Abstract: A wheel bearing device of the invention includes a flanged shaft member that includes a shaft portion to which a rolling bearing is assembled, a fitting shaft portion that is formed on one end side of the shaft portion and that is fitted to a center hole of a wheel, and a plurality of flange portions that extend radially outward on an outer peripheral surface located between the shaft portion and the fitting shaft portion and each of which has a through bolt hole in which a hub bolt for fastening the wheel is arranged. Each flange portion of the wheel bearing device is formed by side extrusion when a forged recess is formed at a center of an end surface of the fitting shaft portion by cold forging. An edge portion of a cross-sectional shape taken perpendicularly to a longitudinal direction of each flange portion is formed in an R-chamfered shape.

Abstract: A valve device is installed on a gas tank and opens and closes a gas filling passage. The valve device includes: a housing having a housing portion therein; a first check valve that is fixed to the housing and has a through hole, through which the housing portion and the filling passage communicate with each other; and a valve pressing member. The housing has a filling port, through which the outside and the housing portion communicate with each other. The housing portion contains a filter, disposed between the filling port of the housing and the through hole of a passage member, and a valve element that is moved between the filter and the filling port by the flow of gas. When the gas in the gas tank flows into the housing portion, the valve element moved toward the filling port seats on a valve seat and closes the filling port.

Abstract: A fitting recess portion that connects fitting holes to each other is formed in a peripheral face of a ball screw nut. A circulation member includes a pair of fitted portions that are fitted in the fitting holes, and a connecting portion that provides communication between the fitted portions. A communication groove that has an opening on the fitted end side of the connecting portion and that extends in the axial direction is formed in the connecting portion. When the connecting portion is fitted in the fitting recess portion and the opening of the communication groove formed in the connecting portion is blocked by a bottom portion of the fitting recess portion, a second path that forms a return path together with first paths formed in the fitted portions is formed.

Abstract: A restriction plate is arranged at a position that is apart from a female screw portion by a distance shorter than a length of a portion of a male screw portion of an operation screw, which is screwed into a female screw portion of a plug body housing, along the axial direction in the valve-closed state. Therefore, when the operation screw is unscrewed, the operation screw contacts the restriction plate before the operation screw is completely unscrewed from the plug body housing.

Abstract: A sliding member has a base material whose surface is at least partially covered with a DLC film, wherein an intermediate layer is interposed between the base material and the DLC film, and the intermediate layer has a multilayer structure obtained by stacking a first Cr layer, a CrN layer and a second Cr layer successively from the side closer to the base material.

Abstract: In an electric power steering apparatus including a charge-discharge circuit 16 that selectively configures a first output mode in which only a main power supply including a battery 9 is used to supply an electric power to a motor 4 or a second output mode in which the main power supply and an auxiliary power supply 14 are used to supply the electric power to the motor 4, and a control circuit 6 that selects the output mode of the charge-discharge circuit 16 according to the electric power required for steering assist, the control circuit 6 selects the second output mode when the electric power required for steering assist in the first output mode becomes equal to or higher than an upward threshold value P1 or selects the first output mode when the electric power required for steering assist in the second output mode becomes equal to or lower than a downward threshold value P2 that is lower than the upward threshold value P1.

Abstract: Larger pre-tension is applied to each link such that residual compressive stress is larger at the portion of the link facing the inside of a chain than the outside. Assuming that for each of the links in a state that pre-tension is not applied, a predetermined pitch is P, a first inclination angle of a fixing portion of the front inserting portion with respect to a chain proceeding direction is ?, and a second inclination angle of a fixing portion of the rear inserting portion with respect to a chain proceeding direction is ?, when the pre-tension is applied to each of the links, the pitch changes into P+?P, the first inclination angle changes into ???? and the second inclination angle changes into ?+?? where ?P>0, ??>0, and ??>0.

Abstract: A cutting tip including a cutting edge portion made of a high-hardness material to take a thin-plate shape; and a support portion made of a material which is more worn in contact with a workpiece than the cutting edge portion not to exert a machining action on the workpiece even in contact with the workpiece, and securing and supporting the cutting edge portion on a reverse side of a rake face of the cutting edge portion. Thus, the width of flank wear is prevented from increasing and chipping of the cutting edge is prevented, so that the life of the cutting tip can be extended.

Abstract: There are provided a power transmission chain which can reduce a noise level further by eliminating unfavorable combinations from a random arrangement of combinations of pitch lengths and pin shapes and a power transmission system using the same power transmission chain. With respect to pitch length, links include two types of a link L1 which has a small pitch length and a link L2 which has a large pitch length. With respect to pin shape, pins include two types a pin P1 of which a curvature of a rolling contact surface is large and a pin P2 of which the curvature of the rolling contact surface is small. The links are arranged so that a possibility is avoided that a combination of (L2, P2) and a combination of (L2, P1) come immediately after a combination of (L1, P2) in a chain traveling direction, and that a possibility is adopted that a combination of (L1, P2) or a combination of (L1, P1) comes immediately after the combination of (L1, P2).

Abstract: A flange member 20, which is formed as a separate body from a motor shaft 6, is screwed to an end 6a of the motor shaft 6. The flange member 20 functions as a flange 19 of the motor shaft 6. A flange 18, which is formed at an end 13a of a ball screw nut 13, is fastened to the flange 19 of the motor shaft 6. This couples the ball screw nut 13 to the motor shaft 6. A coupling member 27 is arranged in the joint portion between the ball screw nut 13 and the motor shaft 6. The coupling member 27 is formed by a tubular portion 28 and a plate flange 29, which extends radially outward from the outer circumferential surface of an end of the tubular portion 28. The tubular portion 28 of the coupling member 27 is fixed to the motor shaft 6, and the plate flange 29 is fixed to the flange member 20.

Abstract: An electromagnetic absorber (10) for a vehicle including (a) a threaded rod (78) which is disposed on one of a sprung portion and an unsprung portion and which has a threaded groove (76) formed in its outer circumferential portion and an axial groove (90) extending in its axis direction (b) a nut (80) which is rotatably disposed on the other of the sprung portion and the unsprung portion and which is screwed with the threaded rod and (c) a rod-rotation inhibiting member (82) which includes a fitting portion configured to be fitted in the axial groove and which is disposed on the other of the sprung portion and the unsprung portion, the rod-rotation inhibiting member being configured to inhibit the threaded rod from rotating while permitting the threaded rod to move in the axis direction.

Abstract: The motor controller drives an electric motor including a rotor as a field magnet and stator coils of U-phase, V-phase and W-phase. The motor controller includes an exploration voltage application unit for applying an exploration voltage to the stator coils of U-phase, V-phase and W-phase such that a voltage vector expressed by the voltage applied to the stator coils rotates in a predetermined cycle with maintaining a constant magnitude, an electric current detection unit for detecting an electric current flowing through the electric motor during the period in which the exploration voltage is applied by the exploration voltage application unit, and a rotor rotation angle estimation unit for estimating a rotation angle of the rotor based on a phase of the voltage vector when a magnitude of the electric current detected by the electric current detection unit takes a local maximum value.

Abstract: A concave surface 60 is formed in an outer peripheral surface of each of pillar portions 26 of a cage 40. A plurality of recesses 42, 43, 52 and 53 are formed in outer peripheral surfaces of annular portions 24 and 25 of the cage 40. There are provided passageways 46, 47, 56 and 57 communicating respectively with the recesses 42, 43, 52 and 53. An axially-outer end of each of the passageways 46, 47, 56 and 57 is open to an axial inner end face of the annular portion 24, 25 or to the concave surface 60 of the pillar portion 26.

Abstract: An electric motor controller for controlling an electric motor that includes a rotor and a stator that faces the rotor.

Abstract: A steering apparatus comprises a bearing for supporting a pinion shaft so as to be rotatable and a high-rigidity member for holding the bearing in a state where it is positioned with respect to a housing. The housing comprises cylindrical first and second housings whose respective ends are fitted to each other. The first and second housings respectively comprise first and second receiving sections directly or indirectly receiving an outer ring of the bearing in an axial direction. The outer ring of the bearing is held between the high-rigidity member and the second receiving section, so that the axial movement of the bearing relative to the first and second housings is regulated.

Abstract: A manufacturing method for a brush that can reduce contact surface area between a commutator and the brush, thereby reducing frictional noise, is provided. Specifically, a method to manufacture a brush, which provides one surface with contact surfaces that make sliding contact with the commutator, involves a step to mold a molded body and a step to cut the molded body. In the molding process, carbon powder containing copper powder is sintered to form a molded body having a groove on the top surface along the direction of the axis of rotation of the commutator, and curved surface margins in the margins of the top surface in the direction of the axis of rotation. In the cutting step, the central part of the top surface of the molded body is cut by a grinding stone along the cutting direction to form contact surfaces between the margins of the top surface.

Abstract: Crowning is applied to a side surface of an inner ring which abuts against a side surface of a drive shaft in a radial direction. With this construction, when the two side surfaces abut against each other by a pressing operation of a threadedly-engaged nut at the time of connecting the drive shaft and an inner shaft, a contact pressure distribution of abutting surfaces is made generally uniform, thereby suppressing the occurrence of an edge load. By thus preventing a contact pressure from increasing at part of the abutting surfaces, energy released by a stick-slip phenomenon is reduced, and a sound pressure level of an abnormal sound generated at this time is reduced.

Abstract: An inventive ball bearing retainer (4) is entirely composed of a resin composition, and has pocket surfaces (6) for retaining balls (5) and projections (8) provided on the pocket surfaces (6) and containing a solid lubricant (CB). A ball bearing (1) incorporates the ball bearing retainer (4). By the effect of the solid lubricant (CB), the projections (8) are less liable to be worn out in a short period particularly when the ball bearing (1) is used in a higher temperature environment. The projections (8) define clearances between the balls (5) and the pocket surfaces (6), making it possible to maintain the effect of preventing noise, increase in the torque of the ball bearing (1), reduction of the service life of a lubricant and the like for a longer period of time.

Abstract: A rolling bearing has a metallic member sealing member at one axial end thereof. The sealing member has a first cylinder section including a first cylinder section facing surface which is in contact with an outer peripheral surface of an inner ring, a second cylinder section connected to the first cylinder section and including a second cylinder section facing surface which faces the outer peripheral surface of the inner ring, and a flange section connected to the second cylinder section via a bend section. In a state before the sealing member is press fitted in the bearing, a radial position of the second cylinder section facing surface is closer to the flange section than a radial position of the first cylinder section facing surface. The rolling bearing has another metallic member sealing member at another axial end thereof.

Abstract: It is an object of the present invention to provide a machine tool which can execute to machine the workpiece more precisely. A CNC 60, a servo driver 33 and a monitoring sensor 50 are connected to same simultaneous communication network 70. One of the CNC 60, the servo driver 33 and the monitoring sensor 50 functions as a master to output a periodical reference signal, and two remaining ones of the CNC 60, the servo driver 33 and the monitoring sensor 50 function as a slave to be input the reference signal from the simultaneous communication network 70 and to execute own processes on a basis of the reference signal.