Abstract: It is an object of the present invention to provide a machine tool and a machining method thereof which can execute to machine the workpiece more precisely. The machine tool comprises a tool supporting member 21 relatively movable to a workpiece W along a predetermined axis and supporting a tool 40, a servo motor 32 driving the tool supporting member 21 to the workpiece W along the predetermined axis, a sizing sensor 50 measuring a profile of the workpiece W machined by the tool 40 and outputting a size deviation of measured values from a target profile, and a servo driver 33 driving the servo motor 32 in a feedback control based on the size deviation being output from the sizing sensor 50.

Abstract: A rotational angle sensor used in an electric power steering apparatus detects a rotational angle of a motor shaft at a portion on a steering system side, as a motor rotational angle (?m). A MPU sets a base correction amount (???m) based on a q-axis actual current value (Iq). The MPU sets a rotational angle correction amount (??m) used to correct the motor rotational angle (?m) by decreasing the base correction amount (???m) as a rotational angular speed (?) increases and by increasing the base correction amount (???m) as a torque differential value (dT/dt) increases.

Abstract: [Problems] A bearing assembly is provided which is designed to prevent a core (metal annular member), used in a synthetic-resin cover, from disengaging from the cover. [Means for Solving Problems] A bearing assembly H includes: a synthetic-resin cover 25 fitted in an inside surface of a vehicular-inner-side end of an outer ring member 2, and a metal annular member 33 disposed on an inside surface of a fitting engagement portion 26 of the cover 25, the fitting engagement portion being fitted in the inside surface of the outer ring member 2. The annular member 33 includes an engaging portion 33a in engagement with the cover 25.

Abstract: In an assembling method for roller bearing assembly according to the invention, a cage 25 featuring high general-purpose versatility is used whereas a retainer ring 40 for preventing the drop-off of first-row tapered rollers 18a is fitted in a sub-assemble member 20 at place diametrically inwardly with respect to the first-row tapered rollers 18a. Subsequently, a hub body 16 is combined with an outer ring 13 having the first seal ring 15 and the sub-assemble member 20 mounted thereto, as pushing out the retainer ring 40 by means of a step portion defined between a smaller-diameter cylindrical surface portion 30 and a first inner raceway 28 of the hub body 16.

Abstract: Manufacture method and manufacturing apparatus for power transmission chain according to the invention are adapted to accomplish exact positioning of pin members and link plates. This permits the pin members to be positively press-inserted into pin holes of the link plates and hence, the fabrication of the power transmission chain is facilitated.

Abstract: A first gear set includes an input member that serves as a first gear and an inner ring that serves as a second gear. A first end of the inner ring is inclined with respect to the input member and is in mesh with the input member. The input member has a plurality of retention grooves that are formed in an input member body and a plurality of pins that are retained in the respective retention grooves and that respectively constitute teeth of the input member. The first end has a plurality of tooth grooves that are engageable with the pins. A resultant force of forces applied to each pin from the retention groove and the tooth groove urges the pin toward the retention groove.

Abstract: A spindle device is provided with a temperature sensor for detecting the temperature of an antifriction bearing or the temperature of a part of either one of a housing and a spindle which part is influenced by a temperature change of the antifriction bearing, and an abnormality detection section for detecting the abnormality of the antifriction bearing based on the change speed of the temperature of the antifriction bearing detected by the temperature sensor, so that the abnormality of the antifriction bearing can be detected more precisely.

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: An expandable shaft includes an outer shaft and an inner shaft. Plural rolling elements are pinched elastically in a space between raceway grooves of the outer shaft and the inner shaft. An outer peripheral surface of the inner shaft includes flat portions parallel to each other. An inner peripheral surface of the outer shaft includes flat limiting portions parallel to each other. The respective limiting portions limit relative rotation of the outer shaft and the inner shaft by engaging with corresponding flat portions. A deformation promoting portion is placed in a specific region of the outer shaft between a plane including a center of curvature of the raceway groove of the outer shaft as well as a central axis line of the outer shaft and each limiting portion.

Abstract: An upper lid and a bottom lid are fastened to flange portions formed in outer side surfaces of a casing main body. A metal collar to which a screw serving as pressing means (a fastening member) is inserted is embedded in each flange portion. Both end portions of each of the metal collars protrude at a predetermined length toward the upper lid and the bottom lid from the flange portion. A predetermined interval corresponding to the length of the protruding portion of the metal collar is created between the casing main body and the upper lid and between the casing main body and the bottom lid, by bringing the upper lid and the bottom lid into contact with the protruding portions of each of the metal collars at a time of assembling.

Abstract: To provide a bearing structure in which the processing is easy, and the manufacturing cost can be reduced.

Abstract: A vehicle differential gear device has: a differential case having a plurality of pinion gear insertion holes and a side gear passage hole; a plurality of shaftless type pinion gears that are rotatably supported in the plurality of pinion gear insertion holes formed in the differential case; and a pair of side gears that are rotatably supported in the differential case, engage with the plurality of shaftless type pinion gears, and has an outer diameter greater than that of the plurality of shaftless type pinion gears, the side gear passage hole allowing passage of the pair of side gears.

Abstract: An electric power steering device (1) is provided which transmits output rotation of an electric motor for generating a steering assist force (16) to a steering mechanism (64) via a driving gear (22) and a driven gear (21). A housing (8) has a support hole (28) for supporting one end portion (23) of a shaft (20) co-rotatable with the driving gear (22) via a bearing (26) in such a manner as to permit the one end portion (23) to be offset toward the driven gear (21) radially of the driving gear (22). A biasing member (33) which biases the driving gear (22) toward the driven gear (21) includes an arcuate main portion (47) fitted around an outer peripheral surface (58) of an outer ring (36) of the bearing (26) and opposed to an inner peripheral surface (42) of the support hole (28). A pair of movement restriction portions (50, 51) which restrict circumferential movement of the main portion (47) are respectively provided at a pair of arc ends (48, 49) of the main portion (47).

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 roller bearing includes: an outer ring that has outer ring raceway; an inner ring that has inner ring raceway surfaces that face the outer ring raceway surfaces; a plurality of cylindrical rollers that are arranged between the outer ring raceway surfaces and the inner ring raceway surfaces. The outer ring has an outer ring rib that is in point-contact with one axial end surface of each of the cylindrical rollers and that is arranged adjacent to the outer ring raceway surfaces. Contact positions at which the cylindrical rollers contact the outer ring rib are set to be on an axis of the cylindrical roller and an axis of the cylindrical roller.

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: A motor-driven steering controller for controlling a steering wheel of a vehicle. The controller includes a steering torque controlling unit, a braking force estimating unit, a right and left braking force difference estimating unit and an assist steering torque providing unit. The steering torque controlling unit controls a steering torque on the steering wheel depending on a steering operation. The braking force estimating unit estimates braking forces to be imposed on wheels of the vehicle. The right and left braking force difference estimating unit estimates difference between the braking forces to be imposed on the right and left wheels each estimated by the braking forces estimating unit. The assist steering torque providing unit provides an assist steering torque for the steering torque controlling unit on the basis of the difference in braking force between right and left wheels estimated by the right and left braking force difference estimating unit.

Abstract: Both an end surface of a first rib, over which a first cylindrical rollers slide, and an end surface of a second rib, over which the first cylindrical rollers slide, slope to approach the perpendicular bisector plane of a first cylindrical raceway surface of an outer ring or slope to be spaced away from the perpendicular bisector plane as it goes outward in a radial direction in a cross section of the outer ring taken in an axial direction. A first sliding contact portion of each first cylindrical roller, which is in sliding contact with the end surface of the first rib, and a second sliding contact portion of each first cylindrical roller, which is in sliding contact with the end surface of the second rib, both are located inward in the radial direction with respect to an orbital cylindrical plane of the first cylindrical rollers.

Abstract: An intermediate member is rockably provided around an outer periphery of a corresponding one of tripod shaft portions. Shaft-like rolling elements are retained by corresponding retainers so that the shaft-like rolling elements are able to circulate around the corresponding intermediate members and are able to roll between side surfaces of a corresponding one of raceway grooves of an outer ring and a torque transmitting surface of a corresponding one of the intermediate members. Then, raceway recesses are formed on the side surfaces of each raceway groove so as to extend in a direction of a rotation axis of the outer ring. The shaft-like rolling elements are fitted in the corresponding raceway recesses and are able to roll along bottom surfaces of the respective raceway recesses. Thus, the retainers are arranged outside the raceway recesses.

Abstract: A steel for use in high strength pinion shaft which is not refined and used by applying high frequency hardening, with less occurrence of peeling during hobbing, having high surface hardness, impact value and torsional strength after high frequency hardening, and with less heat treatment strains during high frequency hardening, containing, on the mass % basis; C: 0.45-0.55%, Si: 0.10-0.50%, Mn: 0.50-1.20%, P: 0.025% or less, S: 0.025% or less, Mo: 0.15-0.25%, B: 0.0005-0.005%, Ti: 0.005-0.10%, and N: 0.015% or less, satisfying: 0.80?Ceq 0.95 and f value?1.0, and the balance of Fe and inevitable impurities, as well as a manufacturing method thereof.