JPH0618481B2 - How to connect the tractor and work implement - Google Patents

Description

The present invention relates to a method for connecting a tractor and a working machine.

(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 upper center of the working machine, for example, the left and right connecting pins of the lower side with the pair of left and right fitting portions of the rotary device, respectively, so as to be disengageable from the rear of the tractor. There is a connecting device for connecting a rotary device so that it can be moved up and down (see, for example, Japanese Utility Model Laid-Open No. 61-34813).

(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 object is to prevent the rattling of the connecting pin in the connected state as well as the fitting.

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

That is, the feature of the method of connecting the tractor and the working machine of the present invention is to insert the pulling hook provided in the top link of the three-point link mechanism into the lower side of the upper engaging portion of the working machine,
By raising the top link, the work machine is maintained in a grounded state and pulled toward the tractor side, and the connection pin connects the connection pin provided at the bottom of the three-point link mechanism and the lower fitting portion of the work machine. It is in.

(Operation) According to the present invention, since the working machine maintains the grounded state and approaches the tractor side in the parallel state, the connection pin and the lower fitting portion are smoothly connected.

(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 cylindrical body 11 as shown in FIGS. 1 and 3,
It has a screw shaft 12 screwed thereto.

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 expand and contract and bend.

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 shaft 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 a stopper 30 by means of a spring 30 provided between a pin 28 fixed to the engagement tool 24 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 end 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.
A ball joint portion 33 at the rear end of the lower link 8 is connected to the inner side of the, and a cylindrical body 35 having a circumferential groove 34 on the outer side is rotatably fitted.

A rotary device 36 is provided with a cultivating part (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, and a gauge wheel support rod 39 is used for adjusting the working depth. Adjustable up and down by 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. The first engaging portion 46a engages with the stopper 23 in the connected state, and
The engaging member 24 is engaged with the engaging portion 46b in a disengageable manner from above with the first engaging portion 46a in contact with the stopper 23.

Each support arm 42 of the rotary machine body 37 has a connecting bracket so as to project forward at a position corresponding to the outside of the lower bracket 16 of the connecting frame 13 as shown in FIGS.
47 is stuck. A guide portion 48 that bends outward is provided at the front end of the connecting bracket 47, and a fitting portion that is notched so that the front end side is open and is recessed rearward.
49 is provided, and the connecting pin 32 engages with the fitting portion 49 so as to be freely fitted and removed from the front side. The upper and lower edges 49a and 49b of the fitting portion 49 are substantially parallel to each other as shown in FIG.
Is approximately the same as the outer diameter of the connecting pin 32 so that the connecting pin 32 does not rattle up and down, and the innermost portion of the fitting portion 49 is formed in an arc shape along the shape of the connecting pin 32. . On the outer side of the connecting bracket 47, a pair of plate members 50, 5 are provided above and below the fitting portion 49.
1 is fixed, and a lock pin 52 that locks the connecting pin 32 engaged with the fitting portion 49 so that it cannot 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 sensing body 55 is attached to the connecting bracket 47 with the pin 56 below the plate body 50, and when the connecting pin 32 enters the fitting portion 49, it is sensed to unlock the lock pin 52. It has become.

Reference numeral 57 is a pulling hook, which is formed in a substantially arc shape centering on the pivot 22 and is attached to the top link 7 via a support plate 58, and is inserted below the first engaging portion 46a 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 support plate 58 includes a pair of left and right brackets 59 that sandwich the tubular body 11 of the top link 7 with a gap, and a ball joint 21.
Each of them has a pair of left and right brackets 60 for sandwiching, and a pin 61 is inserted in the former bracket 59 so as to sandwich the tubular body 11 from above and below with the support plate 58, and the latter bracket 60 has a spherical shape. Upper bracket by pivot 22 with joint 21
It is pivotally attached to 15. Therefore, the pulling hook 57 can swing left and right relatively to the top link 7 within a range permitted by the ball joint portion 21 and the bracket 59, and can be attached to and removed from the top link 7 by inserting and removing the pivot 22 and the pin 61. It is removable.

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.

Further, 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, the tubular body 35 may be extended to the vicinity of the lower bracket 16 so that the connecting pin 32 enters the fitting portion 49 via the tubular body 35.

Next, a connecting method using the device 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. 8, the connecting bracket 47 is inclined forward and downward, and the engaging portions 46a and 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 is rotated around the pivot 61 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 is moved.
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 46 a contacts 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 and engages with the circumferential groove 34 of the tubular body 35 of the connecting pin 32. Connecting pin 32
Is locked so that it cannot be extracted.

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.

In the connected state, since the upper and lower edges 49a and 49b of the fitting portion 49 are substantially parallel to each other, the vertical rattling of the connecting pin 32 in the fitting portion 49 is minimized, and the rattling of the rotary device 36 is suppressed. It can be prevented.

(Effect of the Invention) According to the present invention, since the working machine is pulled in parallel, the connecting work of the working machine is smooth, and the upper and lower edges of the lower fitting portion are substantially parallel to each other as compared with the conventional arc-moving machine. Therefore, it is possible to prevent looseness at the time of fitting.

[Brief description of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is a cutaway side view of a coupling device, Fig. 2 is a rear view of the same section, Fig. 3 is a plan view of a top link portion, and Fig. 4 is a lower link portion. FIG. 5 is a plan view, FIG. 5 is a side view of an upper portion of the coupling device, FIG. 6 is a side view of the whole, FIG. 7 is a side view of a fitting portion, and FIG. 1 ... tractor, 6 ... three-point link mechanism, 7 ... top link, 8 ... lower link, 13 ... connecting frame, 24 ... engaging tool, 32 ... connecting pin, 36 ... rotary device ( Work machine),
46a, 46b ...... Engagement part, 47 ...... Connection bracket, 49 ...... Fitting part, 49a, 49b ...... Upper and lower edges, 52 ...... Lock pin, 57 ......
Pull-in hook, 58 ... Support plate.

Claims (1)

[Claims] 1. A pulling hook provided on a top link of a three-point link mechanism is inserted below an upper engaging portion of a working machine, and the top link is raised to bring the working machine into a grounded state. A method of connecting a tractor and a working machine, characterized in that the tractor and the working machine are maintained and pulled toward the tractor, and the connecting pin provided at a lower portion of the three-point link mechanism and the lower fitting portion of the working machine are connected by the pulling.