Abstract: An electric power steering system includes an electric motor and a worm speed reducer. The worm speed reducer includes a worm shaft, a worm wheel, and a ring member. The worm wheel includes an annular tooth portion and an annular support formed of a material that is softer than a material of a shaft. The ring member includes an outer periphery press-fitted with the annular support so as to form plastically deformed portions in part of the annular support, and an inner periphery with which the shaft is press-fitted. The ring member is formed of a material with a hardness equivalent to a hardness of the material of the shaft.

Abstract: A steering system includes an upper bracket having a first tooth row, a rigid tooth member, a second tooth row provided on the tooth member, a first moving member, and an elastic member disposed between the tooth member and the first moving member. The first tooth row includes a plurality of first teeth. The second tooth row includes a plurality of second teeth. The elastic member exerts a constant restoration force. The second tooth row meshes with the first tooth row when the first teeth and the second teeth are alternately arranged in a tilt direction.

Abstract: A driving force transmission device includes: a clutch unit that connects and disconnects input and output shafts to and from each other; an annular electromagnet disposed so that it can rotate relative to a shaft body portion included in the input shaft; a rotor that faces one side in the axial direction of the electromagnet; an armature that faces one side in the axial direction of the rotor, that is disposed so that it can move in the axial direction, and that moves in the axial direction to engage and disengage the clutch unit; an internally threaded portion that is formed on the inner periphery of the rotor and engages with an externally threaded portion formed on the outer periphery of the shaft body portion; and a second elastic member that elastically presses the rotor screw-fitted on the outer periphery of the shaft body portion toward the electromagnet.

Abstract: A recessed portion is formed in an inner wall surface of a lower portion of a reduction gear housing (a lower wall in FIG. 2) in the direction of gravity and between a bearing 44 and an outer wall of the reduction gear housing (a right side wall in FIG. 2). The recessed portion is formed to have such a depth that the recessed portion does not penetrate the reduction gear housing. The recessed portion is formed in the reduction gear housing within a given range in a circumferential direction with respect to the axis of a rack shaft serving as the center. A moisture sensor is mounted in the recessed portion to detect water infiltrating into a housing. The moisture sensor has a transmission circuit that operates using a water battery as a power supply source. The water battery generates power when water flows into the water battery.

Abstract: A sealing rubber composition includes acrylic rubber, artificial graphite, and coupling agent.

Abstract: A method of making a shaft includes: forming a shaft portion by applying drawing to a first region, of a columnar material made of steel, extending from a predetermined position in an axial direction to an end on a first side in the axial direction, to form a shaft portion, and to form a tapered portion between the shaft portion and a second region, of the columnar material, extending from the predetermined position to an end of the columnar material on a second side in the axial direction, and having an outside diameter increased as the tapered portion extends from the shaft portion side toward the second region side; and forming a head portion by applying plastic forming to the second region and the tapered portion.

Abstract: In a steering system, a guide member faces the rack shaft on the opposite side of the rack shaft from the pinion shaft, and an opposed member faces the guide member at a first distance. The rack shaft is supported by the first rack bush so as to be slidable in the axial direction. The rack shaft is supported so as to be slidable in the axial direction X at a position closer to the guide member than the first rack bush is by the second rack bush disposed away from the inner surface. An elastic member that can be elastically deformed is disposed between the inner surface and the second rack bush. The second rack bush has an opposed portion disposed on the opposite side of the rack shaft from the pinion shaft and facing the inner surface at a second distance that is larger than the first distance.

Abstract: A control device in an electric power steering device calculates a first assist component based on steering torque and a vehicle speed. The control device also calculates a compensation component associated with an reverse input and calculates a steered angle command value based on an addition value of the compensation component and basic drive torque that is an addition value of the steering torque and the first assist component, produces a second assist component by performing steered angle feedback control that causes the steered angle of a vehicle to follow the steered angle command value. The control device controls drive of a motor based on an assist command value that is an addition value of the first assist component and the second assist component.

Abstract: The valve unit includes: a body having a charging passage; a supply-side joint that connects a supply pipe; and a check valve that is disposed in the gas passage, and that inhibits gas from being discharged from the gas tank to the outside of the body. The check valve includes a check valve seat, a check valve element that comes into contact with or moves away from the check valve seat, and a positioning member that fixes the position of the check valve seat in the charging passage. The body has a fitting hole which is communicated with the charging passage and in which the supply-side joint and the positioning member are fitted. The positioning member is fitted in a second fitting hole so as to fix the position of the check valve seat even when the supply-side joint has not been fitted in a first fitting hole.

Abstract: The electromagnetic frictional engagement apparatus includes a housing member in which a housing space is formed, a clutch portion that couples the housing member in a disengageable manner to a shaft disposed so as to be rotatable relative to the housing member, and an electromagnetic coil that generates a magnetic force that actuates the clutch portion. The clutch portion has an outer clutch plate and an inner clutch plate that forms a magnetic path for a magnetic flux generated by the electromagnetic coil. Lubrication grooves through which a lubricant flows are formed in the inner clutch plate. Among the lubrication grooves, the total of groove areas of a portion of the lubrication grooves that is included in the magnetic path is 90 to 110% of a maximum lubrication groove area, so that magnetic flux density resulting from saturation of the magnetic path with magnetic fluxes is not reduced.

Abstract: A split type cage includes: a pair of annular portions including recess portions formed on an inner periphery side at intervals in a circumferential direction; and a pillar portion which includes pillar end portions on both end sides in an axial direction and fitted in the recess portions, and on which a reaction toward an other side in the circumferential direction acts. The recess portion includes a wedge-shaped surface forming a wedge-shaped space, which becomes narrower in a radial direction toward the other side in the circumferential direction, between the wedge-shaped surface and an outer peripheral surface of an inner ring. The pillar end portion has a wedge shape in which a radial dimension decreases toward the other side in the circumferential direction, and includes a radial outside surface contacting the wedge-shaped surface and a radial inside surface contacting the outer peripheral surface of the inner ring.

Abstract: A shaft coupling structure includes a rotating shaft, a worm shaft, a first member, a second member, and an intermediate member that is an elastic member. The intermediate member is interposed between the first member and the second member. Coupling protrusions of the first member that extend in an axial direction are each inserted between second radial protrusions of the intermediate member and between a plurality of first radial protrusions of the second member. Protruding portions of the first radial protrusions engage with the corresponding recessed portions of the second radial protrusions in the axial direction. When a relative rotation angle between the first member and the second member is smaller than a predetermined angle, ends of each of the second radial protrusions in a circumferential direction each projects in the circumferential direction with respect to a corresponding end of the corresponding first radial protrusion in the circumferential direction.

Abstract: A driving force distribution control apparatus includes: a driving force transmission device including a clutch which can change distribution of a driving force to front wheels and rear wheels of a four-wheel drive vehicle; and a controller which controls an engagement force of the clutch in accordance with a traveling state. The controller includes a different-diameter tire detector which detects an attachment of a different-diameter tire to one of the front wheels and the rear wheels when a rotation speed ratio between the front wheels and the rear wheels continues to be equal to or larger than a reference rotation speed ratio for a predetermined time. The different-diameter tire detector performs detection of the attachment of the different-diameter tire when it is determined that the wheels are unlikely to slip based on an outside condition.

Abstract: A cage includes a pair of annular rings and a plurality of cage bars, and an area enclosed by the pair of annular rings and the circumferentially adjacent cage bars that serves as a pocket that holds the roller. The cage further includes a tab provided so as to protrude from a radially outer area of the cage bars to prevent the roller in the pocket from slipping out through the pocket toward a radially outer side. A surface of a bottom portion of the tab is discontinuous with surfaces of the cage bar, which are located on both sides of the tab in a longitudinal direction.

Abstract: In a steering system, a pair of first tooth rows that is movable integrally with an upper jacket includes first teeth each of which has a tooth trace extending in an up-down direction Z and which is arranged at a pitch in an axial direction. A tooth member shaped by compression molding includes a pair of second teeth provided on respective side surfaces of a pair of side surfaces of a body portion supported by a lower jacket, the side surfaces extending parallel to each other. The second teeth mesh with the respective first tooth rows in accordance with operation of an operation member that regulates extension and contraction of a column jacket. The second teeth have tooth tips displaced from each other by a distance shorter than a predetermined pitch.

Abstract: In a vehicular steering system, a steering wheel (steering member) operated for steering and a steering operation mechanism are not mechanically coupled together, and the steering operation mechanism is driven by a steering operation motor. The vehicular steering system includes a reaction force motor that applies a reaction force to the steering member, and a reaction force motor control unit that controls the reaction force motor. The reaction force motor control unit includes a torque limiter that limits a current flowing through the reaction force motor to a predetermined value or smaller during automatic operation.

Abstract: A lubricant supply unit that supplies lubricating oil to a raceway groove of an inner ring is fixed to an outer ring. The lubricant supply unit is provided with a first and second radially separated electrodes used to supply electric power from an external power source to the micropump. Each of the first and second radially separated electrodes is fixed to an outer face of a tank that is stationary relative to the micropump so as to be exposed on the outside of the lubricant supply unit. The first radially separated electrode is arranged so as to be apart from the second radially separated electrode.

Abstract: A ball bearing includes an inner ring having an outer periphery in which an inner raceway groove is formed, an outer ring having an inner periphery in which an outer raceway groove is formed, a plurality of balls interposed between the inner raceway groove and the outer raceway groove, and an annular cage that holds the balls. The cage includes an annular portion positioned on one side in an axial direction with respect to the balls and a plurality of cage bar portions that extend from the annular portion toward the other side in the axial direction. Each cage bar portion has a guide portion that positions the cage by coming into contact with the inner raceway groove in a non-contact area other than an area in which the corresponding ball is in contact with the inner raceway groove.

Abstract: A steering control device restrains not only a steered angle but also a steering angle from exceeding their upper limit values. A maximum value selection circuit selects a maximum value of a target steered angle and a target steering angle as an end angle and outputs the end angle to a limiting reaction force setting circuit. The limiting reaction force setting circuit increases a limiting reaction force rapidly if the end angle becomes equal to or larger than a common threshold. A target steering angle setting circuit sets a target steering angle based on torque applied to the steering minus the limiting reaction force etc. A steering angle control circuit sets reaction torque as a manipulated variable for feedback controlling the steering angle to the target steering angle. An operation signal generation circuit outputs an operation signal to a reaction force motor so as to achieve the reaction torque.