JP2017074034A - Tilling machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tilling machine in which the shape of a rod, the arrangement of a push-pull wire, etc. are simple.SOLUTION: A tilling machine 2 comprises a rotary 21, a rotary cover 22, a rear cover 23, a hanger rack mechanism 25, and a frame pipe 28, and also comprises a first stay 261 fixed to the rear cover 23, a first rod 262 connected to the stay 261, a first arm 263 to be rotated by the first rod 262, and a push-pull wire 264 connected to the first arm 263. The frame pipe 28 is provided with a hanger stay 252 constituting the hanger rack mechanism 25, and the first arm 263 is rotatably supported by the hanger stay 252.SELECTED DRAWING: Figure 11

Description

  The present invention relates to a tillage working machine.

  Conventionally, a tractor which is a typical work vehicle is known (see Patent Document 1). The tractor can pull a tiller to cultivate the field. Further, the tractor can adjust the tilling depth (also referred to as tilling depth) by raising and lowering the tilling work machine.

  By the way, the tilling work machine includes a rear cover that rotates according to the tilling depth, and the rod is driven by the rotation of the rear cover. Then, the angular displacement of the rear cover is transmitted to the tractor via a push-pull wire or the like (see Patent Document 2). This is a simple and reliable structure capable of transmitting a physical quantity (specifically, stroke amount) according to the tilling depth. However, when the frame pipe is provided in the vicinity of the rear cover for the purpose of improving the rigidity of the tillage work machine, the shape of the rod and the arrangement of the push-pull wires have to be complicated. Therefore, there has been a demand for a tilling machine with a simple rod shape, push-pull wire arrangement, and the like. Further, in order to ensure control stability, there is a need for a tilling work machine that gradually amplifies and transmits physical quantities as the angle of the rear cover increases and gradually attenuates and transmits physical quantities as the angle of the rear cover decreases. It was.

JP 2013-169174 A JP 2014-133438 A

  The present invention provides a tilling machine with a simple rod shape, push-pull wire arrangement, and the like. Further, the present invention provides a tilling work machine that gradually amplifies and transmits a physical quantity as the angle of the rear cover increases, and gradually attenuates and transmits the physical quantity as the angle of the rear cover decreases.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

The invention according to claim 1
A rotary to cultivate the field,
A rotary cover covering the rotary,
A rear cover that rotates in a vertical direction while being attached to the rotary cover;
A hanger rack mechanism for holding the rear cover in a state of being rotated upward;
A tiller working machine comprising a frame pipe provided along the rear cover in the vicinity of the rear cover;
A stay fixed to the rear cover;
A first rod connected to the stay;
A first arm rotated by the first rod;
An angular displacement of the rear cover is transmitted to the tractor via a push-pull wire connected to the first arm;
The frame pipe is provided with a hanger stay constituting the hanger rack mechanism,
The first arm is rotatably supported by the hanger stay.

The invention according to claim 2 is the tilling machine according to claim 1,
Assuming a line segment connecting the fulcrum and power point of the first arm,
When the rear cover is rotated upward, the angle formed by the line segment and the first rod is reduced according to the rotation of the first arm,
When the rear cover is rotated downward, an angle formed by the line segment and the first rod is increased in accordance with the rotation of the first arm.

The invention according to claim 3 is the tilling machine according to claim 1,
Assuming a line segment connecting the fulcrum of the first arm and the action point,
When the rear cover is rotated upward, an angle formed by the line segment and the push-pull wire becomes smaller according to the rotation of the first arm,
When the rear cover is rotated downward, an angle formed by the line segment and the push-pull wire is increased in accordance with the rotation of the first arm.

The invention according to claim 4 is the tilling work machine according to any one of claims 1 to 3,
Comprising a first arm bracket fixed to the hanger stay;
The first arm bracket rotatably supports the first arm and holds one end of the push-pull wire.

The invention which concerns on Claim 5 is a tilling work machine as described in any one of Claims 1-4.
A second arm rotated by the push-pull wire;
A second rod connected to the second arm;
A link lever that is rotated by the second rod;
A second arm bracket and a link lever bracket are provided on a pipe case covering a drive shaft for transmitting rotational power to the rotary,
The second arm is rotatably supported by the second arm bracket and the link lever is rotatably supported by the link lever bracket.

The invention which concerns on Claim 6 is a tilling work machine as described in any one of Claims 1-4.
A link lever that is rotated by the push-pull wire;
A link lever bracket is provided on a pipe case that covers a drive shaft for transmitting rotational power to the rotary,
The link lever is rotatably supported by the link lever bracket.

The invention according to claim 7 is a method for producing a tillage working machine according to any one of claims 1 to 6,
Comprising a first arm bracket fixed to the hanger stay;
The first arm bracket;
A first arm attached to the first arm bracket;
An auto link unit is configured with the first rod attached to the first arm,
A step of assembling the auto link unit to the hanger stay.

  As effects of the present invention, the following effects can be obtained.

  According to the first aspect of the present invention, the tillage working machine includes a stay fixed to the rear cover, a first rod connected to the stay, a first arm rotated by the first rod, and a first arm. The angular displacement of the rear cover is transmitted to the tractor via the push-pull wire to be connected. A hanger stay constituting a hanger rack mechanism is provided on the frame pipe, and the first arm is rotatably supported by the hanger stay. Thereby, as for this tilling work machine, the shape of a 1st rod, arrangement | positioning of a push pull wire, etc. become simple.

  According to the second aspect of the present invention, in the case where a line segment connecting the fulcrum and the power point of the first arm is assumed, the tilling work machine has an angle formed by the line segment and the first rod when the rear cover rotates upward. Decreases as the first arm rotates. Further, when the rear cover is rotated downward, the angle formed by the line segment and the first rod is increased in accordance with the rotation of the first arm. As a result, the tilling work machine gradually amplifies and transmits the physical quantity as the angle of the rear cover increases, and gradually attenuates and transmits the physical quantity as the angle of the rear cover decreases.

  According to the third aspect of the present invention, in the case of a line segment connecting the fulcrum of the first arm and the action point, the tilling work machine is formed between the line segment and the push-pull wire when the rear cover rotates upward. The angle becomes smaller as the first arm rotates. Further, when the rear cover is rotated downward, the angle formed by the line segment and the push-pull wire is increased according to the rotation of the first arm. As a result, the tilling work machine gradually amplifies and transmits the physical quantity as the angle of the rear cover increases, and gradually attenuates and transmits the physical quantity as the angle of the rear cover decreases.

  According to invention of Claim 4, this tilling work machine is equipped with the 1st arm bracket fixed to a hanger stay. The first arm bracket rotatably supports the first arm and holds one end of the push-pull wire. Accordingly, the tillage working machine reliably transmits the physical quantity because the push-pull wire does not become tensioned or relaxed even when the first arm rotates.

  According to invention of Claim 5, this tilling work machine is the 2nd arm rotated by a push pull wire, the 2nd rod connected with a 2nd arm, and the link lever rotated by a 2nd rod, Are provided. The pipe case covering the drive shaft for transmitting rotational power to the rotary is provided with a second arm bracket and a link lever bracket, the second arm is rotatably supported by the second arm bracket, and the link lever is The link lever bracket is rotatably supported. Thereby, since this tillage working machine becomes a structure which ensured high reliability, it transmits a physical quantity reliably.

  According to invention of Claim 6, this tilling work machine is equipped with the link lever rotated by a push pull wire. A link lever bracket is provided on a pipe case covering a drive shaft for transmitting rotational power to the rotary, and the link lever is rotatably supported by the link lever bracket. Thereby, since this tillage working machine becomes a structure which ensured high reliability, it transmits a physical quantity reliably.

  According to invention of Claim 7, this tilling work machine is equipped with the 1st arm bracket fixed to a hanger stay. An auto link unit is configured by the first arm bracket, the first arm attached to the first arm bracket, and the first rod attached to the first arm, and the auto link unit is hangered. It has a process of assembling to the stay. Thereby, since this assembling machine becomes easy to assemble, the production efficiency is improved.

The figure which shows a tractor. The figure which shows the link mechanism of a tractor. The figure which shows the raising / lowering operation | movement of a tillage working machine. The figure which shows the inclination operation | movement of a tillage working machine. The figure which shows the tillage working machine which concerns on 1st embodiment. The figure seen from the arrow X of FIG. The figure seen from the arrow Y of FIG. The figure seen from the arrow Z of FIG. The figure which shows a plowing depth transmission mechanism. The figure which shows the condition where a rear cover rotates according to tilling depth. The figure which shows operation | movement of the tilling depth transmission mechanism when a rear cover rotates upwards. The figure which shows operation | movement of the tilling depth transmission mechanism when a rear cover rotates below. The figure seen from the arrow U of FIG.11 and FIG.12. The figure which shows a part detail of a tilling work machine. The figure which shows the state which the hitch member and the tilling work machine connected. The figure which shows the tillage working machine which concerns on 2nd embodiment. The figure seen from the arrow X of FIG. The figure seen from the arrow Y of FIG. The figure seen from the arrow Z of FIG. The figure which shows a plowing depth transmission mechanism. The figure which shows the condition where a rear cover rotates according to tilling depth. The figure which shows operation | movement of the tilling depth transmission mechanism when a rear cover rotates upwards. The figure which shows operation | movement of the tilling depth transmission mechanism when a rear cover rotates below. The figure seen from the arrow U of FIG.22 and FIG.23. The figure which shows a part detail of a tilling work machine. The figure which shows the state which the hitch member and the tilling work machine connected. The figure which shows the assembly process of an auto link unit. The figure which shows the attachment process of an auto link unit. The figure which shows the connection process of a push pull wire.

  First, the tractor 1 will be briefly described.

  FIG. 1 shows a tractor 1. In the figure, the front-rear direction, the left-right direction, and the up-down direction of the tractor 1 are represented.

  The tractor 1 mainly includes a frame 11, an engine 12, a transmission 13, a front axle 14, and a rear axle 15. Further, the tractor 1 includes a cabin 16.

  The frame 11 forms a skeleton at the front portion of the tractor 1. The frame 11 constitutes the chassis of the tractor 1 together with the transmission 13 and the rear axle 15. The engine 12 described below is supported by the frame 11.

  The engine 12 converts thermal energy obtained by burning fuel into kinetic energy. That is, the engine 12 generates rotational power by burning fuel. A control device is connected to the engine 12. When the operator operates the accelerator pedal, the control device changes the operating state of the engine 12 according to the operation.

  The transmission 13 transmits the rotational power of the engine 12 to the front axle 14 and the rear axle 15. Rotational power of the engine 12 is input to the transmission 13 via a clutch. The transmission 13 is provided with a continuously variable transmission. When the operator operates the shift lever, the continuously variable transmission changes the operating state of the transmission 13 according to the operation.

  The front axle 14 transmits the rotational power of the engine 12 to the front tire 141. The rotational power of the engine 12 is input to the front axle 14 via the transmission 13. The front axle 14 is provided with a steering device. When the operator operates the steering wheel, the steering device changes the steering angle of the front tire 141 according to the operation.

  The rear axle 15 transmits the rotational power of the engine 12 to the rear tire 151. The rotational power of the engine 12 is input to the rear axle 15 via the transmission 13. The rear axle 15 is provided with a PTO drive device. When the operator operates the switch, the PTO drive device inputs rotational power to a towing work machine (such as a tilling work machine 2 described later).

  Next, the link mechanism 17 will be described.

  FIG. 2 shows the link mechanism 17 of the tractor 1. Below, it demonstrates supposing the state where the tilling work machine 2 was attached to the link mechanism 17. FIG. In addition, FIG. 3 has shown the raising / lowering operation | movement of the tillage working machine 2. FIG. FIG. 4 shows an inclination operation of the tillage work machine 2. In the figure, the front-rear direction, the left-right direction, and the up-down direction of the tractor 1 are represented.

  The link mechanism 17 includes a top bracket 171 and a top link 172. The link mechanism 17 includes a lower bracket 173 and a lower link 174. Further, the link mechanism 17 includes a lift arm 175, a lift actuator 176, a lift link 177, and a tilt actuator 178.

  The top bracket 171 is attached to the rear part of the transmission 13. The top bracket 171 has a hinge portion in which two plates are arranged in parallel. The hinge part is provided with a pin hole penetrating the two plates in the horizontal direction.

  The top link 172 is attached to the hinge portion of the top bracket 171. The top link 172 is rotatably connected around the pin P1 by inserting the pin P1 in a state where the pin hole of the clevis attached to the base end portion and the pin hole of the top bracket 171 are overlapped. ing. The top link 172 is centered on the pin P2 by inserting the pin P2 with the pin hole of the clevis attached to the tip and the pin hole of the hitch member 18 (see FIG. 15) being overlapped. It is pivotally connected. The tillage working machine 2 is hooked on the hook 18F of the hitch member 18 (see FIG. 15).

  The lower bracket 173 is attached to the lower part of the transmission 13. The lower bracket 173 has a hinge portion in which two plates are arranged in parallel. The hinge part is provided with a pin hole penetrating the two plates in the horizontal direction.

  The lower link 174 is attached to the hinge portion of the lower bracket 173. The lower link 174 is rotatably connected around the pin by inserting a pin (not shown) in a state where the pin hole provided at the base end and the pin hole of the lower bracket 173 are overlapped. ing. Further, the lower link 174 is connected to the rod 18R of the hitch member 18 (see FIG. 15) so that the hook 17F provided at the tip is pivoted about the rod 18R. The tiller working machine 2 is fixed by fitting the rod 29 and the slit of the hitch member 18 (see FIG. 15).

  The lift arm 175 is attached to the side portion of the transmission 13. The lift arm 175 is rotatably supported around the shaft 13S by fitting the shaft 13S of the transmission 13 into a shaft hole provided at the base end. Further, the lift arm 175 has a clevis formed at the tip, and a universal joint (not shown) is attached to the clevis.

  The lifting actuator 176 is attached to the upper part of the transmission 13. The lift actuator 176 has a cylinder formed on the upper cover of the transmission 13 and is integrated as a part of the transmission 13. In the lifting actuator 176, a pivot pin is attached to the piston rod, and the pivot pin is in contact with a pivot arm attached to the shaft 13S.

  The lift link 177 is attached to the left lift arm 175 and the lower link 174. The lift link 177 is centered by inserting a pin (not shown) in a state where the pin hole of the clevis attached to the base end portion and the pin hole of the universal joint (not shown) are overlapped. As shown in FIG. The lift link 177 is rotatable about the pin by inserting a pin (not shown) with the pin hole of the clevis attached to the tip and the pin hole of the lower link 174 overlapped. It is connected to.

  The tilting actuator 178 is attached to the right lift arm 175 and the lower link 174. The tilting actuator 178 has a pin (not shown) inserted in a state where the pin hole of the clevis attached to the cylinder and the pin hole of the universal joint (not shown) are overlapped, so that the pin is centered. It is pivotally connected. Further, the tilting actuator 178 rotates around the pin when a pin (not shown) is inserted in a state where the pin hole of the clevis attached to the piston rod and the pin hole of the lower link 174 are overlapped. It is connected freely.

  With such a structure, when the piston rod of the lifting actuator 176 is slid and pushed out (when the lifting actuator 176 extends), the lift arm 175 rotates upward. Then, since the lift arm 175 pulls up the left and right lower links 174 via the lift link 177 and the tilting actuator 178, the height of the tillage work machine 2 is increased (see arrow Ra in FIG. 3A). Therefore, if this operation is realized in a situation where the tilling work machine 2 sinks, the tilling depth is maintained in a constant state.

  On the other hand, when the piston rod of the lifting / lowering actuator 176 is slid and pulled (when the lifting / lowering actuator 176 contracts), the lift arm 175 rotates downward. Then, the lift arm 175 pushes down the left and right lower links 174 via the lift link 177 and the tilting actuator 178, so that the height of the tilling work machine 2 is lowered (see arrow Rb in FIG. 3B). Therefore, if this operation is realized in a situation where the tilling work machine 2 is lifted, the tilling depth is maintained in a constant state.

  In addition, when the piston rod of the tilting actuator 178 is slid and pushed out (when the tilting actuator 178 extends), only the right lower link 174 to which the tilting actuator 178 is attached rotates downward. Become. Then, while the lower link 174 on the left side is maintained as it is, the lower link 174 on the right side is pushed down, so that the tilling work machine 2 is tilted downward (see the arrow Rc in FIG. 4A). Therefore, if this operation is realized in a state where the tractor 1 is tilted to the left side, the tilling work machine 2 is maintained in a horizontal state.

  Conversely, when the piston rod of the tilting actuator 178 is slid and pulled (when the tilting actuator 178 contracts), only the right lower link 174 to which the tilting actuator 178 is attached rotates upward. Become. Then, while the lower link 174 on the left side is maintained as it is, the lower link 174 on the right side is pulled up, so that the tilling work machine 2 is tilted upward (see arrow Rd in FIG. 4B). Therefore, if this operation is realized in a state where the tractor 1 is tilted to the right side, the tilling work machine 2 is maintained in a horizontal state.

  Next, the tillage work machine 2 according to the first embodiment will be described.

  FIG. 5 shows the tillage work machine 2. 6 is a view seen from an arrow X in FIG. 5, and FIG. 7 is a view seen from an arrow Y in FIG. FIG. 8 is a view seen from an arrow Z in FIG. In the figure, the front-rear direction, the left-right direction, and the up-down direction of the tractor 1 are represented.

  The tillage work machine 2 includes a rotary 21, a rotary cover 22, a rear cover 23, and a gear unit 24.

  The rotary 21 is a structure in which a plurality of tines 21t are attached around the rotation axis. The rotary 21 is supported in parallel with the left-right direction and cultivates the field by rotating.

  The rotary cover 22 is a structure having a cover plate 22p formed in an arc shape. The rotary cover 22 is disposed along the rotary 21 and covers the top of the rotary 21. The rotary cover 22 is provided with a plurality of wirings 22r on a plate 22p.

  The rear cover 23 is a structure formed in an arc shape and having a cover plate 23p. The rear cover 23 is disposed such that the front side thereof is along the rotary 21 and covers the rear of the rotary 21. Further, the rear cover 23 is formed in an arc shape so that the rear side thereof is along the field, and the surface of the field is leveled. The rear cover 23 is rotatable about a hinge 22h (see FIG. 10) provided on the rotary cover 22 (see arrows Re and Rf in FIG. 10).

  The gear unit 24 is a structure in which a plurality of gears are accommodated in the case 24c. The gear unit 24 is supported by left and right pipe cases 27 and transmits rotational power to the rotary 21 via a drive shaft 24 s passing through the inside of the pipe cases 27. The gear unit 24 is disposed at the center in the left-right direction according to the position of the PTO drive device. Further, the pipe case 27 is arranged in parallel to the left-right direction so as to follow the upper surface of the rotary cover 22. The pipe case 27 has a role of improving the rigidity of the tillage work machine 2.

  Further, the tilling work machine 2 includes a hanger rack mechanism 25.

  The hanger rack mechanism 25 includes a hanger bracket 251, a hanger stay 252, and a hanger rod 253.

  The hanger bracket 251 is provided on the upper surface of the rear cover 23. The hanger bracket 251 has a hinge portion in which two plates are arranged in parallel. The hinge part is provided with a pin hole penetrating the two plates in the horizontal direction.

  The hanger stay 252 is provided from the frame pipe 28 toward the rear upper side. The hanger stay 252 has a guide piece in which two plates are arranged in parallel. The guide piece is provided with a rod hole that penetrates the two plates in a substantially vertical direction. Further, the hanger stay 252 is provided with a lock mechanism 252M that allows the pin to slide freely. The frame pipe 28 is disposed in parallel to the left-right direction so as to follow the upper surface of the rotary cover 22 behind the pipe case 27. In other words, the frame pipe 28 is disposed along the rear cover 23 in the vicinity of the rear cover 23. The pipe case 27 also has a role of improving the rigidity of the tillage work machine 2.

  The hanger rod 253 is attached to the hanger bracket 251 and the hanger stay 252. The hanger rod 253 is rotatable about the pin by inserting a pin (not shown) in a state where the pin hole of the clevis attached to the base end portion and the pin hole of the hanger bracket 251 are overlapped. It is connected to. Further, the hanger rod 253 is supported so as to be slidable along the central axis of the rod hole by inserting the tip portion of the hanger rod 253 into the rod hole of the guide piece constituting the hanger stay 252. Further, the hanger rod 253 is provided with a pin hole penetrating the central axis vertically.

  With such a structure, the hanger rack mechanism 25 can hold the rear cover 23 in a state of being rotated upward by inserting the pin of the lock mechanism 252M into the pin hole of the hanger rod 253.

  Further, the tilling work machine 2 includes a tilling depth transmission mechanism 26.

  FIG. 9 shows the tilling depth transmission mechanism 26. In the figure, the front-rear direction, the left-right direction, and the up-down direction of the tractor 1 are represented.

  The plowing depth transmission mechanism 26 includes a stay 261, a first rod 262, a first arm 263, a push-pull wire 264, a second arm 265, a second rod 266, and a link lever 267. Yes.

  The stay 261 is fixed to the rear cover 23. A rod hole is formed at one end of the stay 261. Then, a latching portion in which one end of the first rod 262 is bent is inserted into the rod hole of the stay 261, and the latching portion is fastened with a snap pin. Thus, the first rod 262 is coupled to the stay 261. The stay 261 is fixed to the upper surface of the rear cover 23 on the right side of the gear unit 24. Further, the first rod 262 is arranged from the stay 261 to the first arm 263 toward the front upper side.

  The first arm 263 is rotatably supported by the first arm bracket 263B (see FIG. 14A). The first arm bracket 263B is fixed along the upper surface of the hanger stay 252 (see FIG. 14A). A rod hole is formed at one end of the first arm 263. And the latching part which bent the other end of the 1st rod 262 is inserted in the rod hole of the 1st arm 263, and this latching part is fastened with the snap pin. Therefore, the first arm 263 is rotated by the first rod 262. A pin hole is formed at the other end of the first arm 263. A pin is inserted into the pin hole of the first arm 263 together with the pin hole of the wire end crimped to one end of the push-pull wire 264, and the pin is fastened with a snap pin. Thus, the push-pull wire 264 is connected to the first arm 263. The first arm 263 is disposed on the right side of the gear unit 24 and on the right side of the hanger stay 252. Further, the push-pull wire 264 is arranged so as to go around the front side of the gear unit 24 from the first arm 263 to the second arm 265. At this time, the push-pull wire 264 is held in a state where one end thereof is sandwiched between the notches 263Bf of the first arm bracket 263B (see FIGS. 27 and 29). Further, the push-pull wire 264 is fixed by the wire ring 22 r so as to be along the upper surface of the rotary cover 22. The push-pull wire 264 passes below the left and right pipe cases 27.

  The second arm 265 is rotatably supported by the second arm bracket 265B (see FIG. 14B). The second arm bracket 265B is fixed so as to fit between the pipe case 27 and the rotary cover 22 (see FIG. 14B). A pin hole is formed at one end of the second arm 265. A pin is inserted into the pin hole of the second arm 265 together with the pin hole of the wire end crimped to the other end of the push-pull wire 264, and the pin is fastened with a snap pin. Therefore, the second arm 265 is rotated by the push-pull wire 264. A rod hole is formed at the other end of the second arm 265. A latching portion obtained by bending one end of the second rod 266 is inserted into the rod hole of the second arm 265, and the latching portion is fastened with a snap pin. Thus, the second rod 266 is coupled to the second arm 265. The second arm 265 is disposed on the left side of the gear unit 24 and on the rear side of the pipe case 27. Further, the second rod 266 is disposed from the second arm 265 to the link lever 267 toward the front. At this time, the second rod 266 passes over the left pipe case 27.

  The link lever 267 is rotatably supported by a link lever bracket 267B (see FIG. 14B). The link lever bracket 267B is fixed perpendicular to the pipe case 27 (see FIG. 14B). A rod hole is formed at one end of the link lever 267. A hooking portion obtained by bending the other end of the second rod 266 is inserted into the rod hole of the link lever 267, and the hooking portion is fastened with a snap pin. Therefore, the link lever 267 is rotated by the second rod 266. A contact portion 267T is formed at the other end of the link lever 267. The contact portion 181T of the auto lever 181 is aligned with the contact portion 267T of the link lever 267 (see FIG. 15). The link lever 267 is disposed on the left side of the gear unit 24 and on the front side of the pipe case 27.

  Next, the operation mode of the tillage work machine 2 will be described.

  FIG. 10 shows a situation in which the rear cover 23 rotates according to the tilling depth D. FIG. 11 shows the operation of the tilling depth transmission mechanism 26 when the rear cover 23 is rotated upward, and FIG. 12 shows the operation of the tilling depth transmission mechanism 26 when the rear cover 23 is rotated downward. Yes. FIG. 13 is a view as seen from the arrow U in FIGS. 11 and 12. In the figure, the front-rear direction, the left-right direction, and the up-down direction of the tractor 1 are represented.

  As shown in FIG. 10A, when the field is soft, the rotary 21 sinks deeply into the field. At this time, the rear cover 23 rotates upward because the surface of the field is relatively raised (see arrow Re). Then, as shown in FIG. 11, the stay 261 pushes up the first rod 262, and the first rod 262 rotates the first arm 263 to one side. Then, the first arm 263 pulls the push-pull wire 264 (see arrow M in FIG. 13). Further, the push-pull wire 264 rotates the second arm 265 to one side, and the second arm 265 pulls the second rod 266 backward. And the 2nd rod 266 rotates the link lever 267 to one side. Thus, when the rear cover 23 rotates upward, the tillage work machine 2 pulls the push-pull wire 264 and rotates the link lever 267 to one side. Such an operation is transmitted to the tractor 1 via the auto lever 181 and the auto wire 182 (see FIG. 15). That is, a physical quantity (stroke amount) corresponding to the tilling depth D is transmitted to the tractor 1.

  As shown in FIG. 10B, when the field is hard, the rotary 21 floats shallowly on the field. At this time, the rear cover 23 rotates downward because the surface of the field is relatively lowered (see arrow Rf). Then, as shown in FIG. 12, the stay 261 pulls down the first rod 262, and the first rod 262 rotates the first arm 263 to the other. Then, the first arm 263 pushes the push-pull wire 264 (see arrow N in FIG. 13). Further, the push-pull wire 264 rotates the second arm 265 to the other, and the second arm 265 pushes the second rod 266 forward. Then, the second rod 266 rotates the link lever 267 to the other side. As described above, when the rear cover 23 rotates downward, the tillage work machine 2 pushes the push-pull wire 264 and rotates the link lever 267 to the other side. Such an operation is transmitted to the tractor 1 via the auto lever 181 and the auto wire 182 (see FIG. 15). That is, a physical quantity (stroke amount) corresponding to the tilling depth D is transmitted to the tractor 1.

  Here, a line segment Le connecting the fulcrum Pf of the first arm 263 and the force point Pe of the first arm 263 is assumed. The angle α formed by the line segment Le and the first rod 262 is always an obtuse angle (an angle that is always greater than 90 ° and less than 180 °).

When the rear cover 23 is rotated upward, the angle α formed by the line segment Le and the first rod 262 is reduced according to the rotation of the first arm 263. More specifically, the angle formed by the line segment Le and the first rod 262 decreases from the angle α to the angle α1. On the other hand, when the rear cover 23 rotates downward, the angle α formed by the line segment Le and the first rod 262 increases in accordance with the rotation of the first arm 263. More specifically, the angle formed by the line segment Le and the first rod 262 increases from the angle α to the angle α2. In addition, the following relational expressions hold for the angles α, α1, and α2.
Relational expression: 90 ° <α1 <α <α2 <180 °

  In addition, a line segment La connecting the fulcrum Pf of the first arm 263 and the action point Pa of the first arm 263 is assumed. The angle β formed by the line segment La and the push-pull wire 264 is always an obtuse angle (an angle that is always larger than 90 ° and smaller than 180 °).

When the rear cover 23 is rotated upward, the angle β formed by the line segment La and the push-pull wire 264 is reduced according to the rotation of the first arm 263. More specifically, the angle formed by the line segment La and the push-pull wire 264 decreases from the angle β to the angle β1. On the other hand, when the rear cover 23 rotates downward, the angle β formed by the line segment La and the push-pull wire 264 increases in accordance with the rotation of the first arm 263. More specifically, the angle formed by the line segment La and the push-pull wire 264 increases from the angle β to the angle β2. In addition, the following relational expressions hold for the angles β, β1, and β2.
Relational expression: 90 ° <β1 <β <β2 <180 °

  Below, the characteristic and effect of this tillage working machine 2 are demonstrated.

  As a first feature, the tilling work machine 2 is arranged such that the first arm 263 and the second arm 265 sandwich the gear unit 24 and the push-pull wire 264 is arranged around the gear unit 24. More specifically, the first tiller working machine 2 has the first arm 263 disposed on the right side of the gear unit 24 and the second arm 265 disposed on the left side of the gear unit 24. The push-pull wire 264 is disposed so as to go around the front side of the gear unit 24 from the first arm 263 to the second arm 265.

  Thereby, in this tilling work machine 2, since the push-pull wire 264 is bent in a wide region and resistance to push-pull is hardly generated, backlash (invalid stroke) of the push-pull wire 264 is reduced.

  Further, as a second feature, in the tillage working machine 2, the push-pull wire 264 is fixed along the rotary cover 22. If demonstrating it concretely, this tilling work machine 2 is fixed by the wire ring 22r so that the push pull wire 264 may follow the cover plate 22p.

  As a result, the tillage work machine 2 is sufficiently fixed to the push-pull wire 264 and does not move even by pushing and pulling (the track does not shift), so that the backlash (invalid stroke) of the push-pull wire 264 is reduced.

  Further, as a third feature, the main tilling work machine 2 has the second arm 265 disposed on the rear side of the pipe case 27, the push-pull wire 264 disposed below the pipe case 27, and the second rod 266 disposed on the pipe. Arranged above the case 27. If demonstrating it concretely, as for this tilling work machine 2, the 2nd arm 265 is arrange | positioned in the vicinity of the rear side of the pipe case 27. FIG. The push-pull wire 264 passes through the pipe case 27 and is connected to the second arm 265, and the second rod 266 passes through the pipe case 27 and is connected to the second arm 265.

  Thereby, since the second arm 265, the push-pull wire 264, and the second rod 266 are arranged in a narrow region, the main tilling work machine 2 is improved in maintainability. Further, since the second arm 265, the push-pull wire 264, and the second rod 266 are geometrically arranged, the aesthetics are improved.

  Below, the other characteristic of this tillage working machine 2 and its effect are demonstrated.

  As a first feature, the tillage working machine includes a stay 261 fixed to the rear cover 23, a first rod 262 connected to the stay 261, a first arm 263 rotated by the first rod 262, and a first arm. The angular displacement of the rear cover 23 is transmitted to the tractor 1 through a push-pull wire 264 connected to the H.263. The frame pipe 28 is provided with a hanger stay 252 constituting the hanger rack mechanism 25, and the first arm 263 is rotatably supported by the hanger stay 252. More specifically, the main tilling work machine 2 is provided with the hanger stay 252 from the frame pipe 28 toward the rear upper side. Then, the first arm 263 is rotatably supported in the middle part of the hanger stay 252 separated from the frame pipe 28.

  Thereby, as for this tilling work machine 2, the 1st rod 262 is formed in the shape of a straight line, and push pull wire 264 is arranged without curving at a big angle. Therefore, the shape of the first rod 262, the arrangement of the push-pull wire 264, and the like are simplified.

  Further, as a second feature, when the tiller working machine 2 assumes a line segment Le connecting the fulcrum Pf of the first arm 263 and the force point Pe, when the rear cover 23 is rotated upward, the line segment Le and the first segment machine 1 The angle α formed by the rod 262 decreases as the first arm 263 rotates. When the rear cover 23 rotates downward, the angle α formed by the line segment Le and the first rod 262 increases in accordance with the rotation of the first arm 263. More specifically, in this tillage work machine 2, when the rear cover 23 rotates upward, the first rod 262 approaches 90 ° with respect to the line segment Le connecting the fulcrum Pf of the first arm 263 and the force point Pe. That is, the amount of angular displacement of the first arm 263 gradually increases. Further, in this tilling work machine 2, when the rear cover 23 rotates downward, the first rod 262 approaches 180 ° with respect to the line segment Le connecting the fulcrum Pf of the first arm 263 and the force point Pe. That is, the amount of angular displacement of the first arm 263 is gradually reduced.

  As a result, the tilling work machine 2 gradually amplifies and transmits the physical quantity as the angle of the rear cover 23 increases, and gradually attenuates and transmits the physical quantity as the angle of the rear cover 23 decreases.

  Further, as a third feature, when the tiller working machine 2 assumes a line segment La connecting the fulcrum Pf of the first arm 263 and the action point Pa, when the rear cover 23 rotates upward, the line tiller La and push The angle β formed by the pull wire 264 decreases as the first arm 263 rotates. Further, when the rear cover 23 rotates downward, the angle formed by the line segment La and the push-pull wire 263 increases in accordance with the rotation of the first arm 263. More specifically, in this tillage work machine 2, when the rear cover 23 rotates upward, the push-pull wire 264 approaches 90 ° with respect to the line segment La connecting the fulcrum Pf of the first arm 263 and the action point Pa. . That is, the amount of displacement of the push-pull wire 264 gradually increases. Further, in this tilling work machine 2, when the rear cover 23 rotates downward, the push-pull wire 264 approaches the line segment La connecting the fulcrum Pf of the first arm 263 and the action point Pa. That is, the amount of displacement of the push-pull wire 264 gradually decreases.

  As a result, the tilling work machine 2 gradually amplifies and transmits the physical quantity as the angle of the rear cover 23 increases, and gradually attenuates and transmits the physical quantity as the angle of the rear cover 23 decreases.

  Furthermore, as a fourth feature, the tillage working machine 2 includes a first arm bracket 263 </ b> B fixed to the hanger stay 252. The first arm bracket 263B supports the first arm 263 so as to be rotatable and holds one end of the push-pull wire 264.

  Accordingly, the tillage working machine 2 reliably transmits the physical quantity because the push-pull wire 264 does not become tensioned or relaxed even if the first arm 263 rotates.

  In addition, as a fifth feature, the tillage working machine 2 is rotated by the second arm 265 rotated by the push-pull wire 264, the second rod 266 connected to the second arm 265, and the second rod 266. Link lever 267. A second arm bracket 265B and a link lever bracket 267B are provided on the pipe case 27 that covers the drive shaft 24s for transmitting rotational power to the rotary 21, and the second arm 265 is rotatable by the second arm bracket 265B. The link lever 267 is supported rotatably by the link lever bracket 267B.

  Thereby, since this tillage working machine 2 becomes a structure which ensured high reliability, it transmits a physical quantity reliably.

  Next, the tillage working machine 3 according to the second embodiment will be described.

  FIG. 16 shows the tillage work machine 3. 17 is a view as seen from the arrow X in FIG. 16, and FIG. 18 is a view as seen from the arrow Y in FIG. FIG. 19 is a view seen from the arrow Z in FIG. In the figure, the front-rear direction, the left-right direction, and the up-down direction of the tractor 1 are represented.

  The tillage working machine 3 includes a rotary 31, a rotary cover 32, a rear cover 33, and a gear unit 34.

  The rotary 31 is a structure in which a plurality of tines 31t are attached around the rotation axis. The rotary 31 is supported in parallel with the left-right direction and cultivates the field by rotating.

  The rotary cover 32 is a structure having a cover plate 32p formed in an arc shape. The rotary cover 32 is disposed along the rotary 31 and covers the top of the rotary 31. The rotary cover 32 is provided with a plurality of wirings 32r on a plate 32p.

  The rear cover 33 is a structure formed in an arc shape and having a cover plate 33p. The rear cover 33 is disposed such that the front side thereof is along the rotary 31 and covers the rear of the rotary 31. Further, the rear cover 33 is formed in an arc shape so that the rear side thereof is along the field, and the surface of the field is leveled. The rear cover 33 is rotatable about a hinge 32h (see FIG. 21) provided on the rotary cover 32 (see arrows Re and Rf in FIG. 21).

  The gear unit 34 is a structure in which a plurality of gears are accommodated in the case 34c. The gear unit 34 is supported by left and right pipe cases 37 and transmits rotational power to the rotary 31 via a drive shaft 34 s passing through the inside of the pipe cases 37. The gear unit 34 is disposed at the center in the left-right direction according to the position of the PTO drive device. Further, the pipe case 37 is arranged in parallel to the left-right direction so as to follow the upper surface of the rotary cover 32. The pipe case 37 has a role of improving the rigidity of the tillage work machine 3.

  Further, the tilling work machine 3 includes a hanger rack mechanism 35.

  The hanger rack mechanism 35 includes a hanger bracket 351, a hanger stay 352, and a hanger rod 353.

  The hanger bracket 351 is provided on the upper surface of the rear cover 33. The hanger bracket 351 has a hinge portion in which two plates are arranged in parallel. The hinge part is provided with a pin hole penetrating the two plates in the horizontal direction.

  The hanger stay 352 is provided from the frame pipe 38 toward the rear upper side. The hanger stay 352 has a guide piece in which two plates are arranged in parallel. The guide piece is provided with a rod hole that penetrates the two plates in a substantially vertical direction. Further, the hanger stay 352 is provided with a lock mechanism 352M that allows the pins to slide freely. The frame pipe 38 is arranged in parallel to the left-right direction so as to follow the upper surface of the rotary cover 32 behind the pipe case 37. In other words, the frame pipe 38 is disposed along the rear cover 33 in the vicinity of the rear cover 33. The pipe case 37 also has a role of improving the rigidity of the tillage work machine 3.

  The hanger rod 353 is attached to the hanger bracket 351 and the hanger stay 352. The hanger rod 353 is rotatable around the pin when a pin (not shown) is inserted in a state where the pin hole of the clevis attached to the base end portion and the pin hole of the hanger bracket 351 are overlapped. It is connected to. Further, the hanger rod 353 is supported so as to be slidable along the central axis of the rod hole by inserting the tip portion of the hanger rod 353 into the rod hole of the guide piece constituting the hanger stay 352. Furthermore, the hanger rod 353 is provided with a pin hole penetrating the central axis vertically.

  With such a structure, the hanger rack mechanism 35 can hold the rear cover 33 in a state of being rotated upward by inserting the pin of the lock mechanism 352M into the pin hole of the hanger rod 353.

  Further, the tilling work machine 3 includes a tilling depth transmission mechanism 36.

  FIG. 20 shows the tilling depth transmission mechanism 36. In the figure, the front-rear direction, the left-right direction, and the up-down direction of the tractor 1 are represented.

  The plowing depth transmission mechanism 36 includes a stay 361, a rod 362, an arm 363, a push-pull wire 364, and a link lever 365.

  The stay 361 is fixed to the rear cover 33. A rod hole is formed at one end of the stay 361. Then, a latching portion in which one end of the rod 362 is bent is inserted into the rod hole of the stay 361, and the latching portion is fastened with a snap pin. In this way, the rod 362 is connected to the stay 361. The stay 361 is fixed to the upper surface of the rear cover 33 on the right side of the gear unit 34. Further, the rod 362 is disposed from the stay 361 to the arm 363 toward the front upper side.

  The arm 363 is rotatably supported by an arm bracket 363B (see FIG. 25A). The arm bracket 363B is fixed along the upper surface of the hanger stay 352 (see FIG. 25A). A rod hole is formed at one end of the arm 363. And the latching part which bent the other end of the rod 362 is inserted in the rod hole of the arm 363, and this latching part is fastened with the snap pin. Therefore, the arm 363 is rotated by the rod 362. A pin hole is formed at the other end of the arm 363. A pin is inserted into the pin hole of the arm 363 together with the pin hole of the wire end crimped to one end of the push-pull wire 364, and the pin is fastened with a snap pin. Thus, the push-pull wire 364 is connected to the arm 363. The arm 363 is disposed on the right side of the gear unit 34 and on the right side of the hanger stay 352. The push-pull wire 364 is disposed so as to go around the rear side of the gear unit 34 from the arm 363 to the link lever 365. At this time, the push-pull wire 364 is held in a state where one end thereof is sandwiched between the notches of the arm bracket 363B. Further, the push-pull wire 364 is fixed by the wire ring 32r along the upper surface of the rotary cover 32. The push-pull wire 364 passes above the left and right pipe cases 37.

  The link lever 365 is rotatably supported by a link lever bracket 365B (see FIG. 25B). The link lever bracket 365B is fixed perpendicularly to the pipe case 37 (see FIG. 25B). A pin hole is formed at one end of the link lever 365. A pin is inserted into the pin hole of the link lever 365 together with the pin hole of the wire end crimped to the other end of the push-pull wire 364, and the pin is fastened with a snap pin. Therefore, the link lever 365 is rotated by the push-pull wire 364. A contact portion 365T is formed at the other end of the link lever 365. The contact portion 181T of the auto lever 181 is aligned with the contact portion 365T of the link lever 365 (see FIG. 26). The link lever 365 is disposed on the left side of the gear unit 34 and on the front side of the pipe case 37.

  Next, the operation | movement aspect of this tilling work machine 3 is demonstrated.

  FIG. 21 shows a situation in which the rear cover 33 rotates according to the tilling depth D. FIG. 22 shows the operation of the tilling depth transmission mechanism 36 when the rear cover 33 is rotated upward, and FIG. 23 shows the operation of the tilling depth transmission mechanism 36 when the rear cover 33 is rotated downward. Yes. FIG. 24 is a diagram viewed from the arrow U in FIGS. 22 and 23. In the figure, the front-rear direction, the left-right direction, and the up-down direction of the tractor 1 are represented.

  As shown in FIG. 21A, when the farm field is soft, the rotary 31 sinks deeply into the farm field. At this time, the rear cover 33 rotates upward because the surface of the farm field is relatively raised (see arrow Re). Then, as shown in FIG. 22, the stay 361 pushes up the rod 362, and the rod 362 rotates the arm 363 to one side. Then, the arm 363 pulls the push-pull wire 364 (see arrow M in FIG. 24). Thus, the push-pull wire 364 rotates the link lever 365 to one side. Thus, when the rear cover 33 rotates upward, the tillage work machine 3 pulls the push-pull wire 364 and rotates the link lever 367 to one side. Such an operation is transmitted to the tractor 1 via the auto lever 181 and the auto wire 182 (see FIG. 26). That is, a physical quantity (stroke amount) corresponding to the tilling depth D is transmitted to the tractor 1.

  As shown in FIG. 21B, when the field is hard, the rotary 31 floats shallowly on the field. At this time, the rear cover 33 rotates downward because the surface of the field is relatively lowered (see arrow Rf). Then, as shown in FIG. 23, the stay 361 pulls down the rod 362, and the rod 362 rotates the arm 363 to the other. Then, the arm 363 pushes the push-pull wire 364 (see arrow N in FIG. 24). Thus, the push-pull wire 364 rotates the link lever 365 to the other side. In this way, when the rear cover 33 rotates downward, the tillage working machine 3 pushes the push-pull wire 364 and rotates the link lever 367 to the other side. Such an operation is transmitted to the tractor 1 via the auto lever 181 and the auto wire 182 (see FIG. 26). That is, a physical quantity (stroke amount) corresponding to the tilling depth D is transmitted to the tractor 1.

  Here, a line segment Le connecting the fulcrum Pf of the arm 363 and the force point Pe of the arm 363 is assumed. The angle α formed by the line segment Le and the rod 362 is always an obtuse angle (an angle that is always larger than 90 ° and smaller than 180 °).

When the rear cover 33 is rotated upward, the angle α formed by the line segment Le and the rod 362 is reduced according to the rotation of the arm 363. More specifically, the angle formed by the line segment Le and the rod 362 decreases from the angle α to the angle α1. On the contrary, when the rear cover 33 is rotated downward, the angle α formed by the line segment Le and the rod 362 is increased in accordance with the rotation of the arm 363. More specifically, the angle formed by the line segment Le and the rod 362 increases from the angle α to the angle α2. In addition, the following relational expressions hold for the angles α, α1, and α2.
Relational expression: 90 ° <α1 <α <α2 <180 °

  In addition, a line segment La connecting the fulcrum Pf of the arm 363 and the action point Pa of the arm 363 is assumed. The angle β formed by the line segment La and the push-pull wire 364 is always an obtuse angle (an angle that is always larger than 90 ° and smaller than 180 °).

When the rear cover 33 is rotated upward, the angle β formed by the line segment La and the push-pull wire 364 is reduced according to the rotation of the first arm 363. More specifically, the angle formed by the line segment La and the push-pull wire 364 decreases from the angle β to the angle β1. On the other hand, when the rear cover 33 rotates downward, the angle β formed by the line segment La and the push-pull wire 364 increases in accordance with the rotation of the first arm 363. More specifically, the angle formed by the line segment La and the push-pull wire 364 increases from the angle β to the angle β2. In addition, the following relational expressions hold for the angles β, β1, and β2.
Relational expression: 90 ° <β1 <β <β2 <180 °

  Below, the characteristic and effect of this tillage working machine 3 are demonstrated.

  As a first feature, the tilling work machine 3 is arranged such that the arm 363 and the link lever 365 sandwich the gear unit 34, and the push-pull wire 364 is arranged so as to go around the gear unit 34. More specifically, in the tillage working machine 3, the arm 363 is disposed on the right side of the gear unit 34, and the link lever 365 is disposed on the left side of the gear unit 34. The push-pull wire 364 is disposed so as to go around the rear side of the gear unit 34 from the arm 363 to the link lever 365.

  Thereby, in this tilling work machine 3, since the push-pull wire 364 is bent in a wide region and resistance to push-pull is hardly generated, backlash (invalid stroke) of the push-pull wire 364 is reduced.

  In addition, as a second feature, in the tillage working machine 3, the push-pull wire 364 is fixed along the rotary cover 32. If demonstrating it concretely, as for this tilling work machine 3, the push pull wire 364 is fixed by the wire ring 32r so that the cover plate 32p may be followed.

  As a result, the tillage work machine 3 is sufficiently fixed to the push-pull wire 364 and does not move even by pushing and pulling (the track does not shift), so the backlash (invalid stroke) of the push-pull wire 364 is reduced.

  Further, as a third feature, in the tillage working machine 3, the link lever 365 is disposed on the front side of the pipe case 37, and the push-pull wire 364 is disposed above the pipe case 37. If it demonstrates concretely, as for this tilling work machine 3, the link lever 365 is arrange | positioned in the vicinity of the front side of the pipe case 37. FIG. The push-pull wire 364 passes through the pipe case 37 and is connected to the link lever 365.

  Thereby, since the link lever 365 and the push-pull wire 364 are simply connected, the maintainability of the tillage working machine 3 is improved.

  Below, the other characteristics and effect of this tilling work machine 3 are demonstrated.

  As a first feature, the tillage working machine 3 includes a stay 361 fixed to the rear cover 33, a rod 362 connected to the stay 361, an arm 363 rotated by the rod 362, and a push-pull wire connected to the arm 363. 364, and the angular displacement of the rear cover 33 is transmitted to the tractor 1. The frame pipe 38 is provided with a hanger stay 352 constituting the hanger rack mechanism 35, and the arm 363 is rotatably supported by the hanger stay 352. More specifically, the tillage working machine 3 is provided with a hanger stay 352 facing the rear upper side from the frame pipe 38. Then, the arm 363 is rotatably supported by the middle part of the hanger stay 352 that is separated from the frame pipe 38.

  Thereby, in this tilling work machine 3, the rod 362 is formed in a substantially linear shape, and the push-pull wire 364 is arranged without being bent at a large angle. Accordingly, the shape of the rod 362, the arrangement of the push-pull wire 364, and the like are simplified.

  Further, as a second feature, when the tiller working machine 3 assumes a line segment Le connecting the fulcrum Pf of the first arm 363 and the force point Pe, when the rear cover 33 is rotated upward, the line segment Le and the first segment machine 1 The angle α formed by the rod 362 decreases as the first arm 363 rotates. Further, when the rear cover 33 is rotated downward, the angle α formed by the line segment Le and the first rod 362 increases in accordance with the rotation of the first arm 363. More specifically, in this tillage work machine 3, when the rear cover 33 rotates upward, the first rod 362 approaches 90 ° with respect to the line segment Le connecting the fulcrum Pf of the first arm 363 and the force point Pe. That is, the amount of angular displacement of the first arm 363 gradually increases. Further, in this tilling work machine 3, when the rear cover 33 rotates downward, the first rod 362 approaches 180 ° with respect to the line segment Le connecting the fulcrum Pf of the first arm 363 and the force point Pe. That is, the amount of angular displacement of the first arm 363 gradually decreases.

  Thus, the tilling work machine 3 gradually amplifies and transmits the physical quantity as the angle of the rear cover 33 increases, and gradually attenuates and transmits the physical quantity as the angle of the rear cover 33 decreases.

  Furthermore, as a third feature, when the line tiller connecting the fulcrum Pf of the first arm 363 and the action point Pa is assumed, the main tilling work machine 3 pushes the line segment La and pushes when the rear cover 33 rotates upward. The angle β formed by the pull wire 364 decreases with the rotation of the first arm 363. Further, when the rear cover 33 is rotated downward, an angle formed by the line segment La and the push-pull wire 363 is increased according to the rotation of the first arm 363. More specifically, in this tillage work machine 3, when the rear cover 33 rotates upward, the push-pull wire 364 approaches 90 ° with respect to the line segment La connecting the fulcrum Pf of the first arm 363 and the action point Pa. . That is, the moving displacement amount of the push-pull wire 364 gradually increases. Further, in this tilling work machine 3, when the rear cover 33 rotates downward, the push-pull wire 364 approaches the line segment La connecting the fulcrum Pf of the first arm 363 and the action point Pa. That is, the amount of displacement of the push-pull wire 364 gradually decreases.

  Thus, the tilling work machine 3 gradually amplifies and transmits the physical quantity as the angle of the rear cover 33 increases, and gradually attenuates and transmits the physical quantity as the angle of the rear cover 33 decreases.

  Furthermore, as a fourth feature, the tillage working machine 3 includes an arm bracket 363B fixed to the hanger stay 352. The arm bracket 363B rotatably supports the arm 363 and holds one end of the push-pull wire 364.

  As a result, the tillage working machine 3 reliably transmits the physical quantity because the push-pull wire 364 is not tensioned or relaxed even when the arm 363 is rotated.

  In addition, as a fifth feature, the tillage working machine 3 includes a link lever 365 that is rotated by a push-pull wire 364. A link lever bracket 365B is provided on a pipe case 37 that covers the drive shaft 34s for transmitting rotational power to the rotary 21, and the link lever 365 is rotatably supported by the link lever bracket 365B.

  Thereby, since this tillage working machine 3 becomes a structure which ensured high reliability, it transmits a physical quantity reliably.

  Next, the feature point regarding the assembly work of the tillage working machines 2 and 3 will be described. Below, it demonstrates using the tillage working machine 3 as a representative.

  In the present tilling work machine 3, the rod 362, the arm 363, and the arm bracket 363B constitute an auto link unit 36U. Therefore, the assembling work of the tillage working machine 3 includes a process of assembling the auto link unit 36U (see FIG. 27), a process of attaching the auto link unit 36U (see FIG. 28), and a process of connecting the push-pull wire 364 ( 29).

  The step of assembling the auto link unit 36U is a step of attaching the arm 363 to the arm bracket 363B and attaching the rod 362 to the arm 363. The arm bracket 363B has an upper surface portion 363Ba and a side surface portion 363Bb formed by bending a metal plate, and the shaft portion 363Bc is welded so as to penetrate the side surface portion 363Bb. On the other hand, the arm 363 is cut out from a metal plate to form two arm portions 363a and 363b, and a shaft boss 363c is welded so as to penetrate the base end portion thereof. Therefore, the arm 363 is attached in a state where the shaft portion 363Bc of the arm bracket 363B is inserted into the shaft boss 363c. At this time, the arm 363 is rotatably held by an E-type retaining ring (E-ring) 363R via a washer 363W. In addition, the arm 363 has a rod hole 363d formed at the tip of one arm portion 363a. On the other hand, the rod 362 has a hooking portion 362a formed by bending a metal bar. Therefore, the rod 362 is attached in a state where the latching portion 362 a is inserted through the rod hole 363 d of the arm 363. At this time, the rod 362 is rotatably held by the snap pin 362Pa.

  The process of attaching the auto link unit 36U is a process of attaching the assembled auto link unit 36U to the hanger stay 352. The arm bracket 363B has two bolt holes 363Bd and 363Bd formed in the upper surface portion 363Ba. On the other hand, the hanger stay 352 has two bolt holes 352d and 352d formed on the upper surface thereof, and a nut is welded on the inner side. Therefore, the arm bracket 363 </ b> B is attached such that the upper surface portion 363 </ b> Ba is along the upper surface of the hanger stay 352 and the side surface portion 363 </ b> Bb is along the side surface of the hanger stay 352. At this time, the arm bracket 363B is fixed by the flange bolts 363BB and 363BB. The rod 362 is formed with a latching portion 362b by bending a metal bar. Therefore, the rod 362 is attached in a state in which the hooking portion 362b is inserted through the rod hole 361a of the stay 361. At this time, the rod 362 is rotatably held by the snap pin 362Pb.

  The step of connecting the push-pull wire 364 is a step of connecting the push-pull wire 364 to the attached auto link unit 36U (the push-pull wire 264 may be used). In the arm 363, a pin 363e is press-fitted so as to penetrate the tip portion of the other arm portion 363b. On the other hand, the push-pull wire 364 has a wire end caulked at one end thereof. Therefore, the push-pull wire 364 is attached in a state where the pin 363e of the arm 363 is inserted into the pin hole 364a of the wire end. At this time, the push-pull wire 364 is fixed by the snap pin 364P. In the arm bracket 363B, the front side of the upper surface portion 363Ba is raised to form a front surface portion 363Be, and a notch 363Bf is provided at a side end of the front surface portion 363Be. Therefore, the push-pull wire 364 is held in a state where one end thereof is sandwiched between the notches 363Bf of the arm bracket 363B.

  As described above, the main tilling work machine 3 includes the arm bracket 363B fixed to the hanger stay 352. The arm link 363B, the arm 363 attached to the arm bracket 363B, and the rod 362 attached to the arm 363 constitute an auto link unit 36U, and the auto link unit 36U is used as a hanger stay 352. It has an assembly process.

  Thereby, since this tilling work machine 3 becomes easy to assemble, the production efficiency is improved. Such an effect is also the same in the tillage work machine 2.

DESCRIPTION OF SYMBOLS 1 Tractor 2 Tillage work machine 21 Rotary 22 Rotary cover 23 Rear cover 24 Gear unit 25 Hanger rack mechanism 251 Hanger bracket 252 Hanger stay 253 Hanger rod 26 Plowing depth transmission mechanism 261 Stay 262 First rod 263 First arm 264 Push pull wire 265 First Two arm 266 Second rod 267 Link lever Pa Action point Pe Force point Pf Support point La line segment Le line segment α angle β angle

Claims (7)

A rotary to cultivate the field,
A rotary cover covering the rotary,
A rear cover that rotates in a vertical direction while being attached to the rotary cover;
A hanger rack mechanism for holding the rear cover in a state of being rotated upward;
A tiller working machine comprising a frame pipe provided along the rear cover in the vicinity of the rear cover;
A stay fixed to the rear cover;
A first rod connected to the stay;
A first arm rotated by the first rod;
A push-pull wire connected to the first arm,
The frame pipe is provided with a hanger stay constituting the hanger rack mechanism,
The tiller working machine, wherein the first arm is rotatably supported by the hanger stay. Assuming a line segment connecting the fulcrum and power point of the first arm,
When the rear cover is rotated upward, the angle formed by the line segment and the first rod is reduced according to the rotation of the first arm,
2. The tillage working machine according to claim 1, wherein when the rear cover is rotated downward, an angle formed by the line segment and the first rod is increased according to the rotation of the first arm. Assuming a line segment connecting the fulcrum of the first arm and the action point,
When the rear cover is rotated upward, an angle formed by the line segment and the push-pull wire becomes smaller according to the rotation of the first arm,
2. The tillage working machine according to claim 1, wherein when the rear cover is rotated downward, an angle formed by the line segment and the push-pull wire is increased according to the rotation of the first arm. Comprising a first arm bracket fixed to the hanger stay;
The tilling work according to any one of claims 1 to 3, wherein the first arm bracket rotatably supports the first arm and holds one end of the push-pull wire. Machine. A second arm rotated by the push-pull wire;
A second rod connected to the second arm;
A link lever that is rotated by the second rod;
A second arm bracket and a link lever bracket are provided on a pipe case covering a drive shaft for transmitting rotational power to the rotary,
The second arm is rotatably supported by the second arm bracket, and the link lever is rotatably supported by the link lever bracket. The tillage work machine according to claim 1. A link lever that is rotated by the push-pull wire;
A link lever bracket is provided on a pipe case that covers a drive shaft for transmitting rotational power to the rotary,
The tilling work machine according to any one of claims 1 to 4, wherein the link lever is rotatably supported by the link lever bracket. Comprising a first arm bracket fixed to the hanger stay;
The first arm bracket;
A first arm attached to the first arm bracket;
An auto link unit is configured with the first rod attached to the first arm,
The method for producing a tillage working machine according to any one of claims 1 to 6, further comprising a step of assembling the auto link unit to the hanger stay.

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