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US 4,845,393 AGranted
Radio frequency suppression for fuel pump
OwnerJames P. Burgess, Harold Moyinventors
Life of this patent
Estimating the term…
Abstract
An end cap for a fuel pump provides suppression of radio frequency noise generated by the motor of the pump. The end cap includes radio frequency suppression circuitry disposed therewithin and is configured so as to be a direct replacement for conventionally utilized end caps.
Claims18
A unitary, radio frequency suppression system for a fuel pump, said system comprising:
- a radio frequency noise suppression circuit interposed between the fuel pump motor and the power supply for the motor, said circuit including at least one radio frequency choke coil interposed in series with the power supply and the motor, and at least one capacitor interposed in parallel with the motor and power supply and operative to pass direct or low frequency current to the motor while blocking the flow of radio frequency energy generated by the motor;
- a pair of motor brushes in electrical communication with said noise suppression circuit and disposed to establish sliding electrical contact with the armature of the pump motor;
- and
- a housing configured as an end cap of the fuel pump and further configured to support and retain said circuit and brushes in a predetermined spatial relationship therewith, said housing including (1) a pair of terminals which provide electrical communication between the power supply and the noise suppression circuit and (2) a discharge outlet for the pump, whereby said system combines end cap function and noise suppression function in a single, compact unit.
1 more element
An end cap for a fuel pump including therein a unitary radio frequency suppression system, said end cap comprising:
- a radio frequency noise suppression circuit including (1) a first and second choke coil, said coils each having a ferromagnetic slug disposed therein, and (2) a capacitor having a first plate thereof in electrical communication with a first one of said coils and a second plate thereof in electrical communication with the second one of said coils, said circuit operating to pass low frequency or direct current energy therethrough so as to energize the electric motor of the fuel pump and to block the flow of radio frequency energy produced by the motor;
- said system further including:
- a first motor brush in electrical communication with a second choke coil, said brushes operative to provide sliding electrical contact with the armature of the motor;
- and
- a housing configured to support and retain said circuit and brushes in a predetermined relationship, said housing including a connector housing having a pair of contacts disposed to provide electrical communication with each of the coils and a discharge outlet in mechanical communication with the fuel pump and configured to provide for the flow of fuel therethrough.
2 more elements
Dependencies are inferred from the claim text.