JPH02268610A - Agricultural working machine-connecting device - Google Patents

Abstract

PURPOSE:To prevent the deposition of splashed soil to an input shaft by closing the outer peripheral portion of the input shaft with a cylindrical cover attached to a mission case or connecting member projectingly disposed on the input shaft. CONSTITUTION:When a connecting member 65 of an agricultural working machine 53 is connected to a suspension mechanism of a tractor and a connector 38 of a power transmission shaft 27 transmitting the power of the tractor also to a input shaft 61 of the agricultural working machine, a space between the connector 38 and the mission case 60 is closed with a cylindrical cover 74 in a sealed state and the input shaft 61 is also converted with the cover 74.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to an agricultural machine coupling device, and more particularly, to a device for coupling a farm machine to an agricultural tractor and for transmitting the power of the agricultural tractor to the agricultural machine. .

(Prior Art) Conventionally, this type of agricultural machine coupling device includes, for example,
A farm work machine is connected to the three-point suspension mechanism of the tractor, and the other end of the power transmission shaft, which has one end connected to the power take-off shaft of the tractor, is connected to the input shaft of the farm work machine, and the input shaft and the connection part A structure in which a plate-shaped cover body is provided protruding from the upper part has been proposed.

(Problems to be Solved by the Invention) In the above structure, a cover body projects above the connection portion between the input shaft and the other end of the power transmission shaft;
Since this cover body is formed into a plate shape, the lower part and both left and right side parts of the input shaft and this connection part are open, and from this open part, the input shaft and the connection part can be accessed for agricultural work etc. There is a problem in that flying mud and the like cannot enter and adhere to the structure, and the presence of this open portion also causes a problem in that safety is lacking during power transmission.

Therefore, the present invention was made in view of such problems, and it is possible to connect the input shaft and the power transmission shaft coupling body and simultaneously close the outer peripheral part of the input shaft, thereby making it possible to close the input shaft. It is an object of the present invention to provide an agricultural machine coupling device that can reliably solve the problem of adhesion of mud scattered during agricultural work, and can sufficiently ensure safety during power transmission.

[Structure of the invention]

(Means for Solving the Problems) A farm working machine coupling device of the present invention couples a suspension mechanism of a tractor to a coupling part of a farm machine, and a power transmission shaft that transmits power of the tractor to an input shaft of the farm machine. In the agricultural machine coupling device for connecting a coupling body, the coupling body is attached to either one of the transmission case projecting and supporting the input shaft and the coupling body, and the coupling body is coupled to the input shaft and also connected to the mission case. A cylindrical cover body is provided to close off the space between the body and the body.

(Function) In the agricultural machine coupling device of the present invention, a suspension mechanism of a tractor is coupled to a coupling part of a farm machine, and a coupling body of a power transmission shaft that transmits the power of the tractor is coupled to an input shaft of the farm machine. This connects them to each other and transmits the power of the tractor to the agricultural machine. At this time, the connection body and the input shaft are connected, and at the same time, the connection body and the transmission case that has the input shaft are connected. The input shaft is hermetically closed by a cylindrical cover body, and the input shaft is automatically covered over the entire surface without being exposed.

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

In the figure, reference numeral 1 denotes a connecting frame, and this connecting frame 1 is formed by bending a pipe material into a substantially mountain shape, and connecting plates 2 are fixed to opposing lower ends of both sides extending downward. The left and right connecting plates 2 extend in the front-rear direction, and have an engagement recess 3 that opens rearward at their rear ends, and a support shaft 4 and a lower pin at the upper and lower front ends of the left and right connecting plates 2. 5 is projected horizontally. A lock arm 6 is rotatably attached to the left and right support shafts 4, and a hook-shaped locking protrusion 7 that projects into the engagement recess 3 is formed at the rear end of the left and right lock arms 6. A guide surface 8 inclined forward and downward is formed on the outer edge of the locking protrusion 7, and a handle 9 is fixed to the upper front ends of the lock arms 6 on the left and right sides of the bracket. Further, a locking plate 10 is provided on the upper part of the left and right connecting plates 2.
are projected, and stoppers 13 and 14 for locking the handle 9 midway are formed at the front and rear of the outer edge 12 of the horizontal folded piece 11 formed on the upper part of the left and right locking plates 1G. . In addition, springs (not shown) are wound around the left and right support shafts 4, and the left and right lock arms 6 are urged to rotate around the support shafts 4 by the left and right springs, so that the locking protrusions 7 thereof are always engaged. The handle 9 protrudes into the recess 3 and is engaged with a stopper 14 at the rear.

Further, a pair of connecting plates 15 are fixed to the top of the connecting frame 1 facing each other at a predetermined interval, and mounting holes 16.
16 are formed opposite to each other. Further, a hook 17 is fixed to the rear portion of the lower end of the pair of connecting plates 15 and to the rear portion of the top of the connecting frame 1 and projects rearward, and a locking recess 18 is formed in the hook 17. A locking protrusion 19 is formed at the upper rear side of the holder 18 .

Next, a connecting rod 20 is horizontally fixed between the rear upper parts of the left and right connecting plates 2 of the connecting frame 1, and this connecting rod 20
Plate-shaped supports 22 are integrally erected on the left and right sides of the straight rod portion 21 in the middle of the frame, and the front lower ends of the left and right supports 22 are supported by support rods 23 parallel to the straight rod portion 21. Support recesses 24 are formed in the upper end portions of the left and right supports 22 in the vertical direction, and insertion openings 25 opened at the upper portions of the left and right support recesses 24 are inserted into the upper ends of the left and right supports 22. Stopper 2 protruding in the direction to prevent it from coming off
6, the opening is formed with a smaller diameter than the diameter of the support recess 24.

Reference numeral 27 denotes a power transmission shaft, and the power transmission shaft 27 has a connecting inner cylinder 28 and a connecting outer cylinder 29 that are fitted into each other so as to be expandable and retractable only in the axial direction. Tube 29
Universal join 30.3 at the outer end of each
1 are connected, and universal joints 3 at both ends
0.31 has an inner yoke 32 and an outer yoke 33 connected to the outer end of the connecting inner cylinder 28 and the outer end of the connecting outer cylinder 29, and the inner yoke 32 and the outer yoke 33 are rotatably mounted. A hollow cylindrical connecting cylinder 35 is fixed in the axial direction to the outer side of the outer yoke 33, and a spline hole having a large number of splines 36 in the axial direction is formed in the connecting cylinder 35. 37 is formed with an outward opening.

Further, the connecting tube 35 at the universal joint 31 of the connecting outer tube 29 is rotatably inserted and supported in a hollow cylindrical connecting body 38 via a ball bearing 39, and an inner ring 40 of this ball bearing 39 is supported. Connecting tube 35
The outer ring 42 of this ball bearing 39 is fitted and locked in an annular recess 41 formed on the outer periphery of the ball bearing 39.
is fitted and locked to the inner wall portion of the connecting body 38. Further, a guide [J43] widened at the outer edge of the connecting cylinder 35 is opened at the outer opening edge 44 of the connecting body 38, and a plurality of guides 45 are provided on the inner side of the guide [J43]. It is provided. Further, U-shaped support frames 46 are fixed to the left and right parts of the connecting body 38 into which the connecting tube 35 is rotatably inserted, and the vertical plate parts 47 of the left and right support frames 46 are attached to the outer sides of the left and right support frames 46. A support shaft 48 to be inserted into the support recess 24 from the insertion opening 25 of the support body 22 projects horizontally and integrally, and a support shaft 48 with a diameter larger than the insertion opening 25 of the support body 22 is attached to the left and right support shafts 48 . A cylindrical spacer 49 which also serves as a stopper and is large enough to be inserted from the lateral direction is fitted inside the spacer 49 so as to be slidable in the axial direction. A coil spring 52 is wound around the support shaft 48 between it and a washer 51 fixed to the outer end of the support shaft 48, and the spacer 49 is always pressed against the vertical plate portion 47 of the support frame 46 by the coil spring 52. is encouraged to do so.

Reference numeral 53 denotes an agricultural machine, and this agricultural machine 53 has a chain case 55 and a bracket (not shown) attached to opposite ends of a main frame 54 extending in the left-right direction. A rotary work body 56 is rotatably provided between the lower ends, and a cover body 57 covering the upper part of the rotary work body 56 is fixed between the chain case 55 and the bracket.
A ground leveling body 58 is provided at the rear end of 7 so as to be rotatable in the direction of the top. Further, a mission case 60 having a built-in mission 59 is provided in the middle part of the main frame 54, and an input shaft 61 consisting of a spline shaft having a guide groove guided by each guide 45 is provided at the front part of the mission case 60. This input shaft 61 is rotatably protruded and supported toward the front.
is spline-fitted from the guide port 43 of the connecting body 38 into the spline hole 37 of the connecting cylinder 35 from the axial direction, and power is transmitted to the mission 59 by the rotation of the input shaft 61. It has become so. Further, a pair of masts 62 are protruded forward from the upper part of the mission case 60 and are arranged in parallel at a predetermined interval, and the locking recess 18 of the hook 17 and the locking protrusion 19 are located between the tips of the pair of masts 62. An upper engaging pin 63 serving as a connecting portion that releasably engages the upper engaging pin 63 is horizontally suspended. Further, lower arms 64 are protruded forward from both sides of the main frame 54, and lower engagement pins serving as connecting portions are provided at the tips of the left and right lower arms 64 to removably engage in the left and right engagement recesses 3. 65 horizontally protrudes outward.

Reference numeral 66 denotes a tractor, and lower links 68 are rotatably pivoted in the vertical direction at the lower portions of both left and right sides of the rear portion of the tractor body 67, and a lift rod 69 pivoted in the middle of the left and right lower links 68 is connected to the tractor body 67. A top link 71 that can be freely extended and retracted is rotatably attached to the lift mechanism 70 of the tractor body 67, and a top link 71 that can be freely adjusted to expand and contract is pivotably attached to the upper part of the rear part of the tractor body 67.
The power take-off shaft (PT) consisting of a spline shaft is located at the bottom of the rear end of
An O-axis) 72 is rotatably protruded. The left and right lower links 68, the lift rod 69, the lift mechanism 70, and the top link 71 constitute a suspension mechanism 73.

Further, 74 is a cover body, and this cover body 74 is made of an elastic member such as rubber and is formed into a hollow cylindrical shape as a whole, and an annular fitting part 75 that fits into the connecting body 38 is formed at one end thereof. At the same time, an annular engaging part 76 is formed at the other end to be press-fitted to the front engaging part 60a of the mission case 60, and a connection between this engaging part 76 and the fitting part 75 is formed. A bellows portion 77 that can be freely expanded and contracted is formed in between in the front-rear direction. A fitting part 75 at one end of the cover body 74 is fitted to the outer peripheral part of the rear end of the connecting body 38, and the fitting part 75 is connected to the connecting body 38 by a ring-shaped fixture 78. It is integrally fixed to the outer circumferential portion, and the engaging portion 76 at the other end is open toward the rear so that the input shaft 61 can be inserted from the rear.

Reference numeral 79 denotes a cover body made of an elastic member such as rubber that covers the outer circumference of the universal joint 31 between the coupling outer cylinder 29 of the power transmission shaft 27 and the coupling body 38. It is composed of a cover 80 and a rear cover 81. The front cover 80 is formed with an annular attachment portion 82 and a retractable bellows portion 84 connected to the attachment portion 82 via a large diameter portion 83. The bellows portion 84 is fitted and fixed to an annular body 85 rotatably provided at the outer end of the cylinder 29.
is open towards the rear. In addition, the rear cover 8
1 has an annular mounting portion 86 and a large diameter portion 87 on this mounting portion 86.
The mounting portion 8G is fitted to the outer circumferential portion of the front end of the connecting body 38, and the mounting portion 86 has a ring-shaped It is integrally fixed to the outer periphery of the connecting body 38 by a fixture 89, and the bellows portion 88 is fitted into the bellows portion 84 of the front cover 80. And the front cover 80
The outer periphery of the universal joint 1-31 is covered by a cover body 79 consisting of a rear cover 81 and a rear cover 81.

Further, reference numeral 90 denotes a cover body made of an elastic member such as rubber, which covers the outer circumference of the universal joint 30 of the connecting inner cylinder 28 of the power transmission shaft 27.

Next, the operation of the above configuration will be explained.

The tips of the left and right lower links 68 of the tractor 66 are rotatably connected to the left and right lower pins 5 of the connecting frame 1, and the tips of the top link 71 of the tractor 66 are connected to the selected position on the connecting plate 15 of the connecting frame 1. It is rotatably connected to the mounting hole 16 via a connecting pin. As a result, the connecting frame 1 is connected to the three-point suspension mechanism of the tractor 66.
are connected and suspended.

In addition, the connecting tube 35 at one universal joint 30 of the power transmission shaft 27 is connected to the power output shaft 72 of the tractor 66.
At the same time, the outer periphery of this universal joint 30 is covered by one cover body 90, and the other universal joint 31 is covered with the other cover body 79 of this power transmission shaft 27. The connecting body 38 holding the cylinder 35 is connected to the straight rod portion 21 and the support rod 2 between the left and right supports 22 of the connecting frame 1.
Place it on 3. And the left and right supporting frames 46 of the connecting body 38
Grip the flange 50 of the spacer 49 of the support shaft 48 provided on the support shaft 48 and move it outward along the support shaft 48 against the coil spring 52, so that the inner end of the spacer 49 and the support frame 46
A support shaft 48 is exposed between the left and right vertical plate portions 47, and the exposed portions of the left and right support shafts 48 are inserted from above into the support recess 24 through the insertion openings 25 of the left and right supports 22, and the left and right spacers are inserted into the support recess 24 from above. When the grip of 49 is released, the left and right spacers 4
9 is automatically inserted laterally into each support recess 24 along the support shaft 48 by the restoring force of the coil spring 52, and the inner end of this spacer 49 is inserted into the vertical plate portion 47 of the support frame 46. Engaged and locked. As a result, the connecting body 38 is connected between the left and right supports 22 in the large-diameter support recess 24.
The spacer 4 has a diameter larger than that of the insertion port 25 and is supported in a swingable manner via a spacer 49 having a smaller diameter than the spacer 49.
9 is a stopper 2 formed at the lower edge of the opening of the insertion port 25
6 and having this spacer 49.
48 is locked in the support recess 24 via a spacer 49, and is prevented from coming off upward. In this way, the power transmission shaft 27 is rotatably connected and supported between the power take-off shaft 72 of the tractor 66 and the connection frame 1.

Next, the agricultural machine 53 placed at the rear of the tractor 66
As the tractor 66 is moved backward toward the three-point link mechanism, the locking projections 19 on the hooks 17 on the upper part of the connecting frame 1 connected and supported by the three-point link mechanism are opposed to the upper engaging pins 63 of the pair of masts 62 of the agricultural machine 53. , and when the lock arms 6 on the left and right connecting plates 2 at the bottom of the connecting frame 1 oppose the left and right lower engagement pins 65 of the agricultural working machine 53, the tractor 66 stops retreating.

Then, when the lift mechanism 70 of the tractor 66 is actuated to rotate the three-point link mechanism upward, the upward arc movement of the connection 71 node 1 causes the connection frame 1 to rotate upward, and the hook 17 at the top of the connection frame 1 is rotated upward. The locking protrusion 19 first engages with the upper engagement pin 63 of the agricultural working machine 53, and the upper engagement pin 63 is engaged and locked in the locking recess 18,
As this connection frame 1 continues to rotate upward, the agricultural working machine 53 is pulled upward by the hook 17 via the two-part engagement pin 63, and this agricultural working machine 53 is engaged with the hook 17. The tractor is also moved forward on the 6 side centering around the stopped upper engagement pin 63, and the left and right lower engagement bins 65 of the agricultural machine 53 are inserted into the engagement recesses 3 in the left and right connecting plates 2, 2 of the connecting frame 1. is automatically engaged and locked, and at approximately the same time, the other universal joint 31 in the connecting body 38 suspended from the connecting frame 1
The agricultural machine 5 is inserted into the spline hole 37 of the connecting cylinder 35 in the
The input shaft 61 of No. 3 is automatically spline-fitted from the guide port 43 thereof.

Further, as described above, the input shaft 61 is spline-fitted into the connecting tube 35 of the connecting body 38, and the cover body 74 is spline-fitted.
The engaging portion 76 is the front engaging portion 60 of the transmission case 60.
a, and this engaging portion 76 is pressed against the front engaging portion 60a by the restoring force of the bellows portion 77, so that the outer peripheral portion of the input shaft 61 is covered in a sealed state.

In addition, when the left and right lower engagement pins 65 are engaged and locked in the engagement recesses 3 of the left and right connecting plates 2, the guide surfaces 8 of the locking protrusions 7 of the lock arms 6 of the left and right connecting plates 2 The left and right lower engagement pins 65 come into contact, and the left and right lower engagement pins 65 push the engagement protrusion 7, so that the lock arm 6 rotates upward about the support shaft 4 against the spring. The left and right lower engagement pins 65 are fitted into the engagement recess 3, and the lock arm 6 is rotated downwardly about the support shaft 4 by the return force of the spring, and this engagement is completed. The protrusion 7 engages with the rear part of the lower engagement pin 65 so as to close the engagement recess 3 .

In this way, the four-point connecting part on the agricultural machine 53 side is automatically connected to the four-point connecting part on the connecting frame 1- side,
In addition, the space between the coupling body 38 and the transmission case 60 is automatically closed by the cover body 74, and the input shaft 61 is automatically closed.
The outer periphery is covered and protected in a sealed state.

Next, as the tractor 66 advances, the agricultural machine 53 is towed and advanced via the connecting frame 1, and the tractor 66
The power from the power output shaft 72 is transmitted to the transmission 59 via the power transmission shaft 27 and the input shaft 61, and the transmission 59 is connected to the output shaft in the main frame 54 and the chain case 55.
A rotary work body 56, which is interlocked and connected to the mission 59 through the interlocking medium therein, is rotated, and this rotary work body 56 performs work on the ground. During this upward work, the cover body 74, 79, 90 removes mud etc. that are scattered toward the power transmission system by the rotary work body 56.
Therefore, the rotation of the human power shaft 61 is not damaged by mud etc., and the insertion and removal from the connecting body 38 is not made uncertain, and the universal joint 30
The bendability of ゜31 will not be impaired by mud etc.

Next, in the above embodiment, a case will be described in which the annular fitting portion 75 at one end of the cover body 74 that covers the outer circumferential portion of the input shaft 61 is fitted and fixed to the outer circumferential portion of the rear end portion of the connecting body 38. However, the present invention is not limited thereto, and one end of the cover body 74 may be fixed to the front engagement portion Ha of the transmission case 60, as shown in FIG. 5, for example. In this case, an annular flange 91 is formed at one end of the cover body 74 instead of the annular fitting part 75 in the case of the above embodiment, and this flange 91 is connected to the front engagement part 601 of the mission case 6o. It is fixed to the other side by a plurality of bolts 92. As a result, the connecting tube 3 inside the connecting body 38
The input shaft 61 is spline-fitted into the outer opening edge 4 of the connecting body 38, and the engaging portion 76 of the cover body 5
4, and this engaging portion 76 is pressed against the outer opening edge 44 by the restoring force of the bellows portion 77, so that the outer periphery of the human power shaft 61 is covered in a sealed state.

〔Effect of the invention〕

According to the present invention, the input shaft of the agricultural machine and the power transmission shaft coupling body that transmits the power of the tractor to the input shaft are connected, and at the same time, the outer circumference of the input shaft is automatically and reliably closed by the cover body. As a result, it is possible to reliably eliminate the problem of mud that is scattered during agricultural work adhering to the input shaft, and to ensure sufficient safety during power transmission.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a side view of a state in which an agricultural machine is connected to a tractor, Fig. 2 is an enlarged side view with a part cut away showing the same input shaft connected state, and Fig. 3 is a sectional view taken along the line a-a of the same as above, FIG. 4 is a perspective view showing a state in which the connection frame and the connection body are separated from each other, and FIG. It is an enlarged side view. 27...Power transmission shaft, 38...Connection body, 53...Agricultural machine, 6G...Mission case, 61...Input shaft, 63
, 65... Connecting portion, 66... Tractor, 73... Suspension mechanism, 74... Cover body.

Claims (1)

[Claims] (1) In an agricultural machine coupling device that connects a suspension mechanism of a tractor to a coupling part of a farm machine, and also connects a coupling body of a power transmission shaft that transmits power of the tractor to an input shaft of the farm machine, the input shaft A cylindrical cover body is provided which is attached to either one of the transmission case protrudingly supported and the coupling body, connects the coupling body to the input shaft, and closes the gap between the mission case and the coupling body. An agricultural machine coupling device characterized by: