Patent ID: 6036456
Filing Date: 2000-03-14
Classification: F02M,F04D,F05D

Abstract:
An electrical air pump for use in apparatus for periodic cleaning of a charcoal canister and periodic checking of leak-tightness of a fuel tank system of an internal combustion engine in which the air pump is periodically turned on and off and reversed in pumping direction, said air pump comprising:an electric motor adapted for electronic control thereof,an air pump section,a housing joining said motor and pump section as a common system,said air pump section including a rotor, said motor including a stator system,said housing having a cylindrical wall defining a first chamber in which said stator system is received,a sealing cover engaged with said housing to seal said first chamber, said sealing cover including means for passage of electrical leads from said stator outside the electrical air pump,said air pump section including a pump cover sealingly engaged with said housing and defining therewith a second chamber,said rotor being of bell shape and rotatably supported in said second chamber,a pin secured in said housing and said pump cover, said rotor being rotatably supported on said pin,said housing having an end wall from which said cylindrical wall extends,said rotor being disposed with slight clearance adjacent to said end wall and projecting radially beyond said cylindrical wall of said housing, said rotor including a collar and a plurality of pumping blades extending radially from said collar into an annular channel of said second chamber,said pump cover including two connections, one for aspirating air and the other for discharging air under pressure, said connections being connected to said annular channel and angularly spaced from one another, said pump cover including a wall with a separating section disposed between said two connections.