JP2012231705A - Coupling device for working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability of connection between power connectors in a coupling device for a working machine allowing a power connector on a coupling frame side and a power connector on the working machine side to be automatically connected when automatically connecting the working machine to the coupling frame liftably mounted at a rear part of a tractor vehicle body.SOLUTION: In the coupling device for a working machine, a power connector 41 in one side of the coupling frame 3 side or the working machine 4 side is supported so as to recede from a connection position to the other power connector 42, and an interlocking mechanism 98 is provided for making the one power connector 41 recede from the connection position by interlocking with the operation of the working machine 4 to move closer to the coupling frame 3, and making the one connector 41 advance to the connection position to connect with the other connector 42 when the working machine 4 is coupled to the coupling frame 3.

Description

  The present invention relates to a work machine connection device that automatically connects a work machine to a tractor.

2. Description of the Related Art Conventionally, there is a work machine connection device that automatically connects a work machine to a tractor (see Patent Document 1).
The work machine coupling device includes a coupling frame that is mounted on the rear portion of the tractor vehicle body via a link mechanism so as to be movable up and down. An engaging part is provided at the upper part of the connecting frame, and a pair of left and right fitting parts and a locking member are provided at the lower part of the connecting frame.
The work implement is provided with an engaged portion that engages with an engaging portion of the connecting frame, and left and right fitting members that fit into left and right fitting portions of the connecting frame.

  In this work machine connection device, the work frame is lifted so that the work machine approaches the connection frame by lifting the work frame with the engaging portion engaged with the engaged portion. The fitting member is swung around the joint portion so that the left and right fitting members are fitted into the left and right fitting portions, and the locking member is engaged with the fitting member fitted into the fitting portion. Is locked so as not to be disengaged from the fitting portion, whereby the work implement is coupled to the coupling frame.

When the work implement approaches the connecting frame, the fitting member swings the lock member downward to fit the fitting portion, and when the fitting member is fitted to the fitting portion, the lock member swings upward. The locking member is configured to prevent the fitting member from being detached.
Also, as a work machine coupling device for automatically coupling a work machine to a tractor, a work machine in which a power connector on the tractor side and a power connector on the work machine side are automatically connected when the work machine is automatically coupled. There is a connecting device (see Patent Document 2).

  In this work machine coupling device, the connection frame is provided with a power connector connected to a power source provided on the tractor via a harness, and the work machine is provided with an electrical device provided on the work machine via the harness. When the work machine is connected to the connecting frame, the power connector on the work machine side is automatically connected to the power connector on the connecting frame side.

JP 7-184403 A Japanese Patent No. 3661215

  In the work machine coupling device described in Patent Document 2, the power connector on the connection frame side is attached to the connection frame so as not to move in the front-rear direction from the connection position with respect to the power connector on the work machine side. The power connector is attached to the work machine so as not to move in the front-rear direction from the connection position with respect to the power connector on the connection frame side, and at the same time the work machine reaches the connection position to be connected to the connection frame, The connector is connected to the power connector on the coupling frame side.

In addition, since the work implement swings around the engaged portion and approaches the connecting frame and is connected to the connecting frame, the power connector on the work implement side draws an arc locus centering on the engaged portion. The power supply connector on the connection frame side is approached and connected to the power supply connector on the connection frame side.
Normally, since the power connectors are connected in a straight line, the power connector on the work machine side is configured to approach the power connector on the coupling frame side and connect to the power connector on the coupling frame side while drawing an arc locus. It is conceivable that a connection failure occurs.

  Accordingly, in view of the above problems, the present invention provides a work machine in which a power connector on the connection frame side and a power connector on the work machine side are automatically connected when the work machine is automatically connected to the connection frame. An object of the present invention is to provide a work machine coupling device that is intended to improve the reliability of connection between power connectors in the coupling device.

The technical means taken by the present invention to solve the technical problems are characterized by the following points.
According to the first aspect of the present invention, a connecting frame is provided at the rear part of the tractor body so as to be movable up and down, and the engaging part provided on the upper part of the connecting frame is engaged with the engaged part provided on the work machine side. In this state, the work frame is lifted by lifting the work frame so that the work machine swings around the engaged portion so as to approach the work frame and is automatically connected to the work frame. In the work machine connection device configured to automatically connect the power connector provided on the work machine side to the power connector provided on the connection frame side when the work machine is connected to the connection frame,
Support one power connector on the connection frame side or work machine side so as to be retractable from the connection position to the other power connector,
In conjunction with the operation of the work machine approaching the connection frame, the one power connector is retracted from the connection position, and when the work machine is connected to the connection frame, the one power connector is advanced to the connection position and the other An interlocking mechanism to be connected to the power connector is provided.

In the invention which concerns on Claim 2, it fits into the lower part of the said connection frame from the fitting part by which the fitting member provided in the work machine side fits when a work machine is connected with a connection frame, and this fitting part. A locking member for preventing the combined member from being detached,
When the work implement approaches the connection frame, the fitting member swings the lock member downward to fit the fitting portion, and when the fitting member is fitted to the fitting portion, the lock member swings upward. Configured to prevent detachment of the fitting member,
The interlock mechanism moves the power connector on the coupling frame side backward from the connection position when the lock member swings downward, and moves the power connector on the connection frame side to the connection position when the lock member swings upward. It is a thing to let it be.

In the invention which concerns on Claim 3, the said fitting part, a fitting member, and a lock member are provided in a pair on the left and right, and an interlocking member for interlockingly connecting the left and right lock members on the connecting frame is provided.
The interlocking mechanism is provided over the interlocking member and the power connector on the connecting frame side.

The present invention has the following effects.
According to the first aspect of the present invention, when automatically connecting the work machine to the connection frame, when the work machine approaches the connection frame, one power connector is retracted from the connection position, and the work machine is connected to the connection frame. Sometimes the one power connector is configured to advance to the connection position and connect to the other power connector, so that one power connector can be moved linearly and connected to the other power connector, Thereby, the reliability of the connection between the power connectors is improved.

According to the invention of claim 2, the power connector on the connection frame side is advanced and retracted with respect to the connection position in conjunction with the movement of the lock member provided in the connection frame. Since the power connector is advanced and retracted using the lock member, the interlocking mechanism can be simplified.
According to the invention of claim 3, when the power connector on the connecting frame side is interlocked with the movement of the lock member provided on the connecting frame, the interlocking member that interlocks and connects the left and right lock members and the power connector on the connecting frame side. By providing the interlocking mechanism over the distance, the structure of the interlocking mechanism can be further simplified.

It is a side view which shows the state which connected the working machine to the tractor. It is a side view of a connection frame. It is a front view of a connection frame. It is an enlarged view of the lower right part of a connection frame. It is a side view which shows the state which connected the connection frame and the machine frame of the working machine. It is a side view which shows the state before the machine frame of a working machine is connected with a connection frame. It is a front view which shows an interlocking mechanism. It is a front view which shows the attachment state of the power supply connector by the side of a working machine. (A) is a side view of the power connector on the connection frame side, (b) is a rear view of the power connector on the connection frame side, (c) is a front view of the power connector on the work machine side, and (d) is a view on the work machine side. It is a side view of a power connector. It is a side view of a state before a fitting member pushes down a lock member. It is a side view in the state where a fitting member pushed down a lock member. It is a side view of the state where the fitting member was fitted in the fitting part. It is a side view of the connection frame which shows the state where the lock member was held in the state where it was removed from the lower connection pin to the lower part side.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a tractor vehicle body, which is supported by the tractor vehicle body 1 at the rear of the tractor vehicle body 1 via a mounting mechanism 2 such as a three-point link mechanism or a two-point link mechanism. A mounting frame 3 is provided, and the work implement 4 is detachably coupled to the coupling frame 3.

In this embodiment, the side drive type rotary cultivator 4 is illustrated as a working machine.
The rotary tiller 4 includes a machine frame 5 attached to the connecting frame 3, a tiller unit 6 for tilling the soil, a tiller cover 7 covering the tiller unit 6, and farm tools such as a gauge ring and a soil cultivator 8. And a swing support frame 9 to be attached.

The machine frame 5 extends from the gear case 10 at the center in the left-right direction to the left and right sides and attaches the upper part of the transmission case 12 to the extension end of the left support arm 11. The upper part of the side frame is attached to the main structure.
A top mast 13 formed in a bifurcated front and rear shape is provided on the upper portion of the gear case 10 so as to protrude upward, and an upper connecting pin 14 (engaged portion) having a left and right axis at the front upper portion of the top mast 13. Is provided.

As shown in FIG. 8, the left and right support arms 11 are fixed to a base cylinder portion 11 a that integrally extends from the gear case 10 outward in the left-right direction, and an extension end of the base cylinder portion 11 a. A lower connecting pin 16 (fitting member) having a left and right axial center is provided at the front portion of the left and right connecting bracket 15.
The gear case 10 is provided with a PIC shaft 17 for inputting power so as to protrude forward from the front surface thereof.

The tillage unit 6 includes a claw shaft 18 that is rotatably supported around a shaft center in the left-right direction between the lower portion of the transmission case 12 and the side frame, and a plurality of tilling claws 19 attached to the claw shaft 18. Has been.
The power input from the PIC shaft 17 into the gear case 10 is input to the bevel gear transmission mechanism in the gear case 10 and from the bevel gear transmission mechanism to the transmission shaft in the left support arm 11 and the chain transmission mechanism in the transmission case 12. The tillage unit 6 is configured to be rotationally driven by being transmitted to the claw shaft 18 and being rotationally driven.

The tillage cover 7 includes an upper cover 20 that covers the top of the tillage unit 6 and a rear cover 21 that covers the back of the tillage.
The rear cover 21 is pivotally supported on the rear end side of the upper cover 20 so as to be pivotable about the left and right axes via a pivotal support shaft, and can swing up and down about the axis of the pivotal support shaft. Has been.
A support rod 25 is provided across the front bracket 23 provided on the support arm 11 and the rear bracket 24 provided on the back surface of the rear cover 21, and a screw rod (not shown) is inserted into the support rod 25. The screw portion of the stopper 26 that restricts the lower limit of the swing range of the rear cover 21 is screwed together, and the stopper 26 moves in the longitudinal direction of the support rod 25 by rotating the screw rod around the axis. The lower limit position of the swinging range of the rear cover 21 can be adjusted. Therefore, the rear cover 21 can be raised and lowered by rotating the screw rod.

On the front end side of the support rod 25, an operation member 27 that rotates integrally with the screw rod is provided. Further, the rear cover 21 is biased downward (in the direction of grounding) by a biasing force of a biasing spring (not shown) fitted to the support rod 25.
The swing support frame 9 includes a pair of left and right support arms 28 that are long in the front-rear direction, an intermediate connection member 29 that connects an intermediate portion between the left and right support arms 28, and left and right support arms. 28 is mainly composed of a toolbar 30 fixed to the rear end side.

The front end side of each support arm 28 is pivotally connected to the rear portion of the connection bracket 15 so as to be rotatable about the left and right axis, and the swing support frame 9 is swingable up and down around the pivot portion on the front end side. ing.
On the center side in the left-right direction of the tool bar 30, a cultivator 8 is attached via a rotation support shaft 31 so as to be rotatable around the left-right axis.

A height adjusting device 32 for adjusting the height of the tool bar 30 by raising and lowering the swing support frame 9 is provided across the top mast 13 and the intermediate connecting member 29 of the swing support frame 9.
The height adjusting device 32 is pivotally supported on the rear upper part of the top mast 13 so as to be rotatable about a left and right axis, and is pivotable about a left and right axis on a bracket 34 fixed to the intermediate connecting member 29. The movable rod 35 is pivotally supported, and a screw rod (not shown) disposed in the rod holder 33 is provided.

The movable rod 35 has a screw portion that is inserted into the rod holder 33 from the lower end and is screwed into the screw rod. By rotating the screw rod about the axis, the movable rod 35 is moved in the length direction of the rod holder 33. The rocking support frame 9 is raised and lowered by moving forward and backward.
An operation member 36 that rotates integrally with the screw rod in the rod holder 33 is provided on the upper end side of the rod holder 33.

  The cultivator 8 is operated up and down by an unillustrated elevating mechanism provided in the cover member 37. The elevating mechanism has a screw rod and rotates the screw rod around the axis, thereby However, the position can be freely changed between a work position for performing ground work (such as a vertical work) shown in FIG. 1 and a non-work position rotated 180 ° backward from the work position. An operation member 38 that rotates integrally with the screw rod is provided at the front portion of the cover member 37.

The rotary cultivator 4 includes an electric motor 39 (electrical device) that drives a screw rod for raising and lowering the rear cover 21, a screw rod for raising and lowering the swing support frame 9, and a screw rod for raising and lowering the earthenware 8. Equipped.
The output shaft of the electric motor 39 can be fitted to the operating members 27, 36, and 38 that rotate together with the screw rod so as to be integrally rotatable, and the operating members 27, 36, and 38 are rotated by the electric motor 39. Rotate screw 杆.

The electric motor 39 is supplied with electric power from a power source such as a battery installed in the tractor, and a switch for driving the electric motor 39 is provided in the vicinity of the driver's seat of the tractor.
The power supply path from the power source to the electric motor 39 is provided in the connection frame side power connector 41 (referred to as the connection frame side connector) provided in the connection frame 3 and the machine frame 5 of the rotary tiller 4. A work machine side power connector 42 (referred to as a work machine side connector) detachably connected to the connection frame side connector 41, a tractor side power supply harness 43 for connecting the power source and the connection frame side connector 41, The work machine side power supply harness 44 is connected to the motor 39 and the work machine side connector 42.

  A PTO shaft 45 projects from the rear surface of the tractor vehicle body 1 at the lower rear surface. Further, on the rear portion of the tractor vehicle body 1, a pair of left and right lift arms 47 whose front portions are rotatably supported by support shafts 46 having left and right axial centers are provided. The left and right lift arms 47 are hydraulic cylinders. The lifting / lowering cylinder 48 is expanded and contracted to swing up and down around the support shaft 46.

The three-point link mechanism 2 includes an upper top link 49 and a pair of lower left and right lower links 50, and a front link bracket 51 provided on the upper rear surface of the tractor vehicle body 1 on the front end side of the top link 49. The front end side of the left and right lower link 50 is pivotally connected to the lower part of the base side of the rear axle case 52 provided on the rear side surface of the tractor vehicle body 1.
The upper part of the lift rod 53 is pivotally connected to the rear part of the left and right lift arms 47, and the lower part of the left and right lift rods 53 is pivotally connected to the middle part of the left and right lower links 50.

The connecting frame 3 is attached to the rear end side of the top link 49 and the left and right lower links 50, and the connecting frame 3 can be raised and lowered via the three-point link mechanism 2 by swinging the lift arm 47 up and down. Has been.
As shown in FIGS. 2 to 6, the connecting frame 3 has a main frame member 54 formed in a front view mountain shape by a square pipe, and the main frame member 54 is disposed at the upper and lower intermediate portions of the main frame member 54. An intermediate frame member 55 is provided to connect the left and right side portions.

A hook 56 is provided at the top of the main frame member 54, and fitting receivers 57 are provided at the left and right lower ends of the main frame member 54. The left and right fitting receivers 57 are supported by an intermediate frame by a support plate 58. It is connected to the material 55.
The hook 56 is provided with a top link pin 59 pivotally connected to the rear end side of the top link 49 on the front side, and the upper connection pin 14 provided on the top mast 13 of the rotary tiller 4 on the rear side from below. It is formed in a hook shape so that it can be hooked.

An open groove portion 60 is an engaging portion that can engage the upper connecting pin 14 from below toward the upper portion of the hook portion at the rear portion of the hook 56.
As shown in FIG. 3, FIG. 10, etc., each fitting receiver 57 has a pair of left and right side walls 57a fixed to the left and right lower ends of the main frame member 54, and the lower front part of the left and right side walls 57a is the bottom wall 57b. Are connected by

The rear upper ends of the left and right side walls 57a of the fitting receiver 57 are connected by a rear upper wall 57c, and a recess 61 that is recessed from the rear to the front is formed in the upper and lower middle portions of the left and right side walls 57a. Has been.
A reinforcing plate 62 formed in a U shape along the recess 61 is provided between the recesses 61 of the left and right side walls 57a. The rear surface side of the reinforcing plate 62 is a fitting portion 63 into which the lower connecting pin 16 of the rotary tiller 4 can be fitted from the rear side.

On the rear end side of the lower wall of the reinforcing plate 62, a contact wall 64 extends downward.
The fitting receiver 57 is open on the rear side of the bottom wall 57b on the upper surface side, front surface side, and lower surface side.
Lower link pins 65 to which the rear end sides of the left and right lower links 50 are connected are respectively arranged on the outer sides in the left and right direction of the fitting portions 63 of the fitting receivers 57. The lower link pins 65 are arranged on the outer surface of the outer side wall 57a. It is fixed via the plate.

In addition, a reinforcing plate 66 to be inserted into the front upper part of the fitting receiver 57 is fixed to the left and right lower ends of the main frame member 54.
A pair of left and right support plates 58 are provided, and a vertical wall portion 58a whose upper end is fixed to the intermediate frame member 55 and a lower end of the vertical wall portion 58a extend outward in the left-right direction, and the extension side end portion is fitted. It is formed in an L shape from the lateral wall portion 58 b fixed to the receiving member 57.

A joint holder 67 is supported between the vertical wall portions 58a of the left and right support plates 58 so as to be rotatable about the left and right axes. The joint holder 67 is provided with a yoke on the rear end side of the joint shaft 68 (universal joint) via a bearing. 69 is rotatably supported.
A PIC shaft 17 is spline-fitted to the yoke 69 so as to be detachable, and a PTO shaft 45 of a tractor is spline-fitted to the yoke 70 on the front end side of the joint shaft 68. From the PTO shaft 45 via the joint shaft 68 Thus, power is transmitted to the PIC shaft 17.

The joint holder 67 is provided with a regulating portion 71 that regulates downward swing.
A lock member 72 and an urging spring 73 composed of a torsion coil spring are incorporated between the left and right side walls 57a of each fitting receiver 57.
The lock member 72 is formed of a plate material, and is open upward on the rear upper surface side to engage with the lower connecting pin 16 fitted into the fitting portion 63 of the fitting receiving member 57 from the lower side to prevent the locking. The recess 74 is formed in a hook shape.

The locking member 72 is rotatably fitted on a left and right support shaft 75 provided between the left and right side walls 57 a of the fitting receiver 57 at the middle part in the front and rear direction, and the left and right direction between the left and right side walls 57 a of the fitting receiver 57. A through hole 76 is formed on the inner side, and is formed in the front portion so as to penetrate in the left-right direction.
The reinforcing plate 62 forming the fitting portion 63 is formed with an insertion hole 77 for avoiding interference with the rear upper portion of the lock member 72.

  The left and right lock members 72 are linked and linked by a linkage member 78, and the left and right lock members 72 move in conjunction with each other. The interlocking member 78 is formed of a bar (round bar) or the like, and connects the inclined left and right side flanges 79 that move inward in the left-right direction and the upper ends of the left and right side flanges 79 as they go upward. From the connecting flange 80 and the pivot 81 extending from the lower end of each of the left and right side flanges 79 outward in the left-right direction and inserted into the through hole 77 of the lock member 72 from the inner side in the left-right direction, has a substantially mountain shape in front view. Is formed.

The connecting collar 80 and the pivot 81 of the interlocking member 78 have a horizontal axis.
Each of the left and right urging springs 73 is disposed on the inner side in the left-right direction of the lock member 72 and is fitted onto the support shaft 75, one end of which is in contact with the lower end of the reinforcing plate 66, and the other end of the interlocking member 78. It is in contact with the upper surface of the pivot part 81 and urges the front part of the lock member 72 and the interlocking member 78 downward.
The upper part of the rear end side of the lock member 72 is a guide surface 82 that is inclined forward and upward. When the guide surface 82 is pressed by the lower connection pin 16 when the rotary tiller 4 is connected, the lock member 72 is locked. The rear part of the member 72 can escape downward against the biasing force of the biasing spring 73.

The upper part of the swing arm 83 is fitted on the central part of the connecting member 80 of the interlocking member 78 in the left-right direction so as to be rotatable about the axis, and the lower part of the swing arm 83 is the intermediate frame member 55 of the connection frame 3. A pivot 84 is pivotally supported by a bracket 84 fixed to the bracket.
An operation lever 86 is fixed to the swing arm 83, and the operation lever 86 can be operated from the driver seat side of the tractor when the rotary tiller 4 is raised.

In the state in which the operating lever 86 is pulled up, as shown in FIG. 2, the swing arm 83 is inclined forward, and the axis A of the side collar 79 of the interlocking member 78 is the center of rotation (swing of the swing arm 83). The urging force of the urging spring 73 acts to swing the rear portion of the lock member 72 upward.
At this time, the stopper portion 87 at the lower rear end side of the lock member 72 comes into contact with the lower end of the contact wall 64 of the reinforcing plate 62 and the upward swinging of the rear portion of the lock member 72 is restricted. Further, in this state, the upper part of the rear part of the lock member 72 has entered the fitting path of the lower connecting pin 16 to the fitting part 63.

The case where the rotary tiller 4 is connected to the connecting frame 3 having the above-described configuration will be described. The tractor vehicle body 1 is positioned in front of the rotary tiller 4 and the tractor vehicle body 1 is moved backward with the lower link 50 lowered. At this time, the operation lever 86 is kept pulled up.
Then, when the hook 56 reaches the lower side of the upper connecting pin 14, the backward movement is stopped, the lift arm 47 is swung upward, and the connecting frame 3 is raised via the three-point link mechanism 2, as shown in FIG. In this manner, the engaging portion 60 of the hook 56 is engaged with the upper connecting pin 14 and the upper connecting pin 14 is hooked by the hook 56 and scooped up.

As a result, the rotary cultivator 4 is lifted and the rotary cultivator 4 is rotated around the upper connecting pin 14 toward the tractor body 1 side, and the left and right lower connecting pins 16 are locked as shown in FIGS. The locking member 72 abuts against the guide surface 82 at the rear of the member 72 and swings downward against the biasing force of the biasing spring 73 to fit into the fitting portion 63 of the left and right fitting receiver 57.
At this time, the PIC shaft 17 of the rotary tiller 4 is spline-fitted to the yoke 69 on the rear end side of the joint shaft 68.

As shown in FIG. 12, when the lower connecting pin 16 is fitted into the fitting portion 63, the lower connecting pin 16 is detached from the rear portion of the lock member 72, and the rear portion of the lock member 72 is moved upward by the biasing force of the biasing spring 73. Thus, the lower connecting pin 16 is locked by the lock member 72.
In this way, the rotary tiller 4 is automatically connected to the connection frame 3 in the connection state shown in FIG.

Next, when the rotary tiller 4 is separated from the connection frame 3 (the tractor vehicle body 1), it is performed as follows.
First, the rotary tiller 4 is raised to approach the tractor vehicle body 1 and the operation lever 86 is pushed down as shown in FIG.
Then, the swing arm 83 is rotated rearward about the pivot 85 and the interlocking member 78 is pulled upward. As a result, the front part of the lock member 72 is pulled up and the rear part of the lock member 72 is centered on the support shaft 75. And swings downward from the lower connecting pin 16 to the lower side.

In the state in which the operation lever 86 shown in FIG. 13 is pushed down, the axis A of the side collar 79 of the interlocking member 78 is located behind the pivot center of the swing arm 83, so that the biasing force of the biasing spring 73 does not swing. The movable arm 83 acts to pivot backward about the pivot 85, and the side flange 79 of the interlocking member 78 contacts the intermediate frame member 55, thereby restricting the pivoting of the swing arm 83 to the rear. Is done.
As a result, the lock member 72 is held in a state in which the rear portion thereof is disengaged downward from the lower connecting pin 16.

Then, the connecting frame 3 is lowered, the rotary tiller 4 is grounded, the fitting receiver 57 is removed from the lower connecting pin 16, and then the hook 56 is removed from the upper connecting pin 14.
In the present embodiment, when the rotary tiller 4 is connected to the connecting frame 3 when the rotary tiller 4 is connected to the connecting frame 3, the connecting frame side connector 41 and the work machine side connector 42 are connected. Are configured to connect automatically.

The work machine side connector 42 is fixed to the machine frame 5 so as not to move at a connection position with respect to the connection frame side connector 41.
The connection frame side connector 41 is supported by the connection frame 3 so as to be retractable from a connection position with respect to the work machine side connector 42 and to be advanced from the retracted position to the connection position (returnable to the connection position).
The connection position of the work machine side connector 42 is a position that can be connected to the connection frame side connector 41 when the rotary tiller 4 is connected to the connection frame 3, and is a position in the machine frame 5. In addition, the connection position of the connection frame side connector 41 is a position at which the connection between the rotary tiller 4 and the work machine side connector 42 when the rotary tiller 4 is connected to the connection frame 3, and the position at the connection frame 3.

As shown in FIGS. 8, 9 (c) and 9 (d), the work machine side connector 42 is recessed rearwardly on the front side of a housing 88 made of an insulating synthetic resin or the like. It is comprised by the male connector provided with the male terminal 90 (connection terminal) in each insertion recessed part 89 of right and left of a cylindrical hole shape.
The work machine side connector 42 is disposed on the upper side of the base side cylinder portion 11 a of the right support arm 11 and is fixedly attached to a connector bracket 91 fixed to the right connection bracket 15.

As shown in FIGS. 9 (a) and 9 (b), the connecting frame side connector 41 has a columnar shape integrally formed in a rearward projecting manner on the rear surface side of a housing 92 made of insulating synthetic resin or the like. It is constituted by a female connector provided with female terminals 94 (connection terminals) in the left and right protruding portions 93.
The protruding portion 93 of the connecting frame side connector 41 is fitted into the fitting recess 89 of the work implement side connector 42, whereby the male terminal 90 and the female terminal 94 are connected, and the tractor side feed harness 43 and the work implement side feed are supplied. The harness 44 is linearly connected.

The connecting frame side connector 41 is disposed on the outer side in the left-right direction above the vertical wall portion 58 a of the right support plate 58 of the connecting frame 3, and the lower surface of the intermediate frame member 55 and the vertical wall portion 58 a of the right support plate 58. Is supported by the guide rail 95 fixed to the upper part of the machine so as to be receded linearly (movable back and forth) from the connection position to the work machine side connector 42.
An attachment wall 96 is formed on the front surface side of the connection frame side connector 41, and a pin hole 97 is formed through the attachment wall 96 in the left-right direction.

In addition, as shown in FIGS. 2, 5 to 7, and 10 to 12, the connection frame side connector 41 is interlocked and connected to the interlocking member 78 (lock member 72) via the interlocking mechanism 98.
The interlocking mechanism 98 includes an interlocking lever 99 that interlocks with the movement of the interlocking member 78, and a connecting link 100 that interlocks and connects the interlocking lever 99 and the connecting frame side connector 41.
The interlocking lever 99 is constituted by a bell crank formed by bending a belt plate material into an L shape, and the bent portion is pivotally supported by a bracket 101 fixed to the front surface of the intermediate frame member 55 so as to be rotatable around a left and right axis via a pivot 102. Has been. A pivot 102 for pivotally supporting the interlocking lever 99 is provided concentrically with the pivot 102 for pivotally supporting the swing arm 83.

  The interlocking lever 99 has a first arm portion 103 extending from the pivot 102 toward the front upper side and a second arm portion 104 extending from the pivot 102 toward the front lower side, and the distal end side of the first arm portion 103 is The coupling member 78 is externally fitted to the coupling flange 80 so as to be rotatable about the axis, and the distal end side of the second arm unit 104 is pivotally coupled to the front end side of the coupling link 100 via a pin 105. .

The rear end side of the connection link 100 is pivotally connected to the pin hole 97 of the mounting wall 96 of the connection frame side connector 41 via the pin 106.
As shown in FIGS. 2 and 10, the connection frame side connector 41 is located at a connection position with respect to the work machine side connector 42 when the operation lever 86 is pulled up.
Then, in order to connect the rotary tiller 4 to the connecting frame 3, the rotary tiller 4 is lifted by the connecting frame 3 so that the rotary tiller 4 approaches the connecting frame 3, and as shown in FIG. When the rear part of the lock member 72 is pushed down, the interlocking member 78 is pushed up by the front part of the lock member 72, so that the first arm part 103 of the interlocking lever 99 swings backward and the second arm part 104 swings forward. Then, the connecting link 100 is moved forward. As a result, the connecting frame side connector 41 moves backward (moves forward) along the guide rail 95 from the connection position with respect to the work implement side connector 42.

  As shown in FIG. 12, when the lower connecting pin 16 is fitted into the fitting portion 63, the rear portion of the lock member 72 swings upward and the interlocking member 78 is pulled down by the front portion of the lock member 72. Then, the first arm portion 103 of the interlocking lever 99 swings forward, the second arm portion 104 swings backward, and the connecting link 100 is pushed backward. As a result, the connecting frame side connector 41 moves forward (rearward movement) from the retracted position to the connection position with respect to the work implement side connector 42 and is connected to the work implement side connector 42.

Therefore, the lock member 72 is engaged with the lower connection pin 16 fitted to the fitting portion 63 so that the rotary tiller 4 is connected to the connection frame 3, and at the same time, the connection frame side connector 41 retracted from the connection position. Advances to the work implement side connector 42 and is connected to the work implement side connector 42.
That is, in this embodiment, the connection between the connection frame side connector 41 and the work machine side connector 42 is not performed at the same time when the rotary tiller 4 is connected to the connection frame 3. The connection frame side connector 41 and the work machine side connector 42 are connected with a delay of one tempo.

  In addition, the work implement side connector 42 is not connected to the connecting frame side connector 41 in an arcuate locus as in the prior art, but in the present embodiment, it is located at the connecting position and does not move. The connection frame side connector 41 is linearly approached in the connection direction and connected to the work machine side connector 42 provided in the rotary tiller 4. Thereby, the reliability of connection between the connection frame side connector 41 and the work implement side connector 42 is improved.

In the present embodiment, the connecting frame side connector 41 is moved back and forth with respect to the connection position in conjunction with the locking member 72 provided in the connecting frame 3, that is, the locking member 72. Since the connecting frame side connector 41 is retracted / returned using this, the interlocking mechanism 98 can be simplified.
Further, when the connecting frame side connector 41 is moved back and forth in conjunction with the lock member 72, in the present embodiment, the interlocking member 78 that interlocks the left and right lock member 72 and the connecting frame side connector 41 are interlocked. Therefore, the interlocking mechanism 98 can be further simplified.

Further, when the rotary cultivator 4 is moved away from the connection frame 3, as shown in FIG. 13, the connection frame side connector 41 is interlocked with the downward swing of the lock member 72 by pushing down the operation lever 86. Retreats from the work machine side connector 42.
In this embodiment, the work machine side connector 42 is fixed at the connection position, and the connection frame side connector 41 is supported so as to be retractable / returnable from the connection position. However, the connection frame side connector 41 is not limited thereto. Is fixed at the connection position, the work implement side connector 42 is retracted in conjunction with the operation of the work implement approaching the connecting frame 3, and the work implement side connector 42 is advanced when the work implement is connected to the connecting frame 3. You may make it connect with the connection frame side connector 41. FIG.

  In addition, although the rotary tiller 4 was illustrated as a working machine (implement) attached to a tractor, it is not limited to this, If it is a working machine provided with electric equipments, such as an electric motor, a sensor, and a light. Anything may be used (for example, scraping harrow, fertilizer spreader, seeder, etc.).

1 Tractor body 3 Connecting frame 4 Working machine (rotary tiller)
14 engaged part (upper connecting pin)
16 Fitting member (lower connecting pin)
41 power connector on connecting frame side 42 power connector on work machine side 60 engaging portion 63 fitting portion 72 lock member 78 interlocking member 98 interlocking mechanism

Claims (3)

A connecting frame (3) is provided at the rear part of the tractor vehicle body (1) so as to be movable up and down, and an engaging part (60) provided on the upper part of the connecting frame (3) is provided on the work machine side. In the state engaged with (14), the connecting frame (3) is raised and the work implement (4) is lifted, so that the work implement (4) approaches the connection frame (3). 14) swings about the center and is automatically connected to the connecting frame (3). When the working machine (4) is connected to the connecting frame (3), it is provided on the working machine (4) side. In the working machine coupling device configured to automatically connect the power connector (42) to the power connector (41) provided on the coupling frame (3) side,
One power connector (41) on the connection frame (3) side or the work machine (4) side is supported so as to be retractable from the connection position with respect to the other power connector (42),
In conjunction with the operation of the work implement (4) approaching the connecting frame (3), the one power connector (41) is retracted from the connection position and the work implement (4) is connected to the connecting frame (3). A work machine coupling device characterized in that an interlocking mechanism (98) is provided, which sometimes moves the one power connector (41) to a connection position and connects it to the other power connector (42). The fitting part (16) provided in the working machine (4) side fits in the lower part of the connection frame (3) when the work machine (4) is connected to the connection frame (3). 63) and a lock member (72) for preventing the fitting member (16) from being detached from the fitting portion (63),
The fitting member (16) is fitted to the fitting portion (63) by swinging the lock member (72) downward when the work machine (4) approaches the connecting frame (3), and the fitting is performed. When the member (16) is fitted into the fitting portion (63), the lock member (72) swings upward to prevent the fitting member (16) from being detached,
When the lock member (72) swings downward, the interlocking mechanism (98) moves the power connector (41) on the connecting frame (3) side backward from the connection position, and the lock member (72) swings upward. The work machine coupling device according to claim 1, wherein the power connector (41) on the coupling frame (3) side is moved forward to the connection position. A pair of left and right fitting portions (63), a fitting member (16) and a locking member (72) are provided, and an interlocking member (78) for interlockingly connecting the left and right locking members (72) to the connecting frame (3) is provided.
The work machine coupling device according to claim 2, wherein the interlocking mechanism (98) is provided across the interlocking member (78) and the power connector (41) on the coupling frame (3) side.

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