JP2006191857A - Working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working vehicle ensuring preventing the breakage of a detective means such as a potentiometer set close to the mounting part of a working implement, even if being of small size. <P>SOLUTION: The working vehicle comprises a travel machine body having a working implement lifter and a working implement mounting device and a working implement 50 detachably mounted on the above device 21 and subject to vertical movement by the above lifter based on a ground sensor. In this vehicle, the mounting part on the working implement 50 side mounted on the device 21 is provided with a link arm 85 interlocking via a mechanical joining means with the ground sensor, and the above device 21 is equipped with a potentiometer 37 functioning to detect the movement of the working implement relative to the traveling vehicle, a link arm 31 engageable on the link arm 85, and a link mechanism 4 joining the link arm 31 and the potentiometer 37 to each other. As the potentiometer 37 is laid in front of the device 21, the potentiometer 37 can be prevented from breakage. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a work vehicle that performs work with a work machine mounted behind a traveling machine body.

  In a work vehicle in which a working machine such as a rotary (cultivator) is attached to the rear part of a traveling machine body such as a tractor and plowing or plowing is performed, the hitch device that detects the attitude of the working machine A first arm having an engagement portion is pivotally supported by a first support shaft at a rear end, and a second arm having an engagement portion fitted to the engagement portion of the first arm is second. The two spindles are made substantially the same in axis so as to be pivotable by the spindle. Then, the first arm and the second arm are rotated in the lateral direction and rotated about substantially the same axis, and the second arm is fixed by being linked so as to be able to come into and out of contact with each other. An angle detector (potentiometer) is mounted on a movable support shaft (see, for example, Patent Document 1).

JP-A-7-170807 (page 2-3, FIG. 3)

  A working vehicle such as a large tractor can secure a large space at the rear of the hitch and can be placed with a potentiometer. However, a working vehicle such as a small tractor has a smaller space at the rear of the hitch, and the potentiometer Placement becomes difficult. Further, since the potentiometer is positioned close to the second arm on which the work machine is mounted, there is a high risk that the work machine will collide with the potentiometer when the work machine is mounted, and the potentiometer will be damaged.

  In view of the above circumstances, an object of the present invention is to provide a working vehicle capable of preventing damage to a potentiometer or the like even if it is a small working vehicle.

  In order to achieve the above object, the present invention according to claim 1 is directed to a traveling machine body (2) having a work implement lifting device (6) and a work implement mounting device (21), and a detachable attachment to the work implement mounting device (21). A work vehicle (1) comprising: a work machine (50) that is freely mounted and raised and lowered by the work machine lifting and lowering device (6) based on a ground sensor (62). An engaging portion (85) interlocking with the ground sensor (62) via a mechanical connecting means is provided in the mounting portion on the work machine (50) side mounted on the work machine mounting device (21). The potentiometer (37) for controlling the work implement lifting device (6), the engaged portion (31) that can be engaged with the engaging portion (85), the engaged portion (31), and the potentiometer (37) provided with a link mechanism (45) for connecting, In a working vehicle, wherein the door.

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

  Since the potentiometer and the engaged part are connected via a link mechanism, the signal connecting part from the ground sensor can be configured compactly and can be stored even in a small space such as a small tractor. Through the mechanism, the detection amount of the ground sensor from the engaging part can be directly connected to the potentiometer, and the detection amount can be changed to a value adapted to the resolution of the potentiometer, and the lifting and lowering of the work machine based on the ground sensor can be performed with high accuracy. Control can be performed, and further, the potentiometer can be disposed on the traveling machine body side of the work implement mounting device, and the potentiometer can be prevented from being damaged.

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

  1 to 8 show a first embodiment of the present invention. FIG. 1 is a side view before mounting a tractor and a rotary. FIG. 2 is a side view showing a state of tillage work by a rotary. 3 is a rear view of the hitch device, FIG. 4 is a side view showing the main part of the mounting part on the hitch device side, FIG. 5 is a side view showing the main part of the mounting part on the rotary side, and FIG. FIG. 7 is a side view showing the main part of the mast on the rotary side, and FIG. 8 is a plan view showing the main part of the mounting part with the rotary mounted on the tractor.

  As shown in FIGS. 1 and 2, the work vehicle 1 includes a tractor 2 that is a traveling machine body and a rotary (work machine) 50 that is attached to the tractor 2. A hitch device 21 for mounting the rotary 50 is disposed.

  An elevating link mechanism 6 is disposed at the rear of the machine body 5 supported by a pair of front wheels (not shown) and a rear wheel 3 of the tractor 2. The elevating link mechanism 6 has a pair of lower links 7 rotatably supported below the machine body 5 and a top link 10 supported rotatably via a support 8 above the machine body 5. A hitch device 21 is supported at the rear ends of the lower link 7 and the top link 10.

  The lower link 7 is connected to a lift arm 11 that is rotationally driven by an actuator (not shown) disposed in the machine body 5 via a lift rod 12. And the hitch device 21 is moved up and down. The body 5 is provided with a yoke joint 15 for transmitting the power generated on the tractor 2 side to the rotary side.

  As shown in FIGS. 1 to 4, the hitch device 21 includes a hitch frame 22 in which a round pipe material is formed in a substantially inverted U shape, and an upper connecting portion 23 having a central portion fixed to the upper portion of the hitch frame 22. And a pair of left and right lower connecting portions 25 fixed to the lower end portion of the hitch frame 22.

  A front end side (the tractor 2 side in FIG. 1) of the upper connecting portion 23 is formed with a hole 23a that rotatably fits with a shaft 10a protruding from the top link 10, and a rear end portion of the rotary connecting portion 23a. A U-shaped hook portion 23b for mounting the is formed. Further, a shaft portion 25a that is rotatably fitted with a hole 7a formed in the rear end portion of the lower link 7 is formed on the front end side (the tractor 2 side in FIG. 1) of the lower connecting portion 25, and the rear portion Is formed with an engaging portion 25b formed of a U-shaped groove for mounting the rotary 50 thereon. And it is supported by the rear end of the elevating link mechanism 7 through the hole 23a and the shaft portion 25a.

  As shown in FIGS. 3 and 4, a plate 27 is formed in the vicinity of the lower engagement portion 25 on one side (left side in FIG. 3) of the beam 26 formed of a steel pipe and disposed in the center portion of the hitch frame 22. A fulcrum shaft 30 is fixed to one end of the bracket 28 fixed to the plate 27, and a central portion of the link arm 31 is rotatably supported on the fulcrum shaft 30. The link arm 31 constitutes an engaged portion that engages with an engaging portion described later on the rotary 2 side when the rotary 50 is mounted.

  As shown in FIGS. 1, 2, 4, and 8, a bracket 32 is integrally fixed to the plate 27 together with the bracket 28, and a scraping position detection switch 33 is fixed to the bracket 32. . A bracket 35 that is inclined toward the front lower side of the tractor 2 is fixed to the front end of the bracket 32, and a potentiometer 37 is fixed to the bracket 35 via a potentiometer mounting plate 36.

  The arm 38 of the potentiometer 37 is biased counterclockwise by a torsion spring 40 toward the set position. The link arm 31 and the potentiometer arm 38 are connected to a rod 43 via pins 41 and 42 so as to be rotatable, and the movement of the link arm 31 is transferred to the potentiometer 37 via the rod 43 and the arm 38. A transmission link mechanism 45 is configured.

  As shown in FIG. 3, a joint holder 47 is held via a pair of brackets 46 fixed to the hitch frame 22, and the rear end portion of the yoke joint 15 is held by the joint holder 47.

  As shown in FIGS. 1 and 2, the rotary 50 includes a cultivating unit 51 that performs a cultivating operation, a detecting unit 71 that detects the height of the surface of the cultivated field and transmits it to the potentiometer 37, and a plowing operation. And a switching unit 91 for operating the scraping position detection switch 33 at the time of setting.

  As shown in FIGS. 1, 2, and 6, the tilling portion 51 has a top mast 53 fixed to an upper portion of a gear case 52, a left support arm 55 (on the right side in FIG. 6) and a right support arm 56 on a side surface. (Left side of the paper surface in FIG. 6) is fixed. Side plates (not shown) and chain cases 57 are fixed to the outer ends of the left and right support arms 55 and 56, respectively, and are attached to a tilling shaft (not shown) rotatably supported by the side plates. A rotary claw 58 is fixed.

  The cover that covers the rotary claw 58 is configured to cover the front, upper, and side surfaces of the rotary claw 58, and a main cover 60 that is rotatably supported by the cultivating shaft, and a rear of the rotary claw 58. The rear cover 62 is configured to cover and is rotatably supported by the main cover 60 via a shaft 61, and a bracket 63 is fixed to the upper rear portion of the main cover 60. The rear cover 62 also serves as a ground sensor for detecting the position of the rear end of the rear cover 62 that is in contact with the surface of the cultivated soil.

  The top mast 53 is provided with a pin 65 which engages with a hook portion 23b formed on the upper connecting portion 23 of the hitch device 21 at an upper end portion thereof, and a hitch device 21 via a plate 66 at the lower portion thereof. A pin 67 that engages with the engaging portion 25b formed in the lower connecting portion 25 is disposed.

  As shown in FIG. 1 and FIG. 2, the detection unit 71 is supported on the detection side so that one end of the detection unit 71 is rotatably supported by the rear cover 62 and is rotatably supported by the bracket 63 of the main cover 60. 72 is slidably passed through the suspension rod 73, one end of which is rotatably connected to the rear cover 62 via a pin 74, and a mounting bracket 75 fixed to the upper end of the suspension rod 73. It has a compression spring 77 attached to a shaft 76 that is supported by penetration, and a push-pull wire 78 connected to the shaft 76.

  As shown in FIGS. 1, 2, 6, and 8, the detection unit 71 is fixed to the left support arm 55 on the operating side, and a bracket 80 that fixes the outer wire of the push-pull wire 78, and the left A link arm 85 whose central portion is rotatably supported by a plate 82 fixed to the support arm 55 via a shaft 83, and a twist that is attached to the shaft 83 and applies rotational force to the link arm 85. And an inner wire of the push-pull wire 78 is rotatably connected to one end of the link arm 85 via a pin 81.

  The other end of the link arm 85 constitutes an engaging portion corresponding to the engaged portion of the link arm 31 of the hitch device 21 when the rotary 50 is mounted on the tractor 2.

  As shown in FIGS. 1, 2, and 5 to 8, the switching portion 91 includes a shaft 92 rotatably supported by the top mast 53 and a shaft 93 on a bracket 92 a protruding from the shaft 92. And a torsion spring 96 for applying a turning force to the turning operation lever 95. In addition, a guide groove 53 a is formed on the side surface of the top mast 53 so that the turning operation lever 95 can move therethrough. The guide groove 53a is radially formed with three grooves for locking the rotation operation lever 95 at each operation position of the deep tillage position A, the shallow tillage position B, and the alternative scraping position C.

  A rotating rod 100 is rotatably connected to one end of a rotating arm 97 fixed to the shaft 92 via the bracket 92a via a pin 98. The other end of the rotating rod 100 is The main cover 60 is rotatably connected to the rear part. The other end of the rotating arm 97 is disposed so as to oppose the scraping position detection switch 33 of the hitch device 21 when the rotary 50 is mounted on the tractor 2. A rib 97a is formed to project from the lower portion of the rotating arm 97.

  A switch plate 101 is rotatably supported at the front lower end portion of the top mast 53 via a shaft 102 and is urged rearward by a return spring 103. The rear end of the switch plate 101 faces the rib 97a of the rotating arm 97, and when the rotating operation lever 95 is operated to the scraping position C, the switch plate 101 is pushed forward by the rib 97a, and the scraping position detection switch 33 is activated.

  Since it is the said structure, as shown in FIG. 1, the rear part of the tractor 2 is made to oppose the front surface of the rotary 50 arrange | positioned in the field, and the hook part 23b of the upper connection part 23 is in the state which lowered the hitch device 21. Retracts the tractor 2 to a position facing the pin 65 of the top mast 53. In this state, the lift arm 11 is rotated, and the hitch device 21 is rotated upward via the lifting link mechanism 6.

  Then, the hook portion 23b of the upper connecting portion hooks the pin 65 and pulls the pin 65 upward and forward. Accordingly, the rotary 50 is pulled forward (to the tractor 2 side), the pin 67 is fitted into the engaging portion 25b of the lower connecting portion 25 of the hitch device 21, and the rotary 50 is attached to the tractor 2.

  At this time, the link arm 31 of the hitch device 21 and the link arm 85 of the rotary 50 are engaged. On the other hand, when the rotation operation lever 95 is in the deep tillage position A or the shallow tillage position B other than the substitute scraping position C, the switch plate 101 faces the substitute scraping detection switch 33 with a predetermined gap and is in the substitute scraping position C. Sometimes it is in a position to engage with the scratching detection switch 33.

  The rotary operation lever 95 is set to the deep tillage position A or the shallow tillage position B, and the tractor 2 is moved forward with the rotary pawl 58 rotated to perform the tilling work. At this time, when the rear end of the rear cover 62 that contacts the upper surface of the cultivated field rotates in the vertical direction, the rotation of the rear cover 62 is applied to the link arm 85 via the suspension rod 73, the shaft 76, and the push-pull wire 78. Then, the link arm 85 is rotated.

  The rotation of the link arm 85 is transmitted to the link arm 31 and operates the potentiometer 37 via the link mechanism 45. The output of the potentiometer 37 is sent to a control unit (not shown) constituted by a microcomputer (microcomputer), and is output as a control amount of the lift arm 11 from the control unit. The lift arm 11 rotates according to the output of the control unit and controls the height of the rotary 50 via the lifting link mechanism 6 to perform stable tillage work.

  When performing the scraping work after the tilling work is completed, the rotation operation lever 95 is operated to the scraping position C. Then, the rotation arm 97 rotates and pushes the switch plate 101 with the rib 97a. The switch plate 101 pushed by the rib 97a rotates counterclockwise and pushes the hand scraping position detection switch 33. The output of this scraping detection switch 33 is input to the control unit, the response sensitivity to the output of the potentiometer 37 is dulled, and the influence of unevenness on the field can be reduced to perform stable scraping work.

  As described above, since the potentiometer 37 and the link arm 31 are connected via the link mechanism 45, the signal connecting portion from the rear cover 62 can be made compact. Therefore, even a small space such as a small tractor can be stored. In addition, the detection amount of the rear cover 62 from the link arm 85 can be directly connected to the potentiometer 37 via the link mechanism 45, and the detection amount can be changed to a value adapted to the resolution of the potentiometer 37, and the rear cover 62 can be changed with high accuracy. Therefore, the potentiometer 37 can be disposed on the tractor 2 side of the hitch device 21 to prevent the potentiometer 37 from being damaged.

  FIG. 9 shows a second embodiment of the present invention and is a side view showing the main part of the mounting portion on the hitch device side.

  In this figure, the same components as those in FIG. In this embodiment, a hydraulic valve (not shown) connected to a hydraulic actuator (not shown) for driving the lift arm 11 is directly controlled by the rotation of the rear cover 62 in the above embodiment. A wire holding plate 105 fixed to the plate 27 and a push-pull wire 106 having one end connected to the link arm 31 and held by the wire holding plate. An end is connected to the hydraulic valve.

  Even in such a configuration, by opening and closing the discharge port of the hydraulic valve directly or via another link mechanism with the push-pull wire 106, the same operation and effect as in the above embodiment can be obtained.

It is a side view before mounting | wearing with a tractor and a rotary. It is a side view which shows the cultivation work state by rotary. It is a rear view of a hitch device. It is a side view which shows the principal part of the mounting part by the hitch apparatus side. It is a side view which shows the principal part of the mounting part by the side of a rotary. It is a front view of the mounting part on the rotary side. It is a side view which shows the principal part of the mast on the rotary side. It is a top view which shows the principal part of the mounting part which mounted | wore the tractor with the rotary. It is a side view which shows the principal part of the mounting part by the hitch apparatus side.

Explanation of symbols

1 Working vehicle 2 Traveling body (tractor)
6 Work implement elevating device (elevating link mechanism)
21 Work implement mounting device (hitch device)
31 engaged part (link arm)
37 Potentiometer 45 Link mechanism 50 Working machine (rotary)
62 Ground sensor (rear cover)
85 Engagement part (link arm)

Claims (1)

A traveling machine body having a work machine lifting device and a work machine mounting device;
In a working vehicle comprising: a work machine that is detachably attached to the work machine mounting device and is lifted and lowered by the work machine lifting device based on a ground sensor,
An engagement portion that interlocks with the ground sensor via a mechanical connection means is provided on the attachment portion on the work implement side that is attached to the work implement attachment device,
The work implement mounting device includes a potentiometer that controls the work implement lifting device, an engaged portion that can be engaged with the engaging portion, and a link mechanism that connects the engaged portion and the potentiometer. Provided,
A working vehicle characterized by that.

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