Snowmobile is a very necessary vehicle for residents of the northern latitudes of Russia. Not always road conditions make it possible to get close, for example, to a fishing place or to a remote village. Some get ready-made items, while others make a homemade snowmobile. From a chainsaw, you can take an engine whose power will be enough to move the entire structure at high speed. In addition, several people can be seated on it and put a couple of suitcases. How to make a homemade snowmobile with your own hands?
Saw selection
In fact, the brand of the engine is not critical for a device such as a snowmobile. This is an imported unit or domestic - it does not matter, the main thing is that it pulls well. There is not much difference between whether a home-made snowmobile will be made from a Shtil chainsaw or a Russian Ural.
How good should it be?
The most critical element in this unit is the engine. All other parts, such as a chain or a tire, do not play a significant role in the design of such a vehicle, so the main thing is to monitor and control the operation of the motor. If it is working, the snowmobile will always be on the go. If you decide to take the engine from imported chainsaws, you can not purchase a new device under warranty in the store. The second-hand option is quite suitable.
The only part in the chainsaw, which should also be in working condition along with the engine, is the gearbox. He is also useful to us in work.
We make a homemade snowmobile from the Ural chainsaw: drawings
You should take care of the schemes. On paper, you need to draw the location of such important components and assemblies as:
- Engine.
- Transmission.
- Skiing.
- Caterpillar.
The last part can not be constructed from scratch, but you can take the old Buran from the snowmobile. The same applies to skiing - tools from a children's snow scooter are quite suitable.
How to make a homemade snowmobile from a chainsaw?
To start, we make the frame. Here we will need several steel corners measuring 50 x 36 millimeters and two steel plates 2 mm thick each. To give rigidity to the sheets, it is necessary to wrap the edges at an angle of 90 about . Make through holes in each of the plates. In the front, it is needed under the drive track shaft, and in the rear, under the axis of the idler guide rails. The last devices must be mounted at both ends of the spar.
From below, weld an additional few brackets to the frame, observing equal gaps between their locations. Mount the axle of the track rollers into the slots open from the bottom. The total number of rollers should be 18. You should place them on 5 axes (centered in a checkerboard pattern). The rollers can be made of kapron and put on rubber tires. You can go the simpler way and take the finished part from the potato sorting machine.
The axis of the rollers can be borrowed from a potato digger. Their ends need to be released a little. This is done so that the axis can be machined and threading 10 mm. When making a homemade snowmobile from a chainsaw, do not forget about the distance bushings. They should be placed directly on the axes of the unit. It is best to take bushings from a duralumin pipe. Next, the axles are fixed using fixing bolts or a lock nut. The same principle is going to make a homemade snowmobile from the Friendship chainsaw.
Racks
At the next stage, 3 racks made from a steel corner must be welded to the spar. The best option would be corners measuring 30 x 30 mm. They also need to be joined with steel cross members. So the design will form a small portal. Between the front part and the middle on the right side, make a platform - weld a steel sheet of 2 mm. After that, place the chainsaw gearbox and the intermediate chain drive shaft here.
In the space between the rear portal and its middle part, a box can be installed. What for? It will serve as a support for the seat, which must be welded there at the final stage.
The front of the frame should connect to the front axle yoke. As a beam, you can use a conventional water pipe with a diameter of at least 30 mm.
Weld the sleeves of the steering skis to the ends of this pipe. In the middle of the beam, attach a stand that will serve as a motor subframe. All these details also need to be made of a pipe, and in places of joints on the uprights and the beam, additional scarves should be welded from a 2 mm steel sheet. So the design will become strong and, accordingly, reliable.
Caterpillar
Those who made homemade mini snowmobiles from chainsaws take tracks from the old Buran. However, for it to function normally, it needs to be slightly shortened (by 500 mm) and sewn with a transport tape. Make gears from a nylon sheet of 15 mm.
Drive shaft
It will be a tubular type with a diameter of 28 mm. A round flange with gear holes should be put on it. Press the ends of the drive shaft into place and weld the solid trunnion tips. The latter should be grooved under the bearings.
It should be noted that the left tip should be slightly shorter than the right. On the extension, make a keyway to fit the driven star of the second stage of the chain drive. This part is also called the sprocket of the track drive shaft and is secured with a 14 mm nut. Previously, this thread should be made appropriate thread.
The dimensions of the tips of the tension shaft must be the same and fastened similarly to the drive devices.
About the engine
It’s best to make a homemade snowmobile from a Ural or Friendship chainsaw. Although the imported "Calm" is also suitable (though it costs like 5 of our domestic devices). So how to make a homemade snowmobile? The power unit must be mounted on an engine mount, on which the gas tank should then be placed. This whole structure is welded to the transverse beam. As for the gearbox, it will be rotated 180 degrees in the opposite direction and fixed together with the “creeper” on the site of the two-stage chain transmission. The latter is the entire gearbox.
Stars
The driven star of the first gear stage should have the largest number of teeth. On Ural chainsaw engines, this value is exactly 38 pieces. The drive sprocket of the second stage has 10 teeth. The pitch of these devices is the same - 15.875 mm. By the way, the same step is installed on the Minsk motorcycle.
Steering
It will consist of supporting steering skis and will be connected by rigid rods to the bipod of the steering shaft. The wheel itself can be taken from any Soviet motorcycle. The main thing is that it is 3-lever. Near the right knob, install the shifter - a small lever that performs the same functions as the gas pedal on the car.
It doesn’t matter if you make a home-made snowmobile from the "Calm" or "Ural" chainsaw, the shifter should be, as it is an integral part in the design of this unit.
Brake system
It is not necessary to install it, since in most cases a homemade snowmobile from a chainsaw does not develop high speeds and stops itself. However, for safety, brakes can be made, however, this will significantly complicate its design.