Abstract: In an electric power steering system providing steering assist by applying a power of an electric motor to a steering mechanism via a reduction mechanism, the steering mechanism extending from a steering member to dirigible wheels, a grease (viscous material) is applied to a meshing engagement portion between teeth portions disposed on a motor-power transmission path extending from the electric motor to the steering mechanism via the reduction mechanism, the grease having a viscosity constant C satisfying 0.8 J?p?C where J denotes the inertia of the electric motor, and cop denotes the resonant angular frequency of the steering mechanism including the electric motor and the reduction mechanism. This provides for the prevention of the occurrence of rattling noises caused by a vibration system including the reduction mechanism and the electric motor and the degradation of the steering feeling.

Abstract: A resin pulley is provided in which, in particular, abrasion resistance in a dusty atmosphere and thermal shock resistance are superior and belt attacking property is suppressed. A resin composition including 35 to 55 mass % of a phenolic resin as a base resin, 1 mass % or more of an acrylonitrile butadiene rubber, 10 to 25 mass % of an inorganic fiber and 3 to 15 mass % of an inorganic powder, and further comprising a polyester acrylate, and a resin pulley formed with the use of the resin composition.

Abstract: Meshing surfaces are formed on the tooth surfaces of the teeth of a fixed side internally toothed gear, and positions of the meshing surfaces match with a track formed by addendum edges of teeth of a flexible externally toothed gear that moves with rotation of a wave generator. In the same manner, meshing surfaces are formed on the tooth surfaces of the teeth of a movable side internally toothed gear, and the positions of the meshing surfaces match the track formed by the addendum edges of the teeth of the flexible externally toothed gear that move with the rotation of the wave generator.

Abstract: A grinding machine enabling the easy maintenance and inspections of mechanisms arranged therein, an increase in visibility when the states of a workpiece and a grinding wheel are confirmed, and the easy loading/unloading of the workpiece and the easy replacement of the grinding wheel. The grinding machine comprises a workpiece supporting/driving device, a wheel work head, a wheel head feeder, a coolant supply unit, a cover covering internal devices such as the workpiece supporting/driving device, the wheel work head, the wheel head feeder, and the coolant supply unit, and an open/close door formed at a part of the working space side upper surface of the cover and allowing at least the loading/unloading of the workpiece and the replacement of the grinding wheel.

Abstract: Bismuth dithiocarbamate (BiDTC) is added to a urea grease containing a lubricating base oil having a poly-?-olefin synthetic oil or a diphenyl ether synthetic oil and a diurea thickening agent, or a fluorine grease containing a lubricating base oil having fluorinated synthetic oil and a polytetrafluoroethylene thickening agent. By taking such constitution as described above, a surface film is formed on a surface of a raceway of any one of inner and outer rings or a surface of a rolling element of a bearing. Therefore, the rolling bearing in which a grease composition having the constitution is packed can maintain an excellent lubricity for a long period of time even under severe conditions such as a high rotation, a high temperature and a heavy load. Further, the grease composition for the rolling bearing is low in harmfulness to a human body and gives little load to the environment.

Abstract: An electric power steering apparatus includes a speed reducing mechanism for decelerating the rotation of a rotatable shaft in an electric motor and a converting mechanism for converting the output rotation of the speed reducing mechanism into the axial movement of a steering shaft extending toward the right and left sides of a vehicle. The speed reducing mechanism includes an input pulley driven by the electric motor, an output pulley arranged with the steering shaft enclosed thereby, a belt for connecting the input pulley and the output pulley to each other, and a belt tension adjuster.

Abstract: A control device is provided for electrically controlling a drive power transmission device arranged on a driving power transmission path of a front-and rear wheel drive vehicle thereby to switch the drive mode of the vehicle selectively to either of a two-wheel drive mode and a four-wheel drive mode. The control device inhibits the drive mode from being switched to that commanded to be switched to when the vehicle is traveling at a slower speed than a predetermined speed and when the rotational speed difference between front and rear wheels is larger than a predetermined value. Further, the control device gradually decreases a present torque which the driving power transmission device is transmitting before the switching of the drive mode, to a target torque which the drive power transmission device is to transmit after the switching of the drive mode, when the difference between the present and target torques is more than another predetermined valve at the time of the switching of the drive mode.

Abstract: A rolling bearing apparatus includes inner rings, an outer ring, and sealing devices each having a seal case fixed to the outer ring. The seal case includes a fixing portion press-fitted in the outer ring, and a ring-shaped portion extending radially inwardly from an axially-outer end of the fixing portion. The fixing portion has a ridge formed on and projecting radially outwardly from an outer peripheral surface thereof. The ridge is disposed nearer to the axially-outer end of the fixing portion than an axially inner end of the fixing portion.

Abstract: A vehicle bearing assembly includes a sensor mounting hole provided in a cover of an outer ring member; a rotational speed sensor that is inserted in the sensor mounting hole; and an O-ring disposed between an inner peripheral surface of the sensor mounting hole and an outer peripheral surface of the rotational speed sensor. A chamfered portion is formed along the edge of the opening of the sensor mounting hole on the outer face of the cover. A chamfer edge portion as the boundary between the inner peripheral surface of the sensor mounting hole and the chamfered portion has a depth in the axial direction.

Abstract: In an evaluation apparatus of a hub unit, a signal processing unit outputs frequency analysis signals which indicate such a result obtained by that an output signal of an acceleration sensor fixed on a hub unit by a magnet is processed via an A/D converting unit and an envelope detecting unit, and thereafter, the processed sensor signal is analyzed for a frequency analysis by an FFT unit. Then, an evaluation output unit evaluates damage conditions of the hub unit based upon signal strengths of specific frequencies, and overall values, which are acquired from the frequency analysis signals, and then, outputs the evaluated damage condition to a display unit.

Abstract: A grinding wheel formed on an outer peripheral surface with a grinding surface is attached to a grinding wheel spindle supported by axial active magnetic bearings and radial active magnetic bearings in a noncontact manner axially and radially and rotated by an electric motor. A casing is axially positioned and then is radially moved and a ground part of a workpiece is ground. Before the casing moves radially and the grinding wheel comes in contact with the workpiece, the stiffness value of the radial magnetic bearings is set to an initialization value lower than a value at the usual grinding time and after the grinding surface of the grinding wheel comes in contact with the workpiece, the stiffness value of the radial magnetic bearings is set to a value higher than the initialization value for grinding the workpiece.

Abstract: A motor 10 includes a cylindrical housing 2 having an inner circumferential surface 2a, and a stator core 13 accommodated in the housing 2. The stator core 13 includes a plurality of separate cores 30, which are annularly arranged along the inner circumferential surface 2a of the housing 2. Each separate core 30 includes a core back 31, which forms a part of the cylinder of the stator core 13, and a tooth 15, which project radially inward from the core back 31. The core back 31 is formed such that vertices A1, A2 of the corners of an arcuate portion 32 in the radially outer side are inside a range between rays L1, L2 that extend from a center point O of the stator core toward vertices B1, B2 of the corners of a straight portion 33 of the core back 31 in the radially inner side.

Abstract: A shaft body has an engagement portion with a slip-off preventing groove, and a positioning recess extending from the engagement portion. A shaft joint having an engagement groove to be engaged with the engagement portion and a bore facing the engagement groove is provided with a flexible member which is provided on an outer side in a longitudinal direction of the engagement groove to be engaged with the positioning recess. When an insufficient amount of engagement prevents engagement in the correct position, the engagement portion contacts with the flexible member and prevents the shaft body from engaging with the shaft joint. When canceling the coupling for maintenance, etc., the engagement of the flexible member with the positioning recess is cancelled by deflecting the flexible member in a width direction of the engagement groove. Consequently, the shaft body can be easily pulled out in a longitudinal direction of the engagement groove.

Abstract: A brushless motor includes a stator and a rotor. The stator includes an annular stator core having teeth arranged with a spacing in a circumferential direction of the annular stator core; and coils wound around the teeth respectively. The rotor includes a rotor core and magnetic poles of segment magnets arranged annularly along a circumferential direction of the rotor core. The segment magnets are stacked at a plurality of stages in an axial direction of the rotor core. A length direction of each of the segment magnets is parallel with the axial direction of the rotor core. The following expression is satisfied: (2×?/P)+?<(360/P) where P is the number of the magnetic poles of the segment magnets at each stage, ? (electrical angle) is the effective pole angular aperture on the outer peripheral surface of the rotor core, and ? is the skew angle equivalent to a phase shift angle between the corresponding magnetic poles of the segment magnets at the adjacent stages.

Abstract: To control initial shudder in a wet paper friction plate, the frictional sliding surface of a wet paper friction member is preconditioned by frictional sliding contact with a mating plate until its bearing length ratio tp at a cutting depth of 10 ?m is in the range from 70 to 85%. The preconditioning is optionally preceded by grinding, preferably before the wet paper friction member is attached to a base plate.

Abstract: A manufacturing method for a brush that can reduce contact surface area between a commutator and the brush, thereby reducing frictional noise, is provided. Specifically, a method to manufacture a brush, which provides one surface with contact surfaces that make sliding contact with the commutator, involves a step to mold a molded body and a step to cut the molded body. In the molding process, carbon powder containing copper powder is sintered to form a molded body having a groove on the top surface along the direction of the axis of rotation of the commutator, and curved surface margins in the margins of the top surface in the direction of the axis of rotation. In the cutting step, the central part of the top surface of the molded body is cut by a grinding stone along the cutting direction to form contact surfaces between the margins of the top surface.

Abstract: A sensorless controlling apparatus for controlling a brushless motor includes a speed calculator for calculating speed of a rotor ?, an angle calculator for calculating rotor angle ? at a predetermined time interval, and an angle controller for calculating correction angle ?? based on the current value of a d-axis current (d-axis current value id), thereby controlling the rotor angle ?. The angle calculator uses the correction angle ?? calculated by the angle controller, the speed ? calculated by the speed calculator, a predetermined time, and the rotor angle ? calculated by the angle calculator at a predetermined time to calculate the rotor angle at the predetermined time interval. Thus, the rotor angle ? calculated by the angle calculator is converged on the true angle of the rotor.

Abstract: An axle bearing assembly includes a flange, on which a wheel is mounted; a hub shaft constructed of a cylindrical portion provided on an inboard side of the flange; a bearing having an inner ring; an outer ring; and rolling elements disposed between the inner ring and the outer ring; a first sealing member fixed to an inboard side between the inner ring and the outer ring; and a removable second sealing member is fitted to the inboard side of the first sealing member. The inner ring of the bearing portion is fixed to the cylindrical portion of the hub shaft.

Abstract: A variable transmission ratio apparatus for effectively preventing ratcheting between a flexible spline and a circular spline caused by a steering operation performing in a locked state. A variable transmission ratio apparatus includes a strain wave gear mechanism for adding rotation resulting from motor drive to rotation from an input shaft resulting from a steering operation and transmitting the added rotation to an output shaft, a housing accommodating the strain wave gear mechanism and the motor and fixed to a non-rotating portion, and a lock device for locking the housing and a motor shaft in a manner prohibiting relative rotation therebetween. Among the circular splines forming the strain wave gear mechanism, the number of teeth of the circular spline connected to the output shaft is greater than the number of teeth of the circular spline connected to the input shaft.

Abstract: A tapered roller bearing according to the invention is such that the surface hardnesses of a raceway surface of an inner ring and rolling contact surfaces of tapered rollers are set to 63 to 69HRC. In addition, respective raceway surfaces of an outer ring and the inner ring and the rolling contact surfaces of the tapered rollers are crowned and are set such that a total crowning amount is 50 ?m or larger, an outer crowning rate is 40% or larger and a roller crowning rate is 20% or smalled.