Brakes – Operators – Electric
Patent
1986-10-17
1988-01-12
Butler, Douglas C.
Brakes
Operators
Electric
188 721, 188163, F16D 5902, H01F 716, H02K 7102
Patent
active
047185236
DESCRIPTION:
BRIEF SUMMARY
The invention concerns magnet bodies and is based on the conventional magnet bodies with excited coils of direct current situated on the second shaft end of engines and similar drives, etc., which magnet bodies are directly secured to the engine flange with a spacer, or adjusting pieces, and with bolts. Those magnet bodies have, for instance, the assembly instruction sheet 3/83 of K. E. Brinkmann GmbH, D-4924 Barntrup or H.L.E. 14.438/9.79/65 of H. Lenze KG, D-4923 External.
The hitherto known magnet bodies are made as massive one- or two-piece rotary parts, which have in the half section a U shape opened toward the armature disk, the interior space of which accommodates the excitable coil circularly wound on a plastic support, for instance. Thus, the outer and inner legs of the U shape built axial pole surfaces and the magnetic short circuit takes place via the rear end of the U shape of the magnet body. Between the magnet body and the engine flange, a non-rotationally but axially movably armature disk is provided that covers with an air gap the open side of the U shape, in the currentless state, and against which abut springs firmly supported on the housing on the magnet side so that the armature disk in the currentless state is compressed by spring tension against a friction disk that rotates with the engine shaft. The use of those brakes is not directly confined to attachment to electroengines, and they also can be similarly used on shafts of other drives.
However, in mass production, the prior known design for the magnet bodies still has not proven satisfactory enough in saving expenses and material:
In the first place, the production of the magnet body as a cast or pressed part generally still has to be refinished, which represents an expense factor of considerable importance.
Besides, it was seldom possible, with the usual means, to keep the dimensions of the coil accurate enough in order to ensure reliably correct fastening in the U shaped interior space of the magnet body, without further assembly aids or securing devices.
The placing of many loose spacer pieces, to be inserted, also caused many assembly difficulties during the mounting of the brakes.
Furthermore, in the types of magnet bodies known already, the demands for high electric safety can only be met by additional expenses.
The closed annular structure of the magnet body likewise made a special opening and special seals or insulations necessary for introduction of the cable.
The problem to be solved by the invention is to find a magnet body construction in which the above disadvantages can be avoided or reduced without impairing the operation, and the production cost can be definitely lowered by means of manufacturing processes favorable to mass production.
The solution of this problem is obtained by the fact that the conventional closed annular shape of the pole surfaces and reflux cross sections coordinated with the armature plate has been abandoned, but still preserving the annular size and changing the direction of individual cross sections arranged more favorably for production so it can finally again have the total magnetic cross section required.
Hereby it is possible, with stamping or cutting tools, to obtain the iron parts from sheet metal or flat material with only minimal production working surfaces, instead of expensive molding box parts for casting or pressing processes.
A very precise production has further become possible, including prior assembly expenses for instance, by the double use of the plastic shell as a support for the individual parts of the side legs. Those parts can here be attached both during the production of the winding and at the final assembly.
The safe inclusion of the spacer pieces in the plastic shell makes the production and the assembly easier.
Besides, the danger of damages to the winding in the final assembly is practically eliminated and the electric safety is in general considerably improved.
Thus, the cable no longer has to be radially brought out through a bore in the ring of the magnet body a
REFERENCES:
patent: 3198293 (1965-08-01), Mathews
patent: 3465862 (1969-09-01), Birdsall
patent: 3730317 (1973-05-01), Jaeschke
patent: 3734245 (1973-05-01), Hubbard
patent: 4033438 (1977-07-01), Wiltsey
patent: 4228874 (1980-10-01), Brinkmann et al.
patent: 4235311 (1980-11-01), Brinkmann et al.
Lenze Extertal Literature printed in Germany by Lemhoefer, Hameln/HLE 14.438/9.79/6 5 4 3 2.
Schneider Rudolf
Winkelmann Siegfried
Butler Douglas C.
Zahnradfabrik Friedrichshafen AG
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