JP5165609B2 - Work machine connection structure - Google Patents

Description

  The present invention relates to a work machine connection structure for connecting a work machine to a tractor.

  In a two-point link type work implement connection structure for connecting a work implement to a conventional tractor, a hitch frame having the pair of attachment rods by connecting a pair of left and right attachment rods lifted and lowered by a hydraulic device, It is configured separately from the work implement, and the front end sides of the pair of left and right mounting rods are pivotally supported on the tractor vehicle body side, and the hitch frame is provided with a lower locking groove and an upper locking groove. An upper engaging portion and a lower engaging portion are provided, and the upper engaging portion of the work implement is engaged with the upper locking groove of the hitch frame, and the work implement is swung forward with the upper engaging portion as a fulcrum. As a result, the lower engaging portion of the work implement engages with the lower locking groove of the hitch frame, and the PTO shaft of the tractor and the PIC shaft of the work implement are connected (for example, Patent Document 1). .

JP 2007-82477 A

However, in the conventional case, when the work implement is mounted on the tractor, the hitch frame is engaged with the upper engaging groove of the hitch frame so that the upper engagement portion of the work implement is crawled. Because it can swing around the fulcrum, fine adjustments are made to the height and longitudinal alignment of the upper engaging groove of the hitch frame and the upper engaging part of the work implement, for example, operation of the position lever and forward / backward movement of the tractor Therefore, the alignment between the upper locking groove and the upper engaging portion is very troublesome.
In view of the above problems, the present invention is configured to easily engage the upper engaging portion of the work implement with the upper locking groove of the hitch frame when the work implement is mounted on the rear portion of the tractor. .

The technical means of the present invention for solving this technical problem is a pair of left and right mounting rods whose front end side is pivotally supported on the tractor body side so as to be swingable about the horizontal axis and which is raised and lowered about the horizontal axis by a hydraulic device. the hitch frame formed by connecting fixed by the upper connecting rods is, the working machine is configured separately, the upper locking groove is provided in the upper connection rod with the lower locking groove is provided in the left and right mounting rod, work The machine is provided with an upper engaging portion constituted by a pin engaged with the upper locking groove and a lower engaging portion constituted by a pin engaged with the lower locking groove, By engaging the upper engagement portion of the work implement with the locking groove and swinging the work implement forward with the upper engagement portion as a fulcrum, the lower engagement portion of the work implement is placed in the lower locking groove of the hitch frame. 2 points to connect the PTO shaft of the tractor and the PIC shaft of the work equipment. In working machine coupling structure links formula,
The upper connecting rod is provided with a positioning protrusion that is positioned in front upper of the upper locking groove and restricts the forward movement of the upper engaging portion of the work implement ,
The positioning protrusion is disposed at a position corresponding to the swing locus around the horizontal axis of the upper locking groove, and the lower end of the positioning protrusion is located inside the swing locus,
The upper connecting rod is provided with an inclined guide surface inclined downward in a direction approaching the swinging locus from the lower end of the positioning projection toward the upper locking groove .

Another technical means of the present invention, when attaching lever is in a horizontal state, the rear end edge of the positioning projections, lies in that not sent down vertical so as to be substantially vertically to a horizontal plane.

  According to the present invention, since the positioning protrusion is located at the upper front of the upper locking groove, when the work implement is mounted on the rear portion of the tractor, the upper locking groove of the hitch frame is used as the upper engagement of the working machine with the positioning protrusion as a guide. The upper engagement portion of the work implement is brought into contact with the positioning projection so that the upper engagement portion of the work implement does not exceed the positioning projection. The stop groove and the upper engagement portion can be easily engaged.

It is a side view of a tractor and a hitch frame showing one embodiment of the present invention. It is the same hitch frame rear view. It is the same hitch frame top view. It is a side view of the rear end part and hitch frame of the tractor. It is a side view of the working machine. It is a side view which shows the state with which the working machine was mounted | worn with the tractor.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, a work machine 3 exemplified by the rotary tiller shown in FIG. 5 is connected to a tractor 1 of a two-shaft, four-wheel type via a pair of left and right attachment rods 2 (by a two-point link type work machine connection structure). Are detachably connected.
The tractor 1 includes a hydraulic device (working device lifting device) 7 having left and right lift arms 6 on a tractor vehicle body 5, and left and right rear wheels 8 are covered with fenders 9, and is operated between the left and right fenders 9. A seat 10 is provided, and a PTO shaft 11 protrudes rearward from the rear end of the tractor vehicle body 5.

1 to 4, a hitch base 13 is fixed to the rear surface side of the tractor vehicle body 5 by bolting or the like. The hitch stand 13 has a pair of left and right support brackets 14. A pair of left and right support brackets 14 are disposed on both the left and right sides of the PTO shaft 11, and a hitch fitting 15 is fixed to the rear end portion of the support bracket 14. The hitch metal fitting 15 is formed in a U shape in a side view.
As shown in FIG. 5, in the working machine 3, the support arm 20 protrudes left and right from a gear case 19 that protrudes forward from the PIC shaft 18, and the transmission case 21 and the side frame 22 are fixed to the outer ends of the left and right support arms 20. Thus, a rotary machine frame 23 is configured. A claw shaft 24 is rotatably supported at the lower part of the transmission case 21 and the side frame 22, and a plurality of tilling claws are attached to the claw shaft 24 to constitute a rotary tilling portion 26. A tilling cover 29 is provided to cover the upper portion, both side portions, and the rear portion of the rotary tilling portion 26.

Further, the rear mast 27 and the front mast 28 are fixed to the gear case 19, and a pair of left and right connecting brackets 30 projecting forward are provided on the left and right support arms 20, and a support frame 31 extending rearward is swingable. It is connected. A height adjustment mechanism 32 is provided between the support frame 31 and the rear mast 27 so that the height of the rear two wheels mounted on the rear part of the support frame 31 can be adjusted.
At the upper end of the front mast 28, there is provided an upper engagement portion 35 constituted by a pin or a bolt shaft in the left-right direction. The pair of left and right connecting brackets 30 are provided with a pair of left and right lower engaging portions 36 configured by pins or the like in the left-right direction.

A stand 37 is foldably or detachably provided at a front end portion of the tillage cover 29 that covers the rotary tillage portion 26 of the work implement 3, and the work implement 3 can stand on its own with the rotary tillage portion 26 installed by the stand 37. It is configured as follows.
2 to 4, the pair of left and right mounting rods 2 are coupled by an arch-shaped upper coupling rod 39 and a flat plate-shaped lower coupling rod 40, and a pair of left and right mounting rods 2, an upper coupling rod 39 and a lower coupling rod. A hitch frame 41 having 40 is formed separately from the work machine 3. The upper connecting rod 39 and the lower connecting rod 40 of the hitch frame 41 are connected by a pair of left and right vertical connecting rods 42.

A left and right connecting pin (horizontal axis) 45 is provided at the front end of the pair of left and right mounting rods 2. An L-shaped support member 46 is fixed to the front end portions of the pair of left and right attachment rods 2 by welding or the like, and the horizontal shaft 45 is attached between the support member 46 and the front end portion of the attachment rod 2.
By inserting the connecting pin 45 into the front side of the hitch fitting 15 and holding the retaining pin detachably on the rear side of the hitch fitting 15 to prevent the horizontal shaft 45 from coming off, The front end portion of 2 is swingably and detachably connected around the horizontal axis 45 in the left-right direction, and the front end sides of the pair of left and right mounting rods 2 are pivotally supported on the tractor vehicle body 5 side.

On the rear end side of the pair of left and right mounting rods 2, a lower locking groove 50 that is recessed in the forward direction is provided, and is immersed downward in the upper surface of the central portion in the left-right direction of the upper coupling rod 39 of the hitch frame 41. A concave groove-shaped upper locking groove 51 is provided. By engaging the upper engagement portion 35 of the work implement 3 with the upper engagement groove 51 of the hitch frame 41 and engaging the lower engagement portion 36 of the operation implement 3 with the lower engagement groove 50 of the hitch frame 41. The work implement 3 is configured to be detachably fixed to the hitch frame 41.
A positioning projection 56 for restricting the forward movement of the upper engagement portion 35 of the work machine 3 is provided in front of and above the upper locking groove 51 of the upper connecting rod 39 (hitch frame 41). The positioning protrusion 56 is disposed at a position on the front side of the upper locking groove 51 and corresponding to the swinging locus X around the horizontal axis 45 of the upper locking groove 51, and when the mounting rod 2 is in a horizontal state, the positioning protrusion 56 The rear end edge 56a of 56 is suspended so as to be substantially perpendicular to the horizontal plane. On the front side of the upper locking groove 51 of the upper connecting rod 39, an inclined guide surface 57 that is inclined downwardly from the lower end of the positioning projection 56 toward the upper locking groove 51 is provided.

  1 to 4 and 6, the PTO shaft 11 of the tractor 1 and the PIC shaft 18 of the work machine 3 are connected by a joint shaft 53. The front end side of the joint shaft 53 is connected to the PTO shaft 11 of the tractor 1 via a constant velocity joint 54. The constant velocity joint 54 has a front universal joint portion 54a and a rear universal joint portion 54b, and the front universal joint portion 54a. Are connected to the PTO shaft 11 so as to be bendable, and are connected to the joint shaft 53 so as to be bendable at a rear universal joint portion 54b. Therefore, the PTO shaft 11 and the joint shaft 53 are connected via the constant velocity joint 54 so as to be bent in two steps, the front universal joint portion 54a on the PTO shaft 11 side and the rear universal joint portion 54b on the joint shaft 53 side. It is connected.

  The work machine 3 is mounted on the tractor 1 via a pair of left and right mounting rods 2, and the PTO shaft 11 of the tractor 1 and the PIC shaft 18 of the work machine 3 are connected by a joint shaft 53 as shown in FIGS. 3 and 4. In this state, the PTO shaft 11, the constant velocity joint 54, the joint shaft 53, and the PIC shaft 18 are arranged in the front-rear direction at substantially the same height as the pair of left and right mounting rods 2, and the front universal joint of the constant velocity joint 54 The portion 54a is disposed in front of the pivotal support portions (horizontal shaft 45) of the pair of left and right mounting rods 2, and the rear joint portion 54b of the constant velocity joint 54 is a pivotal portion for the tractor 1 of the pair of left and right mounting rods 2 The pivotal support part (horizontal axis 45) to the tractor 1 of the pair of left and right mounting rods 2 is arranged behind the front universal joint 54a of the constant velocity joint 54 and the rear side. Intermediate with universal joint 54b It is arranged in a location.

On the rear end side of the joint shaft 53, a shaft fitting portion 55 for detachably fitting and fixing the PIC shaft 18 of the work machine 3 is provided. The shaft fitting portion 55 is formed in a concave shape with an opening at the rear.
2 to 5, a pair of left and right support rods 60 are provided on the rear end side of the joint shaft 53 via bearings 59. A bearing 59 is provided on the rear end side of the joint shaft 53 so as to be externally fitted, and an annular body 61 is externally fixed to the outer periphery of the bearing 59, and a pair of left and right support rods 60 project rearwardly from the annular body 61. Yes.
Engaging protrusions 63 are respectively provided at the rear end portions of the pair of left and right support rods 60, and a pair of left and right engaging recesses corresponding to the pair of left and right engaging projections 63 are formed on the pair of left and right vertical coupling rods 42 of the hitch frame 41. 64 is provided, and the pair of left and right engaging recesses 64 are formed in a concave shape opened at the rear end side and recessed forward, and the pair of left and right engaging projections 63 are formed on the pair of left and right engaging recesses 64 from the rear side. The pair of left and right support rods 60 are movably engaged with the hitch frame 41 so as to be movable back and forth, thereby restricting the joint shaft 53 from descending downward from the universal joint 54. Yes.

The rear end side of the joint shaft 53 is in contact with the hitch frame 41 via a bearing 59 so that the joint shaft 53 is held in a posture in which the PIC shaft 18 can be fitted to the shaft fitting portion 55 of the joint shaft 53. A contact portion 65 is provided.
Thus, by engaging the upper engagement portion 35 of the work implement 3 with the upper locking groove 51 of the hitch frame 41 and swinging the work implement 3 forward with the upper engagement portion 35 as a fulcrum, The lower engaging portion 36 of the work implement 3 is engaged with the lower locking groove 50 of the frame 41, and the PIC shaft 18 of the work implement 3 is fitted and fixed to the shaft fitting portion 55 of the joint shaft 53. Has been.

Although not shown, the lower engaging portion 3 engaged with the lower locking groove 50 at the rear portion of the mounting rod 2 or the like.
A lock mechanism that locks 6 so that it does not come off from the lower locking groove 50 is provided, and can be unlocked manually.
3 to 5, a connecting pin 76 is provided in the rear middle part of the pair of left and right mounting rods 2 so as to protrude outward, and a lift rod 71 is connected to the tip side of the pair of left and right lift arms 6. The lower ends of the pair of left and right lift rods 71 are respectively connected to the pair of left and right connecting pins 76 via ball joints. As a result, the lift arms 6 are connected to the pair of left and right mounting rods 2 of the hitch frame 41 via the lift rods 71, and the operation of the hydraulic device 7 causes the hitch frame to move via the left and right lift arms 6 and the lift rods 71. The working machine 3 fixed to 41 to the hitch frame 41 is configured to move up and down. That is, the work machine 3 can be moved up and down by the lift arm 6 and the lift rod 71 of the hydraulic device 7 via a two-point link constituted by a pair of left and right mounting rods 2.

Note that one lift rod 71 of the pair of left and right lift rods 71 may be provided with a cylinder, and by adjusting the expansion and contraction of the cylinder, the work implement 3 may be configured to be adjustable in Monroe so that the left and right are horizontal.
According to the above embodiment, when the work implement 3 is mounted on the tractor 1 via the pair of left and right mounting rods 2, the front end side of the pair of left and right mounting rods 2 is pivotally supported in advance on the tractor vehicle body 5 side. The hitch frame 41 is connected to the tractor body 5.
Thereafter, for example, the tractor 1 and the hitch frame 41 are brought closer to the work machine 3 installed in a state where the stand 37 is used independently on a farm field or the like, and the hydraulic device 7 operates to move left and right. The hitch frame 41 is adjusted up and down via the lift arm 6 and the lift rod 71, so that the upper engaging groove 35 of the work machine 3 is scooped from below by the upper locking groove 51 of the hitch frame 41. The upper engaging portion 35 of the work machine 3 is engaged with the upper locking groove 51 of 41.

  At this time, since the positioning protrusion 56 is located at the front upper side of the upper locking groove 51, the upper locking groove 51 of the hitch frame 41 is positioned with respect to the upper engagement portion 35 of the work machine 3 with reference to the positioning protrusion 56. Further, since the rear end edge 56a of the positioning projection 56 is suspended so as to be substantially perpendicular to the horizontal plane, the upper engagement portion of the work implement is attached to the rear end edge 56a of the positioning projection 56. The upper engagement portion 35 of the work implement 3 can be reliably regulated so as not to exceed the positioning projection 56 by contacting the 35. When the hitch frame 41 is raised by the hydraulic device 7 in a state where the upper engagement portion 35 is regulated so as not to exceed the positioning protrusion 56, the positioning protrusion 56 is located on the front side of the upper locking groove 51. And an inclined guide surface 57 that is disposed at a position corresponding to the swing locus X around the horizontal axis 45 of the upper locking groove 51 and is inclined downward from the lower end of the positioning projection 56 toward the upper locking groove 51. Therefore, the upper engagement portion 35 of the work machine 3 slides on the inclined guide surface 57 rearward and engages with the upper locking groove 51 reliably and easily. Therefore, it is not necessary to correct the alignment of the upper engagement portion 35 of the work implement 3 with the upper engagement groove 51 of the hitch frame 41, and the upper engagement groove 51 and the upper engagement portion 35 can be easily engaged. Can do.

  Next, when the hitch frame 41 is raised by the operation of the hydraulic device 7, as shown in FIG. 6, the work implement 3 swings forward with the upper engagement portion 35 as a fulcrum, The lower engagement portion 36 of the work machine 3 is engaged with the stop groove 50. Further, as shown in FIG. 6, the PIC shaft 18 is inserted into the shaft fitting portion 55, and the PIC shaft 18 of the work machine 3 is fitted and fixed to the shaft fitting portion 55 of the joint shaft 53. . As a result, the work machine 3 is detachably fixed to the hitch frame 41, and the PTO shaft 11 of the tractor 1 and the PIC shaft 18 of the work machine 3 are connected by the joint shaft 53.

In this case, the PTO shaft 11 and the joint shaft 53 are connected via the constant velocity joint 54 so as to be bent in two stages, the front universal joint portion 54a on the PTO shaft 11 side and the rear universal joint portion 54b on the joint shaft 53 side. Therefore, the inclination of the joint shaft 53 coincides with the PIC shaft 18 while the height of the rear end side of the joint shaft 53 is adjusted to the height of the front end side of the PIC shaft 18 by two-stage bending. It becomes possible to make it. Further, as viewed from the side, the pivotal support portion (horizontal shaft 45) of the pair of left and right mounting rods 2 to the tractor 1 is disposed at an intermediate position between the front universal joint portion 54a and the rear universal joint portion 54b of the constant velocity joint 54. The support rod 60 is engaged with the hitch frame 41 so as to be movable back and forth so as to restrict the joint shaft 53 from descending downwardly from the universal joint 54, and the shaft fitting portion of the joint shaft 53. The hitch frame 41 is provided with a contact portion 65 in which the rear end side of the joint shaft 53 contacts via a bearing 59 so that the joint shaft 53 is held in a posture in which the PIC shaft 18 can be fitted to 55. Therefore, the inclination posture of the joint shaft 53 can be accurately adjusted to the inclination of the PIC shaft 18, and when the lower engagement portion 36 of the work machine 3 is engaged with the lower engagement groove 50 of the hitch frame 41. The PIC shaft 18 of the working machine 3 in the axial fitting portion 55 of the joint shaft 53 can be fitted and fixed reliably and smoothly.

Therefore, when the work machine 3 is connected to the tractor 1 using the two-point link type work machine connection structure, the operator does not get off the tractor 1 and the tractor 1 is connected to the tractor 1. The PIC shaft 18 of the work machine 3 can be connected to the one PTO shaft 11 at the same time, and the work machine 3 can be attached to and detached from the tractor 1 with an auto hitch, which is very convenient.
In the above embodiment, when the mounting rod 2 is in the horizontal state, the rear end edge 56a of the positioning protrusion 56 is suspended so as to be substantially perpendicular to the horizontal plane. As shown by a chain line, when the mounting rod 2 is in a horizontal state, the rear end edge 56a of the positioning projection 56 may be inclined forward and downward so as to have an acute angle with respect to the horizontal plane. In this case, the upper engagement portion 35 of the work implement is brought into contact with the rear end edge 56 a of the positioning projection 56, so that the upper engagement portion 35 of the work implement 3 can be more reliably regulated so as not to exceed the positioning projection 56.

  In the above-described embodiment, the lower locking groove 50 is provided on the rear end side of the pair of left and right mounting rods 2, and the upper locking groove 51 is provided in the center in the left-right direction of the connecting rod 39. A pair of left and right portions 36 are provided in the work implement 3 corresponding to the lower locking grooves 50 of the pair of left and right mounting rods 2, and the upper engagement portion 35 is operated corresponding to the upper locking groove 51 of the connecting rod 39. Although provided in the machine 3, the position where the lower locking groove 50 and the upper locking groove 51 are provided in the hitch frame 41 is not limited to the case of the above-described embodiment. May be provided at the lower portions of the left and right sides of the upper connecting rod 39 of the hitch frame 41, both ends of the lower connecting rod 40, and the like. Further, the number of the lower locking grooves 50 and the upper locking grooves 51 is not limited to the case of the above embodiment. For example, one or more lower locking grooves 50 are provided in the hitch frame 41, and the upper locking grooves are provided. Two or more 51 may be provided. Further, one or more lower engagement portions 36 may be provided on the work machine 3, and two or more upper engagement portions 35 may be provided.

DESCRIPTION OF SYMBOLS 1 Tractor 2 Mounting rod 3 Working machine 5 Tractor vehicle body 11 PTO shaft 18 PIC shaft 35 Upper engaging portion 36 Lower engaging portion 39 Upper connecting rod 41 Hitch frame 45 Horizontal shaft 50 Lower locking groove 51 Upper locking groove 56 Positioning protrusion 56a Rear edge 57 Inclined guide surface X Swing locus

Claims (2)

A pair of left and right mounting rods (2) whose front end side is pivotally supported on the tractor body (5) side so as to be swingable about a horizontal axis (45) and which is raised and lowered about the horizontal axis (45) by a hydraulic device (7). The hitch frame (41 ) formed by connecting and fixing the upper attachment rod (39) to the upper and lower attachment rods (39) is constructed separately from the work machine (3), and the left and right attachment rods (2 ) are provided with lower locking grooves (50). In addition, an upper engaging groove (51 ) is provided in the upper connecting rod (39), and an upper engaging portion (35 ) configured by a pin that engages with the upper engaging groove (51) is provided in the work machine (3). ) And a lower engaging portion (36) configured by a pin that engages with the lower locking groove (50), and the work implement (3) in the upper locking groove (51) of the hitch frame (41). ) By engaging the upper engagement portion (35) and swinging the work implement (3) forward with the upper engagement portion (35) as a fulcrum, The lower engaging portion (36) of the work machine (3) engages with the lower locking groove (50) of the hitch frame (41), and the PTO shaft (11) of the tractor (1) and the work machine (3) In the two-point link type work machine connection structure that connects the PIC shaft (18),
On said connection rod (39), be located in front above the upper locking groove (51), positioning projections for restricting the forward movement of the upper engaging portion of the working machine (3) (35) (56) Provided ,
The positioning protrusion (56) is disposed at a position corresponding to the swing locus (X) around the horizontal axis (45) of the upper locking groove (51), and is positioned on the inner side of the swing locus (X). The lower end of (56) is located,
An inclined guide surface (57) inclined downward in a direction approaching the swing locus (X) from the lower end of the positioning projection (56) toward the upper locking groove (51) is provided on the upper connecting rod (39). A work machine connection structure characterized by that. Claim mounting rod (2) is at a horizontal state, the rear edge of the positioning projection (56) (56a), characterized in that they are made as vertical so as to be substantially vertically to a horizontal plane 1 The work machine connection structure described in 1.

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