JPH0626482B2 - Coupling device for tractor and work equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a coupling device for a tractor and a working machine.

(Prior Art) When connecting a rotary tiller to the rear of the tractor via a three-point link mechanism consisting of a central top link and a pair of left and right lower links in a vertically movable and removable manner, this connecting work is performed. Technology that makes it easy to
It is disclosed in JP-A-60-259104.

In the above, the work link side ends of the top link and both lower links are connected by the connecting body, and the tiller is engaged with the upper part of the center portion in the left-right direction when the connecting body is raised so as to be disengageably engaged. An upper engaging portion and a pair of left and right lower engaging portions,
When the connecting body is further raised after engaging with the upper engaging portion, the working machine is rotated around the upper engaging portion toward the tractor side, and the left and right side portions of the connecting body are connected to the lower engaging portions. And a blocking device for releasably blocking the disengagement of the left and right side portions of the connecting body from the lower engaging portions.

Therefore, in the above, when connecting the tractor and the tiller, by moving the tractor backward and approaching the tiller side, the connector is raised and the connector is attached to the upper and lower engaging portions of the tiller. With the easy operation of blocking the disengagement from the lower engaging portion of the connecting body by engaging the engaging device,
There is an advantage that the three-point linkage can be connected to the tiller.

(Problems to be Solved by the Invention) However, in the above, no consideration is given to facilitating the connection between the PTO shaft of the tractor and the input shaft of the tiller, and an improvement in this respect is desired. Has been done.

An object of the present invention is to provide a connecting device for a tractor and a working machine that can solve the above problems.

(Means for Solving Problems) In order to solve the above problems, the means adopted by the present invention is to connect the connecting body 14 to the working machine side end of the three-point link mechanism 9 mounted on the tractor 1, Corresponding to the connecting body 14 and the working machine R respectively, the upper connecting portion and the connecting body 14 are engaged with the upper engaging portion.
In the connecting device of the tractor and the working machine provided with a pair of left and right lower engaging portions with which the working machine R approaches and engages by moving up, the connecting body 14 is located at a position substantially corresponding to the working machine input shaft 29. The equipment body 31 that is pivotally supported via the left-right direction support shaft 98, a neutral means that elastically holds the equipment body 31 in a neutral position of the rotation range, and a movable tube that is arranged in the equipment body 31 so as to be movable back and forth. 32 and
A connecting shaft 49 supported in the movable barrel 32 and connected to the PTO shaft 8 of the tractor 1 and connectable to the input shaft 29, and the equipment body 31 is rotated against the neutral means when the lower engaging portion is engaged. Positioning means for moving the connecting shaft 49 so that the shaft center of the connecting shaft 49 corresponds to the input shaft 29, and operating device 33 for moving the movable cylinder 32 to move the connecting shaft 49 from the separated position to the connected position with respect to the input shaft 29. It is in the point of being prepared.

(Operation) When the working machine R is connected to the tractor 1, the connecting body 14 is lifted by the elevating device 3 so that the connecting body 14 engages with the upper and lower engaging portions 88 and 89 of the working machine R to prevent them. Device 92 allows connection 14
Disengagement from the upper and lower engaging portions 88 and 89 is prevented.

When the connecting body 14 and the upper / lower engaging portions 88 and 89 are engaged, the equipment body 31 of the clutch device 28 is held in a neutral position with respect to the support shaft 98 in the left-right direction, and the positioning means acts. As a result, the equipment body 31 is rotated, and the shaft center of the connecting shaft 49 that interlocks with the PTO shaft 8 and the input shaft 29 of the working machine R are made to correspond to each other.

Next, the movable cylinder 32 is moved via the operating device 33 to move the connecting shaft.
When the position of 49 is changed from the separated position to the connecting position with respect to the input shaft 29, the connecting shaft 49 is connected to the input shaft 29.

(Embodiment) Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.
In FIG. 4, 1 is a tractor, 2 is a tractor vehicle body, 3
Is a hydraulic device for raising and lowering a working machine, which is exemplified as a lifting device mounted on the rear portion of the tractor body 2, and has a pair of left and right lift arms 4. 5 is a seat, 6 is a rear wheel, 8 is a PTO axis,
It projects rearward from the rear end of the vehicle body 2. A cover 7 covers the PTO shaft 8.

R is a side drive type rotary tiller which is exemplified as a working machine, and is connected to the rear of the tractor 1 via a three-point link mechanism 9 so as to be vertically movable and detachable.

The three-point link mechanism 9 mounted on the tractor 1 is composed of a central top link 10 and a pair of left and right lower links 11. Each lower link 11 and each lift arm 4 is a lift rod.
Connected by 12.

As shown in FIGS. 1 to 3, reference numeral 14 denotes a connecting body which connects the work machine side end portions of the top link 10 and both lower links 11, that is, the rear end portions, and projects upward. A cylindrical main body 15 having a mountain shape in a front view, and a pair of left and right side plates projecting obliquely upward and rearward from an upper end portion of a central portion in the left-right direction of the main body 15.
16, a pair of left and right cylinders 17 arranged in the left and right direction on both left and right ends of the main body 15, and left and right protruding from the outer end of each cylinder 17 to the outside and having a smaller diameter than the cylinder 17. It is composed of a pair of connecting shafts (lower engaging portions) 18 and the like.

A ball joint portion 20 at the rear end of the top link 10 is detachably connected by a mounting pin 21 between the front portions of the left and right side plates 16. A notch (upper engagement part) 22 that opens obliquely upward and rearward is formed in the rear part of each side plate 16, and the upper part of the notch 22 gradually expands toward the upper end.

At the outer end of each cylinder 17, a hollow truncated cone-shaped side guide is provided.
23 is externally fitted and fixed with the small-diameter end surface facing outward.

A peripheral groove 24 is formed on the inner side of each connecting shaft 18, and a ball joint 25 of each lower link 11 is detachably fitted on the outer side of the connecting shaft 18 and is secured by a pin 26.

28 is a clutch device for releasably connecting the PTO shaft 8 of the tractor 1 and the input shaft 29 of the tiller R.
A device cylinder 31 located below the center of the connecting body 14 in the left-right direction and illustrated as an equipment body as shown in FIGS. 5 to 11.
And a movable barrel 32, an operating device 33 for the movable barrel 32, and the like.

The equipment cylinder 31 is arranged in the front-rear direction and is inclined forward and downward, and the lower portions of the left and right side portions of the rear portion of the equipment cylinder 31 are rotatably supported around the support shaft 98 in the left and right directions. Prepared for 34. The support member 34 is fixed to the cylindrical body 17. A pair of left and right guide grooves 35 are cut out in the axial direction from the rear end toward the front in the center part in the up-down direction on both the left and right sides of the equipment cylinder 31. A spring receiving ring 36 that projects radially inward is fixed to the front end of the equipment cylinder 31. A positioning body 99, which is an L-shaped plate, is provided to project outward from the lower part on the left and right sides of the rear part of the equipment cylinder 31, and the tip of the positioning body 99 projects rearward.

In addition, a U-shaped spring receiving body 100 that is externally fitted to the positioning body 99 is fixed to the support member 34 on one side.
Between the upper and lower walls and the positioning body 99, a pair of upper and lower springs
101 is elastically inserted, and the elastic force of the spring 101 keeps the equipment cylinder 31 in the neutral position of the rotation range, and the positioning body 99, the upper and lower springs 101, etc. constitute neutral means. ing.

The movable cylinder 32 is arranged concentrically in the equipment cylinder 31, and includes an outer cylinder body 37, an inner cylinder body 38 arranged concentrically in the rear side of the outer cylinder body 37, and both cylinder bodies. Front / rear mounting pieces 39, 40 connecting 37, 38
And so on.

A pair of left and right horizontal shafts 41 project outward from the rear end of the inner tubular body 38 and are inserted in the guide grooves 35 of the equipment barrel 31 so as to be movable in the longitudinal direction and relatively rotatable. Accordingly, the movable cylinder 32 is provided in the equipment cylinder 31 so as to be movable in the axial direction and rotatable about the horizontal shaft 41. Also, the horizontal shaft 41 and the guide groove 35
Due to the gap, the movable cylinder 32 is rotatable at the rear end portion around the vertical axis orthogonal to the horizontal axis 41 with respect to the equipment cylinder 31 due to the gap between the equipment cylinder 31 and the movable cylinder 32. At the same time, the movable barrel 32 is movable in parallel in any radial direction.

A stopper 42, which is an example of a retaining ring, is provided on the inner surface of the rear end of the equipment cylinder 31, and when the stopper 42 and the horizontal shaft 41 come into contact with each other, the movable cylinder 32 has a predetermined size or more with respect to the equipment cylinder 31. Is restricted from moving backwards.

The front and rear mounting pieces 39, 40 are plural at equal intervals in the circumferential direction, for example, 3
The rear mounting piece 40 is provided in a number of more than one, and projects more radially than the outer cylindrical body 37.

Then, the rear mounting piece 40 contacts the inner surface of the equipment cylinder 31, and the blade receiving ring 36 contacts the outer surface of the outer cylinder body 37, so that the movable cylinder
The parallel movement of 32 in the radial direction more than a predetermined amount is prevented.

By the way, the PTO shaft 8 of the tractor 1 and the input shaft 29 of the tiller R can be released through the transmission shaft 44 and the front / rear universal joints 45, 45 provided at both ends of the transmission shaft 44. Is linked to.

The transmission shaft 44 is composed of a tubular body 46 constituting the front side thereof and a shaft body 47 slidably spline-coupled to the tubular body 46 constituting the front side of the rear portion thereof, and is made expandable and contractable. 43 is the transmission shaft
It is a cover that covers 44.

The rear universal joint 45 includes front and rear yokes 48 and 49, and both yokes 48 and 49.
The front yoke 48 is releasably connected to the shaft body 47 of the transmission shaft 44.

The rear yoke 49 is a connecting shaft that is releasably connected to the input shaft 29, and the rear portion of the rear yoke 49 is an inner cylinder body of the movable cylinder 32.
It is supported by 38 via a bearing 51. A female spline portion 53 is formed on the inner surface of the rear portion of the rear yoke 49 so as to be spline-fitted with the male spline portion 52 of the input shaft 29. On the inner surface of the rear end of the rear yoke 49, a female spline portion
Behind 53, a smooth surface 54 and a tapered surface 55 that is tapered toward the front are provided continuously toward the rear.

The operating device 33 for the movable barrel 32 moves the movable barrel 32 in the axial direction with respect to the equipment barrel 31, and the movable barrel 32 is largely projected forward from the equipment barrel 31, as shown in FIG. As shown in FIG. 10, the front side holding position, that is, the separation position where the rear yoke 49 inside the movable cylinder 32 is separated from the input shaft 29, and the rear side holding position that is housed in the equipment cylinder 31, that is, the rear yoke. 49 is the input shaft 29
The coil spring 57, the position changing body 58 for the left and right pairs, the holding body 59, the biasing spring 60, and the interlocking mechanism 61. It has first and second interlocking bodies 62 and 63, and a single operation lever 64.

The coil spring 57 is wound around the outer peripheral surface of the outer cylinder body 37 of the movable cylinder 32, and is elastically interposed between the spring receiving ring 36 and the rear mounting piece 40 to move the movable cylinder 32 rearward, that is, the cultivating device. It is biased to the R side. The coil spring 57 does not have a constant diameter in the axial direction, and large diameter portions 65 and small diameter portions 66 are alternately arranged in the axial direction. The large diameter portion 65 is in contact with the inner peripheral surface of the equipment cylinder 31, and the small diameter portion 66 is in contact with the outer peripheral surface of the outer cylinder body 37 of the movable cylinder 32. As a result, the movable cylinder 32 is moved by the coil spring 57. It is held by 31 so as to be movable in any radial direction.

The coil spring 57 may have an intermediate diameter portion having an intermediate diameter in addition to the large / small diameter portions 65 and 66.

A pair of left and right brackets 67 are erected on the upper portions of the left and right sides of the outer peripheral surface of the equipment cylinder 31, and both the brackets 67 have a first cylindrical shape.
The interlocking body 62 is rotatably inserted around the axis.

The position changing bodies 58 are interlocked with each other by the first interlocking body 62, and are fixedly provided at respective end portions thereof and arranged outside the equipment cylinder 31. The position changing body 58 moves the movable tube 32 to the horizontal axis 41.
The position is changed to each holding position through the front and rear actuating parts 68 and 69 located on the front side or the rear side of the horizontal shaft 41 so as to project downward. There is.

Each holding body 59 is disposed between the equipment cylinder 31 and each position changing body 58, and the front end portion thereof is rotatably supported by the equipment cylinder 31 by a support shaft 70 in the left-right direction. The holding body 59 is a front / rear locking part.
By having the horizontal shaft 41 engageably and disengageably engaged with the front and rear engaging portions 71 and 72, the movable cylinder 32 is releasably held at the respective holding positions.

The second interlocking body 63 is formed by bending a rod into a U shape,
Externally fitted to the front part from above, each end is fixed to the front end of the holding body 59, and both holding bodies 59 are interlocked.

Each urging spring 60 is interposed between the rear end of each holding body 59 and the equipment cylinder 31 in a resilient manner, and urges each holding body 59 downward, that is, in the locking direction with respect to the horizontal shaft 41. .

Each interlocking mechanism 61 interlocks the position changing body 58 and the holding body 59 on each of the left and right sides, and after the horizontal shaft 41 is unlocked by the holding body 59, each operating portion 69 of the position changing body 58, The operation of the horizontal shaft 41 by the 69 is performed.The cam groove 73 is formed in a mountain shape on the lower side of the position changing body 58, and is protruded outward from the middle portion of the holding body 59 in the front-rear direction. And a cam pin 74 movably inserted in the cam groove 73.

The operating lever 64 operates the position changing body 58 and the holding body 59, and is provided so as to project upward from one side portion of the first interlocking body 62.

The cultivating device R includes an input case 76 located in the center of the front upper part in the left-right direction, a top mast 78 that is provided so as to project obliquely upward and forward from the input case 76 and that includes a pair of left and right side plates 77.
A pair of support arms 79 projecting from the input case 76 to the left and right sides, a pair of left and right brackets 80 projecting forward from the middle portion of each support arm 79 in the left-right direction, and upper ends of the side plates 77 of the top mast 78. Pair of left and right support links 81 that connect the front end portion of each bracket 80 to each of the brackets 80, a transmission case 82 and a side plate that are respectively provided below the outer end portions of each support arm 79, and lower ends of the transmission case 82 and the side plate. A cultivating part 83, which is horizontally rotatably driven between the parts and includes a cultivating shaft and a large number of cultivating claws provided on the cultivating part, a cultivating cover 84 covering the cultivating part 83, and a pair of left and right gauge wheels 85.
And a plowing depth adjusting mechanism 86 for raising and lowering the cage wheels 85.

An input shaft 29 protruding forward is rotatably supported on the input case 76 by bearings.

102 is a deformed U-shaped receiver, which is made of an elastic material such as spring steel and is attached to one side of the input case 76.
The positioning body 99 is removably inserted into the inside of the 2, so that the equipment cylinder 31 is positioned around the support shaft 98, and the rear yoke
The shaft centers of 49 and the input shaft 29 are matched and matched. By the positioning body 99 and the receiving body 102, the equipment cylinder against the neutral means
Positioning means is configured to rotate 31 to make the rear yoke 49 correspond to the input shaft 29.

As shown in FIG. 3, between the upper end portions of the side plates 77 of the top mast 78, an upper engaging portion 88 exemplified by a pin is provided in the left-right direction, and the upper engaging portion 88 of the connecting body 14 is provided. The notch 22 is engaged with the lower side so as to be freely disengaged.

As shown in FIG. 1 and FIG. 2, 89 is a pair of left and right lower engaging portions that are substantially U-shaped in a side view, and are fixed to the front portions of the brackets 80 so as to project forward. The connecting shafts 18 are engaged with each other in a disengageable manner.

Reference numeral 92 denotes a pair of left and right blocking devices, which are lower engaging portions of the connecting shaft bodies 18.
It is designed to prevent disengagement from the 89, and the lower engaging part 89
The equipment cylinder 93 erected on the upper wall portion of the equipment, the retaining pin 94 that is movably in the axial direction inside the equipment cylinder 93 and that appears in and out of the lower engaging portion 89, and is installed in the equipment cylinder 93. Urging spring for urging the retaining pin 94 downward, and the retaining pin 94 inserted into the lower engaging portion 89 pivotally supported by the bracket 80 and releasable to the position retracted from the inside of the lower engaging portion 89. And a holding plate 96 standing upright from the equipment cylinder 93, and the like.

The retaining pin 94 is releasably locked to the upper end of the holding plate 96 by being rotated at a position retracted from the inside of the lower engaging portion 89.

According to the embodiment configured as described above, when the cultivator R is connected to the tractor 1, the clutch device 28 holds the movable tube 32 in the separated position as shown in FIGS. 6 and 11. I'll do it.

In the above state, the movable cylinder 32 projects largely forward from the equipment cylinder 31, and the horizontal shaft 41 is located at the front end portion of the guide groove 35. or,
The position changing body 58 is at the front rotation position,
69 is in contact with the horizontal axis 41 or at a position slightly rearward thereof.

On the other hand, the cultivating device R is placed on the ground and is in a slightly forward leaning posture as shown in FIG. 2. In this cultivating device R, the blocking device 92 is retained and the pin 94 is attached. It is pulled out from the inside of the lower engaging portion 89 and held by the restricting body 95.

In this state, the tractor 1 is moved backward to approach the cultivating device R, and as shown in FIG. 2, under the upper and lower engaging portions 88 and 89 of the cultivating device R, the cutout portions of the connecting body 14 are formed. 22 and each connecting shaft
Position 18 respectively.

Next, the three-point link mechanism 9, the coupling body 14, and the clutch device 28.
Is gradually raised by the hydraulic device 3, and first, the connecting body 14
The upper engaging portion 88 is engaged in the notch portion 22, and in this state, each connecting shaft body 18 is located on the front side of each lower engaging portion 89.

Then, when the three-point link mechanism 9, the connecting body 14 and the clutch device 28 are further raised, the upper engaging portion 88 is engaged in the notch 22 of the connecting body 14, so that the three-point link is formed. By raising the mechanism 9 and the like, the tiller R is lifted and rotated around the upper engaging portion 88 toward the tractor 1 side, that is, toward the front side so as to approach the connecting body 14.

From this, as shown in FIG. 1, each connecting shaft body 18 is relatively fitted into and engaged with each lower engaging portion 89 from the front side to form the restricting body.
Each of the connecting shafts 18 is brought into contact with the 96, and the connecting shafts 18 rotate the restricting body 96 to the rear side so that the connecting shafts 18 engage with predetermined positions in the rear part of the lower engaging parts 89.

Further, the rotation of the restricting body 96 to the rear side releases the retention of the retaining pin 94, and the retaining pin 94 is moved downward by the biasing spring, and as shown in FIG. Circumferential groove 24 on body 18
To prevent the connecting shaft 18 from being disengaged from the lower engaging portion 89.

In the above case, even if the connecting shaft body 18 is deviated from the relative regular movement path, the outer surface of each side guide body 23 and each lower engagement portion 89 relatively slide, Connecting shaft 18
Has its position corrected to the normal path of travel.

By the way, when the connecting body 14 and the cultivating device R are connected, the cultivating device R is rotated around the upper engaging portion 88 toward the tractor 1 side, so that the cultivating device R is rotated as shown in FIGS. 6 and 11. The R input case 76 approaches the clutch device 28 from the rear side, the input shaft 29 enters the equipment cylinder 31 of the clutch device 28, and a small gap is formed between the rear yoke 49 and the rear universal joint 45, which is a connecting shaft. Oppose through.

In this case, the front end of the input shaft 29 is tapered by the tapered surface 55 of the rear yoke 49.
Alternatively, it may be fitted into the smooth surface 54.

By the way, in the above case, the input shaft 29 does not come into the equipment cylinder 31 from the rear in the axial direction, but rather the tiller R.
Is rotated forward around the upper engaging portion 88, and by the rotation around the rotation axis, the input shaft 29 enters the equipment cylinder 31, and the rear yoke 49 rear end portion of the rear universal joint 45. Since the shafts of the input shaft 29 and the rear yoke 49 are fitted to each other or face each other through a small gap, the shafts of the input shaft 29 and the rear yoke 49 may intersect each other unless there is a means for matching the shaft centers of the input shaft 29 and the rear yoke 49. Will be done.

However, in the embodiment, since the equipment cylinder 31 is provided with the positioning body 99 and the input case 76 is provided with the receiving body 102, respectively, when the tiller R rotates around the upper engaging portion 88 toward the tractor 1 side. ,
The positioning body 99 is relatively inserted into the receiving body 102, and the equipment cylinder 31 elastically held in the neutral position by the spring 101 of the neutral means, that is, the clutch device 28 is the support shaft in the left-right direction.
It is rotated around 98 and positioned at the normal position (posture that fits to the input shaft 29 by simply moving the rear yoke 49 in the axial direction), and the rear yoke 49 and the input shaft 29 are aligned with each other. .

Thus, from the above state, when connecting the rear yoke 49 to the input shaft 29, the driver on the seat 5 extends his / her hand rearward to rotate the operation lever 64 of the clutch device 28 forward. To do.

As a result, both position changing bodies 58 rotate rearward via the first interlocking body 62, and the cam pins 74 of each holding body 59 relatively move forward in the cam grooves 73 of each position changing body 58. As a result, the holding body 59 moves upward against the biasing spring 60, and the horizontal shaft 41 relatively separates downward from the front locking portion 71, as shown in FIG. At this time, the horizontal axis 41 is located at a substantially central portion between the front and rear operating portions 68 and 69 of the position changing body 58.

When the locking of the horizontal shaft 41 by the front locking portion 71 of the holding body 59 is released, the movable cylinder 32 is biased rearward by the coil spring 57. When the shaft 44 is extended, it moves rearward together with the horizontal shaft 41 and the rear yoke 49 of the rear universal joint 45, and as shown in FIGS.
And the female spline portion 53 of the rear yoke 49 is fitted onto the input shaft 29.
The male spline part 52 is fitted.

By the way, even after the locking of the horizontal shaft 41 by the front locking portion 71 of the holding body 59 is released, the operation lever 64 is rotated forward and the position changing body 58 reaches the position shown in FIG. The front operating portion 68 is rotated rearward, and the front operating portion 68 is at the connecting position.
It is located in contact with the horizontal axis 41 or slightly forward.

Further, the rotation of the position changing body 58 causes the cam pin 74 of the holding body 59 to move.
Moves relatively forward in the cam groove 73, whereby the holding body 59 once rises to the maximum raised position shown by the phantom line in FIG. Rear locking part 72
The horizontal shaft 41 of the movable cylinder 32 in the connection position is locked therein, and thus the movable cylinder 32 is held in the connection position, and the rear yoke 49 of the rear universal joint 45 is in the connection posture with respect to the input shaft 29. Retained.

By the way, in the above case, due to a cause such as a clogging between the equipment cylinder 31 and the movable cylinder 32 of the clutch device 28, the coil spring is
There is a possibility that the movable cylinder 32 may not move to the rear side due to the elastic force of 57, but even in such a case, the front actuating portion 68 of the position changing body 58 is rotated to the horizontal axis by rotating the position changing body 58 to the rear side. Since the movable barrel 32 is pushed rearward via 41, the movable barrel 32 can be easily moved to the coupling position.

As described above, the work of connecting the tiller R to the tractor 1 is completed.

Next, when separating the tiller R from the tractor 1,
The work is performed in the reverse order of the above. First, in the clutch device 28, the operation lever 64 is rotated rearward.

As a result, the position changing body 58 rotates forward, the cam pin 74 of the holding body 59 moves relatively rearward in the cam groove 73, and the holding body 59 first rises and then The horizontal shaft 41 is relatively disengaged downward from the locking portion 72, and the holding by the holding body 59 at the connecting position of the movable cylinder 32 is released.

Then, if the operation lever 64 is further rotated rearward,
The rear operating part 69 of the position changing body 58 contacts the horizontal shaft 41,
When 44 is reduced, the movable cylinder 32 is moved to the separation position against the coil spring 57 via the horizontal shaft 41, and the rear yoke 49 of the rear universal joint 45 is separated from the input shaft 29 to the front side. .

Along with this, the cam pin 74 moves to the rear end portion of the cam groove 73, the holding body 59 descends, and the horizontal shaft 41 is relatively fitted and locked in the front locking portion 71 from below. The movable barrel 32 is held in the separated position.

Next, the retaining pin 94 is pulled out from the inside of the lower engaging portion 89, rotated, locked by the holding plate 96, and held in the pulled out state.

In this state, the hydraulic device 3 lowers the cultivating device R via the three-point link mechanism 9 and the connecting body 14 to cultivate the cultivating device R.
The cultivating part 83 of is grounded.

When the three-point link mechanism 9 and the connecting body 14 are further lowered, the tiller R tilts forward, and first, the connecting shaft bodies 18 of the connecting body 14 are disengaged from the insides of the lower engaging portions 89. , Then the connected body 14
The upper engaging portion 88 is relatively disengaged from the cutout portion 22 toward the upper side.

Along with this, the input shaft 29 is also equipped with a clutch device 28 including a cylinder 31.
And the positioning body 99 is also removed from the inside of the receiving body 102, and the separation work of the tiller R from the tractor 1 is completed.

In the embodiment, the universal joint is used as the joint that connects the PTO shaft and the input shaft, but other joints may be used.

Further, in the embodiment, the positioning means is composed of the positioning body and the receiving body, but it is not limited to this.

Further, although the rotary tiller is used as the working machine in the embodiment, a working machine other than the rotary tiller may be used.

The present invention can also be applied to a device that connects a working machine to the front side of a tractor.

(Effects of the Invention) As described in detail above, according to the present invention, not only the connecting work between the three-point link mechanism and the working machine, but also the connecting work between the PTO shaft of the tractor and the input shaft of the working machine is easy and reliable. The work of connecting the working machine to the tractor can be performed more easily and in a shorter time. Further, it is possible to suitably correct the deviation of the shaft center between the PTO shaft side connecting shaft and the input shaft of the working machine, which is inevitably caused during the connecting work, so that the two shafts can be connected smoothly and satisfactorily. The present invention has the above advantages and is of great benefit.

[Brief description of drawings]

The drawings show one embodiment of the present invention, and FIGS. 1 and 2 are partially sectional side views of essential parts showing different actuating postures, and FIG.
FIG. 4 is the same front view, FIG. 4 is an overall side view, FIGS. 5 to 7 are side views of clutch devices and the like showing different operating postures, FIG. 8 is the same front view, and FIG. 5 is a sectional view taken along the line AA of FIG. 5, and FIGS. 10 and 11 are exploded sectional views of the clutch device and the like showing different operating postures. 1 ... tractor, 2 ... hydraulic device for lifting work equipment (elevating device), 8 ... PTO shaft, 9 ... 3-point link mechanism, 10 ...
Top link, 11 …… Lower link, 14 …… Connected body, 28…
… Clutch device, 29 …… input shaft, 31 …… equipment cylinder (equipment body), 32 …… movable cylinder, 33 …… operation device, 49 …… rear yoke (connecting shaft), 88,89 …… upper / lower Engagement part, 92 ... Blocking device, 98 ... Spindle, 99 ... Positioning body, 101 ... Spring, 10
2 …… Receptor, R …… Rotary tiller.

Claims (1)

[Claims] 1. A three-point link mechanism (9) mounted on a tractor (1)
Connect the connecting body (14) to the working machine side end of the connecting body (14)
And the working machine (R) respectively, the upper engaging portion and the left and right of the working machine (R) approaching and engaging by raising the connecting body (14) with the upper engaging portion engaged. In a coupling device for a tractor and a working machine provided with a pair of lower engaging portions, a pivotal shaft (98) is used to pivot the connecting body (14) at a position substantially corresponding to the working machine input shaft (29). The supported equipment body (31), a neutral means for elastically holding the equipment body (31) at the neutral position of the rotation range, and a movable tube (3) movably arranged back and forth on the equipment body (31).
2) and the P of the tractor (1) supported in the movable cylinder (32).
Connecting shaft that can be connected to the TO shaft (8) and the input shaft (29)
(49) and the equipment body (3
Positioning means for rotating the connecting shaft (49) so that the shaft center of the connecting shaft (49) corresponds to the input shaft (29) and the movable cylinder (32) are moved to connect the connecting shaft (49).
A connecting device for a tractor and a working machine, comprising: an operating device (33) for moving the input shaft (29) from a separation position to a connecting position.