BRISK, WHEEL, REVERSE

BRISK, WHEEL, REVERSE

To the tinkerers, to engage in farming consider themselves not the first year. As a regular reader of “Modeller-designer”, produced (with the help of coffee design) mower, mini moped for transportation of hay, all-terrain vehicle on the tires, several power tillers and mini tractors. Best believe your homemade design, which is readily repeated by neighbors and never failed. It’s the stand on the court readers. Of course, this is a laborer-tractor. With minimal dimensions, nimble; equipped with reverse-reducer, which I have already told (with the app sketches, and other materials) in the pages of the eleventh issue of the magazine for the year 1989.
On the kinematics of the transmission, I remember, had to suffer before he found a rather simple (see Fig.) and acceptable to the existing “material base” solution. The same can be said about the layout. Although certain components of the design turned out too heavy-squat, but the margin of safety is not deprived. Mini tractor (in the future I will call him MT) working safely and transporting cargo weighing up to one ton, and hay (trailed mounted mower), and plowing, and when cutting grooves. Moreover, while plowing is used (depending on the severity of the soil), or second, or third speed. And they are great. A normal horse plow, as it turned out, there is almost unacceptable, so I had to make seeu: slightly larger in size, with elongated toe shield and a smaller twist of the blade (see Fig.).
The supporting basis of the whole structure of MT is its frame. Without welding this, of course, is not to be done. Increased strength and give the channel side members and cross member bracket 5 of the front axle (of the same steel channel 16), and the gusset plate of 5 mm St3, and welded “turn” the steering column bracket. And, of course, the rear axle. Rigidly attached to the spars steel 8 mm plates, strapped on the eight M10 bolts with nuts, “zakonchennyi” washers, it is like a logical continuation and completion of the welded frame.
 
Rear axle of the car GAZ-21 “Volga”, a shortened (trimmed) to width (flange axle) 800 mm (according to the method, largely similar to what published in number 2 of the magazine in 1993). Let me just note that the rivet heads fixing the stockings, was cut down. The remaining part is pushed inside of the stocking.
 
Mini-tractor
 
Mini tractor (lighting equipments conventionally not shown):
1 — front wheel driven with a pneumatic tire and a 5.0—10″ (2 PCs.), 2 — line steering (motorized SZA), 3 — unit power (motorized SZA), 4 — hood of turning a homemade, 5 — steering column (from the GAZ-21 “Volga”), 6 — wheel steering with the handle “ball” (from the loader), 7 — the lever is “reverse”, 8 — lift lever hinged frame (latching, bus LiAZ), 9 — the levers (right and left) including brakes, 10 — gas tank bracket (2 PCs), 11 — seat 12 — tank 13 — wing peligrosamente (2 PCs), 14 — raising mechanism for the hinged frame (lever), 15 — plate installation of mounted implements, 16 — the body of the plough, 17 — blade, 18 — Board field, 19 — blade with an elongated toe, 20 — leading rear wheel with pneumatic tyre 6,5—20″ (2 PCs.) 21 — reverse gear homemade (description and sketches of designs, see No. 1Г89), 22 — frame MT, 23 — steering mechanism (from the GAZ-21 “Volga”), 24 — transmission power circuit PR-19,05 (from discarded agricultural machinery), 25 — pedal “grip”, 26 — a panel instrument, 27 the lever, kickstarter, 28 — pedal “gas”, 29 — cylinder hydraulic brakes main, 30 — a box tool, 31 — frame is hinged, 32 — support weld hoist frame hinged, 33—., 34 — a towing device, 35 — axle rear (from the car GAZ-21 “Volga”, cropped), 36 — fry steering, 37 — bracket gearbox.
 
SPECIFICATIONS MINI TRACTOR
 
Dimensions (with raised hinged frame), mm……………….. 1900x1050x1350
Base, mm ………………………………………………………………………1250
The track of the rear axle, mm……………………………. ……………950
Ground clearance, mm…………………………………………………..350
Weight (without.trailers and mounted implements), kg …………………….400
Engine ……………………………………………………………………..from motobayashi SZA
Features of kinematics ……………………………………………….the presence of reverse-reduction gear
The maximum transport speed, km/h …………………..30
Operating speed during plowing, km/h…………………………4
Plowing depth max, mm……………………………….300

 
Kinematic scheme of transmission
 
Kinematic scheme of transmission:
1 — front wheel driven (motorized cover, 2 PCs.), 2 — the unit of power (motorized SZA), 3 — power transmission chain PR-19,05 (from discarded farm equipment), 4 — reverse gear homemade (description of the design and sketches of the main parts and assemblies, see No. 1Г89), 5 — gimbal transmission, 6 — axle rear (from the car GAZ-21 “Volga”, cropped), 7 — rear wheel driving (tractor M GZ-52, 2 pieces).
 
 
Frame MT weldment
 
Frame MT weldment (mounting holes — for installation site-specific at the disposal of samodelka, components and parts):
1—plate is mounted on a rear axle to the headstock (8-mm STZ, 2), 2 — longeron (welded from pieces of steel channel steel 16 light weight, 2 pieces), 3 — step (8-mm STZ, 2 PCs.), 4 — Klondike solitaire (5 mm STZ, 4-piece), 5 — crossmember frame bracket, axle front (from the segment of the channel 16 lightweight steel), 6 — bushing warna (20 mm STZ, 2), 7 — steering column bracket (strip of STZ-section 8×70 mm).

 
 
Bracket gearbox
 
Bracket gearbox (welded construction of 8-mm STZ):
1 — front cross (2 PCs.), 2 — base (2 PCs.).
 
Polik
Polik
 

Raspressovki hose from the crankcase a reducer of the rear bridge was done pretty easily, using special mandrels and… sledgehammer. Stockings were protocells to ready the bridge had different lengths of axle shafts and how you can better fuse with the reverse gear (also, incidentally, shifted to the left, when viewed in the direction of movement of MT in normal mode). Because it allows to reduce the fracture of the gimbal and increase the load on the left rear wheel when plowing. No need to install additional counterweights, tractor sustained in the furrow.
 
But I continue to finalize the rear axle. The holes remaining after rivet, threaded M12 for fixing cropped stockings.
When performing complex of works on such meat was once welded and the brackets under the mounting and plate fixing it to the frame. And to the axle housing by means of welded gusset plate mount headlight-COP, a shaft housing of the lift linkage.
 
Hinged frame — welded construction. Made from sections of steel channel and steel corners № 8 with gussets and strengthening plates. Latest — of 5 mm STZ. There is on the frame and 2 ears (earrings 8 mm St3). Brackets hinge this frame is mounted movably (see Fig.). Korobosea part of it is used for installation of attachments. This may be a plow, Hillers, and rakes, and cultivators.
 
Joining the rear axle to the main units and details of MT
 
Joining the rear axle to the main units and details MT:
1 — the headstock homemade (STZ, 2), 2 — axle rear (from the car GAZ-21 “Volga”, cropped), 3 — frame rails of the MT 4 — gear propeller (prop shaft shortened), 5 — shaft output gearbox, 6 — pole weld mechanism for lifting the hinged frame (from discarded farm equipment).
 
 
Hinged frame (welded construction)
 
Hinged frame (welded construction):
1 — beam of fastening of attachments (cut from square tube 50×5 or coroborate welded two steel angles № 8), 2 — lug (stud earring 8 mm STZ, 2), 3 — solitaire (5-mm St3, 2), 4 — spar (the length of the channel 8 steel, 2 PCs.), 5 — plate gain (5 mm STZ, 2 PCs.).

 

 
Structural features of the manufacture of the front axle
 
Structural features of the manufacture of the front axle:
I — hub axis of the front wheel (Steel 45,2 PCs.), 2 — cover bearing unit (STZ, 2), 3 — ball bearing 206 (4 PCs), 4 — bushing, support-rotating strut (120-mm pipe cut 70×14, 2 PCs.), 5 — lever steering linkage (2 PCs), 6 — pin 0 to 30 mm slotted end (from discarded farm machinery, 2 piece), 7 — cross frames — bracket front axle 8 — node two bearing 2507 war-Noah, 9 — axis-M30 bolt, 10 nut MLO,
 
II — washer grower 12 — beam front axle (cut from square pipe 65×5 or coroborate welded two steel angles № 6,3).

 
Lifting and lowering of all of this is made with a compact and reliable system of levers. Moreover, the lift lever hinged frame with the locking “dog”. Borrowed from a decommissioned bus LiAZ.
 
Front axle is manufactured using the node details (from scrapped automotive vehicles) and homemade. The latter, for example, include axle bushing front wheel bushing support-rotating rack. In the same number of listings and a beam front axle. Running it from a square cut pipe 65×5 or two half-cylinder welded steel corners № 6,3. And in the center of the cuts and welded a ready node, two tapered roller bearings 2507. This beam is installed on the axis of the bolt in the opening formed by the sleeves welded to the crossmember of the frame bracket on the front axle. But the backlash here is selected by the tension nut MLO, which laid the puck Grover.
 
Steering column from the car GAZ-21 “Volga”. And steering wheel mounted arm of the type “Shar” loader that allows you to easily control the tractor. Even using just one hand.
 
Wheels converted from an old car. Made separate and have an offset flange. This disc is more convenient to bortirovki. In addition, there is a real opportunity to change the track width depending on the performed works. About the features of such designs magazine wrote repeatedly, so here to consider more thoroughly is hardly appropriate.
Pneumatic tires of the front wheels, sidecar cover, rear (top) is from the tractor MTZ-50 “Belarus” or MTZ-80. There is also the option to install instead of the latest wheels from the trucks GAZ-51, GAZ-53, which has several large diameter and width, which in itself allows an increase in track up to 1350 mm. And this will agree, creates additional convenience when operating the mini-tractor to transport works.
 
The journal’s publications already mentioned, that the range of sizes of wheels, their diameter and rim width you should consider how the work will be predominant during the operation of MT. And with this, of course, could not agree more. For tractors, which have mainly to work on transport operations, the desired wheel rim size 13-16″. But for arable required rim 18-24″. Because these tires will have more traction. And the rolling resistance they have less than small wheels. Hence, as they say, and we must dance.
 
The winged wheel of our MT, Polycom, seat and gas tank made in a single unit, which is very convenient for repair and maintenance. It is enough to turn away from such a design only 4 bolts to disconnect the traction of the lifting hinged frame, and voilà! The entire unit is easily removed from the frame of the tractor.
As for the brakes, they are made separate. On each wheel. It is possible to create additional benefits in the management of MT. Especially when leaving the furrow during plowing.
 
Now a few words about the engine. It is applied from the sidecar. Installed on a special plate with grooves for the tension of the drive chain. However, the plate serves as a reinforcing element of the frame of the tractor.
 
Veneer? It is made of steel sheet 1.5 mm thick. Color — durable enamels with matching colours.
 
Due attention should be paid to electrical equipment MT. To provide illumination in front and rear, turn signal, beep. On the instrument panel to install the indicator light neutral gear, turn on high and low beam, charging, the pointer of the brakes. In short, to secure and to Refine the design of the MT to work on it was never a burden to you.
 
I cannot stress enough the fact that the mini-tractor was conceived as tilled. Hence the unusual mounting of the rear axle — butt to the frame of MT, allowing in pretty good (350 mm) clearance to have good stability, and other design features.
 
Sure: this mini tractor just can not please.
 
N. KORCHAGIN, Leningrad region

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