Motoblock Siberian. Drawing, description

TOOLS AND MECHANISMS FOR AGRICULTURE
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Motoblock Siberian. Drawing, description

Tools and mechanisms for agriculture

Directory / Tools and mechanisms for agriculture

Ease of manufacture and maintenance, reliability, versatility - these are the qualities that I wanted to achieve by making a walk-behind tractor. Now, after two years of operation in the subsidiary farm, I can say that the goal has been achieved: the machine has become an indispensable assistant - with a set of attachments, the walk-behind tractor is used for plowing, cultivating, hilling, harrowing, and in winter - for clearing paths from snow. Coupled with a single-axle bogie equipped with a wooden body and a driver's seat, a self-propelled chassis with a load capacity of up to 200 kg is obtained.

The frame of the walk-behind tractor is welded from steel pipes of square and rectangular section. Its spars are two meter-long sections with a section of 42x42x3 mm. Transverse beams 230 mm long and 30x30x3 mm in section are welded to their ends. The frame is reinforced with a central cross member. Next to it - under the spars - two bridge supports are welded from sections of a rectangular pipe 45x20x3 mm.

The engine and fuel tank are supported by a U-shaped bracket 40 mm wide bent from a thick steel strip,

Rice. 1. Motoblock "Sibiryak-3" (click to enlarge)

The engine of the chainsaw "Ural MP-5" with a power of 5 liters was used as a power unit. ". A bevel gearbox from the Druzhba chainsaw is connected to the crankcase. Through the Z1 sprocket (16 teeth) and the chain (12,7 mm pitch) installed on the output shaft of the gearbox, the torque is transmitted to the sprocket 1-2 of the input shaft of the gearbox from the scooter " Vyatka".

This arrangement of units may seem unnecessarily complicated. Indeed, it would be easier to use an engine from a scooter assembled with a box, but I chose this option based on the availability of parts and assemblies.

Motoblock Siberian
Rice. 2. Kinematic diagram of the walk-behind tractor: 1 - axle bearings No. 205, 2 - axle shaft, 3 - axle gearbox output shaft, 4 - bridge gearbox, 5 - drive axle sprocket, 6 - chain, 7 - gearbox output shaft sprocket, 8 - gearbox, 9 - sprocket of the input shaft of the non-robust, 10 - chain, 11 - sprocket of the engine gearbox, 12 - bevel gear from the Druzhba chainsaw 13 - engine

Since the engine is quite high-revving and three gears in the gearbox is not enough, it is possible to replace the input gear sprocket to get the necessary speed range for plowing and transport operations. When installing an asterisk with 36 teeth, we get a transmission with high torque, and with 16 teeth, a faster one, providing a maximum speed of the walk-behind tractor up to 20 km / h.

So that when replacing a large sprocket with a small chain, it does not sag, the transmission has a tension sprocket, the axis of which can be moved in the groove of the spar.

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Fig 3. Motoblock frame: 1 - transverse Salka, pipe 30x30x3 mm. 2 - spar, pipe 42x42x3 mm, 3 - central cross member, pipe 45x20x3 mm. 4 - bridge support, pipe 45x20x3 we. 5 - vertical guide of the trailer bracket, pipe 42x20x3 mm, 6 step-ladder for fastening the trailer bracket, steel bar d10 mm, 7 - longitudinal beam of the trailer bracket, pipe 42x42x3 mm, 8 - groove for fastening the axis of the tension sprocket.

The output sprocket of the gearbox (15 teeth) is connected by a chain (pitch 19,05 mm) with the sprocket (11 teeth) of the rear gearbox from the cargo motor scooter TGA-200 "Ant".

To ensure a rigid dependent wheel suspension, a number of improvements had to be made. Two semi-axes are machined from a steel bar, and the bearing journal is given a size that provides a fit) of the inner ring of the bearing with an interference fit. This is necessary to prevent axial displacement of the axle shafts. Then, at one end of each axle shaft, a splined coupling is welded, and on the other, after installing the ring under the protective seal, a wheel hub. These parts can be used from the "Ant" axle shafts

Motoblock Siberian
Rice. 4. Engine mounting bracket

The bearing body of the axle shaft is made of a thick-walled steel pipe with an outer diameter of at least 60 mm and a length of 220 mm. With one and; sides, a hole d 52 mm is bored, designed for two) ball bearings No. 205, and a groove for fixing them with a spring ring. It will protect the bearing) from dirt and keep grease in them with an O-ring made of a thick felt sheet installed between two steel plates. The other end of the housing is welded into the flange, which is bolted to the axle housing. Thus, the gearbox housing with the axle shaft housings as an assembly forms a rigid bearing bridge. It is firmly fixed on the frame with four bolts passed through the holes of the frame side members, as well as with two ladders pressing the ends of the axle housings to the support brackets.

Wheels from a scooter are mounted on the studs of the axle hubs. Their discs are asymmetrical, which allows you to change the track: 500 mm for row spacing and 650 mm for transport work.

Rice. 5. Axle assembly

You can increase traction with simple lugs made from a used grain combine elevator chain with the scrapers removed. The chain is connected into a ring according to the size of the outer diameter of the lowered wheel. Having placed it in the middle of the treadmill, we inflate the tire - the lugs will firmly sit on the tire.

All control of the walk-behind tractor units is arranged on the steering wheel - two steel pipes d 22-25 mm bent according to the height of the driver, bolted to the frame spars. Here are the levers for the carburetor throttle, clutch release, gear shift, axle reverse, as well as the engine stop button.

To reduce vibration loads, all units of the power plant, except for the drive axle, are mounted on the frame through rubber gaskets.

Attachments can be very diverse - based on the specific purpose and operating conditions, but the traction characteristics of the walk-behind tractor make it possible to use a single-leaf plow, cultivators and hillers in two rows, a tooth harrow 80 cm wide and a bulldozer blade about 70 cm wide.

Motoblock Siberian
Rice. 6. Installation of the rear axle: 1 - longitudinal frame spar, 2 - bolt for fastening the crankcase of the drive axle gearbox, 3 - spacer bushings.

To perform a variety of transport operations, the walk-behind tractor is connected to a single-axle bogie. On its welded steel profile frame, a spacious wooden body, a driver's seat and a swivel hitch are fixed, providing vertical rigidity of the connection. Wheels with brake drums (from the "Ant") are equipped with mechanical brakes controlled by a pedal from the driver's seat.

I think that the possibilities of the machine have not yet been exhausted. Work on its improvement continues. So, for example, I decided to make a power take-off shaft in order to use the engine to drive all kinds of mounted and trailed implements.

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