JP4909309B2 - Work machine coupling device - Google Patents

Description

  The present invention relates to a work machine connection device for connecting a work machine such as a rotary tiller to a tractor.

Conventionally, there is one described in Patent Document 1 as a work machine connecting device for connecting a work machine such as a rotary to a tractor.
This work machine connection device includes a connection frame for connecting the work machine to the other end of the three-point link mechanism pivoted at one end on the rear part of the tractor vehicle body, and a joint for interlocking and connecting the PTO shaft and the PIC shaft. A joint holder for holding a work implement side joint portion of the shaft is provided, and an upper engagement portion that engages with an upper engagement pin provided on the machine frame of the work implement from below is provided on the upper portion of the connection frame. On both the left and right sides of the lower part of the tractor, there are provided pin connection devices to which the lower engagement pins provided on the machine frame of the work implement are connected from the rear side, and the three-point link mechanism is moved up by the tractor work implement lifting hydraulic device. The connection frame is raised and the upper engagement portion of the connection frame is engaged with the upper engagement pin of the work machine from the lower side, and the connection frame is further lifted to lift the work machine. Swing so that it is close to the tractor side around the mating pin Then, the lower engaging pin of the work implement is engaged and connected to the pin connection device of the connection frame from the rear side, and the PIC shaft of the work implement is connected to the connection frame via the joint holder. It is comprised so that it may be automatically connected with the work machine side joint part.

In addition, in this conventional work machine coupling device, the joint holder is detachably attached to the coupling frame, and the work machine side joint portion of the joint shaft is jointed in a bearing insertion posture in which the PIC shaft can be received from the rear side. Joint holder mounting means for holding the holder is provided.
The joint holder mounting means includes a swing fulcrum portion and a positioning portion provided in the joint holder, and a support plate provided in the connection frame and supporting the joint holder.

The support plate is formed with an engaging groove having a fulcrum receiving portion for receiving the swing fulcrum so that the joint holder swings up and down around the swing fulcrum.
Further, on the front side of the support plate, a positioning receiving portion for receiving a positioning portion provided in the joint holder is provided in a forward projecting shape, and when the positioning receiving portion receives the positioning portion of the joint holder, The downward swing of the joint holder around the swing fulcrum is restricted, and the joint holder is held in the bearing insertion posture.
The positioning receiving portion is formed in an open shape upward, and the positioning portion can be detached from the positioning receiving portion by moving the swing fulcrum portion to the relief portion formed in the middle in the vertical direction of the front edge of the engagement groove. It is configured as follows.

The engaging groove is provided with an insertion port for removably inserting the swing fulcrum part into the engagement groove, and the swing fulcrum part is inserted with the positioning part being detached from the positioning receiving part. It is comprised so that it can be made to detach | leave from an engagement groove | channel via an opening | mouth.
JP 2001-238505 A

In the conventional work machine coupling device, the positioning receiving portion is provided as a forward projecting shape on the front side of the support plate, and the positioning receiving portion is positioned in the middle in the vertical direction of the front edge of the engagement groove. Since the relief part for separating from the front is formed in a concave shape toward the front, the support plate is wide in the front-rear direction, and consists of a swing fulcrum part, a positioning part, a support plate, and an engagement groove The joint holder mounting means is large in the front-rear direction.
Therefore, the present invention provides a work machine coupling device capable of detachably mounting the joint holder to the coupling frame and compactly configuring the joint holder mounting means for maintaining the posture of the joint holder in the front-rear direction. The purpose is to do.

The technical means taken by the present invention in order to solve the technical problem includes a connecting frame for connecting a work machine to the other end of a three-point link mechanism whose one end is pivotally attached to the rear part of the tractor body. A joint holder for holding the work machine side joint portion of the joint shaft that interlocks and connects the PTO shaft and the PIC shaft;
The joint holder is provided with a swing fulcrum portion and a positioning portion that are removably inserted into an engagement groove provided on the connecting frame side,
Provided on the lower end side of the engagement groove is a fulcrum receiving portion for receiving the swing fulcrum portion so that the joint holder swings up and down around the swing fulcrum portion;
The positioning groove is located above the swinging fulcrum and contacts the front edge of the engaging groove with the engaging groove formed vertically long and the swinging fulcrum supported by the fulcrum support. Thus, it is configured to restrict downward swinging around the swinging fulcrum portion of the joint holder.

Also, engage the upper movement restricting part that restricts the upward movement of the positioning part while the positioning part is in contact with the front edge side of the engaging groove and the downward swinging around the swinging fulcrum part of the joint holder is restricted. It is good to provide in the groove.
When the joint holder is swung upward around the swing fulcrum from the state where the positioning portion is in contact with the front edge of the engagement groove and the downward swing around the swing fulcrum of the joint holder is restricted. It is preferable that the positioning portion is in contact with the rear edge side of the engaging groove so that upward swinging around the swing fulcrum portion of the joint holder is restricted.

  In addition, an insertion port for removably inserting the swing fulcrum portion and the positioning portion into the engagement groove is provided in an open shape toward the rear side in the middle in the vertical direction on the rear edge side of the engagement groove. Good.

  According to the present invention, the swing fulcrum part and the positioning part are inserted and accommodated in one engagement groove provided on the connecting frame side, and the joint is formed around the swing fulcrum part on the lower end side of the engagement groove. Provided with a fulcrum receiving part for receiving the oscillating fulcrum part so that the holder oscillates up and down, further forming the engagement groove long vertically, and receiving the oscillating fulcrum part on the fulcrum receiving part, Since the positioning part is located above the swinging fulcrum part and is in contact with the front edge side of the engaging groove, it is configured to restrict downward swinging around the swinging fulcrum part of the joint holder. Thus, the joint holder mounting means for detachably mounting the joint holder and maintaining the posture of the joint holder can be configured compactly in the front-rear direction.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 2, reference numeral 1 denotes a work machine connecting device mounted on the rear portion of the vehicle body 2 of the tractor, and 3 denotes a work machine exemplified as a rotary tiller connected to the work machine connecting device 1.
On the rear upper surface of the tractor vehicle body 2 is mounted a working equipment lifting / lowering hydraulic device 4 equipped with a single-acting hydraulic cylinder, and on the rear surface side of the tractor vehicle body 2 is a PTO shaft 5 that outputs power from the engine projecting backward. Is provided.
The rotary tiller 3 projects a support arm 8 to the left and right from a gear case 7 in which a PIC shaft 6 for inputting power is provided to project forward, and fixes the upper portion of the transmission case 9 to the outer end of the left support arm 8. A machine frame 13 is formed by fixing the upper part of the side frame to the outer end of the right support arm 8, and the lower part of the machine frame 13 is rotatable between the lower part of the transmission case 9 and the side frame about the left and right axis. It has a tilling portion 12 in which a large number of tilling claws 11 are attached to a supported nail shaft 10.

The power input to the PIC shaft 6 is transmitted to the claw shaft 10 via a power transmission member in the gear case 7, the left support arm 8, and the transmission case 9, and the claw shaft 10 is rotationally driven.
Further, a top mast 14 is fixed on the gear case 7, and a connecting bracket 15 projecting forward and backward is fixed to each of the left and right support arms 8.
An upper engagement pin 16 having a horizontal axis is provided on the front upper end side of the top mast 14, and a lower engagement pin 17 having a horizontal axis is provided on each of the left and right connection brackets 15. Yes.

The work machine coupling device 1 includes a three-point link mechanism 18 whose one end side (front end side) is pivotally attached to the rear portion of the tractor vehicle body 2, and the other end side (rear end side or work machine side) of the three-point link mechanism 18. A joint frame 19 for stylizing the three-point link mechanism 18, a joint shaft 20 for interlockingly connecting the PTO shaft 5 and the PIC shaft 6, and a joint portion on the work machine side of the joint shaft 20. The three-point link mechanism 18 having a joint holder 22 that is held at 19 has a top link 23 at the top in the center in the left-right direction and a pair of lower links 24 at the bottom in the left-right direction. 23F is pivotally connected via a pin to a top link bracket 25 fixed to the back surface of the hydraulic device 4 for raising and lowering the work implement so as to be pivotable about a horizontal axis, and a front connecting portion 24F of the left and right lower link 24 is Body 2 Is pivotally connected to a lower link bracket 26 provided at a lower portion of the side surface through a pin so as to be rotatable about a lateral axis.

The middle part in the front-rear direction of the left and right lower links 24 is connected to the left and right lift arms 27 of the working equipment lifting / lowering hydraulic device 4 via lift rods, and the top arm 23 and the lower link are moved by swinging the lift arms 27 upward. 24 is configured to swing up and down around the front connecting portions 23F and 24F, so that the connecting frame 19 moves up and down.
As shown in FIGS. 1 to 4, the connecting frame 19 includes a main frame member 28 formed in a mountain shape in a rear view by a square pipe (or a round pipe, a flat bar, or the like). The left and right lower sides are connected to each other by a left and right reinforcing frame member 29 made of a square pipe or the like.

Further, an upper bracket 30 is fixed to the center upper portion of the main frame member 28, and a lower bracket 31 is fixed to each of the left and right lower ends, so that the middle part in the left-right direction of the reinforcing frame member 29 and the left and right lower brackets 31 are connected. They are connected by a pair of left and right support members 32.
The upper bracket 30 has a rear connection portion 23R of the top link 23 pivotally connected to the front upper portion via a pin, and an upper engagement portion 33 is formed at the rear portion. It is formed in an open concave shape and can be engaged with the upper engagement pin 16 of the work machine from below.

The lower bracket 31 is provided with a lower link pin 34 protruding outward in the left-right direction, and a rear link portion 24R of the lower link 24 is pivotally connected to the lower link pin 34.
A lower engagement portion 35 is formed at the rear portion of the lower bracket 31, and the lower engagement portion 35 is formed in a rear opening concave shape so that the lower engagement pin 17 of the work implement can be engaged from the rear side. Yes.
Further, the lower bracket 31 is provided with a lock member 36 that engages with the lower engagement pin 17 engaged with the lower engagement portion 35 so that the engagement pin 17 cannot be detached from the lower engagement portion 35. The lock member 36 is configured to automatically engage with the lower engagement pin 17 when the lower engagement pin 17 is engaged with the lower engagement portion 35 from the rear side.

Further, the lock member 36 is connected to an operation lever 37 supported by the reinforcing frame member 29 by an interlocking member (not shown), and the lock member 36 is engaged with the lower engagement pin 17 by the operation of the operation lever 37. Can be released and can be held in the released state.
The support member 32 is formed by bending a band plate material into an L shape, and is arranged so that the plate thickness coincides with the left and right direction, and the upper end side is fixed to the lower surface of the reinforcing frame member 29; The vertical wall 38 includes a horizontal wall 39 extending outward in the left-right direction and having an outer end in the left-right direction fixed to the lower bracket 31.

The joint shaft 20 is provided with a universal joint 40 connected to the PTO shaft 5 on the front side, a universal joint 41 connected to the PIC shaft 6 on the rear side, and a space between the front and rear universal joints 40, 41. A telescopic transmission shaft 42 is provided.
The universal joints 40 and 41 have a yoke 43 that is spline-fitted and connected to the PTO shaft 5 or the PIC shaft 6.
The joint holder 22 connects the yoke 43 to the connecting frame 19 so that the PIC shaft 6 can be fitted and connected to the yoke 43 (working machine side joint portion) of the universal joint 41 on the working machine side of the joint shaft 20 from the rear side. A spline hole 44 into which the PIC shaft 6 is spline-fitted is formed in the yoke 43.

The joint holder 22 includes a cylindrical body 45 positioned on the front side between the vertical walls 38 of the left and right support members 32 of the connecting frame 19. The cylindrical body 45 has openings on both sides in the axial direction and has openings. The bearings 46 are disposed inside the cylindrical body 45, and the yoke 43 is supported on the bearings 46 so as to be rotatable around the axis of the spline hole 44.
Further, a guide having a guide hole 47 that is formed in a taper shape with a diameter decreasing toward the front side (spline hole 44 of the yoke 43) and guides the PIC shaft 6 to the spline hole 44 at the rear portion of the cylindrical body 45. A portion 48 is provided.

On both left and right sides of the cylindrical body 45, support portions 49 extending from the side surface of the cylindrical body 45 to the rear side are provided, and the rear portions of the left and right support portions 49 of the left and right support members 32 on the same side in the left-right direction. A support shaft 50 is integrally formed on the rear side of each of the left and right support portions 49 and extends outward in the left-right direction (toward the vertical wall 38). Or, it is formed separately and fixed).
The lower side of a bracket 51 made of a plate material or the like is fixed to the left and right outer ends of the left and right support shafts 50. The left and right brackets 51 are close to the inner surface in the left and right direction of the vertical wall 38 on the same side in the left and right direction. The left and right brackets 51 are arranged (or contacted), and the left and right brackets 51 are engaged with the inner surface of the vertical wall 38 on the same side in the left and right direction, thereby positioning the joint holder 22 in the left and right direction. Made.

In addition, the left and right brackets 51 can suppress the occurrence of twisting.
Each of the left and right support shafts 50 penetrates through the bracket 51 and protrudes outward from the bracket 51 in the left-right direction, and the portion of the support shaft 50 protruding from the bracket 51 has a left and right axis. In this embodiment, a bush 53 (or a roller) is externally fitted to the swing fulcrum portion 52 (the bush 53 may not be provided).
On the other hand, a vertical engagement groove 54 is formed in the vertical wall 38 of each of the left and right support members 32 of the connection frame 19, and the swing fulcrum portion 52 of the joint holder 22 is inserted into the engagement groove 54.

The lower edge of the engaging groove 54 is formed in an arc shape, and serves as a fulcrum receiving part 55 for receiving the oscillating fulcrum part 52. In the embodiment, the joint holder 22 (the work machine side yoke 43) is supported so as to be swingable up and down around the axis of the swing fulcrum portion 52 (therefore, the joint is engaged through the bush 53). (The cylindrical body 45, the support portion 49, and the bracket 51 of the holder 22 swing around the swing fulcrum portion 52).
In addition, a positioning portion 56 made of a pin that protrudes outward from the bracket 51 in the left-right direction is provided at the upper part of each of the left and right brackets 51. The positioning portion 56 is formed in the engaging groove 54. Has been inserted.

As shown in FIG. 1, the positioning portion 56 is located above the swing fulcrum portion 52 with the swing fulcrum portion 52 being received by the fulcrum support portion 55 and is located at the front edge of the engagement groove 54. By contacting the front contact portion 57, the downward swing of the joint holder 22 is restricted, so that the rear end side (working machine side) yoke 43 of the joint shaft 20 can receive the PIC shaft 6 from the rear side. The joint holder 22 is configured to be held in the bearing insertion posture.
Further, the groove forming portion on the front edge side of the engagement groove 54 of the vertical wall 38 is extended from the front contact portion 57 toward the rear side rather than the lower side, and the positioning portion 56 is located on the front side of the engagement groove 54. In the state of being in contact with the contact portion 57, the upper side of the groove forming portion on the front edge side of the engagement groove 54 protrudes above the positioning portion 56, and the upper portion of the positioning portion 56 However, the upward movement of the positioning portion 56 is restricted in a state where the positioning portion 56 contacts the front contact portion 57 of the engaging groove 54 and the downward swinging of the joint holder 22 around the swinging fulcrum portion 52 is restricted. It is set as the upward movement control part 58 which does.

When the joint holder 22 (worker side yoke 43) swings upward from the state where the positioning portion 56 is in contact with the front contact portion 57 of the engagement groove 54, FIG. As indicated by an imaginary line, the positioning portion 56 contacts the rear contact portion 59 on the rear edge side of the engagement groove 54, so that upward swinging of the joint holder 22 around the swing fulcrum portion 52 is restricted. It is configured as follows.
Therefore, the positioning portion 56 can be moved between the front contact portion 57 and the rear contact portion 59, and the joint holder 22 can be swung up and down within the movement range of the positioning portion 56.

As described above, since the left and right brackets 51 are engaged with the left and right inner surfaces of the vertical wall 38 on the same side in the left and right direction, the joint holder 22 is positioned in the left and right direction. The swing fulcrum part 52 and the positioning part 56 are structured so as not to be removed from the engaging groove 54 in the left-right direction.
Therefore, an insertion port 60 that is open toward the rear side by notching the engagement groove 54 and the outside so as to communicate with the outside is provided in the vertically middle part on the rear side of the vertical wall 38 of the support member 32. The swing fulcrum part 52 and the positioning part 56 can be inserted into and removed from the engaging groove 54 through the insertion port 60 (the insertion port 60 is connected to the swing fulcrum part 52 and the positioning part 56). It can also be said to be the exit point.)

The insertion port 60 is provided between the fulcrum receiving portion 55 and the rear contact portion 59.
The joint holder 22 is detachably attached to the connecting frame 19 with the swing fulcrum portion 52, the positioning portion 56, the vertical wall 38, the engagement groove 54, and the insertion port 60, and the joint holder 22 is brought into a bearing insertion posture. A joint holder mounting means for holding is configured.
In order to insert the joint holder 22 into the engaging groove 54, as shown in FIG. 5, the joint holder 22 is inclined downward and inclined forward, and the positioning portion 56 is inserted into the insertion port 60 from the rear side of the vertical wall 38. Then, the positioning part 56 is moved to the upper part of the engaging groove 54.

As shown in FIGS. 6 and 7, when the swing fulcrum 52 comes to a position corresponding to the insertion port 60, the joint holder 22 is swung upward and moved slightly upward around the positioning portion 56. The swing fulcrum part 52 is inserted into the engagement groove 54 from the insertion port 60.
At this time, the upper part of the front edge of the engagement groove 54 is preferably a guide.
When the swinging fulcrum part 52 is inserted into the engaging groove 54, the joint holder 22 is moved downward to fit the swinging fulcrum part 52 to the fulcrum receiving part 55 and to receive the positioning part 56. Contact the front contact portion 57.

Thereby, the joint holder 22 is held in the bearing insertion posture.
The upper side of the engaging groove 54 is a relief 61 when the swing fulcrum 52 is inserted / removed through the insertion port 60.
In the conventional one, when the joint holder is in the bearing insertion posture, the positioning portion can be detached upward from the positioning receiving portion. Therefore, when the work machine is not connected to the connection frame, There is a high possibility that the joint holder is detached from the connection frame due to vibrations or vibrations when working with another working machine mounted on the tractor by a mounting means other than the connection frame.

  On the other hand, in the working machine connection device 1 of the present embodiment, when traveling without attaching the rotary tiller 3, or other than being attached to the tractor without attaching the work device to the working machine connection device 1 When the joint holder 22 vibrates up and down when working with the working machine, the upward movement restricting portion 58 restricts the upward movement of the positioning portion 56, thereby restricting the upward movement of the joint holder 22. The upward swinging of the joint holder 22 is restricted by the positioning portion 56 coming into contact with the rear contact portion 59, and the movement of the joint holder 22 is restricted thereby. When the joint holder 22 vibrates without mounting, the joint holder 22 is not easily detached.

Further, since the insertion port 60 is provided on the rear edge side of the engaging groove 54, when the joint holder 22 swings upward around the swing fulcrum 52 and moves upward, the swing fulcrum 52 is It is difficult to remove from the insertion port 60.
To connect the rotary tiller 3 to the tractor vehicle body 2 in the work machine coupling device 1 having the above-described configuration, first, as shown in FIG. The tractor vehicle body 2 is moved backward so that the upper engagement portion 33 is positioned below the upper engagement pin 16 of the rotary tiller 3, and then the connection frame 19 is raised by the working machine lifting / lowering hydraulic device 4 to The upper engaging pin 16 is scooped up by the engaging portion 33 and the rotary tiller 3 is lifted.

Then, the rotary cultivator 3 swings forward (to the tractor vehicle body 2 side) about the upper engagement pin 16 and approaches the connecting frame 19, and the left and right lower engagement pins 17 are the left and right lower engagement portions 35. Fit from behind.
At this time, the lock member 36 automatically engages with the lower engagement pin 17 and is prevented from being detached from the lower engagement portion 35 of the lower engagement pin 17.
On the other hand, the PIC shaft 6 of the rotary cultivator 3 is inserted into the rear yoke 43 of the joint shaft 20 from the rear side, and the PTO shaft 5 and the PIC shaft 6 are interlocked and connected via the joint shaft 20.

As described above, the rotary tiller 3 (work machine) is automatically connected to the tractor vehicle body 2 via the work machine connecting device 1.
When the PIC shaft 6 is inserted into the rear yoke 43 of the joint shaft 20, the positioning portion 56 is positioned between the front contact portion 57 and the rear contact portion 59 (see FIG. 3). .
In the present embodiment, the vertical wall 38 of the support member 32 of the connection frame 19 is a support member (a member forming the engagement groove 54) that supports the joint holder 22. A support member fixed by bolts or welding may be provided on the vertical wall 38, and the engagement groove 54 may be formed in the support member.

It is side surface sectional drawing of a joint holder and its support part. It is the side view which showed the state before a working machine was mounted | worn with a working machine coupling device. It is a side surface schematic block diagram of the mounting part of the state which mounted | wore with the working machine. It is a rear view of a connection frame. It is a side view which shows the attachment procedure of a joint holder. It is a side view which shows the attachment procedure of a joint holder. It is a side view which shows the attachment procedure of a joint holder.

Explanation of symbols

2 Tractor body 3 Rotary tiller (work machine)
5 PTO shaft 6 PIC shaft 18 Three-point link mechanism 19 Connecting frame 20 Joint shaft 22 Joint holder 43 Work machine side joint (yoke)
52 oscillating fulcrum part 54 engagement groove 55 fulcrum receiving part 56 positioning part 58 upward movement restricting part 60 insertion slot

Claims (4)

A connecting frame (19) for connecting the work machine (3) is provided on the other end of the three-point link mechanism (18) whose one end is pivotally attached to the rear portion of the tractor vehicle body (2), and a PTO shaft (5) A joint holder (22) for holding the work machine side joint portion (43) of the joint shaft (20) interlockingly connecting the PIC shaft (6);
The joint holder (22) is provided with an oscillating fulcrum (52) and a positioning part (56) that are detachably inserted into an engagement groove (54) provided on the connection frame (19) side,
At the lower end side of the engagement groove (54), a fulcrum receiving part (55) for receiving the swing fulcrum part (52) so that the joint holder (22) swings up and down around the swing fulcrum part (52). )
The positioning groove (54) is located above the swing fulcrum (52) in a state where the engagement groove (54) is formed long vertically and the swing fulcrum (52) is supported by the fulcrum support (55). And is configured to restrict downward swinging around the swinging fulcrum (52) of the joint holder (22) by contacting the front edge of the engaging groove (54). Machine coupling device.   The positioning portion (56) is in a state where the positioning portion (56) contacts the front edge side of the engaging groove (54) and the downward swinging around the swinging fulcrum portion (52) of the joint holder (22) is restricted. The work machine coupling device according to claim 1, wherein an upward movement restricting portion (58) for restricting the upward movement of the engagement groove (54) is provided.   From the state where the positioning portion (56) contacts the front edge side of the engaging groove (54) and the downward swinging around the swinging fulcrum portion (52) of the joint holder (22) is restricted, the joint holder (22) When the positioning part (56) contacts the rear edge side of the engagement groove (54) when the upper part swings around the swinging fulcrum part (52), the swinging fulcrum part of the joint holder (22) ( 52) The work machine coupling device according to claim 2, wherein upward swinging around is restricted.   An insertion port (60) for removably inserting the swing fulcrum portion (52) and the positioning portion (56) into the engagement groove (54) is provided in the middle in the vertical direction on the rear edge side of the engagement groove (54). 4. The work machine connection device according to claim 1, wherein the work device connection device is provided in an open shape toward the rear side.

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