A core of a worm wheel has an axial end surface formed with a first annular recess nad and another axial end surface formed with a second annular recess. A rim portion has a first inner circumferential portion fixed to the first annular recess and a second inner circumferential portion fixed to the second annular recess. An outer circumferential wall surface of the second annular recess extends from a bottom surface of the second annular recess so as to be perpendicular to the bottom surface. A depth of the second annular recess is at least 0.1 mm but not deeper than half of a gate thickness.
WORM WHEEL AND ELECTRIC POWER STEERING APPARATUS
2015-12-10
Patent
Elektronische Ressource
Englisch