JPH0637610Y2 - Coupling device for tractor and work equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a connecting device for detachably connecting a tractor and a working machine with a quick opening means.

(Prior Art) As a device for connecting a tractor and a working machine by one-touch operation, for example, Japanese Patent Laid-Open No. 58-216605 and Japanese Utility Model Laid-Open No. 55-12.
The one described in Japanese Patent No. 3205 is known.

In this conventional apparatus, in addition to connecting the machine body of the working machine to the tractor with one touch, the power transmission device of the tractor and the working machine is also connected with one touch.

That is, in the one described in the above-mentioned Japanese Patent Laid-Open No. 58-216605, the shaft end portion of the output shaft of the rotary power transmission mechanism in which the input side is connected to the power take-off shaft provided on the machine side for conduction is movable. A shaft support of a holding member, and the holding member slides along the axial direction of the output shaft, and is connected to the machine to be attached to the shaft end portion of the input shaft provided on the machine body of the working machine. A handle that is slidably fitted to a machine frame that is installed in this machine or that is supported by the machine frame that is installed in this machine and that is set so as to move in the reverse direction, and its holding member moves in the axial direction. Alternatively, it is a connecting and coupling device for a rotary power transmission mechanism in an agricultural and earthmoving machine, which is characterized by connecting working mechanisms such as a hydraulic mechanism.

In addition, the one described in Japanese Utility Model Publication No. 55-123205 has a quick coupler frame pivotally attached to the rear end of the three-point link hitch via a pin in the vehicle width direction, and a PTO shaft protruding rearward from the rear axle case. The front end of the drive shaft is connected via the universal joint, the rear yoke of the universal joint at the rear end of the drive shaft is supported by the quick coupler frame, and the rear end of the rear yoke and the front end of the work machine input shaft approach in the front-rear direction. The working machine coupling device is characterized in that a clutch to be connected by is provided, and a clamp mechanism that engages with each other by approaching in the front-rear direction is provided between the quick coupler frame and the working machine.

(Problems to be Solved by the Invention) In the conventional device, the supporting portion for rotatably supporting the expansion joint shaft is provided so as not to move vertically with respect to the frame provided on the tractor side. Therefore, there is a problem that it is extremely difficult to center the end portion of the expandable joint shaft and the input shaft of the working machine.

Therefore, an object of the present invention is to provide a connecting device for a tractor and a working machine that solves the above problems.

(Means for Solving the Problems) In order to achieve the above object, the present invention has taken the following means.
That is, the feature of the present invention is that in the device that connects the end portion of the expansion joint shaft connected to the PTO shaft of the tractor and the input shaft of the working machine, it is provided on the tractor side so as to be vertically movable. A frame, a guide rail provided along the front-rear direction on the frame, a front-rear direction and a vertical movement on the guide rail, and rotatably supporting the end of the expandable joint shaft. A support portion, a link plate pivotally attached to the support portion and arranged in the front-rear direction along the guide rail, a pivot member pivotally attached to the link plate, and pivotably supported in the front-back direction on the frame. And a rocking lever that is set.

(Operation) According to the present invention, by swinging the swing lever,
The support portion moves in the axial direction via the link plate, and by this movement in the axial direction, the end portion of the expandable joint shaft and the input shaft of the working machine can be engaged and disengaged.

When the rocking lever is rocked, the rocking lever is connected to the supporting portion via the link plate, so that the vertical displacement due to the arc motion of the rocking lever is absorbed by the link plate, and The force in the vertical direction is not transmitted, and the support is moved only by the force in the axial direction.

Therefore, the centering fitting of the expansion joint shaft and the input shaft is performed extremely smoothly, and the "twisting" phenomenon does not occur in the attaching / detaching operation.

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

As shown in FIG. 1, a rotary tiller 4 is detachably connected to a rear portion of a vehicle body 2 of a tractor 1 through a connecting device 3 according to the present invention.

A hydraulic device 5 is provided on the upper surface of the rear part of the vehicle body 2 of the tractor 1, and the hydraulic device 5 is provided with a pair of left and right lift arms 6 that swing vertically due to hydraulic pressure. A pair of left and right lower links 7 are pivotally supported at lower portions on both sides of the vehicle body 2 so as to be vertically swingable. This lower link 7
And the lift arm 6 are linked by a lift rod 8. A top link 9 is pivotally supported in the upper center of the rear end surface of the vehicle body 2 so as to be vertically swingable. Further, the PTO shaft 10 projects in the lower center of the rear end surface of the vehicle body 2. This P
The TO shaft 10 is rotationally driven by an engine (not shown).
An expansion joint shaft 11 is connected to the PTO shaft 10. The expandable joint shaft 11 has cross joints 12 at both ends thereof, and the cross joints 12 are connected by a splined extendable transmission shaft 13. The transmission shaft 13 is covered with a non-rotatable cover tube (not shown).

As shown in detail in FIGS. 2 and 3, the connecting device 3 has a gate-shaped frame 14, and the frame 14 is formed by bending a square pipe. A pin 15 having a horizontal axis in the left-right direction is provided at the lower left and right ends of the portal frame 14.
Is fixed, and the rear end of the lower link 7 is pivotally attached to the pin 15. A pair of left and right lower connecting plates 16 are fixed to the lower ends of the left and right sides of the frame 14 so as to project rearward. A pair of upper and lower guide surfaces 17 are formed at the rear end of the lower connecting plate 16 so as to widen and open rearward, and the front ends of the upper and lower guide surfaces 17 are connected by an arc surface 18.

A lock plate 19 is pivotally supported on the pin 15 at the lower end of the frame 14 so as to be vertically rotatable. The lock plate 19 is located on the side of the lower connecting plate 16, and an arcuate surface recess 20 having substantially the same diameter as the arcuate surface 18 is formed on the upper surface of the lock plate 19 and the arcuate surface recess A sliding surface 21 is formed from the rear edge of 20 so as to be rearward and downward. When the arcuate surface 18 and the arcuate surface recess 20 are located concentrically, the front edge of the arcuate surface recess 20 closes the space between the open guide surfaces 17.

A rod 22 is pivotally attached to the front portion of the lock plate 19, and the rod 22 is inserted in a U-shaped bracket 23 fixed to the front side surface of the frame 14 so as to be vertically movable.
The rod 22 is constantly urged downward by a spring 24. At the top of this rod 22
Is installed. A locking plate 26 is provided upright on the bracket 23, and a locking recess 27 is formed on the upper surface of the locking plate 26. By pulling the grip 25 upward and engaging the grip 25 with the locking recess 27, the front part of the lock plate 19 is fixed in the downward pivoting position, and the lock plate 19 is a space between the guide surfaces 17. Open up. Also grip 25 and locking recess
By releasing the engagement of 27 and moving the rod 22 downward by the spring 24, the lock plate 19 closes the space between the guide surfaces 17, and the arcuate surface 18 and the arcuate surface recess 20 are concentric.

An upper connecting plate 28 is fixed to a central portion of an upper portion of the frame 14, and a rear end of the top link 9 is pivotally attached to a front portion of the upper connecting plate 28. An engaging recess 29 having an upper opening is provided at the rear of the upper connecting plate 28.

The middle portions of the left and right sides of the gate frame 14 in the up-down direction are connected by a horizontal rod 30, and a pair of left and right brackets 31 are fixed to the horizontal center of the horizontal rod 30 so as to project downward. The guide rails 32 are fixed to the pair of left and right brackets 31 in the front-rear direction and in parallel with each other. The guide rail 32 has a U-shaped cross section, and the U-shaped grooves are arranged so as to face each other.

On the other hand, as also shown in FIG. 4, the cross joint 12 at the rear end of the expandable joint shaft 11 is rotatably supported by a cylindrical supporting portion 33 via a bearing 34. A pair of roller support plates 35 are fixed to both sides of the lower portion of the outer peripheral surface of the support portion 33 so as to extend forward. In this roller support plate 35,
A pair of front and rear lower rollers 36 are rotatably attached via pins 37. An arm 38 is swingably supported on the pin 37, and an upper roller 40 is also pivotally supported on the upper end of the arm 38 via a pin 39. The pair of front and rear arms 38 are arranged in an inverted eight shape, and a tension spring 41 is stretched between the arms 38.

The lower roller 36 and the upper roller 40 are positioned in the U-shaped groove of the guide rail 32 and roll on the inner surface of the guide rail 32 in the front-back direction. In the state shown in FIG. 4, the axial center of the cross joint 12 and the longitudinal center line of the guide rail 32 are parallel to each other.

A pair of left and right link plates 42 are pivotally mounted via pins 43 on both upper side surfaces of the outer periphery of the support portion 33 so as to be vertically rotatable. The link plate 42 extends forward along the axis of the cross joint 12.

On the other hand, a pair of left and right brackets 44 projecting forward are fixed to the front surface of the horizontal rod 30 in the center in the left-right direction.
A rotary cylinder 45 is rotatably supported between the shafts 44. A pair of left and right levers 46 is fixed to the rotating cylinder 45 in a hanging shape, and the lower end of the lever 46 is pivotally attached to the front end of the link plate 42. A swing lever 47 is fixed to the rotating cylinder 45 so as to project upward. The upper end of the swing lever 47 is bent to the left and right to form a grip portion 48.

A U-shaped bracket 49 is fixed to the swing lever 47 at an intermediate portion in the vertical direction, and a lock rod 50 parallel to the swing lever 47 is inserted into the bracket 49 so as to be vertically movable. This lock rod 50 is always operated by the spring 51.
It is urged downward. The upper end of the lock rod 50 is bent laterally to form a finger hook portion 52 located below the grip portion 48 of the swing lever 47. The finger rest 52 and the grip
A rotation prevention piece 53 that engages with the rocking lever 47 is fixed to the lock rod 50 so that 48 is always parallel.

The lower end of the lock rod 50 engages with the positioning hole 55 of the positioning plate 54 fixed to the bracket 44 in a disengageable manner. That is, the positioning plate 54 is an arc surface concentric with the rotating cylinder 45.
56, and a large number of the positioning holes 55 are formed in the circular arc surface 56 at predetermined intervals in the circumferential direction.

A plate 57 protruding upward is fixed to the support portion 33, and a positioning pin 58 protruding rearward is fixed to a rear surface of an upper end portion of the plate 57. This locating pin 58
Is provided parallel to the axis of the cross joint 12, and the rear end of the positioning pin 58 projects rearward from the rear end surface of the cross joint 12. The rear end of the positioning pin 58 is formed in a taper shape.

A cover 59 is fixed to the pair of left and right link plates 42. This cover 59 is formed in a U-shaped cross section,
Both sides of the upper portion and the upper portion of the support portion 33 and the cross joint 12 are covered. The cover 59 is provided with a hole 60 through which the plate 57 projects. The hole 60 has a size large enough to allow the plate 57 to move in the front-rear direction.

The cover 59 is divided into front and rear from the vicinity of the hole 60,
It is easy to put on and take off. The front cover 59a is fixed to the link plate 42 with bolts 61, and the rear cover 59b is fastened together with the pin 43 pivotally supporting the link plate 42.

The working machine 4 has an input gear box 62, and an input shaft 63 projects from the front surface of the gear box 62. The input shaft 63 is detachably fitted to the spline 64 of the cross joint 12 supported by the support portion 33. Further, a channel member 65 protruding forward is fixed to the upper front portion of the gear box 62. A block 66 is fixed to the front part of the channel material 65, and a positioning hole 67 is formed in the block 66. The positioning hole 67 is a through hole having an axis parallel to the input shaft 63, and the front portion of the positioning hole 67 is a tapered hole 68 that widens forward. This taper hole 68
The front end of the input shaft 63 is located in front of the front end of the input shaft 63. A stop plate 69 is fixed to the channel member 65 at an intermediate portion in the front-rear direction.

The positioning hole 67 allows the positioning pin 58 to be inserted. A stopper plate 69 is provided at a position where the rear end of the positioning pin 58 contacts the stopper plate 69 when the cross joint 12 and the input shaft 63 are properly fitted. Whether or not this contact has occurred can be visually confirmed from the side opening of the channel material 65.

A top mast 70 is fixed to the top of the input gear box 62 so as to project forward, and an upper connecting pin 71 is attached to the front end of the top mast 70. This upper connecting pin 71
The upper connecting plate (28) engages with the engaging concave portion (29) in a disengageable manner.

Support arms on both left and right sides of the input gear box 62
72 is attached, and a lower connecting bracket 73 protruding forward is fixed to the support arm 72. The bracket 73 and the top mast 70 are connected by a connecting rod 74. A lower connecting pin 75 having a horizontal axis in the left-right direction is fixed to the front part of the bracket 73. The lower connecting pin 75 is guided by the guide surface 17 of the lower connecting plate 16,
Moreover, the lock plate 19 is rotated downward by contacting the sliding surface 21 of the lock plate 19, and the arc surface 18 and the arc surface recess are formed.
It is said that 20 can be engaged and disengaged.

The lower connecting bracket 73 has a support for a front gauge wheel 76.
77 is supported so that it can move vertically and be fixed.

Side plates 78 are fixed to both ends of the support arm 72, and a cultivating shaft is supported between lower portions of the both side plates 78, and a rotary cultivating section 79 is provided.
Is formed.

According to the embodiment of the present invention, what is shown in FIGS. 1 and 5 is the working machine connected state, and what is shown in FIG. 3 is the disconnected state.

First, in order to change the state shown in FIG. 3 to the state shown in FIG. 5, the tractor 1 is moved back and the upper connecting pin 71 of the top mast 70 is engaged with the locking recess 29 of the upper connecting plate 28.

Next, the hydraulic device 5 is operated to rotate the lower link 7 upward. By this upward rotation, the frame 14 rises, and by this raising, the upper connecting pin 71 is lifted upward. Since the working machine 4 is lifted by lifting the upper connecting pin 71, the working machine 4 moves forward around the upper connecting pin 71 due to the positional relationship of its center of gravity. By this forward movement, the lower connecting pin 75
Is guided by the guide surface 17 of the lower connecting plate 16, and pushes down the lock plate 19 to engage the arc surface 18, and the arc surface recess 20 of the lock plate 19 prevents the lock plate 19 from coming out backward. Be done.

Then, the machine body of the working machine 4 is the frame of the tractor 1 side.
Connected to 14. In this state, the cross joint 12 and the input shaft 63 are not yet connected. In this state, the axial center of the cross joint 12 is located slightly below the axial center of the input shaft 63. However, the cores in the left-right direction are substantially in agreement.

Next, a hand is put on the grip portion 48 of the swing lever 47, a finger is put on the finger hook portion 52 of the lock rod 50 to pull up the lock rod 50, and the rod 50 is pulled out from the positioning hole 55 of the positioning plate 54.
The swing lever 47 is swung forward.

Due to this swing, the swing cylinder 45 swings, the lever 46 swings backward, and the link plate 42 pivotally supported by the lever 46 is pushed backward. The rearward movement of the link plate 42 causes the support portion 33 to move rearward. At this time, the spline joint portion of the transmission shaft 13 of the expansion joint shaft 11 extends. Since the support portion 33 is guided by the guide rail 32 by the front and rear rollers 36 and 40, the support portion 33 moves rearward in parallel.

Then, first, the rear end of the positioning pin 58 has a tapered hole.
It abuts 68 and its core is aligned. At this time, the support portion 33 moves slightly upward, but the upper roller 40 is
Since it is biased at 41, its upward movement is allowed. Since it is supported by the upper, lower, front and rear rollers 36, 40, the shaft center of the support portion 33 moves upward while maintaining the parallel state.

Then, by further moving the swing lever 47 forward, the positioning pin 58 is fitted in the positioning hole 67, and the spline 64 of the cross joint 12 and the input shaft 63 are fitted concentrically.
Further, when the swing lever 47 is moved forward, the supporting portion 33 is pushed backward via the link plate 42, so that the supporting portion 33 is moved backward in parallel without being twisted in the vertical direction, and the cross joint 12 and the input shaft are completely moved. 63 are combined. In this state, the rear end of the positioning pin 58 abuts on the stopper plate 69 to prevent excessive pushing.

After that, by releasing the finger from the finger hook portion 52 and engaging the lower end of the lock rod 50 with an appropriate positioning hole 55 of the positioning plate 54, accidental movement of the swing lever 47 is prevented, and the cross joint 12 is input. Uncoupling of the shaft 63 is prevented.

The work implement 4 is removed by the reverse procedure of the connecting operation.

In FIG. 6, the rocking cover 47 is positioned by the ratchet teeth 80 and the ratchet pawl 81. The ratchet teeth 80 and the ratchet pawl 81 are disengaged from each other by the push rod inserted into the cylindrical swing lever 47.
82. This push rod 82 has a spring 83
Is always urged upward by.

The present invention is not limited to the above embodiment.

(Effect of the Invention) According to the present invention, the support portion is not directly pivotally attached to the swing lever, but the swing of the swing lever is converted to the movement in the front-back direction via the link plate. The support portion can be moved directly in the front-rear direction, the expansion joint shaft and the input shaft can be fitted very smoothly, and the connecting work can be facilitated.

[Brief description of drawings]

1 is an overall side view showing an embodiment of the present invention, FIG. 2 is a front view, FIG. 3 is a side view showing a state in which a tractor and a working machine are disconnected, and FIG. 4 is an expansion joint shaft. FIG. 5 is a sectional view showing a supporting structure with a supporting portion, FIG. 5 is an enlarged view of an essential part of FIG. 1, and FIG. 6 is a sectional view of another swing lever. 1 ... tractor, 3 ... coupling device, 4 ... work machine, 10 ...
… PTO shaft, 11 …… Expandable joint shaft, 14 …… Frame, 33
…… Supporting part, 42 …… Link plate, 47 …… Rotating lever, 63 …… Input shaft.

Claims (1)

[Scope of utility model registration request] 1. A device for connecting an end portion of an expansion joint shaft (13) connected to a PTO shaft (10) of a tractor (1) and an input shaft (63) of a working machine (3) to the tractor. A frame (14) provided on the (1) side so as to be vertically movable, a guide rail (32) provided along the front-rear direction on the frame (14), and a guide rail (32) on the front-rear direction. A support portion (33) which is provided so as to be movable in the vertical direction and rotatably supports the end portion of the expansion joint shaft (13), and the guide rail (32) pivotally attached to the support portion (33). ), And a swing lever pivotally attached to the link plate (42) and pivotally supported in the frame (14) so as to be swingable in the front-back direction. (47) A device for connecting a tractor and a working machine, comprising: