Abstract: A rolling/sliding member used for a toroidal continuously variable transmission according to the present invention is made of steel containing at least C: not less than 0.8 wt % and not more than 1.5 wt %, Si: not less than 0.9 wt % and not more than 2.1 wt % and Cr: not less than 2 wt % and not more than 5 wt %, and by applying surface hardening through machining to a surface whose surface hardness is set to not less than 60 HRC and not more than 64 HRC through quenching/tempering, surface compression residual stress thereof is set to not less than 700 MPa and not more than 1100 MPa. Furthermore, the amount of reduction of surface hardness when heated at 300° C. is set to not more than 1 HRC.

Abstract: An electric power steering system is provided which is capable of providing a favorable steering feeling without using compensation logics such as of inertia compensation and friction compensation. The electric power steering system includes road-noise suppression control means (213) for controlling a steering assist motor (9) in a manner to damp torque transmission in a higher frequency region representing road noises than a frequency region representing road information. A friction value of a steering mechanism (A) is decreased enough to allow the intrinsic vibrations of the steering mechanism (A) to appear. Rotor inertia of the steering assist motor (9) is set to a value small enough to allow the frequencies of the intrinsic vibrations to be present in the frequency region where the torque transmission is damped by the road-noise suppression control means (213).

Abstract: A cage of a thrust roller bearing includes: a pair of crank-shaped bent portions arranged in a circumferential direction of the cage; a pair of inner wall surfaces arranged in a radial direction of the cage; and a pocket for housing a roller defined by the pair of bent portions and the pair of inner wall surfaces and formed by punching the cage. Radially inner one of the inner wall surfaces is formed as a guiding surface for guiding a substantial roller PCD position of an end surface of the roller. Each of the pair of bent portions includes a first extended portion extending in one of cage thickness directions and a second extended portion extending in the other cage thickness direction. A roller retaining pawl for retaining the roller is provided at each of the first and second extended portions so as to protrude into the pockets.

Abstract: An electric power steering apparatus includes a worm interlockedly connected to an output shaft of an electric motor, a first and a second bearing each supporting the respective side of the worm in a housing, and a gear wheel meshed with the worm. The housing includes a fitting bore in which the first bearing supporting a side of the worm closer to the electric motor is to be fitted, and an annular retaining portion located at a position corresponding to the second bearing and eccentrically oriented with respect to the center (axial center) of the fitting bore in a direction that shortens a distance L between the center of rotation of the worm and that of the gear wheel, and the annular retaining portion retains a coil spring around an outer circumference of the second bearing.

Abstract: A detection signal of sound or vibration detected at an evaluation point is filtered so that an evaluation waveform signal is extracted. Then, a mother wavelet is derived using this. On the other hand, each of detection signals of sound or vibration detected at a plurality of candidate points is filtered so that each candidate waveform signal is extracted. These candidate waveform signals are processed by wavelet transformation using the derived mother wavelet. Then, on the basis of the result, instantaneous correlation is calculated between each candidate waveform signal and the mother wavelet. Then, on the basis of mutual comparison of the calculated instantaneous correlation, a generation source of the sound or vibration that appears at the evaluation point is identified.

Abstract: A steel part having a long rolling contact fatigue life and capable of further increasing the life of a bearing under severer using condition than usual conditions. The steel part includes steel having a composition containing 0.7% by mass to 1.1% by mass of C, 0.5% by mass to 2.0% by mass of Si, 0.4% by mass to 2.5% by mass of Mn, 1.6% by mass to 5.0% by mass of Cr, 0.1% by mass to less than 0.5% by mass of Mo, 0.010% by mass to 0.050% by mass of Al, less than 0.0015% by mass of Sb as an impurity, and the balance composed of Fe and inevitable impurities, the steel being hardened and tempered. In the steel structure of a portion from the surface to a depth of 5 mm, residual cementite has a grain diameter of 0.05 to 1.5 ?m, prior austenite has a grain diameter of 30 ?m or less, and the ratio by volume of the residual austenite is less than 25%.

Abstract: A rolling bearing assembly includes: an outer ring member; an inner ring member; a hub wheel formed with a flange at one axial end thereof; and a seal member for sealing a space between one axial end of the outer ring member and an inside surface of the flange, which axially opposes the one end of the outer ring member. The seal member includes: a cylindrical core fitted on the one axial end of the outer ring member and axially extended from the one end toward the flange; and an annular lip portion secured to the core and formed from an elastic material as axially extended from the core to the inside surface of the flange.

Abstract: A slide guiding device in a machine tool includes slide guiding surfaces provided on a bed, sliding surfaces provided on a column, which is guided on the bed for movement on the same, and movable on the slide guiding surfaces, oil grooves each with a first supply hole for supplying lubrication oil to contact surface areas between the sliding surfaces and the slide guiding surfaces, and oil pockets formed independently of the oil grooves for retaining the lubrication oil supplied to the contact surface areas between the sliding surfaces and the slide guiding surfaces.

Abstract: A constant velocity joint 10 comprises an outer race 12, an inner race 11, balls 14 and a cage 13. The outer race 12 has a partially spherical inner surface 12a provided with plural outer ball grooves 12b. The inner race 11 has a partially spherical outer surface 11 a provided with plural inner ball grooves 11b arranged to correspond to the outer ball grooves 12b. The balls 14 are interposed between the outer ball grooves 12b and the inner ball grooves 11b. The radial distance of the outer ball grooves 12b from the rotational axis of the outer race increases toward an opening end of the outer race 12 in a predetermined zone H, and a contact angle ? between each ball 14 and each outer ball groove 12b decreases toward the opening end of the outer race 12 in the predetermined zone H.

Abstract: A roller bearing (needle roller bearing) of the cage-and-roller type for a planetary gear mechanism includes a plurality of rollers (needle rollers), and a cage positioning and holding these rollers, and an outside diameter surface of the cage is guided by a bore diameter surface of a planetary gear. An outside diameter dimension of the cage is set to a value which is not smaller than 95% and not larger than 97% of an inner diameter dimension of the planetary gear.

Abstract: A stator of a motor according to the invention includes a stator core 1 annularly continued, a plurality of insulators each having a body part which is engaged with an outer peripheral surface of a tooth part of the stator core and a flange part which is projected at a distal end side of the tooth part, and a coil which is wound around the tooth part by way of the insulator. A first magnetic body is provided on a surface of the flange part of the insulator opposed to a rotor, in a state magnetically connected to the tooth part.

Abstract: In a double row ball bearing disposed around a pinion shaft to support the same, at least an inner ring member out of its inner and outer ring members is applied to a carbonitriding surface treatment, and hardness of at least inner ring raceway surfaces of the inner ring member is substantially the same as hardness of balls. With this construction, the bearing has an excellent load-withstanding performance, so that the lifetime of the bearing is prolonged.

Abstract: An electric power steering system includes: a band-stop filter 15a having a transfer function G1(s) for suppressing resonance, and a phase compensator 15b having a transfer function G2(s). The above function G1(s) is represented by an expression G1(s)=(s2+2?11?1+?12)/(s2+2?12?1+?12), where s: a Laplace operator, ?11: a damping coefficient, ?12: a damping coefficient, and ?1: an angular frequency. On the other hand, the above function G2(s) is represented by an expression G2(s)=(s2+2?21?2+?22)/(s2+2?22?2+?22), where s: a Laplace operator, ?21: a damping coefficient, ?22: a damping coefficient, and ?1: an angular frequency. Furthermore, the above damping coefficients ?21, ?22 satisfy an expression ?2124 ?22?1. Thus, a filter such as a phase compensator may attain a design freedom while preventing the increase of arithmetic load, whereby both the suppression of resonance and a good assist response in a normal steering speed region, for example, may be achieved.

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: An electric power steering apparatus is provided with a worm which is a driving gear interlocked with an electric motor for assisting steering, and a worm wheel which is a driven gear having an annular teeth body made of synthetic resin meshing with the worm and a metallic core body coupling the annular teeth body and is attached to the steering shaft. Protrusions are provided on a side surface of the annular teeth body in a face width direction at a plurality of circumferential positions from which a distance to a center of rotation is different from each other, and stirred lubricating fats and oils applied around the worm wheel. As a result, the lubricating fats and oils can be moved to between tooth surfaces of a meshing portion between the worm and worm wheel.

Abstract: An annular recess 73 is provided in a fitting hole 71 of a bracket 7 into which a cylinder tube 53 of a housing is fitted that accommodates a steering drive shaft capable of moving in right and left directions of a car body in response to a steering operation and that has the cylinder tube 53 made of metal, while a part of the cylinder tube 53 ranging from an inner periphery surface to an outer periphery surface is bent into said recess 73, so that an escape preventing protrusion 8 is provided, thereby increasing an escape preventing strength of the bracket 7. This increases the escape preventing strength of the bracket joined to the cylinder tube, without generation of thermal distortion in the cylinder tube. Further, the components such as the steering drive shaft can be assembled without disturbance from said bracket.

Abstract: An electric power steering apparatus comprises a transmission mechanism for transmitting driving force of a steering assisting electric motor to a steering mechanism. A driven gear of the transmission mechanism is rotatably supported by first and second bearings. One of the first and second bearings includes an inner ring coupled so as to be rotatable together with an output shaft of a steering shaft, an outer ring held on a housing, and a rolling element interposed between the inner ring and the outer ring. One of the inner ring and the outer ring includes an annular elastic plate giving a preload to the rolling element.

Abstract: An annular seal, tapered rollers and a retainer are arranged on the outer peripheral surface on the flange section side of an inner shaft to form an inner shaft assembly. An annular spacer capable of being split in the circumferential direction is arranged between the flange section of the inner shaft and the annular seal. With the annular spacer supporting the annular seal, an outer ring is pushed into the inner shaft assembly to assemble the annular seal to the outer ring, and then the annular spacer is split and taken out.

Abstract: Front and rear wheels Tf, Tr of a motor vehicle driven by an engine 10 are connected through a differential control device 15 which is capable of varying the torque to transmit. When the turning radius of a predetermined one wheel or the motor vehicle is equal to or smaller than a predetermined turning radius, the transmission torque of the differential control device is decreased by a control device to prevent the tight-corner braking phenomenon from occurring. When the motor vehicle is stopped momentarily with the transmission torque being lowered, the control device maintains the transmission torque as it is, and the vehicle is then restarted with the transmission torque being lowered. Thus, when the motor vehicle which was stopped momentarily with a large steering angle is then restarted, the tight-corner braking phenomenon can be prevented from occurring from the beginning of the restarting.

Abstract: In a steering apparatus, in accordance with a grip limit control process (30b?), it is determined whether or not a grip degree ? estimated by a grip degree estimation arithmetically operating process (30a) is less than a predetermined grip degree (??), and in the case that it is determined that an estimated grip degree (?) is less than the predetermined grip degree (??), the process applies such a feeling that a steering operation by a steering wheel suddenly becomes light to a driver, by suddenly increasing an assist quantity by a motor (M), thereby notifying the driver of the matter that the grip degree of a steered wheel is close to a limit. Therefore, it is possible to transmit to the driver a probability that a side slip is generated by further turning the steering wheel 21 in the same direction as the current direction, thereby calling the driver's attention for steering.