JP2008054575A - Rotary tiller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary tiller set as integrally rotatable in normal direction and reverse direction in right and left both side of a rotary tilling shaft, simplifying configuration and tilling the field into a flat shape in normal rotation and tilling the field to form a ridge in reverse rotation. <P>SOLUTION: The rotary tiller is provided with a right and left tilling shafts 32, 32 switchable as normal rotation or reverse rotation at the lower part of a tilling transmission case 4, and tilling tines 34 mounted on the tilling shafts 32, 32 with curved tips set to face right and left out sides. The tilling tines 34 are mounted to have inclination angles so that the position driving the tine into the soil in the downstream side edge parts locate inside of the right and left position to a position driving the tine into the soil on the upstream side edge in the rotation in tilling with normal rotation, and mounted on the right and left tilling shafts 32, 32, and the tilling tines 34 on both right and left inside are structured to have a larger inclination angle than the inclination angle of the tilling tines 34 on the outside of both right and left side tilling tines 34. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an arrangement of tilling claws attached to a rotary tilling device.

The rotary tiller of the rotary tiller has a symmetrical shape when viewed from the front, and can be used for both forward and reverse rotation, and curved in one direction near the mounting base to the rotary shaft when viewed from the side. And the tip is curved in the other direction to form a recess capable of embracing the soil between the two curved portions, and is on the inner side in the axial direction of the rotary shaft that is coaxial and rotates in the forward and reverse directions. A rotary tilling device in which the concave portion is attached to the rotary shaft and the heart-shaped tilling claw is attached to the rotary shaft on the outer side in the axial direction is known (Patent Document 1).
Japanese Patent No. 3279931

  In the prior art, the rotary tillage shaft is divided in the left-right direction to constitute the forward rotation portion and the reverse rotation portion, and there is a problem that the configuration becomes complicated. Therefore, the present invention is configured so that it can be rotated forward or reverse integrally to both the left and right sides of the rotary tillage shaft, and while simplifying the structure, it is tilled in a flat shape during forward rotation tillage and tilled tillage during reverse rotation tillage. The device is to be provided.

  According to the first aspect of the present invention, left and right tillage shafts (32, 32) that can be switched between forward rotation and reverse rotation are provided at the lower portion of the tillage transmission case (4). 34,...) Are attached so that the bent end of the tip is directed to the left and right sides, and the tilling claw (34,...) Is rotated with respect to the ground driving position of the rotating upper side edge in the forward rotation tillage. The left and right tillage shafts (32, 32) are attached to the left and right tillage shafts (32, 32) with the right and left side surfaces inclined so that the soil driving position is located on the left and right inside, and the left and right tillage claws (32,...) , 34) is configured to be larger than the inclination angle of the left and right outside tilling claws (34,...).

  According to the above configuration, the right and left side surfaces of the tilling claws (34,...) Are inclined in the left-right direction, and during normal tilling, the rotary claw (34,. Rotate the soil so that the edge of the edge on the lower rotation side of the position is located on the left and right inside, and perform the tilling work while reducing the movement of the soil to the left and right outside. Further, at the time of reverse tillage, it rotates so that the ground driving position of the edge on the lower rotation side is located on the left and right outer sides than the soil driving position on the upper edge of the rotation, and the tilling claws (34,. ) Is made larger than the inclination angle of the left and right outside tilling claws (34,...), So that the left and right inside soil near the tillage transmission case (4) can be greatly blown to the left and right outside.

  The invention of claim 2 is provided with left and right tillage shafts (32, 32) that can be switched between forward rotation and reverse rotation at the lower portion of the tillage transmission case (4), and closer to the left and right inner sides of the left and right tillage shafts (32, 32). Are attached to the concave plate claws (36,...) With the concave portions (36b) facing left and right outside, and the concave plate claws (36,...) Concave portions (36b) are formed so that the ground driving position of the lower edge of the rotating side is deviated leftward and rightward relative to the driving position, and the claws are formed on the left and right sides of the left and right tillage shafts (32, 32). (37,...) Is a rotary tiller characterized in that its tip bent portion (37b) is attached to the left and right outer sides.

  According to the above configuration, during forward tillage, the soil is moved to the left and right outside by the concave portion (36b) in which the ground driving position of the rotating lower side edge portion is shifted to the left and right inner side than the soil driving position of the rotating upper side edge portion. In the reverse tillage, the position of the concave plate claw (36,...) In the soil at the lower edge of the rotating side is biased to the left and right outside the position of the soil at the lower edge of the rotating plate. A recessed portion (36b) is formed, and the soil is held in the recessed portion (36b) facing outward, so that it can be largely dissipated to the left and right sides, and large ridges can be formed on both the left and right sides.

  The invention of claim 3 is provided with left and right tillage shafts (32, 32) which can be switched between forward rotation and reverse rotation at the lower part of the tillage transmission case (4), and on the left and right inner sides of the left and right tillage shafts (32, 32). The plate claws (36h,...) Are attached with their bent ends (36i) facing left and right outside, and the plate nail holder (33) is attached to the left and right tillage shafts (32, 32). , 32) is attached so as to be inclined by a predetermined inclination angle α with respect to a reference plane orthogonal to the axis of the axis, and is rotated from the upper edge in the rotational direction in the middle of the plate claw (36h,...). A bulge part (sequentially inflates at a predetermined inclination angle β toward the bending direction of the tip bending part (36i) in the middle of the direction, and sequentially closes the bulge from the middle part toward the lower edge of the rotational direction ( 36k), and the inclination angle α of the claw holder (33) is set to the plate claw (36h, ) Of the plate claw (37h,...) That rotates forward when the plate claw (37h,...) Is attached to the claw holder (33). The rotary tiller is characterized in that the angle β is reduced by the inclination angle α of the claw holder (33) and attached so as to follow the reference plane of the left and right tillage shafts (32, 32).

  According to the above-described configuration, during forward tillage, the upper side portion of the plate claw (36h,...) That is driven into rotation enters the soil substantially straight along the rotation direction, thereby reducing the movement of the soil left and right outside. During the reverse tillage, the inclination angle α of the claw holder (33) and the inclination angle β of the plate claw (36h,...) As a result, a large inclined surface is formed on the left and right outer surfaces of the bulge portion (36k), and the soil moves into the soil while moving the soil to the left and right outer sides. When coming out of the soil, the outer surface of the bulging portion (36k) and the tip bent portion (36i) cooperate to release the soil greatly to the left and right sides, and large ridges are formed on the left and right sides.

  The invention of claim 1 is a simple configuration in which the entire left and right tillage shafts (32, 32) rotate forward or reverse, but can perform relatively good flat tilling during forward tilling and during reverse tilling. The inner soil close to the tillage transmission case (4) can be largely dissipated to the left and right outer sides, so that dredged ridges can be formed on the left and right sides.

  The invention of claim 2 is a simple configuration in which the entire left and right tillage shafts (32, 32) rotate forward or reverse, but can perform relatively good flat tillage during forward turn tillage and during reverse turn tillage. The inner soil close to the tillage transmission case (4) can be largely dissipated to the left and right outer sides, so that dredged ridges can be formed on the left and right sides.

  The invention of claim 3 is a simple configuration in which the entire left and right tillage shafts (32, 32) rotate forward or reverse, but can perform relatively good flat tillage during forward turn tillage and during reverse turn tillage. The inner soil close to the tillage transmission case (4) can be largely dissipated to the left and right outer sides, so that dredged ridges can be formed on the left and right sides.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a side view of a cultivator equipped with the present invention. The body part of the cultivator 1 includes a transmission case 2, an engine frame 3 that extends forward from the lower front side of the transmission case 2, and a cultivating transmission that extends obliquely downward and rearward from the rear side part of the transmission case 2. The handle 4 is configured to extend from the upper rear side of the transmission case 2 to the upper rear side of the rear side. In addition, the mission case 2 and the tillage transmission case 4 are configured as an integral unit, and are configured in a square shape in a side view.

  Then, left and right axles 7 and 7 with left and right wheels 6 and 6 are pivoted on the lower end portion of the mission case 2, and the rotary tiller device including left and right tillage shafts 32 and 32, tillage claws and the like on the lower end portion of the tillage transmission case 4. 8 is provided. An engine 9 is mounted on the engine frame 3, the rotational power of the engine 9 is transmitted to the transmission case 2 via the belt transmission device 10, and the speed change and forward / reverse movement are performed by a transmission transmission device (not shown) in the transmission case 2. Switching, forward travel power and reverse travel power are transmitted to the left and right wheels 7, 7. Further, the working power is branched from the transmission gear transmission (not shown) of the transmission case 2 and transmitted to the rotary tillage device 8 via the tillage transmission device (not shown) in the tillage transmission case 4. It is configured to rotate forward or reverse.

Next, the transmission configuration of the tillage transmission case 4 will be specifically described with reference to FIG. FIG. 2 shows an exploded front view of the transmission configuration.
In the upper part of the transmission case 2, a horizontal main shaft 11, a travel transmission shaft (not shown) and a transmission transmission shaft 13 are mounted in a triangular shape in a side view, and the engine 9 passes through the belt transmission device 10 to the main shaft 11. Power is transmitted.

  In addition, the large and small speed change gears 14a and 14b are spline-fitted to the right side of the main shaft 11 so as to be slidable in the axial direction, and the main shaft gear 15 is fixed to the left side of the main shaft 11. In addition, large and small tillage transmission gears 16a and 16b are provided on the left side of the transmission transmission shaft 13 so as to be rotatable and movable left and right, and on the right side of the transmission transmission shaft 13 are large and small transmission gears for traveling transmission. 17a, 17b and the reverse gear 18 are wedged.

  Further, a tillage transmission shaft 20 and a reverse tillage transmission shaft 21 are mounted below the transmission transmission shaft 13, a gear 23 is wedged on the cultivation transmission shaft 20, and the tillage transmission gear 16 b of the transmission transmission shaft 13 is cultivated. The forward tillage power is transmitted to the tillage shafts 32 and 32 through the gear 23 of the transmission shaft 20 and the tillage chain transmission device 24. Further, the reverse tillage transmission shaft 21 is provided with gears 25a and 25b, and the transmission transmission shaft 13, the tillage transmission shaft 20 and the reverse tillage transmission shaft 21 are arranged in a triangular shape in a side view, and the transmission transmission shaft. The reverse tillage power is transmitted from the 13 large tillage transmission gear 16 a to the tillage chain transmission device 24 through the gear 25 a and gear 25 b of the reverse tillage transmission shaft 21 and the gear 23 of the tillage transmission shaft 20.

  According to the said structure, the tillage transmission gears 16a and 16b of the speed change transmission shaft 13 are shifted right and left with a tillage shifter (illustration omitted), and normal rotation power and reverse rotation power are transmitted to the tillage shafts 32 and 32. be able to.

  Further, left and right tillage transmission shafts 31, 31 are mounted on the lower portion of the tillage transmission case 4, and the left and right tillage transmission shafts 31, 31 are connected to the left and right tillage shafts 32, 32 by pins 32a,. .. Are attached to the claw holders 33,... Provided on the 32, 32 with bolts and nuts so that the bent portions of the tips are directed to the left and right outer sides.

  Further, as shown in FIG. 2, the tilling claws 34,... Have a lower rotation side edge with respect to the position of the upper rotation side edge in the soil during forward rotation tillage (counterclockwise in FIG. 1). The tilling claws 34,... Have a left and right inclined surface so that the position of the soil driven in the soil is on the left and right sides, and the soil at the edge on the upper rotation side during reverse tillage (clockwise in FIG. 1). The tilling claws 34,... Have an inclined surface in the left-right direction so that the soiling position at the edge of the lower rotation side is located on the left and right outside of the middle driving position, and the tips of all the tilling claws 34,. The bent portion is configured to face the left and right outer sides. And, among the tilling claws 34 attached to the left and right tillage shafts 32, 32, for example, two tilling claws 34a, 34a attached on the inner side of the inclined claws 34b,. The inclination angle is large. In addition, the tilling claw 34c located on the inner side is bent to approach the tillage transmission case 4 to reduce the remaining tillage. The tilling claw 34c may be replaced with the tilling claw 34a.

  According to the above configuration, for example, the two tilling claws 34a attached to the inner side are configured to have a larger inclination angle of the inclined surface in the left-right direction than the tilling claws 34b attached to the outer side. The inner soil close to the tillage transmission case 4 can be greatly blown to the left and right outer sides, and canopies can be formed that rise greatly on the left and right sides with the lower part of the tillage transmission case 4 as a groove.

Next, another embodiment of the rotary tiller 8 will be described with reference to FIGS. 3 and 4.
For example, three concave plate claws 36 are arranged near the inner sides of the left and right tillage shafts 32, 32, and the concave portions thereof are directed to the left and right outer sides. 37,... Are attached so that the bent end portions 37b thereof face left and right.

  As shown in FIG. 4A, the concave plate claw 36 is formed of a plate having a narrow base and a wide tip, and the plate is viewed from the side (in a direction perpendicular to the plate surface). The rotating upper side edge at the time of rolling is sequentially bent toward the lower rotating side toward the distal end side, and a blade 36a is formed at the upper edge of the plate in the rotational direction. Then, a concave portion 36b is formed which swells toward the left and right sides from the upper rotation side to the middle in the rotation direction, and sequentially closes from the middle portion to the lower rotation side, and the concave portion 36b is formed at the tip of the concave plate claw 36. A bent portion 36c is formed so as to be closed, and a cutting surface 36d (or a blade portion) orthogonal to the plate surface is formed at the lower edge in the rotational direction of the plate body.

  The concave plate claw 36 may be constituted by a plate having a narrow base portion and a tip portion and a wide middle portion, and a refraction that is refracted to the left and right sides at the base portion of the concave plate claw 36. It is good also as a refractive concave plate-shaped nail | claw 36f to add the part 36e and to deviate the front end side to the left-right one side with respect to the base side attached to the nail | holder nail holder 33.

  Further, as shown in FIG. 4 (B), the above-mentioned nails 37,... Are constituted by a narrow plate body, and the tip end side is bent toward the rotating lower side in a side view of the plate body. A blade portion 37a is formed on the upper edge portion in the rotational direction, a portion extending from the base portion to the tip of the plate body is planar, and a bent portion 37b that is bent toward the left and right sides is formed at the tip portion.

  According to the above configuration, the concave plate claws 36,... Are attached to the inner portions of the left and right tillage shafts 32, 32 so that the recess portions 36b are directed outward, and the ordinary nails are attached to the outer portions of the left and right tillage shafts 32, 32. 37 is disposed. When reverse tillage is performed in this state, the concave plate claws 36,... On the inner side can be largely blown to the left and right while holding the lower part of the soil in the recess 36b, and the left and right sides are reduced while reducing the remaining soil below the tillage transmission case 4. High ridges can be formed on both sides.

Next, another embodiment of the rotary tiller 8 will be described with reference to FIG.
.. Are attached to the inner sides of the left and right tillage shafts 32, 32, for example, so that the tip bent portions 37 b are bent toward the left and right inner sides. The concave plate claw 36,... And one refractive concave plate claw 36f are attached with the concave portion 36b facing inward.

  According to the above-described configuration, normal tilling is performed in a state where the ordinary nail 37,... Are disposed on the inner side, and the concave plate claw 36,. Then, the inner lower nail 37,... Scatters the inner lower soil to the left and right inner sides, and the outer concave plate nail 36,... And the bent concave plate nail holds the outer lower soil in the recess 36b. It is possible to form a wide paddle with a built-in shape below the tillage transmission case 4 while greatly skipping and reducing soil spillage on the left and right sides.

Next, another embodiment of the rotary tiller 8 will be described with reference to FIG.
In the left and right tillage shafts 32, 32, the tip bent portions 36i of the plate claws 36h,. As shown in FIG. 6 (B), the plate body claw is configured such that the base end side of the plate body is narrow in the rotation direction, and is gradually widened in the rotation direction from the base end portion to the midway portion. The tip end portion is configured as a tip bend portion 36i that bends to the left and right sides.

  Further, in the middle part of the plate body, the bulge is sequentially expanded from one end in the rotational direction to the middle part in the rotational direction toward the bending direction of the tip bending part 36i, and the bulge is sequentially performed from the middle part toward the other end in the rotational direction. A bulging portion 36k that closes is formed, and the bulging inclination angle β of the bulging portion 36k is set to the axis of the left and right tillage shafts 32 and 32 as shown in FIG. For example, it is set to be inclined by 8 degrees with respect to the orthogonal reference plane.

  Further, when attaching the plate-shaped claw holder 33 to the left and right tillage shafts 32, 32, as shown in FIG. The upper side of the 33 plate bodies in the rotational direction is attached so as to incline to the outside at an inclination angle α, for example, 5 degrees left and right, and the inclination angle α <the inclination angle β is set.

  According to the above configuration, at the time of forward tillage, the upper portion of the plate claw 36h that is driven to rotate can enter the soil substantially straight and can be tilled without moving the soil left and right. Further, at the time of reverse plowing, the plate claw 36h is driven and rotated on the upper side by the inclined surface α of the claw holder 33 and the inclined angle β of the plate claw 36h, due to the greatly inclined outer surface of the swelling portion 36k. When the lower side portion of the plate claw 36h moves out of the soil, the outer side surface of the bulging portion 36k is removed from the lower side portion of the plate claw 36h. And the tip bending portion 36i can swell the soil largely to the left and right outside to form a large groove below the tillage transmission case 4, while forming a large ridge on both the left and right sides. .

Next, the configuration of the tilling cover 42, the resistance rod 44, and the tail wheel 45 will be described with reference to FIGS.
A tilling frame 41 extends rearward from the top of the tillage transmission case 4, and the inside of the left and right tillage covers 42, 42 is supported on the tilling frame 41 by hinges 42a,... The left and right sides of 42 are in an open state rotated upward, and the left and right tillage covers 42 and 42 are closed in a closed state during normal flat tillage work.

  Also, front and rear support cylinders 43a and 43b are attached to the rear part of the tilling frame 41 along the vertical direction, a resistance bar 44 is supported on the front support cylinder 43a, and the resistance bar 44 can be adjusted up and down by the operation tool 44a. It is configured. A resistance portion 44b that bites into the soil is provided at the lower end portion of the resistance rod 44, and a buoyancy plate 44c is provided in the middle portion of the resistance rod 44. Further, a tail wheel support rod 46 with a tail wheel 45 is supported on the rear support cylinder 43b so as to be vertically adjustable.

  Further, the front support cylinder 43a is provided with a cylindrical holder 47 along the front-rear direction, the tail wheel support rod 46 removed from the rear support cylinder 43b is supported by the holder 47, and a rotary tiller is provided. 8 is configured so that it can be stored above 8.

  According to the said structure, the tail wheel support rod 46 with the tail wheel 45 removed from the back support cylinder 43b is supported by the holder 47, and is accommodated above the rotary tillage device 8, so that the tail wheel 45 can be put in the cultivation soil. It can be a beautiful tillage without any traces. In addition, the tail wheel 45 can be used while being adjusted up and down during the upright work by reverse tillage or when the cultivator 1 is moved, so that these work can be facilitated. Further, since the resistance rod 44 is provided in front of the tail wheel 45, even if residual tilling occurs below the tillage transmission case 4 during the upsetting work by reverse tillage, the resistance rod 44 can scrape off the tillage track. It can be finished neatly.

  Moreover, you may comprise as shown in FIG.11 and FIG.12. Front and rear support cylinders 43a and 43b are provided at the rear portion of the tillage frame 41, and a resistance rod 44 is supported on the front support cylinder 43a by an operating tool 44a so as to be adjustable up and down. A rear support cylinder 43b is supported on the tillage frame 41 so as to be rotatable around a horizontal axis, and a tail wheel support rod 46 with a tail wheel 45 is supported on the support cylinder 43b so as to be rotatable up and down. Yes.

  Then, the tail wheel support rod 46 is used in the up and down direction by the tail wheel holder 48, and the tail wheel 45 is stored in the up and down direction, and the tail wheel 45 is stored in the upper and lower direction. It is configured so that it can be changed.

  The tail wheel holder 48 includes a holding plate 48b that is pivotally supported on the tilling frame 41 by bolts and nuts 48a in the left-right direction, a support hole 48c on the tilling frame 41 side, and a plurality of adjustment holes on the holding plate 48b side. 48d and pins 48e inserted into these holes 48c, 48d,..., And a rear support cylinder 43b is attached to the rear end of the holding plate 48b. Thus, by selectively inserting pins 48e into the plurality of adjustment holes 48d,... On the holding plate 48b side, the tail wheel 45 is changed and supported in the use state or the storage state. According to the said structure, the effect similar to the said embodiment can be anticipated.

  Moreover, you may comprise as FIG. That is, the rear support cylinder 43b can be moved and fixed along the guide guide 51a of the support plate 51 ((a) in FIG. 13), and the tail wheel 45 can be fixed by appropriately fixing the pin on the rear end side of the guide. In the use state, the front end of the guide 51a is reached by sliding forward along the guide 51a while releasing and reversing the fixation ((b) (c) in the figure) ((d) in the figure). Here, it can be put in a housed state by being fixed by pinning or the like as appropriate. If comprised in this way, the tail wheel position of a stowed state will be brought forward, and it will be hard to get in the way of the operator who operates a handle.

  Further, the vertical adjustment configuration of the resistance rod 44 and the tail wheel support rod 46 may be configured as shown in FIG. Front and rear support cylinders 43a and 43b are provided at the rear portion of the tillage frame 41. A resistance bar 44 is supported on the front support cylinder 43a by a resistance bar vertical adjustment device 49 so that the vertical adjustment is possible. A tail wheel support rod 46 with a tail wheel 45 is supported by a tail wheel vertical adjustment device 50 so as to be adjustable in the vertical direction.

  The resistance rod up / down adjustment device 49 includes a screw rod 49a having a screw formed on the outer periphery thereof, a screw cylinder 49b attached to an upper end of the resistance rod 44 and having a screw groove formed on the inner periphery thereof, and a screw rod 49a. The gear 49c is fixed. The tail wheel up / down adjusting device 50 is attached to the upper end of a threaded rod 50a having a screw (in the direction opposite to the screw of the threaded rod 49a) on the outer periphery and the tail wheel support rod 46, and is attached to the inner periphery. A threaded cylinder 50b having a thread groove, a gear 50c fixed to the threaded rod 50a, and a handle 50d attached to the upper end of the threaded rod 50a, the gear 49c and the gear 50c are meshed, The tail wheel 45 and the resistance rod 44 are configured to be vertically adjustable in the same direction.

  According to the above-described configuration, when the handle 50d is operated to adjust the tail wheel 45 up and down and the tilling depth is adjusted during the tilling operation, the resistance rod 44 is also related to the same position. Therefore, at the time of the upsetting work by the reverse tillage, both the tail wheel 45 and the resistance bar 44 can be adjusted up and down, and the remaining tillage generated below the tillage transmission case 4 can be scraped off by the resistance bar 44 to finish the tilling trace cleanly. The tail wheel 45 can be straightly cultivated easily without riding up afterglow.

Next, another embodiment of the tail wheel configuration will be described based on FIG.
A tail wheel support rod 46 is supported on the rear support cylinder 43b of the rear portion of the tillage frame 41 so that the tail wheel support rod 46 can be adjusted up and down, and a tail wheel shaft 45a extends along the left-right direction at the lower end of the tail wheel support rod 46. Left and right tail wheels 45, 45 are pivotally supported at both ends of the wheel shaft 45a. The left and right screw holes 45b and 45b are formed at both ends of the tail wheel shaft 45a, and the left and right screw holes 45b and 45b can be closed by the caps 45c and 45c. Left and right shoulder shaving devices 52, 52 are provided.

  The left and right shoulder shaving devices 52, 52 include a frame 52a that is detachably attached to the rear support cylinder 43b so as to protrude rearward, left and right shoulder shaving plates 52b, 52b located on the left and right sides of the frame 52a, and the tail wheel shaft. Left and right support bodies 52c and 52c for supporting the lower end portions of the left and right shoulder shaving plates 52b and 52b so that the left and right shoulders can be freely adjusted in the left and right screw holes 45b and 45b, and the upper portions of the left and right shoulder shaving plates 52b and 52b on the frame 52a The left and right front support arms 52d and 52d and the left and right rear support arms 52e and 52e are mounted so as to be freely adjustable in the direction of protrusion.

  According to the above configuration, the left and right shoulder shaving plates 52b, 52b are adjusted and attached so as to be in contact with the inclined surface of the ridge, and the vertical tilling operation is performed while the rotary cultivator 8 is reversely cultivated. Then, the left and right tail wheels 45, 45 regulate the rotary tiller 8 to a predetermined tillage depth while traveling behind the tillage transmission case 4, and when the shoulder shaving device 52 subsequently moves, the left and right shoulder shaving plates 52b, 52b The soil on the left and right shoulders of the reed can be scraped off to form a reed with little soil spillage.

  The left and right front support arms 52d and 52d for adjusting the left and right inclination angles of the left and right shoulder shaving plates 52c and 52c adjust the degree of left and right protrusions by the long holes 52e and 52e, and the left and right rear support arms 52e and 52e are plural. Therefore, the left and right shoulder shaving plates 52b and 52b can be firmly adjusted and supported at a predetermined inclination angle while simplifying the adjustment operation.

  Moreover, you may comprise the vertical adjustment apparatus of the resistance bar 44 as shown in FIG. The resistance rod 44 is inserted and supported in the support cylinder 43a of the tilling frame 41 so as to be movable up and down, and the diameter of the resistance rod 44 is made smaller than the diameter of the cylinder of the front support cylinder 43a to facilitate vertical movement. Yes. A vertical adjustment bolt 54a and an adjustment nut 54b are attached to the support cylinder 43a, and a plurality of adjustment recesses 54c,.

  According to the above configuration, by vertically fitting and screwing the tip of the adjustment bolt 54a into the plurality of adjustment recesses 54c,...

Next, another embodiment of the tilling cover 42 of the rotary tiller 8 will be described with reference to FIGS. 17 and 18.
A plate-shaped tillage frame 41 extends rearward from the top of the tillage transmission case 4 to cover the upper center of the rotary tiller 8, and left and right tillage covers 42, 42 are hinged 42a on the left and right sides of the tillage frame 41. ,... Are supported in an open state in which the left and right tillage covers 42 and 42 are rotated upward during the vertical work, and the left and right tillage covers 42 and 42 are rotated downward during the normal flat field work. It is comprised so that it may be in the closed state which covers the right-and-left both sides of the rotary tillage apparatus 8. FIG.

  Left and right rear covers 56, 56 are attached to the rear portions of the left and right tillage covers 42, 42 to cover the left and right rear portions of the rotary tiller 8. Further, the rear portion of the plate-shaped tillage frame 41 extends slightly rearward from the rear end portions of the left and right tillage covers 42, 42, and a leveling plate 57 made of a flexible material such as rubber is suspended from the extending portion. It attaches so that the center part of the rear side of the rotary tiller 8 may be covered, and a pressure plate 58 is attached to the lower part of the leveling plate 57 to press the leveling plate 57 downward. Further, the left and right rear covers 56, 56 and the leveling plate 57 are overlapped left and right in the rear view to prevent scattering of cultivated soil.

  When a tilling operation is performed while normal tilling, there is a case where a portion that rises in the center portion is generated due to the arrangement of the tilling claws 34 of the rotary tiller 8. According to the above configuration, the raised portion at the center can be pressed flat by the leveling plate 57 and the pressure plate 58 to be flat and clean. Further, it is possible to prevent the soil and stones from jumping out to the rear of the central portion of the rotary tiller 8, thereby protecting the operator.

  In FIG. 17, the resistance bar 60 having a configuration indicated by an imaginary line is formed with a halfway refraction portion 60 a. Since the resistance rod is usually formed in a straight line shape, it can be moved up and down along the holder 61 when released from the locking of the holder 61, and collides with the handle when moving up. Yes. Although it is locked to the holder 61 during operation, the locking state is loosened due to loosening of the locking tool 62 or the like, so that the resistance rod may collide with the handle and cause damage or injury due to the push-up action from below. However, when the resistance rod 60 is pushed up and its refracting portion 60a reaches the holder 61, it acts as a stopper and restricts further upward movement. Therefore, the collision with the handle can be prevented.

  FIG. 19 shows an example of a shift lever guide of a field cultivator. In order for the conventional speed change lever a to recognize the mid-speed shift position of the linear guide groove b, a large-diameter dish-like body drop portion c is formed on the guide groove side, and the dish-like body e and the spring f are provided on the speed change lever a side. It was set as the structure which can recognize the position when the plate-shaped object e reaches the depression part c of a guide. However, the number of parts is large and there is a high risk of damage and wear. Therefore, the width of the guide groove 65 is formed larger than the diameter of the speed change lever 67, and a stroke is generated in the vertical direction (direction orthogonal to the linear shift direction) in the middle of the guide groove 65, and the recess 66 is in the middle of the linear shift. Formed. With this configuration, when the shift lever 67 is moved along the straight guide groove 65, when the shift lever 67 is reached, the shift is lowered by the distance α when the shift lever 67 is reached. In the example, it can be determined that the “low speed” position has been reached. Since only the shape of the guide groove 65 needs to be improved, it can be provided at a low cost (FIG. 20).

Side view of a field cultivator Cutting rear view of tillage transmission case Cutting rear view of tillage transmission case Perspective view of tillage nail Cutting rear view of tillage transmission case Rear view of rotary tiller, plan view of part of rotary tiller Side view of the rear of the field cultivator Side view of the rear of the field cultivator Top view of rotary tiller Top view of rotary tiller Side view of a field cultivator Top view of resistance rod and tail wheel Side view of a field cultivator Side view of the field cultivator, cut side view of resistance rod and tail wheel support rod, rear view of rotary tiller Rear view and perspective view of shoulder shaving device Cutting side view of resistance bar Side view of a field cultivator Top view of tillage cover Front view (a) and xx sectional view (b) showing the prior art of the speed change operation unit Front view of the shift operation unit

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tiller 4 Tillage transmission case 32 Left and right tillage shaft 34 Tillage claw 36 Recessed plate claw 36b Recessed portion 36h Plate body claw 36i Tip bent portion 37

Claims (3)

  Left and right tillage shafts (32, 32) that can be switched between forward rotation and reverse rotation are provided at the lower part of the tillage transmission case (4), and the tillage claws (34,. The bending part is attached so that the left and right sides are directed outwardly, and the tilling claw (34,...) Is placed in the right and left positions of the rotating lower side edge in the normal rotation tilling position. The left and right tilling shafts (32, 32) are attached to the left and right tillage shafts (32, 32) with the left and right side surfaces inclined so as to be located inside, and the left and right inside tilling claws (34, ...) are tilted. A rotary tiller characterized in that the angle is configured to be larger than the inclination angle of the left and right outside tilling claws (34, ...).   Left and right tillage shafts (32, 32) that can be switched between forward rotation and reverse rotation are provided at the lower portion of the tillage transmission case (4), and concave plate body claws (near the left and right inner sides of the left and right tillage shafts (32, 32)) 36,...) With the concave portion (36b) facing left and right outside, the concave plate claws (36,...) Are rotated with respect to the ground driving position at the upper edge of the rotation in the normal tillage. Concave portions (36b) are formed so that the position of the lower edge of the soil is shifted inward in the left and right direction, and the nails (37,...) Are provided on the left and right sides of the left and right tillage shafts (32, 32) A rotary tilling device, wherein the tip bending portion (37b) is attached facing left and right outside.   Left and right tillage shafts (32, 32) that can be switched between forward rotation and reverse rotation are provided at the lower portion of the tillage transmission case (4), and plate claws (36h, ...) is attached with its bent end (36i) facing left and right outside, and a plate nail holder (33) is attached to the left and right tillage shafts (32, 32). It is attached so as to incline at a predetermined inclination angle α with respect to a reference plane orthogonal to the plate claw (36h,...), And the tip bend extends from the upper edge in the rotational direction to the middle part in the rotational direction. A bulge portion (36k) that sequentially swells at a predetermined inclination angle β toward the bending direction of the portion (36i), and that sequentially closes the bulge from the midway portion toward the lower edge of the rotation direction; The inclination angle α of the holder (33) is the inclination angle of the plate claws (36h,...). When the plate body claws (37h,...) Are attached to the claw holder (33), the inclination angle β of the plate claws (37h,. A rotary tiller that is attached so as to be along the reference plane of the left and right tillage shafts (32, 32), which is reduced by the inclination angle α of (33).

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