working machine side.

When the pulling hook is inserted under the upper engaging portion, the retracting of the tractor is stopped and the top link is rotated upward. By the upward rotation of the top link, the pulling hook is engaged with the upper engaging portion. When the top link is further rotated upward, the upper engagement portion and the pulling hook relatively move, and the working machine maintains the grounded state and approaches the tractor side.

Then, due to this approach, the pair of left and right connecting pins provided on the lower side of the connecting frame and the lower fitting portion on the working machine side approach and engage with each other.

(Example) Hereinafter, the present invention will be described in detail with reference to the illustrated example.
In the figure, 1 is a tractor, 2 is a driver's seat, 3 is a rear wheel, 4
Is a hydraulic device having a pair of left and right lift arms 5. 6
Is a three-point link mechanism and is composed of a top link 7 and a pair of left and right lower links 8. The top link 7 is pivotally attached to the top link bracket 9 of the tractor 1 and the lower link 8
Is pivotally attached to both lower sides of the tractor 1 and is also connected to a lift arm 5 via a lift rod 10. The top link 7 has a tubular body 11 and a screw shaft 12 screwed to the tubular body 11.

A connecting frame 13 is attached to the rear end of the three-point link mechanism 6, and has a connecting rod 14 having a mountain shape in a front view as shown in FIGS.
It has an upper bracket 15 having an inverted U-shape in a front view, which is fixed to an upper center of the connecting rod 14, and a pair of left and right lower brackets 16 fixed to both left and right ends of the connecting rod 14. A shaft connecting device 18 is attached to the connecting rod 14 via a bracket 17, and the shaft connecting device 18 is connected to a PTO shaft 20 of the tractor 1 via a flexible joint shaft 19 which can freely expand and contract.

The upper bracket 15 has a ball joint at the rear end of the top link 7.
21 is pivotally attached via a pivot 22, and a stopper 23 is fixed to the back side. A hook-shaped engaging member 24 is rotatably fitted on one end of the pivot member 22.
Has a lever 25 and is rotatable between stopper pins 26, 27 fixed to the upper bracket 15. Further, as shown in FIG. 2 and FIG. 5, the engagement tool 24 is provided with each stopper pin 26 by means of a spring 30 hooked between a fixed pin 28 and a spring hook 29 at the tip of the stopper pin 27. , 27 are urged to engage in unstable switching.

The lower bracket 16 is attached to the connecting rod 14 so as to stand upright.The lower bracket 16 is provided with a guide portion 31 at the rear edge and a connecting pin 32 on the front side of the guide portion 31. There is. The connecting pin 32 is fixed by penetrating left and right through the lower bracket 16.
The ball joint 33 at the rear end of the lower link 8 is connected to the inner side of the
A cylindrical body 35 having a circumferential groove 34 is rotatably fitted on the outer side.

Reference numeral 36 denotes a rotary device, which is provided with a cultivating portion (cultivating claw) 38 at the lower part of the rotary machine body 37, and a gauge wheel 40 at the rear end of the gauge wheel support rod 39 protruding rearward from the rotary machine body 37. As shown in FIG. 1, the rotary machine body 37 is provided with support arms 42 on both left and right sides of an input gear case 41, a top mast 43, a support link 44, and the like.
The gauge wheel support rod 39 can be adjusted up and down by a tilling depth adjusting device 45. As shown in FIGS. 1 and 3, a cylindrical first engaging portion 46a is provided at the upper end of the top mast 43, and a pin-shaped first engaging portion 46a inserted into and fixed to the first engaging portion 46a. Two engaging portions 46b are provided so as to project laterally. First engaging portion 46a
Is engaged with the stopper 23 in the connected state, and the second engaging portion
The engagement tool 24 is engaged with the 46b so as to be disengageable from above in a state where the first engagement portion 46a is in contact with the stopper 23.

As shown in FIGS. 1 and 4, a connecting bracket 47 is fixed to each support arm 42 of the rotary body 37 so as to project forward at a position corresponding to the outside of the lower bracket 16 of the connecting frame 13. There is. A guide portion 48 that bends outward is provided at the front end of the connecting bracket 47, and a fitting portion 49 that is formed so as to be recessed rearward from the front end side is provided, and is connected to the fitting portion 49. The pin 32 engages in such a manner that it can be freely inserted and removed from the front. The upper and lower edges of the fitting portion 49 have substantially the same dimension as the outer diameter of the connecting pin 32, and the upper and lower edges are substantially parallel. On the outside of the connecting bracket 47, a pair of plate members 5 are provided above and below the fitting portion 49.
0 and 51 are fixed, and a lock pin 52 that locks the connecting pin 32 engaged with the fitting portion 49 so as not to be pulled out is provided on the plate bodies 50 and 51 so as to be vertically movable. The lock pin 52 is biased downward by a spring 54 in a cylindrical body 53 fixed on the plate body 50, and can be locked by a fitting sensor 55 in a state of being pulled up. The sensor 55 is pinned to the connecting bracket 47 below the plate 50.
It is attached at 56, and when the connecting pin 32 enters the fitting portion 49, it is sensed to release the lock of the lock pin 52.

57 is a pulling hook, which is formed in a substantially arc shape centering on the pivot 22 and is fixed to the screw shaft 12 of the top link 7, and is inserted into the first engaging portion 46a at the lower side at the time of connection. Is
When the top link 7 is raised in this state, the rotary device 36 is pulled forward through the first engaging portion 46a.

The shaft connecting device 18 is automatically connected to the input shaft protruding forward from the input gear case 41 when the rotary device 36 is connected.

The pulling hook 57 may be fixed to the screw shaft 12 of the top link 7, or may be attached to the top link 7 as shown in FIGS. 8 and 9. That is, the pulling hook 57 is a support plate.
The support plate 58 is fixed to 58, and the support plate 58 is pivotally attached to the pivot 22 via a pair of left and right brackets 59 that sandwich the ball joint portion 21, while the support plate 58 is L-shaped so as to sandwich the tubular body 11 from above and below. A character-shaped engaging portion 60 is provided.

Therefore, in this case, the pulling hook 57 and the top link 7 can swing within the range permitted by the ball joint portion 21, and the pulling hook 57 can be attached to and detached from the top link 7 by inserting and removing the pivot 22. Is.

The engagement tool 24 may be provided in the upper bracket 15, in which case the first engagement part 46a can also serve as the second engagement part 46b.

Further, extend the tubular body 35 toward the lower bracket 16 side, and connect the connecting pin.
The 32 may enter the fitting portion 49 via the tubular body 35.

Next, the operation at the time of connection in the above embodiment will be described.

The rotary device 36 is normally placed on the ground such that the gauge wheel 40 is lowered and the rotary body 37 is in a forward tilted posture. Therefore, as shown in FIG. 7, the connecting bracket 47 is inclined forward and downward, and the engaging portions 46a, 46b at the upper end of the top mast 43 are in a state of being largely projected forward.

Therefore, with the engagement tool 24 in an upright position, the pulling hook
After lowering the three-point link mechanism 6 to a height where the rear end of the 57 is inserted below the first engaging portion 46a, the tractor 1 is moved closer to the rotary device 36 side. Then, as shown in FIG.
Since the rear end of the pulling hook 57 is inserted below the first engaging portion 46a, the hydraulic device 4 is stopped after the tractor 1 is stopped in this state.
The lift arm 5 of the
Rotate upwards.

At this time, since the top link 7 rotates about the pivot 16 at the rear end of the top link bracket 9, the pulling hook 57 slides with respect to the first engaging portion 46a when the top link 7 rises, and the pulling hook 57
The rotary device 36 is pulled toward the front through the first engaging portion 46a on the upper surface side thereof while keeping the grounded state.

Therefore, the rotary device 36 moves forward, the connecting pin 32 enters the fitting portion 49, and the first engaging portion 46a comes into contact with the stopper 23. Then, the connecting pin 32 is attached to the fitting portion 49.
, The sensor 55 unlocks the lock pin 52 at the raised position, so that the lock pin 52 is lowered by the spring 54,
The connecting pin 32 is engaged with the circumferential groove 34 of the cylindrical body 35, and the connecting pin 32 is constrained so that it cannot be pulled out.

Next, the engagement tool 24 is rotated rearward against the spring 30 to engage the engagement tool 24 with the second engagement portion 46b. This completes the connection of the rotary device 36.

When removing the rotary device 36, the procedure described above may be reversed.

According to the above-described embodiment, the rotary device 36 is brought closer to the ground device while maintaining the grounded state instead of lifting and rotating the rotary device 36 side from the ground as in the prior art, and thus the collision is caused. The shock is reduced and smooth connection can be achieved. Further, since the rotary device 36 is not lifted from the ground as in the conventional case, the strength of the pulling hook 57 can be reduced and the structure is simplified.

(Effect of the Invention) According to the present invention, when the top link 7 is raised, the pulling hook 57 provided on the top link 7 pulls the work implement 36 toward the tractor 1 side via the engaging portion 46a. Therefore, the pair of left and right connecting pins 32 of the connecting frame 13 can be comfortably put in the fitting portion 49 on the working machine 1 side to be engaged.
36 can be connected smoothly and easily. That is, the work machine 36 is lifted from the ground as in the prior art and is not rotated to be joined to the work machine 36, but the work machine 36 is brought into contact with the work machine 36 in a grounded state, so that the shock of a collision at the time of joining is reduced, Can be smoothly combined. Further, unlike the conventional case, the working machine 36 is not lifted from the ground, so that the strength of the pulling hook 57 can be reduced and the structure is simplified.

[Brief description of drawings]

1 to 7 show an embodiment of the present invention. FIG. 1 is a cutaway side view of a connecting device, FIG. 2 is a rear view of the same section, FIG. 3 is a plan view of a top link portion, and FIG. FIG. 5 is a plan view of the lower link part, FIG. 5 is a side view of the upper part of the coupling device, FIG. 6 is a side view of the whole, FIG. 7 is an operation explanatory view, and FIG. 8 shows another embodiment. FIG. 9 is a side view and FIG. 9 is an enlarged view taken along the line AA of FIG. DESCRIPTION OF SYMBOLS 1 ... Tractor, 6 ... Three-point link mechanism, 7 ... Top link, 8 ... Lower link, 13 ... Connection frame, 24 ... Engaging tool, 32 ... Connection pin, 36 ... Rotary device (working machine), 46a, 46b ... Engaging portion, 47 ... Connection bracket, 49 ... Fitting portion, 52 ... Lock pin, 57 ... Pulling hook.

Claims (1)

[Claims] 1. A connecting frame (13) attached to each rear end portion of a top link (7) pivotally attached to a tractor (1) so as to be vertically rotatable and a pair of left and right lower links (8). Provided on the top link (7) so as to project rearward and be inserted below the upper engagement portion (46a) on the working machine (36) side when the tractor (1) and the working machine (36) approach each other. And when the top link (7) rises, the upper engaging portion (46)
The pulling hook (5) that engages with the a) so that the working machine (36) is kept in the grounded state and is pulled toward the tractor (1) side.
7) and a pair of left and right couplings provided on the lower side of the connecting frame (13) and detachably engaged with the lower fitting portion (49) on the working machine (36) side when the working machine is pulled. A work machine connecting device for a tractor, comprising a pin (32).