Electric power steering assembly and system with anti-rotation coupler

An electric powered steering assembly and system for a vehicle. A sensor is coupled to a housing for detecting input from a user, such as to a steering member. An electric motor is coupled to the housing and controllable by a computer module. The electric motor supplies an assistive torque to a steering shaft of the vehicle. A coupler couples the housing to a chassis of the vehicle. The coupler prevents rotational movement of the housing about the steering shaft while permitting axial movement of the housing along with the steering shaft. The coupler may permit relative movement between the housing and the chassis in five degrees of freedom. A mounting bracket may be rigidly connected to the chassis. The coupler may comprise a coupling bracket and a link having a spherical joint coupled to the mounting bracket. Methods of installation and operating electric powered steering system are also disclosed.