DE662278C - Magnet system for electric bicycle alternators - Google Patents

Description

GERMAN EMPIRE

ISSUED JULY 8, 1938

REICH PATENT OFFICE

PATENT LETTERING

CLASS 21di GROUP

Berko-Werke Quast & Eichert in Berlin *)

Magnet system for electric bicycle alternators

Patented in the German Empire on December 1, 1932

The invention relates to a magnet system for electric bicycle alternators, which is composed of profile bars made of magnetic steel and a yoke made of soft iron.
These magnet systems form a mass-produced article and must accordingly be simple to manufacture and inexpensive in terms of price. In addition, the handling when assembling the dynamo must be easy and the accuracy for obtaining high electrical and magnetic performance must be as great as possible. The invention achieves all of these general objectives.

The magnet system for electric bicycle alternators, which is made from profile bars Magnet steel and a yoke is composed of soft iron, has the invention a flap made of Isolierpreß- or injection molding material to hold the Profile bars with the yoke washer.

In a further inventive training, the yoke cap is also designed as a housing, thus, further simplifications and lower prices for this mass-produced item enter. By casting or pressing around the magnet system with insulating material becomes a permanent and permanent connection between the magnets and the insulated material Housing, so a structural unit, achieved. So it is not necessary to 'die To provide magnets and the yoke part with holes and to rivet these parts together. The magnets also form stiffening or reinforcing inserts for the housing made of insulating material. The resulting increase in strength is just for one Bicycle alternator as a result of the violent shocks that occur while riding and the per se rough handling when cycling is of crucial importance.

The invention also has the advantage of simplifying the electrical feedthroughs from Inside the housing to the outside, d. H. it who-. So the insulating washers and above all else the individual assembly of the many special parts is saved. But not just an increase in Strength is achieved by inserting the profile rods. The fixed connection of the magnets and the housing walls results in the assembly of the alternator in FIG. 5c Factory the greatest reduction in the price of production, since the time required for construction can be shortened significantly. But there are even greater advantages when using the alternator outside of the Workshop. Everybody is a layperson when it comes to cleaning that somehow turns out to be necessary enables the alternator to be taken apart and again easily after cleaning and assemble without difficulty. By potting or pressing together the magnets and the iso-

*) The patent seeker stated as the inventor:

Bernhard Siebert in Berlin-Britz.

liermaterial existing housing, it is possible for the housing to have thinner walls to use than before.

In the magnet system according to the invention, it is possible to reduce the air gap between the.

Magnetic rods and the armature keep lower, which turns the machine into electrical Relationship is improved.

The invention is based on exemplary embodiments explained, 'namely represent:

Fig. Ι a longitudinal section along the line i-i Fig. 2 through a magnet system, Fig. 2 a cross section along the line 2-2 of Fig. 1,

Fig. 3 is a longitudinal section along the line 3-3. of Fig. 4 by a four-pole magnet system,

Fig. 4 is a cross-section along the line 4-4 of Fig. 3.

In Figs. 1 and 2, 1, 1 represent the profile magnetic rods and 2 the yoke disk guiding the magnetic lines of force. Spray material existing yoke cap 3 held together. According to a further concept of the invention, the yoke cap 3 is extended upwards and designed as a cylindrical housing 3 ^e . On oberein the edge of the housing 3 ', the thread 3 ⁰ is advantageously arranged. In the bottom 3 ^{0 of} the yoke cap 3, the contact connection 5 is injected at the same time. In order to secure and hold the profile bars 1 in their position, rib or cam projections y are provided.

In a further embodiment of the invention, the hinge pin 4 is in the housing 3 ″ its disk 4 "injected.

A four-pole permanent magnet system is shown in FIGS. 3 and 4, which essentially corresponds to that shown in FIGS. In this exemplary embodiment, the profile rods 11 and the yoke sheet 12 made of soft iron form the actual magnet, which is held together by the yoke cap 13. In this example, too, the cylindrical edge of the yoke cap 13 ^{6 is} extended upwards and designed as a housing 13 *. For the purpose of better fastening of the profile bars n, ribs 13 'are provided.

The assembly of the magnet system, i.e. the profile bars 1, 11 and the yoke washer 2.12, and pushing over or reaching over the yoke cap 3, 13 can be carried out before or after the injection molding or pressing process advantageously, of course, during the pressing process. In order to avoid longitudinal displacements of the profile bars can the same by machining on the outer curved surface or advantageously on the straight narrow side with grooves and notches 3 * into which the insulating material can use, whereby a longitudinal displacement is prevented.

Claims (2)

Patent claims: - ■ - 1. Magnet system for electric bicycle alternators, which is composed of profile bars made of magnetic steel and a yoke made of soft iron by means of a cap (3, 13) made of insulating pressed or injection-molded material for holding the profile bars (1, 11) together with the yoke disk (2.12). 2. Magnet system according to claim 1, characterized in that the cap (3, 13) is designed as a housing (3 * · ', iy) . 1 sheet of drawings