Abstract: It is an object of the present invention to provide an electric power steering apparatus to be small and compact. The control housing 30 is installed between the motor housing 25 of the electric motor 18 and the gear housing 22. The ECU controlling the electric motor 18 is accommodated in the accommodating room S formed within the control housing 30. The motor housing 25 accommodates the bus bar 45 connected to the coil 44 of the stator 36, and the resolver 40 detecting the rotational position of the rotor 35. The rosolver 40 is installed within the bus bar mounting member 262 in inner side of radial direction. The partition 52 is mounted on the control housing 30 and the fixing screw 81 is engaged with the insulating member 84 by the way that the fixing screw 81 is inserted into insulating member 84 from its bottom surface side.

Abstract: A steering shaft is composed of an upper shaft, a lower shaft, an input shaft, and an output shaft. The upper shaft, the lower shaft, and the input shaft can rotate together, and the input shaft and the output shaft are relatively rotatably coupled to each other via a torsion bar. The rotational position of a rotor coupled to the output shaft is calculated based on the detected rotational position of the lower shaft and a steering torque detected based on the amount of relative rotational displacement of the input shaft and the output shaft. Thus, it is not necessary to include a rotor rotational position detecting unit for detecting the rotational position of the rotor within the electric motor, which reduces the size of the electric motor.

Abstract: A microcomputer is provided with an extracting section capable of extracting a specific frequency component from an input signal. The extracting section extracts, from a pinion angle corresponding to a signal indicating the state of a steering system, a frequency component corresponding to a vibration that increases generation of a rattling noise in a speed reducing mechanism. The extracting section outputs an effective value of the extracted frequency component as a power spectrum. If the power spectrum output from the extracting section is equal to or more than a predetermined threshold value, the microcomputer outputs a motor control signal to reduce the assist force generated by the EPS actuator.

Abstract: The invention provides an electric power steering system which is adapted to enhance the versatility of a detector coil including lead pins and which may be manufactured at low costs. The electric power steering system PS of the invention has an arrangement wherein lead pins 11 of a detector coil 6 and a control board 30 constituting a control unit 10 are interconnected via a wire harness 13. The lead pin 11 and the wire harness 13 are interconnected via a conductive sleeve terminal 14. The sleeve terminal 14 includes: a cylindrical sleeve portion 40 fitted about the lead pin 11; and a connection portion 41 connected with the wire harness 13 and upstanding from an outside periphery of the sleeve portion 40.

Abstract: In an energy absorbing steering system including a steering shaft to which a steering member is coupled, and a steering column that rotatably supports the steering shaft, at least one of the steering shaft and the steering column includes an impact absorbing portion that contracts when a load equal to or higher than a predetermined value is applied, and the impact absorbing portion includes a first impact absorbing portion having a first impact absorption load, and a second impact absorbing portion having a second impact absorption load different from the first impact absorption load.

Abstract: A first spacer, a second tubular member, and a second spacer are externally fitted and fixed to an outer peripheral surface of a nut. The second tubular member is formed by stacking a plurality of silicon steel plates without any gap, and is arranged between the first spacer and the second spacer axially. The outer diameter of an outer peripheral surface of the second tubular member is made larger than the outer diameter of an outer peripheral surface of the first spacer and the outer diameter of an outer peripheral surface of the second spacer. A detection surface of a first displacement detector is made to radially face a contact portion between the second spacer and the second tubular member, while a detection surface of a second displacement detector is made to radially face a contact portion between the first spacer and the second tubular member.

Abstract: A rolling bearing device with a sensor includes a rotational component estimator that extracts a rotational synchronization component included in the rotation of an inner shaft relative to an outer ring from each of a signal output by a first displacement detector and a signal output by a second displacement detector. The rotational component estimator performs rotational operation and integration operation.

Abstract: A bearing device for an axle includes a hub shaft including a flange formed at an outer side portion, and a cylindrical portion formed on an inner side and having a through hole, and a bearing portion including an inner ring, an outer ring, and rolling elements. The bearing portion is press-fitted on the cylindrical portion, and a shaft end portion of the hub shaft is caulked to apply an axial force to the bearing portion. A spacer is interposed between the bearing portion and a caulked portion, and the spacer has a fitting hole fitted on the cylindrical portion, and includes a projecting portion formed at an inner side of an outer periphery, and an inner side end surface of the projecting portion of the spacer is located inwardly of an inner side end surface of the caulked portion in the axial direction.

Abstract: A rolling, sliding part is made from a bearing steel, and the rolling, sliding surface thereof has a surface layer portion which is 56 to 64 in Rockwell C hardness, up to 12 vol. % in retained austenite content and 4 to 6 degrees in the X-ray half value width of martensite. Even if made from a common bearing steel, the rolling, sliding part is reduced in the likelihood of developing a WEA or like fatigue structure, consequently exhibiting a prolonged rolling, sliding life for use under severe conditions involving a high temperature, high speed, high load or high vibration.

Abstract: The control system of a vehicle controls the transmission ratio of the steering angle of a steering wheel relative to a turning angle of front wheels based on a drive force distribution ratio. Thus, the performance of the tires on the front wheels can be used to almost maximum potential, providing effective prevention of understeering.

Abstract: A method of manufacturing of power transmission chain 1 by interconnecting plural link plates 2 with pins 3. Individual pin pairs 3 are arranged and temporarily fixed to places. The link plates 2 are sequentially stacked in layers by press-fitting respective through-holes 4 of the link plates 2 about the respective pin pairs 3, whereby the link plates 2 are interconnected to form a circular chain (an endless loop). Subsequently, the individual pin pairs 3 are released from the temporarily fixed state. Thus, the manufacture of the power transmission chain 1 is decreased in the number of operation steps, so that the chain may be assembled easily.

Abstract: The present invention provides a rack-and-pinion steering apparatus capable of effectively reducing reverse input, while a high degree of design freedom is secured. The sum of the tilt angle of a rack tooth with respect to a reference line perpendicular to the axial line of a rack shaft and the tilt angle of a pinion tooth with respect to the axial line of a pinion shaft does not coincide with the tilt angle of the axial line of the pinion shaft with respect to the reference line. Crowning is given on the tooth surface of the rack tooth (or the pinion tooth) in order to decrease the tooth width on one end side in the direction of tooth trace and to increase the tooth width on the other end side according to the state of contact with the pinion tooth (or the rack tooth) opposed thereto.

Abstract: A configuration is provided in which detected torque values detected by a main torque sensor and a sub-torque sensor in such a state that a predetermined torque including zero is applied are captured, a calculation of a torque difference is repeated a plurality of number of times, an average value of an absolute value of a torque difference which is calculated each time is obtained, this average value is written to be stored in an EEPROM, and a threshold value used for the failure determination is corrected based on the stored value.

Abstract: A microcomputer is provided with an extracting section capable of extracting a specific frequency component from an input signal. The extracting section extracts, from a pinion angle corresponding to a signal indicating a state of the steering system, a frequency component corresponding to a vibration of a steering system caused by stress applied to steerable wheels. The extracting section outputs an effective value of the extracted frequency component as a power spectrum to a second computing section. In the case that the power spectrum output from the extracting section is equal to or more than a predetermined threshold value, the microcomputer enhances a torque inertia compensation control so as to suppress vibration of the steering system caused by the stress. In other words, the microcomputer increases a torque inertia compensation amount corresponding to a compensation component based on a steering torque differential value.

Abstract: A wheel bearing apparatus includes a roller bearing, an inner shaft having an outer circumferential surface to which an inner ring of the roller bearing is installed, a coupler ring attached to an end portion of the inner shaft, and a caulked portion provided in an end portion of the inner shaft so as to fix the coupler ring and the roller bearing to the inner shaft so as to be immovable in an axial direction of the inner shaft. An outer diameter of the coupler ring is set smaller than a diameter of a shoulder portion of the inner ring. Alternatively, a protruding portion is provided in any one of opposing end surfaces of the coupler ring and the inner ring, whereby the coupler ring is arranged away from a seal member. Accordingly, it is possible to avoid an interference of the coupler ring with the seal member.

Abstract: A plurality of microscopic grooves are created on the surface of the teeth of planetary gears, and thus, irregular unevenness is created. This irregular unevenness includes a plurality of first microscopic grooves which function as lubricant grooves and a plurality of second microscopic grooves which are shallower than the first microscopic grooves.

Abstract: A tool moving device with a linear motor is provided with a movable body which is movable bodily with a tool on a support frame through a pair of fluid bearings. A plurality of magnet constructs are circumferentially arranged on the movable body to respectively face stationary coils secured to the support frame. Each of the magnet constructs comprises at least one pair of magnet members juxtaposed in the moving direction of the magnet yoke and arranged with their polarities of magnet pole being opposite to each other, wherein respective pairs of the magnet members attached to the circumferential surface form first and second rows spaced from each other in the moving direction of the magnet yoke. Each magnet member in each of the first and second rows is arranged to be opposite in polarity of magnet pole to each of the magnet members next thereto in the circumferential direction.

Abstract: A boot for constant-velocity universal joint is retained to a shaft, which has a general surface, a tapered surface, or a vertical surface instead of the tapered surface, and a major-diameter surface that are disposed one after another in this order and coaxially. The boot includes a minor-diameter cylindrical portion, a major-diameter cylindrical portion, a tapered wall portion, or a vertical wall portion instead of the tapered wall portion, and a bellows. The minor-diameter cylindrical portion is retained to the major-diameter surface of the shaft. The major-diameter cylindrical portion is disposed separately away from the minor-diameter cylindrical portion and coaxially therewith. The tapered wall portion is in contact with the tapered surface of the shaft. The vertical wall portion is in contact with the vertical surface of the shaft. The bellows connects the tapered wall portion or the vertical wall portion with the major-diameter cylindrical portion integrally.

Abstract: A boot for constant-velocity universal joint includes a minor-diameter cylindrical portion, a major-diameter cylindrical portion, and a bellows. The bellows connects the minor-diameter cylindrical portion with the major-diameter cylindrical portion integrally, and includes a plurality of crests and roots, being made of a first crest, a first root, a second crest, a second root, and so on, which are disposed alternately in this order from one of the opposite ends that faces the minor-diameter cylindrical portion to the other one of the opposite ends that faces the major-diameter cylindrical portion. The bellows further includes a rising wall, which connects one of the opposite ends of the minor-diameter cylindrical portion that faces the bellows with a top of the first crest in the bellows, and which exhibits a rising angle of less than 45 degrees to an imaginary central line of the boot or that of the shaft.

Abstract: A control device includes a differential amplifying circuit for obtaining a difference between values of exciting currents (exciting voltage values) supplied to a pair of axial electromagnets and a pair of radial electromagnets, multiplying the obtained difference by coefficient times, and outputting it as the bearing load in an axial direction and a radial direction. The exciting current includes steady current supplied to the axial electromagnets and the radial electromagnets and control current which varies by the displacement of a main shaft. By supplying the steady current to the axial electromagnets and the radial electromagnets, the magnetic attraction force of the axial electromagnets and the radial electromagnets having non-linearity is linearly approximated. Accordingly, the difference between the values of the exciting currents (exciting voltages) supplied to a pair of electromagnets is obtained and is multiplied by coefficient times, thereby obtaining a value corresponding to the bearing load.