| abstract |
PROBLEM TO BE SOLVED: To provide an electric power steering device in which a sliding portion between a rack and a pinion is lubricated by a lubricating grease capable of exhibiting sufficient durability performance even under more severe conditions. An electric motor 4 that outputs a steering assist force to the steering mechanism in response to the operation of the steering mechanism, a controller 6 that controls the electric motor 4, and a rack housing 32 that is movably installed inside the rack. 35, a rack bar 33, and a rack housing 32 rotatably supported via a bearing 34 and a pinion 31 that meshes with the rack 35 formed on the rack bar 33. The rack 35 and the pinion The sliding part having 31 is lubricated by a grease composition, and this grease composition is an electric power steering device containing a compound containing sulfur element in the molecular structure as an additive. [Selection] Figure 1 |