Motoski Metel. Drawing, description

PERSONAL TRANSPORT: GROUND, WATER, AIR
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Motoski Metel. Personal transport

Personal transport: land, water, air

Directory / Personal transport: land, water, air

In the snowmobile "Metel", which I designed, based on many developments published in "M-K", elements of the schemes of the classic motonart, "amphitrak", snow scooter were combined. snowmobiles and air skis, that is, almost all known snowmobile mechanisms. At the same time, my vehicle cannot be attributed to any of these groups - after all, it is a combination of a motorized caterpillar mover and skis on which the driver stands. That's why I called my snowmobile skis. Riding them is really very reminiscent of the usual walk on wads, as the driver stands to control the snowmobile. The experience of its operation has shown that the scheme has a number of advantages: high maneuverability and good cross-country ability at a quite satisfactory speed - up to 15-25 km.h.

Motorcycle skis Metel

Motoskis consist of two main elements: a walk-behind tractor with a caterpillar drive and skis directly connected to the walk-behind tractor with a universal joint. Propulsion control is carried out with the help of a remote steering wheel and handles for gas, clutch and variator control. In order for the skids to better track the surface when moving on a slope, the skis are connected by a parallelogram. This arrangement, combined with the universal joint, provides the undercarriage with greater flexibility, which is especially important when driving on uneven surfaces.

Rice. 1. Skis "Metel": 1 - engine starting pulley, 2 - sprocket Z = 15, 3 - sprocket Z = 30, 4 - variator pulley d 180 mm, 5 - variator pulley d 100 mm, 6 - variator pulley d 230 mm , 7 - dry double clutch, 8 - sprocket Z = 15, 9 - drive chain, 10 - side sprocket Z = 45, 11 - towing rocker, 12 - ski attachment link, 13 - caterpillar sprockets Z = 12, 14 - transverse spars, 15 - sub-engine spar, 16 - ski, 17 - parallelogram, 18 - throttle control handle, 19 - variator control handle, 20 - clutch handle, 21 - reverse mechanism, 22 - clutch lever

Motoblock frame - four bearing spars, four crossbars welded to them and two more spars serving as a sub-frame. A buffer visor is attached to the latter at an angle of 35 ° in front, and loops for hanging the towing arm are attached to the rear. All spars made of two-millimeter steel have a channel section measuring 45x30 mm. You can also use thin-walled pipes d 35-40 mm. The ends of the bearing spars are equipped with tips for tensioning the tracks. In the shanks welded to the walls, adjustment holes were made (in the front - three each, in the rear - two each). Bearings No. 203, closed with nuts, are pressed into the cups.

Rice. 2. Chassis frame with propulsion elements (linings of track rollers are conditionally not shown in the side view) (click to enlarge): 1 - carrier spar, 2 - tip cup, 3 - track roller rack, 4 - track roller, 5 - sprocket caterpillar drive, 6 - transverse spar, 7 - drive sprocket, 8 - axle of track rollers, 9 - pad, 10 - clutch, 11 - washer (welded to pad 9), 12 - M8 nut, 13 - expansion roller, 14 - coupling bolt M8x60, 15 - bearing No. 29, 16 - rubber rim of the roller, 17 - hole for the coupling bolt M6x40. On the section A-A, the transverse spars are conventionally not shown

Three support posts are bolted to each bearing spar, in which one roller is installed. To reduce the weight of the rack lightened by drilling. The roller hubs consist of two halves, machined from AL-2 alloy and fastened with tie bolts. The rollers have a rubber rim and are connected in pairs by axles. Longitudinal pads are put on the latter, connecting three pairs of road wheels and giving the necessary rigidity to the entire propulsion structure.

The caterpillar is a conveyor belt with a thickness of 7 mm, a width of 300 and a deployed length of 2900 mm. 50 rails are riveted to it with a step of 58 mm.

The caterpillars are driven by two pairs of rear sprockets connected to each other by an intermediate shaft. The drive and tension sprockets are identical and are made of 18 mm PCB (Z = 12). On the intermediate shaft there is an onboard sprocket (Z = 45), to which the torque is transmitted from the engine through a chain drive. Both propellers rotate synchronously; rotation of the motorized pyzh is carried out by changing the direction of the entire motorized tractor.

Rice. 3. Cup-tip (click to enlarge): 1 - bearing spar (channel 45x30), 2 - cup shank (channel 41x25), 3 - cup body, 4 - sprocket shaft, 5 - pressure washer (M42 nut), 6 - gun M16x15, 7 - shank mounting bolt M8x20, 8, 9,11 - spacer bushings, 10 - bearing No. 203

Now about the power plant. Many amateurs use the PD-10 launcher with an Izhevsk cylinder. I managed to perform a similar combination, only with a PD-8 engine and a cylinder from a Tula scooter. The fact is that the PD-8 has purge windows of small cross section, therefore, due to the replacement of its cylinder with a cylinder from a T-200 or Tulitsa scooter, the engine power increases from 8 to 10-12 hp. With. Since the cylinder head on the PD-8 is designed for a large volume of the combustion chamber, in order to maintain the same compression ratio as on the T-200, a scooter head had to be used. In addition, the protrusions of the former gearbox were trimmed at the PD-8 crankcase. The result is a simple and fairly reliable engine. The motor is started using a cord, for which a pulley is installed on the left trunnion of the crankshaft.

Rice. 4. Track (click to enlarge): 1 - rail assembly, 2 - bracket, 3 - rubber strips, 4 - rivet

The most important element of the transmission of motorcycle skis - a variator combined with a dry double-plate clutch - was made by me according to my own calculations, but I cannot recommend repeating it to others in the same design. The fact is that I counted on the specific belt that I had at my disposal. I think its design and some parameters (in particular, the control range) can be improved. The only thing I can advise amateurs: if the belt is relatively narrow, then to increase the adjustment range, it is useful to mill the pulley disks, which will allow the halves of the pulley to fit into each other (on motor skis, this mutual entry is 10-15 mm).

During operation, it turned out that a significant part of the power is spent on the rotation of the propulsion unit. It is therefore advisable to reduce the thickness of the caterpillar belt to 4-5 mm in order to give it greater elasticity. There are reserves in lightening the design: many of its power elements can be made from lighter materials. To reduce the specific load on the ground, it is useful to increase the width of the tracks. So I have plans in the future to significantly improve my "Metel".

Author: N.Skrebnev

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