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PERSONAL TRANSPORT: GROUND, WATER, AIR
City bike. Personal transport
Directory / Personal transport: land, water, air The city-bike was created on the basis of the Karpaty mokik (in principle, any other moped or mokik with a Sh-58, Sh-62 or V-50 engine would do). In particular, it used a front fork with a steering column, a rear swingarm with shock absorbers, a seat, a V-50 engine and all sorts of little things like a headlight, control handles and a taillight. City-bike wheels - from a mini-mokik made in Riga. The city bike was designed using flat models. To do this, the silhouettes of all finished units and assemblies - the engine, front and rear forks, shock absorber, headlights, etc. were drawn on cardboard in a 1: 2 scale convenient for work. Of course, an articulated driver silhouette was also required. The development of the layout began with the placement on the plane of the drawing of the articulated silhouette of a person in a position convenient for riding a mokike. Further, a seat and footrests were brought under the "driver", and the handles of the steering wheel were placed under his hands. From the position of the handles, the coordinates of the front fork and, accordingly, the front wheel were determined, after which it was not difficult, having given the wheelbase (in this case 1060 mm), to determine the coordinates of the center of the rear wheel, rear fork and shock absorber. The next stage of work is the placement of the power unit and the fuel tank. The most rational position of the motor on the frame is such that the center of the drive sprocket of the engine, the axis of the pendulum fork and the axis of the rear wheel are on the same straight line - in this case, when the rear fork swings, the drive chain tension drops are minimal. Thus, the location of the engine on the frame also turned out to be uniquely determined. And it was not difficult to place a fuel tank with a capacity of about 5 liters on a mokike: the only more or less suitable place for it was under the driver's saddle.
What followed was what required real design work from the linker - the combination of all the mokika components and assemblies with a rigid, durable and lightweight frame. The simplest version of it is in the figure. This is a spinal-type frame made of steel square pipes 34x34 mm and round ones with a diameter of 20 mm, with engine mounts (front and rear) and shock absorber mounting brackets. The manufacture of a city bike began with the assembly of a flat part of the frame, consisting of a spinal and seatpost beams and a steering column. These elements were joined on a chipboard, on which the city bike frame was previously drawn. Such a gap made it possible to adjust the frame elements and control its geometry after welding. The next stage is the manufacture and welding on the frame of the seatpost from a steel pipe with a diameter of 20 mm. The pipe was bent according to standard technology: it was filled with dry sand, the bend was heated with a blowtorch, after which the workpiece was twisted around a suitable mandrel (steel pipe) with a diameter of 130 mm. From a steel sheet 3 mm thick, the cheeks of the engine mounts and shock absorber brackets were cut. As can be seen from the drawing, the hinge of the pendulum fork and the bushing for fixing the footrest of the city bike are embedded in the cheeks of the rear engine mount. Both the hinge and the sleeve are pipe sections (the sleeve is 20x2 mm in diameter, the hinge is 22x2 mm). After fixing the cheeks of the rear assembly on the frame, the engine was installed in them, after which the cheeks of the front motor mount were fitted in place and tacked by welding. Then the engine is removed from the frame, and the cheeks are finally welded. Similarly welded to the seatpost of the frame and the cheeks of the shock absorber brackets. To check the correct assembly of the frame, the front and rear wheels were mounted on it, then the frame was turned over, and the parallelism of the wheels was checked in this position. The mokik footboards are a steel bar with a diameter of 16 mm, fixed in a sleeve designed for it with a pair of electric rivets. The footpegs are covered with mokick rubber boots. On the right side, a brake pedal is mounted, bent from a steel bar with a diameter of 10 mm, which is welded to a steel sleeve. A brake lever consisting of two steel plates 2,5 mm thick is fixed by welding on the same bushing, and a stop for the Bowden sheath of the brake cable is welded on the frame bushing. The fuel tank of the city bike is from a suitable 5 liter canister. To fix the canister on the seatpost of the frame, there are lodgements made of a steel strip with a section of 30x2 mm. At the bottom of the canister is a standard motorcycle faucet with a sediment filter. A drain hole is provided in the fuel tank plug with a simple valve made of thin sheet oil and petrol resistant rubber, which prevents fuel from leaking if the mokik accidentally falls.
Dimensions marked with * are specified during assembly.
The steering wheel of the city bike is from a mini-mokik made in Riga, but it is not so difficult to make it yourself from a steel pipe with a diameter of 22x1,5 mm. The headlight is fixed in brackets welded to the steering wheel. After mounting the saddle, engine and exhaust tract on the running gear of the city bike, the machine was adjusted and tested on the go. The last to be made was a lightweight fiberglass fairing, giving the mokiku the right to be called a city bike. The fairing was designed to be glued from fiberglass to a block, and this made it possible to give it an unusual shape. The blockhead was assembled from building foam blocks. To make the fairing symmetrical, we used the following method for processing the block. At first, only its left side was brought up, puttied with plasticine and several templates (made of thick cardboard) were removed from the blockhead. In accordance with these templates, the right side of the block was processed. At the end of the work, a thin polyethylene film was rolled to the plasticine surface, which ensures the removal of the shell from the block after gluing. Before gluing, the wax coating was removed from the fiberglass, for which the fiberglass was soaked in gasoline, but it can also be annealed - evenly stretch a strip of fiberglass over a heated electric stove. Epoxy resin was used as a bonding agent. To obtain a shell of the required thickness, it was necessary to apply five layers of fiberglass to the blockhead. After the polymerization of the resin, the shell was removed from the block, puttied and sanded, after which it was covered with primer and car primer. The finished fairing was fixed on the city bike frame at four points: to the upper bridge of the front fork, to the seatpost of the frame and to the rear engine mount using threaded bushings fixed to it. Author: I.Karamyshev
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