Abstract: A coupling yoke for a double cardan joint includes: a pair of mutually facing flange portions each of which has a bearing hole for allowing a shaft portion, which is one of two shaft portions of each spider, to be rotatably installed and that protrude from each of both axial ends of a base portion in the axial direction. The base portion has a thick wall portion that couples the bearing holes of the diagonally arranged flange portions and that has an X shape when viewed in a direction along an axis of the shaft portion, which is the other one of the shaft portions of each spider and trimmed portions between adjacent thick portions of the X-shaped thick wall portion.

Abstract: A split outer ring of a split rolling bearing, which splits in a radial direction, includes a pair of split outer ring members which are each formed into a semi-cylindrical shape and which are formed into a cylindrical shape by being butted against each other at circumferential end portions. A pair of first flat plane portions which extend from both axial end edges of the end portions towards a center in parallel with an axis and a V-shaped recess portion, positioned between the first flat plane portions and is recessed in a circumferential direction relative to the pair of first flat plane portions, are formed at one end portion of the circumferential end portions which are butted against each other, and a pair of second flat plane portions which extend from the both axial end edges in parallel with the axis.

Abstract: In an electric power steering system, a control signal output section outputs independent dual-system control signals to driver circuits that are disposed in connection with independent dual-system motor coils. The control signal output section gives high priority to the output of the control signal to the other system, when the occurrence of energization failure is detected in one system. When the energization failure occurring phase is only one phase and the value of the basic command exceeds the upper limit of the priority command, the control signal output section outputs the control signal to the driver circuit in the system where the energization failure has occurred in order to supply electric power in which the two phases other than the energization failure occurring phase are used as the energized phases on the bases of the complementary command that corresponds to the excess of the upper limit.

Abstract: A rack guide unit includes a closure member secured to an external opening end of an accommodation portion of a housing, and a rack guide. Coned disc springs that urge the rack guide toward a rack shaft are interposed between the closure member and the rack guide. A protrusion of the closure member is passed through the coned disc springs and inserted in a recessed portion of the rack guide. An O-ring held in an accommodation groove formed in the outer periphery of the protrusion, at a position closer to the distal end of the protrusion than the coned disc springs are, functions as a retaining protrusion that restrains the coned disc springs from coming off the protrusion. For example, the coned disc springs and the closure member constitute a subassembly formed in advance.

Abstract: In an optical non-destructive inspection method which can perform inspection accurately in a short time. In the method, a heating laser beam source, at least one infrared detector, a control unit, and a storage unit are used. The storage unit stores a parameter state-time constant characteristic in which a parameter corresponding to a state of the measurement object is correlated with a time constant indicating the curve shape of the temperature rise characteristic that varies depending on the state of the parameter. The control unit determines the time constant based on the curve shape of the temperature rise characteristic, which extends from a heating start time point to a time point at which a saturated temperature is reached, and determines the state of the parameter of the measurement object based on the determined time constant and the parameter state-time constant characteristic.

Abstract: A rack guide unit includes a closure member secured to an external opening end of an accommodation portion of a housing, and a rack guide. A compression coil spring and a coned disc spring that urge the rack guide toward a rack shaft are interposed between the closure member and the rack guide. A holding member that holds the coned disc spring includes a guide tube that guides a radially inner portion of the coned disc spring and a seat plate that receives a load from the coned disc spring. An elastic member held in an accommodation groove formed in the outer periphery of the guide tube is frictionally engaged with the inner periphery (opposed portion) of a tubular portion of the rack guide.

Abstract: There is provided an electric power steering system that is able to generate a more appropriate current command value. Limits of an assist controlled variable, formed of multiple upper limits and multiple lower limits are individually set for multiple signals used to compute the assist controlled variable. The values obtained by adding the limits together are set as final limits of the assist controlled variable, that is, an upper limit and a lower limit. Thus, even if the assist controlled variable exhibiting an abnormal value is computed for some reason, the abnormal value of the assist controlled variable is limited to an appropriate value corresponding to each signal value by the final limits. By supplying the appropriate assist controlled variable to a motor control signal generating unit as a final current command value, an appropriate assist force is applied to a steering system.

Abstract: There is provided an electric power steering system that makes it possible to improve the driver's steering feel, and that includes a controller that controls driving of a motor. The controller computes a first assist component based on a steering torque. The controller computes a torque command value based on a basic drive torque that is the sum of the steering torque and the first assist component, and computes an assist compensation component through feedback control based on the torque command value. The controller computes a steered angle command value based on a value obtained by adding the assist compensation component to the basic drive torque, and computes a second assist component through feedback control based on the steered angle command value. The controller controls driving of the motor based on an assist command value that is the sum of the first assist component and the second assist component.

Abstract: A cage holds a plurality of balls such that the balls are arranged at intervals in the circumferential direction. The cage is allowed to be in contact with an outer ring, and a portion of the outer ring, with which the cage is brought into contact, is only an inner periphery raceway groove. The cage is located so as to be apart from an inner ring.

Abstract: A hydrostatic guide device includes: a fixed member having vertical guide faces; a movable member having vertical slide faces; a fluid supply device; a hydrostatic pocket to which a first fluid pressure based on a dimension of a gap is applied, and that urges the movable member with a first urging force; and a hydraulic pocket to which a second fluid pressure based on a dimension of a gap is applied, and that urges the movable member with a second urging force. A variation of the second fluid pressure is smaller than a variation of the first fluid pressure. When the first urging force and the second urging force are balanced with each other in a horizontal direction, the gap between the vertical guide face and the vertical slide face becomes a set value.

Abstract: A motor is driven by the ?-axis current of a ?? coordinate system that is an imaginary rotating coordinate system. A command current value preparation unit sets the ?-axis command current value based on the command steering torque and the detected steering torque. The command current value preparation unit includes a command current increase/decrease amount calculation unit and an addition unit. The command current increase/decrease amount calculation unit calculates the current increase/decrease amount for the command current value based on the sign of the command steering torque and the deviation of the detected steering torque from the command steering torque. The current increase/decrease amount calculated by the command current increase/decrease amount calculation unit is added to the immediately preceding value of the command current value by the addition unit. Thus, the command current value in the present calculation cycle is calculated.

Abstract: A steering column apparatus has a fixed bracket fixed to a vehicle body and having a pair of long holes extending parallel to each other along a backward-and-forward direction; a movable bracket arranged movably in the backward-and-forward direction; a pair of bolts and a pair of nuts for fixing the movable bracket to a rear portion of the fixed bracket so that the movable bracket can move in the backward-and-forward direction with respect to the fixed bracket; a spring plate having pressing portions for holding the movable bracket at the rear portion of the fixed bracket by pressing the fixed bracket against the movable bracket; a shear pin connecting the fixed bracket and the movable bracket at the rear portion of the fixed bracket; and first and second low friction elements. Upon a secondary collision, the movable bracket smoothly moves toward a vehicle front side together with the spring plate.

Abstract: A torque detection device includes: a magnetic flux collecting unit that includes an annular holder formed by resin molding and having a through-hole that passes through the holder in a radial direction, a first magnetic flux collecting ring and a second magnetic flux collecting ring that are fitted to an inner periphery of the holder so as not to cover the through-hole, and a magnetic shield that is fitted to an outer periphery of the holder so as to cover the through-hole; and a sensor housing that is made of resin supplied onto an outer periphery of the magnetic flux collecting unit, and that is formed so as to be integrated with the magnetic flux collecting unit.

Abstract: A command rotation speed is set to an initial rotation speed, and a forced commutation mode is started. In the forced commutation mode, a rotation speed is increased by a predetermined increase amount each time and forced commutation is executed until the rotation speed reaches a set rotation speed. Then, a switchover to the sensorless control mode is made when the rotation speed reaches the set rotation speed (S4) and a rotor position becomes detectable.

Abstract: A motor control device with which both high-accuracy current detection and improvement in voltage utilization factor are achieved is provided. When an ON time of any one of low potential side switching elements corresponding to respective phases in a driving circuit is shorter than a detection time of a current value, a microcomputer estimates a phase current value of a current undetectable phase based on current values of two phases other than the current undetectable phase corresponding to the said FET. Then, at the time of current detection using the blind correction, during current detection for two phases, other than the current undetectable phase, based on which the blind correction is performed, motor control signals for maintaining switching states of a switching arm corresponding to the current undetectable phase are output.

Abstract: A stationary tooth row is provided in a restricted member that is not displaced together with a steering wheel during tilt adjustment of a steering system. A movable tooth row is provided in a movable member that is displaced in a tilt direction) together with the steering wheel during tilt adjustment. The movable tooth row includes a first movable tooth and second movable teeth. A first curvature radius of a tooth tip of the first movable tooth is made smaller than a second curvature radius of a tooth tip of each of the second movable teeth to make a tooth depth of the first movable tooth greater than a tooth depth of each of the second movable teeth.

Abstract: The PLC communication system associated with the invention is characterized in that the system comprises a programmable logic controller (PLC), a plurality of processing devices, at least three communication processing nodes provided at the PLC and at the plurality of processing devices respectively to establish communication of the PLC and each of the processing devices and an interconnecting device and a plurality of communication lines for connecting the communication processing nodes with one another to establish data communication among the communication processing nodes. The PLC detects a state of communication failure and a display device displays an abnormal portion in a communication route based on the number of occurrences of the state of communication failure in respective interconnecting device and plurality of communication lines.

Abstract: A grinding machine includes: a grinding wheel of which movement in an X direction and a Z direction is controlled and that grinds a workpiece; and a truing unit that is installed at a predetermined position and that trues a machining surface of the grinding wheel. The truing unit includes: a movable table that is installed to be movable in the X direction relative to a support member; a truer that is rotatably installed in the movable table and that trues the machining surface of the grinding wheel; and an X-direction pressing mechanism that presses the truer in the X direction along with the movable table.

Abstract: A torque detector includes a permanent magnet, a pair of magnetic yokes, and a magnetic sensor. The magnetic yokes include a first magnetic yoke and a second magnetic yoke. The first magnetic yoke has a first ring and a plurality of first teeth extending from the first ring in an axial direction. The second magnetic yoke has a second ring and a plurality of second teeth extending from the second ring in the axial direction. The first teeth extend in the axial direction beyond the second ring of the second magnetic yoke. The second teeth extend in the axial direction beyond the first ring of the first magnetic yoke.

Abstract: A steering system includes a rack housing and a drainage device. The drainage device has a drainage case, and a drainage valve made of a resin. The drainage case has a case inlet port communicated with a housing space of the rack housing, case outlet ports communicated with the outside of the rack housing, a drainage space communicated with the case inlet port and the ease outlet ports, and a convex portion. The drainage valve has a valve body inlet port portion, and a valve body outlet port portion that interrupts communication between the case inlet port and the case outlet ports when the valve body outlet port portion comes into contact with the convex portion.