JP4563064B2 - Tractor work equipment coupling device - Google Patents

Description

  The present invention relates to a tractor work machine connection device for connecting a work machine to a rear portion.

  Conventionally, as a tractor work machine connecting device, for example, left and lower right stays are fixedly extended on both lower sides of a work machine hitch having a 3P connecting portion, and left and right lower stays on the work machine hitch side are fixed. The front end is connected to the left and right 2P set pins provided on the tractor side fuselage hitch so that it can be pivoted up and down. The upper part of the work implement hitch is connected with a pin via a link, and the work implement is attached to the 3P connecting portion of the work implement hitch. From the PTO shaft on the tractor side to the work implement connected to the work implement hitch via the refractive transmission shaft There is one that transmits power (see, for example, Patent Document 1).

  According to this prior art, when a work machine such as a rotary cultivator is connected to a tractor, the work machine can be mounted on a work machine hitch configured in a two-point connection type.

JP 2002-191204 A (page 2-3, FIG. 1)

  However, in the prior art, since the axis of the universal joint that connects the PTO shaft of the tractor and the connecting shaft of the work machine is not aligned with the axis of the connecting shaft, when connecting the tractor and the work machine, Needs to correct the position of the universal joint, which complicates the work.

  In view of the above-described circumstances, the present invention facilitates connecting work implements by automatically moving the universal joint to a position aligned with the connection shaft of the work implement when connecting the work implement to the tractor. It is an object of the present invention to provide a work machine coupling device for a tractor that can perform the above.

In order to achieve the above object, the present invention is directly connected to the rear portion of the tractor (1) by two connecting portions (7, 7) on the left and right sides, and lift rods (26) to the lift arm (26) of the tractor (1). and linked coupling device body via the 27, 28) (10), and the tractor (1) PTO shaft (3) and work machine input shaft (51) universal joint (4 connecting the), the connecting In the work implement coupling device for the tractor (1), which is provided integrally with the apparatus main body and has mounting portions (20, 12) for mounting the work implement (31).
An inverted L-shaped protrusion (5a) is formed on a joint support (5) that rotatably supports a work machine side portion of the universal joint (4), and the connecting device body (10) has a left-right direction. Protruding shafts (13, 13) are provided,
The projecting portion (5a) is hung on the shaft (13, 13), and the working machine side portion of the universal joint (4) is movable up and down by a predetermined amount with respect to the coupling device body (10). It is supported by a predetermined amount of movement in the axial direction,
The tractor work machine coupling device is characterized by the above.

Instrumentation wear part has an upper mounting portion (20) and the two left and right lower attachment portion (12),
The lower attachment portion (12), the connecting portion of the lift rod (27, 28) (21, 22) and ing arranged downward in overlapping positions in the vertical direction.

Before SL connecting instrumentation Okimoto body (10), the tractor (1) two right and left connecting portion that connects to (7), two right and left lower connecting portion for mounting the work machine (31) (12), the working An upper mounting portion (20) for mounting the machine (31) and a shaft (13) for supporting the joint support (5) up and down by a predetermined amount and freely moving in a predetermined amount in the axial direction , and formed by integral molding. that Do not.

  The reference numerals in the parentheses are for reference to the drawings and do not limit the present invention.

According to the present invention according to claim 1, when mounting the working machine on the work vehicle coupling device, when connecting the working machine to the mounting portion, the working machine side portion of the universal joint is automatically moved in the vertical direction and the rotational direction Te, Ru can be fitted, coupled to the input shaft and the alignment of the working machine. Further, when the work implement is lifted and lowered by the lift arm, the work implement side portion of the universal joint is easily moved in the axial direction by the joint support supported by the inverted L-shaped protrusion and the shaft, and the length of the universal joint The working machine can be bent smoothly by allowing the change in height, and the working machine can be raised and lowered easily and reliably.

  According to the second aspect of the present invention, in the work implement connecting device, it is preferable that the connecting portion with the lift rod is separated from the connecting portion with the tractor in terms of obtaining a large lift, and from the viewpoint of mounting the work implement, It is preferable to reduce the distance between the tractor and the work implement by shortening the machine connection device. The lower mounting part and the lift rod connection part are arranged at positions that overlap in the vertical direction, so that the work equipment connection is compact and has a good weight balance. A device can be obtained.

Form a consolidated apparatus body integrally molded article of the lost wax process, etc. Then, the strength is reinforced by at rib out etc. required, wear is wider surface where intense, functionally best shape in and waste meat It is possible to reduce the weight and reduce the cost.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 is a side view of the auto hitch unit of the tractor and the rotary tiller, FIG. 2 is a plan view of the auto hitch unit shown in FIG. 1, and FIG. 3 is a view of the auto hitch unit shown in FIG. 1 from the rotary tiller side. FIG. 4 is a front view of the connecting part of the rotary tiller shown in FIG. 1 as viewed from the tractor side, and FIG. 5 is a side sectional view of the power transmission part of the tractor and the rotary tiller.

  In FIG. 1, a universal joint 4 is connected to the rear end of a PTO shaft 3 that protrudes rearward from the rear portion of the body 2 of the tractor 1. As shown in FIG. 5, a joint support 5 is rotatably supported via a bearing 4 a attached to the rear end portion of the universal joint 4. On the left and right sides of the joint support 5, inverted L-shaped protrusions 5a and 5a are formed.

  As shown in FIGS. 1, 2, and 3, a 2P bracket 6 is fixed to the rear portion of the body 2 of the tractor 1 so as to surround the PTO shaft 3, and the 2P bracket 6 has left and right sides of the PTO shaft 3. Pins 7 and 7 are arranged so as to be located on both sides.

  The auto hitch 10 is supported through the pins 7 and 7 so as to be swingable in the vertical direction. The auto hitch 10 has a pair of left and right hitch frames 11, 11, and tip portions thereof are swingably supported by the pins 7, 7. U-shaped lower connecting portions 12 and 12 are formed at the rear ends of the hitch frames 11 and 11 and open toward the rear. As shown in FIG. 6, protrusions 12a and 12a are formed on the upper side surfaces of the lower connecting portions 12 and 12, respectively.

  Shafts 13 and 13 are attached in front of the lower connecting portions 12 and 12 of the hitch frames 11 and 11 so as to penetrate the hitch frames 11 and 11, respectively. On the shafts 13 and 13, hook plates 14 and 14 that open and close the openings of the lower connecting portions 12 and 12 are swingably supported so as to be located outside the hitch frames 11 and 11, respectively. . Further, return springs 15 and 15 are attached to the shafts 13 and 13 so as to be positioned outside the hook plates 14 and 14.

As shown in FIG. 6, the hook plates 14, 14 are connected to the lower connecting portions 12, 12 by return springs 15, 15 that abut one end of the pins 15 a, 15 a fixed to the hitch frames 11, 11. It is biased in the direction of closing the opening. Incidentally, the hitch frame 11, 11 and pins 15a, 15a may be integrally formed by loss preparative wax process or the like.

  Each of the hook plates 14 and 14 is fixed with operating levers 16 and 16 for operating the hook plates 14 and 14 in a direction to open the openings of the lower connecting portions 12 and 12, respectively. Springs 17 are mounted. When the torsion springs 17 and 17 are operated in a direction to open the openings of the lower connecting portions 12 and 12, one end of the torsion springs 17 and 17 engages with the projecting portions 12a and 12a so that the operation levers 16 and 16 are engaged. It is held at that operating position.

  Between the shafts 13, 13, the protrusions 5 a formed on both sides thereof are supported so as to hang over the shafts 13, 13 so that the joint support 5 is located between the hitch frames 11, 11. Has been. That is, the rear end portion of the universal joint 4 is supported by the hitch frames 11, 11 via the joint support 5.

  The hitch frames 11 and 11 are integrally connected by a beam 18 formed of a round steel pipe or the like. An upper connecting bracket 19 is fixed to the central portion of the beam 18, and a U-shaped upper connecting portion 20 that opens upward is formed at the upper end of the upper connecting bracket 19. Note that connecting shafts 21 and 22 are fixed to the outer side surfaces of the hitch frames 11 and 11 so as to be positioned above the lower connecting portion 12.

  Lift arms 26 and 26 are fixed to both ends of the output shaft 25 projecting in both the left and right directions from driving means (not shown) disposed on the upper part of the body 2 of the tractor 1. The other end of the lift cylinder 27 that is swingably connected to one end of the one lift arm 26 is swingably connected to the one hitch frame 11 via the connecting shaft 21. The other end of the lift rod 28 that is swingably connected to one end of the other lift arm 26 is swingably connected to the other hitch frame 11 via the connecting shaft 22.

  Therefore, by rotating the output shaft 25 and swinging the lift arm 26, the auto hitch 10 can be swung up and down around the pin 7. At this time, the lift cylinder 27 does not operate and only the loft arm 26 and the hitch frame 11 are connected in the same manner as the lift rod 28. Also, the auto hitch 10 can be swung up and down around the pin 7 by operating the lift cylinder 27.

As for the rotary tiller 31 as a working machine, the arms 33 and 33 are being fixed to the right-and-left both sides of the gear case 32 arrange | positioned in the center part. A chain case 34 is fixed to the outside of one arm 33, a side plate 35 is fixed to the outside of the other arm 33, and a rotary cover 36 is fixed between the chain case 34 and the side plate 35. ing. A rear cover 37 is swingably supported at the rear portion of the rotary cover 36, and a stand 38 is swingably supported so as to be positioned in front of the chain case 34.

  A pair of top masts 41, 41 are fixed to the upper part of the gear case 32 via the arms 33, 33, and the upper connecting part 20 formed on the upper connecting bracket 19 is between the top masts 41, 41. A connecting pin 42 is removably fitted to the connecting pin 42. One end of a lift arm 43 supported swingably on the upper portions of the arms 33 and 33 is connected to one end of the rear cover 37 so as to be swingable. A lift mechanism 44 using a screw mechanism is swingably connected to the top mast 41 and the lift arm 43, and the height of the rear end portion of the rear cover 37 can be adjusted by operating the handle 45. ing.

  An input shaft 51 that receives power transmission from the PTO shaft 3 via the universal joint 4 projects from the front surface of the gear case 32 facing the tractor 1. Further, a lower connection bracket 52 is fixed so as to surround the input shaft 51 via the arms 33, 33 so as to be positioned in front of the gear case 32. On the left and right sides of the lower connection bracket 52, connection pins 53, 53 that are detachably fitted to the lower connection portions 12, 12 formed on the hitch frames 11, 11 of the auto hitch 10 are fixed. .

  As shown in FIG. 2, a cover 54 is disposed between the input shaft 51 and the lower connection bracket 52 so that an operator's hand does not enter the rotating portion. As shown in FIG. 5, it may be a product integrally formed with the lower connection bracket 52 by the lost wax method or the like.

  6 to 9 are process diagrams showing a process of attaching and detaching the tractor and the rotary tiller. FIG. 6 is a side view of a main part showing a state immediately before the rotary tiller is mounted on the tractor. FIG. FIG. 8 is a side view of the main part showing the alignment state of the universal joint and the input shaft when the rotary tiller is mounted, FIG. 8 is a side view of the main part showing the state where the rotary tiller is mounted on the tractor, and FIG. It is a side view of the principal part which shows the state which makes a rotary cultivator remove | separate from a tractor.

  When the rotary cultivator 31 is mounted on the tractor 1, as shown in FIG. 1, the rotary cultivator 31 waits in a state where the stand 38 stands behind the tractor 1. On the other hand, the tractor 1 operates the operation lever 16 of the auto hitch 10 at a position away from the rotary cultivator 31 to open the opening of the lower connecting portion 12 formed at the rear end portion of the hitch frame 11. .

  As shown in FIG. 6, one end of the torsion spring 17 attached to the base of the operation lever 16 is engaged with the protrusion 12 a on the side so as to cross the lower connecting portion 12, and the operation lever 16 is in its operation position. The lower connecting portion 12 is held open. In this state, the tractor 1 is moved backward, and the upper connecting bracket 19 and the upper connecting portion 20 of the auto hitch 10 are moved to a position facing the connecting pin 42 supported by the top mast 41 on the rotary tiller 31 side.

As shown in FIG. 7, when the lift arm 26 (see FIG. 6) is operated to swing the auto hitch 10 counterclockwise, the rear portion of the auto hitch 10 rises and the upper connection bracket 19 is connected to the upper connection bracket 19. The part 20 fits with the connecting pin 42 and pushes up the connecting pin 42. At this time, on the auto hitch 10 side, the joint support 5 is also lifted through the shaft 13 and the rear end of the universal joint 4 is pulled up.

On the other hand, the rotary tilling 耘 machine 31 side, by the connecting pin 42 by an upper connecting bracket 19 is pushed up, the top mast section 41 swings in the clockwise direction as a fulcrum rotary ground. As the top mast 41 swings, the arm 33 (see FIG. 1) swings in the same direction, and the gear case 32 (that is, the input shaft 51) and the lower connecting bracket 52 swing in the same direction.

  By swinging the auto hitch 10 and the arm 33, the lower connecting portion 12 at the rear end of the hitch frame 11 and the connecting pin 53 of the lower connecting bracket 52 can be made to face each other. At the same time, the axis 4c of the universal joint 4 and the axis 51c of the input shaft 51 can be aligned.

As shown in FIG. 8, when the tractor 1 (see FIG. 1) is retracted, the rear end portion of the aligned universal joint 4 (see FIG. 7) is externally fitted to the input shaft 51 (see FIG. 7). Mating. At the same time, the lower connecting portion 12 at the rear end of the hitch frame 11 is fitted to the connecting pin 53. When the lower connecting portion 12 and the connecting pin 53 are completely fitted, the torsion spring 17 protruding so as to cross the lower connecting portion 12 moves forward (left side in the figure) while being pushed by the connecting pin 53, It comes off from the protrusion 12a. Then, since the restraining force by the torsion spring 17 is released, the hook plate 14 swings counterclockwise by the repulsive force of the return spring 15 and closes the opening portion of the lower connecting portion 12, so that the tractor 1 and rotary tiller 31 are connected.

  As described above, when the rotary cultivator 31 is mounted on the tractor 1, the rear end side of the universal joint 4 automatically moves in the vertical direction, aligns with the input shaft 51 of the rotary cultivator 31, and is fitted. Since they can be connected, the work machine can be easily mounted.

  As shown in FIG. 9, when the tractor 1 (see FIG. 1) and the rotary tiller 31 (see FIG. 1) are detached, the stand 38 (see FIG. 1) is raised to stabilize the rotary tiller 31. Thus, the vertical operation lever 16 is swung clockwise, and the hook plate 14 is swung counterclockwise, thereby opening the rear side of the lower connecting portion 12. At this time, one end of the torsion spring 17 engages with the connecting pin 53 to hold the operation position of the operation lever 16.

When the tractor 1 (see FIG. 1) is advanced in this state, the lower connecting portion 12 is detached from the connecting pin 53. At the same time, the universal joint 4 (see FIG. 7) is also detached from the input shaft 51 (see FIG. 7). When the lift arm 26 is operated and the auto hitch 10 is swung clockwise, the upper connecting portion 20 of the upper connecting bracket 19 is detached from the connecting pin 42 (see FIG. 7). When the tractor 1 is moved forward, the separation of the tractor 1 and the rotary cultivator 31 is completed.

  FIG. 10 is a side view showing a state in which the rotary tiller is lifted. In FIG. 10, the same components as those in FIG.

  In the plowing work by the rotary cultivator 31, when the direction is changed at the end of the field, the rotary cultivator 31 is pulled up so as not to roughen the cultivated field. This operation is performed by swinging the lift arm 26 counterclockwise by driving means (not shown). That is, the swing of the lift arm 26 causes the auto hitch 10 to swing counterclockwise around the pin 7 via the lift cylinder 27 and the lift rod 28 (see FIG. 3). Then, the connecting pin 42 fitted to the upper connecting portion 20 of the upper connecting bracket 19 and the connecting pin 53 fitted to the lower connecting portion 12 of the hitch frame 11 are pulled up, and the rotary tillage is performed via the top mast 41 and the arm 33. The entire machine 31 is pulled up as shown in FIG.

  11 is a side view showing the state of the universal joint during tillage, FIG. 12 is a side view showing the state of the universal joint when the rotary tiller is pulled up, and the same components as those in FIG. The description is omitted.

  Even when the tractor 1 and the rotary cultivator 31 are slightly swayed during the plowing operation, the universal joint 4 has a substantially straight axis 4c as shown in FIG. Yes. Accordingly, the distance between the rear end surface of the protrusion 5a of the joint support 5 and the rear end portion of the shaft 13 is relatively narrow with A.

  On the other hand, as shown in FIG. 10, when the rotary tiller 31 is raised, the universal joint 4 bends as shown in FIG. Accordingly, the distance between the rear end surface of the protrusion 5a of the joint support 5 and the rear end portion of the shaft 13 is relatively wide with B.

  Even if the distance between the rear end surface of the projection 5a and the rear end of the shaft 13 due to the bending and stretching of the universal joint 4 as described above varies, the projection 5a of the joint support 5 extends from the projection 5a to the shaft 13. Is set to a length L (L> B) that does not deviate.

  In the work machine connecting device as described above, the connecting portion between the hitch frame 11 of the auto hitch 10 and the lift cylinder 27 and the lift rod 28 is the connecting portion between the tractor 1 and the lift arm 26, that is, the one away from the output shaft 25. In view of obtaining a large lift, it is preferable to shorten the distance between the tractor 1 and the rotary cultivator 31 by shortening the auto hitch 10 when the rotary cultivator 31 is mounted. As described above, by arranging the lower connecting portion 12 of the hitch frame 11 and the connecting shafts 21 and 22 in a position that overlaps in the vertical direction, a compact and well-balanced work implement connecting device can be obtained.

  Further, as described above, for example, not only the hitch frames 11 and 11 and the pins 15a and 15a, the lower connecting bracket 52 and the cover 54, etc., but also the connecting device main body is integrally formed by the lost wax method as much as possible. As a result, the parts that require strength are reinforced with ribs, etc., and the areas that are heavily worn are widened, making them functionally the best shape, eliminating wasted meat, reducing weight, and reducing costs. It can be.

It is a side view of the auto hitch part of a tractor and a rotary tiller. It is a top view of the auto hitch part shown in FIG. It is the rear view which looked at the auto hitch part shown in FIG. 1 from the rotary tiller side. It is the front view which looked at the connection part of the rotary tiller shown in FIG. 1 from the tractor side. It is side surface sectional drawing of the power transmission part of a tractor and a rotary tiller. It is a side view of the principal part which shows the state just before mounting | wearing a rotary cultivator with a tractor. It is a side view of the principal part which shows the alignment state of the universal joint and input shaft at the time of mounting | wearing a rotary cultivator to a tractor. It is a side view of the principal part which shows the state which mounted | wore the rotary cultivator to the tractor. It is a side view of the principal part which shows the state which makes a rotary cultivator remove | separate from a tractor. It is a side view which shows the state which raised the rotary tiller. It is a side view which shows the state of the universal joint at the time of tillage. It is a side view which shows the state of a universal joint when a rotary tiller is pulled up.

Explanation of symbols

1 Tractor 3 PTO shaft 4 Universal joint 4a Bearing
5 Joint support
5a Protruding part 7 Connecting part (pin)
12 Lower mounting part (lower connecting part)
13 Bearing support (shaft)
20 Upper mounting part (upper connecting part)
22 Connecting part (connecting shaft)
26 Lift arm 28 Lift rod 31 Working machine (rotary tiller)

Claims (2)

Universally connected to the rear part of the tractor by two connecting parts on the left and right sides, a connecting device body connected to the lift arm of the tractor via a lift rod, and the PTO shaft of the tractor and the input shaft of the work implement In the working equipment coupling device for a tractor, which is provided integrally with the joint and the coupling device main body and has a mounting portion for mounting the working equipment,
In addition to forming a reverse L-shaped protrusion on the joint support that rotatably supports the work machine side of the universal joint, the connecting device body is provided with a shaft protruding in the left-right direction,
The projecting portion is spanned on the shaft, and the working machine side portion of the universal joint is supported so as to be movable in a predetermined amount in the vertical direction and movable in a predetermined amount in the axial direction with respect to the coupling device body.
A tractor work machine coupling device characterized by the above. The mounting portion has an upper mounting portion and two left and right lower mounting portions,
The lower mounting portion is arranged below the position where it overlaps with the connecting portion of the lift rod in the vertical direction.
The tractor work machine coupling device according to claim 1.

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