Abstract: The controller in an electric power steering apparatus stores the relationship between the steering torque and the basic assist torque in which the relationship is stored as assist characteristic, and stores the relationship between the steering angle correspondence value corresponding to the steering angle of the vehicle and the motor output correction value in which the relationship is stored as correction characteristic. The controller corrects the output of the motor, which is required in order to generate the basic assist torque, in accordance with the motor output correction value determined from the steering angle correspondence value and correction characteristic, in which the basic assist torque is determined from the steering torque and assist characteristic.

Abstract: A one-way clutch includes an inner ring, an outer ring disposed coaxially with the inner ring, a plurality of rollers interposed between the inner and outer rings, a cage holding the rollers to locate these rollers in a circumferential direction of the inner and outer rings. When the rollers are brought into biting engagement with an outer peripheral surface of the inner ring and an inner peripheral surface of the outer ring, the inner and outer rings rotate in unison, and when the rollers are disposed out of biting engagement with the inner and outer rings, the inner and outer rings rotate relative to each other. Grooves are formed in the outer peripheral surface of the inner ring, and each of the grooves serves to increase a contact pressure of the corresponding roller relative to the inner ring at part of a region of contact between the roller and the inner ring.

Abstract: It is an object of the present invention to provide a resin gear for an electric power steering apparatus excellent in mechanical strength and durability, in which damage of teeth, for example, does not occur even when the gear is employed in an electric power steering apparatus equipped with a high-power electric actuator. In a resin gear for an electric power steering apparatus in the form of a worm wheel 10, a gear portion 16 thereof is formed of a resin molding material containing a thermosetting resin and polyparaphenylene-benzobisoxazole fibers (PBO fibers) as essential constituents.

Abstract: The super finishing stone has such a shape that a width of an abrasive surface in a direction perpendicular to a radial direction becomes gradually narrower from outside to inside in the radial direction, when the raceway surface and the abrasive surface in contact with the raceway surface are seen at a plurality of sections perpendicular to the radial direction of the object to be worked, so that the abrasive surface and the raceway surface in contact with the raceway surface may intersect with each other at a constant angle at opposite side edges of the abrasive surface.

Abstract: When it is determined that the torque output from the electric motor abnormally fluctuates or the torque output from the electric motor varies between clockwise and counterclockwise turning operations of the driver's steering wheel, the steering assist control is continued if the vehicle speed v is equal to or lower than the reference speed v0. In this case, the width of the dead band of the steering torque in the assist map used to calculate the target assist torque is increased. Thus, only in a case where the vehicle is moving at a low speed and the driver's steering wheel is operated with a great force, the steering assist torque is produced to alleviate the burden on the driver. In the other cases, the electric motor is stopped to minimize a sense of discomfort in the steering operation.

Abstract: In a power transmitting device, projections are formed on a surface of a main cam that faces an armature. This structure causes the main cam to contact the armature only at distal surfaces of the projections. The area of the distal surfaces of the projections is in a range where the magnetic flux density generated at the distal surfaces of the projections by the electromagnet is saturated. Therefore, reduction of the responsiveness and controllability of the power transmitting device due to magnetization of the main cam is suppressed.

Abstract: A power transmission chain includes a plurality of links aligned in a chain travel direction and a plurality of coupling members that couple the plurality of links one to another. The coupling member includes a first power transmission member and a second power transmission member. The first power transmission member in the coupling member includes an opposing portion that opposes the corresponding second power transmission member. The opposing portion comes into contact with the corresponding second power transmission member on a contact portion that undergoes displacement in association with a change of a bending angle between corresponding links in a contact state including at least one of rolling contact and sliding contact.

Abstract: A pressure sensor is composed of a pressure housing having a pressure chamber inside and a pressure sensitive element arranged in the pressure chamber, and a joint housing having a fluid passage for leading fluid into the pressure housing, wherein the pressure housing and the joint housing are jointed by brazing with an insulating member interposed at a joint section therebetween. A stress relieving member is interposed at least either between the metal housing and the insulating member or between the joint housing and the insulating member, so that the insulating member can be relieved of a stress which is caused by the braze jointing to act on the insulating member.

Abstract: A motor includes a rotor having a permanent magnet fitted thereon, and a stator having an inner peripheral surface spaced a predetermined distance from an outer peripheral surface of the rotor in opposed relation thereto, and the stator is press-fitted in a motor case to be fixed thereto with its outer peripheral surface. A plurality of projecting portions are formed on an inner peripheral surface of the motor case. Recess portions for engagement with the respective projecting portions are formed in the outer peripheral surface of the stator. When the stator is press-fitted into the motor case, the stator is fixed to the motor case with inner bottom surfaces of the recess portions serving as press-fitting surfaces. The projecting portions of the motor case are engaged respectively in the recess portions of the stator, thereby preventing the rotation of the stator relative to the motor case.

Abstract: The invention provides an electric power steering apparatus which can improve a steering feeling. In the electric power steering apparatus, in the case that once the electric abnormality is generated in the hardware such as the motor, the torque sensor or the like and an output of the assist force by the motor is reduced, however, the electric abnormality is thereafter dissolved due to some kind or another reason, the output of the assist force by the motor is increased immediately to an intermediate target value (within a broken line ?). Accordingly, it is possible to prevent such a steering feeling as the steering wheel becomes suddenly heavy.

Abstract: The controller for a brushless motor controls motor current by executing updates of applied voltage to a coil in accordance with rotational position of a rotor, the target current, and the actual current flowing through the coil. The updates of applied voltage to the coil are executed according to the results of calculations of applied voltage to the coil in accordance with the rotational position of the rotor, the target current, and the actual current flowing through the coil, in order to generate power for rotating the rotor by varying magnetic field generated by the coil. The cycle time of the updates of applied voltage is shorter than the cycle time of the calculations of applied voltage corresponding to the rotational position of the rotor.

Abstract: A stator of an electric motor includes a stator core including an annular yoke. The stator core includes a plurality of teeth formed on, for example, an inner periphery of the yoke and has a coil wound on each of the teeth. Each of the teeth includes first and second end portions opposed to each other in a radial direction of the stator core. The first end portion is connected to the yoke. The second end portion is formed with an axially extending projection extending in an axial direction of the stator core. A coil receiving groove is defined between the axially extending projection and the yoke. The axially extending projection includes a distal end portion in the axial direction, and a root portion adjoining a bottom of the coil receiving groove. In the radial direction, a thickness of the root portion is greater than a thickness of the distal end portion.

Abstract: A ball screw mechanism including a screw shaft with a screw groove formed on an external surface, a nut with a screw groove formed on an internal surface, and plural balls held in the grooves. A ball circulation piece is fit in a window portion in the nut and has a circulation groove for circulating the balls. The screw groove of the nut and the circulation groove are machined by moving a tool of a diameter equal to or larger than the diameter of the balls, along the screw groove of the nut so that a step is eliminated at a joint therebetween. The infeed depth of the tool is gradually changed as the tool is moved toward the joint so that boundary lines between a machined surface and a non-machined surface on flanks of the screw groove of the nut extend at an acute angle to one another.

Abstract: A differential gear 1 for a vehicle comprises a differential case 2 having a pair of holes 9R, 9L for drive shafts, a pair of pinion gears 3, 4 supported by pinion gear supporters 10, 11 and a pair of side gears 5R, 5L engaging with the pinion gears 3, 4. A pair of thrust washers 6R, 6L is interposed between the backs of the side gears 5R, 5L and the inner peripheries of the holes 9R, 9L without radial movement.

Abstract: The invention provides a rolling-sliding part which can attain more prolonged service lives even when used in rolling bearings which are exposed to contaminated lubricating oil. Rolling-sliding parts are made of steel which contains C: 0.7 to 0.9 wt. %, Si: 0.05 to 0.7 wt. %, Mn: 0.05 to 0.7 wt. %, Cr: 3.2 to 5.0 wt. %, Al: 0.04 wt. % or less, P: 0.03 wt. % or less, S: 0.03 wt. % or less, Ti: 0.005 wt. % or less, O: 0.0015 wt. % or less, at least one of Mo: less than 1.0 wt. % and V: less than 0.50 wt. %, and Fe and unavoidable impurities: balance, and which has a carburized layer in the surface. The precipitated carbide content of the layer is adjusted to 9 to 30% in terms of area ratio. At least 50% of the precipitated carbides present in the layer are of M7C3-type and/or M23C6-type in terms of area ratio. The average particle size of the carbides present in the layer is adjusted to 0.2 to 0.4 ?m and the residual austenite content of the layer is adjusted to 35 to 60%.

Abstract: A tangential grinding resistance measuring method comprises a section area obtaining step of obtaining an abrasive grain section area which is at a predetermined infeed depth from the highest top surface of abrasive grains on a grinding wheel; a tangent calculation step of calculating the tangent of a half vertex angle of a conical model for cutting edges of the abrasive grains which model takes the abrasive grain section area as its bottom surface and the predetermined depth as its height; a parameter setting step of setting grinding parameters; a tangential grinding resistance calculation step of calculating a tangential grinding resistance from the grinding parameters and the tangent.

Abstract: There is provided a vehicle steering system which includes an electric motor for imparting a steering force to a steering mechanism of a vehicle and an automatic parking controller for executing an automatic parking control by controlling the electric motor, wherein the automatic parking controller controls an energizing voltage of the electric motor by imparting a square wave to the electric motor and increasing/decreasing a neutral point voltage of a winding of the electric motor.

Abstract: An in-vehicle controller of the invention is a so-called drive recorder. The drive recorder is incorporated in a steering ECU (controller) 10. For this purpose, the controller 10 is provided with function implementation units which includes a memory 22 as a data logging section, a memory controlling section 23, a threshold judging section 24 and a data-transfer timing output section 25. Vehicle information and steering information are stored in a first memory 221 in chronological order. A second memory 222 logs data recorded in a tens-second period before and after a moment when vehicle acceleration exceeds a predetermined threshold. The information logged by the second memory 222 is transferred to a hard disk of a navigation unit 30 in a predetermined timing.

Abstract: The end faces of a first pin contain bulging curved faces having an egg-like shape, when viewed along a chain width direction. Each bulging curved face includes a first end portion, a second end portion and a maximum width portion with respect to a chain advancing direction. With respect to perpendicular directions, the distance between the center of the maximum width portion and the first end portion is relatively large, whereas the distance between the center of the maximum width portion and the second end portion is relatively short. It is possible to enlarge the surface area of the bulging curved face.

Abstract: It is an object of the present invention to provide a differential case for a vehicle and a differential device for a vehicle supplying sufficiently lubrication oil to a gear peripheral portion as a supported portion of a pinion gear in order to prevent a bonding of the gear peripheral portion of the pinion gear. The differential case or the differential device for the vehicle comprises a pair of pinion gear supporting portions 10, 11 supporting slidably a pair of pinion gears 3, 4, and a lubrication oil introducing portion 7, 8 provided around a peripheral portion of the pair of pinion gears 3, 4 to introduce lubrication oil into a clearance between sliding faces of the pair of pinion gears 3, 4 and pinion gear supporting faces 10a, 11a, 10b, 11b of the pair of pinion gear supporting portions 10, 11.