SMALL, BUT PERFECTLY FORMED!Walk-behind self-built eager to make the most versatile. This is understandable: it has to perform a variety of agricultural operations. However, to create a design that is most optimal for any work at the farm, is not easy. So, powerful, heavy duty motor-plow, as a rule, is too broad and clumsy in the aisle, and brisk the tiller can’t beat plowing the dense earth. One solution to this problem is offering our reader from Krasnodar territory Vladimir Yakovlev. Its compact one-wheeled tillers will assist in the processing of the beds, will not damage plants close together and, if necessary, in just 10 minutes will turn into two-wheeled motor-plow.

The main purpose of my walk-behind — inter-row cultivation — has largely determined the peculiarities of its design. It needs to be maneuverable, compact, of a width not exceeding 250 mm. And as the land is located quite far from home, I wanted to make a compact and easy. However, knowing that for deep cultivation a light machine is not enough adhesion with the ground, provided the ability to quickly replace one wheel two.
Kinematic scheme chosen, perhaps, the most common two — stage chain drive: engine — intermediate shaft — drive wheel.
Welded steel corners 32X32 mm the frame is a hard farm. The lateral corners of the upper frame lurching of the motor from a chainsaw “Friendship” with gear. Before him in the bracket of 15X15 mm area of a small fuel tank, and front vertical corner post of the frame supports the intermediate shaft. Bearing chassis shaft mounted on the bolts under the lower longitudinal corners of the frame. And the rear cross member of steel rod of square section is used for hanging work tools.
One-wheeled layout has high requirements for precision placement of nodes on the frame. Thus, the overall center of gravity must be located exactly above the support poverhnostyu wheels. Therefore, several offset wheel axle, the engine is balanced by the additional weight of metal bar suspended in the front part of the frame.
General view of the unicycle of the motor-plow
General view of the unicycle of the motor-plow:
1 — pen, 2 — engine. 3 — fuel tank 4 — intermediate shaft, 5 — counterweight, 6 — frame, 7 — bearing, 8 — wheel, 9 — bracket for mounted implements, 10 — paw cultivator.

Frame (bracket tank not shown).
Frame (bracket tank not shown).
Intermediate shaft
Intermediate shaft:
1 — bearing housing, 2 — leading sprocket Z=10, 3 — retaining bolt M6 4 — an intermediate shaft 5 — locking bolt M10 6 — driven sprocket Z=41, 7 — bearing number 60204.

Control knobs made of steel tube ø 28 mm and is connected to the rigidity of the crossbar.
In the first stage valuable transfer use the sprocket from the moped. Small with Z = 14 is replaced by a sprocket drive saw motor and a large Z = 41 is mounted on the intermediate shaft. Wheel chain transmission chain with a pitch of 19,05 mm also decreasing from the drive sprocket of the intermediate shaft Z = 10 to the wheel with Z = 36.
Intermediate shaft — steel rod ø 30 mm, resting with their shafts in bearings No. 60204. The hubs of both sprockets are rigidly fixed with fixing bolts.
The drive wheel in unicycle form is rubber-coated roller from the serial of the cultivator. It is fixed parallel to the axis 12 of the cleats out of the corner of 20X20 mm, length 90 mm.
Driving wheel (unicycle)
Driving wheel (unicycle):
1 — wheel hub, 2 — shaft, 3 — locking nut bolt (welded to hub), 4 — M10 locking bolt, 5 cover case, 6 — bearing, 7 — elements of fastening of a wheel to the hub, 8 — wheel sprocket Z=36, 9 — bolt lug М6Х70, 10 — rubber wheel 11 — grouser.

Driven axle (two-wheeled)
Driving axle (two-wheeled):
1 — lugs 2 — wheel, 3 — shaft, 4 — key, 5 — cover of bearing housing with felt seal; the rest of the details with balancing option.

Kinematic scheme of transmission
Kinematic scheme of transmission:
1 — engine, 2 — gear (i=3), 3 — sprocket Z=14 from the moped, 4 — circuit, 5 — intermediate shaft 6 — sprocket driven intermediate shaft Z=41 of a motor scooter, 7 — sprocket intermediate shaft Z=10, the pitch of 19,05 mm, 8 — wheel. 9 — wheel sprocket Z=36, the pitch of 19,05 mm.

Wheel hub and sprocket fixed on its axis radial bolts, and because the node can be easily disassembled for replacement of the PA two-wheeled. The wheels in this embodiment are used other: metal, stamped, from agricultural machinery. Lugs from steel corners 25×25 mm and length 100 mm can be welded “Christmas tree” of 16 pieces each. Sprocket on a drive shaft is mounted in the same manner and at the same place, as in unicycle. And wheels using dowels and locking bolts on the shanks. Bearings the drive shaft is installed in closed buildings protected from the mud felt seals. Track walking tractor with two wheels is determined by the drive shaft and can be easily changed. In balancing the widest part of the car was frame — only 225 mm. It is allowed to produce and effectively implement a set of auxiliary attachments for processing the patch. How can harrow after ploughing, to make the furrow of varying depth, Spud beds, loosen narrow rake, opposed to undermine, to carry out various kinds of cultivation, and even to sow and fertilize at a certain depth.

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