Commutator
AssigneeRobert Bosch GmbH
InventorsRalf Schmidt, Martin Kiefer
Life of this patent
Estimating the term…
Abstract
When a commutator is slipped onto a rotor shaft that is provided with viscous epoxy, a bead of epoxy forms on the connecting end face of the commutator core and can hinder the process of winding the rotor. The novel commutator therefore has a receiving bore (25), which begins at the connecting end face (23) of the commutator and extends coaxially to the longitudinal axis (1) as far as a shoulder (26) and is adjoined by a conical bore (29) tapering toward a through bore (24). The bead (22) of epoxy that forms when the commutator is slipped onto the rotor shaft is completely covered by the receiving bore (25). The commutator is especially suitable for rotors of electrical machines.
Claims6
A commutator for an electrical machine that has a rotor with a rotor shaft, comprising a cylindrical commutator core of a thermosetting plastic, an axial through bore in said cylindrical commutator core for slipping said commutator core onto the rotor shaft, a connecting end face (23) of said core extending transversely to the through bore, wherein a receiving bore (25) of a greater diameter than said through bore originates at the connecting end face (23) in the commutator core (27) coaxially to the through bore (24) and extends as far as a shoulder (26), and a conical bore (29) adjoins the shoulder (26) with a lesser diameter than that of the receiving bore (25) and said conical bore tapers toward the through bore (24), said through bore (24) has a non-interference fit relative to the circumference of the rotor shaft (2) and for better fixation of the commutator (7) on the rotor shaft (2), at least one indentation (32, 32′) is provided on the commutator core (27), said at least one indentation (32, 32′) is open in a direction to the receiving bore (25).
Dependencies are inferred from the claim text.