Abstract: A rack assist type electric power steering system has a durable and simplified structure with reduced parts and has an improved productivity, so as to reduce the manufacturing cost thereof and remarkably reduce an assembling difficulty thereof.

Abstract: An electric power steering apparatus includes a pinion shaft coupled to a steering wheel shaft, a rack shaft coupled to the pinion shaft and having a ball screw, a ball nut provided in the ball screw through a plurality of balls, a first pulley coupled to the ball nut, a torque sensor sensing steering wheel torque, an electric motor for generating a steering assisting force according to the torque sensor signal, a second pulley at one end of the electric motor, and a belt connecting the first pulley to the second pulley to transmit the steering assisting force to the ball nut. The first or second pulley have a coating including 10 to 90 wt % molybdenum sulfide, 5 to 10 wt % antimony trioxide, 1 to 5 wt % antirust agent, 1 to 5 wt % auxiliary lubricant, and 1 to 3 wt % organic adhesive in a 1 to 10 wt % solvent.

Abstract: The present invention relates to an electric power steering apparatus using a coated pulley.

Abstract: A torque sensor for automobiles capable of maintaining initial fabricated positions of components in a housing even though being subjected to thermal expansion or external shock is disclosed. Retaining elements made of resilient material having excellent damping capability are interposed between an inner surface of a housing and each of detection coil assemblies by molding process to enable the components received in the housing to be securely held. Though being subjected to external vibration or shock, the external effect can be absorbed by damping effect of the retaining elements. Though the components in the housing thermally expand due to temperature variation, the retaining elements are elastically deformed to accommodate volume increase by the thermal expansion. Since fabricated positions of the components can be securely maintained without axial and radial displacement, it is possible to precisely detect torque acting on a torsion bar.