JPS63148902A - Hitch apparatus of tractor and working machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a coupling device for a tractor and a working machine.

(Prior art) When a rotary tiller is connected to the rear of a tractor in a movable and detachable manner via a three-point link mechanism consisting of a top link in the center and a pair of lower links on the left and right, this connection work is performed. The technology that makes it easy to
It is disclosed in Japanese Patent Application Laid-Open No. 60-259104.

In the above system, the working machine side ends of the top link and both lower links are connected by a connecting body, and the tilling device is removably engaged at the upper part of the center in the left and right direction when the connecting body is raised. and a pair of left and right lower engaging parts,
When the connecting body is further raised after being engaged with the upper retaining part, the working machine rotates toward the tractor around the upper retaining part, and the left and right sides of the connecting body are connected to the lower engaging parts. A blocking device is provided which releasably prevents the left and right side portions of the connecting body from disengaging from the respective lower engaging portions.

Therefore, in the above system, when connecting the tractor and the tilling device, the tractor is moved backwards to approach the tilling device, and then the connecting body is raised and the connecting body is connected to the upper and lower engaging parts of the tilling device. The simple operation of engaging the connecting body and preventing it from coming off from the lower engaging part using the blocking device,
An advantage is that both lower links can be connected to a tilling device.

(Problem to be Solved by the Invention) However, in the above method, no consideration is given to facilitating the connection between the PTO shaft of the tractor and the input shaft of the tilling device, and improvements in this regard are desired. has been done.

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

(Means for Solving the Problems) In order to solve the above problems, the present invention employs one top link 10 in the center and a pair of left and right lower links 11.
A work implement R is removably connected to the tractor 1 via a three-point linkage mechanism 9 consisting of a In the structure in which the shaft 29 is releasably connected, the working machine side ends of the top link 10 and both lower links 11 are connected by the connecting body 14, and the working machine R is moved in the left and right direction when the connecting body 14 is raised. It has an upper retaining part 88 to which the upper part of the central part is removably engaged, and a pair of left and right lower engaging parts 89, and the connecting body 14 further rises after being engaged with the upper engaging part 88. By being pushed, the work implement R engages the upper engaging portion 8.
8 to the tractor 1 side, so that the left and right sides of the connecting body 14 are removably engaged with the lower engaging parts 89, and the lower left and right sides of the connecting body 14 are rotated toward the tractor 1 side. A blocking device 92 that releasably prevents disengagement from the engaging portion 89 and a clutch device 2
8, and the clutch device 28 includes a fixed cylinder 31 arranged substantially in the front-rear direction and fixed to the connecting body 14, and a fixed cylinder 3.
1, a movable cylinder 32 is disposed within the movable cylinder 32 so as to be movable in the axial direction and to be rotatable around a horizontal axis 41 parallel to the rotation axis during the rotation of the work machine R; An operating device 33 that can be moved in the direction to change and hold the position between a tractor-side holding position and a working machine-side holding position, and a spline portion 53 that is supported within a movable cylinder 32 and interlocks with the PTO shaft 8 are formed. The horizontal shaft 41 is located near the end of the spline portion 53 on the working machine side in the axial direction of the spline portion 53;
After the connecting body 14 engages with the upper and lower connecting parts 88 and 89,
By moving the movable cylinder 32 from the tractor side holding position to the working machine side holding position by the operating device 33,
The spline portion 53 is removably spline-fitted to the spline portion 52 of the input shaft 29 .

(Next page) (Function) When connecting the tilling device R illustrated as a working machine to the tractor 1, the clutch device 28
As shown in FIG. 1, the movable cylinder 32 is held at the tractor side holding position.

In the above state, the movable cylinder 32 largely protrudes forward from the fixed cylinder 31, and the horizontal shaft 41 is located at the front end of the guide groove 35. Further, the position changing body is in the forward rotating position on the 5th day, and thereafter the actuating portion 69 is in contact with the horizontal shaft 41 or in a position slightly behind it.

On the other hand, the tilling device R is placed on the ground and is tilted slightly forward as shown in FIG. 3. In this tilling device R, as shown in FIG. The retaining pin 94 of the blocking device 92 is pulled up to the blocking position and held by the regulating body 96 in the holding position, and the hook 100 is oriented horizontally.

In the above case, the center of gravity of the regulating body 96 is set so that the regulating body 96 in the release position is urged toward the holding position by its own weight, and the regulating body 96
10, so when setting the retaining pin 94 to the blocking position, the retaining pin 9
4 to the blocking position, the regulating body 96 will automatically change its position from the release position to the holding position. After that, if you release the retaining pin 94, the retaining pin 94 will be moved to the inhibiting position by the regulating body 96. Therefore, the retaining pin 94 can be easily moved to the blocking position.

In this state, the tractor 1 is moved backward to approach the tilling device R, and as shown in FIG. 22 and each connecting shaft body ] 3 respectively.

Next, the three-point linkage mechanism 9, the connecting body 14, and the club.

The child device 28 is gradually raised by the hydraulic device 3, and the upper punch fitting portion 88 is first engaged in the notch portion 22 of the connecting body 14. In this state, each connecting shaft body 18 is connected to each lower punch. It is located on the front side of the joining part 89.

Then, if the three-point linkage 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.
As the point linkage mechanism 9 and the like rise, the tilling device R is lifted and rotated around the upper punching portion 88 toward the tractor 1, that is, toward the front.

As a result, as shown in FIG. 13, each connecting shaft body 18 is relatively fitted and secured into each lower punching part 89 from the front side.
Each connecting shaft body 18 comes into contact with the cam surface 109 of the regulating body 96, and rotates the regulating body 96 toward the rear side, and as shown in FIG. Engage in position.

Also, by rotating the regulating body 96 rearward, the retaining pin 9
The retaining pin 94 is moved downward by the biasing spring 95, and the retaining pin 94 is moved downward by the biasing spring 95 to release the retaining pin 94 from the first
As shown in Figure 2, the connection shaft 18 is in the retaining position.
The connecting shaft 18 is engaged in the circumferential groove 24 of the connecting shaft 18 to prevent the connecting shaft 18 from coming off the lower punching portion 89.

In the above case, even if the connecting shaft 18 deviates from the normal movement path, each connecting shaft 18
is repositioned to the normal movement path.

By the way, when the connecting body 14 and the tilling device R are connected, as the tilling device R rotates around the upper engagement portion 88 toward the tractor 1 side, as shown in FIGS. 8 and 11,
The input shaft 29 of the tilling device R is connected to the fixed cylinder 3 of the clutch device 28.
1 and faces the rear yoke 49, which is the connecting shaft of the rear universal joint 45, with a small gap therebetween.

In this case, the front end of the input shaft 29 may fit into the tapered surface 55 or smooth surface 54 of the rear yoke 49.

Therefore, when connecting the rear yoke 49 to the input shaft 29 from the above state, the driver on the seat 5 reaches back and rotates the operating lever 64 of the clutch device 28 forward. That's what I do.

As a result, both position change bodies 5
8 rotates rearward, and the cam pins 74 of each holding body 59 move relatively forward within the cam grooves 73 of each position changing body 58. As a result, as shown in FIG. The body 59 rises against the biasing spring 60, and the horizontal shaft 41 separates from the front locking portion 71 relatively downward.

At this time, the horizontal axis 41 represents both the front and rear operating parts 6 of the position change body 5 days.
It is located approximately in the center between 8.69 and 8.69.

When the horizontal shaft 41 is released from the front locking portion 71 of the holder 59, the movable tube 32 is biased rearward by the coil spring 57, so the movable tube 32 is While extending the shaft 44, the horizontal shaft 41 and the rear universal joint 45 move rearward together with the rear yoke 49, and as shown in FIGS. 6 and 10, are fitted onto the input shaft 29 and the rear yoke 49 The female spline portion 53 of the input shaft 29 is connected to the male spline portion 52 of the input shaft 29.
mated to.

By the way, even after the horizontal shaft 41 is unlocked by the front locking part 71 of the holding body 59, the operating lever 46 is rotated forward, and the position changing body 58 is moved to the position shown in FIG. It is rotated rearward, and its front actuating portion 68 is in contact with or slightly forward of the horizontal shaft 41 of the movable cylinder 32 in the cultivating device side holding position.

Further, due to the rotation of the position changing body 58, the cam pin 74 of the holding body 59 moves relatively forward in the cam groove 73, and thereby the holding body 59 is temporarily moved to the position indicated by the imaginary line in FIG. After rising to the maximum raised position shown in FIG.
As a result, the movable cylinder 32 is held at the holding position, and the rear yoke 4 of the rear universal joint 45 is locked.
9 is held in a connected position with respect to the input shaft 29.

By the way, in the above case, there is a possibility that the movable cylinder 32 may not move rearward due to the elastic force of the coil spring 57 due to mud clogging between the fixed cylinder 31 and the movable cylinder 32 of the clutch device 28. Even in such a case, by rotating the position changing body 58 to the rear side, the front actuating part 6
Since the movable cylinder 32 is pushed rearward via the horizontal shaft 41, the movable cylinder 32 can be easily moved to the tilling device side holding position.

Furthermore, in the above case, the input shaft 29 does not enter the movable cylinder 32 from the rear in the axial direction, but instead enters the tilling device R.
rotates forward around the upper engagement portion 88, and due to the rotation around the rotation axis, the input shaft 29 enters the movable cylinder 32, and the rear end of the rear yoke 49 of the rear universal joint 45 Since the input shaft 29 and the rear yoke 49 face each other with a small gap, even when the input shaft 29 and the rear yoke 49 are not deviated from their normal posture or position before connection, the rear yoke 4
The axes of both the input shaft 9 and the input shaft 29 intersect.

Therefore, when connecting the rear yoke 49 and the input shaft 29, the female spline portion 53 of the rear yoke 49 is rotated upward at the rear end, and the rear end of the female spline portion 53 is rotated upward without changing the position of the rear end. It is necessary to change the inclination of the axis of the spline part 53 so that the axes of the female spline part 53 and the male spline part 52 of the input shaft 29 correspond to each other.

Thus, the movable cylinder 32 supporting the rear yoke 49 is connected to the fixed cylinder 3.
1, it is rotatably supported around a horizontal shaft 41 parallel to the rotational axis of the tilling device R, and this horizontal shaft 41 is located near the rear end in the axial direction of the female spline portion 53, so that the rear When the yoke 49 and the input shaft 29 are connected, the rear yoke 49 rotates around the horizontal axis 41 together with the movable cylinder 32, so that
The female spline portion 53 of the rear yoke 49 changes the inclination of its axis without changing the position of its rear end, thereby making it easy to align the axes of the female spline portion 53 and the male spline portion 52 of the input shaft 29. Accordingly, the connection between both spline portions 52 and 53 is performed smoothly and well.

Moreover, the movable cylinder 32 and the rear yoke 49 are relative to the fixed cylinder 31,
Since the rear yoke 49 and the input shaft 29 can be freely rotated around the vertical axis perpendicular to the horizontal axis 41 and can be moved in parallel in any radial direction, the rear yoke 49 and the input shaft 29 can be placed in the normal position and normal posture before connection. Even if the rear yoke 49 and input shaft 2
9, when the rear yoke 49 and the movable cylinder 32 rotate around the horizontal axis 41 and the above-mentioned vertical axis, or move in parallel in the radial direction, the axes of both the rear yoke 49 and the input shaft 29 are The rear yoke 49 and the input shaft 29 can be easily and smoothly connected.

As described above, the connection work of the tilling device R to the tractor 1 is completed.

Next, when separating the tilling device R from the tractor 1,
The work is performed in the reverse order to the above, and first, in the second clutch device, the operating lever 64 is rotated rearward.

As a result, the position changing body 58 rotates forward, and the cam pin 74 of the holding body 59 moves relatively rearward within the cam 3, and the holding body 59 first rises and then engages. The horizontal shaft 41 is relatively released downward from the stop portion 72, and
The holding of the movable cylinder 32 by the holding body 59 at the tilling device side holding position is released.

When the operating lever 64 is further rotated to the rear, the rear actuating portion 69 of the position changing body 58 comes into contact with the horizontal shaft 41, reducing the transmission shaft 44 and moving the horizontal shaft 41. , the movable cylinder 32 is moved to the tractor side holding position against the coil spring 57, and the rear yoke 4 of the rear universal joint 45 is moved.
9 is detached from the input shaft 29 to the front side.

At the same time, the cam bin 74 moves to the rear end of the cam groove 73, the holder 59 descends, and the front locking portion 7
The horizontal shaft 41 is relatively fitted and locked into the movable cylinder 32 from below, and the movable cylinder 32 is held at the tractor-side holding position.

By the way, when the rear coke 49 of the rear universal joint 45 and the input shaft 29 are connected and disconnected by the clutch device 28, the position changing body 59 of the clutch device 28 and the holding body 59 are operated by a single operating lever 64. , the operation of the clutch device 28, that is, the rear yoke 49 of the rear universal joint 45 and the input shaft 29.
It is easy to connect and release the connections.

Furthermore, since the left and right position changing bodies 58 are interlocked by the first interlocking body 62, and the left and right holding bodies 59 are interlocked by the second interlocking body 63, the left and right position changing bodies 58 and the left and right holding bodies 58 are interlocked. The body 59 can be synchronized and operated well,
The movable tube 32 and the like can be operated reliably without fear of complicating it.

Furthermore, the rear yoke 49 of the rear universal joint 45 is used as a connecting shaft that directly connects to the input shaft 29, and the movement of the rear yoke 49 performed when the rear yoke 49 is connected to the input shaft 29 and when the connection is released is made by the expansion and contraction of the transmission shaft 44. Since the clutch device 28 is not provided with a separate extendable portion to allow the movement, the clutch device 28 can be made compact, and the distance between the tractor 1 and the tilling device R can be made smaller than before. It won't be long.

Then, pull up the locking pin 94 of the blocking device 92 and release the hook 100 as shown by the imaginary line in FIG.
is locked in the engagement recess 98 of the fixing plate 97, and the retaining bottle 9 is secured.
4 in the blocking position.

In this state, the tilling device R is lowered by the hydraulic device 3 via the three-point linkage mechanism 9 and the connecting body 14, and the tilling portion 83 of the tilling device R is brought into contact with the ground.

Then, when the three-point linkage mechanism 9 and the connecting body 14 are further lowered, the tilling device R is tilted forward, and each of the lower engaging portions 89
Each connecting shaft body I8 of the connecting body 14 is separated from the inside, and then,
The upper engaging portion 88 separates from the cutout portion 22 of the connecting body 14 relatively upwardly.

At the same time, the input shaft 29 is also relatively detached rearward from the movable cylinder 32 of the clutch device 28, and the separation operation of the tilling device R from the tractor 1 is completed.

(Example) Hereinafter, the first example of the present invention will be described based on the drawings.
In Fig. 2, 1 is a tractor, 2 is a tractor body, and 3 is a tractor.
1 is a hydraulic device for elevating and lowering a work machine, which is exemplified as a lifting device mounted on the rear part of a tractor body 2, and has a pair of left and right lift arms 4. 5 is a seat, 6 is a rear wheel, 7 is a rear wheel fender, and 8 is a PTO shaft, which protrudes rearward from the rear end of the vehicle body 2.

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

The three-point link mechanism 9 consists of a top link 10 shown as a single upper link in the center and lower links ll shown as a pair of left and right lower links, and each lower link 11 and each lift arm 4 are connected to a lift rod 12, respectively. are connected by.

As shown in FIGS. 1, 3 to 5, a connecting body 14 connects the working machine side ends, that is, the rear ends, of the top link 10 and both lower links 11. A cylindrical main body 15 that has an upwardly projecting mountain shape when viewed from the front;
A pair of left and right side plates 16 projecting upward and diagonally backward from the upper end of the center portion in the left and right direction, a pair of left and right cylinders 17 arranged in the left and right direction at both left and right ends of the main body 15, and each cylinder. 17
It is composed of a pair of left and right connecting shaft bodies 18 which protrude outward from the outer end of the cylinder body 17 and have a diameter smaller than that of the cylindrical body 17.

A ball joint portion 20 at the rear end of the top link 10 is removably connected between the front portions of the left and right side plates 16 by a mounting pin 21. A notch 22 that opens diagonally upward and rearward is formed at the rear of both side plates 16, and the upper part of the notch 22 gradually widens toward the upper end.

A side chamber body 23 having a hollow truncated cone shape is fitted and fixed onto the outer end of each cylinder 17 with the small diameter end face facing outward.

A circumferential groove 24 is formed in the inner side of each connecting shaft body 18, and a ball joint part 25 of each lower link 11 is removably fitted into the outer side of the connecting shaft body 18, and is prevented from coming out by a pin 26.

Reference numeral 28 denotes a clutch device that releasably connects the PTO shaft 8 of the tractor 1 and the input shaft 29 of the tilling device R, and is located at the lower side of the center portion in the left-right direction of the coupling body 14, as shown in FIG. As shown in FIGS. 11 to 11, it has a fixed tube 31, a movable tube 32, an operating device 33 for the movable tube 32, and the like.

The fixed cylinder 31 is disposed in the front-rear direction and is sloped downward in the front, and the lower part of each left and right side of the fixed cylinder 31 and each cylinder 1
7 are releasably connected to the lower surface by a pair of left and right supporting members 34. A pair of left and right guide grooves 35 are cut out in the vertical center of both left and right sides of the fixed cylinder 31 in the axial direction from the rear end toward the front. A spring bearing ring 36 is fixed to the rear end of the fixed cylinder 31 and projects radially inward.

The movable cylinder 32 is arranged concentrically within the fixed cylinder 31, and includes an outer cylinder 37, an inner cylinder 38 concentrically arranged inside the front side of the outer cylinder 37, and both cylinders. Before connecting bodies 37 and 38
It has rear mounting pieces 39, 40, etc.

A pair of left and right horizontal shafts 41 protrude outward from the front end of the inner cylinder 38, and are inserted into each guide groove 35 of the fixed cylinder 31 so as to be movable in the longitudinal direction and relatively rotatable. As a result, the movable cylinder 32 is provided on the fixed cylinder 31 so as to be movable in the axial direction and rotatable around the horizontal axis 41. or,
Due to the backlash between the horizontal shaft 41 and the guide groove 35 and the gap between the fixed cylinder 31 and the movable cylinder 32, the movable cylinder 32 is disposed at the rear end of the fixed cylinder 3.
1, the movable cylinder 32 is freely rotatable around a vertical axis perpendicular to the horizontal axis 41, and is also freely movable in parallel in any radial direction.

A stopper 42 exemplified by a retaining ring is provided on the inner surface of the rear end of the fixed cylinder 31, and this stopper 42 and the horizontal shaft 41
By abutting against each other, movement of the movable cylinder 32 backward relative to the fixed cylinder 31 by more than a predetermined amount is restricted.

A plurality of front and rear mounting pieces 39 and 40 are arranged at equal intervals in the circumferential direction, for example, three or more pieces, and the rear mounting pieces 40 are arranged at equal intervals in the circumferential direction.
7 protrudes outward in the radial direction.

Then, the rear mounting piece 40 comes into contact with the inner surface of the fixed cylinder 31, and the ring 36 of the splash receiver comes into contact with the outside surface of the outer cylinder body 37, thereby preventing the movable cylinder 32 from moving more than a predetermined amount in the radial direction. Ru.

By the way, the PTO shaft 8 of the tractor 1 and the input shaft 29 of the tilling device R are releasably connected via a transmission shaft 44 and front/rear universal joints 45.45 provided at both ends of the transmission shaft 44. is linked to.

The transmission shaft 44 is made up of a cylindrical body 46 constituting its front side, and a shaft body 47 constituting its rear front side and slidably splined to the cylindrical body 46, and is expandable and retractable.

The rear universal joint 45 consists of front and rear yokes 48 and 49, and a spider 50 that connects the two yokes 48 and 49, and 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 part of the rear yoke 49 is connected to the movable cylinder 32.
It is supported by the inner cylindrical body 38 via a bearing 51. A female spline portion 53 is formed on the rear inner surface of the rear yoke 49 and is removably spline-fitted to the male spline portion 52 of the input shaft 29 . In addition, on the inner surface of the rear end of the rear yoke 49, behind the female spline part 53, a smooth surface 54 and a tapered surface 55 tapered toward the front are provided in succession toward the rear.

The operating device 33 of the movable barrel 32 moves the movable barrel 32 to the fixed barrel 31.
The movable cylinder 32 is moved in the axial direction relative to the
As shown in the figure, there is a front holding position where the fixed cylinder 31 largely protrudes forward, that is, a tractor side holding position, and a tenth holding position.
As shown in the figure, the position can be changed and held at the rear side holding position housed in the fixed cylinder 31, that is, the cultivating device side holding position, and the coil spring 57 and the position changing body 58 for the left and right pair, the holding position. a body 59, a biasing spring 60, and an interlocking mechanism 61;
First and second interlocking bodies 62, 63 and a single operating lever 64
etc.

The coil spring 57 is wound around the outer circumferential surface of the outer cylinder body 37 of the movable cylinder 32, and the spring receiver is interposed between the ring 36 and the rear attachment piece 40 in a spring-like manner to move the movable cylinder 32 backward, that is, till the field. Device R
It is biased towards the 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 circumferential surface of the fixed tube 31, and the small diameter portion 66 is in contact with the outer circumferential surface of the outer tube body 37 of the movable tube 32, so that the coil spring 57 causes the movable tube 32 to 3
1 so as to be movable in either radial direction.

In addition, the coil spring 57 has, in addition to the large and small diameter portions 65 and 66,
It may also have an intermediate diameter portion having a diameter intermediate therebetween.

A pair of left and right brackets 67 are erected at the upper portions of both left and right sides of the outer circumferential surface of the fixed cylinder 31, and a cylindrical first interlocking body 62 is inserted through both brackets 67 so as to be rotatable around the axis.

Each position changing body 58 is interlocked by a first interlocking body 62, and is fixed to each end thereof and disposed on the outside of the fixed cylinder 31. The position change body 58 is a movable cylinder 3
2 to each holding position via the horizontal shaft 41. At the bottom of the position changing body 58, front and rear operating parts 68 and 69 located on the front side or the rear side of the horizontal shaft 41 protrude downward. It is formed in the shape of

Each holding body 59 is arranged between the fixed cylinder 31 and each position changeable body 58, and has a support shaft 7 in the left and right direction connected to the fixed cylinder 31 at its rear end.
It is rotatably supported by 0. The holding body 59 has front and rear locking portions 7L72, and each of the front and rear locking portions 71.
By removably locking the horizontal shaft 41 to 72, the movable cylinder 32 is releasably held at each holding position.

The second interlocking body 63 is formed by bending a rod into a U shape, and is externally fitted onto the front part of the fixed cylinder 31 from below, with each end fixed to the front end of the holding body 59, and holding both the holding bodies 59 together. It is linked.

Each biasing spring 60 is elastically interposed between the rear end of each holder 59 and the support member 34, and biases each holder 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 side, and after the horizontal shaft 41 is released from the holding body 59, each operating portion 68. of the position changing body 58. 6
9 to operate the horizontal axis 41,
A cam groove 7 formed in a mountain shape on the lower side of the position change body 58
3, and a cam pin 74 that protrudes outward from the middle part of the holder 59 in the front-rear direction and is movably inserted into the cam groove 73.
It is composed of.

The operating lever 64 is used to operate the position changing body 58 and the holding body 59, and is provided to protrude upward from one side of the first interlocking body 62.

The tilling device R includes an input case leaf 6 located at the center in the left-right direction of the upper front part, a top mast 78 projecting diagonally upward forward from the input case leaf 6 and consisting of a pair of left and right side plates 77, and a top mast 78 formed from the input case leaf 6. A pair of support arms 79 protruding from both left and right sides, a pair of left and right brackets 80 protruding forward from the middle part of each support arm 79 in the left and right direction, and an upper end of each side plate 77 of the top mast 78 and each bracket. A pair of left and right support links 81 connecting the front end of each support arm 79 , a transmission case 82 and a side plate lowered from the outer end of each support arm 79 , and a horizontal suspension between the lower ends of the transmission case 82 and the side plate. A tilling section 83 that is rotatably driven and consists of a tilling shaft and a large number of tilling claws provided thereon, a tilling cover 84 that covers the tilling section 83, a pair of left and right gauge wheels 85, and these gauge wheels 85. It has a plowing depth adjustment mechanism 86 that raises and lowers the plowing depth.

An input shaft 29 protruding forward is rotatably supported in the input case shelf 6 by a bearing.

As shown in FIG. 4, between the upper ends of both side plates 77 of the top mast 78, an upper retaining part 88, exemplified by a bottle, is provided in the left-right direction, and the connecting body 14 is connected to the upper engaging part 88. Notch 2
2 are removably retained from the lower side, that is, they are removably fitted.

As shown in FIGS. 12 and 13, reference numeral 89 denotes a pair of left and right lower punching portions that are approximately U-shaped in side view, and each bracket 8
It is fixedly installed on the front part of 0 in a forward protruding manner.

The lower punching part 89 is sloped downward in the front, its upper wall protrudes forward from the lower wall, and the lower front surface of the earthen wall is sloped upward in the front. Each of the connecting shafts 18 of the connecting body 14 is removably engaged in each lower engaging portion 89 from the front side, that is, removably fitted.

As shown in FIGS. 12 to 14, reference numeral 92 denotes a pair of left and right blocking devices that releasably prevent the connecting shafts 18 from coming off the respective lower punching portions 89. , a retaining pin 94, a biasing spring 95, a regulating body 96, and the like.

The mounting tube 93 is erected on the upper surface of the upper wall of the lower punching portion 89 in a forward-inclined posture, and a fixing plate 97 is erected from the rear of the upper end of the outer peripheral surface of the mounting tube 93. At the upper end of the fixed plate 97,
A semicircular engagement recess 98 is formed.

The retaining pin 94 is inserted into the mounting tube 93 and the lower punching portion 89 so as to be movable in the axial direction of the mounting tube 93, that is, in the downward direction on the road. Then, it advances into the lower engaging portion 89 and engages the circumferential groove 24 of the connecting shaft body 18.
As shown in FIG. 13, there is a blocking position where the connecting shaft body 18 is prevented from coming off the lower engaging part 89 by engaging with the lower engaging part 89, and a blocking position where the connecting shaft body 18 is retracted upward from the lower engaging part 89 as shown in FIG. The position can be freely changed to a permissible position that allows engagement and disengagement with and from the lower punching portion 89 of 18. In the blocking position of the retaining pin 94, the retaining pin 94 is inserted into the upper and lower walls of the lower punching portion 89.

A downwardly tapered locking receiving surface 99 is formed at the lower end of the outer peripheral surface of the retaining pin 94, and a two-shaped hook 100 is formed at the upper end of the retaining pin 94. is fixed in an upwardly projecting manner, and as shown by the imaginary line in FIG. The retaining pin 94 is locked in the blocking position.

A spring retainer includes a ring 101 and a retaining ring 1 that holds the ring 101 in the middle of the outer peripheral surface of the retaining pin 94 in the vertical direction.
02, the spring receiver is a ring 101, and the spring receiver on the upper end side of the mounting tube 93 is a ring 103, and an urging spring 95 wound around a retaining pin 94 is interposed in a resilient manner. ,
The retaining pin 94 is urged downward, that is, toward the blocking position. 104 is a retaining ring. In addition, in the blocking position of the retaining pin 94, the retaining ring 102 is in contact with the lower punching portion 89.

A support shaft 105 projects inward from the lower end of the front portion of each bracket 80, and the lower end of the regulating body 96 is rotatably provided on the support shaft 105.

The regulating body 96 has a notch 107 formed in the lower engaging portion 89.
The upper end of the front end surface thereof is a locking surface 108 that slopes forward downward, and the lower side of the locking surface 108 of the front end surface is a cam surface 109 that slopes forward upward. has been done.

The regulating body 96 has its locking surface 10 as shown in FIG.
8 locks the locking receiving surface 99 of the retaining pin 94 to prevent it from coming out.

It is possible to freely change the position between a holding position in which the pin 94 is releasably held in the blocking position and a position in which the holding is released, as shown by the imaginary line in FIG. 12 or 13.

In the holding position, the regulating body 96 comes into contact with the inner surface of the lower end of the notch 107, and the inner surface serves as the stopper portion 110, and
In the released position shown in FIG.
It is in contact with the inner surface.

As shown by the imaginary line in FIG. 13, the position where the regulating body 96 makes contact with the support arm 79 is the rearmost released position, but even in this released position, the center of gravity of the regulating body 96 is , and is positioned in front of the vertical line P passing through the center of the support shaft 105, so that the regulating body 96 is biased toward the holding position by its own weight no matter which release position it is in. .

16 and 17 show a second embodiment of the present invention, in which a cam groove 73 is provided on the inner surface of the position changing body 58.
A cam plate 112 is fixed to protrude inwardly, and the cam plate 112
is located below the cam pin 74.

18 and 19 show a third embodiment of the present invention, in which a second interlocking body 63 is externally fitted onto the fixed cylinder 31 from above, and an operating lever 64 is provided on the second interlocking body 63. It is being In addition, the spring receiver includes brackets 113 that protrude rearward from the left and right sides of the ring 36.
A biasing spring 114 is interposed between the holder 13 and the holder 59, and the holder 59 is moved between the positions where the horizontal shaft 41 is locked to the rear locking portion 72 as shown in FIG. 18, and the position shown in FIG. As shown, the front locking portion 71 can be freely switched to a position where the horizontal shaft 41 is locked.

FIG. 20 shows a fourth embodiment of the present invention, which is a modification of the third embodiment.

That is, in the third embodiment, the cam groove 73 is formed in the position changing body 58, but in the fourth embodiment, a pair of cam plates 112 are fixedly provided on the inner surface of the position changing body 58.

21 to 24 show a fifth embodiment of the present invention, in which a side chamber body 23 is externally fitted and fixed to a connecting shaft 18 of a connecting body 14.

A facing plate 116 fixed to the support arm 79 is fixedly fixed to the inner side of the bracket 80 in a facing manner.
80 and the front part of the opposing plate 116, a lower punching part 89, in which the connecting shaft body 18 is releasably engaged, is provided in a curved shape in the rearward direction.

Reference numeral 117 denotes a curved retaining body, which is disposed between the bracket 80 and the opposing plate 116, and is rotatably provided by a support shaft 118 in the left and right direction, and as shown in FIG.
8 , thereby preventing the connecting shaft body 18 from coming off from the lower punching portion 89 . A cam surface 119 is formed on the front lower surface of the retaining body 117 in a curved protrusion shape and is inclined forwardly.

An interlocking lever 120 located on the inner side of the opposing plate 116 is disposed at the lower end of the support shaft 118.
A biasing spring 123 is interposed in an elastic manner between the hook shaft 121 of No. 20 and the hook shaft 122 fixed to the upper end of the opposing plate 116, and the retaining body 117 is configured as shown in FIG. As shown in FIG. 23, the interlocking lever 120 is in a permissible position in contact with the support arm 79, and the retainer 117 is in contact with the hook shaft 1.
The position can be freely changed to the release locking position where it abuts against 22.

When the retainer 117 is in the permissible position, the connecting shaft 1 is attached to the cam surface 119 of the retainer 117, as shown in FIG.
8 are brought into contact with each other, the retaining body 117 is pushed up, and engagement of the connecting shaft body 18 into the lower punching portion 89 is permitted.

In addition, in the release position of the retaining body 117, as shown in FIG. 23, the connecting shaft body 18 is allowed to separate from the lower punching portion 89.

Further, in the embodiment, a universal joint is used as a joint for connecting the PTO shaft and the input shaft, but other joints may be used.

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

Furthermore, the present invention is also applicable to a device for connecting a working machine to the front side of a tractor.

(Next page) (Effect of the invention) As detailed above, according to the present invention, it is possible to not only connect the three-point link mechanism and the working machine, but also connect the PTO shaft of the tractor and the input shaft of the working machine. This can be done easily and reliably, and the work of connecting one working machine to a tractor can be done even more easily and in a shorter time. In addition, the misalignment between the PTO shaft-side connecting shaft and the input shaft of the working machine that inevitably occurs during the connecting work can be suitably corrected, and the above-mentioned two wheels can be connected smoothly and well.6 The present invention has the above-mentioned advantages. It is very profitable.

[Brief explanation of the drawing]

1 to 15 show a first embodiment of the present invention.
The figure is a partial cross-sectional side view of the main part, the second figure is an overall side view, and the third figure is a side view of the main part.
The figure is a partially sectional side view of the main part during connection work, Fig. 4 is a partially sectional front view of the main part, Fig. 5 is a partially sectional front view of the connecting part of the coupling body and the top link, and Fig. 6 8 to 8 are side views of the clutch device etc. showing different operating positions, FIG. 9 is a front view of the same, and each of FIGS. 12 and 13 are longitudinal sectional views of the blocking device and the lower punching part, etc., showing different operating positions, and each of FIGS. 14 and 15 is the A--A of FIG. 16 and 17 show a second embodiment of the present invention, FIG. 16 is a side view of the clutch device, etc., FIG. 17 is a front view thereof, and FIGS. 18 and 19. 18 shows a third embodiment of the present invention, and FIGS. 18 and 19 are side views of the clutch device etc. showing different operating positions, and FIG.
Figure 0 is a side view of a clutch device etc. according to a fourth embodiment of the present invention.
FIGS. 21 to 24 show a fifth embodiment of the present invention, and FIGS. 21 to 23 are longitudinal sectional views of the blocking device and the lower punching portion showing different operating positions, and FIGS. The figure is a plan view of the same. 1-Tractor, 8-PTO axis, 9-3-point link mechanism, 10-1-tube link, 11-lower link, l
t-series connection, 18-series connection shaft, 28-clutch device,
29--input shaft, 31-fixed cylinder, 32--movable cylinder, 3
3--Operating device, 41--Horizontal shaft, 44--Transmission shaft, 4
5- Universal joint, 49- Rear yoke (connection shaft), 5
2.53-Male and female spline parts, 57--Coil spring, 58--Position changing body, 59--Holding body, 61--Synchronized movement mechanism, 62.63--First and second interlocking body , 64-
・-Operation lever, 65.66-Large/small diameter part, 88.89
- Upper/lower engaging portion, 92 - Blocking device, 94...- Removal prevention pin, 95- Biasing spring, 96-... Regulating body. Patent applicant Kubota Tekko Co., Ltd. Procedural amendment (voluntary) September 25, 1988 Patent application No. 297375 2, Title of invention Tractor and working machine coupling device 1013 Mikuriya, Higashiosaka City, Osaka Prefecture Telephone number 06 (782) 6917/6918 Showa
Year, month, day (voluntary) 6. Subject of amendment

Claims (1)

[Claims] (1) The work implement R is removably connected to the tractor 1 via a three-point linkage mechanism 9 consisting of a top link 10 in the center and a pair of lower links 11 on the left and right, and both lower links 11
can be raised and lowered by the lifting device 3, and the PTO of the tractor 1
In the structure in which the shaft 8 and the input shaft 29 of the working machine R are releasably connected, the working machine side ends of the top link 10 and both lower links 11 are connected by a connecting body 14, and the working machine R is It has an upper engaging part 88 with which the upper part of the center part in the left and right direction is removably engaged when the body 14 rises, and a pair of left and right lower engaging parts 89, and the connecting body 14 is connected to the upper engaging part 88. By being further raised after engaging with the upper engaging portion 88, the work implement R
8 to the tractor 1 side, so that the left and right sides of the connecting body 14 are removably engaged with the lower engaging parts 89, and the lower left and right sides of the connecting body 14 are rotated toward the tractor 1 side. A blocking device 92 that releasably prevents disengagement from the engaging portion 89 and a clutch device 2
8, and the clutch device 28 includes a fixed cylinder 31 arranged substantially in the front-rear direction and fixed to the connecting body 14, and a fixed cylinder 3.
1, a movable cylinder 32 is disposed within the movable cylinder 32 so as to be movable in the axial direction and to be rotatable around a horizontal axis 41 parallel to the rotation axis during the rotation of the work machine R; An operating device 33 that can be moved in the direction to change and hold the position between a tractor-side holding position and a working machine-side holding position, and a spline portion 53 that is supported within a movable cylinder 32 and interlocks with the PTO shaft 8 are formed. The horizontal shaft 41 is located near the end of the spline portion 53 on the working machine side in the axial direction of the spline portion 53;
After the connecting body 14 engages with the upper and lower engaging parts 88 and 89,
By moving the movable cylinder 32 from the tractor side holding position to the working machine side holding position by the operating device 33,
A tractor-work machine coupling device characterized in that a spline portion 53 is removably spline-fitted to a spline portion 52 of an input shaft 29.