Abstract: A rolling bearing has a metallic member sealing member at one axial end thereof. The sealing member has a first cylinder section including a first cylinder section facing surface which is in contact with an outer peripheral surface of an inner ring, a second cylinder section connected to the first cylinder section and including a second cylinder section facing surface which faces the outer peripheral surface of the inner ring, and a flange section connected to the second cylinder section via a bend section. In a state before the sealing member is press fitted in the bearing, a radial position of the second cylinder section facing surface is closer to the flange section than a radial position of the first cylinder section facing surface. The rolling bearing has another metallic member sealing member at another axial end thereof.

Abstract: An electric power steering system calculates a motor resistance Rm using a resistance map, and calculates an estimated inducted voltage based on a motor current and a motor voltage. If the estimated induced voltage is determined as being equal to or smaller than a determination value that is set in accordance with the current level, the electric power steering system calculates a motor resistance (estimated motor resistance Rma) and updates the resistance map based on the estimated motor resistance Rma.

Abstract: A resolver includes: a resolver rotor attached to a rotational shaft; an annular resolver stator that is provided on a radially outer side of the resolver rotor and that has a plurality of teeth each opposed, across a clearance, to an outer peripheral face of the resolver rotor and circumferentially arranged at given intervals; and a case member having a cylindrical fit portion to which an outer peripheral face of the resolver stator is fitted. At least three protrusions, each protruding radially outward, are formed at given circumferential intervals on the outer peripheral face of the resolver stator, so that the outer peripheral face of the resolver stator is press-fitted to an inner peripheral face of the fit portion at positions at which the protrusions are formed.

Abstract: An inverter energy consumption calculating portion estimates the actual power consumption of a steering operation assist motor after an engine is placed in an idle-stop state, and a command value of current to be supplied to the steering operation assist motor is limited such that the command value is smaller as the energy consumption is larger. The inverter energy consumption calculating portion calculates the energy consumption of an inverter drive circuit by integrating an amount of electric power consumed by the drive circuit.

Abstract: A steering angle detection device includes: a shaft angle detector that detects a rotation angle of a shaft that transmits a rotation operation of a steering member to a steering mechanism; a motor angle detector that detects a rotation angle of a motor that applies a steering assist force to the steering mechanism; a steering angle calculation unit that calculates a steering angle on the basis of a combination of the rotation angle detected by the motor angle detector and the rotation angle detected by the shaft angle detector, and a temperature detector that detects an ambient temperature of the steering mechanism, wherein the steering angle calculation unit corrects the rotation angle detected by the motor angle detector or the shaft angle detector on the basis of the ambient temperature detected by the temperature detector and uses the corrected rotation angle to calculate the steering angle.

Abstract: When a source consisting of series-connected battery 7 and auxiliary power supply 9 supplies an electric power to a motor 4, a MOS-FET 13 for preventing a current induced by a voltage of the auxiliary power supply 9 from being reversed upstream should be off if it operates normally. Therefore, voltages at the opposite terminals of the MOS-FET 13 should have a difference which corresponds to a voltage of the auxiliary power supply 9. Hence, the voltages at the opposite terminals of the MOS-FET 13 are detected by two voltage detectors 23 and 25 when the electric power from the auxiliary power supply 9 is supplied to the motor 4. If the potential difference between the voltages at the opposite terminals of the MOS-FET 13 is equal to or less than a predetermined value, a control circuit 24 issues a failure signal upon determination that the MOS-FET 13 suffers a short-circuit fault. A MOS-FET 15 is also monitored in the same way.

Abstract: An electromagnetic valve includes: a valve main body including an inlet and an outlet of a fluid; a valve body to be seated on a valve seat provided between the inlet and the outlet; a movable iron core separating the valve body from the valve seat to communicate the inlet with the outlet; and a fixed iron core attracting the movable iron core by energization of a coil to axially drive the movable iron core. The valve main body includes an insertion hole into which a guide member is inserted and a stopper portion to stop the guide member biased by a pressure of the fluid. The guide member includes a sliding hole in which the movable iron core is axially movable, and is arranged in the insertion hole in a slidable manner with respect to the valve main body to be biased by the pressure of the fluid.

Abstract: The invention relates to a power steering system in which the set value for torque or force at the steering wheel is predetermined on the basis of various parameters and information so as to provide the most driving comfort in all conditions of driving the vehicle. The torque or force set value is predetermined on the basis of the sideways acceleration of the vehicle, the acceleration in turn being predetermined mainly from an estimate of the force exerted on the rack, and preferably also predetermined by other methods, with the estimate being weighted among all of the obtained values. Said method is particularly useful for vehicles provided with electrical power steering.

Abstract: An angle calculation portion of a motor control apparatus determines an angle ? of a rotor, and an angular velocity calculation portion determines an angular velocity ?e of the rotor. A command current calculation portion determines command currents id* and iq* on dq axes, based on a steering torque T and a vehicle speed S. An open-loop control portion determines command voltages vd and vq on the dq axes based on the command currents id* and iq* and the angular velocity ?e, according to circuit equations of a motor. A dq-axis/three-phase conversion portion converts the command voltages vd and vq to command voltages of three phases. A three-phase voltage correction portion corrects the command voltage so that an actual time average value of a voltage applied to each phase is equal to a time average value of a voltage that is to be applied to the phase if the voltage is not decreased, in order to compensate for a decrease in the applied voltage.

Abstract: A bearing apparatus includes two split outer ring halves disposed in close contact with each other and a plurality of rollers. A circumferential end of each of the split outer ring halves has a concave-and-convex shape including a first slope portion inclined with respect to a line extending along an axial direction of the split outer ring halves and a second slope portion inclined in an opposite direction to that of the first slope portion. Each of the rollers is provided with crowning so as to be shaped in barrel form, and an amount of crowning is set such that an apex of a projecting portion at the concave-and-convex shape of each of the split outer ring halves is located on an axially outer side of a rolling surface of the roller rolling on an inner peripheral surface of each of the split outer ring halves.

Abstract: In an electric power steering system, a ball screw nut (23) of a ball screw device that drives a rack shaft is screwed to an axial end portion (6a) of a motor shaft (6) when a threaded portion (31) of a hollow threaded shaft (30) formed at an axial end portion (23a) of the ball screw nut (23) is screwed to a threaded portion (32) formed in the inner periphery of a motor shaft (6). A flange member (33) that is larger in diameter than the ball screw nut (23) is fitted to the outer periphery of the axial end portion (6a) of the motor shaft (6). The flange member (33) is formed in such a manner that when the rotation of the flange member (33) is restricted, the rotation of the ball screw nut (23) and the motor shaft (6) in the same direction is restricted when the ball screw nut (23) is screwed to the motor shaft (6).

Abstract: A disc spring is provided between a ball screw nut and a hollow shaft, and another disc spring is provided between rolling bearings and a housing. When leftward motion of a screw shaft is stopped and a rotational inertia force is applied to the ball screw nut, these disc springs allow the ball screw nut to rotate to a certain degree.

Abstract: A torque limiter includes a shaft member 1, a cylinder member 2, and a traction oil. The shaft member 1 has an outer circumferential surface 20, and the cylinder member 2 has an inner circumferential surface 21 which is to be frictionally coupled to the outer circumferential surface 20 of the shaft member 1 during torque transmission. The traction oil is interposed between the outer circumferential surface 20 of the shaft member 1 and the inner circumferential surface 21 of the cylinder member 2.

Abstract: In a wheel rolling bearing device, where a pitch diameter of the inner-row ball set is D1 and a pitch diameter of the outer-row ball set is D2, D1 and D2 are set so as to satisfy the relationship “D1<D2”. Where an angle of a raceway circular arc from an intersection point of each inner-row ball with the inner-side outer ring raceway surface at a contact angle to a boundary portion of an inner-side raceway shoulder is ?1 and an angle of a raceway circular arc from an intersection point of each outer-row ball with the outer-side outer ring raceway surface at a contact angle to a boundary portion of an outer-side raceway shoulder is ?2, ?1 and ?2 are set so as to satisfy the relationship “?1<?2”.

Abstract: A ball joint and production method thereof that ensure that grease retainers are provided on the entire contact surface of a resin sheet between an outer surface of a round head of a ball stud and the contact surface to properly maintain lubrication between the round head and the resin sheet. Graphite particles are dispersed over an inner surface of the resin sheet, and the resin sheet and the round head of the ball stud are inserted in a housing. An open end portion of a housing body is swaged to be reduced in diameter. The graphite particles are pressed against the inner surface of the resin sheet, whereby portions of the inner surface of the resin sheet against which the graphite particles abut are depressed. Thus, gaps are formed around the respective graphite particles. Grease enters the gaps, which each function as a grease retainer.

Abstract: An electric power steering device includes a metallic housing, a steered shaft, an electric motor, a ball screw device, a rolling bearing, elastic members, and a plain bearing. The plain bearing is provided between the housing and an outer ring of the rolling bearing, and formed from a resin material.

Abstract: A gear pair includes a small-diameter conical involute gear having a conical angle, and a large-diameter conical involute gear having a conical angle. The small-diameter conical involute gear and the large-diameter conical involute gear are constituted by an aggregate of imaginary cylindrical gears.

Abstract: A sensor is placed in proximity to a chain of a continuously variable transmission, and a pulse is output by detecting pins. Moreover, there is provided a control section that determines theoretical speed of the chain from numbers of input and output rotations of the continuously variable transmission; that determines actual speed of the chain from an output from the sensor; that determines slippage from the speeds; and that controls clamping force of the continuously variable transmission so as to make slippage close to a reference value.

Abstract: When determining that a vehicle is not skidding, the ECU carries out tight corner control if vehicle speed is smaller than the upper limit value of the vehicle speed range corresponding to the starting state of the vehicle and the steering wheel turning angle of a steering wheel is greater than or equal to the minimum value of the steering wheel turning angle at which the tight corner braking phenomenon may occur. When determining that the vehicle is skidding, the ECU inhibits the tight corner control even if the vehicle speed is smaller than the upper limit value and the steering wheel turning angle is greater than or equal to the minimum value of the steering wheel turning angle at which the tight corner braking phenomenon may occur.

Abstract: This sealing device has an annular metal core portion and an annular elastic portion. The elastic portion has a thick portion and a thin portion which extends from the thick portion in an axial direction of the elastic portion and has a thinner thickness in a radial direction than the thick portion. A fixed lip is provided on an inner peripheral surface of the thick portion, and a sliding lip is provided on an inner peripheral surface of the thin portion.