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AssigneeToyota Jidosha Kabushiki Kaisha
InventorNobuyoshi Sugitani
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To construct an electric power steering device in which the assist power decreases only the torque required for rotating the steering wheel, while the control of the steering angle of the steered wheels follows basically the rotation of the steering wheel by the driver, except when the steering angle of the steered wheels is changed by an actuation of a vehicle behavior control device, by a tie rod connecting bar supported to make a linear motion, a rotary member rotatable around the tie rod connecting bar, a rotation conversion device for converting a rotation of a steering shaft to a rotation of the rotary member, a rotation/linear motion conversion device for converting a rotation of the rotary member to a linear motion of the tie rod connecting bar, and a power assist electric motor to give a rotational force to the rotary member.
An electric power steering device for vehicles comprising a tie rod connecting bar supported to make a linear motion, a rotary member rotatable around the tie rod connecting bar, a rotation conversion device for converting a rotation of a steering shaft to a rotation of the rotary member, a rotation/linear motion conversion device for converting a rotation of the rotary member to a linear motion of the tie rod connecting bar, and a power assist electric motor to give a rotational force to the rotary member, wherein the rotation/linear motion conversion device is a planetary gear device including a ring gear, a sun gear, a planetary pinion and a carrier supporting the planetary pinion, and in the correspondence between pitch diameters and thread numbers of the ring gear, the sun gear and the planetary pinion the thread number of either the ring gear or the sun gear is increased or decreased so that thereby an axial displacement is generated between the ring gear and the sun gear when the ring gear rotates around the sun gear with a planetary motion of the planetary pinion.
An electric power steering device for vehicles comprising a tie rod connecting bar supported to make a linear motion, a rotary member rotatable around the tie rod connecting bar, a rotation conversion device for converting a rotation of a steering shaft to a rotation of the rotary member, a rotation/linear motion conversion device for converting a rotation of the rotary member to a linear motion of the tie rod connecting bar, and a power assist electric motor to give a rotational force to the rotary member, wherein the rotary member incorporates therein a differential mechanism including an input rotary member driven by the rotation conversion device, an output rotary member to drive the rotation/linear motion conversion device, and an intermediate rotary member to variably adjust relative rotation between the input rotary member and the output rotary member, and an active steering is conducted by variably adjusting a rate of conversion of a rotation of the steering shaft to a linear motion of the tie rod connecting bar according to a rotational displacement of the intermediate rotary member.
Dependencies are inferred from the claim text.