Bottle dynamo

A side dynamo rotor, a bicycle dynamo is mounted to the front fork ( fork blade ) or on the frame in such a way that the friction wheel can be driven by the side walls ( edges) of the tire.

History

Easy side rotor dynamos are built especially for low-cost bicycles. Until the 1990s, as Dynamo other types (such as hub dynamo, Dynamo spoke ) came more into the trade, they were the usual power generators for the bike.

A special design represents the rim Dynamo

On and off

During operation of the dynamo is pivoted by a spring against the tire. To turn it can be locked in a swiveled position.

Drive and setting

Like all Reibradübertragungen is this subject to slip. Thus, the friction roller and in particular the tire sidewall are subject to heavy wear. It may also in wet or slush to slip and thereby come to right up to a failure of the power generation. As a remedy, there are rubber caps that can be placed over the friction wheel. The larger size and coarser Profile reduce the slip.

For optimum running characteristics of a dynamo rotor side is to be noted that

• In Page view, its longitudinal axis is aligned with the tire radius line through the friction-wheel contact point
• In front view, and the pivoted-out position of its longitudinal axis generally parallel to the tire radius line. In this position, a gap between the friction wheel and tire casing is usually 6 to 10 mm (otherwise specified by the manufacturer ) to be observed.

Types

Traditionally, side runners Dynamos are on the bike mounted so that the free end of its mounting tab facing backwards ( rear facing), that is to say, the friction roller is located in front of the attachment point. This makes sense, since such a dynamo when he gets due to faulty suspension in the spokes jammed rare between fork and spokes and thus the risk of a fall is reduced. Dynamos are right suitable for such mounting on the right of the tire, they pivot to operate to the left against the tire. According to dynamo swivel left to right against the tire.

Comfort

Especially with simple dynamo to drive the additional force required is highly disturbing when the dynamo. With high-quality models, this effect is less pronounced: the exchange of a simple dynamo by a higher quality product can mean a significant gain in comfort.

Maintenance

In classical models, the friction roller can be replaced. The External Dynamo can be replaced with a simple bicycle tool, the use of corrosion-resistant screws ( galvanized, low-corrosion steels such as V2A ) the usual size M6 is appropriate.

Energy

Side rotor dynamos generate an AC voltage by means of a rotating permanent magnet and a fixed inductor. The chosen design, the otherwise necessary in rotating coil slip rings, which favors the operational safety. A special form represent the middle fork built dynamos that rub on the tread. Also in this design rotates the permanent magnet.

The circuit has previously been mostly connected via a wire and the bicycle frame as a ground contact, so that only one wire was visible. Today, the wiring on two cable sets by more and more. This is due to the use of electrically non-conductive frame components - for example, of plastics - as well as by the relevant passage of current through the bearings of the steering tube.