Starter for micromotor. Drawing, description

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Starter for micromotor. Tips for a modeler

Modeling

Start the micromotor manually? So you’ll beat off your fingers, and it’s far from always that capricious diesel engines start up with half a turn. And in competitions, the time limit for launching is very tight. I did not meet the allotted minutes - and instead of test numbers, "steering wheels" appear in the referee's protocols.

The winners are those who start the motors with a mechanical starter - a device consisting of a multiplier and a flywheel. Unfortunately, this device is quite difficult to manufacture, moreover, it is bulky and heavy. Is it possible to make a simpler starter?

In recent years, some modellers have been successfully using ... a gear rack to wind up engines. A thin steel strip-rail inserted into the textolite handle is engaged with a gear mounted on the motor shaft. A jerk by hand - and the engine, as a rule, starts.

Making such a starter is not too difficult. First of all, you need a gear with an external Ø 16-20 mm. The tooth module can be anything, but gears with too small a tooth should not be used - if the rack is distorted, which is inevitable during winding, they will quickly work out.

In the gear, a conical hole should be cut corresponding to the landing cone of the motor shaft, and its ends should be machined so that two protrusions form on the part. On one of them - from the side of the screw - triangular grooves are cut: a notch.

Starter for micromotor

Rice. 1. Starter for micromotors and its parts: 1 - screw fastening nut, 2 - washer, 3 - air pump, 4 - restrictive washers, 5 - gear, 6 - rod, 7 - latch body, 8 - spring

Starter for micromotor
Rice. 2. Installing the latch on the engine

Starter for micromotor
Rice. 3. Gear rack

The support of the gear rack when starting the micromotor is a special latch - a rod. The body of this unit is machined from duralumin, while the stem itself is a piece of steel bar Ø 6 mm. In the working position, it is held by a spiral spring wound from a wire Ø 0,25 mm.

It remains to make a gear rack. The length of its working part should be about 500 mm, and the thickness and height should correspond to the width of the gear and the distance from the rod to the circumference of the gear cavities. The tooth modules of the rack and pinion must be identical.

The rail handle is cut out of two textolite plates, adjusted to the arm, and a groove for the rail is sawn through it. Fastening the latter to the handle - M4 screws.

After the mutual adjustment of the parts, you can start the engine. First of all, retract the rod, put the rack on the gear and fix it with a latch. Holding the model with your left hand, pull the rail sharply towards you with your right hand - the engine will start.

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