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Electric motor commutator

  • US 5,925,962 A
  • Filed: 05/05/1998
  • Issued: 07/20/1999
  • Est. Priority Date: 12/19/1995
  • Status: Expired due to Term
First Claim
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1. A commutator for an electric motor of a fuel pump which comprises:

  • an annular ring of sintered carbon having a planar front face and a back face, a conductor ring embedded in the carbon ring between and spaced from the front and back faces of the carbon ring prior to sintering the carbon ring and having a plurality of circumferentially spaced apart tangs adjacent the outer periphery of the carbon ring forming electrical connectors and a plurality of mounting projections which are circumferentially spaced apart, disposed radially inward of the tangs and project generally axial outwardly of the back face of the carbon ring, the conductor ring being securely attached to and bonded in the carbon ring by sintering of the carbon ring and its tangs electrically connected with the carbon ring, a housing of an electrically insulating plastic material molded over the back face of the carbon ring after sintering of the carbon ring and with the mounting projections of the conductor ring embedded and interlocked in the housing, the housing having a bore coaxial with the carbon ring, and a plurality of equally circumferentially spaced apart grooves extending radially and axially completely through the carbon ring and the metal conductor ring and forming a plurality of spaced apart separate sintered carbon segments each with a separate electrical conductor embedded and bonded therein by sintering to serve as commutator segments for contact with brushes with the grooves being formed only after the carbon ring has been sintered and after the housing has been molded onto the back face of the carbon ring to permanently fix and secure each of the carbon segments to the housing.

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