Cover member and housing assembly for electric power steering device

The utility model relates to a cover part and a shell assembly for an electric steering device. The cover part comprises a cover main body, a cover body and a cover body, a first rib pattern disposed on an inner surface of the cover body and having a first thickness; and a second rib pattern disposed on an inner surface of the cover body along an outer periphery of the first rib pattern and having a second thickness thicker than the first thickness, whereby a beneficial effect of reducing vibration and noise can be achieved. 本实用新型涉及一种盖部件及电动转向装置用壳体组件，该盖部件包括：盖主体；第一肋图案，设置在盖主体的内表面，并具有第一厚度；第二肋图案，沿着第一肋图案的外周设置在盖主体的内表面，并具有比第一厚度厚的第二厚度，由此能够起到减小振动和噪音的有益效果。