JP2020114251A - Culture implement - Google Patents

Abstract

To provide a culture implement capable of improving a leveling performance.SOLUTION: A culture implement comprises: a rotary; and a rear cover for leveling a field which is cultivated by the rotary. A middle part of a leveling plate forming the rear cover is bent for forming a soil pressing surface and a soil leveling surface on the leveling plate. A curve surface connecting the soil pressing surface and the soil leveling surface is configured so that a center position of a flexure radius is lower than an average height of soil which is pressed by the soil pressing surface and heaped up. The flexure radius is greater than 30 mm and smaller than 70 mm, the soil leveling surface has a groove part in a direction crossing an advance direction at a right angle, and a cross sectional shape of the groove part is formed into a substantially wedge shape in which a field surface is a bottom side and two slope surfaces each arranged at a sharp angle with respect to the field surface are oblique sides.SELECTED DRAWING: Figure 15

Description

The present invention relates to a tillage implement.

BACKGROUND ART Conventionally, a tractor that is a typical work vehicle has been known (see Patent Document 1). The tractor can pull various work machines. For example, it is possible to pull a tilling implement that cultivates a field by rotating a rotary.

By the way, the cultivator is provided with a rear cover so as to level the field cultivated by the rotary (see Patent Document 2). The rear cover has a grounding plate formed in an arc shape from the middle part to the rear end part, and is arranged so that a part of the grounding plate contacts the field. Therefore, the rear cover can fill the dent while pushing the soil to even out the unevenness of the field. However, the conventional tiller has a problem that it cannot be leveled even when the unevenness of the field is large. In other words, there is a problem that it is not possible to even out the level when the unevenness of the field is large, such as when the ruts of the tire are deep or when the soil excavated by the rotary is piled up high. Therefore, there has been a demand for a tillage implement with improved leveling performance.

JP, 2005-188430, A JP, 2005-181401, A

Provide a tilling implement with improved leveling performance.

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

The invention according to claim 1 is
Rotary and
In a tilling machine comprising a rear cover for leveling a field cultivated by the rotary,
A middle part of the grounding plate constituting the rear cover is bent to form an earth pressing surface and a soil leveling surface on the grounding plate,
The curved surface that connects the soil pressing surface and the soil leveling surface is such that the center position of the bending radius is lower than the average height of the soil that is pushed up by the soil pressing surface and rises.

The invention according to claim 2 is the tillage implement according to claim 1,
The bending radius is a value larger than 30 mm and smaller than 70 mm.

The invention according to claim 3 is the tillage implement according to claim 1 or claim 2,
The soil level surface is provided with a groove in a direction intersecting at right angles to the traveling direction.

The invention according to claim 4 is the tillage implement according to claim 3,
The cross-sectional shape of the groove is substantially wedge-shaped with the slope at the bottom of the field scene and the two slopes at an acute angle to the field scene.

The invention according to claim 5 is the tillage implement according to claim 3 or 4,
The rear cover is welded in a state where its rear end portion is bent back and is in contact with the slope plate that constitutes the groove.

The invention according to claim 6 is
Rotary and
In a tilling machine comprising a rear cover for leveling a field cultivated by the rotary,
A middle part of the grounding plate constituting the rear cover is bent to form an earth pressing surface and a soil leveling surface on the grounding plate,
The soil level surface is provided with a groove in a direction intersecting at right angles to the traveling direction.

The invention according to claim 7 is the tillage implement according to claim 6,
The cross-sectional shape of the groove is substantially wedge-shaped with the slope at the bottom of the field scene and the two slopes at an acute angle to the field scene.

The invention according to claim 8 is the tillage implement according to claim 6 or 7,
The rear cover is welded in a state where its rear end portion is bent back and is in contact with the slope plate that constitutes the groove.

The effects of the present invention are as follows.

According to the first aspect of the present invention, in the present tiller, the middle part of the ground leveling plate constituting the rear cover is bent to form the earth pressing surface and the soil leveling surface. The curved curved surface that connects the embossed surface and the soil level surface has a center position of the bending radius lower than the average height of the soil that is pushed up by the embossed surface. As a result, the main tillage implement can raise the soil higher to make it easier to collapse and level the collapsed soil, so that the leveling performance is improved.

According to the second aspect, the bending radius has a value larger than 30 mm and smaller than 70 mm. As a result, the main cultivator can raise the soil higher to make it easier to collapse and level the collapsed soil regardless of the characteristics of the soil, so that the leveling performance is improved.

According to the third aspect, the soil level surface is provided with the groove portion in a direction intersecting the traveling direction at a right angle. As a result, in the main cultivator, the soil rises inside the groove and the soil can be leveled again, so that the leveling performance is improved.

According to the fourth aspect, the cross-sectional shape of the groove is substantially wedge-shaped with the slope at the bottom of the farm scene and the two slopes at an acute angle to the farm scene. As a result, in the main tillage implement, the groove portion appropriately presses the soil, so that the leveling performance is improved.

According to the fifth aspect of the present invention, the rear cover is welded in a state where the rear end portion of the rear cover is bent back and is in contact with the slope plate that constitutes the groove. As a result, in the main tillage implement, the rigidity of the rear cover is improved.

According to the sixth aspect of the present invention, in the present tiller, the middle part of the ground leveling plate forming the rear cover is bent to form the earth pressing surface and the soil leveling surface. The soil level surface is provided with a groove in a direction intersecting the traveling direction at a right angle. As a result, in the main cultivator, the soil rises inside the groove and the soil can be leveled again, so that the leveling performance is improved.

According to the seventh aspect, the cross-sectional shape of the groove is substantially wedge-shaped with the slope at the bottom of the field scene and the two slopes at an acute angle with respect to the field scene. As a result, in the main tillage implement, the groove portion appropriately presses the soil, so that the leveling performance is improved.

According to the eighth aspect, the rear cover is welded in a state where the rear end portion is bent back and is in contact with the slope plate forming the groove. As a result, in the main tillage implement, the rigidity of the rear cover 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 of the tillage implement. The figure which shows the tilting operation of the tillage implement. The figure which shows the tillage implement. 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 the tilling depth transmission mechanism. The figure which shows the condition which a rear cover rotates according to the plowing depth. The figure which shows some details of the tillage implement. The figure which shows the structure in which a tillage implement is connected via a hitch member. The figure which shows the relationship between the amount of soil cultivated by the rotary and the amount of soil leveled by the rear cover. The figure which shows the shape of the soil which was pushed up by the leveling board and raised. The figure which shows a leveling board. The figure which shows the rear end part from the middle part of the ground leveling plate. The figure which shows the rear end part of the leveling board. The figure which shows the condition where the unevenness|corrugation of a field is leveled. The figure which shows arrangement|positioning of the tine in a rotary. The figure which shows arrangement|positioning of the tine in a rotary. The figure which shows arrangement|positioning of the tine in a rotary. The figure which shows arrangement|positioning of the tine in a rotary. The figure which shows arrangement|positioning of the tine in a rotary. The figure which shows arrangement|positioning of the tine in a rotary.

First, the tractor 1 will be briefly described.

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

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

The frame 11 forms a skeleton in the front part of the tractor 1. The frame 11 constitutes a 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 the thermal energy obtained by burning the fuel into kinetic energy. That is, the engine 12 produces 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 equipped 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. Rotational power of the engine 12 is input to the front axle 14 via the transmission 13. A steering device is provided in parallel with the front axle 14. 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. 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 an operator operates a switch, the PTO drive device inputs rotational power to a work machine to be towed (such as a tilling work machine 2 or 3 described later).

Next, the link mechanism 17 will be described.

FIG. 2 shows the link mechanism 17 of the tractor 1. Below, it demonstrates on the assumption that the tilling implement 2 is connected through the hitch member 18 (refer FIG. 12). In addition, FIG. 3 has shown the raising/lowering operation of the tillage implement 2. FIG. 4 shows a tilting operation of the tilling implement 2. In the figure, the front-back direction, the left-right direction, and the up-down direction of the tractor 1 are shown.

The link mechanism 17 includes a top bracket 171 and a top link 172. Further, 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 portion is provided with a pin hole that horizontally penetrates the two plates.

The top link 172 is attached to the hinge portion of the top bracket 171. The top link 172 is rotatably connected about the pin P1 by inserting the pin P1 with the pin hole of the clevis attached to the base end portion and the pin hole of the top bracket 171 overlapping each other. ing. Further, the top link 172 is rotatably connected about the pin P2 by inserting the pin P2 with the pin hole of the clevis attached to the tip end and the pin hole of the hitch member 18 being overlapped with each other. (See FIG. 12). The tiller 2 is hooked on the hook 18F of the hitch member 18 (see FIG. 12).

The lower bracket 173 is attached to the lower portion of the transmission 13. The lower bracket 173 has a hinge portion in which two plates are arranged in parallel. The hinge portion is provided with a pin hole that horizontally penetrates the two plates.

The lower link 174 is attached to the hinge portion of the lower bracket 173. The lower link 174 is rotatably connected about the pin by inserting a pin (not shown) in a state in which the pin hole provided at the base end portion and the pin hole of the lower bracket 173 are overlapped with each other. ing. Further, the lower link 174 is rotatably connected about the rod 18R by hooking the hook 17F provided at the tip end thereof to the rod 18R of the hitch member 18 (see FIG. 12). The tiller 2 is fixed by fitting the rod 29 and the slit of the hitch member 18 (see FIG. 12).

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

The lifting actuator 176 is attached to the upper portion of the transmission 13. A cylinder of the lifting actuator 176 is formed on the upper cover of the transmission 13 and is integrated as a part of the transmission 13. The lifting actuator 176 has a pivot pin attached to the piston rod, and the pivot pin is in contact with the 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 has a pin (not shown) inserted in a state in which a pin hole of a clevis attached to a base end portion and a pin hole of a universal joint (not shown) are overlapped with each other, thereby centering the pin. Is rotatably connected as. Further, 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 distal end portion and the pin hole of the lower link 174 overlapping each other. Is linked to.

The tilt actuator 178 is attached to the right lift arm 175 and the lower link 174. The tilt actuator 178 has a pin (not shown) inserted with the pin hole of the clevis attached to the cylinder and the pin hole of the universal joint (not shown) overlapped with each other. It is rotatably connected. Further, the tilting actuator 178 rotates about the pin by inserting a pin (not shown) in a state in which the pin hole of the clevis attached to the piston rod and the pin hole of the lower link 174 are overlapped with each other. It is freely connected.

With such a structure, when the piston rod of the lifting actuator 176 slides and is pushed out (when the lifting actuator 176 extends), the lift arm 175 rotates upward. Then, the lift arm 175 pulls up the left and right lower links 174 via the lift link 177 and the tilting actuator 178, so that the height of the tiller 2 becomes high (see the arrow Ra in FIG. 3A). Therefore, if such an operation is realized when the tilling implement 2 sinks, the tilling depth will be maintained in a constant state.

On the contrary, when the piston rod of the lifting actuator 176 slides and is retracted (when the lifting 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 tiller 2 becomes low (see arrow Rb in FIG. 3(B)). Therefore, if such an operation is realized when the tilling implement 2 is lifted, the tilling depth is maintained in a constant state.

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

On the contrary, when the piston rod of the tilt actuator 178 slides and is retracted (when the tilt actuator 178 contracts), only the right lower link 174 to which the tilt actuator 178 is attached rotates upward. Become. Then, the lower link 174 on the left side is maintained as it is, while the lower link 174 on the right side is pulled up, so that the tilling implement 2 tilts upward to the right (see arrow Rd in FIG. 4B). Therefore, if such an operation is realized when the tractor 1 is tilted to the right, the tilling implement 2 will be maintained in a horizontal state.

Next, the tillage implement 2 will be described.

FIG. 5 shows the tillage implement 2. 6 is a diagram viewed from the arrow X in FIG. 5, and FIG. 7 is a diagram viewed from the arrow Y in FIG. Further, FIG. 8 is a diagram viewed from the arrow Z in FIG. In the figure, the front-back direction, the left-right direction, and the up-down direction of the tractor 1 are shown.

The tillage implement 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 211 are attached around the rotation axis. In the rotary 21, the tines 211 rotate together with the rotary shaft to cultivate the field.

The rotary cover 22 is a structure having a cover plate 221 formed in an arc shape from the front end portion to the rear end portion. The rotary cover 22 is arranged so that the cover plate 221 extends along the rotary 21, and covers the upper side of the rotary 21.

The rear cover 23 is a structure having a cover plate 231 formed in an arc shape from the middle part to the rear end part. The rear cover 23 is arranged so that the front side of the cover plate 231 is along the rotary 21, and covers the rear of the rotary 21. Further, the rear cover 23 is arranged so that a part of the cover plate 231 is in contact with the field, and evens the unevenness of the field. The rear cover 23 is rotatable by a hinge 222 provided on the rotary cover 22 (see arrows Re and Rf in FIG. 10).

The gear unit 24 is a structure that houses a plurality of gears inside the case 24c. The gear unit 24 rotates a drive shaft passing inside the pipe case 27 and transmits rotational power to the rotary 21. The gear unit 24 is arranged at the central portion in the left-right direction according to the position of the PTO drive device. The pipe case 27 is arranged parallel to the left-right direction along the upper surface of the rotary cover 22. The pipe case 27 has a role of improving the rigidity of the tillage implement 2.

Further, the tiller 2 is equipped with 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 welded to the rear cover 23. The hanger bracket 251 extends upward from the rear cover 23. The hanger bracket 251 has a hinge portion in which two plates are arranged in parallel. The hinge portion is provided with a pin hole that horizontally penetrates the two plates.

The hanger stay 252 is welded to the rotary cover 22. The hanger stay 252 extends from the frame pipe 28 toward the upper rear 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 in which a pin is slidable. The frame pipe 28 is arranged rearward of the pipe case 27 and parallel to the left-right direction along the upper surface of the rotary cover 22. The frame pipe 28 also has a role of improving the rigidity of the tillage implement 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) with the pin hole of the clevis attached to the base end portion and the pin hole of the hanger bracket 251 overlapping each other. Is linked to. The hanger rod 253 is slidably supported along the inner circumference of the hanger stay 252 by inserting the tip end thereof into the rod hole of the guide piece forming the hanger stay 252. The hanger rod 253 is provided with a pin hole that vertically penetrates the peripheral surface thereof.

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 tiller 2 is provided with a tilling depth transmission mechanism 26.

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

The tilling depth transmission mechanism 26 includes a stay 261, a rod 262, an arm 263, a push-pull wire 264, and a link lever 265.

The stay 261 is fixed to the rear cover 23. A rod hole is formed at one end of the stay 261. Then, a hooking portion obtained by bending one end of the rod 262 is inserted into the rod hole of the stay 261, and the hooking portion is fastened with a snap pin. In this way, the rod 262 is connected to the stay 261. The stay 261 is fixed to the right side of the gear unit 24 and the upper surface of the rear cover 23. Further, the rod 262 is arranged from the stay 261 to the arm 263 so as to face upward and upward.

The arm 263 is rotatably supported by the arm bracket 263B (see FIG. 11A). The arm bracket 263B is fixed along the upper surface and the side surface of the hanger stay 252 (see FIG. 11A). A rod hole is formed at one end of the arm 263. A hooking portion obtained by bending the other end of the rod 262 is inserted into the rod hole of the arm 263, and the hooking portion is fastened with a snap pin. Therefore, the arm 263 is rotated by the rod 262. A pin hole is formed at the other end of the arm 263. A pin is inserted into the pin hole of the arm 263 together with a pin hole at 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 arm 263. The arm 263 is arranged 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 surround the rear side of the gear unit 24 from the arm 263 to the link lever 265. At this time, the push-pull wire 264 is held with one end thereof being sandwiched in the notch of the arm bracket 263B. The push-pull wire 264 is fixed by a wiring along the upper surface of the rotary cover 22. Then, the push-pull wire 264 passes above the left and right pipe cases 27.

The link lever 265 is rotatably supported by a link lever bracket 265B (see FIG. 11B). The link lever bracket 265B is vertically fixed to the pipe case 27 on the front side of the pipe case 27 (see FIG. 11B). A pin hole is formed at one end of the link lever 265. A pin is inserted into the pin hole of the link lever 265 together with a 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 link lever 265 is rotated by the push-pull wire 264. Further, a contact portion 265T is formed at the other end of the link lever 265. The contact portion 265T of the link lever 265 is fitted with the contact portion 181T of the auto lever 181 (see FIG. 12). The link lever 265 is arranged on the left side of the gear unit 24 and on the front side of the pipe case 27.

Next, an operation mode of the main tillage implement 2 will be described.

FIG. 10 shows a situation in which the rear cover 23 rotates in accordance with the plowing depth D. In the drawing, the front-back direction and the vertical direction of the tractor 1 are shown.

As shown in FIG. 10A, when the field is soft, the rotary 21 sinks deep into the field. At this time, the rear cover 23 rotates upward because the surface of the field relatively rises (see arrow Re). Then, the stay 261 pushes up the rod 262, and the rod 262 rotates the arm 263 in one direction. Then, the arm 263 pulls the push-pull wire 264 (see arrow M in FIG. 9). In this way, the push-pull wire 264 rotates the link lever 265 in one direction. In this way, when the rear cover 23 rotates upward, the cultivating implement 2 pulls the push-pull wire 264 and rotates the link lever 267 in one direction. This operation is transmitted to the tractor 1 via the auto lever 181 and the auto wire 182 (see FIG. 12). That is, a physical quantity (stroke quantity) according to the plowing depth D is transmitted to the tractor 1.

As shown in FIG. 10B, when the field is hard, the rotary 21 floats shallowly in the field. At this time, the rear cover 23 is rotated downward because the surface of the field is relatively lowered (see arrow Rf). Then, the stay 261 pulls down the rod 262, and the rod 262 rotates the arm 263 to the other side. Then, the arm 263 pushes the push-pull wire 264 (see arrow N in FIG. 9). In this way, the push-pull wire 264 rotates the link lever 265 to the other side. In this way, when the rear cover 23 rotates downward, the cultivating implement 2 pushes the push-pull wire 264 and rotates the link lever 267 to the other side. This operation is transmitted to the tractor 1 via the auto lever 181 and the auto wire 182 (see FIG. 12). That is, a physical quantity (stroke quantity) according to the plowing depth D is transmitted to the tractor 1.

Below, the main characteristics of the main tillage implement 2 will be described.

As described above, the rear cover 23 is arranged so that a part of the cover plate 231 is in contact with the field, and evens out the unevenness of the field. Therefore, the cover plate 231 is referred to as a “leveling plate 231”.

First, basic matters in the technical field to which the present invention belongs will be described.

FIG. 13 shows the relationship between the amount of soil cultivated by the rotary 21 and the amount of soil leveled by the rear cover 23. FIG. 14 shows the shape of the soil that is pushed up by the ground leveling plate 231 and rises. In the drawing, the front-back direction and the vertical direction of the tractor 1 are shown.

The amount of soil cultivated by the rotary 21 is calculated by the area Sa determined by the plowing depth D and the rotation diameter of the tines 211. The area Sa is uniquely determined by the tilling depth D unless the shape of the tines 211 changes. The amount of soil cultivated by the rotary 21 has a value obtained by multiplying the area Sa by the length of the rotary 21 in the left-right direction.

The amount of soil leveled by the rear cover 23 is calculated by the area Sb determined by the plowing depth D and the shape of the soil raised by the ground leveling plate 231. The area Sb is uniquely determined by the tilling depth D unless the shape of the leveling plate 231 changes. The amount of soil leveled by the rear cover 23 is a value obtained by multiplying the area Sb by the length of the rear cover 23 in the left-right direction.

Here, the rotary 21 and the rear cover 23 are in a front-rear relationship with each other. That is, the rotary 21 is near the front side of the rear cover 23, and the rear cover 23 is near the rear side of the rotary 21. Then, the amount of soil cultivated by the rotary 21 is the amount of soil that the rear cover 23 averages, and the amount of soil that the rear cover 23 averages is the amount of soil cultivated by the rotary 21. Therefore, considering that the length of the rotary 21 in the left-right direction and the length of the rear cover 23 in the left-right direction are substantially the same, it can be understood that the area Sa and the area Sb are approximately equal values. In addition, even when the shape of the ground leveling plate 231 is different, the area Sa and the area Sb are still substantially the same value. However, it should be noted that the shape of the soil raised by the ground leveling plate 231 is different.

The soil pushed and raised by the leveling plate 231 becomes higher along the leveling plate 231 and becomes a small mountain Ms. Since the mountain Ms is close to the ground leveling plate 231, the mountain Ms is pressed with a uniform pressing force P (P1, P2, P3...) From the hem to the top. On the other hand, the shear strength acts on the mountain Ms as a drag force R (R1, R2, R3... ). Since the shear strength is determined by the weight of the soil, the drag force R (R1, R2, R3...) Gradually weakens from the hem toward the top. Therefore, the soil tends to collapse near the top of the mountain Ms, and the soil rises and then repeatedly collapses. This becomes more remarkable as the mountain Ms is higher.

Next, the shape of the ground leveling plate 231 will be described.

FIG. 15 shows the leveling plate 231. FIG. 16 shows the middle part to the rear end part of the leveling plate 231. 17 shows the rear end portion of the ground leveling plate 231. In the drawing, the front-back direction and the vertical direction of the tractor 1 are shown.

The ground leveling plate 231 has a first plate portion 231a formed at its front edge portion. The ground leveling plate 231 is bent along a line La in the left-right direction, and a second plate portion 231b having the line La as a ridge is formed. Further, the leveling plate 231 is bent along a line Lb in the left-right direction, and a third plate portion 231c having the line Lb as a valley line is formed. Furthermore, the leveling plate 231 is bent along a line Lc in the left-right direction, and a fourth plate portion 231d having this line Lc as a ridge is formed. The fourth plate portion 231d is bent in an arc shape about the line Ld in the left-right direction. Therefore, two surfaces connected by the curved surface 231R are formed on the fourth plate portion 231d. In the present application, the front surface that is connected to the curved surface 231R is defined as the “earth pressing surface 231S”. In addition, the rear surface connected to the curved surface 231R is defined as the "earth smooth surface 231T".

The earth pressing surface 231S is a flat portion formed on the fourth plate portion 231d and has a role of pressing the earth. The landslide surface 231S extends to a position closer to the field scene GL than a corresponding portion of the conventional ground leveling plate 231z and is connected to the curved surface 231R. On the other hand, the soil leveling surface 231T is a gently curved portion formed on the fourth plate portion 231d and has a role of leveling the soil. The soil level surface 231T is connected to the curved surface 231R at a position lower than a corresponding portion of the conventional ground leveling plate 231z. Therefore, the curved surface 231R connecting the earth pressing surface 231S and the soil leveling surface 231T has a small bending radius R and a low center position of the bending radius R (height Hd of the bending center C).

More specifically, in the conventional grounding plate 231z, the value of the bending radius Rz is 250 mm, whereas in the grounding plate 231 according to the present embodiment, the value of the bending radius R is 50 mm. .. Further, in the conventional leveling plate 231z, the center position of the bending radius Rz (height Hdz of the bending center Cz) was higher than the average height Hsz of the raised soil, whereas the leveling plate 231 according to the present embodiment. In, the center position of the bending radius R (height Hd of the bending center C) is lower than the average height Hs of the raised soil.

As described above, in the main tillage implement 2, the middle portion of the ground leveling plate 231 forming the rear cover 23 is bent, and the ground leveling plate 231 is provided with the earth pressing surface 231S and the earth level surface 231T. Then, the curved surface 231R connecting the landslide surface 231S and the soil level surface 231T has an average height Hs of the soil bulged when the center position of the bending radius R (height Hd of the bending center C) is pushed by the soil lands surface 231S. Is lower than. As a result, the main tillage implement 2 can raise the soil higher to make it easier to collapse (see arrow A in FIG. 18) and level the collapsed soil (see arrow B in FIG. 18), so that the leveling performance can be improved. improves.

Further, as described above, the bending radius R of the leveling plate 231 in this embodiment is 50 mm. However, it is not limited to this value. This is because the value of 50 mm is derived based on the predetermined condition. Considering the case where the soil clay and other conditions are different, it can be said that there is an advantage in the range of 30 mm to 70 mm.

From the above, the bending radius R may be a value larger than 30 mm and smaller than 70 mm. As a result, the main tillage implement 2 can raise the soil higher to make it easier to collapse (see arrow A in FIG. 18) and level the collapsed soil regardless of the characteristics of the soil (arrow in FIG. 18). (See B), the ground leveling performance is improved.

Furthermore, the leveling plate 231 is bent along a line Le in the left-right direction, and a fifth plate portion 231e having the line Le as a valley line is formed. Further, the ground leveling plate 231 is bent along a line Lf directed to the left and right, and a sixth plate portion 231f having this line Lf as a ridge line is formed. Furthermore, the leveling plate 231 is bent along a line Lg in the left-right direction, and a seventh plate portion 231g having the line Lg as a valley line is formed. In this way, the leveling plate 231 is formed with the groove portion 231U intersecting at right angles with the traveling direction (direction in which the tractor 1 advances). The surfaces of the fifth plate portion 231e to the seventh plate portion 231g are connected to the soil leveling surface 231S of the fourth plate portion 231d, and also have a role of leveling the soil. Therefore, it can be said that the groove portion 231U is formed in the soil level surface 231S.

As described above, the soil level surface 231T is provided with the groove portion 231U in a direction intersecting the traveling direction at a right angle. As a result, in the main tillage implement 2, since the soil rises inside the groove 231U (see arrow C in FIG. 18) and can be leveled again (see arrow D in FIG. 18), the leveling performance is improved.

In addition, the cross-sectional shape of the groove portion 231U is substantially a diagonal shape with two slopes (the surface of the fifth plate portion 231e and the surface of the sixth plate portion 231f) that have the farm scene GL as the base and form an acute angle with respect to the farm scene GL. It has a wedge shape. As a result, in the main tillage implement 2, since the groove portion 231U appropriately presses the soil (see arrow F in FIG. 18), the leveling performance is improved.

Furthermore, the ground leveling plate 231 is bent back in an arc shape around the line Lh in the left-right direction to form an eighth plate portion 231h. The eighth plate portion 231h is welded with its end portion in contact with the fifth plate portion 231e (see the mark *).

That is, the rear cover 23 is welded with its rear end portion bent back and in contact with the inclined plate (fifth plate portion 231e) forming the groove portion 231U. As a result, in the main tillage implement 2, the rigidity of the rear cover 23 is improved.

Below, the rotary 21 which comprises the main tillage implement 2 is demonstrated.

19 to 24 show the arrangement of the tines 211 in the rotary 21. (A) is a view of the rotary 21 as seen from above, and (B) is a view of the rotary 21 as seen from the left. The arrow M in the drawing represents the tilling direction of the rotary 21, and the arrow N in the drawing represents the rotating direction of the rotary 21. In the figure, the numbers attached to the respective tines 211 are shown.

The rotary 21 shown in FIG. 19 includes a total of 30 tines 211. Each tine 211 is fixed while being inserted in the holder of the rotary shaft. The blade of the first tine 211 arranged at the left end is eccentric to the left of the position of the holder, and has a shape that gradually bends to the right toward the tip. The second, third, sixth, seventh, eleventh, twelfth, thirteenth, sixteenth, seventeenth, twenty-first, twenty-second, twenty-third, twenty-sixth, and twenty-seventh tines 211 from the left end are The blade body extends straight from the holder, and is gradually curved to the right as it goes to the tip. Furthermore, from the left end, the 4th, 5th, 8th, 9th, 10th, 14th, 15th, 18th, 19th, 20th, 24th, 25th, 28th, and 29th tines 211 are The blade extends straight from the holder and is gradually curved to the left as it goes to the tip. In the 30th tine 211 from the left end, the blade body is eccentric to the right side of the position of the holder, and has a shape that is gradually curved to the left side toward the tip. When all the tines 211 are projected, the phase angle of the adjacent tines 211 is constant at 12.0 degrees. Further, the first and second, fifth and sixth, tenth and eleventh, fifteenth and sixteenth, twentieth and twenty-first, twenty-fifth and twenty-sixth, twenty-ninth and thirtieth tine 211 are the same. Are arranged on the circumference of.

The rotary 21 shown in FIG. 20 includes 32 tines 211 in total. Each tine 211 is fixed while being inserted in the holder of the rotary shaft. The blade of the first tine 211 arranged at the left end is eccentric to the left of the position of the holder, and has a shape that gradually bends to the right toward the tip. Also, from the left end, the second, third, seventh, eighth, twelfth, thirteenth, seventeenth, eighteenth, nineteenth, twenty-second, twenty-third, twenty-fourth, twenty-seventh, twenty-eighth, twenty-ninth The tine 211 has a blade body that extends straight from the holder, and has a shape that is gradually curved to the right as it approaches the tip. Further, from the left end, the 4th, 5th, 6th, 9th, 10th, 11th, 14th, 15th, 16th, 20th, 21st, 25th, 26th, 30th, 31st The tine 211 has a blade body that extends straight from the holder, and has a shape that is gradually curved to the left as it goes to the tip. In the 32nd tine 211 from the left end, the blade body is eccentric to the right side of the position of the holder, and has a shape that is gradually curved to the left side toward the tip. When all the tines 211 are projected, the phase angles of the adjacent tines 211 are constant at about 11.3 degrees. Also, the first and second, sixth and seventh, eleventh and twelfth, sixteenth and seventeenth, twenty-first and twenty-second, twenty-sixth and twenty-seventh, thirty-first and thirty-second thine 211 are the same. Are arranged on the circumference of.

The rotary 21 shown in FIG. 21 includes a total of 34 tines 211. Each tine 211 is fixed while being inserted in the holder of the rotary shaft. The blade of the first tine 211 arranged at the left end is eccentric to the left of the position of the holder, and has a shape that gradually bends to the right toward the tip. Further, from the left end, the second, third, seventh, eighth, ninth, thirteenth, fourteenth, fifteenth, eighteenth, nineteenth, twenty-third, twenty-fifth, twenty-fifth, twenty-ninth, thirtieth, The 31st tine 211 has a blade body that extends straight from the holder, and has a shape that is gradually curved to the right toward the tip. Furthermore, from the left end, the fourth, fifth, sixth, tenth, eleventh, twelfth, sixteenth, seventeenth, twentieth, twenty-first, twenty-second, twenty-sixth, twenty-seventh, twenty-eighth, thirty-second, thirteenth The 33rd tine 211 has a blade body that extends straight from the holder and has a shape that is gradually curved toward the left side toward the tip. In the 34th tine 211 from the left end, the blade body is eccentric to the right side of the position of the holder, and is gradually curved to the left side toward the tip. When all the tines 211 are projected, the phase angles of the adjacent tines 211 are constant at about 10.6 degrees. Also, the first and second, sixth and seventh, twelfth and thirteenth, seventeenth and eighteenth, twenty-second and twenty-third, twenty-eighth and twenty-ninth, thirty-third and thirty-first thine 211 are the same. Are arranged on the circumference of.

The rotary 21 shown in FIG. 22 includes a total of 38 tines 211. Each tine 211 is fixed while being inserted in the holder of the rotary shaft. The blade of the first tine 211 arranged at the left end is eccentric to the left of the position of the holder, and has a shape that gradually bends to the right toward the tip. Also, from the left end, the second, third, seventh, eighth, ninth, fourteenth, fifteenth, sixteenth, twentieth, twenty-first, twenty-second, twenty-sixth, twenty-seventh, twenty-eighth, twenty-ninth, twenty-third The blades of the 33rd, 34th, and 35th tines 211 extend straight from the holder, and have a shape that is gradually curved to the right toward the tip. Furthermore, from the left end, the 4th, 5th, 6th, 10th, 11th, 12th, 13th, 17th, 18th, 19th, 23rd, 24th, 25th, 30th, 31st, 31st, The thirty-second, thirty-sixth, and thirty-seventh thines 211 have blade bodies that extend straight from the holder and have a shape that is gradually curved toward the left side toward the tip. In the 38th tine 211 from the left end, the blade body is eccentric to the right side of the position of the holder, and has a shape that gradually bends to the left side toward the tip. When all the tines 211 are projected, the phase angles of the adjacent tines 211 are constant at about 9.5 degrees. The first and second, sixth and seventh, thirteenth and fourteenth, nineteenth and twentieth, twenty-fifth and twenty-sixth, thirty-second and thirty-third, thirty-seventh and thirty-eighth tines 211 are the same. Are arranged on the circumference of.

The rotary 21 shown in FIG. 23 includes a total of 40 tines 211. Each tine 211 is fixed while being inserted in the holder of the rotary shaft. The blade of the first tine 211 arranged at the left end is eccentric to the left of the position of the holder, and has a shape that gradually bends to the right toward the tip. In addition, from the left end, the second, third, fourth, fifth, ninth, tenth, eleventh, fifteenth, sixteenth, seventeenth, twenty-first, twenty-second, twenty-third, twenty-seventh, twenty-eighth The blades of the 29th, 33rd, 34th, and 35th tines 211 extend straight from the holder, and are gradually curved to the right as they extend toward the tip. Further, from the left end, the sixth, seventh, eighth, twelfth, thirteenth, fourteenth, eighteenth, nineteenth, twentieth, twenty-fourth, twenty-fifth, thirty-third, thirty-first, thirty-first, thirty-second, The blades of the 36th, 37th, 38th, and 39th tines 211 extend straight from the holder, and have a shape in which the blades are gradually curved toward the left side toward the tip. In the 40th tine 211 from the left end, the blade body is eccentric to the right of the position of the holder, and has a shape that is gradually curved to the left as it goes to the tip. In addition, when all the tines 211 are projected, the phase angles of the adjacent tines 211 are constant at about 9.0 degrees. The first and second, eighth and ninth, fourteenth and fifteenth, twenty and twenty-first, twenty-sixth and twenty-seventh, thirty-second and thirty-third, thirty-ninth and fortyth thine 211 are the same. Are arranged on the circumference of.

The rotary 21 shown in FIG. 24 includes a total of 42 tines 211. Each tine 211 is fixed while being inserted in the holder of the rotary shaft. The blade of the first tine 211 arranged at the left end is eccentric to the left of the position of the holder, and has a shape that gradually bends to the right toward the tip. Also, from the left end, the second, third, sixth, seventh, eighth, eleventh, twelfth, thirteenth, seventeenth, eighteenth, nineteenth, twenty-second, twenty-third, twenty-seventh, twenty-eighthth The blades of the 29th, 33rd, 34th, 38th, and 39th tines 211 extend straight from the holder, and are gradually curved to the right toward the tip. Further, from the left end, the fourth, fifth, ninth, tenth, fourteenth, fifteenth, sixteenth, twenty, twenty-first, twenty-fourth, twenty-fifth, twenty-sixth, thirtieth, thirty-first, thirty-second, thirteenth The blades of the 35th, 36th, 37th, 40th, and 41st tines 211 extend straight from the holder, and have a shape in which the blades are gradually curved toward the left side toward the tip. In the 42nd tine 211 from the left end, the blade body is eccentric to the right side of the position of the holder, and has a shape in which the blade gradually bends to the left side toward the tip. In addition, when all the tines 211 are projected, the phase angles of the adjacent tines 211 are constant at about 8.6 degrees. Also, the first and second, the fifth and sixth, the tenth and eleventh, the sixteenth and seventeenth, the twenty-first and twenty-second, the twenty-sixth and twenty-seventh, the thirty-two and thirty-third, the thirty-seventh and thirty-eighth. The 41st and 42nd tines 211 are arranged on the same circumference.

1 tractor 2 cultivator 21 rotary 23 rear cover 231 cover plate (leveling plate)
231R Curved surface 231S Soil surface 231T Soil level surface 231U Groove C Bending center R Bending radius Hd Bending center height Hs Average height of raised soil Ms Mountain GL Field scene

The present invention relates to a tillage implement.

Conventionally, a tractor that is a typical work vehicle is known (see Patent Document 1). The tractor can pull various work machines. For example, it is possible to pull a tilling implement that cultivates a field by rotating a rotary.

By the way, the cultivator is provided with a rear cover so as to level the field cultivated by the rotary (see Patent Document 2). The rear cover has a grounding plate formed in an arc shape from the middle part to the rear end part, and is arranged so that a part of the grounding plate contacts the field. Therefore, the rear cover can fill the dent while pushing the soil to even out the unevenness of the field. However, the conventional tiller has a problem that it cannot be leveled even when the unevenness of the field is large. In other words, there is a problem that it is not possible to even out the level when the unevenness of the field is large, such as when the ruts of the tire are deep or when the soil excavated by the rotary is piled up high. Therefore, there has been a demand for a tillage implement with improved leveling performance.

JP, 2005-188430, A JP, 2005-181401, A

Provide a tilling implement with improved leveling performance.

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

The invention according to claim 1 is a tilling machine comprising a rotary having a tilling claw, a rotary cover, and a rear cover, and an earth pressing surface for pushing the soil cultivated by the rotary, and a soil leveling surface for leveling the soil cultivated by the rotary. The ground leveling plate constituting the rear cover is bent at a midway portion thereof, and the ground leveling plate is provided with the embossed surface and the soil level surface .

In the invention according to claim 2, the earth pressing surface and the soil leveling surface are connected by a curved surface provided on the ground leveling plate .

In the invention according to claim 3, a groove is provided on the soil level surface in a direction intersecting with the traveling direction .

In the invention according to claim 4, the cross-sectional shape of the groove has two slopes whose base is the field scene and which forms an acute angle with the field scene .

In the invention according to claim 5, the rear end of the leveling plate is bent back, and the rear end of the leveling plate is provided in contact with the slope forming the groove. ..

The effects of the present invention are as follows.

According to the present invention, regardless of the characteristics of the soil, it is possible to raise the soil higher to make it easier to collapse, and to even out the collapsed soil, thus improving the leveling performance.

The figure which shows a tractor. The figure which shows the link mechanism of a tractor. The figure which shows the raising/lowering operation of the tillage implement. The figure which shows the tilting operation of the tillage implement. The figure which shows the tillage implement. 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 the tilling depth transmission mechanism. The figure which shows the condition which a rear cover rotates according to the plowing depth. The figure which shows some details of the tillage implement. The figure which shows the structure in which a tillage implement is connected via a hitch member. The figure which shows the relationship between the amount of soil cultivated by the rotary and the amount of soil leveled by the rear cover. The figure which shows the shape of the soil which was pushed up by the leveling board and raised. The figure which shows a leveling board. The figure which shows the rear end part from the middle part of the ground leveling plate. The figure which shows the rear end part of the leveling board. The figure which shows the condition where the unevenness|corrugation of a field is leveled. The figure which shows arrangement|positioning of the tine in a rotary. The figure which shows arrangement|positioning of the tine in a rotary. The figure which shows arrangement|positioning of the tine in a rotary. The figure which shows arrangement|positioning of the tine in a rotary. The figure which shows arrangement|positioning of the tine in a rotary. The figure which shows arrangement|positioning of the tine in a rotary.

First, the tractor 1 will be briefly described.

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

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

The frame 11 forms a skeleton in the front part of the tractor 1. The frame 11 constitutes a 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 the thermal energy obtained by burning the fuel into kinetic energy. That is, the engine 12 produces 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 equipped 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. Rotational power of the engine 12 is input to the front axle 14 via the transmission 13. A steering device is provided in parallel with the front axle 14. 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. 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 an operator operates a switch, the PTO drive device inputs rotational power to a work machine to be towed (such as a tilling work machine 2 or 3 described later).

Next, the link mechanism 17 will be described.

FIG. 2 shows the link mechanism 17 of the tractor 1. Below, it demonstrates on the assumption that the tilling implement 2 is connected through the hitch member 18 (refer FIG. 12). In addition, FIG. 3 has shown the raising/lowering operation of the tillage implement 2. FIG. 4 shows a tilting operation of the tilling implement 2. In the figure, the front-back direction, the left-right direction, and the up-down direction of the tractor 1 are shown.

The link mechanism 17 includes a top bracket 171 and a top link 172. Further, 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 portion is provided with a pin hole that horizontally penetrates the two plates.

The top link 172 is attached to the hinge portion of the top bracket 171. The top link 172 is rotatably connected about the pin P1 by inserting the pin P1 with the pin hole of the clevis attached to the base end portion and the pin hole of the top bracket 171 overlapping each other. ing. Further, the top link 172 is rotatably connected about the pin P2 by inserting the pin P2 with the pin hole of the clevis attached to the tip end and the pin hole of the hitch member 18 being overlapped with each other. (See FIG. 12). The tiller 2 is hooked on the hook 18F of the hitch member 18 (see FIG. 12).

The lower bracket 173 is attached to the lower portion of the transmission 13. The lower bracket 173 has a hinge portion in which two plates are arranged in parallel. The hinge portion is provided with a pin hole that horizontally penetrates the two plates.

The lower link 174 is attached to the hinge portion of the lower bracket 173. The lower link 174 is rotatably connected about the pin by inserting a pin (not shown) in a state in which the pin hole provided at the base end portion and the pin hole of the lower bracket 173 are overlapped with each other. ing. Further, the lower link 174 is rotatably connected about the rod 18R by hooking the hook 17F provided at the tip end thereof to the rod 18R of the hitch member 18 (see FIG. 12). The tiller 2 is fixed by fitting the rod 29 and the slit of the hitch member 18 (see FIG. 12).

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

The lifting actuator 176 is attached to the upper portion of the transmission 13. A cylinder of the lifting actuator 176 is formed on the upper cover of the transmission 13 and is integrated as a part of the transmission 13. The lifting actuator 176 has a pivot pin attached to the piston rod, and the pivot pin is in contact with the 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 has a pin (not shown) inserted in a state in which a pin hole of a clevis attached to a base end portion and a pin hole of a universal joint (not shown) are overlapped with each other, thereby centering the pin. Is rotatably connected as. Further, 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 distal end portion and the pin hole of the lower link 174 overlapping each other. Is linked to.

The tilt actuator 178 is attached to the right lift arm 175 and the lower link 174. The tilt actuator 178 has a pin (not shown) inserted with the pin hole of the clevis attached to the cylinder and the pin hole of the universal joint (not shown) overlapped with each other. It is rotatably connected. Further, the tilting actuator 178 rotates about the pin by inserting a pin (not shown) in a state in which the pin hole of the clevis attached to the piston rod and the pin hole of the lower link 174 are overlapped with each other. It is freely connected.

With such a structure, when the piston rod of the lifting actuator 176 slides and is pushed out (when the lifting actuator 176 extends), the lift arm 175 rotates upward. Then, the lift arm 175 pulls up the left and right lower links 174 via the lift link 177 and the tilting actuator 178, so that the height of the tiller 2 becomes high (see the arrow Ra in FIG. 3A). Therefore, if such an operation is realized when the tilling implement 2 sinks, the tilling depth will be maintained in a constant state.

On the contrary, when the piston rod of the lifting actuator 176 slides and is retracted (when the lifting 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 tiller 2 becomes low (see arrow Rb in FIG. 3(B)). Therefore, if such an operation is realized when the tilling implement 2 is lifted, the tilling depth is maintained in a constant state.

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

On the contrary, when the piston rod of the tilt actuator 178 slides and is retracted (when the tilt actuator 178 contracts), only the right lower link 174 to which the tilt actuator 178 is attached rotates upward. Become. Then, the lower link 174 on the left side is maintained as it is, while the lower link 174 on the right side is pulled up, so that the tilling implement 2 tilts upward to the right (see arrow Rd in FIG. 4B). Therefore, if such an operation is realized when the tractor 1 is tilted to the right, the tilling implement 2 will be maintained in a horizontal state.

Next, the tillage implement 2 will be described.

FIG. 5 shows the tillage implement 2. 6 is a diagram viewed from the arrow X in FIG. 5, and FIG. 7 is a diagram viewed from the arrow Y in FIG. Further, FIG. 8 is a diagram viewed from the arrow Z in FIG. In the figure, the front-back direction, the left-right direction, and the up-down direction of the tractor 1 are shown.

The tillage implement 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 211 are attached around the rotation axis. In the rotary 21, the tines 211 rotate together with the rotary shaft to cultivate the field.

The rotary cover 22 is a structure having a cover plate 221 formed in an arc shape from the front end portion to the rear end portion. The rotary cover 22 is arranged so that the cover plate 221 extends along the rotary 21, and covers the upper side of the rotary 21.

The rear cover 23 is a structure having a cover plate 231 formed in an arc shape from the middle part to the rear end part. The rear cover 23 is arranged so that the front side of the cover plate 231 is along the rotary 21, and covers the rear of the rotary 21. Further, the rear cover 23 is arranged so that a part of the cover plate 231 is in contact with the field, and evens the unevenness of the field. The rear cover 23 is rotatable by a hinge 222 provided on the rotary cover 22 (see arrows Re and Rf in FIG. 10).

The gear unit 24 is a structure that houses a plurality of gears inside the case 24c. The gear unit 24 rotates a drive shaft passing inside the pipe case 27 and transmits rotational power to the rotary 21. The gear unit 24 is arranged at the central portion in the left-right direction according to the position of the PTO drive device. The pipe case 27 is arranged parallel to the left-right direction along the upper surface of the rotary cover 22. The pipe case 27 has a role of improving the rigidity of the tillage implement 2.

Further, the tiller 2 is equipped with 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 welded to the rear cover 23. The hanger bracket 251 extends upward from the rear cover 23. The hanger bracket 251 has a hinge portion in which two plates are arranged in parallel. The hinge portion is provided with a pin hole that horizontally penetrates the two plates.

The hanger stay 252 is welded to the rotary cover 22. The hanger stay 252 extends from the frame pipe 28 toward the upper rear 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 in which a pin is slidable. The frame pipe 28 is arranged rearward of the pipe case 27 and parallel to the left-right direction along the upper surface of the rotary cover 22. The frame pipe 28 also has a role of improving the rigidity of the tillage implement 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) with the pin hole of the clevis attached to the base end portion and the pin hole of the hanger bracket 251 overlapping each other. Is linked to. The hanger rod 253 is slidably supported along the inner circumference of the hanger stay 252 by inserting the tip end thereof into the rod hole of the guide piece forming the hanger stay 252. The hanger rod 253 is provided with a pin hole that vertically penetrates the peripheral surface thereof.

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 tiller 2 is provided with a tilling depth transmission mechanism 26.

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

The tilling depth transmission mechanism 26 includes a stay 261, a rod 262, an arm 263, a push-pull wire 264, and a link lever 265.

The stay 261 is fixed to the rear cover 23. A rod hole is formed at one end of the stay 261. Then, a hooking portion obtained by bending one end of the rod 262 is inserted into the rod hole of the stay 261, and the hooking portion is fastened with a snap pin. In this way, the rod 262 is connected to the stay 261. The stay 261 is fixed to the right side of the gear unit 24 and the upper surface of the rear cover 23. Further, the rod 262 is arranged from the stay 261 to the arm 263 so as to face upward and upward.

The arm 263 is rotatably supported by the arm bracket 263B (see FIG. 11A). The arm bracket 263B is fixed along the upper surface and the side surface of the hanger stay 252 (see FIG. 11A). A rod hole is formed at one end of the arm 263. A hooking portion obtained by bending the other end of the rod 262 is inserted into the rod hole of the arm 263, and the hooking portion is fastened with a snap pin. Therefore, the arm 263 is rotated by the rod 262. A pin hole is formed at the other end of the arm 263. A pin is inserted into the pin hole of the arm 263 together with a pin hole at 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 arm 263. The arm 263 is arranged 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 surround the rear side of the gear unit 24 from the arm 263 to the link lever 265. At this time, the push-pull wire 264 is held with one end thereof being sandwiched in the notch of the arm bracket 263B. The push-pull wire 264 is fixed by a wiring along the upper surface of the rotary cover 22. Then, the push-pull wire 264 passes above the left and right pipe cases 27.

The link lever 265 is rotatably supported by a link lever bracket 265B (see FIG. 11B). The link lever bracket 265B is vertically fixed to the pipe case 27 on the front side of the pipe case 27 (see FIG. 11B). A pin hole is formed at one end of the link lever 265. A pin is inserted into the pin hole of the link lever 265 together with a 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 link lever 265 is rotated by the push-pull wire 264. Further, a contact portion 265T is formed at the other end of the link lever 265. The contact portion 265T of the link lever 265 is fitted with the contact portion 181T of the auto lever 181 (see FIG. 12). The link lever 265 is arranged on the left side of the gear unit 24 and on the front side of the pipe case 27.

Next, an operation mode of the main tillage implement 2 will be described.

FIG. 10 shows a situation in which the rear cover 23 rotates in accordance with the plowing depth D. In the drawing, the front-back direction and the vertical direction of the tractor 1 are shown.

As shown in FIG. 10A, when the field is soft, the rotary 21 sinks deep into the field. At this time, the rear cover 23 rotates upward because the surface of the field relatively rises (see arrow Re). Then, the stay 261 pushes up the rod 262, and the rod 262 rotates the arm 263 in one direction. Then, the arm 263 pulls the push-pull wire 264 (see arrow M in FIG. 9). In this way, the push-pull wire 264 rotates the link lever 265 in one direction. In this way, when the rear cover 23 rotates upward, the cultivating implement 2 pulls the push-pull wire 264 and rotates the link lever 267 in one direction. This operation is transmitted to the tractor 1 via the auto lever 181 and the auto wire 182 (see FIG. 12). That is, a physical quantity (stroke quantity) according to the plowing depth D is transmitted to the tractor 1.

As shown in FIG. 10B, when the field is hard, the rotary 21 floats shallowly in the field. At this time, the rear cover 23 is rotated downward because the surface of the field is relatively lowered (see arrow Rf). Then, the stay 261 pulls down the rod 262, and the rod 262 rotates the arm 263 to the other side. Then, the arm 263 pushes the push-pull wire 264 (see arrow N in FIG. 9). In this way, the push-pull wire 264 rotates the link lever 265 to the other side. In this way, when the rear cover 23 rotates downward, the cultivating implement 2 pushes the push-pull wire 264 and rotates the link lever 267 to the other side. This operation is transmitted to the tractor 1 via the auto lever 181 and the auto wire 182 (see FIG. 12). That is, a physical quantity (stroke quantity) according to the plowing depth D is transmitted to the tractor 1.

Below, the main characteristics of the main tillage implement 2 will be described.

As described above, the rear cover 23 is arranged so that a part of the cover plate 231 is in contact with the field, and evens out the unevenness of the field. Therefore, the cover plate 231 is referred to as a “leveling plate 231”.

First, basic matters in the technical field to which the present invention belongs will be described.

FIG. 13 shows the relationship between the amount of soil cultivated by the rotary 21 and the amount of soil leveled by the rear cover 23. FIG. 14 shows the shape of the soil that is pushed up by the ground leveling plate 231 and rises. In the drawing, the front-back direction and the vertical direction of the tractor 1 are shown.

The amount of soil cultivated by the rotary 21 is calculated by the area Sa determined by the plowing depth D and the rotation diameter of the tines 211. The area Sa is uniquely determined by the tilling depth D unless the shape of the tines 211 changes. The amount of soil cultivated by the rotary 21 has a value obtained by multiplying the area Sa by the length of the rotary 21 in the left-right direction.

The amount of soil leveled by the rear cover 23 is calculated by the area Sb determined by the plowing depth D and the shape of the soil raised by the ground leveling plate 231. The area Sb is uniquely determined by the tilling depth D unless the shape of the leveling plate 231 changes. The amount of soil leveled by the rear cover 23 is a value obtained by multiplying the area Sb by the length of the rear cover 23 in the left-right direction.

Here, the rotary 21 and the rear cover 23 are in a front-rear relationship with each other. That is, the rotary 21 is near the front side of the rear cover 23, and the rear cover 23 is near the rear side of the rotary 21. Then, the amount of soil cultivated by the rotary 21 is the amount of soil that the rear cover 23 averages, and the amount of soil that the rear cover 23 averages is the amount of soil cultivated by the rotary 21. Therefore, considering that the length of the rotary 21 in the left-right direction and the length of the rear cover 23 in the left-right direction are substantially the same, it can be understood that the area Sa and the area Sb are approximately equal values. In addition, even when the shape of the ground leveling plate 231 is different, the area Sa and the area Sb are still substantially the same value. However, it should be noted that the shape of the soil raised by the ground leveling plate 231 is different.

The soil pushed and raised by the leveling plate 231 becomes higher along the leveling plate 231 and becomes a small mountain Ms. Since the mountain Ms is close to the ground leveling plate 231, the mountain Ms is pressed with a uniform pressing force P (P1, P2, P3...) From the hem to the top. On the other hand, the shear strength acts on the mountain Ms as a drag force R (R1, R2, R3... ). Since the shear strength is determined by the weight of the soil, the drag force R (R1, R2, R3...) Gradually weakens from the hem toward the top. Therefore, the soil tends to collapse near the top of the mountain Ms, and the soil rises and then repeatedly collapses. This becomes more remarkable as the mountain Ms is higher.

Next, the shape of the ground leveling plate 231 will be described.

FIG. 15 shows the leveling plate 231. FIG. 16 shows the middle part to the rear end part of the leveling plate 231. 17 shows the rear end portion of the ground leveling plate 231. In the drawing, the front-back direction and the vertical direction of the tractor 1 are shown.

The ground leveling plate 231 has a first plate portion 231a formed at its front edge portion. The ground leveling plate 231 is bent along a line La in the left-right direction, and a second plate portion 231b having the line La as a ridge is formed. Further, the leveling plate 231 is bent along a line Lb in the left-right direction, and a third plate portion 231c having the line Lb as a valley line is formed. Furthermore, the leveling plate 231 is bent along a line Lc in the left-right direction, and a fourth plate portion 231d having this line Lc as a ridge is formed. The fourth plate portion 231d is bent in an arc shape about the line Ld in the left-right direction. Therefore, two surfaces connected by the curved surface 231R are formed on the fourth plate portion 231d. In the present application, the front surface that is connected to the curved surface 231R is defined as the “earth pressing surface 231S”. In addition, the rear surface connected to the curved surface 231R is defined as the "earth smooth surface 231T".

The earth pressing surface 231S is a flat portion formed on the fourth plate portion 231d and has a role of pressing the earth. The landslide surface 231S extends to a position closer to the field scene GL than a corresponding portion of the conventional ground leveling plate 231z and is connected to the curved surface 231R. On the other hand, the soil leveling surface 231T is a gently curved portion formed on the fourth plate portion 231d and has a role of leveling the soil. The soil level surface 231T is connected to the curved surface 231R at a position lower than a corresponding portion of the conventional ground leveling plate 231z. Therefore, the curved surface 231R connecting the earth pressing surface 231S and the soil leveling surface 231T has a small bending radius R and a low center position of the bending radius R (height Hd of the bending center C).

More specifically, in the conventional grounding plate 231z, the value of the bending radius Rz is 250 mm, whereas in the grounding plate 231 according to the present embodiment, the value of the bending radius R is 50 mm. .. Further, in the conventional leveling plate 231z, the center position of the bending radius Rz (height Hdz of the bending center Cz) was higher than the average height Hsz of the raised soil, whereas the leveling plate 231 according to the present embodiment. In, the center position of the bending radius R (height Hd of the bending center C) is lower than the average height Hs of the raised soil.

As described above, in the main tillage implement 2, the middle portion of the ground leveling plate 231 forming the rear cover 23 is bent, and the ground leveling plate 231 is provided with the earth pressing surface 231S and the earth level surface 231T. Then, the curved surface 231R connecting the landslide surface 231S and the soil level surface 231T has an average height Hs of the soil bulged when the center position of the bending radius R (height Hd of the bending center C) is pushed by the soil lands surface 231S. Is lower than. As a result, the main tillage implement 2 can raise the soil higher to make it easier to collapse (see arrow A in FIG. 18) and level the collapsed soil (see arrow B in FIG. 18), so that the leveling performance can be improved. improves.

Further, as described above, the bending radius R of the leveling plate 231 in this embodiment is 50 mm. However, it is not limited to this value. This is because the value of 50 mm is derived based on the predetermined condition. Considering the case where the soil clay and other conditions are different, it can be said that there is an advantage in the range of 30 mm to 70 mm.

From the above, the bending radius R may be a value larger than 30 mm and smaller than 70 mm. As a result, the main tillage implement 2 can raise the soil higher to make it easier to collapse (see arrow A in FIG. 18) and level the collapsed soil regardless of the characteristics of the soil (arrow in FIG. 18). (See B), the ground leveling performance is improved.

Furthermore, the leveling plate 231 is bent along a line Le in the left-right direction, and a fifth plate portion 231e having the line Le as a valley line is formed. Further, the ground leveling plate 231 is bent along a line Lf directed to the left and right, and a sixth plate portion 231f having this line Lf as a ridge line is formed. Furthermore, the leveling plate 231 is bent along a line Lg in the left-right direction, and a seventh plate portion 231g having the line Lg as a valley line is formed. In this way, the leveling plate 231 is formed with the groove portion 231U intersecting at right angles with the traveling direction (direction in which the tractor 1 advances). The surfaces of the fifth plate portion 231e to the seventh plate portion 231g are connected to the soil leveling surface 231S of the fourth plate portion 231d, and also have a role of leveling the soil. Therefore, it can be said that the groove portion 231U is formed in the soil level surface 231S.

As described above, the soil level surface 231T is provided with the groove portion 231U in a direction intersecting the traveling direction at a right angle. As a result, in the main tillage implement 2, since the soil rises inside the groove 231U (see arrow C in FIG. 18) and can be leveled again (see arrow D in FIG. 18), the leveling performance is improved.

In addition, the cross-sectional shape of the groove portion 231U is substantially a diagonal shape with two slopes (the surface of the fifth plate portion 231e and the surface of the sixth plate portion 231f) that have the farm scene GL as the base and form an acute angle with respect to the farm scene GL. It has a wedge shape. As a result, in the main tillage implement 2, since the groove portion 231U appropriately presses the soil (see arrow F in FIG. 18), the leveling performance is improved.

Furthermore, the ground leveling plate 231 is bent back in an arc shape around the line Lh in the left-right direction to form an eighth plate portion 231h. The eighth plate portion 231h is welded with its end portion in contact with the fifth plate portion 231e (see the mark *).

That is, the rear cover 23 is welded with its rear end portion bent back and in contact with the inclined plate (fifth plate portion 231e) forming the groove portion 231U. As a result, in the main tillage implement 2, the rigidity of the rear cover 23 is improved.

Below, the rotary 21 which comprises the main tillage implement 2 is demonstrated.

19 to 24 show the arrangement of the tines 211 in the rotary 21. (A) is a view of the rotary 21 as seen from above, and (B) is a view of the rotary 21 as seen from the left. The arrow M in the drawing represents the tilling direction of the rotary 21, and the arrow N in the drawing represents the rotating direction of the rotary 21. In the figure, the numbers attached to the respective tines 211 are shown.

The rotary 21 shown in FIG. 19 includes a total of 30 tines 211. Each tine 211 is fixed while being inserted in the holder of the rotary shaft. The blade of the first tine 211 arranged at the left end is eccentric to the left of the position of the holder, and has a shape that gradually bends to the right toward the tip. The second, third, sixth, seventh, eleventh, twelfth, thirteenth, sixteenth, seventeenth, twenty-first, twenty-second, twenty-third, twenty-sixth, and twenty-seventh tines 211 from the left end are The blade body extends straight from the holder, and is gradually curved to the right as it goes to the tip. Furthermore, from the left end, the 4th, 5th, 8th, 9th, 10th, 14th, 15th, 18th, 19th, 20th, 24th, 25th, 28th, and 29th tines 211 are The blade extends straight from the holder and is gradually curved to the left as it goes to the tip. In the 30th tine 211 from the left end, the blade body is eccentric to the right side of the position of the holder, and has a shape that is gradually curved to the left side toward the tip. When all the tines 211 are projected, the phase angle of the adjacent tines 211 is constant at 12.0 degrees. Further, the first and second, fifth and sixth, tenth and eleventh, fifteenth and sixteenth, twentieth and twenty-first, twenty-fifth and twenty-sixth, twenty-ninth and thirtieth tine 211 are the same. Are arranged on the circumference of.

The rotary 21 shown in FIG. 20 includes 32 tines 211 in total. Each tine 211 is fixed while being inserted in the holder of the rotary shaft. The blade of the first tine 211 arranged at the left end is eccentric to the left of the position of the holder, and has a shape that gradually bends to the right toward the tip. Also, from the left end, the second, third, seventh, eighth, twelfth, thirteenth, seventeenth, eighteenth, nineteenth, twenty-second, twenty-third, twenty-fourth, twenty-seventh, twenty-eighth, twenty-ninth The tine 211 has a blade body that extends straight from the holder, and has a shape that is gradually curved to the right as it approaches the tip. Further, from the left end, the 4th, 5th, 6th, 9th, 10th, 11th, 14th, 15th, 16th, 20th, 21st, 25th, 26th, 30th, 31st The tine 211 has a blade body that extends straight from the holder, and has a shape that is gradually curved to the left as it goes to the tip. In the 32nd tine 211 from the left end, the blade body is eccentric to the right side of the position of the holder, and has a shape that is gradually curved to the left side toward the tip. When all the tines 211 are projected, the phase angles of the adjacent tines 211 are constant at about 11.3 degrees. Also, the first and second, sixth and seventh, eleventh and twelfth, sixteenth and seventeenth, twenty-first and twenty-second, twenty-sixth and twenty-seventh, thirty-first and thirty-second thine 211 are the same. Are arranged on the circumference of.

The rotary 21 shown in FIG. 21 includes a total of 34 tines 211. Each tine 211 is fixed while being inserted in the holder of the rotary shaft. The blade of the first tine 211 arranged at the left end is eccentric to the left of the position of the holder, and has a shape that gradually bends to the right toward the tip. Further, from the left end, the second, third, seventh, eighth, ninth, thirteenth, fourteenth, fifteenth, eighteenth, nineteenth, twenty-third, twenty-fifth, twenty-fifth, twenty-ninth, thirtieth, The 31st tine 211 has a blade body that extends straight from the holder, and has a shape that is gradually curved to the right toward the tip. Furthermore, from the left end, the fourth, fifth, sixth, tenth, eleventh, twelfth, sixteenth, seventeenth, twentieth, twenty-first, twenty-second, twenty-sixth, twenty-seventh, twenty-eighth, thirty-second, thirteenth The 33rd tine 211 has a blade body that extends straight from the holder and has a shape that is gradually curved toward the left side toward the tip. In the 34th tine 211 from the left end, the blade body is eccentric to the right side of the position of the holder, and is gradually curved to the left side toward the tip. When all the tines 211 are projected, the phase angles of the adjacent tines 211 are constant at about 10.6 degrees. Also, the first and second, sixth and seventh, twelfth and thirteenth, seventeenth and eighteenth, twenty-second and twenty-third, twenty-eighth and twenty-ninth, thirty-third and thirty-first thine 211 are the same. Are arranged on the circumference of.

The rotary 21 shown in FIG. 22 includes a total of 38 tines 211. Each tine 211 is fixed while being inserted in the holder of the rotary shaft. The blade of the first tine 211 arranged at the left end is eccentric to the left of the position of the holder, and has a shape that gradually bends to the right toward the tip. Also, from the left end, the second, third, seventh, eighth, ninth, fourteenth, fifteenth, sixteenth, twentieth, twenty-first, twenty-second, twenty-sixth, twenty-seventh, twenty-eighth, twenty-ninth, twenty-third The blades of the 33rd, 34th, and 35th tines 211 extend straight from the holder, and have a shape that is gradually curved to the right toward the tip. Furthermore, from the left end, the 4th, 5th, 6th, 10th, 11th, 12th, 13th, 17th, 18th, 19th, 23rd, 24th, 25th, 30th, 31st, 31st, The thirty-second, thirty-sixth, and thirty-seventh thines 211 have blade bodies that extend straight from the holder and have a shape that is gradually curved toward the left side toward the tip. In the 38th tine 211 from the left end, the blade body is eccentric to the right side of the position of the holder, and has a shape that gradually bends to the left side toward the tip. When all the tines 211 are projected, the phase angles of the adjacent tines 211 are constant at about 9.5 degrees. The first and second, sixth and seventh, thirteenth and fourteenth, nineteenth and twentieth, twenty-fifth and twenty-sixth, thirty-second and thirty-third, thirty-seventh and thirty-eighth tines 211 are the same. Are arranged on the circumference of.

The rotary 21 shown in FIG. 23 includes a total of 40 tines 211. Each tine 211 is fixed while being inserted in the holder of the rotary shaft. The blade of the first tine 211 arranged at the left end is eccentric to the left of the position of the holder, and has a shape that gradually bends to the right toward the tip. In addition, from the left end, the second, third, fourth, fifth, ninth, tenth, eleventh, fifteenth, sixteenth, seventeenth, twenty-first, twenty-second, twenty-third, twenty-seventh, twenty-eighth The blades of the 29th, 33rd, 34th, and 35th tines 211 extend straight from the holder, and are gradually curved to the right as they extend toward the tip. Further, from the left end, the sixth, seventh, eighth, twelfth, thirteenth, fourteenth, eighteenth, nineteenth, twentieth, twenty-fourth, twenty-fifth, thirty-third, thirty-first, thirty-first, thirty-second, The blades of the 36th, 37th, 38th, and 39th tines 211 extend straight from the holder, and have a shape in which the blades are gradually curved toward the left side toward the tip. In the 40th tine 211 from the left end, the blade body is eccentric to the right of the position of the holder, and has a shape that is gradually curved to the left as it goes to the tip. In addition, when all the tines 211 are projected, the phase angles of the adjacent tines 211 are constant at about 9.0 degrees. The first and second, eighth and ninth, fourteenth and fifteenth, twenty and twenty-first, twenty-sixth and twenty-seventh, thirty-second and thirty-third, thirty-ninth and fortyth thine 211 are the same. Are arranged on the circumference of.

The rotary 21 shown in FIG. 24 includes a total of 42 tines 211. Each tine 211 is fixed while being inserted in the holder of the rotary shaft. The blade of the first tine 211 arranged at the left end is eccentric to the left of the position of the holder, and has a shape that gradually bends to the right toward the tip. Also, from the left end, the second, third, sixth, seventh, eighth, eleventh, twelfth, thirteenth, seventeenth, eighteenth, nineteenth, twenty-second, twenty-third, twenty-seventh, twenty-eighthth The blades of the 29th, 33rd, 34th, 38th, and 39th tines 211 extend straight from the holder, and are gradually curved to the right toward the tip. Further, from the left end, the fourth, fifth, ninth, tenth, fourteenth, fifteenth, sixteenth, twenty, twenty-first, twenty-fourth, twenty-fifth, twenty-sixth, thirtieth, thirty-first, thirty-second, thirteenth The blades of the 35th, 36th, 37th, 40th, and 41st tines 211 extend straight from the holder, and have a shape in which the blades are gradually curved toward the left side toward the tip. In the 42nd tine 211 from the left end, the blade body is eccentric to the right side of the position of the holder, and has a shape in which the blade gradually bends to the left side toward the tip. In addition, when all the tines 211 are projected, the phase angles of the adjacent tines 211 are constant at about 8.6 degrees. Also, the first and second, the fifth and sixth, the tenth and eleventh, the sixteenth and seventeenth, the twenty-first and twenty-second, the twenty-sixth and twenty-seventh, the thirty-two and thirty-third, the thirty-seventh and thirty-eighth. The 41st and 42nd tines 211 are arranged on the same circumference.

1 Tractor 2 Tillage implement 21 Rotary 23 Rear cover 231 Cover plate (leveling plate)
231R Curved surface 231S Soil surface 231T Soil level surface 231U Groove C Bending center R Bending radius Hd Bending center height Hs Average height of raised soil Ms Mountain GL Field scene

Claims (8)

Rotary and
In a tilling machine comprising a rear cover for leveling a field cultivated by the rotary,
A middle part of the grounding plate constituting the rear cover is bent to form an earth pressing surface and a soil leveling surface on the grounding plate,
The curved surface that connects the soil pushing surface and the soil leveling surface has a center position of a bending radius lower than an average height of the soil that is pushed up by the soil pushing surface and rises up. The tillage implement according to claim 1, wherein the bending radius is a value larger than 30 mm and smaller than 70 mm. The tillage implement according to claim 1 or 2, wherein the soil level surface is provided with a groove in a direction intersecting at right angles to the traveling direction. 4. The tillage implement according to claim 3, wherein the cross-sectional shape of the groove portion is a substantially wedge shape with the slope at the bottom of the field scene and the two slopes at an acute angle to the field scene. The tiller according to claim 3 or 4, wherein the rear cover is welded in a state where a rear end portion of the rear cover is bent back and is in contact with a slope plate forming the groove. Rotary and
In a tilling machine comprising a rear cover for leveling a field cultivated by the rotary,
A middle part of the grounding plate constituting the rear cover is bent to form an earth pressing surface and a soil leveling surface on the grounding plate,
A tillage implement, wherein the soil level surface is provided with a groove in a direction intersecting at right angles to the traveling direction. 7. The tiller according to claim 6, wherein the cross-sectional shape of the groove portion is a substantially wedge shape having two slopes that form an acute angle with respect to the field scene as the base and the oblique sides. The tiller according to claim 6 or 7, wherein the rear cover is welded in a state where a rear end portion of the rear cover is bent back and is in contact with a slope plate forming the groove.

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