JP2524971B2 - A device that transmits the power of the tractor to the work machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a device for transmitting power of a tractor to a working machine, which is interposed between a power take-off shaft of the tractor and an input shaft of the working machine, and which are mutually connected. Related to those that connect.

(Prior Art) Conventionally, as a device for transmitting the power of a tractor to an input shaft of a working machine, for example, as described in Japanese Patent Laid-Open No. 61-85101, a power transmission shaft is attached to a power take-off shaft of the tractor. One of the universal joints is spline-fitted, and the other universal joint of the power transmission shaft is spline-fitted to one end of the power relay shaft of the connecting frame suspended by the tractor, and the other end of the power relay shaft is The conical spline convex portion formed in the portion is spline-fitted into the conical spline concave portion projected on the input shaft of the working machine, and the power of the power take-off shaft is passed through the power transmission shaft and the power relay shaft. A structure for transmitting to the input shaft is known.

(Problems to be Solved by the Invention) According to the structure described in the above publication, the power relay shaft connected to the power transmission shaft is suspended in a state in which the position is fixed to the connection frame. When connecting to the input shaft, it cannot be connected if their mutual positions are misaligned, so it is necessary to set so that the spline convex part of this power relay shaft and the spline concave part of the input shaft match. However, it requires time and labor for centering, and the power transmission shaft must be spline fitted to each of the power take-off shaft of the tractor and the power relay shaft of the connecting frame.
There is a problem that connection work in a small work space requires labor.

Therefore, the present invention has been made in view of such a point, and it is possible to automatically connect the connecting portion of the universal joint on the working machine side of the power transmission shaft and the input shaft of the working machine in a narrow working space. It is an object of the present invention to provide a device for transmitting the power of a tractor that can be easily connected to a work machine.

(Means for Solving Problems) An apparatus for transmitting power of a tractor of the present invention to a working machine is
A connecting frame 1 interposed between the tractor A and the working machine 55 to connect them to each other, a universal joint 42 connected to the power takeoff shaft 45 of the tractor A at one end, and the working machine 55 at the other end are provided. Of the universal joint 46 on the working machine 55 side of the power transmission shaft 39 supported by the connection frame 1 so as to be vertically movable. And a joint support mechanism 30 that horizontally supports the connection portion 48. The joint support mechanism 30 is fixed to the left and right portions of the connection frame 1 and has a vertical guide long groove 18
Between the left and right guide plates 15, the front and rear support rods 19 supported horizontally in the guide long grooves 18 of the left and right guide plates 15 respectively, and the tip portions of the left and right support rods 19. Is fixed to the universal joint 46 on the working machine 55 side.
The support 23 has a connecting portion 48 rotatably mounted and is supported horizontally, and springs 29 that bias the left and right support rods 19 toward the working machine 55 side.

The input shaft 56 of the work machine 55 has an attachment 53 for spline-fitting the connecting portion 48 of the universal joint 46 on the work machine 55 side, and a joint support mechanism.
It is covered with a guide body 59 having an enlarged opening portion 65 for guiding the insertion of the support body 23 of 30.

(Operation) In the device for transmitting the power of the tractor of the present invention to the working machine, the connection frame 1 is connected and suspended by the suspension mechanism of the tractor A, and one end of the power transmission shaft 39 supported by the connection frame 1 is attached. The universal joint 42 is spline-fitted to the power takeoff shaft 45 of the tractor A.

Then, the linking frame 1 is moved up and down by the suspension mechanism of the tractor A, and the connecting portion 48 of the universal joint 46 on the working machine 55 side of the power transmission shaft 39 supported by the joint supporting mechanism 30 which is vertically movable on the connecting frame 1. When the tractor A is moved backward toward the working machine 55 with the input shaft 56 of the working machine 55 being opposed, the tractor A is horizontally moved by the support 23 of the universal joint 46 on the working machine 55 side of the power transmission shaft 39. The supported connecting portion 48 is brought into contact with the input shaft 56 of the working machine 55 and the axes are automatically fitted together, and the mutual mutual spline fitting is performed automatically.
The power of the power take-off shaft 45 is surely transmitted to the input shaft 56.

At this time, when the horizontal axis of the connecting portion 48 of the universal joint 46 on the working machine 55 side of the power transmission shaft 39 and the input shaft 56 of the working machine 55 are deviated from each other, the joint support mechanism 30 Left and right support rods 19 urged by springs 29 of
While moving vertically along the vertical guide long grooves 18 of the left and right guide plates 15 of the connecting frame 1, the axis of the connecting portion 48 of the universal joint 46 on the working machine 55 side and the input shaft 56 of the working machine 55 is automatic. Mating, and thus the splines are automatically fitted together.

Further, when the connecting frame 1 is rotated upward by the suspension mechanism of the tractor A, the connecting parts of the connecting frame 1 are connected to the connecting parts of the working machine 55.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

Reference numeral 1 is a connecting frame, and the connecting frame 1 is formed into a mountain shape by bending, and the connecting plates 2 having a substantially triangular shape are formed on the lower portions on both sides thereof.
2 are fixed integrally to each other, and mounting holes 4, 4 for detachably attaching the lower pins 3, 3 are formed on the front side of the left and right connecting plates 2, 2, respectively. Lower connecting rods 5, 5 are integrally and horizontally projected outward at the rear portions of the rear members 2, 2.

In addition, a pair of frame bodies 7, is provided on the top 6 of the connecting frame 1.
7 are respectively projected integrally upward in parallel with each other, and the front side portions of the pair of frame bodies 7, 7 are connected by upper and lower spacers, and a connecting pin 8 is provided near the upper end. Insertion holes 9 and 9 are formed to face each other so as to be detachably inserted. Further, an upper connecting rod 11 in the left-right direction is horizontally fixed between the expanded rear facing frame pieces 10, 10 of the pair of frame bodies 7, 7, and the facing rear frame pieces 10, 10 are opposed to each other.
On the upper rear side, guide portions 12, 12 that are expanded outward are formed by bending.

Next, L-shaped support frames 13 and 13 are fixed to the lower portions on both sides of the connecting frame 1 so as to face each other, and are connected to the connecting plate portions 14 and 14 inside the left and right supporting frames 13 and 13, respectively. Is a guide plate 15,15
Are fixed by a plurality of bolts and nuts 16, respectively. Further, vertical guide long grooves 18, 18 are formed in parallel on the inner side plate portions 17, 17 of the left and right guide plates 15, 15, respectively.
Horizontally extending front and rear support rods 19 and 19 are respectively inserted into the left and right guide long grooves 18 and 18 so as to be vertically movable and forward and backward.

Further, front stoppers 20 and 20 for preventing the guide rods 18 and 18 from coming off are formed at the front end portions of the left and right support rods 19 and 19, respectively, and the rear end portions of the left and right support rods 19 and 19 are formed. Rear stoppers 21 and 21 and spacers 22 and 22 are fixedly attached to these, respectively, and a cylindrical support member 23 is provided between the left and right spacers 22 and 22.
Is fixed horizontally.

In addition, vertical guide plates 24, 24 are fixed to the left and right guide plates 15, 15 in the middle rear part of the inner plate portions 17, 17 so as to face each other. Guide long grooves 25, 25 of the left and right L-shaped movable plates 2 are formed in the left and right guide long grooves 25, 25 in parallel with each other.
Reference numerals 6 and 26 are vertically movably attached via upper and lower guide rollers 27 and 27, respectively.

Further, linear ball bearings 28, 28 slidably supported in the front-rear direction in the middle of the left and right support rods 19, 19 are connected to the inner ends of the left and right movable plates 26, 26, respectively. Between the linear ball bearings 28, 28 and the rear stoppers 21, 21, the left and right support rods 19,
Coil springs 29, 29 are wound around 19 respectively. Then, the left and right coil springs 29, 29 urge the respective support rods 19, 19 rearward, and the front stoppers 20, 20 of the left and right support rods 19, 19 are respectively provided with the left and right guide long grooves. It is designed to come into contact with the opening edges of 18,18.

As a result, the left and right support rods 19, 19 are supported horizontally, and are supported so that they can move up and down and move forward and backward. Then, the left and right guide plates 15, 15 having the guide long grooves 18, 18, the left and right support rods 19, 19, the support 2
3, guide plates 24, 24 having long guide grooves 25, 25, left and right movable plates 26, 26 having guide rollers 27, 27, left and right linear ball bearings 28, 28, and left and right coil springs 29, 29
The joint support mechanism 30 is constituted by.

Further, a supporting frame 31 is projected on one side near the top 6 of the connecting frame 1, and projecting pieces 32, 32 are fixed to the left and right inside the top 6, respectively. A left and right rotating rod 33 is rotatably mounted on the shaft 32.
Vertical lock bars 34, 34, which are releasably engaged with the front portions of the rear stoppers 21, 21 of the left and right support rods 19, 19, are fixed in parallel to both ends of 33, respectively.

A vertical handle is provided at one end of the rotating rod 33.
35 is rotatably pivoted in the left-right direction, and the upper portion of the handle 35 is engaged with the guide groove 36 formed in the support frame 31 so as to be disengageably engaged with one of a plurality of engagement recesses 37. A coil spring 38 for urging the handle 35 is stretched around the handle 35.

Further, 39 is a power transmission shaft, and this power transmission shaft 39 has an inner cylinder 40 and an outer cylinder 41 that are fixed in the circumferential direction and are inserted so as to be movable back and forth in the axial direction. That is, the universal joint 42 is connected to the outer end portion, and the connecting cylinder 44 connected to the outer yoke 43 of the universal joint 42 is detachably spline-fitted to the power take-off shaft 45 of the tractor A. .

Further, a universal joint 46 is connected to the other end of the outer cylinder 41, that is, an outer end, and a large number of axially inner walls of a connecting cylinder 48 as a connecting portion connected and fixed to a yoke 47 on the outside of the universal joint 46. A spline 49 is formed, and the connecting cylinder 48 is rotatably fitted and locked in the supporting body 23 via a ball bearing 50 on the outer peripheral portion, and the connecting cylinder 48 is attached to the outer end of the supporting body 23. Guide hole for guiding rotation
An annular guide body 52 having 51 is fixed.

Furthermore, 53 is a cylindrical attachment, and this attachment 53 is formed with a large number of splines 54 which are spline-fitted to a large number of splines 49 of the connecting tube 48 in the axial direction of the outside, and the inside of this attachment 53. A large number of splines 58 are formed in the axial direction so as to be spline-fitted to a large number of splines 57 of the input shaft 56 of the work machine 55. The length of the input shaft 56 is extended by connecting the attachment 53 to the input shaft 56.

Further, 59 is a guide body, and this guide body 59 is formed in a cylindrical shape with a size into which the support body 23 is inserted, and an annular bottom plate portion 60 at an inner end portion of the guide body 59 supports the input shaft 56. A plurality of bolts 64 are fixed to a front wall portion 63 of a case body 62 that houses a transmission 61 that is rotatably supported. In addition, the guide body
At the outer end portion of 59, an expanded opening portion 65 is formed which is expanded outward to guide the insertion of the guide body 52.

The case body 62 of the mission 61 is provided at an intermediate portion of the main frame 66 in the left-right direction of the working machine 55, and a chain case 67 and a bracket (not shown) face each other at both ends of the main frame 66. A rotary working body 68 is rotatably provided between the chain case 67 and the lower end of the bracket. The rotary work body 68 is rotatably connected to the mission 61 via an output shaft thereof and an interlocking medium such as a chain of a chain case 67.

Further, a mast 69 is projected from the upper part of the case body 62 toward the upper front side, and an upper hitch metal fitting 70 detachably connected to the upper connecting rod 11 is fixed to a lower part of an upper end of the mast 69. This upper hitch bracket 70 is a short front piece.
An arc-shaped holding portion 73 is formed between the upper portion of 71 and the long rear side piece 72 to form a substantially inverted U-shape with the lower surface opened.

Further, the left and right connecting arms 74, 74 are projected in parallel from both ends of the main frame 66 toward the front,
Lower hitch metal fittings 75, 75 are attached to the tips of the left and right connecting arms 74, 74, respectively. The left and right lower hitch fittings 75, 75 are short front pieces 76, 76 and long rear pieces 77, 77.
The holding portions 78, 78 having an arc shape are formed between the upper portions of and, and are formed in a substantially inverted U shape with the lower surface opened. Further, in the long rear side pieces 77, 77 of the left and right lower hitch metal fittings 75, 75, there is a guide long groove (not shown) long in the vertical direction from the middle part to the lower part.
Are formed respectively.

In addition, the support shafts 79,
The upper ends of lock arms 80 and 80 formed in a substantially C shape at 79 are rotatably attached to the lock arms 80 and 80, respectively.
Locking parts 81,81 protruding toward the front of the lower end of 80,80
Is protruded from the guide long groove into the openings of the holding portions 78, 78 so as to be movable back and forth. Also, the lock arms 80, 80
One end of a coil spring (not shown) wound around the support shaft 79, 79 is locked to the release lever 82, 82 integrally projected at the upper end of the coil spring, and the other end of the coil spring is It is locked to the tip ends of the connecting arms 74, 74.

The lock arms 80, 80 are urged by the coil springs, and the locking portions 81, 81 thereof are always projected from the guide long groove into the openings of the holding portions 78, 78. In the figure, 83 is a cover body covering the upper part of the rotary working body 68, and 84 is a leveling plate.

Further, on the tractor A, the base ends of the left and right lower links 88, 88 are respectively rotated vertically by the mounting shafts 87, 87 on the left and right parts of the rear end of the tractor body 86 on which wheels 85, 85 are rotatably mounted. The left and right lower links 88, 88 are movably attached to the shafts, and insertion holes 89, 89 for inserting the lower pins 3, 3 are formed at the tips of the left and right lower links 88, 88, respectively. Also, the left and right lower links 88,8
Lift rods 91, 91 in the vicinity of the tip of 8 via support shafts 90, 90.
The lower ends of the lift arms 91, 91 are rotatably pivoted, and the upper ends of the left and right lift rods 91, 91 are rotatably pivoted by the tip ends of the lift arms 92, 92, respectively.
The reference numeral 2 is adapted to be vertically rotated around a drive shaft 93 by a hydraulic drive mechanism (not shown) of the tractor body 86.

A base end portion of a top link 95, which is adjustable in expansion and contraction, is pivotally attached to a connecting frame 94 of the tractor body 86 by a support shaft 96 in a vertically rotatable manner, and the connecting pin is attached to a tip end portion of the top link 95. An insertion hole 97 for inserting 8 is formed. Then, the left and right lower links 88, 88, lift rods 91, 91,
A suspension mechanism 98 for raising and lowering the connecting frame 1 by the lift arms 92, 92 and the top link 95 is configured.
In the figure, 99 is a seat provided on the tractor body 86.

 Next, the operation of the above embodiment will be described.

Rotate the front mounting holes 4, 4 in the left and right connecting plates 2, 2 of the connecting frame 1 and the insertion holes 89, 89 in the front end portions of the left and right lower links 88, 88 of the tractor A with the lower pins 3, 3. While being movably connected, the insertion holes 9, 9 of the pair of frame bodies 7, 7 of the top 6 of the connection frame 1 and the insertion hole 97 at the tip of the top link 95 of the tractor A are connected to each other by the connection pin 8 Connect rotatably with. Further, the connection cylinder 44 of the universal joint 42 at one end of the power transmission shaft 39 supported by the joint support mechanism 30 of the connection frame 1 is spline-fitted to the power extraction shaft 45 of the tractor A. At this time, the universal joint at one end of the power transmission shaft 39
The outer yoke 43 of 42 is spline-fitted in phase with the outer yoke 47 of the universal joint 46 at the other end.

As a result, the connecting frame 1 is suspended up and down by the top link 95 of the tractor A and the left and right lower links 88, 88, and the joint support mechanism 30 of the connecting frame 1 attaches to the power takeoff shaft 45 of the tractor A. The other end of the power transmission shaft 39, one end of which is interlockingly connected, is supported so as to be vertically movable. Due to the weight of the power transmission shaft 39, the other end portion of the power transmission shaft 39 has the left and right guide long grooves 18, 1 of the connection frame 1.
Left and right movable plates 26, 26 having left and right support rods 19, 19 supported at the lower end of 8 and left and right guide rollers 27, 27 supported at the lower ends of the left and right guide long grooves 25, 25 of the connecting frame 1. And the connecting cylinder 48 at the other end of the power transmission shaft 39 is supported horizontally.

Next, the rear side of the attachment 53 is spline-fitted to the input shaft 56 of the mission 61 of the work machine 55, so that the attachment 53 is integrally connected and projected in front of the input shaft 56. Also, this attachment 53
The guide body 59 is fitted to the bottom plate portion 60 of the guide body 59.
The guide body 59 is fixed to the front side portion of the case body 62 by abutting the front wall portion 63 of the case body 62 of the mission 61 and tightening a plurality of bolts 64 from the bottom plate portion 60 to the front wall portion 63. The outer periphery of the attachment 53 is covered by the guide body 59 to ensure safety, and the expansion opening 65 of the attachment 53 is opened forward.

Next, if necessary, the hydraulic drive mechanism of the tractor A is operated to vertically rotate the left and right lower links 88, 88 by the lift arm 92 and the lift rod 91 about the mounting shafts 87, 87 at the base end. The connecting frame 1 suspended by the left and right lower links 88, 88 and the top link 95 is rotated up and down.
Then, the support 23 of the universal joint 46 of the power transmission shaft 39 horizontally supported by the joint support mechanism 30 of the connecting frame 1 on the working machine 55 side is connected to the input shaft of the working machine 55.
Set it so that it faces the attachment 53 protruding from 56.

Then, when the tractor A is moved backward toward the working machine 55, the guide body 52 at the tip of the support body 23 of the universal joint 46 on the working machine 55 side of the power transmission shaft 39 extends from the expansion opening 65 of the guide body 59. While being inserted and inserted in the guide body 59, the connecting cylinder 48 in the support body 23 is spline-fitted to the attachment 53 via the splines 49 and 54, respectively, and the support body 23 is inserted in the guide body 59 and again in the connecting cylinder. The attachments 53 are fitted deeper into the respective 48.

In this case, that is, in the case where the guide body 52 at the tip of the support body 23 is eccentrically abutted against the expanded opening portion 65 of the guide body 59 and the connecting cylinder 48 and the attachment 53 are decentered, the tractor In the backward movement of A, the guide body 52 of the support body 23 abuts on the expansion opening portion 65, and is gradually slid in the axial direction along the expansion opening portion 65 of which the diameter is reduced in the axial direction of the attachment 53 and is pushed in. The guide body 52 is fitted into the guide body 59 following the expansion opening 65, and the axes of the connecting cylinder 48 and the attachment 53 are automatically aligned with each other. To be done.

Further, when the connecting cylinder 48 is spline-fitted to the attachment 53 with the shaft center displaced downward, the support body 23 is gradually moved upward by the guide body 52 engaged with the expansion opening portion 65. At the same time, the left and right support rods 19, 19 of the joint support mechanism 30 supporting the support body 23 are moved upward along the guide long grooves 18, 18 and the guide long grooves 25, 25 in a horizontal state, thus The body 23 is smoothly spline fitted in the guide body 59. Further, by moving the support member 23 upward, one or both universal joints of the power transmission shaft 39 are
42, 46 can be bent as necessary to accommodate it, and support 2
The movement of 3 is not hindered by the power transmission shaft 39.

Next, the top connecting rod 1 of the connecting frame 1 suspended from the top ring 95 of the tractor A and the left and right lower links 88, 88.
Top ring 95 with 1 being opposed to upper hitch metal fittings 70 of working machine 55 and left and right lower connecting rods 5 and 5 of connecting frame 1 being opposed to lower left and right hitch metal fittings 75 and 75 of working machine 55, respectively.
The upper connecting rod 11 of the connecting frame 1 is rotated by raising and rotating the connecting frame 1 by the left and right lower links 88, 88.
Is the upper hitch metal fitting 70 of the working machine 55, and the left and right lower connecting rods 5, 5 of the connecting frame 1 are the left and right lower hitch metal fittings 7 of the working machine 55.
It is connected to 5,75 respectively.

At this time, the support body 23 is deeply spline-fitted into the guide body 59, and the connecting cylinder 48 is deeply spline-fitted to the attachment 53, so that the guide body 52 of the support body 23 comes into contact with the heads of the plurality of bolts 64 of the guide body 59. Also, the upper connecting rod 11 of the connecting frame 1 is on the long rear side piece 72 of the upper hitch metal fitting 70 of the working machine 55, and the lower connecting rods 5, 5 of the connecting frame 1 are the left and right lower hitch metal fittings 75 of the working machine 55. ,
When the long rear side pieces 77, 77 of 75 are not in contact with each other, the tractor A is further moved toward the working machine 55.

When the work machine 55 is moved backward, the power transmission shaft 39 is contracted, and the left and right guides integrated with the connecting frame 1 are provided along the left and right support rods 19 and 19 of the joint support mechanism 30 via the guide long grooves 18 and 18. The plates 15 and 15 are moved backward, and the left and right guide plates 15 and 15 are
In the reverse drive, the linear ball bearings 28, 28 connected to the left and right movable plates 26, 26 are connected to the coil springs 29, 29.
And is slid rearward along the supporting rods 19 and 19 against each other. Then, the upper connecting rod 11 is connected to the upper hitch metal fitting 70.
The tractor A is moved backward until the left and right lower connecting rods 5, 5 come into contact with the lower portions of the long rear side pieces 77, 77 of the left and right lower hitch fittings 75, 75, respectively.

Next, when the hydraulic drive mechanism of the tractor A is operated and the connecting frame 1 is rotated upward by the top link 95 and the left and right lower links 88, 88, the upper connecting rod of the connecting frame 1 is rotated.
11 is engaged in the holding portion 73 of the upper hitch metal fitting 70, and the left and right lower connecting rods 5, 5 of the connecting frame 1 use the locking portions 81, 81 of the lock arms 80, 80 as coil springs. The lower connecting rods 5, 5 are fitted into the holding portions 78, 78 while being pushed back so as to retract outward from the guide long groove, and at the same time, the lock arm 80 is returned by the restoring force of the coil spring. , 80 are automatically returned and rotated about the spindles 79, 79.

Then, the locking portions 81, 81 are again moved from the guide long groove to the holding portion 7.
The lower connecting rods 5, 5 are locked by the locking parts 81, 81 protruding from the lower surface of the opening of the 8, 78. Therefore, the upper connecting rod 11 is fitted in the holding portion 73 of the upper hitch metal fitting 70, and at the same time, the left and right lower connecting rods 5, 5 are connected to the left and right lower hitch metal fittings 75,
It is fitted and connected to 75.

Next, the handle 35 is pulled out from the locking recess 37 against the coil spring 38 and moved along the guide groove 36, whereby the rotary rod 33 is rotated, and the left and right lock bars of the rotary rod 33 are rotated. 34, 34 are engaged with the front surfaces of the left and right rear stoppers 21, 21 of the joint support mechanism 30. And
By engaging the handle 35 again in the locking recess 37 at a predetermined position, the handle 35 is locked in the locking recess 37 by the biasing force of the coil spring 38, and the rear portions are locked by the left and right lock bars 34, 34. The left and right support rods 19, 19 are locked from moving forward via the stoppers 21, 21. Therefore, the connecting cylinder 48 is prevented from coming out of the attachment 53 due to an unexpected situation such as vibration.

Then, the power from the power takeoff shaft 45 of the tractor A is transmitted to the input shaft 56 of the work machine 55 via the power transmission shaft 39, and further transmitted from the mission 61 to the rotary work body 68,
Plowed soil work is performed by the rotary drive of the rotary work body 68. At this time, the connecting cylinder 48 of the power transmission shaft 39 is rotatably fitted into the support body 23 via the ball bearing 50. Therefore, it can be smoothly rotated without being affected by the support member 23.

(Effect of the Invention) According to the present invention, the joint support mechanism is provided on the connection frame so as to be vertically movable, and the joint portion of the universal joint on the working machine side of the power transmission shaft is rotated by the support body by the joint support mechanism. By supporting the power transmission shaft horizontally freely, the number of steps for aligning the power transmission shaft is different even if the connecting part of the universal joint on the working machine side and the input shaft of the working machine are slightly misaligned. It is possible to automatically align the mutual axis centers of the working machine in reverse and to smoothly couple the two without the need for.

At this time, the joint support mechanism is provided on the connecting frame so as to be movable up and down, so that the universal joint on the working machine side of the power transmitting shaft is fixed as if the universal joint on the working machine side of the power transmitting shaft is fixed to the connecting frame. It is not necessary to rotate and tilt the connecting frame in the front-rear direction in order to align the axis of the connecting portion with the input shaft of the working machine, and the handling operation is easy.

In addition, the joint support mechanism that is vertically movable on the connecting frame rotatably supports the connecting portion of the universal joint on the working machine side of the power transmission shaft. Can be easily connected to the power takeoff shaft of the tractor in its narrow working space.

Therefore, when connecting the tractor and the working machine via the quick coupler, the work of connecting the power take-off shaft of the tractor and the input shaft of the working machine can be reliably and easily performed, and workability and handling are easy. It is possible to provide a transmission device that can reliably transmit the power of the tractor to the working machine.

Further, the input shaft of the working machine has an attachment for spline-fitting the connecting portion of the universal joint on the working machine side, and is covered with a guide body having an expansion opening for guiding the insertion of the support body of the joint support mechanism. By this, the support of the joint support mechanism can be easily inserted into the guide through the expanded opening, and the safety of the connecting portion of the universal joint spline-fitted to the attachment by the guide can be achieved.

[Brief description of drawings]

1 shows an embodiment of the present invention. FIG. 1 is a side view of a power transmission device in which a working machine is connected to a tractor, and FIG.
The drawing is a cross-sectional view taken along the line a-a of the same as above, FIG. 3 is the cross-sectional view taken along the line b-b of the same above, FIG. 4 is the cross-sectional view taken along the line c-c of FIG. 2, and FIG. ~ D line section, FIG. 6 is a cross section of e ~ e line section. 1 ... Connection frame, 15 ... Guide plate, 18 ... Guide long groove,
19 ... Support rod, 23 ... Support, 29 ... Spring, 30 ...
… Joint support mechanism, 39 …… Power transmission shaft, 42 …… Universal joint, 45 …… Power extraction shaft, 46 …… Universal joint, 48 …… Coupling cylinder as a coupling unit, 53…
… Attachment, 55 …… work machine, 56 …… input shaft, 59…
… Guiding body, 65 …… Wide opening, A …… Tractor.

 ─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-62-118807 (JP, A) JP-A-61-96905 (JP, A) JP-A-59-164227 (JP, A)

Claims (2)

(57) [Claims] 1. A connecting frame which is interposed between a tractor and a working machine and connects the tractor and the working machine, a universal joint which is connected to a power take-off shaft of the tractor at one end, and an input of the working machine at the other end. A power transmission shaft provided with a universal joint having a connecting portion for connecting to the shaft, and a joint support for horizontally supporting the connecting portion of the universal joint on the working machine side of the power transmission shaft which is supported by the connecting frame so as to be vertically movable. The joint support mechanism includes left and right guide plates that are fixed to the left and right portions of the connecting frame and have vertical guide slots, and the guide slots of the left and right guide plates are vertically movable and horizontal. -Like support rods in the front-rear direction and the connecting portion of the universal joint on the working machine side, which is fixed between the tip ends of the left and right support rods. The tractor is rotatably mounted and supported horizontally, and the left and right support rods each have a spring that biases the support rod toward the working machine side. Device to do. 2. An input shaft of a working machine is a guide body having an attachment for spline-fitting a connecting portion of a universal joint on the side of the working machine and an expansion opening portion for guiding insertion of a support body of a joint support mechanism. The device for transmitting power of a tractor according to claim 1, which is covered, to a working machine.