JP2012249590A - Rotary cultivator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary cultivator, which has a simple structure with fewer structural members with a reduced manufacturing cost, and further can facilitate the height setting of a support frame.SOLUTION: A support frame 9 includes: a lateral pair of rocking arms 81; and a tool bar 83 supporting grounding members 7, 8. A scale 96 indicating a rocking height of the support frame 9 is longitudinally provided on one rocking arm 81. The front upper side of an interlocking rod 98 is supported by a machine frame 4 located above a pivotal shaft 84 so as to be vertically rockable around a lateral support shaft 99. A contact portion 101 to be laterally bent and contacted to the one rocking arm 81 from the upper side is formed on the rear lower side of the interlocking rod 98, and an index portion 101a facing the scale 96 is formed on or around the contact portion 101. The index portion 101a is longitudinally movable along the scale 96 in interlocking with the vertical rocking of the rocking arm 81.

Description

  The present invention relates to a rotary tiller that can easily set the swing height of a support frame that supports a grounding member.

  A rotary tiller mounted on a tractor via a three-point link mechanism has a support frame projecting rearwardly on the machine frame so as to be swingable up and down via a pivot shaft, and is grounded to the field at the rear of the support frame. A grounding member is provided, and a swing height adjusting mechanism capable of adjusting the swing height of the support frame between the top mast of the machine frame and the front and rear intermediate positions of the support frame is provided, and the support frame Some have a pair of left and right swing arms protruding rearward from the machine frame, and a tool bar that is connected between the rear portions of the pair of left and right swing arms and supports a grounding member.

  In this type of conventional rotary cultivator, the front mast is formed in a circular arc shape on the top mast so that the operator can easily set the swing height of the support frame. The display stand is fixed, and the scale is visible from the driver seat of the tractor with the rotary tiller lifted. There is an indicator member that moves on the scale and an interlocking mechanism that transmits the movement of the swing height adjusting mechanism to the indicator member (for example, Patent Document 1).

JP 2005-237294 A

However, conventionally, it is necessary to separately provide a display stand with a scale indicating the swinging height of the support frame on the top mast, and a relatively complicated structure that transmits the movement of the swinging height adjusting mechanism to the indicating member. The interlocking mechanism must be provided, and there are many components and the structure is complicated, resulting in high manufacturing costs.
In view of the above problems, an object of the present invention is to provide a rotary cultivator capable of reducing the number of constituent members, simplifying the structure, reducing the manufacturing cost, and facilitating the setting of the swing height of the support frame. And

In order to achieve the above-described object of the present invention, in claim 1, a support frame 9 is protruded rearward from a machine frame 4 of a rotary tiller through a pivot shaft 84 so as to be swingable up and down. Grounding members 7 and 8 for grounding to the field are provided at the rear, and the swing height adjustment that can be expanded and contracted is performed to adjust the swing height of the support frame 9 between the machine frame 4 and the front and rear intermediate positions of the support frame 9. A rotary cultivator provided with a mechanism 85,
The support frame 9 includes a pair of left and right swing arms 81 projecting rearward from the machine casing 4 and a tool bar 83 connected between the rear portions of the pair of left and right swing arms 81 to support the grounding members 7 and 8. Is provided,
One swing arm 81 is provided with a scale 96 indicating the swing height of the support frame 9 in the front-rear direction, and the front upper side of the interlocking rod 98 is supported in the left-right direction on the machine frame 4 above the pivot shaft 84. A contact portion 101 that is supported in a vertically swingable manner around the shaft 99 and that is bent in the left-right direction and is in contact with the one swing arm 81 from above is formed on the lower rear side of the interlocking rod 98. In addition, an indicator portion 101a facing the scale 96 is formed at or near the contact portion 101 itself, and the indicator portion 101a is movable back and forth along the scale 96 in conjunction with the vertical swing of the swing arm 81. This is the point.

In claim 2, the indicator portion 101a is provided below the interlocking rod 98 on the lower rear side of the contact portion 101 and is opposed to the inner surface of one swinging arm 81. The swing arm 81 is provided on the inner surface side.
In claim 3, the indicator portion 101 a is formed on the contact portion 101 itself, the contact portion 101 is slidably movable on the top of the upper surface of the swing arm 81, and the scale 96 is the swing arm 81. It is provided in the vicinity of the contact portion sliding contact portion.

According to a fourth aspect of the present invention, the interlocking rod 98 has a rear lower end bent into a substantially L shape to form a contact portion 101, and the front upper end of the interlocking rod 98 is attached to the machine frame 4 via a horizontal support shaft 99. The contact portion 101 is provided with a restricting body 103 that restricts the position of the swing arm 81 in the left-right direction.
According to a fifth aspect of the present invention, the swing height adjusting mechanism 85 includes a screw cylinder 91 that can be expanded and contracted, and an electric motor 93 that expands and contracts the screw cylinder 91.

  According to the first aspect of the present invention, since a scale indicating the swing height of the support frame may be provided on the existing swing arm of the support frame, a display table with a scale indicating the swing height of the support frame is separately provided. There is no need to provide it on the top mast. In addition, if the interlocking rod with the rear lower side bent in the left-right direction is supported by the machine frame so that it can swing up and down around the support shaft in the left-right direction, it will be linked to the movement of the swing height adjustment mechanism on the rear side of the interlocking rod. Thus, an indicator section that moves back and forth along the scale can be configured. In addition, since the rotary tiller is lifted when adjusting the swing height of the support frame, the swing height of the support frame can be easily and accurately determined by the scale of the swing arm and the position of the indicator from the driver's seat. Can be confirmed. Accordingly, the number of constituent members is small, the structure is simple, the manufacturing cost is low, and the height of the support frame can be easily set.

According to the second aspect, it is possible to separately provide an index portion that makes it easy to read the scale, and it is possible to more accurately read the swing height of the support frame.
According to the third aspect of the present invention, the indicator portion can be configured by the contact portion itself of the interlocking rod, thereby reducing the number of components, simplifying the structure, and further reducing the manufacturing cost. In this case, if the scale is provided by removing the position where the contact portion contacts the swing arm, the scale can be prevented from being worn or damaged, and the swing height of the support frame can be read accurately.

According to the fourth aspect of the present invention, the interlocking rod or the contact portion can be formed of a bar or the like, and the upper surface of one swinging arm is not largely rattled in the left-right direction in conjunction with the vertical swinging of the swinging arm. Since the side moves smoothly back and forth, the height of the support frame can be set more easily and accurately.
According to the fifth aspect, for example, the swinging height adjusting mechanism can be easily expanded and contracted only by switching on / off and forward / reverse rotation of the electric motor.

It is a side view of the rotary tiller which shows 1st Embodiment of this invention. It is a side view of the state which mounted | wore the tractor with the rotary tiller. It is a rear perspective view of the rotary tiller. It is a side view which shows 2nd Embodiment. It is a rear view which shows 3rd Embodiment. It is a rear view which shows 4th Embodiment. It is a top view which shows 5th Embodiment. It is a rear view which shows 6th Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes a rotary mounted on a rear portion of a towing vehicle such as a tractor 2 via a mounting mechanism such as a three-point link mechanism 3 so as to be movable up and down. It is a cultivator.
The rotary cultivator 1 includes a machine frame 4 attached to the tractor 2 via a three-point link mechanism 3, a cultivating unit 5 for cultivating soil, a cultivating cover 6 for covering the cultivating unit 5, a cultivator 8 and the like. And a support frame 9 to which a grounding member is attached.

The three-point link mechanism 3 includes an upper top link 11 and a pair of lower left and right lower links 12. The front link 11 and the front end sides of the left and right lower links 12 are pivotally attached to the tractor 2 side. A connecting frame 13 is attached to the rear ends of the top link 11 and the left and right lower links 12.
In this embodiment, a side drive type rotary cultivator 1 is illustrated, and the machine frame 4 extends from the gear case 14 at the center in the left-right direction to the left and right sides and to the extension end of the left support arm 15. The upper part of the transmission case 16 is attached, and the upper part of the side frame 17 is attached to the extended end of the right support arm 15 so as to be mainly configured in a gate shape.

A top mast 18 is provided on the upper part of the gear case 14 so as to protrude upward. The top mast 18 is formed in a fore-and-aft shape, and an upper engaging portion of the upper portion of the connection frame 13 is provided at the front upper part of the top mast 18. An upper connection pin 19 that engages from the lower side (or the rear end side of the top link 11 is directly pivotally connected) is provided.
Each of the left and right support arms 15 is provided with a connecting bracket 20, and the lower connecting portion of the lower portion of the connecting frame 13 is connected to the front portion of each connecting bracket 20 from the rear side (or the rear end of the lower link 12). A lower connecting pin 21 is provided, the side of which is directly pivotally connected.

The cultivating unit 5 includes a claw shaft 22 that is rotatably supported around the axis in the left-right direction between the lower part of the transmission case 16 and the side frame 17 and a plurality of cultivating claw 23 attached to the claw shaft 22. It is configured.
The power transmitted from the PTO shaft 24 of the tractor 2 to the PIC shaft 26 of the gear case 14 via the joint shaft 25 is input to the bevel gear transmission mechanism in the gear case 14 and transmitted from the bevel gear transmission mechanism to the left support arm 15. The shaft is transmitted to the claw shaft 22 through a chain transmission mechanism in the transmission case 16, and the claw shaft 22 is rotationally driven in the direction of arrow A, so that the tillage unit 5 is rotationally driven.

The tillage cover 6 includes an upper cover 27 that covers the top of the tillage unit 5 and a rear cover 28 that covers the back of the tillage. The rear cover 28 is pivotally supported on the rear end side of the upper cover 27 via a pivotal support shaft 29 so as to be pivotable about a left and right axis, and around the pivotal support shaft 29. It can be swung up and down.
In the present embodiment, the rear cover 28 has a cover main body whose upper end is pivotally supported via the rotation support shaft 29, and a leveling cover detachably attached to the lower end of the cover main body.

Further, the rear cover 28 is grounded at the lower end side and leveles the farm field plowed by the tiller 5.
A front bracket 31 is provided on each of the left and right support arms 15, and a pair of left and right rear brackets 32 are provided on the back surface of the rear cover 28 corresponding to the left and right front brackets 31. Further, the lowering devices 33L and 33R for urging the rear cover 28 downward (in the grounding direction) are provided over the rear bracket 32.

The support frame 9 includes a pair of left and right swing arms 81 that are long in the front-rear direction, an intermediate connecting member 82 that connects the left and right swing arms 81, and the left and right swing arms 81. And a tool bar 83 fixed to the rear end side.
Each of the left and right swing arms 81 is configured to be adjustable in length from a front outer cylindrical body 81a and an inner cylindrical body 81b inserted into the outer cylindrical body 81a from the rear end side. The outer cylinders 81a are connected to each other.

The front end side of the outer cylinder 81a of each swing arm 81 is pivotally connected to the rear portion of the connection bracket 20 provided on the support arm 15 of the machine frame 4 so as to be swingable up and down around a pivot shaft 84 in the left-right direction. The support frame 9 is swingable up and down via the pivot shaft 84.
On the center side in the left-right direction of the tool bar 83, a cultivator (grounding member) 8 is attached so as to be rotatable about the axis in the left-right direction and the swing height can be adjusted.

By raising and lowering the support frame 9 around the pivot shaft 84, the swing height of the earthenware vessel 8 is adjusted.
The cultivator 8 can be raised and lowered around the pivot shaft 80, and the cultivator operating device 88 can change the posture between an action posture for grounding and a retracted posture for retreating upward.
A swing height adjustment mechanism 85 that can be expanded and contracted to adjust the height of the tool bar 83 by raising and lowering the support frame 9 is provided across the top mast 18 and the intermediate connecting member 82 of the support frame 9.

The top mast 18 is constituted by connecting a pair of left and right front and rear bifurcated plates 18a opposed to each other in the left and right direction, and a pair of left and right bracket plates 86 are provided on the intermediate connecting member 82 of the support frame 9. ing.
The swing height adjustment mechanism 85 includes a screw cylinder 91 that can be expanded and contracted, and an electric motor 93 that expands and contracts the screw cylinder 91. The front side of the swing height adjusting mechanism 85 (screw cylinder 91) is pivotally supported at the rear upper end of the top mast 18 by the pivot 79 so that the electric motor 93 can be turned on / off and forward / reverse. The operation switch (not shown) is arranged at the front portion of the top mast 18 or the driver seat side of the tractor 2.

The electric motor 93 is detachably attached to the swing height adjusting mechanism 85, and is also detachably attached to the left-hand depressing device 33L and the soil culturing device 88 to raise and lower the rear cover 28 and the soil cultivator 8. It can be used for driving power.
The rotary cultivator 1 is provided with a holding member 89 for holding the electric motor 93 when the electric motor 93 is not used. The holding member 89 is attached to the top mast 18 by a fastener 90 such as a bolt.

  A scale 96 indicating the swing height of the support frame 9 is provided in the front-rear direction on the upper surface side of the outer cylinder 81 a of one (left side) swing arm 81 of the left and right swing arms 81. The scale 96 indicating the swing height of the support frame 9 is formed, for example, by sticking or marking a label indicating the scale on the upper surface side of the swing arm 81, and the scale 96 is one of the swing arms 81. Are provided on the entire top surface including the top of the top surface.

  An interlocking rod 98 is attached to the rear portion of the top mast 18 so as to protrude rearward and downward, also using the fastener 90. The interlocking rod 98 has a support bracket 97 and a bar 100 fixed to the support bracket 97, and the front upper side of the interlocking rod 98 is a shaft portion in the left-right direction of the fastener 90 above the pivot shaft 84. Around the support shaft 99, it is supported so as to be swingable up and down and protrudes rearward and downward. The support shaft 99 of the interlocking rod 98 is disposed in the vicinity of the pivot support portion 79 of the swing height adjusting mechanism 85 that is largely spaced upward from the support shaft 84, and corresponds to the expansion and contraction operation of the swing height adjusting mechanism 85. Thus, the interlock rod 98 is configured to swing up and down around the support shaft 99.

  On the lower rear side of the interlocking rod 98, there is formed a contact portion 101 in which the bar 100 is bent in an L shape outwardly in the left-right direction and is in contact with the one swing arm 81 from above. The portion 101 itself is an index portion 101 a, and the contact portion 101 to the index portion 101 a are linked to the vertical swing around the pivot shaft 84 of the swing arm 81 on the scale 96 (the top of the upper surface of the swing arm 81). The top is slidable back and forth. A pair of left and right ring-shaped restricting bodies 103 are fitted on the contact portion 101 of the interlocking rod 98 so as to sandwich one swinging arm 81 from the left and right, and the pair of restricting bodies 103 attach the one contact portion 101 to one swinging portion. The position of the moving arm 81 is restricted in the left-right direction.

  According to the above embodiment, when setting the swing height of the support frame 9, the rotary tiller 1 and the soil cultivator 8 are lifted via the three-point link mechanism 3 and the operation switch is operated from the driver seat side of the tractor 2. When the swing height adjusting mechanism 85 (screw cylinder 91) is extended by driving the electric motor 93, the support frame 9 swings downward around the pivot shaft 84 in the direction of arrow a1 in FIG. Adjusted to lower. At this time, as the support frame 9 swings in the a1 direction, the interlocking rod 98 swings in the direction of the arrow a2 around the support shaft 99, so that the contact portion 101 of the interlocking rod 98 moves forward on the scale 96. .

Further, when the swing height adjusting mechanism 85 (screw cylinder 91) is reduced, the support frame 9 is adjusted so as to rise and swing in the direction of the arrow b1 in FIG. At this time, as the support frame 9 swings in the b1 direction, the interlocking rod 98 swings in the direction of the arrow b2 around the support shaft 99, so that the contact portion 101 of the interlocking rod 98 moves backward on the scale 96. .
Therefore, while the rotary tiller 1 is lifted by the three-point link mechanism 3, the operator looks at the contact portion 101 (index portion 101 a) and the scale 96 of the interlocking rod 98 from the driver's seat side of the tractor 2 while supporting the support frame. The swing height of 9 can be set easily and reliably.

  In the case of the present embodiment, since the scale 96 indicating the swing height of the support frame 9 may be provided on the upper surface side of the existing swing arm 81 in the support frame 9, the swing height of the support frame 9 is set. There is no need to separately provide a display stand with scales on the top mast or the like. Further, if the interlocking rod 98 whose rear lower side is bent in an L shape in the left-right direction is supported on the top mast 18 so as to be swingable up and down around the support shaft 99, a swing height adjusting mechanism is provided on the rear side of the interlocking rod 98. The contact portion 101 and the indicator portion 101a that move back and forth on the scale 96 in conjunction with the movement of 85 can be configured, and the support frame 9 is located at the position of the scale 96 and the indicator portion 101 on the upper side of the swing arm 81. Can be easily and accurately known. Therefore, the number of constituent members is small, the structure is simple, the manufacturing cost is low, and the operator can easily set the swing height of the support frame 9.

If the operation switch of the electric motor 93 is disposed on the front part of the top mast 18 or on the driver seat side of the tractor 2, the support frame 9 is swung at the position of the scale 96 and the index part 101 on the upper side of the swing arm 81. The swinging height adjusting mechanism 85 can be easily expanded and contracted only by operating the switch on the driver seat side of the tractor 2 while accurately checking the moving height.
FIG. 4 shows a second embodiment. Gauge rings (grounding members) 7 are detachably attached to the left and right sides of the tool bar 83 in place of the earth ware 8 so that the swing height can be adjusted. Further, the electric motor 93 is a dedicated motor for extending and retracting the swing height adjusting mechanism 85, and the holding member 89 for holding the electric motor 93 is omitted. Then, the front upper side of the interlocking rod 98 is supported on the top mast 18 by a dedicated fastener 90 so as to be swingable up and down around the support shaft 99. The other points are the same as those in the first embodiment.

  FIG. 5 shows a third embodiment. A contact which is bent in an L shape outwardly in the left-right direction on the rear lower side of the interlocking rod 98 and is in contact with the top of the upper surface of one swing arm 81 from above. A portion 101 is formed, and a scale 96 is provided on the inner surface side of one swing arm 81. In addition, the index portion 101a is provided below the interlocking rod 98 on the lower rear side so as to protrude below the contact portion 101 and face the inner side surface of one swinging arm 81. It is formed in the vicinity of the portion 101 so as to face the scale 96. The other points are the same as those in the first embodiment.

  In the case of this embodiment, the driver seat of the tractor 2 is arranged in front of the pair of left and right swing arms 81 of the rotary tiller 1 so that the swing height of the support frame 9 is increased. If the rotary tiller 1 is lifted during adjustment, the scale 96 and the indicator portion 101a on the inner surface side of the swing arm 81 can be easily seen from the driver's seat, and the support frame 9 can be swung. The dynamic height can be confirmed easily and accurately. In addition, the index portion 101a for easily reading the scale 96 can be provided separately from the contact portion 101, and the swing height of the support frame 9 can be read more accurately. Further, since the scale 96 is provided by removing the position where the contact portion 101 contacts the swing arm 81, the scale 96 can be prevented from being worn or damaged, and the swing height of the support frame 9 can be read accurately.

FIG. 6 shows a fourth embodiment in which a scale 96 is provided at the upper part on the inner surface side of one of the swing arms 81, and the indicator portion 101a is located on the rear lower side of the interlocking rod 98 below the contact portion 101. The indicator portion 101 a is formed so as to face the scale 96 in the vicinity of the abutment portion 101.
FIG. 7 shows a fifth embodiment, in which the contact portion 101 on the lower rear side of the interlocking rod 98 is interlocked with the vertical swing around the pivot shaft 84 of the swing arm 81 on the top of the upper surface of the swing arm 81. The scale 96 is provided in the vicinity of the contact portion sliding contact portion, which is in the vicinity of the top portion excluding the top portion of the upper surface of the swing arm 81. The index part 101a is formed in the contact part 101 itself, and a part of the contact part 101 is an index part 101a.

  FIG. 8 shows a sixth embodiment, in which the contact portion 101 of the interlocking rod 98 is provided with a roller 105 that rolls on the swing arm 81, and the contact portion 101 is about the pivot shaft 84 of the swing arm 81. In conjunction with the vertical swing, the top of the top surface of the swing arm 81 can be moved back and forth via a roller 106. The scale 96 is provided in the vicinity of the top of the one swing arm 81 excluding the top. The indicator portion 101 a is formed so as to incline downward toward the inner end side in the left-right direction of the contact portion 101, and faces the scale 96.

In the embodiment, the scale 96 indicating the height of the support frame 9 is provided in the front-rear direction on the upper surface side of the left swing arm 81 of the left and right swing arms 81. A scale 96 indicating the height of the support frame 9 may be provided in the front-rear direction on the upper surface side of the right swing arm 81.
Further, the swing height adjusting mechanism 85 may be configured by a screw type telescopic structure other than the cylinder. Further, the swing height adjusting mechanism 85 may be manually expanded and contracted with an operation handle instead of the electric motor 93.

Further, the support bracket 97 of the interlock rod 98 may be fixed to the top mast 18 and the upper front end of the bar 100 may be connected to the support bracket 97 so as to be swingable up and down around the support shaft 99.
Further, a stay is erected upward from the support arm 15 or the connecting bracket 20 to pivotally support the front upper end of the interlocking rod 98 so that the interlocking rod 98 is supported on the machine frame 4 other than the top mast 18. Also good.

  In the case of the third to sixth embodiments, as in the case of the first embodiment, one or a plurality of restricting bodies 103 that restrict the position of the swinging arm 81 in the left-right direction are provided in the contact portion 101. You may make it provide.

DESCRIPTION OF SYMBOLS 1 Rotary tiller 4 Machine frame 7 Gauge wheel 8 Cultivator 9 Support frame 81 Swing arm 83 Tool bar 84 Pivot shaft 85 Swing height adjustment mechanism 91 Screw cylinder 93 Electric motor 96 Scale 98 Interlocking rod 99 Support shaft 101 Contact Part 101a Indicator part

Claims (5)

A support frame (9) protrudes rearward from the machine frame (4) of the rotary tiller via a pivot shaft (84) so as to be swingable up and down. 7, 8), and a swing height adjusting mechanism capable of extending and contracting to adjust the swing height of the support frame (9) between the machine frame (4) and the front and rear intermediate positions of the support frame (9). (85) is a rotary tiller,
The support frame (9) is connected between a pair of left and right swing arms (81) projecting rearward from the machine frame (4) and a rear portion of the pair of left and right swing arms (81) and connected to a grounding member ( 7 and 8) and a tool bar (83) for supporting,
One swing arm (81) is provided with a scale (96) indicating the swing height of the support frame (9) in the front-rear direction and interlocked with the machine frame (4) above the pivot shaft (84). The front upper side of the rod (98) is supported so as to be swingable up and down around a left and right support shaft (99), and the one lower swing arm is bent in the left and right direction on the rear lower side of the interlocking rod (98). (81) is formed with a contact portion (101) that contacts from above, and an index portion (101a) that faces the scale (96) is formed at or near the contact portion (101) itself, The rotary tiller characterized in that the indicator portion (101a) is movable back and forth along the scale (96) in conjunction with the up and down swing of the swing arm (81).   The indicator portion (101a) is provided on the rear lower side of the interlocking rod (98) so as to protrude downward from the contact portion (101) and face the inner surface of one swing arm (81). The rotary tiller according to claim 1, wherein 96) is provided on an inner surface side of one swing arm (81).   The indicator portion (101a) is formed on the contact portion (101) itself, the contact portion (101) is slidably movable on the top of the upper surface of the swing arm (81), and the scale (96) is The rotary cultivator according to claim 1, wherein the rotary cultivator is provided in the vicinity of a contact portion sliding contact portion of the swing arm (81).   The interlocking rod (98) is bent in a substantially L shape at the rear lower end to form a contact portion (101), and the front upper end of the interlocking rod (98) is attached to the machine frame (4) with a horizontal support shaft (99). ), And the contact portion (101) is provided with a regulating body (103) for regulating the position in the left-right direction with respect to the one swing arm (81). The rotary tiller according to any one of claims 1 to 3.   5. The swing height adjusting mechanism (85) includes an extendable screw cylinder (91) and an electric motor (93) for expanding and contracting the screw cylinder (91). The rotary cultivator according to any one of the above.

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