JP6721210B2 - Rotary tiller - Google Patents

Description

TECHNICAL FIELD The present invention relates to an agricultural working machine mounted on a tractor for use, and relates to a rotary tilling device for rotating and cultivating a rotary tiller provided with a plurality of tillage claws. More specifically, the present invention relates to a structure that prevents the cultivation soil from adhering to the inner surface of the rotary cover that covers the upper part of the rotary tillage body.

A rotary tiller performs cultivation by rotating a rotary tiller shaft, which is provided with a plurality of tiller claws and is long in the left-right direction, with its left and right end portions rotatably held on a frame. At this time, a rotary cover is provided to cover the upper part of the rotary cultivating body so that the cultivated soil that the plowing claws bounce up may not be scattered upward. A part of the cultivated soil that has been flipped up adheres to the inner peripheral surface of the rotary cover and enlarges, eventually becoming the rotational resistance of the rotating cultivating pawl, causing power loss. For this reason, there is known a structure in which an elastic material or the like is provided on the inner peripheral surface of the rotary cover in order to prevent adhesion and enlargement of the soil on the inner peripheral surface. For example, Japanese Utility Model Laid-Open No. 2-44901 and Japanese Patent Laid-Open No. 2010-284106 are known.

Japanese Utility Model Laid-Open No. 2-44901 JP, 2010-284106, A

In the "cover device for rotary tiller" of Patent Document 1, "a flexible cover body 19 is provided on the inner surface side of the main cover 20 and the cover body 19 is interlocked with the rotation of the rear cover 21 around the horizontal axis. Is a cover device for a rotary cultivator, characterized in that the cover body 19 and the rear cover 21 are connected by an interlocking mechanism 51 so that the cover can be extended and loosened. In the case of Patent Document 1, the interlocking mechanism 51 is connected so as to interlock with the rotation of the rear cover 21, and the cover body 19 is stretched and loosened to prevent attachment of soil, but the structure is complicated and the cover is Since the body 19 is repeatedly stretched and relaxed in the length direction, there is a problem in durability.

The "agricultural work machine" of Patent Document 2 includes "an elastic plate that covers an upper portion of a cultivating body, and a support that partially supports a lower surface of the elastic plate, and at least a part of the elastic plate is It is an agricultural working machine that is movable with respect to the support, and that suppresses damage to the elastic plate due to the entrapment of foreign matter such as stones. The elastic plate is slidable on the support in the front-back direction. It has a structure that has become.

An object of the present invention is to provide a rotary tilling device having a structure that can prevent soil from adhering to the rotary cover with a simple structure.

In order to solve the above problems, the rotary cultivating device according to claim 1, a frame provided with a mounting portion to be mounted on the tractor, and a rotary cultivator provided with a rotary shaft in a horizontal direction orthogonal to the traveling direction in the frame. A rotary tiller provided with a rotary cover provided above the rotary tiller and a leveling plate located behind the rotary tiller and having a front end pivotally supported and a rear end side rotatable up and down. At
The rotary cover has a front end attached to the frame and a rear end side lower surface abutting on the frame, and one end attached to a surface on the rotary cultivator side in the vicinity of an abutting portion on the front side of the corresponding contact portion. The rotary cover is connected and held by an elastic plate that extends rearward and is provided rearward of the abutting portion and is attached to the rear portion of the frame. The rotary tiller according to claim 1, wherein the rotary tiller is inflated and attached , and the rear end side of the rotary cover is rotatable upward .

Further, in the rotary cultivator according to claim 2, the rear end of the elastic plate is located below a rear position of a rotation fulcrum of the grounding plate that rotates up and down. It is a tiller.

According to the present invention, since the front end of the rotary cover is attached to the frame and the lower surface of the rear end portion is in contact with the frame, the cultivated soil is covered by the rotary cover during the cultivating work in which the rotary tiller rotates. Moreover, the rotary cover constantly vibrates and scatters on the elastic plate to suppress the attachment of the tilling soil. In addition, since the elastic plate is attached with a bulge in an arc shape, vibration and deformation occur so that it is lifted upward by the tilling soil scattered on the elastic plate, which vibrates the rotary cover and It has the effect of suppressing soil attachment.

It is a perspective view from the front left in the traveling direction of the rotary tiller of the embodiment of the present invention. It is a traveling direction left side view of the rotary tiller of the Example of this invention. It is a left side sectional view of the rotary direction of the Example of the present invention in the advancing direction.

An embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view of the rotary tiller of the embodiment of the present invention from the front left in the traveling direction, FIG. 2 is a left side view of the rotary tiller of the embodiment of the present invention in the traveling direction, and FIG. 3 is a view of the embodiment of the present invention. It is a cross-sectional view of a left side main part of the rotary tiller in the traveling direction. A three-point link mechanism, which is an ascending/descending link, is provided at the rear of a tractor (not shown) that is a traveling work vehicle, and is connected to a mounting portion 8 at the front part of the frame 2 of the rotary cultivator, so that the rotary cultivator moves up and down. It is freely connected and driven by the power output from the tractor side. In the description, the left side shown in FIG. 2 will be described as the front side in the traveling direction and the right side as the rear side in the traveling direction.

The mounting part 8 is provided in the front center part of the rotary tiller, and is composed of a top link pin 81 in the upper center and a pair of lower link pins 80 located on the left and right below the top link pin 81. The top link and the lower link (not shown) are respectively connected and mounted on the tractor.

An input case 1 is provided at the center of the front mounting portion 8, and an input shaft 10 is provided so as to project toward the front. The input shaft 10 is connected to the output shaft (not shown) of the tractor by a universal joint or the like, and the power on the tractor side is input. A top mast 23 is fixed to the upper surface of the input case 1, and the top link pin 81 is provided at the upper end portion.

A pipe frame 21 formed of a round pipe that integrally projects from the input case 1 to the left and right sides and forms a part of the frame 2 is provided, and the pipe frame 21 on one of the left and right sides (the right side in FIG. 1) is A vertical transmission case 5 extending downward from the projecting end, a vertical support frame 22 extending downward from the projecting end of the other left and right pipe frame 21, and a pipe frame 21. The front frame 24 provided in parallel to the front portion constitutes the main entire frame portion, and the rotor shaft 60 in the left-right direction is rotatably provided between the lower end portion of the transmission case 5 and the lower end portion of the support frame 22. Supports erection.

A large number of tilling claws 61 are radially attached to the rotor shaft 60 at regular intervals to form the rotary tiller 6. The upper part of the rotary cultivator 6 is covered with a rotary cover 7, which prevents the soil cultivated by the rotary cultivator 6 from scattering upward and assists the performance of crushed soil and leveling. In the rear part of the rotary tiller 6, a leveling plate 4 whose front end is rotatably connected to the frame 2 side in the vertical direction is located, and receives the scattering of the soil cultivated by the rotary tiller 6 and at the rear of the leveling plate 4. The area is leveled.

Gauge wheels 20 held by a front frame 24 are provided on the outer side portions of the pair of left and right lower link pins 80, respectively. The gauge wheel 20 grounds on the ground surface to be cultivated and adjusts the height of the rotatable wheel portion to adjust the tilling depth of the rotary tiller 6. The height adjustment is performed by vertically sliding a holder part in which a vertical plate bar-shaped arm holding a wheel is fixed to the front frame 24, and selecting a plurality of fixing holes provided in the holder part and the arm to fix the fixing pin. Adjust the height by inserting it.

The power input from the input shaft 10 of the input case 1 is decelerated by the gear installed in the input case 1 and is output through the pipe frame 21 (right side in FIG. 1) protruding laterally on one of the left and right sides. It is transmitted into the transmission case 5 by the shaft 11. An output sprocket (not shown) is fixed to an end portion of the output shaft 11 in the transmission case 5, and the output sprocket (not shown) is fixed between the end portion of the rotor shaft 60 supported by the lower end portion of the transmission case 5 and the rotor shaft sprocket (not shown). Power is transmitted by a roller chain (not shown) wound around the rotor shaft 60 to rotate the rotor shaft 60.

The support portion of the rotor shaft 60 of the transmission case 5 is rotatably supported by bearings, and is lubricated by the lubricating oil stored in the transmission case 5. An oil supply port is provided in the upper part of the transmission case 5, and the roller chain and the bearing are lubricated by the supplied lubricating oil.

The support portion of the rotor shaft 60 on the support frame 3 side is rotatably supported by a bearing held by the support frame 3 via a bearing retainer (not shown) attached to the support frame 3 with bolts and nuts or the like. There is.

FIG. 3 is a cross-sectional view of a main part as seen from the left side in the traveling direction of the rotary tiller 6 part. In this example, the rotary tiller 6 is rotated counterclockwise in the state of FIG. 3 so that the front side, which is uncultivated land, is downcut. A rotary cover 7 is provided at an upper portion of the rotary cultivating body 6 so as to be spaced apart along the outer peripheral edge of the rotation of the cultivating claw 61. The rotary cover 7 is formed of a thin stainless steel plate or the like, and its front end portion is fastened and connected to the frame 2 by bolts and nuts. The lower surface of the rear end of the rotary cover 7 is in contact with the frame 2 side, and one end of the rotary cover 7 is attached to the surface of the rotary tiller 6 side in the vicinity of the contact portion 73 on the front side of the corresponding contact portion 73. The rotary cover 7 is connected and held by an elastic plate 70 that extends rearward and is provided rearward of the abutting portion 73 and is attached to the rear portion of the frame 2. The elastic plate 70 is a rotary tiller. It is attached by being inflated in an arc shape on the 6 side. The rotary cover 7 is attached to the front frame 25 that is bridged between the transmission case 5 side and the support frame 3 side with cover front mounting screws 74 that are bolts and nuts, and contacts the rear frame 26 that is also bridged. Retained. The rear end side of the rotary cover 7 is connected to the frame 2 side by the elastic plate 70 provided below the contact portion 73. With this structure, the entire rotary cover 7 is likely to vibrate due to the collision of the cultivated soil scattered from the rotary cultivated body 6 side. The front end portion of the rotary cover 7 may be connected by a hinge or the like so that it can rotate more easily.

On the rear side of the rotary cover 7, there is located a leveling plate 4 whose front end is rotatably connected in the vertical direction by a leveling plate rotating shaft 41 provided horizontally on the frame 2 side. The land of the soil is cultivated by the soil and the rear surface of the soil leveling plate 4 is used for leveling. A compression rod 40 is laid over the outer upper surface of the leveling plate 4 and the pipe frame 21 on the front side of the leveling plate 4, and the pressing force of the spring provided on the compression rod 40 is adjusted to adjust the leveling plate 4. The leveling force can be adjusted. The leveling plate 4 is provided over substantially the entire width of the rotary tillage body 6.

The elastic plate 70 provided on the surface of the rear end portion side of the rotary cover 7 on the side of the rotary tillage 6 is made of a plate material such as an elastically deformable synthetic rubber which is more resistant to soil attachment than an iron plate or the like. The front end of the rotary cover 7 is attached to the vicinity of the contact portion 73 on the front side of the contact portion 73 with the frame 2 by bolts and nuts, and the rear end side is located on the rear side of the rear frame 26 behind the contact portion 73. It is fixedly held by the elastic plate rear mounting screw 72. Further, the elastic plate 70 is attached to the rotary tillage 6 side by bulging in an arc shape. Therefore, due to the collision of the tilled soil scattered from the rotary tiller 6 side, the bulging portion deforms or vibrates, and the attachment of the tilled soil is suppressed. Further, since the rotary cover 7 itself to which the elastic plate 70 is connected also vibrates, the structure has a structure in which the plowing soil is less likely to adhere due to the vibration. In this example, the rotary cover 7 is made of a stainless steel plate to which cultivated soil is relatively unlikely to adhere, so that the rotary cover 7 has a structure that is less likely to adhere.

Since the rear end side of the rotary cover 7 is connected by the elastic plate 70 and can rotate upward, when a stone or a foreign matter tries to be caught between the rotary cover 7 and the rotary tiller 6, the rotary cover 7 is rotated. It is possible to prevent the cover 7 from escaping and being caught.

Due to this simple structure, the soil cultivated by the rotary tiller 6 scatters on the rotary cover 7 at the time of work, but the vibrating rotary cover 7 and the elastic plate 70 prevent the soil from adhering, and the soil adhered prevents the rotary tillage. The rotation resistance of the body 6 does not increase to cause power loss.

INDUSTRIAL APPLICABILITY The present invention can be applied to a rotary cultivating device mounted on the rear of a traveling machine such as a tractor to perform cultivating work.

1 Input Case 10 Input Shaft 11 Output Shaft 2 Frame 20 Gauge Wheel 21 Pipe Frame 22 Support Frame 23 Top Mast 24 Front Frame 25 Front Side Frame 26 Rear Side Frame 4 Ground Plate 40 Compression Rod 41 Ground Plate Rotating Shaft 5 Transmission Case 6 Rotary tiller 60 Rotor shaft 61 Tilling pawl 7 Rotary cover 70 Elastic plate 71 Elastic plate front mounting screw 72 Elastic plate rear mounting screw 73 Abutment part 74 Cover front mounting screw 8 Mounting part 80 Lower link pin 81 Top link pin

Claims (2)

A frame provided with a mounting part to be mounted on the tractor,
A rotary cultivator provided with a rotary shaft in the frame in a horizontal direction orthogonal to the traveling direction;
A rotary cover provided above the rotary tillage,
In a rotary cultivating device provided with a leveling plate located at the rear of the rotary cultivating body, the front end of which is axially supported and the rear end of which is vertically rotatable,
The rotary cover has a front end attached to the frame and a rear end side lower surface abutting on the frame, and one end attached to a surface on the rotary cultivator side in the vicinity of an abutting portion on the front side of the corresponding contact portion. The rotary cover is connected and held by an elastic plate that extends rearward and is provided rearward of the abutting portion and is attached to the frame rear portion, and the elastic plate has an arc shape on the rotary cultivator side. The rotary tiller according to claim 1 , wherein the rotary cover is inflated and attached , and a rear end side of the rotary cover is rotatable upward . The rotary tiller according to claim 1, wherein the elastic plate rear end is located below a rear position of a rotation fulcrum of the ground leveling plate that rotates up and down.

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