Abstract: A housing has a screw shaft passing wall in which a through hole, through which a screw shaft passes, is formed. A spline outer cylinder is held at one end by the screw shaft passing wall, and a disc spring that biases the spline outer cylinder toward the screw shaft passing wall is arranged at the other end of the spline outer cylinder. A tapered recess is formed in one end face of the spline outer cylinder, and a tapered projection that is fitted in the tapered recess is formed in a face of the screw shaft passing wall of the housing, which faces the spline outer cylinder.

Abstract: A parallel mechanism adapted to control at least one of pivotal movement and linear movement of a link head having three degrees of freedom. The parallel mechanism has four actuators for driving the link head, and link groups which have four links connected to the four actuators, respectively, and each of which is connected to the link head. A rotation joint interposed between each of the link groups and the link head is made a linear joint which is connected to the link head so as to be relatively movable in one axis direction with respect to the link head.

Abstract: A disc-like grinding wheel 5 is formed with a circumferential groove 5a, the opposite walls of which define grinding surfaces 5b. A rotated carrier 3 brings a load pin 55 into rotary movement relative to the grinding wheel 5 rotated about an axis 5z, so as to pass the load pin 55 through space between the grinding surfaces 5b, whereby opposite end faces 55a of the load pin 55 are ground simultaneously. Thus, time taken by a grinding process may be reduced as compared with a conventional method wherein one end face is ground at a time.

Abstract: A permanent magnet included in a rotor of a brush-less motor is a radial anisotropic magnet in which multi-poles are magnetized in the circumferential direction and is skew magnetized along the axial direction in such a manner that a surface to one end part of an upper side from a central part in the axial direction and a surface to an end part of a lower side from the central part are axially shifted by a predetermined angle in the circumferential direction from each other. In accordance with this skew-magnetization, coggings including irregularly varying components generated in the rotor owing to the three-dimensional shapes of coil ends provided at opposite ends of a tooth 611a for fixing a winding have opposite phases to each other, so that the coggings are cancelled with each other. Accordingly, the coggings can be reduced or cancelled.

Abstract: For grinding one of axially spaced journal sections of a workpiece each having a cylindrical surface and a pair of shoulder surfaces extending radially outward from the opposite end portions of the cylindrical surface, a rotating grinding wheel is advanced to grind the shoulder surfaces of one journal section and then to grind the cylindrical surface of the one journal section. At the end of the cylindrical surface grinding, the grinding wheel is retracted by a fixed distance at a slow feed rate and is further retracted at a rapid feed rate. A rest shoe provided on the side opposite to the grinding wheel with the workpiece therebetween is advanced to an advanced position where the rest shoe contacts with another journal section axially spaced from the one journal section to decrease the flection of the workpiece caused by grinding resistance and is retracted away from said another journal section when the fixed-distance retraction of the grinding wheel is completed.

Abstract: A method of manufacturing a double row rolling bearing device includes: providing a collet chuck having radially expandable separated parts and a tapered cone for radially expanding the separated parts; inserting the radially contracted collet chuck into a through hole before the double row rolling bearing is caulked to the hub shaft; caulking the cylindrical end of the hub shaft, with the separated parts being in contact with the end by radially expanding the collet chuck to prevent radially inward plastic deformation of the end; and contracting the collet chuck and extracting the collet chuck out of the hub shaft after the caulking.

Abstract: A device is provided for assembling a tapered roller bearing, which allows even a tapered roller having a large taper angle to be easily assembled to a pocket of a cage. The tapered roller (35) is inserted into the pocket (33) with the larger-diameter side of the tapered roller (35) in the lead from the inner side of the cage (30) and moreover from the smaller-diameter annular portion side of the cage (30), by which the tapered rollers (35) are assembled to the cage (30).

Abstract: In an electric power steering system, multiple cutouts (45) are formed in a flange portion (36) formed on an axial end portion (23a) of a ball screw nut (23) of a ball screw device that drives a rack shaft. In addition, a motor shaft (6) has a thin-plate portion (44) that extends on the radially outer side of the ball screw nut (23). When the thin-plate portion (44) that extends from the motor shaft (6) is swaged into the cutouts (45) that serve as engagement recesses that have side walls in the circumferential direction, the rotation of the ball screw nut (23) relative to the motor shaft (6) is restricted.

Abstract: In an electric power steering system, a ball screw nut (23) of a ball screw device that drives a rack shaft is screwed to an axial end portion (6a) of a motor shaft (6) when a threaded portion (31) of a hollow threaded shaft (30) formed at an axial end portion (23a) of the ball screw nut (23) is screwed to a threaded portion (32) formed in the inner periphery of a motor shaft (6). A flange member (33) that is larger in diameter than the ball screw nut (23) is fitted to the outer periphery of the axial end portion (6a) of the motor shaft (6). The flange member (33) is formed in such a manner that when the rotation of the flange member (33) is restricted, the rotation of the ball screw nut (23) and the motor shaft (6) in the same direction is restricted when the ball screw nut (23) is screwed to the motor shaft (6).

Abstract: It is an object of the present invention to provide a controller for a machine tool and a five axis simultaneous control machine tool controlled thereby which can improve the machining accuracy in machining by controlling a driving axis including a linear axis and a pivoting axis. The controller comprises a detecting member 102 detecting a machining position where a pivoting axis is reversed in machining by the machine tool 1 based on the control data, an allowable position error setting member 103 setting an allowable position error ? between a commanded machining position P1 and an actual machining position P2, an allowable acceleration deciding member 107 deciding the allowable acceleration about the pivoting axis based on a distance L1, L2 from the machining position of the reversed axis to a center of the pivoting axis and based on the allowable position error ? being set, and a controlling member 108 controlling a velocity about the driving axis based on the allowable acceleration.

Abstract: In a motor controller, a current detection unit detects an electric current flowing through a brushless motor. An open loop control unit determines a command value indicating a level of a command voltage in accordance with a motor circuit equation, based on a command current value indicating an amount of electric current to be supplied to the brushless motor and an angular velocity of a rotor in the brushless motor. A correction unit calculates a correction value based on a difference between the command current value and a current value detected by the current detection unit when the electric current is detected by the current detection unit and corrects the command value according to the correction value, and corrects the command value according to the correction value even when an electric current is not detected by the current detection unit.

Abstract: A steering column includes a telescopic mechanism and an impact absorbing mechanism. The steering column includes an inner tube (6) that accommodates a steering shaft (8) and an outer tube (3) that is held by a housing (1) and that is coupled with the inner tube (6). A projecting portion (3a) is formed on an outer peripheral surface of a base end portion of the outer tube (3) and then the projecting portion (3a) is brought into contact with a tensioner bushing (4a) to thereby restrict movement of the outer tube (3) in a direction indicated by an arrow (a1), thus preventing the outer tube (3) from slipping off from the housing (1).

Abstract: A chain (1) includes plural links (2) and plural pairs of first and second pins (3 and 4) to couple the links each other. The first pin (3) comes into rolling and sliding contact with the second pin (4) at the contact portion (D). The first pin (3) includes a pair of end faces (17) opposing each other in the chain width direction (W), and a contact region (24) that comes into contact with the corresponding sheave surfaces of the pulley is formed in each end face (17). The contact region (24) includes the center point of contact (M). The first pin (3) includes a first type pin (3a) and a second type pin (3b). When the linear region of the chain (1) is viewed in the chain width direction (W), the relative position of the contact portion (D) and the center point of contact (M) is different between the first type pin (3a) and the second type pin (3b).

Abstract: A protruding portion is formed integrally on an outer ring in such a manner as to protrude from an outer raceway surface toward an inner raceway surface. A sliding portion is formed on an inner ring as a separate element from the inner raceway surface in such a manner as to protrude from the inner raceway surface toward the outer raceway surface. Due to the sliding portion being brought into contact with the protruding portion during a relative rotation of the inner ring and the outer ring, the sliding portion is formed by applying an elastic material such as rubber to the inner raceway surface by heating or bonding.

Abstract: A drawn cup roller bearing includes: an outer ring including a raceway surface; a first rib formed at one end of the outer ring by being bent substantially perpendicular to the raceway surface; a second rib formed at the other end of the outer ring by being bent inwardly so as to be substantially parallel to the raceway surface; a cage including pockets for holding rollers, respectively; and an annular projection stopper which is projected radially outwardly and provided over an entire outer circumference at a pocket side position of an outer circumferential surface of the cage. An end surface of the cage abuts against a part of the first rib and the annular projection stopper is interposed between an end surface of the second rib and the rollers in a state that the cage is assembled into the outer ring.

Abstract: In a power transmission chain, an increase in rigidity in connection between pins and pulleys, a reduction in looseness of the pins when the pins bite into the pulleys, a reduction in driving noise and a further increase in practical durability are attained. A chain 1 which is wound round on a pair of pulleys so as to extend therebetween includes a plurality of links 2 and a plurality of connecting members 50. A first pin 3 and a second pin 4 of the connecting member 50 are brought into rolling and sliding contact with each other at a contact portion T which is displaced in association with a change in a flexing angle between the links 2. End faces 17 of the first pin 3 each have a projecting curved portion 20 where a contact area 21 is formed when the end faces 17 are brought into contact with sheave surfaces of the pulleys.

Abstract: An electric power steering apparatus drives a motor to generate a steering assist force according to a steering torque and includes an output circuit for supplying the motor with electric power from at least one of a battery and an auxiliary power supply. The electric power steering apparatus has a control circuit which at or after detection of a breakdown of the battery, determines a length of time to the end of steering assist (decreasing time t1) based on the amount of energy stored in the auxiliary power supplies and which takes the determined length of time to perform output decreasing control to gradually decrease the upper limit of power supplied for the steering assist to practically zero according to a constant gradient. Thus is provided an electric power steering apparatus which is adapted to prevent a sudden fall of the steering assist force in the event of a battery breakdown while effectively utilizing the available stored energy.

Abstract: There is provided a steering apparatus including a pinion communicating with an operation of a steering member, a rack shaft having a rack meshed with the pinion, and a support yoke resiliently coming into contact with the rack shaft, and being configured to convert rotation of the pinion into movement of the rack shaft in an axial direction in a meshing portion in which the pinion and rack mesh to each other. The steering apparatus comprises a detection unit for detecting a force applied to the support yoke to which a force acting on the meshing portion being transmitted from the rack shaft and a calculation unit for calculating a steering torque applied to the steering member based on the force detected by the detection unit, wherein the pinion and the rack are formed in helical gears.

Abstract: A torque detecting apparatus includes two magnetism collecting rings cylindrical portions enclosing a magnetic circuit forming member provided on a rotating body and a magnetism sensitive device disposed between the protruding pieces protruding from parts of the cylindrical portions in an radially outward direction of the cylindrical portions. It includes a regulating body for regulating a relative position between the magnetism sensitive device and the protruding pieces respectively. This regulating body includes two inserting recesses into which each of protruding pieces is inserted respectively, each recess having a prismatic shape. It also has a connecting part connecting inner edges of apertures of the inserting recesses to each other. It also has a holding part holding the magnetism sensitive device between the inserting recesses.

Abstract: A method of manufacturing a rolling bearing device for a road-wheel that includes an outer ring, an inner ring member, rolling elements arranged between the outer ring and the inner ring member, and a shaft body having the inner ring member mounted to an outer periphery includes a caulking step of radially outwardly bending and deforming a cylindrical portion formed at one end side of the shaft body by using a predetermined caulking pressure acting from the one end side toward other end side of the shaft body, thereby forming a caulked portion caulked to an axial end face of the inner ring member. Identification information indicating an existence of the caulked portion so formed is die-stamped on a visually observable surface at the other end side of the shaft body by using the caulking pressure during the caulking step.