JP5186452B2 - Farm machine operation device - Google Patents

Description

  The present invention relates to an operating device for an agricultural working machine such as a rotary tiller towed by a tractor, and more particularly to an operating device for an agricultural working machine that operates an elevating actuator to move an agricultural machine up and down.

  2. Description of the Related Art Conventionally, a farm work machine is mounted on a work vehicle having front wheels and rear wheels through a link mechanism so as to be movable up and down. By operating the position control lever or the draft control lever, the farm equipment connected to the work vehicle via the link mechanism is moved up and down to adjust the height of the farm equipment to the ground (cultivation depth). (For example, see Patent Document 1)

Japanese Utility Model Publication No. 6-28387

  In the conventional technology, when the position control lever or the draft control lever is supported at the operation position by using the frictional force of the disc spring or the like, in the position control lever specification, the adjustment of the operation force of the position control lever is two. The friction plate was tightened with the friction bolts, and the friction plate was fixed with four nuts. In the draft control lever specification, the operating force was adjusted by two friction bolts and two friction nuts, and the friction plate was fixed by four nuts. That is, in the adjustment operation of the lever operating force, there are many bolting and nut tightening operation parts, and there are problems in handling such as troublesome assembly work.

  An object of the present invention is to provide an operating device for an agricultural machine that can greatly reduce the number of assembly steps such as a position control lever or a draft control lever.

  In order to achieve the above object, the operating device for an agricultural machine according to the first aspect of the present invention is attached to a traveling machine body movably supported by front wheels and rear wheels so that the agricultural machine can be moved up and down via a link mechanism. A single position for adjusting the operating force of the position control lever in an operating device for an agricultural machine comprising an elevating actuator for elevating and lowering the agricultural machine and a position control lever for operating the elevating actuator. And a single position nut for fixing the position friction bolt. The position friction lever is tightened to adjust the operating force of the position control lever. Constructed to fasten friction bolts Those were.

  Invention of Claim 2 is a structure provided with the draft control lever which controls the draft operation | movement of the said agricultural working machine in the operating device of the agricultural working machine of Claim 1, Comprising: Operation force of the said draft control lever is provided. A draft disc spring to be adjusted, a single draft bolt for adjusting the operating force of the draft control lever, and a single draft friction nut are provided, and the draft friction nut is tightened to operate the draft control lever. It is configured to adjust the force.

  According to a third aspect of the present invention, in the operating device for an agricultural machine according to the first aspect, a position disc spring for adjusting the operating force of the position control lever and a plate support bolt for supporting the position friction plate are provided. In this structure, a plate support collar is fitted on the plate support bolt, and a lever stopper for limiting the operation range of the position control lever is also used as the plate support collar.

  According to the invention which concerns on Claim 1, it mounts | wears with a traveling machine body movably supported by the front wheel and the rear wheel so that raising and lowering is possible via a link mechanism, and the raising / lowering motion which raises / lowers the said agricultural working machine In an operating device for an agricultural machine comprising an actuator and a position control lever for operating the lifting actuator, a single position friction bolt for adjusting the operating force of the position control lever, and the position friction bolt A single position nut to be fixed, the position friction bolt is tightened to adjust the operating force of the position control lever, and the position friction bolt is fixed by the position nut. Therefore, the position control The assembling steps and roll lever can be greatly reduced, thereby improving the adjustment of the operating force, such as the position control lever.

  According to the invention which concerns on Claim 2, It is a structure provided with the draft control lever which controls the draft operation | movement of the said agricultural working machine, Comprising: The draft disk spring for adjusting the operating force of the said draft control lever, The said draft control lever A single draft bolt and a single draft friction nut that adjust the operating force of the draft control lever, and the draft control nut is tightened to adjust the operating force of the draft control lever. The number of assembling steps such as the draft control lever, the draft disc spring, and the draft friction nut can be greatly reduced, and the adjustment workability of the operating force of the draft control lever can be improved.

  According to a third aspect of the present invention, there is provided a structure comprising a position disc spring for adjusting the operating force of the position control lever, and a plate support bolt for supporting the position friction plate, wherein the plate support bolt has a plate. Since the support collar is fitted and the lever stopper for limiting the operation range of the position control lever is also used in the plate support collar, the assembly man-hour for the position control lever, etc. is greatly increased. It is possible to reduce, and the adjustment workability of the operation force such as the position control lever can be improved. Further, since the lever stopper is also used as the plate support collar, the operation range of the position control lever can be easily limited, the number of components can be reduced, and the manufacturing cost can be reduced.

It is a side view of the tractor of a 1st embodiment of the present invention. It is the same top view. It is a side view of the raising / lowering mechanism for working machines provided with the position control lever and the draft control lever. It is the same top view. It is the same front view. It is the elements on larger scale of FIG. It is a principal part expanded sectional view of the raising / lowering mechanism for working machines provided with the position control lever and the draft control lever. It is a side view of the raising / lowering mechanism for working machines provided with the position control lever. It is the same partial expanded sectional view.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings when applied to a farm tractor equipped with a rotary tiller as a farm work machine. 1 is a side view of the tractor, FIG. 2 is a plan view of the tractor, FIG. 3 is a side view of a hydraulic working machine lifting mechanism, and FIG. 4 is a plan view of the tractor. As shown in FIGS. 1 and 2, the tractor 1 supports the traveling machine body 2 with a pair of left and right front wheels 3 and a pair of left and right rear wheels 4. The rear wheel 4 and the front wheel 3 are driven by the engine 5 mounted on the front part of the traveling machine body 2 to move forward and backward. The engine 5 is covered with a bonnet 6. A cabin 7 is installed on the upper surface of the traveling machine body 2. Inside the cabin 7, a steering seat 8 and a steering handle 9 for moving the front wheel 3 to the left and right by steering are installed. A step 10 on which the operator gets on and off is provided on the outer side of the cabin 7. A fuel tank 11 that supplies fuel to the engine 5 is provided inside the step 10 and below the bottom of the cabin 7.

  As shown in FIGS. 1 and 2, the traveling machine body 2 includes an engine frame 14 having a front bumper 12 and a front axle case 13, and left and right machine frame detachably fixed to the rear portion of the engine frame 14 with bolts. 16. A mission case 17 is connected to the rear portion of the body frame 16 for transmitting the rotation of the engine 5 to the rear wheels 4 and the front wheels 3 with appropriate speed change. The rear wheel 4 is attached to the mission case 17 via a rear axle case (not shown) mounted so as to protrude outward from the outer surface of the mission case 17.

  As shown in FIGS. 1 to 5, a hydraulic working machine lifting mechanism 20 for lifting and lowering a rotary tiller 24 as an agricultural working machine is attached to the upper surface of the rear portion of the mission case 17. The rotary cultivator 24 is connected to the rear portion of the mission case 17 via a three-point link mechanism 23 including a pair of left and right lower links 21 and a top link 22. The front end side of the left and right lower link 21 is rotatably connected to the left and right side surfaces of the rear portion of the mission case 17 via a lower link pin (not shown). The front end side of the top link 22 is connected to a top link hitch 26 at the rear of the work machine lifting mechanism 20 via a top link pin (not shown). Further, a PTO shaft 25 for transmitting a PTO driving force to the rotary tiller 24 is projected rearward on the rear side surface of the mission case 17.

  As shown in FIGS. 1 to 5, the hydraulic working machine lifting mechanism 20 is rotated by a single-acting lifting control hydraulic cylinder (not shown) built in the working machine lifting mechanism 20. A pair of left and right lift arms 29 are installed. The lower link 21 and the lift arm 29 on the left side in the traveling direction are connected via a left lift rod 30. The lower link 21 and the lift arm 29 on the right side in the traveling direction are connected via a right lift rod 31 and a double-acting tilt control hydraulic cylinder 32 that forms a part of the rod 31.

  As shown in FIG. 1, the rear end sides of the pair of left and right lower links 21 are connected to the front end sides of the left and right lower link frames 34 connected to the main beam 36 of the rotary tiller 24 via lower hitch pins 34a. . The rear end side of the top link 22 is connected to the front end side of the upper link frame 35 connected to the main beam 36 via the upper hitch pin 35a.

  As shown in FIGS. 1 and 2, the rotary cultivator 24 includes a chain case 37 and a bearing plate 38 connected to the left and right ends of the main beam 36, respectively, and a chain case 37 and a bearing plate 38 at the lower ends thereof. A plurality of detachable cultivating claws 40 that are attached to a cultivating claw shaft 39 rotatably supported at both left and right ends, and a cultivating upper surface cover 41 that is disposed so as to cover the rotation trajectory of the cultivating claw 40. The left and right tillage side covers 42 arranged so as to cover the left and right sides of the rotation trajectory of the tilling claw 40, the tilling rear cover 43 arranged so as to cover the rear of the rotation trajectory of the tilling claw 40, and the main beam 36 at the front end Tilling depth adjustment frame 44 attached to the rear side and attached to the rear end side of the upper link frame 34 and the intermediate portion in the front-rear direction of the tilling depth adjustment frame 44. With a 45 and the like.

  When the tilling depth adjusting shaft 45 is expanded and contracted by rotating the tilling depth adjusting handle 45a, the rotary tiller 24 supported by the lower link 21 and the top link 22 changes to the forward tilted posture or the backward tilted posture. Then, the tilling depth by the tilling claws 40 is changed.

  As shown in FIGS. 1 and 2, a gear case 46 for inputting a driving force from the PTO shaft 25 is disposed at the center of the left and right of the main beam 36. A PTO input shaft on the front side of the gear case 46 is connected to the PTO shaft 25. The power from the PTO shaft 25 is transmitted to the tilling claw 40 through a bevel gear (not shown) incorporated in the gear case 46, and the tilling claw 40 is rotated counterclockwise in FIG.

  Next, the arrangement of the driving operation means will be described with reference to FIGS. As shown in FIGS. 1 and 2, the steering handle 9 is disposed on the steering column 60 on the floor plate 59 in front of the steering seat 8 in the cabin 7 (operating unit). A throttle lever 58 and left and right brake pedals 61 are disposed on the right side of the steering column 60. A clutch pedal 62 is arranged on the left side of the steering column 60. On the right column of the control seat 8, a position control lever 63 that moves the rotary tiller 24 up and down, a draft control lever 64 that performs on / off switching of the work implement lifting control and control sensitivity setting, and the like are arranged. A traveling speed change lever 65 for changing the vehicle speed is disposed on the left column of the control seat 8. In front of the left column of the control seat 8, a differential lock pedal 66 for turning on and off the differential drive of the left and right rear wheels 4 is disposed.

  Next, with reference to FIGS. 3 to 7, the arrangement structure of the lifting mechanism 20 for the work implement, the position control lever 63, the draft control lever 64, and the like will be described. As shown in FIGS. 3 to 6, a position control lever 63 and a draft control lever 64 are arranged on the right side of the hydraulic housing 70 of the working machine lifting mechanism 20 so as to be rotatable in the front-rear direction. On the left side of the hydraulic housing 70, a feedback operation shaft 71 is projected, and a position feedback link mechanism 72 and a draft feedback link mechanism 74 are arranged. In the hydraulic housing 70, an elevating hydraulic cylinder 69 for rotating the lift arm 29 and an elevating hydraulic switching valve (not shown) for operating the elevating hydraulic cylinder are provided.

  A feedback operation shaft 71 is connected to the lift arm 29 via a position feedback link mechanism 72. When the lift arm 29 is rotated by the operation of the position control lever 63, the displacement of the lift arm 29 is fed back to the feedback operation shaft 71. In other words, the lift arm 29 is rotated by following the operation amount and operation direction of the position control lever 63, and the rotary tiller 24 is moved up and down. As a result, the rotary tiller 24 is supported at an arbitrary height by the operation of the position control lever 63.

  Further, a torsion bar 73 is disposed on the top link hitch 26. A feedback operation shaft 71 is connected to the torsion bar 73 via a draft feedback link mechanism 74. When the torsion bar 73 is distorted by a load received by the top link hitch 26 via the top link 22 in a tilling operation or the like for pulling the rotary cultivator 24, the displacement (distortion) of the torsion bar 73 is a feedback operation shaft. 71 is fed back to 71.

  That is, the rotary tiller 24 is moved up and down so that the traction load of the rotary cultivator 24 becomes a load set by the draft control lever 64 (traction load control is turned off or on, insensitive or sensitive switching). It is configured. As a result, a state in which the traction load set by the draft control lever 64 is maintained, in other words, a tilling operation and the like for towing the rotary cultivator 24 with a predetermined load set by the draft control lever 64 is performed.

  As shown in FIG. 7, a draft control shaft 78 is rotatably fitted to the position control shaft 77, and the position control shaft 77 and the draft control shaft 78 having a double shaft structure are passed through the hydraulic housing 70. A position control arm 79 is fixed to the end of a position control shaft 77 protruding into the hydraulic housing 70. A draft control arm 80 is fixed to an end of a draft control shaft 78 that protrudes into the hydraulic housing 70. The lifting hydraulic cylinder 69 is controlled through the position control arm 79 or the draft control arm 80.

  As shown in FIG. 7, one position support plate 81, one draft support plate 82, two plate support bolts 83, two position support collars 84, two draft support collars 85, a draft A retaining plate 86 for preventing the control shaft 78 from moving in the axial direction is provided. Plate support bolts 83 are passed through the position support plate 81, the draft support plate 82 and the retaining plate 86. The position support collar 84 is fitted on the plate support bolt 83 between the position support plate 81 and the draft support plate 82. The draft support collar 85 is fitted on the plate support bolt 83 between the draft support plate 82 and the retaining plate 86.

  The front end screw of the plate support bolt 83 is screwed into the hydraulic housing 70. Between the side surface of the hydraulic housing 70 and the head of the plate support bolt 83, a position support plate 81, a draft support plate 82, and a retaining plate 86 are fixed substantially in parallel. A position control shaft 77 protrudes outward of the hydraulic housing 70, and the position control shaft 77 passes through the draft support plate 82.

  Further, the base end boss body 87 of the position control lever 63 is fixed to the position control shaft 77 between the position support plate 81 and the draft support plate 82. Two sets of four disc springs for position 88 are fitted on the position control shaft 77 between the draft support plate 82 and the base end boss body 87. A position friction plate 89 is fitted on the position control shaft 77 between the position support plate 81 and the base end boss body 87.

  With reference to FIG. 7, the structure which supports the position control lever 63 in the operation position with the spring force of the position disc spring 88 is demonstrated. A single position friction bolt 90 for adjusting the operating force (braking force) of the position control lever 63 and a single position nut 91 for fixing the position friction bolt 90 are provided. A position friction bolt 90 is screwed onto the position support plate 81. By tightening the position friction bolt 90, the distal end side of the bolt 90 comes into contact with the position friction plate 89, and the position friction plate 89 is pressure-bonded to the position disc spring 88 via the base end boss body 87.

  That is, by adjusting the spring force of the position disc spring 88, the operating force of the position control lever 63 (the braking force that supports the position control lever 63 at the operating position) is adjusted. Further, the position friction bolt 90 is fixed to the position support plate 81 by the position nut 91 by screwing the position nut 91 to the position friction bolt 90.

  Also, as shown in FIG. 7, lever stoppers 63a and 63b are integrally formed at the base end of the position control lever 63, and the position control lever 63 is operated when the position control lever 63 is operated to the highest position or the lowest position. The lever stopper portions 63 a and 63 b of the lever 63 are configured to contact the position support collar 84. That is, the position control lever 63 is operated between the highest position or the lowest position set by the contact between the lever stoppers 63a and 63b for the highest position or the lowest position and the position support collar 84. A lever stopper for limiting the operating range of the position control lever 63 is also used in the position support collar 84.

  With the above configuration, in the assembly work or maintenance work of the position control lever 63, the position friction bolt 90 is loosened or tightened while the position nut 91 is loosened, and the spring force of the position disc spring 88 is To adjust the operating force of the position control lever 63 (the braking force that supports the position control lever 63 at the operating position). In a state where the position control lever 63 is supported at the operation position with an appropriate brake force, the position nut 91 is tightened, the position friction bolt 90 is fixed, and the position disc spring 88 is maintained at a predetermined spring force.

  With reference to FIG. 6, the structure which supports the draft control lever 64 in the operation position with the spring force of the draft disk spring 95 is demonstrated. As shown in FIG. 6, two draft friction plates 93 sandwiching the draft support plate 82, a base end portion of the draft control lever 64, a single draft bolt that penetrates the draft support plate 82 and the draft friction plate 93. 94, two sets of four draft disc springs 95 for adjusting the operating force of the draft control lever (braking force for supporting the position control lever 63 at the operating position), and a single draft screwed to the draft bolt 94 A friction nut 96 is provided.

  Further, a proximal end boss body 96 of the draft control lever 64 is fixed to a draft control shaft 78 between the draft support plate 82 and the retaining plate 86 (see FIG. 7). As shown in FIG. 6, a long hole 97 extending on the circumference centering on the axis of the draft control shaft 78 is formed in the draft support plate 82. A draft bolt 94 is passed through the long hole 97 so that the draft control lever 64 rotates around the draft control shaft 78.

  As shown in FIG. 6, a draft support plate 82, a draft friction plate 93, and a draft disc spring 95 are sandwiched between the base end portion of the draft control lever 64 and the draft friction nut 96. When the draft friction nut 96 is tightened, the nut 96 comes into contact with the draft disc spring 95, and the draft friction plate 93 is moved to the draft control lever 64 and the draft support plate 82 by the elastic force of the draft disc spring 95. Crimped to That is, by adjusting the spring force of the draft disc spring 95, the operating force of the draft control lever 64 (the braking force that supports the draft control lever 64 at the operating position) is adjusted.

  With the above configuration, in the assembly work or maintenance work of the draft control lever 64, the draft friction nut 96 is loosened or tightened while the position nut 91 is loosened, so that the spring force of the draft disc spring 95 is obtained. To adjust the operating force of the draft control lever 64 (the braking force that supports the draft control lever 64 at the operating position).

  A second embodiment in which the draft control lever 64 shown in the above embodiment is omitted and only the position control lever 63 is provided will be described with reference to FIGS. As shown in FIGS. 8 and 9, the position control shaft 77 penetrates the hydraulic housing 70. A position control arm 79 is fixed to the end of a position control shaft 77 protruding into the hydraulic housing 70. The lifting hydraulic cylinder 69 is controlled via the position control arm 79.

  As shown in FIG. 9, one position support plate 81, two plate support bolts 83, two position support collars 84, and a retaining plate 86 for preventing the draft control shaft 78 from moving in the axial direction. Prepare. A plate support bolt 83 is passed through the position support plate 81 and the retaining plate 86. A draft support collar 84 is fitted on a plate support bolt 83 between the position support plate 81 and the retaining plate 86.

  The front end screw of the plate support bolt 83 is screwed into the hydraulic housing 70. Between the side surface of the hydraulic housing 70 and the head of the plate support bolt 83, the position support plate 81 and the retaining plate 86 are fixed substantially in parallel. A position control shaft 77 is protruded outward of the hydraulic housing 70.

  Further, as shown in FIG. 9, the base end boss body 87 of the position control lever 63 is fixed to the position control shaft 77 between the position support plate 81 and the retaining plate 86. Two sets of four disc springs for position 88 are fitted on the position control shaft 77 between the position support plate 81 and the base end boss body 87 via a washer 98. A position friction plate 89 is fitted on the position control shaft 77 between the retaining plate 86 and the base end boss body 87.

  Further, as shown in FIG. 9, a single position friction bolt 90 for adjusting the operating force (braking force) of the position control lever 63 and a single position nut 91 for fixing the position friction bolt 90 are provided. Yes. A position friction bolt 90 is screwed onto the position support plate 81. By tightening the position friction bolt 90, the distal end side of the bolt 90 comes into contact with the position friction plate 89, and the proximal boss body 87 is pressed against the position friction plate 89 by the elastic force of the position disc spring 88. .

  That is, by adjusting the spring force of the position disc spring 88, the operating force of the position control lever 63 (the braking force that supports the position control lever 63 at the operating position) is adjusted. Further, by screwing the position nut 91 to the position friction bolt 90, the position friction bolt 90 is fixed to the position support plate 81 by the position nut 91, and the position disc spring 88 is maintained at a predetermined spring force. The

  As shown in FIGS. 1, 3, 7, and 9, a rotary cultivator 24 as an agricultural working machine is connected to a traveling machine body 2 that is supported by a front wheel 3 and a rear wheel 4 so as to freely travel. In an operating device for an agricultural machine, which is mounted so as to be able to move up and down, and includes a lifting hydraulic cylinder as a lifting actuator 69 that moves the rotary tiller 24 up and down, and a position control lever 63 that operates the lifting hydraulic cylinder 69. A single position friction bolt 90 for adjusting the operating force of the position control lever 63 and a single position nut 91 for fixing the position friction bolt 90 are provided, and the position control lever 90 is tightened to position control lever 63, adjusting the operating force, the position nut 91 It is configured so as to secure the ® down for friction bolt 90. Therefore, the number of assembly steps for the position control lever 63 and the like can be greatly reduced, and the adjustment workability of the operating force for the position control lever 63 and the like can be improved.

  As shown in FIGS. 3 and 7, the structure is provided with a draft control lever 64 for controlling the draft operation of the rotary tiller 24, and includes a draft disc spring 95 for adjusting the operating force of the draft control lever 64, and a draft control. A single draft bolt 94 that adjusts the operating force of the lever 64 and a single draft friction nut 96 are provided, and the operating force of the draft control lever 64 is adjusted by tightening the draft friction nut 96. ing. Therefore, the man-hours for assembling the draft control lever 64, the draft disc spring 95, the draft friction nut 96, etc. can be greatly reduced, and the adjustment workability of the operating force of the draft control lever 64 can be improved.

  As shown in FIGS. 3, 7, and 9, the structure is provided with a position disc spring 88 that adjusts the operating force of the position control lever 63 and a plate support bolt 83 that supports the position friction plate 89. A position support collar 84 as a plate support collar is fitted on the support bolt 83, and a lever stopper for limiting the operating range of the position control lever 63 is also used as the position support collar 84. Therefore, the number of assembly steps for the position control lever 63 and the like can be greatly reduced, and the adjustment workability of the operating force for the position control lever 63 and the like can be improved. Further, since the lever stopper is also used as the position support collar 84, the operation range of the position control lever 63 can be easily limited, the number of components can be reduced, and the manufacturing cost can be reduced.

2 traveling machine body 3 front wheel 4 rear wheel 23 link mechanism 24 rotary tiller (agricultural work machine)
63 Position control lever 64 Draft control lever 69 Elevating hydraulic cylinder (elevating actuator)
83 Plate support bolt 84 Position support collar (Plate support collar)
88 Belleville spring for position 89 Friction plate for position 90 Friction bolt for position 91 Nut for position 94 Draft bolt 95 Draft disk spring 96 Draft friction nut

Claims (3)

A farming machine is mounted on a traveling machine body supported by a front wheel and a rear wheel so as to be able to run up and down through a link mechanism, and a lifting actuator for raising and lowering the farming machine and a lifting actuator are operated. In the operating device of the agricultural machine comprising the position control lever,
A single position friction bolt for adjusting the operating force of the position control lever; and a single position nut for fixing the position friction bolt; and tightening the position friction bolt to An operating device for an agricultural machine characterized by adjusting the operating force and fixing the position friction bolt with the position nut.   A structure having a draft control lever for controlling the draft operation of the farm machine, a draft disc spring for adjusting the operating force of the draft control lever, and a single draft for adjusting the operating force of the draft control lever 2. The agricultural machine according to claim 1, further comprising: a bolt for friction and a single draft friction nut, wherein the draft friction nut is tightened to adjust an operating force of the draft control lever. Operating device. A position disc spring that adjusts the operating force of the position control lever, and a plate support bolt that supports the position friction plate, the plate support collar being fitted on the plate support bolt, and the position 2. The operation device for an agricultural machine according to claim 1, wherein a lever stopper for limiting an operation range of the control lever is also used as a plate support collar.

Images