JPH0449961B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Subject of the Invention...Field of Industrial Application) The present invention relates to a tilling device that is connected to the rear part of a tractor so as to be movable up and down, for example via a three-point support link mechanism, In particular, the tilling section is equipped with a disc rotor, which is made up of multiple discs (discs with curvature) attached to a rotating shaft at predetermined pitches, which is pivoted around the main frame at the center of the device so that the gearing angle can be adjusted to the left and right. and then connect this to the tractor.
This relates to a disc-type rotary tiller that is rotationally driven by the power transmitted from the PTO shaft.In particular, the disc rotor is made into a frame shape by its constituent members, so that it can resist the resistance load applied during tilling work. The present invention relates to a disc-type rotary tilling device constructed.

(Prior Art) Conventionally, as a disc-type rotary tiller in which a disc is forcibly driven to rotate, the one described in British Patent No. 857923 has been known for a long time, and recently, the one described in Utility Model Application Publication No. 57-54201 has been known. The method described in the official gazette has also been proposed in Japan.

In this type of tillage device, disc rotors extending left and right are arranged symmetrically with a central transmission part as a boundary, and by rotating the left and right disc rotors back and forth in a horizontal plane with respect to the direction of travel. In addition to being pivotally supported so that the gearing angle can be adjusted, the left and right disc rotors are forcibly driven to rotate by power transmission from the tractor PTO shaft via a universal joint. By arranging the soil inwards or outwards, the soil is turned over into a high ridge shape or a broken ridge shape, and the soil is tilled.

(Technical Problem of the Present Invention) In the above-mentioned tilling device, each of the disks constituting the left and right disk rotors is arranged so that the concave curved surface faces inward. Of course, these drive shafts and frames are subject to stresses such as tension, compression, and torsion due to the tilling resistance that occurs when towed by a tractor, so they require considerable strength.

However, if all the strength required for the device is expected to be provided by a single component, the weight of the device will increase, which is undesirable because it will cause an increase in the product price.

(Objective of the present invention) In order to solve the above-mentioned problems, the present invention does not need to increase the mechanical strength of each constituent member of the device, but rather improves the mechanical strength of the device as a whole by making improvements to the structure. In particular, the disc rotor creates the most resistance during tilling work.
Reinforcement measures are most needed, and the aim is to rationally improve the strength of these areas.

(Technical Means of the Present Invention) For this purpose, the present invention specifically constructs a frame structure with high rigidity from each constituent member such as the day rotor, transmission case, rotor shaft, and rotor frame, and the entire disk rotor is The structure is characterized in that the structure is sufficiently durable without having to increase the strength by bearing the stress generated during tilling work and increasing the weight.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In the figure, reference numeral 1 denotes the main frame of the main body of the tilling device, which has two rows of vertical bars 11, 12 and horizontal bars 13, 1 long in the front and back direction at the center of the width direction of the device.
The framework is based on 4. This main frame 1 has a transmission part (transmission box 2) fixedly installed in the middle part in the front and back direction, spanning between the left and right vertical bars 11 and 12, and this transmission box 2 has an input shaft 21 on the front side. This is installed at the rear of the tractor A via the drive shaft 22 as seen in well-known tractor-mounted agricultural machines.
It is transmission connected to the PTO shaft 23 to receive power transmission from the tractor. Furthermore, the main frame 1 has a strut 15 erected at its front end, and includes a top link 16 connected to the top of the strut 15, and two left and right lower links 17 connected to both sides of the lower part. The main frame 1 is connected to the tractor A through a three-point support linkage mechanism.
It is connected to the rear part of the vehicle so that it can be raised and lowered.

Disc rotors 3, 3 are arranged on both left and right sides of the main frame 1 as the center. The left and right disk rotors 3 are each made up of a plurality of disks 32 (three in the illustrated embodiment) attached at a predetermined pitch to a horizontally supported rotor shaft 31. The disks 32 are mounted symmetrically so that their curved concave surfaces face inward, and the left and right disk rotors 3 are fixed to a rotor frame 33 at the end of the rotor frame 33. A transmission case 36 (described later), a rotor shaft 31 to which a disk 32 is attached and whose end is supported by a bearing (not shown) of the transmission case 36, and the other end of the rotor shaft 31 connected to the rotor frame 33
By supporting a bearing 33b provided on a support member 33a hanging from the support member 33a, the overall structure has a rectangular frame structure, in other words, a frame-shaped structure. The left and right rotor frames 33 are pivoted at their inner ends to the vertical bars 11 and 12 of the main frame 1 by vertical pins 34, and each rotor frame 33 is moved in a horizontal plane using the vertical pins 34 as fulcrums. It is supported so as to be able to swing back and forth, thereby allowing the gearing angle of the left and right disc rotors 3, 3 to be adjusted.

In order to adjust the gearing angle, the left and right rotor frames 33 each have one end 35a of the interlocking rod 35.
The other end 35 of this interlocking rod 35
b is pivoted and connected to a sliding body 4 supported at the rear of the main frame 1 so as to be slidable back and forth. The base end of a hydraulic cylinder 5 that accommodates a piston rod 51 whose base end is pivotally connected to the horizontal bar 14 between the left and right vertical bars 11 and 12 of the main frame 1 is connected to the sliding body 4, and the hydraulic cylinder 5 expands and contracts. The sliding body 4 is made to slide back and forth along the vertical bars 11 and 12 of the main frame 1 by the operation, and this hydraulic cylinder 5
A hydraulic motor 6 operates the transmission box 2 between the left and right vertical bars 11 and 12 of the main frame 1.
It is mounted in a blind space formed under the transmission box 2 and is driven from the input shaft 21 of the transmission box 2 via a belt transmission system 24.

The transmission box 2 has output shafts (not shown) that protrude in the left-right direction, and a power transmission shaft 26 connected to each output shaft via a universal joint 25 extends laterally along the rotor frame 33. The other end is connected via a universal joint to a chain wheel shaft in a transmission case 36 formed on the outer end side of the rotor frame 33, so that transmission can be performed to a side transmission system such as a chain. A rotor shaft 31 of the disc rotor 3 is connected to a chain wheel shaft disposed at the lower end of the side transmission system, so that rotational power is transmitted. The power transmission shaft 26 has a structure in which the shaft portion is extendable and retractable, and the disc rotor 3 is designed to rotate at a high speed (approximately 3.5 times or more speed) relative to the working speed of the tractor (rotation speed of the disc). It is set as.

The left and right rotor frames 33 have supporting arms 37 extending forward from the respective rotor frames.
is protruded so as to be able to swing from side to side around a vertical pin 38, and at the front end of each support arm 37, a column 71 having a stabilizing wheel 7 pivotally supported at its lower end is attached so as to be able to adjust its vertical position. By adjusting the stabilizing wheel 7 up and down, the depth of plowing by the disc rotor 3 can be regulated. However, stability wheel 7
Each support arm 37 that supports the stabilizing wheel 7 is connected to its respective rotor frame so that it always rotates around an axis perpendicular to the traveling direction without being affected by the gearing angle adjustment of the left and right disc rotors 3, 3. It is connected to the vertical bars 11 and 12 of the main frame 1 via a parallel link 39 arranged parallel to the main frame 1 .

A central tillage processing mechanism 8 is provided at the front of the inner end sides of the left and right disc rotors 3, 3 configured as described above. This central tillage processing mechanism 8 pivots a pair of left and right disks 81, 81 in a V-shaped plane so that their curved concave surfaces face outward and their circumferential front portions approach each other in the direction of travel. In particular, in the present invention, the base end of the support arm 83 that cantilever supports each support shaft 82 of the pair of disks 81 is attached to the lower front end of the main frame 1 via a vertical pin 84. The left and right disks 81, 81 are pivotably supported so as to be able to move toward or away from each other using the vertical pin 84 as a fulcrum, and each support arm 83 has an elastic Both disks 81, 8 are connected by the body 85.
1 are elastically biased in the direction of opening each other. This elastic body 85 extends in the front-rear direction sandwiching the pivot position of the vertical pin 84, and its rear end is fixed to the main frame 1 side, and its front end is in contact with the inner surface of the support arm 83 as a free end. This elastic body 85
The spring force is such that it has an opening force necessary to at least open the pair of left and right disks 81, 81 via the support arm 83 to form an opening distance between them that is equal to or larger than the shaft diameter of the drive shaft 22. It is set. In the figure, reference numeral 86 indicates a stopper for regulating the opening interval, and reference numeral 87 indicates a chisel located between the left and right disk rotors 3, 3 behind the central tillage processing mechanism 8, and suspended from the crossbar.

In such a configuration, when the tractor A is moved forward to perform plowing work, the power transmitted from the PTO shaft 23 of the tractor via the drive shaft 22 causes the left and right disc rotors 3 to adjust to the working speed of the tractor. The soil is rotated at a higher speed than the (disk rotation speed), and the soil is turned inward by the disks 32 of each disk rotor 3, 3 that is rotationally driven, and the soil is plowed into a high ridge shape (scythe shape). Prior to reversing and tilling by the left and right disc rotors 3, 3, a pair of left and right discs 8 constituting the central tillage processing mechanism 8
1 and 81 are cut into the uncultivated land in front of the middle part of both disc rotors 3 and 3, and the soil in the center part is tilled horizontally by the rotation of the discs 81 and 81.

At this time, the left and right pair of disks 81, 81 receive inward side pressure from each other due to the tilling resistance caused by the forward movement, so both disks 81, 81 press their respective elastic bodies 85, and the circumferential front portions of the disks 81, 81 are A pair of disks 81, 81 are placed in close contact with each other on their backs, and the gap between both disks 81, 81 is closed, so that the soil in the center can be tilled so as to be distributed to the left and right by a pair of disks 81, 81 arranged in a V-shape. In this way, there is no uncultivated land (remaining tillage) in the central part, and the soil in the central part is distributed to the left and right and divided in the middle, so that the subsequent left and right disc rotors 3, 3
The soil will be turned over and plowed more accurately.

Furthermore, when the tilling device is lifted upward when going around the furrow, etc., when the central tilling processing mechanism 8 is pulled up to the ground as the tilling device rises, the tilling resistance acting on the pair of left and right disks 81, 81 is eliminated. Therefore, both disks 81, 81
are opened to the left and right by the spring force of the elastic body 85, and a gap larger than the shaft diameter of the drive shaft 22 is formed between the two disks 81, 81. Due to the formation of this gap, the central tilling disks 81, 81 teeth,
drive shaft 22 without interfering with the drive shaft 22 disposed longitudinally above it.
passes through the gap and the tiller can be lifted high above the ground.

In particular, the disk rotor 3 is attached to the rotor frame 3.
3, a transmission case 36 fixed to the end thereof,
Furthermore, since the rotor shaft 31 has one end pivotally supported by the transmission case 36 and the support member 33a supports the other end of the rotor shaft 31, it has a frame-shaped structure, so that it can be easily used during tilling work. It can sufficiently resist the applied load.

(Effects of the present invention) Thus, according to the present invention, the rotor frame and
A frame-shaped structure is formed by a transmission case connected to an end of the rotor frame, a support member extending from the rotor frame in parallel with the transmission case, and a rotor shaft mounted between the support member and the transmission case. Because the disc rotor is constructed, it has sufficient rigidity and strength against the loads and loads received during tilling work.

[Brief explanation of the drawing]

The accompanying drawings show an embodiment of the disc type rotary tiller according to the present invention, in which Fig. 1 is a slope view seen from the rear, Fig. 2 is a plan view of the same, Fig. 3 is a partially cutaway side view, and Fig. 4 is a partially cutaway side view. The figure is a rear view in the direction of the arrow in FIG. 2. 1... Main frame, 11, 12... Vertical frame, 1
3, 14...Horizontal beam, 15...Strut, 16...
...Top link, 17...Lower link, 2...
Transmission box, 21... Input shaft, 22... Drive shaft, 23... PTO shaft, 24... Belt transmission system (hydraulic drive), 25... Universal joint, 26... Power transmission shaft, 3... Disk Rotor, 31...Rotor shaft, 32...Disc, 3
3... Rotor frame, 33a... Support member, 3
3b... Bearing, 34... Vertical pin, 35... Interlocking rod, 36... Transmission case, 37... Support arm, 38
... Vertical pin, 39 ... Parallel link, 4 ... Sliding body, 5 ... Hydraulic cylinder, 51 ... Piston rod, 6 ... Hydraulic motor, 7 ... Stable wheel, 71 ...
Pillar, 8... Central tillage processing mechanism, 81... Disk, 82... Support shaft, 83... Support arm, 84...
...Vertical pin, 85...Elastic body, 86...Regulation stopper, 87...Chisel.

Claims (1)

[Claims] 1 A tilling device that is connected to the rear of a tractor so that it can be raised and lowered via a link mechanism, and a power transmission section that receives power transmission from the PTO shaft of the tractor via a drive shaft is provided on the main frame at the center of the device, and the above-mentioned A pair of left and right disk rotors are provided on both sides of the main frame, each consisting of a plurality of disks attached to a rotating shaft at a predetermined pitch.
The left and right disc rotors are configured to be rotationally driven from the transmission unit via a power transmission system, and the disc rotor includes a rotor frame, a transmission case connected to an end of the rotor frame, and a transmission case connected to the end of the rotor frame. A disc-type rotary tiller characterized in that it has a frame-shaped structure including a support member extending parallel to the transmission case and a rotor shaft installed between the transmission case and the lower end of the support member.