Abstract: An electric power steering system includes a shaft coupling that drivably couples a worm gear to an output shaft such that the worm gear is tiltable with respect to the output shaft. The shaft coupling includes a fixing part coupled to the output shaft and a cylindrical part having an inner periphery in rectangular cross section and fixed to the fixing part. A coupling part that is inserted in the cylindrical part and that has an outer periphery in non-circular cross section, engageable with the inner periphery, is formed at a proximal end part of the worm gear, and the outer periphery is ridged such that gaps that allow the coupling part to tilt are provided inside the cylindrical part. Then, the cylindrical part presses an inner ring of the first rolling bearing toward an axially distal end side of the worm gear.

Abstract: It is an object of the present invention to provide a ball joint mount structure and a ball joint mounting method, which can distribute grease between an outer periphery of a shaft and a sliding contact surface of a lip while preventing the grease from being supplied into a mount hole. The inventive ball joint mount structure includes a grease retaining groove (55) provided in a portion of a lower surface (52b) of a knuckle arm (51) spaced a distance from a peripheral edge of a knuckle hole (53) for retaining grease (G). After a shaft (12) is inserted into the knuckle hole (53) to bring an upper end portion (5a) into contact with the lower surface (52b) with the grease (G) retained in the grease retaining groove (55), the ball stud (4) is fixed to the knuckle arm (51).

Abstract: A bearing apparatus to be supported by an axle box which includes a key groove, the bearing apparatus includes an outer ring which includes a first key groove extending from an inner diameter to an outer diameter of an axial end surface of the outer ring, an inner ring, rolling elements rollably interposed between the outer and inner rings, and a key member which includes an annular body, a first inwardly projecting part which is provided on the annular body and adapted to be inserted into the first key groove of the outer ring, and an outwardly projecting part which is provided on an outer periphery of the annular body and adapted to be inserted into the key groove of the axle box.

Abstract: An inspection point positional information acquisition step of acquiring thermal displacement positions of at least three inspection points set on a support member; an approximate curve calculation step of calculating an approximate curve of a deformed shape of the support member on the basis of the thermal displacement positions of the inspection points; a correction value calculation step of calculating a correction value for a command position of a movable member on the basis of the command position and the approximate curve; and a correction step of correcting the command position of the movable member using the correction value, are provided.

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 a ball screw device, a ball screw linear-movement member is screwed with a ball screw rotary member and configured to linearly move in accordance with a relative rotation with the ball screw rotary member. A housing is holding the ball screw rotary member. A motor is disposed in a motor chamber of the housing, and configured to rotate the ball screw rotary member with a rotor coupled to the ball screw rotary member. A stopper is configured to collide with a brake when an amount of a relative linear movement between the ball screw rotary member and the ball screw linear-movement member becomes no less than a prescribed amount. The brake is configured to decelerate rotation of the rotor by the collision of the stopper with respect to the brake.

Abstract: An angle calculator determines an angle of a rotor. An angular speed calculator determines an angular speed of the rotor. A command current calculator determines a command current defined on a dq-axis. An open loop controller determines a command voltage defined on the dq-axis in accordance with a circuit equation of a motor, based on the command current and the angular speed. A dq-axis/three-phase converter converts the command voltage into a three-phase command voltage. A resistance calculator and a ?-value calculator respectively determines circuit resistance including armature winding resistance and a number of armature winding linkages which are included in the circuit equation of the motor, based on temperature of the motor detected by a temperature sensor and with reference to a table or the like which is stored in advance.

Abstract: A resolver stator includes an annular first cover portion, an annular second cover portion, and a plurality of pillars. The first and second cover portions cover coils from both axial sides. The pillars couple the first and second cover portions, and are arranged between the adjacent teeth. Each pillar has circumferential side faces each of which has a radially inner end portion that is arranged with a labyrinth clearance left between the radially inner end portion and a radially inner end portion of the tooth next to the side face, and each of which is a concave curved surface so as to be further apart from the tooth from the radially inner end portion toward a radially outer end portion of the side face.

Abstract: A method for determining the absolute angular position of a steering wheel of an electric power-assisted steering column of a motor vehicle, including a means for measuring a dynamic parameter while the vehicle is running and including among others, the steps of periodically determining a multi-turn relative angular position, determining at least one dynamic parameter relating to the running conditions of the vehicle using the means for measuring said parameter, determining an absolute steering-wheel angle calculated according to at least one dynamic parameter, and weighting the calculated value of the absolute steering-wheel angle according to a test of the validity of the calculated value of the absolute steering-wheel angle and the origin of said value, in other words, the measurement means used to determine said at least one dynamic parameter.

Abstract: An annular recess is formed in a vehicle inner side of a wheel rolling bearing device. A protective cover is attached to an inner ring disposed in a bottom side of the recess to protect an annular magnetic encoder. A cover body of the protective cover is formed with an annular first disk portion covering the magnetic encoder, a cylindrical portion extending from a radial outer end of the first disk portion and fitted into an inner circumferential wall of the recess, and a second disk portion extending radially outward from an upper end of the cylindrical portion and covering the end portion of the outer ring located around the recess. The cover body is formed with a to-be-separated portion constituted by at least one of half-cut grooves and perforations extending in a radial direction of the cover body. The cover body is formed with lugs which are projected from the second disk portion.

Abstract: Disclosed is a covered member including a base material, a first intermediate layer that has a roughened surface and covers the base material, and a DLC film that covers the surface of the first intermediate layer. The first intermediate layer and the DLC film are formed in a state where the temperature of the base material is kept at 300° C. or lower. The surface of the first intermediate layer is roughened by collision of ions.

Abstract: A motor includes: a rotary shaft; a rotor that is provided on the rotary shaft so as to be rotatable together with the rotary shaft; a stator that is provided radially outward of the rotor; a housing that supports the stator; a resolver that has a resolver rotor rotatable together with the rotary shaft and a resolver stator radially facing the resolver rotor; and a resolver unit that is an assembly component including the resolver stator. The resolver unit includes a bearing that rotatably supports the rotary shaft and a case member that has a first fitting portion to which the resolver stator is fitted and a second fitting portion to which the bearing fitted and that is detachably connected to the housing. At least part of the resolver unit is arranged on a radially inner side of the rotor.

Abstract: A steering apparatus having a stationary bracket fixed to a vehicle body including a pair of first side plates; a receiving portion provided on the steering column for receiving one end of a conductive member; a pair of second side plates; a conductive cylindrical shaft secured between the pair of first side plates and inserted through the pair of the second side plates; and a plate-shaped conductive member interposed between the receiving portion and an outer peripheral surface of the cylindrical shaft. The conductive member includes first and second bow springs that fit the cylindrical shaft resiliently. The first bow spring is interposed between the second bow spring and the receiving portion, a first contact portion of the second bow spring is pressed to the outer peripheral surface of the cylindrical shaft, and a second contact portion of the first bow spring is pressed to the receiving portion.

Abstract: A wheel support apparatus including a hub wheel which includes a hub shaft and is to mount a wheel thereon, a first side surface spline being formed on an end surface of the hub shaft, and a constant velocity joint which includes an outer ring connected to the hub shaft in a torque-transmitting manner, a second side surface spline meshed with the first side surface spline being formed on an end surface of a side wall portion of the outer ring abutting against the end surface of the hub shaft. Each of the first and second side surface splines includes a number of spline teeth and bottom lands defined between the spline teeth. The tooth tops of the spline teeth of one of the two side splines and the bottom lands of the other side spline are formed into a tapering surface inclined relative to a plane perpendicular to a center axis of the hub shaft. The tapering tooth tops contact the corresponding tapering bottom lands so that the hub shaft and the outer ring can be aligned with each other.

Abstract: A transmission driving device that is capable of preventing displacement of a shift operation member or a select operation member in a case where there is reverse input in the shift operation member or the select operation member by inhibiting rotation of a rotation member which is released from an input shaft. When an input shaft and a first rotor are connected, the first electromagnetic coil is an excitation state and a second electromagnetic coil is in a non-excitation state. In this state, a second magnetic ring is not attracted to the side of the second electromagnetic coil, a seventh facing, which is fixed to the second magnetic ring, and an eighth facing are engaged with each other, and a second rotor and a casing are connected to each other. In a connection state of the second rotor and the casing, the second rotor cannot be rotated.

Abstract: A grinding wheel having a grindstone portion formed on a core includes slippery fluoroplastic coating films that prevent attachment of foreign matter, the coating films being provided on the portions of the core, with which portions the foreign matter can be brought into contact.

Abstract: In an electric power steering system, a motor drive controller that has an inverter circuit board and a control circuit board housed in a control case is provided so as to overlap a control case fixation surface formed at an end portion of a gear housing in the axial direction of a steering shaft, so that it is possible to reduce the projection in the axial direction of a motor as compared to the conventional one. In addition, a metallic board is used for the inverter circuit board and the inverter circuit board is fixed to the control case fixation surface so as to be in surface contact therewith, so that it is possible to efficiently dissipate the heat generated on the inverter circuit board into the gear housing and a fixation support plate.

Abstract: With a rack-and-pinion mechanism, an impact force is absorbed and reduction in assembling performance is suppressed. An annular fitting groove (51) that extends in the circumferential direction of a rack guide (41) is formed in an outer peripheral face (41a) of the rack guide (41), and an O-ring (52) is fitted in the fitting groove (51) in a state in which the axial movement of the O-ring (52) is restricted. A communication groove (61) that provides communication between an internal space (55), defined by the fitting groove (51) and the O-ring (52), and the outside of the rack guide (41) is formed in the rack guide (41).

Abstract: A tool clamping device includes: a tool holder having a two-face restraint portion constituted by a tool taper portion and a tool end surface; a spindle having a spindle taper portion facing the tool taper portion and a spindle end surface facing the tool end surface, wherein the tool holder is clamped to the spindle by performing an operation to pull the tool holder in toward the spindle; and a clamping unit housed in the spindle, wherein, when the tool end surface is in contact with the spindle end surface and the tool taper portion is fitted into the spindle taper portion, a gap is formed between the tool taper portion and the spindle taper portion.

Abstract: A cross shaft member has four shaft portions arranged in a generally cross-shape around an outer periphery of a body portion thereof, and a recessed portion is formed in the body portion, and has a depth in a direction perpendicular to a plane in which axes of the four shaft portions lie. Four ridge-like thickened portions are formed in the recessed portion, and are equally spaced from one another, and extend diagonally with respect to the axes of the shaft portions in the plane.