JP4585248B2 - Tractor work equipment coupling device - Google Patents

Description

  The present invention relates to an agricultural machine such as a tractor used in agriculture, and more particularly to a work machine coupling device that couples a tractor and a work machine.

  In a conventional agricultural tractor, when a work machine is generally connected by an auto hitch, the connection is performed by a three-point hitch method. However, when a work machine is connected by a small tractor, the auto hitch is not used, and A two-point connection type is mainly used.

  Therefore, in a work machine hitch having a three-point connecting part, the stays on both sides of the lower part extend forward in a fixed state, and the front end parts of these stays are vertically attached to a two-point set pin provided at the rear part of the tractor body. It is pivotally connected. In addition, the upper part of the work machine hitch is connected to a lift arm provided at the rear part of the machine body of the tractor so as to be freely rotatable up and down via a lift link. In this way, the work implement is attached to the work implement hitch connected to the tractor, and power is transmitted from the PTO shaft on the tractor side to the work implement via the refractive transmission shaft. There has been proposed one that connects a work machine by attaching a point connection type work machine hitch (see Patent Document 1).

JP 2002-191204 A

  However, in the case where the work machine is connected by attaching the three-point connection type work machine hitch to the rear part of the conventional two-point connection type tractor as described above, a universal joint connected from the PTO shaft that transmits power to the work machine, etc. Since the bending angle of the refracting transmission shaft increases, it is difficult to attach the work machine, and there is a problem that the influence of the rotation vibration by the universal joint or the like on the work machine is increased.

  In addition, in the above-mentioned Patent Document 1, a joint support for supporting the rear joint of the refractive transmission shaft is attached to the 2P set plate at the rear of the tractor so as to be rotatable around the axis of the set pin, and fixed to the joint support. An embodiment is disclosed in which the rotation restricting tool automatically aligns the joint portion and the intake shaft of the work implement when the work implement is mounted. However, the thing of this Example does not use the working machine hitch of the 3 point | piece connection type mentioned above, and does not concern on an auto hitch.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a tractor work machine connection device that can easily attach a work machine to a two-point hitch type connection device and allow the work machine to perform a stable operation. It is.

In order to achieve the object, the invention according to claim 1 is directly connected to the rear portion of the tractor (1) by two connecting portions on the left and right sides, and is connected to the lift arm (53) of the tractor (1). ) To the connecting device main body (18), the universal joint (3) having two folds connected to the PTO shaft (2) of the tractor (1), and the connecting device main body (18). In the working unit coupling device (5) of the tractor (1), the working unit coupling device (5) having a mounting unit (7) for mounting the working unit (37) provided integrally
A shaft (31) having one end connected to the rear joint of the universal joint (3) having the two bent portions and the other end connected to a connecting portion (39) capable of transmitting power to the working machine (37). )
The shaft (31) has a rear portion rotatably supported by a bearing holder (29) connected to the mounting portion (7) by a predetermined amount so as to freely move up and down, and a front portion thereof is connected to the universal joint ( 3) It is connected to the rear joint by a spline (32) so as to be axially movable.
It is characterized by that.

According to the invention which concerns on Claim 2, the said coupling device main body (18) is provided with the cover (35) so that the lower part of the said shaft (31) may be covered,
It is characterized by that.

According to the invention which concerns on Claim 3, it comprises the control member (23) which contact | abuts to the said shaft (31), and controls the moving amount | distance below this shaft (31).
It is characterized by that.

  According to the first aspect of the present invention, since the shaft is interposed between the universal joint and the work machine input portion, although it is a two-point hitch type coupling device, the folding angle of the universal joint can be reduced and the Power transmission to the work implement can be performed smoothly, and the front part of the shaft and the rear part of the universal joint are connected so as to be freely movable in the axial direction. It is possible to smoothly lift and lower the working machine, and the rear part of the shaft is supported so as to move up and down by a predetermined amount, so that the rear part of the shaft can be easily connected to the input part of the working machine. The work machines can be easily and reliably connected.

According to the present invention according to claim 2, is provided with the cover so as to cover the lower part of the shaft, the shaft, in particular as muddy water or the like is not applied to the rear and axially movably connected to answering spline section portion of the universal joint It is possible to protect and maintain a smooth rotation transmission of the shaft over a long period of time.

According to the third aspect of the present invention, since the restriction member for restricting the downward movement amount of the shaft is provided, the bending angle of the universal joint is restricted within a predetermined range, and the shaft and the connecting portion when the working machine is mounted Can be connected smoothly.

  Hereinafter, a working vehicle according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a side view of a tractor according to this embodiment before being connected to a rotary tiller, FIG. 2 is a plan view of the auto hitch according to this embodiment, and FIG. 3 is an auto hitch according to this embodiment. FIG. 4 is a perspective view of the auto hitch according to the present embodiment, and FIG. 5 is a side view showing the universal joint part before the rotary tiller according to the present embodiment is mounted. 6 is a side view showing the universal joint portion after the rotary cultivator according to the present embodiment is mounted, FIG. 7 is a sectional view of the shaft and the support rod according to the present embodiment, and FIG. 8 is the rotary according to the present embodiment. FIG. 9 is a cross-sectional view of the shaft and the support rod after the rotary tiller according to this embodiment is mounted.

  A tractor 1 shown in FIG. 1 is a working vehicle that performs farming of a farm field, and an auto hitch 5 (working unit connecting device) is attached to the rear of the body of the tractor 1 toward the rear. 2, a farming machine such as a rotary tiller 37 (working unit, working machine) as shown in FIG. 2 is attached (the rotary tiller 37 is hereinafter abbreviated as a rotary 37).

Tractor 1, towards the rear from the aft body has PTO shaft 2 projects, the distal end of PTO shaft 2, the front joints 3a ing from the U-shaped opening of the universal joint 3 with two folding portion And a 2P bracket 4 is provided around the PTO shaft 2 so as to surround it.

  The auto hitch 5 connected to the rear portion of the tractor 1 has a hitch frame 6 as a base, and a reverse U-shaped pipe frame 9 is installed at the rear portion of the hitch frame 6. An upper connection bracket 10 that is connected to the upper portion of the rotary 37 is provided at the upper end portion of the pipe frame 9, and lower connection portions 11, 11 are provided at the lower rear end portion.

  The lower connecting portions 11 and 11 are composed of hook plates 12 and 12 and lower connecting brackets 13 and 13. The lower connecting brackets 13 and 13 have U-shaped openings, and the key-type hook plates 12 and 12 positioned above the U-shaped openings are pivotally supported so as to be rotatable in the vertical direction.

  Further, the upper connecting bracket 10 described above is provided with a key-shaped hole, an operation lever 15 is passed through this hole, and hook plates 12 and 12 are connected to the tip of the operation lever 15. A spring 16 is hung on the operation lever 15 to urge the hook plates 12 and 12 downward.

  In addition, what consists of the hitch frame 6 mentioned above, the upper connection bracket 10 provided on the hitch frame 6, and the lower connection parts 11 and 11 is set as the mounting part 7 at the time of mounting the rotary 37.

  Square pipes 17, 17 are welded and fixed to the left and right lower portions of the mounting portion 7, and round pins 19, 19 connected to the U-shaped portion of the 2P bracket 4 are attached to the front ends of the square pipes 17, 17. , 20 are fixed. The square pipes 17 and 17 are pivotally supported by connecting portions provided at the rear part of the tractor 1 with the round pins 19 and 19 fixed to the tip portions as fulcrums, and rotate the entire auto hitch 5 in the vertical direction. . Further, in order to reinforce the entire auto hitch 5, reinforcing bars 21 and 21 are fixed so as to connect the square pipes 17 and 17 and the lower connecting brackets 13 and 13, respectively.

  Shafts 22 and 22 are disposed on the side surfaces of the square pipes 17 and 17, respectively, and a lift rod 52 and a lift arm 53 are pivotally supported on the shafts 22 and 22, and the auto hitch 5 is pulled up. Here, the square pipes 17 and 17 and the shafts 22 and 22 are configured as one connection portion 18 (connection device main body).

  On the other hand, brackets 26, 26 that support the rear end of the shaft 31 are extended from the pipe frame 9 at the center lower portion of the auto hitch 5, and these are connected and fixed by the pipe 25. The brackets 26 and 26 and the pipe 25 are fixed by welding to the square pipes 17 and 17 described above, respectively.

  A bearing holder 29 (supporting member) having a reverse U-shaped holding portion 8 on the left and right outer sides can be slid up and down by a predetermined amount on the pins 27 and 27 provided at the tips of the brackets 26 and 26. The shaft 31 is supported by a bearing 30 that is supported so as to be pivotable back and forth and is fixed to the bearing holder 29.

  The shaft 31 is provided with a spline portion 32 at the front end, and the rear joint 3b of the universal joint 3 attached to the PTO shaft 2 of the tractor 1 is slidably fitted. A hexagonal spline 33 (female) to which the input shaft 39 (connecting portion) of the rotary 37 is fitted is provided. The inlet portion of the hexagonal spline 33 is provided with a tapered guide portion, whereby the shaft 31 and the input shaft 39 can be smoothly connected.

  A cover 35 is screwed to the square pipes 17 and 17 by bolts 36, and a support bar 23 (regulating member) is welded and fixed to the cover 35. The front portion of the shaft 31 is supported by the support rod 23.

  The position where the shaft 31 is supported by the support rod 23 is such that when the rotary 37 is mounted, the input shaft 39 moves so that the input shaft 39 of the rotary 37 is smoothly fitted into the hexagonal spline 33 provided at the rear end portion of the shaft 31. The angle is adapted to the locus, and the weight of the assembly of the universal joint 3 and the shaft 31 is balanced, and slightly behind the spline on the universal joint 3 side which stabilizes the posture maintenance.

  Note that the hole when the cover 35 is attached using the bolt 36 is a vertically long hole, and the installation height of the shaft 31 can be adjusted, and the position of the input shaft 39 depending on the type of the rotary 37 and individual shape differences. Therefore, fine adjustment when the rotary 37 is mounted can be performed.

  Further, the cover 35 is attached to the lower portion of the auto hitch 5 so that the spline portion 32 on which the shaft 31 in the vicinity of the rear joint 3b slides is prevented from being splashed with muddy water or the like splashing from below.

  On the other hand, the rotary 37 as a work machine is provided with a gear case (not shown) at the center thereof. A chain case 40 is fixed to one of the left and right outer sides of the gear case, and a side plate 41 is fixed to the other outer side. A rotary cover 42 is fixed between the chain case 40 and the side plate 41. Yes. A rear cover 43 is swingably supported at the rear portion of the rotary cover 42.

  Top masts 45, 45 are fixed to the upper part of the gear case, and a connection pin 46 that is detachably fitted to the upper connection bracket 10 is supported between the top masts 45, 45. Further, one end of the lift arm 47 pivotally supported on one end of the top masts 45, 45 is pivotally supported on one end of the rear cover 43.

  An input shaft 39 that receives power transmission from the PTO shaft 2 via the universal joint 3 projects from the front surface of the gear case facing the tractor 1, and a lower connection bracket 49 is fixed so as to surround the input shaft 39. ing. On both the left and right sides of the lower connecting bracket 49, connecting pins 50, 50 that are detachably fitted to the lower connecting portions 11, 11 formed in the auto hitch 5 are fixed.

  Next, the operation when the rotary 37 is mounted on the tractor 1 via the auto hitch 5 will be described.

  First, when the rotary 37 is mounted on the tractor 1, the rotary 37 waits with the stand 51 standing behind the tractor 1. Then, the tractor 1 is moved backward toward the rotary 37 and brought close to a position suitable for mounting.

  Here, the top masts 45 and 45 of the rotary 37 are hung on the upper connection bracket 10 of the hitch frame 6 by rotating the lift arm 53 installed on the tractor 1 counterclockwise by driving means (not shown). Lift up (see FIG. 5). As a result, the rotary plate 37 is pulled up and rotated so that the hook plates 12 and 12 hold the connecting pins 50 and 50 and the lower connecting portions 11 and 11 are connected.

At the same time, in the transmission section of the auto hitch 5, the input shaft 39 on the rotary 37 side is smoothly fitted into the hexagonal spline 33 at the rear end of the shaft 31. The rear end portion of the shaft 31 is supported by a bearing holder 29 having an inverted U-shaped holding portion 8 so as to be movable up and down by a predetermined amount, and a tapered guide portion is provided at the inlet portion of the hexagonal spline 33. is further for splined portion 32 of the rear joint 3 b is slidable in the longitudinal direction, it is because the center alignment is performed while the deviation of Ryojikushin are adjusted as shown in FIG.

  Then, when the rotary 37 is mounted on the auto hitch 5 and the input shaft 39 is connected to the hexagonal spline 33 at the rear end of the shaft 31, the shaft 31 has a height L from the position of the support rod 23 as shown in FIG. Lifted. Further, as shown in FIGS. 6 and 9, since there is no bending angle from the universal joint 3 to the input shaft 39, and it is held at a substantially horizontal height, power transmission from the tractor 1 to the rotary 37 can be performed smoothly. become able to.

  Next, the operation when the rotary 37 is attached to the tractor 1 and the rotary 37 is pulled up will be described with reference to FIGS. FIG. 10 is a side view showing a state where the rotary tiller according to the present embodiment is pulled up, and FIG. 11 is a side view showing the universal joint when the rotary tiller according to the present embodiment is pulled up.

  For example, when changing the direction of the tractor 1 at the end of the field, the rotary 37 is pulled up so as not to roughen the part that has been worked. The operation at this time is performed by rotating the lift arm 53 counterclockwise by a driving means (not shown).

  That is, the auto hitch 5 is rotated counterclockwise about the pins 19 and 19 through the lift rod 52 by the rotation of the lift arm 53. Then, the connecting pin 46 fitted to the upper connecting bracket 10 and the connecting pins 50, 50 fitted to the lower connecting portions 11, 11 of the mounting portion 7 are pulled up, and the entire rotary 37 is pulled up as shown in FIG. .

  In the state where the rotary 37 is pulled up, the universal joint 3 bends as shown in FIG. 10 or FIG. 11, but the spline portion at the front end of the shaft 31 and the rear joint 3b are slidably fitted in the axial direction. Therefore, it is possible to absorb or disperse the stress applied in the front-rear direction at this time, and to absorb the change in the distance from the work implement, so that the work implement can be smoothly raised and lowered. It becomes like this.

  Further, since the rotary 37 is connected to the PTO shaft 2 of the tractor 1 via the shaft 31, the folding angle can be reduced as compared with the case where the rotary 37 is not used, so that the universal joint 3 or the like can be used. Can be reduced.

  As described above, according to the auto hitch 5 according to the present embodiment, the spline portion 32 at the front end portion of the shaft 31 and the rear joint 3b of the universal joint 3 are fitted so as to be slidable in the axial direction. Since the rear end portion of the shaft 31 is supported by the bearing holder 29 having the inverted U-shaped holding portion 8 so as to be movable up and down by a predetermined amount, the rear portion of the shaft 31 is easily connected to the input shaft 39 of the rotary 37. Thus, the rotary 37 can be easily and reliably connected.

  Further, according to the auto hitch 5 according to the present embodiment, the spline portion 32 at the front end portion of the shaft 31 and the rear joint 3b of the universal joint 3 are fitted to be slidable in the axial direction. By absorbing the change in the distance between the rear portion of the tractor 1 and the work machine as the machine moves up and down, the work machine can be raised and lowered smoothly.

  Further, according to the auto hitch 5 according to the present embodiment, when power is transmitted from the tractor 1 to the rotary 37, the shaft 31 installed in the auto hitch 5 is interposed between the universal joint 3 and the input shaft 39. Therefore, the bending angle of the universal joint 3 can be reduced, and the power transmission from the tractor 1 to the rotary 37 can be performed smoothly.

  Further, according to the auto hitch 5 according to the present embodiment, the support rod 23 that supports the shaft 31 and the cover 35 to which the shaft 31 is attached are provided, and the holes of the bolts 36 for attaching the cover 35 are formed as vertically long slots. Therefore, the vertical movement of the position where the shaft 31 is supported can be adjusted, and the difference in the position of the input shaft 39 due to the type of the rotary 37 to be connected and individual shape differences can be absorbed and finely adjusted. The rotary 37 can be easily and reliably connected.

  Further, according to the auto hitch 5 according to the present embodiment, the cover 35 is attached to the lower portion of the auto hitch 5 so that, for example, the cover 35 jumps up from below with respect to the spline portion on which the shaft 31 near the rear joint 3a slides. Since muddy water or the like can be prevented, smooth rotation transmission of the shaft 31 can be maintained for a long time.

  Further, according to the auto hitch 5 according to the present embodiment, the cover 35 attached to the lower portion of the auto hitch 5 is provided with the support rod 23 that supports the shaft 31, thereby reducing the amount of movement of the shaft 31 downward. Since it can be regulated, the bending angle of the universal joint 3 is regulated within a predetermined range, and the power transmission from the tractor 1 to the rotary 37 can be smoothly performed.

The side view before the connection of the auto hitch of a tractor and a rotary tiller concerning this Embodiment. The top view of the auto hitch concerning this Embodiment. The rear view which looked at the auto hitch concerning this Embodiment from the rotary tiller. The perspective view of the auto hitch concerning this Embodiment. The side view which shows the universal joint part before mounting | wearing of the rotary tiller concerning this Embodiment. The side view which shows the universal joint part after mounting | wearing with the rotary tiller concerning this Embodiment. Sectional drawing of the shaft and support bar concerning this Embodiment. The side view of the shaft and support bar before mounting | wearing with the rotary tiller concerning this Embodiment. Sectional drawing of the shaft and support rod after mounting | wearing with the rotary tiller concerning this Embodiment. The side view which shows the state which pulled up the rotary tiller concerning this Embodiment. The side view showing a universal joint when the rotary tiller concerning this Embodiment is pulled up.

Explanation of symbols

1 Tractor 2 PTO shaft 3 Universal joint 6 Auto hitch (connector body)
7 Mounting part 18 Connecting part (connecting device body)
23 Support rod (regulation member)
29 Bearing holder (supporting member)
31 Shaft 35 Cover 37 Rotary (Working part, working machine)
39 Input shaft (connecting part)
52 Lift rod 53 Lift arm

Claims (3)

Universally connected to the rear portion of the tractor by two connecting portions on the left and right sides, a connecting device main body connected to the lift arm of the tractor via a lift rod, and two fold portions connected to the PTO shaft of the tractor In the working unit coupling device for a tractor, which includes a joint and a mounting unit that is provided integrally with the coupling device main body and mounts the working unit.
A shaft having one end connected to the rear joint of the universal joint having the two bent portions and the other end connected to a connecting portion capable of transmitting power to the working machine;
The rear portion of the shaft is rotatably supported by a bearing holder that is connected to the mounting portion so as to move up and down by a predetermined amount, and the front portion of the shaft can be moved in the axial direction by a spline to the rear joint of the universal joint. Connected to
A tractor work machine coupling device characterized by the above. A cover is provided on the coupling device main body so as to cover the lower side of the shaft.
The tractor work machine coupling device according to claim 1. A regulating member that abuts the shaft and regulates the amount of movement of the shaft downward;
The tractor work machine coupling device according to claim 1 or 2.

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