Motorcycle tractor. Drawing, description

PERSONAL TRANSPORT: GROUND, WATER, AIR
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Motorcycle tractor. Personal transport

Personal transport: land, water, air

Directory / Personal transport: land, water, air

Any amateur designer is first of all interested in how much work to be done, what parts and assemblies he will have to do himself, so that, as they say, the car will go. Therefore, I will immediately list: the following main components were assembled or manufactured differently - a gearbox in a block with a differential, a power drive for the rear wheels and their suspension housings, a body frame, and a brake mechanism. At the same time, I used some parts from the S3B motorized carriage: I took the engine cooling system, differential, cardan joints, springs and friction dampers of the rear suspension from it.

(click to enlarge)

I would call the built car a mini-motor tractor, because its base is only 1850 mm, the track is 1100 mm, and the base is the IZH motorcycle. During the alteration, a three-wheeled structure was obtained, similar in scheme to the Ant cargo scooter.

The engine left the regular one, but added forced airflow: removed the left crankcase cover and replaced it with a fan from S3B with its casing.

The transmission from the engine to the rear wheels is carried out through the "reducer - differential" block.

the duralumin case for the block was cast by simple casting into the ground. In the manufacture of the gearbox, some gears and shafts from the IZH gearbox with a switching mechanism and a differential from a motorized carriage were used. Workers - three gears: two forward (two-stage) and one reverse (single-stage). Gear ratios for high-speed transmission 1,14, for reduced working - 2,55, reverse - 2,41. Traction force from the engine is transmitted by a roller chain directly to the secondary shaft of the gearbox: the first gear on the intermediate shaft is removed. To drive the chain, two sprockets from the secondary shaft of the gearbox for 18 teeth were used - a gear ratio of 1; tractive effort from the gearbox to the rear wheels - from the output shafts of the differential (with cardan nirs from S3B) through cardan shafts, couplings, shafts of intermediate supports and their drive sprockets (also 18 teeth), roller chains. For safe operation and protection against contamination, the chains are placed in casings. The sprockets are also covered with housings and rubber boots. Bearings of intermediate supports are installed in special housings.

ski bike
Rice. 1. The layout of the main components and assemblies of the tractor: 1 - frame, 2 - rear wheel, 3 - rear wheel axle, 4 - chain case, 5 - drive sprocket housing, 6 - support kerchief, 7 - intermediate shaft support, 8 - cardan coupling shaft, 9 - gearbox mounting eye, 10 - gearbox-differential block, 11 - motorcycle engine

Rice. 2. Kinematic diagram of the power transmission: 1 - engine, 2 - roller chain, 3 - gearbox-differential unit, 4 - output shaft cardan joint, 5 - cardan shaft, 6 - coupling, 7 - intermediate support, 8 - intermediate shaft , 9 - drive sprocket, 10 - rear wheel driven sprocket

Rice. 3. Rear wheel drive: 1 - shaft nut, 2 - pins, 3 - shim, 4 - outer disk, 5 - bearing No. 305, 6 - hub, 7 - outer spacer, 8 - inner spacer, 9 - axle wheels, 10 - bearing No. 206, 11 - rubber bushing, 12 - inner disc, 13 - felt seal, 14 - driven sprocket, 15 - leather seal, 16 - brake shoe, 17 - M8 thrust screw, 18 - suspension spring, 19 - spacer sleeve, 20 - suspension housing, 21 - sprocket housing, 22 - eccentric brake leash, 23 - housing mounting screw, 24 - sprocket sleeve (bronze)

Shaft fastening is keyed. The rear wheels have regular driven sprockets with brake drums: the gear ratio on the sprockets "leading - driven" is 2,33. All roller caps are also standard - P-4. Finger couplings, from the M-72 motorcycle. To adjust the tension of the chains, the possibility of some movement of the gearbox unit and intermediate supports is provided.

Sufficiently soft depreciation is achieved due to the elastic suspension of the rear axle on springs from a motorized carriage with friction dampers and rubber buffers.

Suspension cantilever, with triangular "paws" of pipes. Its axle-bolts pass through the lugs of the underbody frame, and the wheel axle is installed in the suspension housing and is pressed against the stop by the fastening screw. The body consists of box-shaped parts: a base and a clamping bar, welded to the "legs" on one side, and bolted together on the other.

The driven sprocket of the rear wheel is mounted directly on the axle - on a bronze bearing - and is connected with the fingers (like a clutch) to the inner disk of the wheel hub, in which the corresponding windows are drilled for this. In addition, it, like the outer disc, has holes for reinforced knitting needles Ø 5 mm. The hub rotates on two bearings; the knot ends with a nut with a check.

ski bike
Rice. 4. Cardan shaft coupling and drive sprocket: 1 - sprocket housing cover, 2 - shaft nut, 3 - sprocket housing, 4 - support housing, 5 - housing cover, 6 - intermediate shaft, 7 - coupling, 8 - cardan shaft, 9 - key, 10 - felt gland, 11 - thrust nut, 12 - ring, 13 - bearing No. 205, 14 - inner spacer, 15 - outer spacer, 16 - bearing No. 2505, 17 - oil seal, 18 - sprocket

Rice. 5. Underbody frame

Rice. 6. Rear wheel axle suspension (click to enlarge): 1 - suspension axle, 2 - bushing (bronze), 3 - support bushing (pipe 38X2), 4 - main link (pipe 38X2), workpiece length 340 mm, 5 - axle wheels, 6 - suspension base, 7 - clamping bar, 8 - stop, 9 - M8X60 screw, 10 - angular rod

The frame of the tractor consists of two parts interconnected by studs: the front one from IZH-49 and the rear underbody - homemade. The latter is a three-dimensional structure of longitudinal and transverse beams, as well as racks. It is welded, from pipes; the curved side beam is supporting - a support for the intermediate shafts of the power transmission with a drive sprocket is installed on it on a scarf. Lugs and corners are welded to the frame for fastening the gearbox unit, the intermediate axle of the brake rods, the rear wheel suspension, the silencer, the position lights, the hinge of the semi-trailer hitch, and the body locks.

The front fork of the tractor is standard. Front brake drive manual; on the rear wheels with regular brake drums - foot rods.

A tipping body with a load capacity of 200 kg can be installed on the frame. The tractor is also capable of towing a two-wheeled semi-trailer with a load of up to 600 kg. The frame has a special hinge for their attachment.

Author: D.Chernyshev

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