Snowmobile gearbox. Drawing, description

PERSONAL TRANSPORT: GROUND, WATER, AIR
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Snowmobile gearbox. Personal transport

Personal transport: land, water, air

Directory / Personal transport: land, water, air

Snowmobile designers know that it is unprofitable to directly connect the crankshaft of the engine and the propeller: too high engine speeds make it impossible to use the air propulsion unit in the optimal mode. To reduce the speed of the screw, amateur designers use chain gearboxes, flat-toothed belts, and multi-ribbed V-belt transmissions. You can also find the most reliable and compact single-stage gear reducers. As a rule, however, they are quite complex. The simplest design was developed by M. Psarev, one of the enthusiasts of amateur "aerosanitation" from the city of Tchaikovsky, Perm Region. The manufacturability of its mechanism is evidenced at least by the fact that it was "produced" in a kind of microseries - it was repeated at least five times. Today we introduce you to the drawings and manufacturing technology of this gearbox.

A single-stage gearbox with helical gears PV-1 (Fig. 1) is designed to work in tandem with engines of the M-72 and K-750 types. Its gear ratio is 1,9.

The body of the mechanism consists of a cover and a crankcase, cast from an aluminum alloy. In particular, for this I melted the pistons and crankcases of old engines in a home-made cupola. Casting was carried out on wooden models in a sand mold. The models themselves are simple - they were assembled from plywood, carpentry glue and nails, followed by impregnation with drying oil and enamel painting. The bearing caps were cast in the same way.

Reducer gears - from the gearbox of the Volga car. For the leading one, a gear wheel from the input shaft of the box with the number of teeth Z = 15 came up. The driven has 29 teeth.

snowmobile gearbox
Rice. 1. Reducer PV-1

Gears are attached to the shafts by electric welding.

The processing of the gearbox housing begins with the mutual adjustment of the cover and crankcase. After that, the holes are cut, the parts are connected to each other with M6 bolts. On it, the crankcase is installed in a three-jaw chuck of a lathe (228 mm in diameter) and the parting plane is trimmed to a size of 109 mm. After the final adjustment, the crankcase cover is attached to the latter with eight bolts.

The next operation is the processing of holes for bearings. To do this, a through hole is drilled in the assembled housing on the same lathe, after which a seat for the input shaft bearing is bored in the cover. Next, the cover is removed, and holes for the bearing and stuffing box are machined in the housing. It remains to trim the inner wall of the crankcase, which is 43 mm from the plane of the connector.

To process the landing shoulder (Ø 228 mm), you will have to machine a mandrel - a cylinder with an external Ø 46 mm.

(click to enlarge)

Rice. 2. The layout of the gearbox (click to enlarge): 1 - crankcase, 2 - bearing 7305U, 3 - gear, 4 - bearing 206, 5 - gearbox cover, 6 - M8 bolt with nut, 7 - spacer sleeve, 8 - cam, 9 - key, 10 - spacer sleeve, 11-bearing 206, 12 - bearing cap, 13 - M8 threaded stud with nut, 14 - stuffing box, 15 - gearbox output shaft, 16 - M8 stud for fuel pump mounting, 17 - clutch lever, 18 - cover, 19 - stop, 20 - bearing, 21 - bearing assembly cover, 22 - clutch rod, 23 - oil seal, 24, 26 - bearings 303, 25 - gear, 27 - oil seal, 28 - drive shaft of the gearbox, 29 - cam, 30 - fuel pump pusher, 31 - M8 stud with nut

On the mandrel, the crankcase is fixed with a bolt or pressed by the rotating center of the tailstock.

Further processing of the crankcase must be carried out in a four-jaw chuck of a lathe. The part should be clamped in it in such a way that the distance between the axis of the already divided hole and the axis of rotation of the cartridge is 74,6 mm (center-to-center distance for a gear pair). The sequence of operations when boring holes for bearings and seals is almost the same as for the output shaft.

The manufacture of the remaining parts and the assembly of the gearbox are unlikely to cause any special difficulties.

Author: M.Psarev

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