JP2010124794A - Extended auxiliary leveling plate rotation device of agricultural work vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an expanded auxiliary landing plate rotation device of an agricultural work vehicle, capable of suppressing an increase of cost when changing a synchronization arm damaged or the like. <P>SOLUTION: There is provided a puddling implement 1 having an extended auxiliary leveling plate set freely rotatably around a shaft extending longitudinally, at the end in machine width direction of a second extended leveling plate rotatably supported at the rear end of a first extended leveling plate 24 vertically freely rotatably supported on a shield cover 23 covering the upper part of a tilling rotor freely rotatably supported on a machine body 5. On the shield cover 23, a normal/reverse rotation motor 43, a gear transmission mechanism 47 attached on its axis and a joint 60 attached on a large gear 50 of the output side of the mechanism 47 are set to unitize, and an interlocked arm 53 connected to the joint 60 and rotating accompanied to rotation of the joint 60 is attached on the shield cover 23 separately from unitized normal/reverse rotation motor 43 and the like. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an extension auxiliary leveling plate rotation device for an agricultural machine that rotates an extension auxiliary leveling plate capable of leveling the surface of a farm field flatly over a width wider than a tilling width of a tilling rotor.

  As described in Patent Document 1, a farming machine equipped with such an extended auxiliary leveling plate rotating device is provided with a tiller rotor rotatably on the machine frame and covers the upper part of the tiller rotor on the machine frame. A cover part is provided, arranged on the rear side of the tilling rotor in the direction of travel, a first leveling plate is rotatably provided at the rear end part of the cover part, and a second leveling board is rotated at the rear end part of the first leveling plate It is known that an extended auxiliary leveling plate can be rotated around a shaft portion extending in the front-rear direction at the end of the second leveling plate in the body width direction.

  The extension auxiliary leveling plate rotation device pivotally supports the interlocking arm on a bracket attached to the main frame extending in the body width direction, and connects the extension auxiliary leveling plate to the interlocking arm via the interlocking body. A forward / reverse rotation motor for rotating the interlocking arm is provided on the bracket, and a remote operation switch for controlling the motor is provided in the driver seat of the tractor.

  The interlocking arm is integrally formed with a gear body on the rotation center side, and the gear body is meshed with a pinion that meshes with a worm gear provided in the motor. For this reason, when the motor rotates, the gear body rotates via the worm gear and the pinion, and the interlocking arm rotates about the gear body side as the center of rotation to fold the extended auxiliary leveling plate above the second leveling plate. It can be rotated between the folding position and the unfolded position projecting laterally in the longitudinal direction of the second leveling plate.

Japanese Patent No. 2872530 (paragraphs 0009 to 0017, FIG. 2)

  In this conventional extended auxiliary leveling plate rotating device, if the extended auxiliary leveling plate is rotated to the folding position side while a large amount of mud is placed on the extended auxiliary leveling plate, an overload acts on the interlocking arm. As a result, the interlocking arm may be bent or damaged. In this case, it is uneconomic to replace the interlocking arm having an integrally formed gear body.

  This invention is made in view of such a background, and provides the extension auxiliary leveling board rotation apparatus of the agricultural machine which can suppress an increase in cost, when exchanging interlocking arms which damaged etc. With the goal.

  In order to solve such a problem, the present invention provides a tilling rotor (for example, a tilling rotor 11 ′ in the embodiment) that is rotatably supported by the body, and a cover portion (for example, an upper part of the tilling rotor that is provided on the body and covers the top of the tilling rotor). The shield cover 23 in the embodiment, and a first leveling plate (for example, the first extended leveling plate 24 in the embodiment) disposed on the rear side in the traveling direction of the tilling rotor and supported by the cover portion so as to be rotatable in the vertical direction. ), A second leveling plate (for example, the second extended leveling plate 25 in the embodiment) supported rotatably at the rear end portion of the first leveling plate, and an end of the second leveling plate in the body width direction. In a farm work machine (for example, the skimming work machine 1 in the embodiment) provided with an extended auxiliary leveling plate that is pivotally provided around a shaft part extending in the front-rear direction at the part, forward and reverse provided on the cover part Rotating motor and positive A gear transmission mechanism attached to the rotating shaft of the reverse rotation motor, an interlocking arm that is rotatably supported by the cover portion and rotates by receiving the rotational force from the gear transmission mechanism, an interlocking arm and an extension leveling plate, An auxiliary auxiliary leveling plate rotating device of a farm working machine, wherein the gear on the output side of the gear transmission mechanism (for example, the large gear 50 in the embodiment) A joint that is arranged substantially coaxially with the rotation center axis and that can be rotated along with the rotation of the gear is provided, and the interlocking arm is connected to the joint and rotates along with the rotation of the joint. It is made into a constituent requirement to make it rotate between the folding position folded above the 2nd leveling board, and the expansion | deployment position projected to the side of the longitudinal direction of the 2nd leveling board.

  The forward / reverse rotation motor is provided on the side plate portion covering the side portion of the tilling rotor, the upper portion of the cover portion, or the like. The gear transmission mechanism is configured to include a gear provided on the rotating shaft of the forward / reverse rotation motor on the input side and another gear meshed with the gear. Specifically, the gear transmission mechanism is configured to have a gear ratio that allows the output side gear to decelerate relative to the forward / reverse rotation motor side gear (for example, the small gear 49 in the embodiment). Item 3). The gear ratio is set according to the rotation speed of the extended auxiliary leveling plate.

  The joint has a function of connecting the gear and the interlocking arm to transmit the rotational force of the gear to the interlocking arm. Specifically, the joint is integrally attached to the gear to form a cap shape, and when assembled, the cap-shaped portion is mounted from above the interlocking arm, and the notch provided in the joint is the arm of the interlocking arm. The rotating force of the gear is transmitted to the interlocking arm through the notch. Thus, the gear is provided with a joint, and the interlocking arm is not provided with a gear. For this reason, the structure of the interlocking arm can be simplified, and the cost of the interlocking arm can be reduced.

  The forward / reverse rotation motor, the gear transmission mechanism, and the joint are unitized, and the interlocking arm is provided separately from the unitized forward / reverse rotation motor, the gear transmission mechanism, and the joint. For example, when a unitized forward / reverse rotation motor or the like is provided in the cover portion, the interlocking arm may be the same member as the member provided with the unitized forward / reverse rotation motor or the like or a different member. By installing the interlocking arm separately from the unitized forward / reverse rotation motor, etc., it is not necessary to disassemble the unitized forward / reverse rotation motor, etc. when replacing the interlocking arm, and the interlocking arm replacement work Can be easily performed.

  According to the extension auxiliary leveling plate rotating device for an agricultural machine according to the present invention, the gear on the output side of the gear transmission mechanism is arranged substantially coaxially with the rotation center axis of the gear and rotates with the rotation of the gear. A movable joint is provided, and the interlocking arm is connected to the joint and rotates as the joint rotates, so that the interlocking arm itself is not formed with a gear body that meshes with the gear of the gear transmission mechanism. The structure of the interlocking arm can be simplified, and the cost of the interlocking arm itself can be reduced. For this reason, even if an interlocking arm is damaged and it becomes necessary to replace the interlocking arm, it is possible to provide an extension auxiliary leveling plate rotating device for an agricultural machine that can suppress an increase in cost.

  Hereinafter, preferred embodiments of the present invention will be described with reference to FIGS. First, before explaining the extended auxiliary leveling plate rotating device according to the present invention, a scraping work machine as an example of an agricultural working machine equipped with the extended auxiliary leveling plate rotating device will be described.

  As shown in FIG. 2 (plan view) and FIG. 3 (side view), the scraping work machine 1 has a work machine main body 2 disposed at the center in the left-right direction with respect to the forward direction of the machine, An extension work body 20 that is pivotably mounted in the vertical direction, and a shaft section 21 that extends in the front-rear direction is attached to the lateral outer end of the extension work body 20 so as to be pivotable in the vertical direction. An extension auxiliary leveling plate 30 is provided, and the work machine body 2 and the extension work bodies 20 and 20 form a three-part structure.

  The work machine main body 2 is connected to a front mast 5 having a main frame 3 extending in the left-right direction and a lower mast link to a top mast 4a connected to a three-point link connection mechanism (not shown) provided at the rear of the traveling machine body 90. A portion 4b is provided and is mounted on the rear portion of the traveling machine body 90 so as to be movable up and down. A gear box 6 having an input shaft 6a protruding forward is provided at the center in the left-right direction of the main frame 3, and power is input from the PTO shaft of the traveling machine body 90 through a power transmission means such as a universal joint to the input shaft 6a. To be communicated to.

  A chain transmission case 8 is suspended from the left end of the main frame 3 in the traveling direction, and a side frame 9 is suspended from the right end of the main frame 3 so as to face the chain transmission case 8. A transmission mechanism is provided in the left side of the main frame 3 connected to the chain transmission case 8 and in the chain transmission case 8, and a plurality of tilling claws are attached between the lower ends of the chain transmission case 8 and the side frame 9. A rotor 11 is rotatably provided. The power transmitted to the input shaft 6a is transmitted to the transmission mechanism in the main frame 3 and the chain transmission case 8 via the gear box 6 to rotate the tilling rotor 11 in a predetermined direction. The upper side of the tilling rotor 11 is covered with a shield cover 12, and side covers 13 are provided at both ends of the shield cover 12 in the left-right direction.

  A first leveling plate 15 is attached to the rear end portion of the shield cover 12 so that the front end portion is attached to be rotatable in the vertical direction and the rear side extends obliquely downward. The rear end portion 15a of the first leveling plate 15 is formed in a substantially straight shape in the left-right direction, and the rear end portion 15a flattens the surface of the cultivated soil. A second leveling plate 17 is attached to the rear end portion 15a of the first leveling plate 15 so as to be rotatable in the vertical direction. The 2nd leveling board 17 is formed in plate shape, and leveles the cultivated soil surface flat, the back surface contacting the surface of a farm field. At both left and right ends of the second leveling plate 17, extension working bodies 20 and 20 are provided that are rotatable about the shaft portion 18 as a rotation center.

  The extension working bodies 20 and 20 have a bilaterally symmetric structure. The tilling rotor 11 ′ rotatably supported between a pair of side plates 22 arranged on the left and right sides and a pair of side plates covering the top of the tilling rotor 11 ′. , A first extension leveling plate 24 disposed on the rear side of the tilling rotor 11 ′ in the traveling direction and supported by the shield cover 23 so as to be rotatable in the vertical direction, and a first extension. It has the 2nd extended leveling board 25 supported by the rear-end part of the leveling board 24 so that rotation was possible.

  The 1st extension leveling board 24 is comprised similarly to the 1st leveling board 15, and leveles the cultivated soil surface flatly by the rear-end part 24a of the 1st extension leveling board 24. FIG. The 2nd extension leveling board 25 is comprised similarly to the 2nd leveling board 17 mentioned above, and performs leveling work. The second extension leveling plate 25 is joined and connected to the outer end portion of the second leveling body 17 when the extension work body 20 is deployed, and the outer end of the second leveling body 17 when the second extension leveling plate 25 is folded. The joint with the second leveling body 17 is released away from the part.

  The extension auxiliary leveling plate 30 described above is provided at the outer end of the second extension leveling plate 25. The extension auxiliary leveling plate 30 rotates about the shaft portion 21 extending on the second extension leveling plate 25 as a rotation center, and extends to the outside of the second extension leveling plate 25 in the unfolded state. The ground leveling operation of the main plate 25 is assisted, and when folded (not in use), the ground plate 25 is folded to the surface side of the second extended leveling plate 25 and overlaps the second extended leveling plate 25.

  An extension auxiliary leveling plate rotating device 40 for rotating the extension auxiliary leveling plate 30 is provided on the shield cover 23 of the extension work body 20. As shown in FIG. 1 (partial sectional view) and FIG. 4 (plan view), the extension auxiliary leveling plate rotating device 40 includes a pedestal 41 attached on the shield cover 23 and a forward / reverse provided on the pedestal 41. A rotation motor 43; a gear transmission mechanism 47 attached to the rotation shaft of the forward / reverse rotation motor 43; an interlocking arm 53 rotatably supported on the shield cover 23 facing the base 41; It has the coupling body 57 connected between the extension auxiliary leveling boards 30.

  The pedestal 41 is formed by bending a sheet metal or the like, and includes a flat portion 41a to which a motor or the like is attached and a leg portion 41b that is bent downward from both sides in the width direction of the flat portion 41a and extends downward. The leg portion 41b is detachably mounted on the shield cover 23 with a bolt 41c. The forward / reverse rotation motor 43 has a motor main body 43a in which the rotation shaft of the motor rotates forward and backward by current supplied to the winding. The motor main body 43a decelerates the rotation of the rotation shaft and serves as an output shaft. A speed reduction mechanism 48 forming a part of the transmission gear transmission mechanism 47 is integrally attached.

  The forward / reverse rotation motor 43 is mounted on the flat surface portion 41a of the pedestal 41 via a bracket (not shown) so that the speed reduction mechanism 48 is disposed at the end in the width direction of the flat surface portion 41a. A switch 44 for remote operation is electrically connected to the forward / reverse rotation motor 43, and this switch 44 is disposed near the driver's seat of the traveling machine body 90 (see FIG. 2). Therefore, when the forward / reverse rotation motor 43 is driven by the operation of the switch 44, the interlocking arm 53 can be rotated to rotate the extended auxiliary leveling plate 30.

  The speed reduction mechanism 48 includes a worm gear (not shown) attached to the rotation shaft of the forward / reverse rotation motor 43 and a small gear (pinion) 49 that meshes with the worm gear. The small gear 49 is rotatably supported by the flat portion 41 a and meshes with a large gear 50 having a larger diameter than the small gear 49. The large gear 50 is rotatably supported on the rear side of the flat portion 41a. The attachment structure of the large gear 50 will be described later. That is, the gear transmission mechanism 47 is configured by the worm gear, the small gear 49, and the large gear 50. The gear ratio between the small gear 49 and the large gear 50 is set based on the rotation speed of the forward / reverse rotation motor 43 and the rotation speed of the interlocking arm 53.

  On the lower surface of the large gear 50, a joint 60 that is disposed coaxially with the rotation center axis of the large gear 50 and extends downward is integrally attached by welding or the like. A sleeve 61 supported in a state of passing through the flat portion 41 a is fixed, and the joint 60 is inserted into the sleeve 61 and the lower surface of the large gear 50 is placed on the upper portion of the sleeve 61. The large gear 50 and the joint 60 are supported rotatably with respect to the sleeve 61.

  The joint 60 is formed in a cap shape, and as shown in FIG. 6 (side view), an inverted U-shaped cutout portion 60a through which the arm portion 53a of the interlocking arm 53 passes is provided at the lower portion. The cutout portion 60a is larger than the cross-sectional shape of the arm portion 53a, and a slight gap is formed between the arm portion 53a and the inner surface of the cutout portion 60a in a state where the arm portion 53a is inserted into the cutout portion 60a. It is configured as follows. For this reason, when the forward / reverse rotation motor 43 is driven, the joint 60 decelerated via the small gear 49 and the large gear 50 rotates, and the inner surface of the notch 60 a comes into contact with the arm 53 a of the interlocking arm 53. The interlocking arm 53 is rotated. The shape of the joint 60 is not limited to the cap shape, and may be a cylindrical shape or a rectangular tube shape.

  Thus, the forward / reverse rotation motor 43, the gear transmission mechanism 47, and the joint 60 are integrally attached to the pedestal 41 to form a unit. The unitized forward / reverse rotation motor 43 and the like are covered with a cover 55 having a rectangular shape in plan view as shown in FIG.

  As shown in FIG. 1, the interlocking arm 53 includes a cylindrical rotating portion 53b provided at an end portion, and an arm portion 53a projecting in a substantially horizontal direction from a side surface of the rotating portion 53b. . The rotating part 53b is inserted through a sliding bearing 27 into a shaft part 26 protruding from the shield cover 23 facing the flat part 41a, and is rotatable about the shaft part 26 as a rotation center. The pivot part side of the arm part 53a protruding from the pivot part 53b is inserted into the notch part 60a of the joint 60.

  The shaft portion 26 is provided at a position where it can be inserted into a hole 60b inside the joint 60 provided in the shield cover 23, and the hole 60b of the joint 60 is formed to have a larger diameter than the rotating portion 53b. For this reason, even if the position of the joint 60 is slightly deviated from the shaft portion 26, the joint 60 can be inserted into the shaft portion 26, and the assembly of the extended auxiliary leveling plate rotating device 40 is facilitated. Further, in the drawing, a bolt 63 having a spacer 62 attached to the upper end portion of the shaft portion 26 is attached so as to prevent the rotation portion 53b from being detached from the shaft portion 26, thereby restricting the upward movement of the rotation portion 53b. Yes. Furthermore, the bolt 64 is attached to the flat part 41a of the base 41 so that the shaft part 64a of the bolt 64 protrudes downward from the lower surface of the flat part 41a. The arm portion 53a of the interlocking arm 53 comes into contact with the protruding shaft portion 64a to restrict the counterclockwise rotation of the interlocking arm 53, and the connecting body 57 is attached to the extended auxiliary leveling plate 30 in the folded state. This prevents the situation where an unnecessary load is applied through.

  As shown in FIG. 4 (plan view), one end of a wire as a connecting body 57 is attached to the distal end of the interlocking arm 53, and the other end of the wire is attached to the front end of the extension auxiliary leveling plate 30. It has been.

  As described above, the interlock arm 53 is attached to the same shield cover 23 as the unitized forward / reverse rotation motor 43 and the like, but is provided separately from the unitized forward / reverse rotation motor 43 and the like. .

  When the extended auxiliary leveling plate rotating device 40 configured as described above is provided on the shield cover 23, as shown in FIGS. 1 and 4, the shaft arm 26 protruding from the shield cover 23 is attached to the interlock arm 53. A rotating part 53b is inserted, and a forward / reverse rotation motor 43, a large gear 50 of a gear transmission mechanism 47, and a joint 60 are attached to the base 41 to form a unit, and the unitized forward / reverse rotation motor 43 is shielded. 23 is attached at a predetermined position. At this time, the rotating portion 53 b of the interlocking arm 53 is inserted into the hole 60 b of the joint 60. And the coupling body 57 is connected between the front-end | tip part of the interlocking arm 53, and the extension auxiliary leveling board 30. FIG.

  On the other hand, when removing the interlocking arm 53 from the shaft part 26, the unitized forward / reverse rotation motor 43 and the like are removed from the shield cover 23, the bolt 63 screwed onto the upper part of the shaft part 26 is removed, and the interlocking arm 53 is removed. The rotating portion 53 b is removed from the shaft portion 26.

  Further, when performing the scraping operation with the extended auxiliary leveling plate 30 deployed, the extended working bodies 20 and 20 are set in the deployed posture in the field (see FIG. 2), and the switch 44 of the extended auxiliary leveling plate rotating device 40 is operated. Then, the forward / reverse rotation motor 43 is driven, the joint 60 is rotated clockwise through the gear transmission mechanism 47 (see FIG. 4), and the interlocking arm 53 is rotated to assist extension through the coupling body 57. The leveling plate 30 is rotated to the unfolded state.

  When the entire plowing work machine 1 is in the unfolded posture, the traveling machine body 90 equipped with the plowing work machine 1 is moved forward, and the cultivated soil in the field is cultivated by the cultivating rotors 11 and 11 ′. The field surface is leveled by 17. The cultivated soil surface on the axially outer side of the tilling rotors 11, 11 ′ is leveled by the extended auxiliary leveling plate 30.

  Thus, since the interlocking arm 53 of the extension auxiliary leveling plate rotating device 40 of the present invention is connected to the gear transmission mechanism 47 via the joint 60, the joint 60 is simply pulled out from the rotating portion 53b of the interlocking arm 53. Thus, the connection state with the gear transmission mechanism 47 can be easily released. Further, since the interlocking arm 53 has a simple structure including the rotating part 53b and the arm part 53a, the cost of the interlocking arm 53 itself can be reduced. Therefore, even if the overload or the like acts on the interlocking arm 53 and the interlocking arm 53 is damaged, it can be easily replaced, and the extended auxiliary leveling plate rotating device 40 can suppress an increase in cost. Can be provided.

  In the above-described embodiment, the case where the unitized forward / reverse rotation motor 43 and the interlocking arm 53 are provided on the shield cover 23 has been described, but the attachment positions thereof are not limited thereto. A unitized forward / reverse rotation motor 43 or the like is attached to the main frame 3, the interlocking arm 53 is attached to the shield cover 23, or a unitized forward / reverse rotation motor 43 or the like is attached to the outer end of the extension work body 20 in the width direction. Alternatively, the interlocking arm 53 may be attached to the shield cover 23.

  In the above-described embodiment, as shown in FIG. 1, the interlocking arm 53 inserts the arm portion 53 a of the interlocking arm 53 into the notch 60 a provided in the joint 60 integrated with the large gear 50. Thus, although the case where the large gear 50 and the interlocking arm 53 are connected is shown, the connection between the large gear 50 and the interlocking arm 53 may use a spline shaft and a spline groove into which the spline shaft is fitted. Specifically, as shown in FIG. 7, a cylindrical support portion 67 is integrally attached to the back side of the large gear 50, and the lower side can be fitted into a spline groove 53c formed on the inner surface of the rotating portion 53b. The shaft portion 68 forming the spline shaft 68b is inserted, the portion where the lower spline shaft 68b is formed is inserted into the rotating portion 53b, and the large gear 50 and the interlocking arm 53 are connected via the shaft portion 68. You may connect.

  Further, in the above-described embodiment, the scraping work machine 1 having a structure in which the extension work body 20 can be folded with respect to the work machine body 2 is taken as an example. However, the extension work body 20 is eliminated and the width direction end portion of the work machine body 2 is removed. Alternatively, an auxiliary auxiliary leveling plate 30 may be pivotally attached.

It is a partial cross-section rear view of the extension auxiliary leveling plate rotating device of the present invention mounted on the scraper working machine. It is a top view of the scraping work machine carrying the extension auxiliary leveling board rotation device of the present invention. It is a side view of the scraping work machine which carries the extension auxiliary leveling board rotation device of the present invention. The top view of the state which the inside of the extension auxiliary leveling board rotation apparatus of this invention mounted in the scratching work machine was exposed is shown. The top view of the extension auxiliary leveling board rotation apparatus of this invention mounted in the scratching work machine is shown. It is a side view of the extension auxiliary leveling board rotation device of the present invention mounted in the scraper working machine. It is a partial cross section rear view of the extension auxiliary leveling board rotation apparatus of other embodiment of this invention.

Explanation of symbols

1st scratching machine (agricultural machine)
5 Airframe 11 'Tillage rotor 21 Shaft part 23 Shield cover (cover part)
24 First extension leveling board (first leveling board)
25 Second extension leveling board (second leveling board)
30 Extension auxiliary leveling plate 40 Extension auxiliary leveling plate rotating device 43 Forward / reverse rotation motor 47 Gear transmission mechanism 49 Small gear (gear)
50 Large gear (gear)
53 Interlocking arm 57 Linked body 60 Joint

Claims (3)

A tilling rotor that is rotatably supported by the body, a cover part that is provided on the body and covers an upper part of the tilling rotor, and is arranged on the rear side in the advancing direction of the tilling rotor and is rotatable up and down on the cover part. The first leveling plate supported by the first leveling plate, the second leveling plate rotatably supported by the rear end portion of the first leveling plate, and the front end of the second leveling plate extending in the front-rear direction. Agricultural work machine including an extended auxiliary leveling plate provided rotatably about a shaft portion as a rotation center, and attached to a forward / reverse rotation motor provided on the cover portion and a rotation shaft of the forward / reverse rotation motor. Connected between the interlocking arm and the extension auxiliary leveling plate, the interlocking arm that is rotatably supported by the cover portion and rotates by receiving the rotational force from the gear transmission mechanism, Extension auxiliary leveling board for agricultural machines with a connected body An apparatus,
The output gear of the gear transmission mechanism is provided with a joint that is arranged substantially coaxially with the rotation center axis of the gear and is rotatable with the rotation of the gear,
The interlocking arm is connected to the joint and rotates as the joint rotates, and a folding position where the extended auxiliary leveling plate is folded above the second leveling plate and a longitudinal direction of the second leveling plate An auxiliary auxiliary leveling plate rotating device for an agricultural machine, wherein the extended auxiliary leveling plate rotating device is configured to rotate between an unfolded position projecting laterally. The forward / reverse rotation motor, the gear transmission mechanism, and the joint are unitized,
The extended auxiliary leveling plate for agricultural machinery according to claim 1, wherein the interlocking arm is provided separately from the unitized motor for forward / reverse rotation, the gear transmission mechanism, and the joint. Rotating device.   3. The gear transmission mechanism according to claim 1, wherein the gear transmission mechanism is configured to have a gear ratio capable of decelerating the output-side gear with respect to the forward-reverse rotating motor-side gear. Extension auxiliary leveling plate rotation device for agricultural machines.

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