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AssigneeFriedrich Nettelhoff Kommanditgesellschaft Spezialfabrik fuer Kleinkollektoren
InventorFriedrich W. Nettelhoff
Estimating the term…
For electric motor collectors with lamella inner cross members, which serve for anchoring the individual lamellas, protrude inwards running at least predominantly parallel to the collector axis and are provided with undercut surfaces, which are to be grasped from behind by reinforcing rings. Reinforcing rings are proposed which, aside from a metallic clamping ring, comprise a supporting ring, which is fitted positively into the metallic clamping ring and forms a double body with the clamping ring and is formed from a material, which is resistant to compression and insulating even at high operating temperatures. With this, reinforcing rings are produced from two partial rings, which are easily manufactured and easy to press together, or by the supporting ring which is brought into the clamping ring by injection molding. The reinforcing rings form a unit which can withstand extremely high thermal and mechanical stresses and imparts the collector with very high stability under load and fatigue endurance.
A unitized ring means for an electric motor collector having a collector axis and individual lamellas having lamellar inner cross members which secure said individual lamellas and wherein the cross members project outwardly and extend generally parallel to said collector axis and wherein the cross members have undercut faces which are adapted to receive said unitized ring means, said unitized ring means comprising a metallic clamping ring and an insulating supporting ring on the inner surface of said clamping ring, said metallic clamping ring and said insulating supporting ring having a pre-tensioned relationship such that said metallic clamping ring and said insulating supporting ring are joined solidly together as a unit by said pre-tensioned relationship, said unitized ring means being disposed on said cross members such that said supporting ring faces said undercut faces, said supporting ring comprising a material which is compression-resistant and insulating effective at high operating temperatures.
A collector for an electric motor comprising copper lamellas, said lamellas having inner cross members having undercuts which form extensions, a unitized ring means disposed about said extensions, unitized ring means comprising an outer metallic clamping ring element disposed about an inner insulating supporting ring element, said metallic clamping ring element and said insulating supporting ring element having a pre-tensioned relationship such that said metallic clamping ring element and said insulating supporting ring element are joined solidly together as a unit by said pre-tensioned relationship, said insulating supporting ring element having an inner side facing said extensions, said insulating supporting ring element comprising a material which is compression-resistant and insulating effective at high operating temperatures, and an insulating carrier of synthetic resin molding compound disposed about said extensions and about said unitized ring means.
A collector for an electric motor comprising copper lamellas, said lamellas having inner cross members having undercuts which form extensions, a ring means disposed about said extensions, said ring means comprising an outer metallic clamping ring element disposed about an inner insulating supporting ring element, said extensions defining a cylindrical extension surface, said clamping ring element having an inner cylindrical surface spaced radially outwardly of said cylindrical extension surface, said supporting ring element being disposed between said cylindrical extension surface and said inner cylindrical surface of said clamping ring, said inner cylindrical surface of said clamping ring element having an annular groove, said cylindrical extension surface having a notch, said supporting ring element having a generally circular cross section and being disposed in said annular groove and in said notch to thereby fix said supporting ring element in a fixed axial position between said cylindrical extension surface and said inner cylindrical surface of said clamping ring, said supporting ring element comprising a material which is compression-resistant and insulating effective at high operating temperatures, and an insulating carrier of synthetic resin molding compound disposed about said extensions and about said ring means.
Dependencies are inferred from the claim text.