JP2012235769A - Implement connection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an implement connection device for automatically connecting a pair of connection terminals on the connection frame side to a pair of connection terminals on the implement side when the implement is automatically connected to the connection frame liftably disposed on the rear portion of a tractor, which improves the reliability of the mutual connection of the connection terminals.SOLUTION: The implement connection device is provided with a pair of the connection terminals of a tractor vehicle body side and a pair of connection terminals on the implement side, a pair of fit dent portions and a pair of projection portions which are mutually engaged on the connection of the implement to the connection frame with a pair of the fit dent portions arranged in the lateral direction, and a pair of projection portions arranged in the lateral direction one of a pair of the connection terminals in one of a pair of the right and left fit dent portions, the other connection terminal in the other fit dent portions, one of the other connection terminals in one of the right and left projection portions, and the other of the other connection terminals in the other projection portion.

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, it is conceivable that a connection failure occurs because there is no guide for guiding until the power connector on the work machine side is connected to the power connector on the coupling frame side.
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 connection frame is raised and the work implement is lifted, so that the work implement swings around the axis in the left-right direction around the engaged portion so that the work implement approaches the connection frame and is automatically connected to the connection frame. In the work machine coupling device configured to be
A pair of connection terminals provided on the tractor body side and connected to a power source, and a pair of connection terminals provided on the work machine side and connected to an electrical device are provided,
A pair of insertion recesses and protrusions that fit together when the work implement is connected to the connection frame are provided, the pair of insertion recesses are arranged in the left-right direction, and the pair of protrusions are arranged in the left-right direction. ,
One connection terminal of one pair of connection terminals is provided in one of the left and right insertion recesses, and the other connection terminal of the one pair of connection terminals is provided in the other insertion recess. Provided,
Providing one connection terminal of the other pair of connection terminals on one protrusion of the left and right protrusions and providing the other connection terminal of the other pair of connection terminals on the other protrusion;
When the work equipment is connected, the left and right insertion recesses and the left and right protrusions are fitted together, so that the pair of connection terminals on the tractor body side and the connection terminal on the work equipment side are automatically connected. It is characterized by that.

In the invention which concerns on Claim 2, the working machine side connector provided with the connection terminal by the side of the said working machine is supported to a working machine via an elastic body, and the working machine side connector is moved up and down by the elastic deformation of this elastic body. It is characterized by being swingable.
The invention according to claim 3 is characterized in that the impact force from the front side can be absorbed by the elastic deformation of the elastic body.

The present invention has the following effects.
According to the first aspect of the present invention, the connection between the connection terminals and the connection between the other connection terminals are performed at the same timing when connecting the work machines, so that the connection terminal on the tractor side and the work machine side are connected. The connection terminals can be reliably connected, and the reliability of the connection of these connection terminals can be improved.

According to the invention which concerns on Claim 2, the connection terminal by the side of a tractor and the connection terminal by the side of a working machine can be connected smoothly.
According to the invention which concerns on Claim 3, the impact force at the time of a fitting with an insertion recessed part and a protrusion part can be absorbed.

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 a side view which shows the state before the machine frame of a working machine is connected with 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. (A) is a side view of the power connector on the connection frame side, (b) is a plan view of the power connector on the connection frame side, and (c) is a rear view of the power connector on the connection frame side. It is a front view which shows the attachment state of the power supply connector by the side of a working machine. It is a front view which shows the state which attached the connector case. (A) is a side view which shows the attachment state of a connector case, (b) is a top view which shows the attachment state of a connector case. (A) is the side view which cut the connector case, (b) is the top view which cut the connector case. (A) is side sectional drawing which shows the state before the connection of a power connector, (b) is side sectional drawing which shows the connection middle of a power connector, (c) is a side sectional view which shows the connection completion state of a power connector.

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. 7, the left and right support arms 11 are fixed to the base cylinder portion 11 a that integrally extends from the gear case 10 outward in the left-right direction, and the 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 5, the connecting frame 3 has a main frame member 54 formed in a square shape when viewed from the front 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, 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 connected by a bottom wall 57b. Yes.
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 part 63 is formed with an insertion hole for avoiding interference with the upper part of the rear part 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 collar 80 and the pivot 81 extending from the lower end of the left and right side collar 79 outward in the left-right direction and inserted into the through hole 76 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 operation lever 86 is pulled up, as shown by a solid line 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 rotation center of the swing arm 83. The urging force of the urging spring 73 acts to oscillate the rear part of the lock member 72 upward (located at the center of the pivot 85 that pivotally supports the oscillating arm 83).
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 through 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 tiller 4 is lifted and the rotary tiller 4 is rotated to the tractor vehicle body 1 side around the upper connecting pin 14, and the left and right lower connecting pins 16 are connected to the rear part of the lock member 72 as shown in FIG. The rear part of the lock member 72 is fitted into the fitting part 63 of the left and right fitting receiver 57 while swinging downward against the biasing force of the biasing spring 73.
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.

When the lower connecting pin 16 is fitted into the fitting portion 63, the lower connecting pin 16 is disengaged 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 to lock the lower link pin 16. Locked by 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 cultivator 4 is raised to approach the tractor body 1 and the operation lever 86 is pushed down as shown by the phantom line 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 where the operation lever 86 indicated by the phantom line in FIG. 2 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 spring 73 is attached. The force acts to rotate the swing arm 83 backward about the pivot 85, and the side collar 79 of the interlocking member 78 contacts the intermediate frame member 55, thereby rotating the swing arm 83 backward. Movement is regulated.

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.

In the present embodiment, the work machine side connector 42 is accommodated in a connector case 91 attached and fixed to the machine frame 5, and the connecting frame side connector 41 enters the connector case 91 and enters the work machine side. Connected to the connector 42.
As shown in FIGS. 10 (a) and 10 (b), the work machine side connector 42 has a cylindrical hole shape recessed rearward on the front side of a housing 88 made of insulating synthetic resin or the like. Each of the left and right insertion recesses 89 includes a male connector having a male terminal 90 (connection terminal).

As shown in FIG. 6, the connecting frame side connector 41 is formed of a female member in cylindrical left and right projecting portions 93 integrally formed in a rear projecting manner on the rear surface side of a housing 92 made of insulating synthetic resin or the like. It is comprised with the female connector provided with the terminal 94 (connection terminal).
The projection 93 of the connection frame side connector 41 is fitted into the insertion recess 89 of the work implement side connector 42, whereby the male terminal 90 and the female terminal 94 are connected (the connection frame side connector 41 and the work implement side). The tractor side power supply harness 43 and the work implement side power supply harness 44 are connected to each other (with the connector 42 connected in a straight line).

As shown in FIG. 7, the connector case 91 is arranged on the upper side of the base side cylinder portion 11 a of the right support arm 11 and is fixedly attached to a case bracket 95 fixed to the right connection bracket 15.
As shown in FIGS. 8 to 11, the connector case 91 has a rectangular case-shaped case main body 96, and an entrance / exit 97 for allowing the connecting frame side connector 41 to enter and exit the front wall 96 a of the case main body 96. Have

The entrance 97 of the case body 96 is closed from the inside of the case body 96 by a lid 98. The lid 98 is pivotally supported at its upper end so as to be rotatable about the left and right axis, and swings upward inside the case 91 from the state of closing the doorway 97 shown by the solid line in FIG. Thus, the doorway 97 is configured to open.
The lid body 98 is urged in the closing direction by a torsion coil spring or the like (not shown), and its edge side is in contact with the inner surface of the front wall 96a of the case body 96 in the closed state.

A support wall 99 is provided at the outer rear part of each of the left and right side walls 96b of the case body 96. As shown in FIG. The mounting member 100 is fixedly mounted.
The mounting member 100 includes a front wall 100a fixed to the support wall 99 of the case body 96 with bolts and the like, and upper and lower walls 100b and 100c extending rearward from the upper and lower ends of the front wall 100a. It is formed in an open U-shape toward the rear of the view.

Rubber blocks 101 (elastic bodies) are arranged above and below each of the left and right attachment members 100. The upper rubber block 101 is formed into a rhombus-shaped block whose upper surface is located behind the lower surface, and the lower rubber block 101 is formed into a rhombus-shaped block whose lower surface is located behind the upper surface. .
The lower surface of the upper rubber block 101 is fixed to the upper wall 100b of the mounting member 100, and the lower surface of the lower rubber block 101 is fixed to the lower wall 100c of the mounting member 100.

Support plates 102 are arranged above the upper rubber block 101 and below the lower rubber block 101, and each support plate 102 is fixed to the rubber block 101 on the same side in the vertical direction.
The upper and lower support plates 102 are fixed to a mounting bracket 103 disposed on the back side of the connector case 91 with bolts or the like, and the mounting bracket 103 is fixedly mounted to a support bracket 104 fixed to the case bracket 95.

  Since the connector case 91 is supported via the rubber block 101, the front part of the connector case 91 is indicated by an arrow K in FIG. The rubber block 101 can swing up and down (is swingable), and the rubber block 101 is elastically deformed so that the impact force from the front side acting on the connector case 91 (see arrow F in FIG. 9A). Can be absorbed.

The work machine side connector 42 is disposed at a rear portion in the connector case 91 and is fixed to a back wall 96c of the connector case 91 (case body 96).
In the connector case 91, the connection direction of the connection frame side connector 41 and the work machine side connector 42 (see the B direction in FIG. 11A). In FIG. 11A, the connection direction B is the connection frame connector 41. A long guide guide 105 is provided at (indicating the direction of connection of the work machine side connector 42).

The guide guides 105 are disposed on the left and right sides of the work machine side connector 42, respectively. Each guide guide 105 is composed of a pair of upper and lower guide members 106 (guide rails) arranged to face each other with an interval in the vertical direction.
The upper and lower guide members 106 are arranged in a vertically distributed manner from the vertical center of the work implement side connector 42.

  Each guide guide 105 is formed to be inclined with respect to the connection direction of the connectors 41 and 42 so that the front interval 106a (inlet side guide portion) of the upper and lower guide members 106 gradually increases as the front portion 106a moves forward. The intermediate portion 106b (main guide portion) of the guide member 106 is parallel to the connection direction of the connectors 41 and 42, and the facing interval increases as the rear portion 106c (exit side guide portion) of the upper and lower guide members 106 moves rearward. It is formed to be inclined with respect to the connecting direction of the connectors 41 and 42 so as to gradually spread.

Therefore, the front portion of the guide guide 105 is tapered toward the rear, and the rear portion of the guide guide 105 is tapered toward the front.
In the present embodiment, each guide member 106 is supported by an elastic support member 107 made of a spring plate, and the interval between the upper and lower guide members 105 can be expanded and contracted by the elastic deformation and elastic restoring force of the elastic support member 107. .

In the present embodiment, the guide member 106 and the elastic support member 107 are integrally formed.
The upper elastic support member 107 that supports the upper guide member 106 is formed in an inclined shape in which the front wall 107 a moves upward as it goes from the front end of the guide member 106 to the rear side, and the intermediate wall 107 b is formed on the connector case 91. The rear wall 107c is fixed to the upper wall 96d, and is formed in an inclined shape that moves upward as it goes from the rear end of the guide member 106 to the front side.

The lower elastic support member 107 that supports the lower guide member 106 is formed in an inclined shape in which the front wall 107a moves downward as it goes from the front end of the guide member 106 to the rear side, and the intermediate wall 107b is formed in the connector case. 91 is fixed to the lower wall 96e, and the rear wall 107c is formed in an inclined shape that moves downward from the rear end of the guide member 106 toward the front side.
The elastic support member 107 that supports the upper and lower guide members 106 is not formed by a spring plate, and is formed by another elastic member as long as it can be supported so that the interval between the upper and lower guide members 106 expands and contracts. It may be.

As shown in FIG. 3, the connecting frame side connector 41 is disposed below the right side of the intermediate frame member 55 of the connecting frame 3 and on the right side of the vertical wall portion 58 a of the right support plate 58.
Further, the connecting frame side connector 41 is supported by a connector bracket 108 fixed to the intermediate frame member 55 as shown in FIGS.
As shown in FIGS. 6 and 11, a base plate 109 having a rectangular shape in a rear view is fixed to the rear portion of the connector bracket 108 that supports the connection frame side connector 41, and the connection frame side connector 41 is attached to the back surface of the base plate 109. It is fixed to the rear protruding shape.

The base plate 109 protrudes from the periphery of the connection frame side connector 41, and a seal member 110 is provided along the edge of the base plate 109 on the back side of the protruding portion.
The outer shape of the base plate 109 as viewed from the back is formed in a shape that matches the outer shape of the front wall 96 a of the case body 96 of the connector case 91 as viewed from the front.

Support arms 111 are arranged on the left and right sides of the connection frame side connector 41, respectively. This support arm is disposed at the center in the vertical direction of the connecting frame side connector 41, is formed in a linear strip shape that is long in the connecting direction of the connectors 41 and 42, and the vertical width W1 is formed in the same width in the longitudinal direction. ing.
Each of the left and right support arms 111 is disposed closer to the connection frame side connector 41 than the seal member 110, its front end is fixed to the back surface of the base plate 109, and its rear end side extends rearward from the protrusion 93 of the connection frame side connector 41. It is said to be a warrant.

The vertical width W1 of each support arm 111 is formed to have the same width (or narrower than the interval D) as the interval D between the intermediate portions 106b of the upper and lower guide members 106.
A guided portion 112 that engages with the guide guide 105 (upper and lower guide members 106) is provided at the rear end of each support arm 111 (is integrally formed of the same material).
Each guided portion 112 has a front end side (base end side) formed in a vertical width that is the same as the vertical width W1 of the support arm 111, and gradually increases in width from the front end side toward the middle portion (center) in the front-rear direction. The width is gradually narrowed from the midway part (central part) to the rear end (tip).

Therefore, the front portion of the guided portion 112 is formed in a tapered shape that is tapered toward the front side, and the rear portion of the guided portion 112 is formed in a tapered shape that is tapered toward the rear side. . The vertical width W2 of the midway portion (center portion) that is the maximum vertical width portion of the guided portion 112 is formed to be larger than the interval D between the intermediate portions 106b of the vertical guide member 106.
In the embodiment of the above configuration, as shown in FIG. 4, the rotary tiller 4 is lifted by the connecting frame 3 to connect the rotary tiller 4 to the connecting frame 3, and the machine frame 5 approaches the connecting frame 3. Then, the work machine side connector 42 approaches the connection frame side connector 41 and the connection frame side connector 41 relatively enters (inserts) into the connector case 91, and the rotary tiller 4 is connected to the connection frame 3. At the same time, the work machine side connector 42 is connected to the connecting frame side connector 41.

Before the connection frame side connector 41 relatively enters the connector case 91 and the work implement side connector 42 starts to connect to the connection frame side connector 41, first, the guided portion 112 is moved to the front portion 106a of the upper and lower guide members 106. The guided portion 112 contacts (engages) the front portion 106a of the upper or lower guide member 106.
Then, since the front part of the guide guide 105 and the rear part side of the guided part 112 are tapered toward the rear side, as shown in FIG. By engaging the front portion 106a and the guided portion 112, the work implement side connector 42 is swung so that the connection frame side connector 41 and the work implement side connector 42 face each other in the connection direction, and the connection frame side The work machine side connector 42 is aligned with the connector 41 so that a straight line connection is possible.

Thereafter, when the machine frame 5 approaches the connecting frame 3, the guided portion 112 engages with the upper and lower guide members 106 (guide guides 105), so that the work machine side connector 42 is guided in the connection direction. The work machine side connector 42 is connected to the connecting frame side connector 41.
At this time, the vertical width W2 of the midway portion, which is the maximum vertical width portion of the guided portion 112, is formed to be larger than the interval D between the intermediate portions 106b of the vertical guide member 106, so that it is shown in FIG. As described above, when the guided portion 112 passes between the intermediate portions 106b of the upper and lower guide members 106, the distance between the pair of guide members 106 is pushed against the spring force against the spring force of the elastic support member 107. spread.

  Since the rear portion of the guide guide 105 and the front portion of the guided portion 112 are tapered toward the front side, the guided portion 112 is moved up and down as shown in FIG. The upper and lower guide members 106 are returned to their original positions by the spring force of the elastic support members 107 at the same time as the connectors 41 and 42 are completely disconnected from the intermediate portion 106b of the guide member 106 and the connectors 41 and 42 are completely connected. It is prevented from coming off between the guide members 106.

When the connectors 41 and 42 are connected to each other, the seal member 110 provided on the back surface of the base plate 109 contacts the front wall 96 a of the case body 96 of the connector case 91.
In the configuration described above, the connectors 41 and 42 can be reliably connected to each other by engaging the guided portion 112 and the guide guide 105 (by guiding the guided portion 112 to the guide guide 105). The reliability of connection between the connectors 41 and 42 is improved.

Moreover, since the connection frame side connector 41 penetrates into the connector case 91 and is connected to the work machine side connector 42, water and mud adhere to the connection frame side connector 41 and the work machine side connector 42 during field work. Can be prevented by the connector case 91.
Further, in a state where the connectors 41 and 42 are connected to each other, the guided portion 112 is prevented from coming off between the pair of guide members 106, so that even if the screws for attaching the connectors 41 and 42 are loosened or dropped out. The connectors 41 and 42 can be prevented from separating.

  Further, in the present embodiment, when the connection frame side connector 41 relatively enters the connector case 91, the lid body 98 of the connector case 91 is pressed by the contact portion on the connection frame side connector 41 side. Open automatically. That is, when the work implement side connector 42 approaches the connection frame side connector 41, first, the guided portion 112 contacts the lid body 98 of the connector case 91 and pushes the lid body 98 open. Thereafter, the lid 98 is pressed by the protrusion 93 and the housing 92 of the connecting frame side connector 41 and is pushed open by these.

Therefore, the guided portion 112, the protruding portion 93 of the connection frame side connector 41, and the housing 92 are contact portions that contact the lid body 98 so as to push the lid body 98 to open.
When the connecting frame side connector 41 is withdrawn from the connector case 91, the guided portion 112 contacts the tip end side of the lid body 98, but the upper surface of the support arm 111 and the upper front portion of the guided portion 112 Since the corners are rounded and the tip of the lid 98 is rounded, the lid 98 is smoothly closed without being caught by the guided portion 112.

Thus, the lid body 98 of the connector case 91 is opened by the operation of the connection frame side connector 41 entering the connector case 91 and closed by the operation of the connection frame side connector 41 being retracted from the connector case 91. There is no need to open and close 98 by hand, and there is no need to forget to open / close lid 98.
The present invention is not limited to the above-described embodiment, and various design changes can be made. For example, in the embodiment, the guide guide 105 may be provided in the connection frame side connector 41 and the guided portion 112 may be provided in the work machine side connector 42.

  Alternatively, the connection frame side connector 41 may be accommodated in the connector case 91 and the work implement side connector 42 may be inserted into the connector case 91 and connected to the connection frame side connector 41.

1 Tractor body 3 Connecting frame 4 Working machine (rotary tiller)
14 engaged part (upper connecting pin)
41 power connector on connecting frame side 42 power connector on work machine side 60 engaging portion 91 connector case 96 case body 97 doorway 98 lid 105 guide guide 106 guide member 112 guided portion B connector connection direction

Claims (3)

A connecting frame (3) is mounted on 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 (4) side. The work frame (4) is lifted so that the work machine (4) approaches the connection frame (3) by lifting the work machine (4) by raising the connection frame (3) in a state of being engaged with the engagement portion (14). In the work machine coupling device configured to swing about the left and right axial center around the joint (14) and automatically coupled to the coupling frame (3),
A pair of connection terminals (94) provided on the tractor vehicle body (1) side and connected to the power source, and a pair of connection terminals (94) provided on the work machine side (4) and connected to the electrical equipment (39) ( 90),
When the work machine (4) is connected to the connecting frame (3), a pair of insertion recesses (89) and projections (93) that fit together are provided, and the pair of insertion recesses (89) are provided in the left-right direction. Arrange and arrange a pair of protrusions (93) side by side in the left-right direction,
One connection terminal (90) of one pair of connection terminals (90) is provided in one insertion recess (89) of the left and right insertion recesses (89) and in the other insertion recess (89). Providing the other connection terminal (90) of the one pair of connection terminals (90);
One projection terminal (93) of the left and right projections (93) is provided with one connection terminal (94) of the other pair of connection terminals (94) and the other projection section (93) is provided with the other The other connection terminal (94) of the pair of connection terminals (94) is provided,
When the work implement is connected, the left and right insertion recesses (89) and the left and right protrusions (93) are fitted together, so that the pair of connection terminals (94) on the tractor vehicle body (1) side and the work implement (4) side are connected. A work machine coupling device characterized in that the pair of connection terminals (90) are automatically connected.   A work machine side connector (42) having a pair of connection terminals (90) on the work machine (4) side is supported on the work machine (4) via an elastic body (101), and the elastic body (101) The work implement coupling device according to claim 1, wherein the work implement side connector (42) is swingable up and down by elastic deformation.   The work machine coupling device according to claim 2, wherein an impact force from the front side can be absorbed by elastic deformation of the elastic body (101).

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