Brushless electric motor for use as rotary drive for fuel pump, has clamping unit for clamping shaft against bearing, and ball arranged between spring and shaft for friction-less transmission of force between spring and shaft

摘要

The motor (1) has a stator (5) comprising a stator core (6), and a rotor (8) rotatably supported on a shaft (9) in an inner side of the stator. The shaft is radially supported in a slide bearing (10) at an opened end of a housing (2), and an axial bearing (11) i.e. groove-point bearing, is arranged at a free end of the shaft. A clamping unit clamps the shaft against the axial bearing, and a spiral spring (17) exerts axial force on the shaft. A ball (16) is arranged between the spring and the shaft for friction-less transmission of the force between the spring and the shaft.