STEEL “BEETLE”

The prototype of tillers was similar was built by my father over ten years ago. He had the motor scooter “Vyatka-Electron” power of seven HP Wheels were also from the same bike. For cultivation of land on the wheels were worn chain lugs.
My version of a walking tractor that loses compactness, but wins in power — it has an engine from a motorcycle “Voskhod-ZM” capacity 14 HP ignition System from scooter “Vyatka-Electron”. The cooling of the cylinder of the engine is too forced: for this we used a homemade supply fan; about him later.

The kinematics of the walk-behind tractor is simple and, one might say, ordinary, except that her chain included reversing mechanism. As the cultivator there is no differential, the use of reverse turns or hairpin bends significantly reduces the radius of the execution of these maneuvers.

Rotational motion from the transmission output shaft of the engine through a chain transmission is transmitted to the sprocket mounted on the shaft of the reverse, and from him — through the gear pair to the shaft of the gearbox and then once on both wheels.

The basis for the design of two-wheel tractor is the gear case main gear — steel drum with a diameter of 240 mm and a length of 250 mm. is welded To the body pillar of the engine subframe. On the subframe to mount the motor with all necessary devices: the carburetor, muffler and fuel tank unit and the ignition system. At the same time with the frame (using one of his stands) made a portal, which through the connecting flanges are attached to steering levers. Under the portal-to-gear case welded bracket-tow bar for connection to the tillers of the suspension with different tillage implements.

Walk-Behind Bug:

1 – steering arm (2 PCs); 2 — arm gear; 3—the block of ignition system; 4 — fuel tank (from a moped “Riga”); 5 — the engine (from a motorcycle “Voskhod-ZM): 6 fan: 7 — thrust gear (steel wire d6); 8 — casing the drive chain (steel sheet s0,5); 9 — under engine frame; 10 the plow (on the front view of the conventionally not shown); 11 hinge; 12 — wheel (2 PCs.); 13 silencer; 14 — lever cutoffs of coupling; 15 — grip throttle; 16 — reverse lever; 17 — drive shaft; 18, the gear unit

Base:

1 — housing gear (ZIL-130); 2 — removable mounting flange reducer (STZ. sheet s7); 3 — M6 screws (8 PCs); 4 wiity M8 (12 vols.); 5 — bearing unit: bearing cage with cover and seal (2 sets.); 6 — ring for attaching a removable flange (STD. sheet s7); 7 — engine subframe (steel pipe 3/4″); 8 — front bracket dvsh AES (STZ, sheet s2); 9 of the rear mounting bracket of the engine (STZ, sheet s2); 10 — plate (STZ, sheet s2, 2); 11—fuel tank; 12 — mounting sleeve (tube 1/4″, 2); 13 — jumper (STZ, sheet s2); 14 — zastavka-a flange of fastening of a crankcase of the reverse (steel, sheet s12); 15 — bushing mount arm reverse ( coarse 1/4″); 16— flange mounting steering arms (2 PCs): 17 — the portal steering levers (steel pipe 3/4″); fixed flange 18 of the gearbox housing (STZ, the sheet s7); 19 – headstock tillers; 20 — eyelet re wirawati thrust of the plow; 21 — Klondike (STZ. sheet s2. 3 PCs.)

Wheel:

1 —grouser (steel plate 100x40x4, 16 items); 2 rim (steel strip 100×4); 3 — disk (sheet s4); 4 — spline hub (GAZ-66); 5 — M12 (6 PCs.)

Steering levers:

1 — connecting flange (2 PCs); 2 – the lever (water pipe 1/2″, 2); 3 – jumper (water pipe 1/2″)

Wheel drive:

1 —reducer; 2—reverse mechanism; 3 — sprocket driven valuable transmission; 4-chain; 5 — a leading asterisk of a chain drive (sprocket output fell engine)

Connecting mating flanges (material — STZ. round 63) and the flange of the portal strut; b is the flange on the steering lever

Drive shaft with gear wheel main gear in the gear housing (sub-frame conventionally not shown):

1 —housing: 2 — bearing race 207 (2); 3 – drive shaft of wheels: 4 — gear

System forced air cooled engine:

1 —special screw М7х1 attaching a driving pulley to a gauge-nal engine (steel 45): 2 leading pulley (duralumin. lap 62); 3 — drive belt 07 (rubber): 4 — clutch pulley — impeller shaft (duralumin, circle 62); 5 — ring enclosing the impeller (sheet s3); 6 case two podshipnikov 80018 (steel, lap 22); 7 spokes (steel profile s2, 4x); 8 — impeller (steel sheet 1, I); 9 the hub of the impeller (steel, lap 16); 10 — casing (aluminum, sheet s2); 11 – upper bracket (steel strip 20×3, 2); 12 — lower bracket (steel strip 20×3)

The layout of three-level walk-behind: at the top of the fuel tank; in the mid — power unit: the bottom — transmission

Gearbox borrowed from the truck ZIL-130 is the air receiver of braking system. The receiver cylinder (with a diameter of 240 mm) was cut to a length of 243 mm. on the left side of the case welded circular flange of steel 7-mm sheet with a Central hole. In the hole is inserted and welded cage under 207 bearing. On the right side in the housing flush with the welded edge of the first ring 12 threaded holes M8. To him the proper screws is mounted a removable flange, made as a ring, also from 7-mm steel sheet. In the right flange as the left, is inserted into the hole and is welded on the clip under 207 bearing. Holder, after Assembly in the gear housing drive shaft with gear wheel, the closed lids with alenikovym seals. For this purpose in the flanges made 4 threaded holes M6.

The drive shaft of the wheels is made of three segments spline shafts: the middle part — from the gearbox ZIL-130, and end pieces — from the transfer box of the car GAZ-66. In the middle part of the shaft mounted gear — first gear transmission ZIL-130.

In the cylinder housing and cut the window in his loop welded rectangular spacer-flange for mounting to the housing of the crankcase reversing mechanism. Through the window, engages with the gear wheel protruding from the housing of the reverse gear.

The reversing mechanism along with Carter is the PTO of the vehicle ZIL-13. To the flange it of the output shaft (it now serves as the input shaft of the reverse) bolted through the spacer 40-bevel sprocket driven, borrowed from the motorcycle “Voskhod-2”. This sprocket connected by roller chain from the drive sprocket of the transmission output shaft of the engine.

The levers of the cultivator made of steel pipes with outside diameter of 23 mm. the Upper ends of the levers about arms connected with a cross from the same pipe. To the lower ends of the arms welded to the flanges — the “response” details those that are on the uprights of the portal on the gear housing. Each flange is drilled for four holes with a diameter of 8.2 mm, through which bolts M8 lock washers (often called techies “gavernie” — named after their inventor Grover) levers and attached to the portal grounds.

On the left steering lever fixed gear shift grip.

To avoid high excesses of the throttle cables the carb and clutch grip throttle mounted on the left lever, and clutch lever is on the right. Such a location of controls (back of motorcycle) initially required some getting used to but it came swiftly.

Wheel walking tractor used for cultivation of land on the estate, home — made, all steel and is very simple: for disc with a diameter of 450 mm is welded to the rim, and the rim is along the entire circumference at equal intervals -16 lug. All the parts wheels are made from the same material —4 mm steel sheet. Wheel hub — flange of the propeller shaft from the car GAZ-66. For transport work, when the walk-behind tractor used as a tractor single-axle sprung carts, homemade wheel replaced on the car (155 RS), the same as on the trolley. The truck has a brake on both wheels.

To work the land produced a series of tillage tools: plough, cultivator, graddol, potato digger etc. and road trailer. Connection to equipment is made via a suspension having a plurality of nodes adjustments. The suspension bracket is connected with only one pin.

The fact that the cultivator has no differential forces when cornering to make significant efforts on the controls, but when plowing in a straight line when properly adjusted the plow behind tractor goes smoothly, even without the active intervention of the ploughman and the furrow does not spoil.

Because the speed of the walking tractor and high engine speed too low to provide proper cooling of the engine cylinder, had to mount forced air cooling system.

Cooling system although homemade, but the layout and principle of operation are the same as that of design in the engines of scooters, motorcycles and other motor vehicles.

The drive of the impeller of the fan from the crankshaft of the motor through kruglozerny transmission with pulleys of the same diameter (reduction ratio is equal to 1).

A drive pulley is attached to a special long screw М7х1 to the crankshaft of the engine. To do this, in the end conforming to an axial screw threaded socket.

Supply fan with a four-bladed impeller. Impeller made of steel 1 mm sheet and put through the hub on the shaft mounted in two bearings 80018 (with two dust washers). The shaft is made as one piece with the driven pulley kruglozerny (diameter 7 mm). Both the bearings and the driven shaft are mounted in a single housing with opposite sides. The case itself on four spokes “suspended” in the centre of the enclosing ring made of steel strip section 40×3 mm. Ring by means of brackets attached to the engine.

To air flow from impeller to motor is less dispersed, with the top of the cylinder to the end of the set restrictive casing made from thin dural sheet.

A. KLIMENKO, S. Chernigovka, Primorsky Krai