Folding bicycle mechanism. Drawing, description

PERSONAL TRANSPORT: GROUND, WATER, AIR
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Folding bicycle mechanism. Personal transport

Personal transport: land, water, air

Directory / Personal transport: land, water, air

In recent decades, the world has experienced a cycling boom. A bicycle today on the planet is the number one vehicle, even a car is inferior to it: for every four-wheeled car, there are two two-wheeled ones.

The bicycle does not pollute the atmosphere and improves health. The author, in the past an avid motorcyclist and motorist, has long moved to a bicycle. Every year I "wind" one and a half to two thousand kilometers and I feel great!

The regular road bike I ride is fine with me. It is strong, easy to move, reliable and durable. However, all its advantages fade as soon as I go up with it to the platform to the train. And it’s really bad in the subway: you have to remove the front wheel, but where to put it and what to do with a protruding fork ?! Finally, a bulky road builder is also inconvenient in an apartment.

Typically, a folding bike has two connectors in the vertical plane: one on the horizontal tube of the frame, the other on the inclined one. There are many options for hinges for such connectors. My task was to develop the most simple. I settled on a loop-type design with a constipation in the form of a conventional bolt with a nut, which can always be replaced in case of loss or wear of the thread.

The device and operation of the hinges is easier to understand from the figures. Of course, even such simple units cannot be made at home, so I ordered them from a workshop that had lathes and milling machines. The material for the parts was the usual structural steel 35.

Folding bicycle mechanism
Frame marking: 1 - cut line; 2 - upper hinge; 3 - lower hinge

Upper hinge (click to enlarge): 1 - hinge axis; 2 - front cheek; 3 - back cheek; 4 - split sleeve; 5 - bolt, nut M8

Lower hinge (click to enlarge): 1 - hinge axis; 2 - front cheek; 3 - back cheek; 4 - split sleeve; 5 - bolt, nut M8

While my order was being fulfilled, I was reworking the frame. It is clear that it is better to fold the bike in half. However, if you cut the frame along a line equidistant from the axes of rotation of the wheels, then the axes will rest against each other and the bike will not be compact when folded. Therefore, I shifted the cut line by 50 mm towards the steering wheel so that the lower hinge was away from the drive sprocket and it did not interfere with the frame to fold freely. The design of the hinges provides for folding the bike from left to right (clockwise). In this case, the dirty chain is hidden between the wheels.

I soldered the hinges to the frame with brass using a gas burner. I used borax as a flux. Those who want to simplify this procedure can use M6 bolts with nuts instead of soldering. And for this, drill holes in the bushings of the hinges together with the frame pipes, after checking the correct installation of the hinges. Only during operation will you sometimes have to check and tighten the nuts. But if you rivet the protruding ends of the bolts, then you don’t have to tighten anything.

Folding my bike is simple: I unscrew two nuts on the hinges, move the steering wheel clockwise until the frame folds in half. After loosening the fixing nut, I turn the steering wheel 90 °. In this position, I fix the parts of the bike with a strap so that they do not move apart. And I return the hinge nuts to their place so that they are not lost.

Now I have no problems with the road builder. He folded it in half, placed it in a case made of dense fabric (no more than 1x1 m in size), tightened the braid on the neck - and get on your train or go down to the subway. Comfortable!

Author: N. Shershakov

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