Robert Boschgmbh

Martin Kiefer

Klaus Maldener

Ralf Schmidt

Lothar Fauth

Hans Kobschaetzky

Martin Wiesler

Dieter Kern

Thomas Kotlarski

Uwe Hammer

Wilfried Aichele

Hans-Joerg Fees

Helmut Aesche

Danny Leerkes

Sungbae Park

Gordy Koellmann

Gijs Olde Loohuis

Xiaochuan Pian

In rotors for electric motors, it is usual to fix the commutator on the rotor shaft by means of a press fit. In the present invention, the rotor shaft, with the rotor core fixed thereon, is electronically coated with an epoxy layer on opposite portions of the rotor shaft and in the winding slots, and is then heated on the plasticizing and curing temperature of the epoxy. After that, with the help of a sliding temperature, the commutator, whose inner bore has a clearance fit relative to the rotor shaft, is slipped onto the rotor shaft in a terminal position, in the process the still-viscous epoxy is pushed backward and is deposited radially on a connecting end face, forming a bead, and penetrates the annular gap between the inner bore and the rotor shaft. Once the epoxy layer has cooled, the commutator is fixed against rotation and displacement on the rotor shaft. The rotor is suitable for electric motors of various types.

Method of producing a rotor

A process for fixing a rotor winding, which is hooked to connection lugs of commutator lamellas of a commutator in the vicinity between the connection lugs and winding heads that are embodied on the end face of the rotor body. In order to simplify the process, a shrink sleeve is placed over the commutator of the completed rotor and is slid onto the winding heads until the connection lugs and the connection wires of the rotor winding that extend to the connection lugs are covered. The mechanically fixed shrink sleeve is homogeneously heated with hot air while the rotor rotates so that after cooling, the shrink sleeve shrinks onto the connection lugs and connection wires as well as onto parts of the winding heads.

Process for fixing a rotor winding

Commutator

A rotor for an electric motor includes a commutator and a rotor shaft with a rotor winding that is contained in a rotor body supported on the rotor shaft in a rotationally fixed manner. The commutator has commutator lamellas that are disposed axially next to one another in the circumference direction with an insulation gap and have connection lugs for attachment of connecting wires of the rotor winding. In a region between the commutator and the rotor body, an additional winding is wound around the connecting wires in order to fix or stabilize the connecting wires. The rotor is provided for electric motors used in vehicle construction.

Rotor for an electric motor and process for manufacturing the rotor

The proposed support element (,) for a wiper strip (,) of rubber-elastic material belonging to a wiper blade (,) for motor vehicle windshields is fastened to the underside (,) of the elongated springing-elastic support element (,) facing the windshield so as to be parallel to the longitudinal axis, wherein this support element (,) is produced through the use of woven fiber material that is impregnated with a reaction mixture. A particularly simple and economical production of the support element (,) is possible when this support element (,) is produced entirely from the fiber material impregnated with the reaction mixture.

Supporting element for a wiper blade belonging to a windscreen wiper in a motor vehicle

In rotors for electric motors, it is usual to fix the commutator on the rotor shaft by a press fit. In the present invention, the rotor shaft, with the rotor core fixed thereon, is electrostatically coated with an epoxy layer on opposite portions of the rotor shaft and in the winding slots, and is then heated to the plasticizing and curing temperature of the epoxy. After that, by a sliding tool, the commutator, whose inner bore has a clearance fit relative to the rotor shaft, is slipped onto the rotor shaft in a terminal position, in the process the still-viscous epoxy is pushed backward and is deposited radially on a connecting end face, forming a bead, and penetrates the annular gap between the inner bore and the rotor shaft. Once the epoxy layer has cooled, the commutator is fixed against rotation and displacement on the rotor shaft. The rotor is suitable for electric motors of various types.

Growing community of inventors

Oberkirch, Germany

Martin Kiefer