JP4417126B2 - Work equipment coupling device in work vehicle - Google Patents

Description

  The present invention relates to a work implement coupling device provided at a front portion or a rear portion of a work vehicle.

Conventionally, at the rear part of a tractor as a work vehicle, a three-point link device comprising a top link and left and right lower links is provided as a work implement connecting device. A work machine such as a plow is connected, and left and right lift arms are connected to left and right lower links via lift rods so that the work machine can be raised and lowered. In addition, a stabilizer that connects the tractor body and the middle part of the left and right lower links is provided, so that the amount of expansion of the left and right lower links can be adjusted by the stabilizer according to changes in the mounting form depending on the type and type of work equipment. In addition, there is known a configuration in which the stabilizer is configured to restrict the left and right lower links from swinging, that is, to restrict the left and right swinging of the work machine (for example, see Patent Document 1).
JP 2003-299402 A (page 3, FIG. 2)

  In the conventional stabilizer having the telescopic adjustable telescopic double structure described above, a desired locking hole is selected from a plurality of locking holes respectively provided on the outer cylinder side and the telescopic side of the stabilizer. By inserting a locking pin into the locking hole, the amount of expansion of the left and right lower links can be adjusted according to the change in the mounting form depending on the type and model of the work machine.

  In addition, when working with a work machine such as a plow, cultivator, or earthenware device connected to the work machine coupling device, the work machine should be allowed to swing to some extent by following the travel of the tractor. In addition, among the plurality of locking holes provided on the outer cylinder side and the nesting side of the stabilizer, for example, a predetermined locking hole on the nesting side is formed as an elongated hole. By inserting a locking pin into a corresponding locking hole on the outer cylinder side, the left and right lower links are allowed to swing by an amount corresponding to the elongated hole.

However, in the case where the above-mentioned swinging of the working machine is allowed to some extent, if a load is applied to the stabilizer via the left and right lower links due to the swinging of the working machine, the lower link of the working machine to be connected in particular. Depending on the mounting width, a compressive load may be applied to one stabilizer. Thus, if a compressive load is applied to one stabilizer before a tensile load is applied to the other stabilizer, buckling may occur in that stabilizer. It was.

The present invention was devised for the purpose of solving the above-described problems, and is a work vehicle including left and right stabilizers that connect a machine body and a middle part of a lower link to restrict left-right swinging of a work machine. A work machine coupling device, wherein the stabilizer is constituted by a cylindrical body and a casing fitted to the cylindrical body, and a plurality of round holes and long holes are formed at a predetermined pitch in the sliding direction in both of them, By inserting a locking pin into one of these corresponding round holes formed on both, the work machine mounting width at the rear end of the lower link is set to match the work machine. Left and right movements of the working machine are restricted, and a locking pin is inserted into the long hole formed in both, thereby allowing the working machine to swing left and right by an amount corresponding to the long hole. A locking pin was inserted into one of the holes In the range corresponding to the working machine mounting width, the slide on the compression locking end side slides against the sliding stroke on the tension locking end side where the long holes and the locking pin lock as the work machine swings left and right. The stroke is always set to be large, so that when using a long hole, the tensile load is always applied in accordance with the work machine mounting width when the locking pin is inserted into one of the round holes. It is characterized by supporting the swinging of the working machine with only the stabilizer on the working side .

According to the present invention, the swinging of the working machine is supported only by the stabilizer on the tensile load acting side, and the swinging of the other side is restricted so that the compressive load is not applied to the stabilizer on the other side. In addition, since it is not necessary to construct the stabilizer more firmly than necessary so as to withstand buckling, the work implement coupling device can be provided at low cost.

In addition, because the stabilizer is constituted by the cylinder and the casing fitted to the cylinder, and the swing restricting means of the work machine is constituted by the long hole formed in both and the locking pin inserted through both the long holes, It is possible to simply provide the swinging restricting means for the stabilizer without increasing the cost.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a three-point link type work machine coupling apparatus A to which the present invention is applied, and FIG. 2 is a plan view of the same. The three-point link type work machine coupling apparatus A will be described in detail later. It is composed of two lower links 7L, 7R, one top link 8, lift rods 6, 6 and the like.

  The rear axle cases 2 and 2 are integrally fixed to the left and right sides of the transmission case 1 constituting the tractor body, and the hydraulic housing case 3 is placed on the upper side of the transmission case 1. Lift arms 5 and 5 are attached to both sides of a lift shaft 4 pivoted on the hydraulic housing case 3, and lift rods 6 and 6 are connected to the ends of the lift arms 5 and 5, and the lift rod 6 , 6 are connected to the middle portions of the left and right lower links 7L, 7R.

  A top link 8 is swingably attached to the rear portion of the hydraulic housing case 3, and a desired working machine can be mounted (connected) to the top link 8 and the rear ends of the left and right lower links 7L and 7R. It is like that. The lift arms 5 and 5 are configured to be pivotable up and down via a lift cylinder (not shown) built in the hydraulic housing case 3, and the left and right lower arms are connected via lift rods 6 and 6 connected to the lift arms 5 and 5. The links 7L and 7R are rocked up and down so that the working machine moves up and down.

  Further, in the three-point link type work machine connecting device A, in order to limit the left and right swing of the work machine, the connecting pins 9 and 9 provided in the rear axle cases 2 and 2 and the middle portions of the left and right lower links 7L and 7R are provided. And left and right stabilizers 10L and 10R. The stabilizers 10L and 10R have a telescopic adjustable nested double structure. As shown in FIG. 3, the lower link 7 side of the stabilizer 10 is formed with a plate 11a having a U-shaped cross section. The plate 11b that closes the open side of the plate 11a is integrally welded to form the cylinder 11. On the other hand, the rear axle case 2 is fitted into the cylinder 11 and slidable as shown in FIG. A plate 12a, a housing 12 formed by welding a U-shaped plate 12b to an end of the plate 12a, and a connecting bracket 14 rotatably connected to the U-shaped plate 12a via a pin 13. I have.

  Moreover, the cylindrical body 11 mentioned above and the housing 12 fitted to this cylindrical body 11 are provided with circular holes H1 to H6 having the same diameter corresponding to each other and a long hole HL having substantially the same shape in a predetermined direction in the sliding direction. A hole is selected from among the round holes H1 to H6 corresponding to both 11 and 12 or the long hole HL, and a locking pin 15 is inserted into the hole as shown in FIG. By inserting, the mounting width suitable for the working machine to be attached (connected) to the three-point link working machine coupling device A, that is, the working machine at the rear end portions of the left and right lower links 7L and 7R shown in FIG. The attachment width W can be set. In addition, the mounting | wearing flexibility at the time of mounting | wearing a working machine is given by the connection metal fitting 14 connected with the housing | casing 12 so that rotation was possible.

  When the rotary tiller is mounted (connected) as a work machine to the three-point link type work machine connecting apparatus A, the rotary tiller does not need to allow the swinging of the work machine in particular. Select an appropriate hole from the round holes H1 to H6 formed in the cylindrical body 11 and the housing 12 so that the mounting width W (see FIG. 2) of the working machine with the least horizontal play is suitable. What is necessary is just to connect the cylinder 11 and the housing 12 by inserting the locking pin 15 in the hole.

  Further, when a work machine such as a plow or a cultivator is connected to the three-point link type work machine connecting apparatus A and is pulled by a tractor, the work machine swings left and right (swings) to some extent following the traveling of the tractor. As described below, the rocking restricting means M that allows rocking on the left and right stabilizers 10L and 10R side is provided as described below.

  As shown in FIGS. 6 to 8, the swing restricting means M is formed in substantially the same shape on the cylindrical body 11 constituting the left and right stabilizers 10 </ b> L and 10 </ b> R and the housing 12 fitted on the cylindrical body 11. The long hole HL and the locking pin 15 inserted into the long hole HL formed in both 11 and 12 are configured. Then, by the left and right stabilizers 10L and 10R in a state where the locking pins 15 are inserted into both the long holes HL, the work machine mounting width W1 at the rear end portions of the left and right lower links 7L and 7R shown by the two-dot chain line in FIG. The working machines such as the plows and cultivators described above can be mounted (connected) to the three-point link type work machine connecting device A.

  Further, FIG. 6 shows that a working machine (not shown) mounted (connected) to the three-point link type working machine coupling device A receives earth pressure and swings from the left side to the right side as indicated by arrows S1 and S2 in the figure ( In this state, the cylinder 11 constituting the left stabilizer 10L is pulled and slid in the direction of arrow T in the figure. Then, as shown in FIG. 7, when the long holes HL formed in the cylindrical body 11 and the casing 12 constituting the left stabilizer 10 </ b> L are locked on the tensile locking end side via the locking pins 15. The cylindrical body 11 becomes non-slidable and further swinging of the left lower link 7L is restricted.

  On the other hand, the cylinder 11 constituting the right stabilizer 10R slides in the direction of arrow C in the drawing, that is, in the compression direction opposite to the cylinder 11 constituting the left stabilizer 10L. At this time, as shown in FIG. A free state in which the long holes HL formed in the cylindrical body 11 and the casing 12 constituting the 10R and the locking pins 15 inserted through the long holes HL are not yet locked is maintained. That is, the locking pin 15 is not sandwiched between the long holes HL, and a compression load is not applied to the right stabilizer 10R itself.

  As described above, the work implement mounted (connected) to the three-point link type work machine coupling device A by the rocking restricting means M provided on the left and right stabilizers 10L and 10R follows the tractor travel to a certain extent. In addition, the horizontal swing of the working machine is supported only by the stabilizer on the tensile load acting side (10L in the embodiment), and the other side stabilizer (10R in the embodiment) is not subjected to a compressive load. Because the swing is restricted, the stabilizer does not buckle, and it is not necessary to configure the stabilizer more firmly than necessary so that it can withstand buckling. Can do.

    The swing restricting means M includes a long hole HL formed in the cylindrical body 11 constituting the stabilizers 10L and 10R and a housing 12 fitted in the cylindrical body 11, and a latch inserted through both the long holes HL. Since the pins 15 can be easily configured, the stabilizers 10L and 10R can be provided without causing an increase in cost.

  And as concretely illustrated in FIG. 9, for example, the working machine mounting width W1 is in the range of 716 mm to 770 mm, that is, the cylindrical body 11 constituting the left and right stabilizers 10L and 10R, and the casing fitted to the cylindrical body 11 In the range corresponding to the work machine mounting width W1 when the locking pin 15 is inserted into the round holes H4, H3, H2, and H1 formed with each other, the cylinder 11 and the casing 12 that are the swing restricting means M In contrast to the slide stroke (W1 = 716 mm, tension side stroke 5 mm) on the side of the tension lock where the long holes HL and the lock pin 15 formed on each other are locked as the work machine swings left and right. The slide stroke (W1 = 716 mm, compression side stroke 18 mm) on the compression locking end side is set to be always large, thereby various working machine mounting widths W1 (716 mm to 7 mm). To adapt to 0 mm), and so as to support the right and left swinging of the working machine only always tensile load acting side stabilizer.

  Of the plurality of locking holes provided on the outer cylinder side and the nesting side of the stabilizer, for example, a predetermined engagement on the nesting side, such as a conventional stabilizer having a telescopic adjustable double telescopic structure. By forming a stop hole into a long hole and inserting a lock pin into the long hole on the telescopic side and the corresponding lock hole on the outer cylinder side, the left and right lower links can be moved by an amount corresponding to the long hole. In the case where the vibration is to be allowed, the length of the elongated hole is further expanded in the sliding direction to increase the allowable amount of the left and right lower links to suppress the occurrence of buckling of the stabilizer, but it is adjacent to the elongated hole. There is a limitation due to interference with the locking holes and a decrease in strength due to a decrease in the distance between the elongated holes and the locking holes, and the stabilizers 10L and 10R have the cylindrical body 11 side and the housing 12 as in the present invention. Long holes HL on each side These problems are solved by kicking.

The side view of a working machine coupling device. The top view of a working machine coupling device. The plane and side view of the cylinder which comprise a stabilizer. The top view and front view of the housing which comprise a stabilizer. Sectional drawing which shows the connection state of the cylindrical body and housing which comprise a stabilizer. The top view which shows the left-right rocking | fluctuation state of the working machine with which the working machine connection apparatus was mounted | worn. The top view which shows the operation state of the left side stabilizer by the right-and-left swing of a working machine. The top view which shows the operation state of the right side stabilizer by the right-and-left swing of a working machine. The top view which shows the effect | action form of a rocking | fluctuation control means.

Explanation of symbols

7L lower link (left)
7R Lower link (right)
10L Stabilizer (Left)
10R Stabilizer (Right)
11 cylindrical body 12 housing 15 locking pin M swing restricting means HL long hole

Claims (1)

A work machine coupling device in a work vehicle including left and right stabilizers (10L, 10R) for connecting a machine body and a middle part of a lower link (7L, 7R) to restrict left-right swinging of the work machine, the stabilizer (10L, 10R) is composed of a cylindrical body (11) and a casing (12) fitted to the cylindrical body (11), and a plurality of round holes (H1 to H6) and long holes in both (11, 12). (HL) is formed at a predetermined pitch in the sliding direction, and a locking pin (15) is inserted into any one of these corresponding round holes (H1 to H6) formed in both (11, 12). , The working machine mounting width (W) at the rear end of the lower link (7L, 7R) is set to be suitable for the working machine, and the horizontal swing of the working machine is restricted. 11 and 12) are fixed to the long holes (HL). By inserting (15), the working machine is allowed to swing left and right by an amount corresponding to the long hole (HL), and a locking pin ( 15) Tensile locking in which both the long holes (HL) and the locking pins (15) are locked with the swinging of the working machine within the range corresponding to the working machine mounting width (W) when the working machine is inserted. One of the round holes (H1 to H6) when the long stroke (HL) is used by setting the slide stroke on the compression locking end side to be always larger than the slide stroke on the end side. Adapting to the work machine mounting width (W) when the locking pin (15) is inserted into the hole, always support the swinging of the work machine with the stabilizer (10L, 10R) on the tensile load acting side. A work machine coupling device for a work vehicle.

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