C-6: SIMPLICITY AND RATIONALITY

- 6: SIMPLICITY AND RATIONALITY- 6: SIMPLICITY AND RATIONALITYThe body of the sledges half-closed; it forms a frame of aluminum profiles sheathed by dural sheet with a thickness of 0.8 mm. In its rear part is installed under engine frame two U-shaped racks made of steel angles 25 X 25 mm and connected on top by two longitudinal profiles, between which is mounted the engine. Necessary for the transfer of traction rigidity is provided by two inclined rods connecting the upper part of the sub-frame with the body of the sled.

Suspension done by trehmernoi scheme: steerable and the two rear, mounted on a common axis. Last placed in vertical guides and is supported by two pairs of springs. The damping arising from the movement of the oscillations is caused by two motorcycle shock absorber.
 
All three skis of the same size. They are made of duralumin sheet thickness of 3 mm and corners. The sole forms a sheet of polyethylene with a thickness of 4 mm. On the inner side of the ski mounted mounting brackets. — steel pipes, welded with a transverse bushing-hub, which form the rigid pyramid “foot” skis.
Hub the front of the ski is fastened in the fork of a rotary steering shaft, and rear hub on the shanks of the rear axle.
 
To avoid revolution the rear of the ski when moving obstacles, their socks connect shock cords with side brackets of the housing.
 
Fig. 1. General view of the snowmobile-6
 
Fig. 1. General view of aerosea-6:
 
1 — front ski, 2 — pig-ski, 8 — pivot fork steering UPRAVLINNYA, 4 — body, b — foot pedal throttle control of the carburettor, 6 — cable reel steering column, 7 — frame windshield, an 8 — windscreen, 9 — wheel, 10 — seat, 11 — шкbв fuel pump 12 fuel pump 13 — starter motor pulley, 14 — relief of the arc of the propeller, 15 — engine K-750, 10 — propeller, 17 — exhaust pipe, 18 — bracket exhaust pipes, 19 — fuel hose from fuel pump 20 to the intermediate fuel tank (float chamber carb car), 21 — magneto 22 — fairing of the propeller 23 , the deflector 24 , the longitudinal profile sub-frame, 25 — frame sub (area 25X25 mm), 26 — bracket amortisation rack, 27 — inclined rod, 28 — neck of the fuel tank, 29 — spring suspension axle rear ski, 30 — motorcycle shock absorber, 31 — the hub of the rear skis, a 32 — brake, 33 — brackets ski, 34 — rear ski 35 safety cord, 36 – side bracket of the case, 37 — flip the strap to install a canvas awning.

 
Fig. 2. The design of the snowmobile-6
 
Fig. 2. The design of the snowmobile C-6:
 
1—front odnotonno frame (area 25X25 mm), 2—plates springs, 3—outer spring (left winding), 4—inner spring (right wrapped), 5—stop, 6—axis, 7—top shelf, T-shaped aluminum profile, 8—stanchions, aluminum strips, 9 — rib (aluminum sheet with a thickness of 3 mm), 10 — bearing surface of the ski (dural sheet, thickness of 3-4 mm), 11—undercut (steel strip thickness 0.9 mm) 12 — sole (polyethylene of low pressure, thickness 4 mm), 13 — mounting the rotary shaft 14 — bearing, 15 — transverse profile of the hull, the 16 — shank stub shaft, 17 — bolt M8 18 — rotary pulley, a 19 — shaft 20 — housing thrust bearing, 21 — longitudinal profile of the hull, a 22 — strengthening patch, sheet 3X300X300 mm, 23 — sheet metal housing, 24 — bearing, 25 — plug rotary shaft, 26 — the hub of hogs the front of the ski, a 27 — axis (bolt M12 with nut), 28 — hog the front of the ski, 29 , the axis 30 to the shank axis 31, is the hub of the rear skis, a 32 hinges 33, the fixing elements of the hub 34 — of the brake mechanism 35, the cable, P6 — arm brakes, a 37 — tension pulley 38, the cable steering, a 39 — rotary pulley, a 40 — cables, limiters, 41 clip.
 
Steering of the snowmobile is formed by two connected cable transmission node: the steering column, consisting of a shaft with a fortified it by the wheel and the cable drum, and a rotary shaft, welded the lower part to swivel the plug and mounted in the bearing Assembly. In the upper part of this shaft is fitted with a pulley to connect the control wires. Four intermediate rollers (two of which are spring loaded for tension) direct the cables from the drum to the pulley rotary shaft: this scheme allows you to choose the optimal slope that provides small roll administering skis in the direction of rotation, which reduces its lateral slip and improves handling. The cream, and the steering column can be installed in the most convenient for the driver position.

 
The motor of the snowmobile — a two-cylinder, four-stroke, motorcycle K-750 with air cooling. He is reliable, economical and has a capacity of 27 HP at 4600 rpm, which is enough for a message to sledges weighing up to 180 kg speed up to 60 km/h.
 
For installation of engine remove the gearbox, generator, and transaxle housing. Around the cylinders and heads install baffles, which ensure their efficient cooling and (with the side pipes) the blowout of the carburetor with warm air. It helps to improve the evaporation of fuel and prevents icing of the carburetor when operating in freezing weather.
A slightly modified fuel system. Since the tank is located at the bottom of the housing, the supply of gasoline is carried out using a automotive fuel pump. But motorcycle carburetor K-37 is designed to feed it fuel by gravity. To forced feed from a pump is not called “transfusion” of the float chamber, is used intermediate the fuel tank, mounted directly on the engine. For this purpose, the preferred float chamber from the carburetor of any car: the valve will maintain the necessary level and to a working carb the fuel will go by gravity.
 
The drive pump is made as a separate unit installed on the front sub-frame. The stem of the diaphragm communicates with the eccentric shaft rotating in bearings of the casing V-belt drive from front of crankshaft pulley.
 
Battery ignition system replaced the magneto, installed at the place of the removed generator. The rotor drive — gear from camshaft.
 
As kickstarter engine start is inconvenient, you can use the manual start cord — like outboard motors. On the front end of the crankshaft pulley is installed, a large Creek which is used for start-up and small — to drive the fuel pump.
 
Figure 3. Drive fuel pump
 
Figure 3. Drive fuel pump:
 
1, the starter pulley, 2 — motor, 3 — bearing engine, 4 — front sub-frame, 5 — elements of fastening of the drive body 6 bearing No. 201, 7 — sheave eccentric shaft, 8 — mounting elements, 9 — eccentric shaft, 10 — housing, 11 — V belt.
 
Fig. 4. The shaft Assembly propeller
 
Fig. 4. The shaft Assembly propeller:
 
1— stud fastening Coca, 2 — COC (spinner) propeller, 3 — disk, 4 — bolts of the propeller, 3 — propeller, nut and washer in the hub of the propeller, 7 — key, 8 — the hub of the propeller, 9 — cover housing bearing Assembly, 10 — felt oil seal, 11 — ball bearing No. 206, 12 — distance sleeve, 13 — building, 14 — shaft, 15 — transitional flange case, a 16 — finger coupling shaft. 17 — rubber clutch, 18 — ring.
 
Fig. 5. Propeller.
 
Fig. 5. Propeller.
 
Air two-bladed propeller is laminated from spruce and pine bars, and after machining are covered with nylon, painted with enamel and polished. Although the reduction of rotation frequency in the circuit is not provided, set the air screw on the shank of the crankshaft of the engine is undesirable, since the elements of the axial fixing of the crankshaft in the crankcase is not designed for high axial loads. Therefore, the propeller is mounted using a centering sleeve on an independent shaft mounted in the bearing Assembly. Chiseled aluminum case that node is fitted directly to the crankcase through the transition flange. Rotation with the flywheel of the motor shaft and the shaft of the propeller is transmitted to the finger coupling with the cushion plate covered by a stainless steel ring.
 
Management snowmobile — steering, the drive from the gas pedal to the carb, and the brake arm to the levers mounted on the rear ski — rope.
 
An essential element of the security of snowmobiles is a tubular protection of the propeller, which is attached to the underframe, and the top — directly to the engine. Two brace give the fence additional strength.
 
Comfort for the driver provides the windscreen, and in inclement weather a canvas awning pulled over the cab leans back on the two U-shaped frames.
 
I. SHVETCHIKOV

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