Patent application number | Description | Published |
20130028550 | BEARING APPARATUS - A bearing apparatus to be supported by an axle box which includes a key groove, the bearing apparatus includes an outer ring which includes a first key groove extending from an inner diameter to an outer diameter of an axial end surface of the outer ring, an inner ring, rolling elements rollably interposed between the outer and inner rings, and a key member which includes an annular body, a first inwardly projecting part which is provided on the annular body and adapted to be inserted into the first key groove of the outer ring, and an outwardly projecting part which is provided on an outer periphery of the annular body and adapted to be inserted into the key groove of the axle box. | 01-31-2013 |
20130079183 | POWER TRANSMISSION CHAIN AND POWER TRANSMISSION DEVICE - A power transmission chain includes a plurality of links respectively having front and rear insertion parts into which pins are inserted, a plurality of first pins and a plurality of second pins which are arranged in front and back for connecting the links A plurality of the links includes two types of the links having different pitch lengths, wherein provided that a radius of a pulley shaft is RA, a radius of curvature of a face of the link having a shorter pitch length at an inner diameter side of the chain is RS, and a radius of curvature of a face of the link having a longer pitch length at an inner diameter side of the chain is RL, relation is set to be RA≦RS≦1.5 RA, and RS03-28-2013 | |
20130092498 | ELECTROMAGNETIC CLUTCH - An electromagnetic clutch includes: a rotary member; an output mechanism including an electromagnetic coil and an armature moved toward the electromagnetic coil by electromagnetic force; a cam mechanism operated by rotation of the rotary member in the electromagnetic coil energized state; and a coil housing having a coil accommodating portion open toward the armature and accommodating the electromagnetic coil. The coil housing and the armature have frictional engagement faces. The frictional engagement faces of the coil housing and the armature are frictionally-engageable. At least one of the coil housing and the armature has a contact pressure reducing portion for reducing contact pressures of the frictional engagement faces of the coil housing and the armature, generated based on cam thrust generated through an operation of the cam mechanism when the frictional engagement faces of the coil housing and the armature are frictionally-engaged. | 04-18-2013 |
20130092502 | CLUTCH DEVICE - A clutch device includes; i) a clutch mechanism including a friction engagement member capable of rotating relative to a rotating member and a clutch member that is supplied with restoration force in a direction in which the clutch member departs from the friction engagement member by a restoration spring; and ii) a cam mechanism including; a cam member that is arranged in parallel to the clutch mechanism along a rotation axis line of the rotating member and that is incapable of rotating relative to the rotating member; and a cam follower capable of rolling on a cam surface that exists between the cam member and the clutch member. The cam angle is set to make torque applied to the clutch member due to reaction force accompanied by friction engagement with the friction engagement member larger than torque applied to the clutch member by thrust force caused by an activation of the cam mechanism. | 04-18-2013 |
20130116890 | VEHICLE STEERING SYSTEM AND MATERIAL HANDLING VEHICLE - A steering angle detecting unit, a reaction force actuator that applies steering reaction force to a steering member, a yaw angle detecting unit that detects a yaw angle of a vehicle body, and a reaction force actuator control unit that sets the steering reaction force as a function of a steering angle and that controls the reaction force actuator such that the reaction force actuator generates the set steering reaction force, are provided. The reaction force actuator control unit computes a turning angle of the vehicle body on the basis of a change in the yaw angle of the vehicle body, detected by the yaw angle detecting unit. When the computed turning angle is larger than or equal to a reference angle, the steering reaction force applied to the steering member is increased. | 05-09-2013 |
20130118826 | POWER STEERING SYSTEM - A power steering system includes: a hydraulic cylinder that generates a steering assist force; a hydraulic control valve that has a spool that adjusts the state of supply and drainage of the hydraulic fluid to and from the hydraulic cylinder based on a position of the spool; a driving unit that displaces the spool by driving the spool with a predetermined driving force; and a determination unit that determines that there is an abnormality in the hydraulic control valve when the driving force for displacing the spool falls outside a predetermined range. | 05-16-2013 |
20130118827 | ELECTRIC POWER STEERING SYSTEM - An electric power steering system includes elastic members arranged at respective axial ends of a first bearing by which a motor shaft that serves as a hollow shaft is rotatably supported and which elastically support the first bearing relative to a rack housing in the axial direction; and a support member disposed on the outer periphery of the first bearing to support the first bearing with displacement of the first bearing in the radial direction restricted. The motor shaft is disposed so as to move relative to the rack housing in the axial direction as the first bearing slides relative to the support member while elastically deforming the elastic members and a second bearing moves in the axial direction. | 05-16-2013 |
20130134816 | ROTOR FOR MOTOR AND METHOD FOR MANUFACTURING THE SAME - Non-holding portions of a holding ring are demagnetized by supplying a nonmagnetic element to the non-holding portions while melting the non-holding portions by the application of heat. Each non-holding portion is demagnetized such that, from the melting center toward each melting end portion thereof, the material of the non-holding portion moderately changes from a nonmagnetic material to a ferromagnetic material. The permeability moderately changes, and hence generation of cogging torque during rotation of a rotor is suppressed. | 05-30-2013 |
20130134817 | ROTOR FOR MOTOR AND METHOD OF MANUFACTURING THE SAME - At least part of each bridge portion is heated and molten to form a keyhole, and a nonmagnetic element is disposed around the keyhole. Thus, even when the width of the bridge portion in the radial direction is increased, the bridge portion is demagnetized. Therefore, leakage flux in the bridge portion is reduced, and the output power of a motor is increased. Moreover, by increasing the width of the bridge portion in the radial direction, the strength of the bridge portion is increased, and breakage of the bridge portion due to a centrifugal force at high-speed rotation of a rotor is prevented. | 05-30-2013 |
20130134827 | METHOD FOR MANUFACTURING STATOR FOR MOTOR AND STATOR FOR MOTOR - Teeth coupling portions of a ring-shaped teeth member are demagnetized by supplying a nonmagnetic element to the teeth coupling portions while melting the teeth coupling portion by application of heat. Then, an inner peripheral portion of the ring-shaped teeth member is pressed radially outward. Therefore, it is possible to plastically deform the teeth coupling portions easily, so that the ring-shaped teeth member and a ring-shaped yoke member are easily fitted together. Accordingly, there is provided a method for manufacturing a stator for a motor, in which the amount of leakage flux is reduced and which has favorable magnetic characteristics. | 05-30-2013 |
20130137341 | ACTUAL GRINDING DEPTH MEASUREMENT METHOD, MACHINING METHOD, AND MACHINE TOOL - In a machining method of supporting a workpiece having a cylindrical machined portion such that the workpiece is rotatable and feeding a grinding wheel in a radial direction, a start diameter that is a diameter including a measurement start point on a surface of the machined portion is measured, and, after the measurement start point passes through a machining application portion, an end diameter that is a diameter including a measurement end point is measured. An actual grinding depth at the time when the measurement start point is machined is computed by the equation, U=|D | 05-30-2013 |
20130143707 | SPEED REDUCTION MECHANISM, AND MOTOR TORQUE TRANSMISSION DEVICE INCLUDING THE SAME - In a reduction-transmission mechanism, a plurality of output members are arranged at such positions that a size that is the sum of a fitting clearance formed between an outer periphery of each output member and a corresponding one of needle roller bearings, a fitting clearance formed between the needle roller bearing and an inner periphery of an input member, which defines a corresponding one of a plurality of pin insertion holes, and a radial internal clearance in the needle roller bearing is smaller than a size that is the sum of a fitting clearance formed between a ball bearing and an outer periphery of an eccentric portion, a fitting clearance formed between the ball bearing and an inner periphery of the input member, which defines a center hole, and a radial internal clearance in the ball bearing. | 06-06-2013 |
20130149180 | INTERNAL GEAR PUMP - In an internal gear pump that includes an inner gear having outer teeth and an outer gear having inner teeth, either the inner or outer teeth have a shape based on a tooth shape that is respectively formed by a generating curve of the outer or inner teeth. The inner teeth are arc-shaped, the outer teeth are curved-shaped, and both end sections of the curved shape are arc-shaped. If a radius of the arc shape of the inner teeth is set as ro, a radius of the arc shape of each of the corner sections is set as ri, a diameter of a pitch circle of the inner teeth is set as dp, and the number of the inner teeth is set as z, the inner gear and the outer gear each has a shape that satisfies a relationship established by following equations: 1.6>ro/(dp/z)>1.0; and ro/(dp/z)>ri/(dp/z)≧0.13. Each of the inner teeth is provided so that an intersecting point between one of arcs that follow the first arc shapes of the adjacent inner teeth and the pitch circle of the inner teeth and in proximity to the other arc is located outside of the other arc. | 06-13-2013 |
20130171008 | ELECTRIC PUMP SYSTEM - In an electric pump system, hydraulic fluid that is stored in an oil pan is supplied to a transmission mechanism through an oil passage by driving an oil pump with the use of a motor. An EOPECU estimates a hydraulic pressure of the hydraulic fluid on the basis of a driving current for the motor and a rotation speed of the motor, and executes drive control on the motor on the basis of the estimated hydraulic pressure value. | 07-04-2013 |
20130171010 | MOTOR CONTROL UNIT AND ELECTRIC PUMP UNIT - A control signal output unit obtains a motor control signal by applying a reduction amount for a current command value obtained by an over-power suppression control unit to a current command value from a host control unit. The over-power suppression control unit includes a hydraulic pressure estimation unit that estimates hydraulic pressure, and a current command value correction amount calculation unit that compares a target hydraulic pressure with an estimated hydraulic pressure and outputs the reduction amount for the current command value. Load information indicating whether a load on the pump is a low load or a high load that is higher than the low load is input into a control circuit from the host control unit, and the over-power suppression control unit changes the target hydraulic pressure in accordance with a magnitude of the load indicated by the load information. | 07-04-2013 |
20130178319 | SPEED REDUCTION MECHANISM, AND MOTOR TORQUE TRANSMISSION DEVICE INCLUDING THE SAME - When a bearing includes outer and inner rings and the outer ring is fitted to the inner periphery of an input member, which defines a center hole, with a clearance and the inner ring is fitted to an eccentric portion with a clearance, a size between a second axis and a third axis is set to a size that is smaller than or equal to half of a size obtained by adding a diameter difference between an outside diameter of the bearing and an inside diameter of the input member, which defines the center hole, a diameter difference between an inside diameter of the bearing and an outside diameter of the eccentric portion and an operating clearance of the bearing in a state where the input member has been moved to contact the housing on a line perpendicular to the second axis and a fourth axis. | 07-11-2013 |
20130178322 | SPEED REDUCTION MECHANISM, AND MOTOR TORQUE TRANSMISSION DEVICE INCLUDING THE SAME - When an outer ring is fitted to an inner periphery of an input member, which defines a center hole, and an inner ring is fitted to an eccentric portion with clearances in a reduction-transmission mechanism, in a state where tooth tips of the input member contact bottomlands of a rotation force applying member on a line perpendicular to a second axis and a fourth axis, a size between the second axis and a third axis is set to a size that is smaller than or equal to half of a size obtained by adding a diameter difference between an outside diameter of a ball bearing and an inside diameter of the input member, which defines the center hole, a diameter difference between an inside diameter of the ball bearing and an outside diameter of the eccentric portion and an operating clearance of the ball bearing. | 07-11-2013 |
20130182984 | WHEEL ROLLING BEARING DEVICE - An inner ring member having multiple flange portions is formed by cold forging. A tapered surface is formed in a state of a forged surface on the inner ring member so as to gradually increase in diameter from an inner side toward an outer side in a vehicle lateral direction over a region from a position near root portions of inner side faces of the flange portions in the vehicle lateral direction to a position radially outward of an outer periphery of an outer end portion of an outer ring member in the vehicle lateral direction. A seal member is attached to the outer periphery of the outer end portion of the outer ring member. A seal lip that is in sliding contact with the tapered surface in the state of a forged surface is formed at a distal end portion of the seal member. | 07-18-2013 |
20130182985 | WHEEL ROLLING BEARING DEVICE - A wheel rolling bearing device includes an inner ring member fitted to an axle; an outer ring member having a fixing flange fixed to a vehicle body-side member; and rolling elements rollably arranged between the inner and outer ring members. An encoder and a rotation speed detector are respectively arranged at outer peripheral portions of inner end portions of the inner and outer ring members in the vehicle lateral direction. The rotation speed detector has a fixing portion fixedly arranged in a spatial region between the fixing flange and an outer periphery of the inner end portion of the outer ring member, and a nose portion extending obliquely from the fixing portion toward the encoder and having a detecting portion at its distal end portion. An oblique cutout face is formed in the outer ring member to avoid contact between the outer ring and the nose portion. | 07-18-2013 |
20130184947 | VEHICLE CONTROL UNIT - When a vehicle speed is equal to or higher than a first vehicle speed threshold value or an uphill gradient is lower than a first gradient threshold value and uphill start control is cancelled, if a state where the vehicle speed is lower than a second vehicle speed threshold value and the uphill gradient is equal to or higher than a second gradient threshold value continues for a first set time, uphill start control is executed. When the vehicle speed is decreased after being once increased within a range where the vehicle speed is lower than the first vehicle speed threshold value and uphill start control is cancelled, if a state where the vehicle speed is lower than the second vehicle speed threshold value and the uphill gradient is equal to or higher than the second gradient threshold value continues for a second set time, the uphill start control is executed. | 07-18-2013 |
20130186727 | CLUTCH PLATE AND METHOD OF PRODUCING SAME - A clutch plate in an annular shape, the clutch plate includes: a plurality of lubricating grooves on one end face and the other end face of the clutch plate in an axial direction; and a plurality of windows passing through the clutch plate in the axial direction. The lubricating grooves are formed with plastic deformation, in a same phase on both the end faces, and extended up to outer peripheral edges and inner peripheral edges of both the end faces. A plurality of intersection points where the lubricating grooves intersect with each other are positioned in other areas than at least one of the outer peripheral edges, radially outer edges of the windows, radially inner edges of the windows, and the inner peripheral edges, of both the end faces. | 07-25-2013 |
20130197761 | MOTOR CONTROL DEVICE AND ELECTRIC POWER STEERING DEVICE - A motor control device for driving a brushless motor includes a current detecting unit which detects respective phase currents which flow into the brushless motor; a control calculation unit which calculates instruction values showing respective phase voltages to be applied to the brushless motor, and outputs the instruction values as phase voltage instruction values; a phase resistance calculation unit which calculates respective phase resistance values based on detection values of the respective phase currents detected by the current detecting unit, and the instruction values of the respective phase voltages applied to the brushless motor at the time of the detection of the detection values; a correction unit which corrects the phase voltage instruction values according to the respective phase resistance values calculated by the phase resistance calculation unit; and a driving unit which drives the brushless motor based on the phase voltage instruction values after correction by the correction unit. | 08-01-2013 |
20130199325 | WORM WHEEL - Each tooth of a worm wheel has a first tooth flank in which a helical surface portion is arranged on one side in a rotational axis direction of the worm wheel and a concavely curved surface portion is arranged on the other side in the rotational axis direction, and a second tooth flank in which a concavely curved surface portion is arranged on the one side in the rotational axis direction and the helical surface portion is arranged on the other side in the rotational axis direction. | 08-08-2013 |
Patent application number | Description | Published |
20130074576 | ROAD FRICTION COEFFICIENT ESTIMATING UNIT AND ROAD FRICTION COEFFICIENT ESTIMATING METHOD - A road friction coefficient estimating unit calculates a tire sideslip angle and a cornering force, and estimates a road friction coefficient on the basis of the ratio of the calculated cornering force to the calculated tire sideslip angle. A vehicle travels on multiple road surfaces that differ in road friction coefficient, and tire sideslip angles and cornering forces on the road surfaces are detected in advance. The road friction coefficient estimating unit stores, in a memory, a correlation among the detected tire sideslip angles, the detected cornering forces, and the road friction coefficients in the form of numerical values or a mathematical expression, and estimates a road friction coefficient using the correlation stored in the memory. | 03-28-2013 |
20130076283 | MOTOR CONTROL UNIT AND MOTOR CONTROL UNIT FOR VEHICLE STEERING APPARATUS - A motor control unit controls a motor including a rotor and a stator facing the rotor. A current drive unit drives the motor at an axis current value of a rotating coordinate system that rotates in accordance with a control angle that is a rotational angle used in a control. An addition angle calculation unit calculates an addition angle to be added to the control angle. A control angle calculation unit obtains, at every predetermined calculation cycle, a present value of the control angle by adding the addition angle that is calculated by the addition angle calculation unit to an immediately preceding value of the control angle. A torque detection unit detects a torque that is other than a motor torque and that is applied to a drive target driven by the motor. A command torque setting unit sets a command torque to be applied to the drive target. An addition angle correction unit compares the command torque set by the command torque setting unit with the detected torque detected by the torque detection unit, and corrects the addition angle based on a comparison result. | 03-28-2013 |
20130079992 | POWER STEERING SYSTEM - While drive control of an electric motor is being executed in a normal mode, when a duration of a state where a vehicle speed is lower than or equal to a threshold, a steering angular velocity is lower than or equal to a threshold and a motor current is smaller than or equal to a threshold is longer than or equal to a first predetermined time defined by a threshold, a control mode is changed to a power-saving mode. Thus, a target rotation speed of the electric motor is changed from a first target rotation speed to a second target rotation speed. | 03-28-2013 |
20130079993 | CONTROL UNIT FOR VEHICLE STEERING SYSTEM - A vehicle steering system includes: an electric motor that applies a torque to a steering shaft with the use of field units that differ in number of turns; and a control unit that controls the torque of the electric motor on the basis of a steering torque that is a torque input to the steering shaft in response to an operation of a steering wheel. The control unit controls at least one of motor currents that are supplied to the field units of the electric motor. | 03-28-2013 |
20130081899 | ELECTRIC POWER STEERING SYSTEM - Assist force that assists an operation of a steering system of a vehicle is applied to a rack shaft by transmitting driving force of a motor to the rack shaft via a motor shaft and a ball screw nut. A step is formed on the outer periphery of the ball screw nut. An end portion of a third housing is arranged to face a bearing such that the distance that the ball screw nut is able to move relative to the motor shaft in axial direction and the relative movable length is longer than a predetermined length. | 04-04-2013 |
20130090810 | VEHICLE ATTITUDE CONTROL SYSTEM - A target sideslip angle computing unit calculates a target sideslip angle used when a vehicle makes a turn, based on a steering angle and a vehicle speed. A target sideslip angle correcting unit corrects the target sideslip angle calculated by the target sideslip angle computing unit using a sideslip angle correction amount calculated based on at least one of a steering angular velocity, a depression amount of an accelerator pedal, a depression velocity of the accelerator pedal and a depression amount of a brake pedal. Vehicle attitude control is executed using the target sideslip angle corrected by the target sideslip angle correcting unit. | 04-11-2013 |
20130112492 | HYDRAULIC POWER STEERING SYSTEM - A hydraulic power steering system includes a rotation angle sensor that detects a rotation angle of a shaft. A rotary valve includes a valve element that rotates together with the shaft of an electric motor and a housing that has an internal space connected to oil passages. A control unit reflects an output from the rotation angle sensor on control of the electric motor. | 05-09-2013 |
20130112494 | TORQUE DETECTION DEVICE AND ELECTRIC POWER STEERING SYSTEM - A torque detection device includes: a torsion bar that couples a first shaft to a second shaft such that the first shaft and the second shaft are rotatable relative to each other; an annular magnet that is fixed to the first shaft; a pair of magnetic yokes that are fixed to the second shaft and that are arranged to face the magnet; and Hall ICs. Each of the magnetic yokes has a plurality of lugs arranged at equal intervals in a circumferential direction, and each lug becomes narrower toward its distal end, and has a curved profile with rounded corners when viewed from a radial direction of the corresponding magnetic yoke. | 05-09-2013 |
20130113410 | TORQUE DETECTION DEVICE AND ELECTRIC POWER STEERING SYSTEM - A torque detection device includes: a torsion bar that couples a first shaft to a second shaft; a magnet that is fixed to the first shaft; and a pair of magnetic yokes that are fixed to the second shaft and that are arranged to face each other in an axial direction. Each of the magnetic yokes includes a yoke ring and a plurality of lugs that are arranged in a circumferential direction on the corresponding yoke ring. Each yoke ring includes an extending portion that extends radially outward from base portions of the lugs, and a bent portion that is bent in the axial direction from a radially outer end portion of the extending portion. The outer size of the pair of magnetic yokes in the axial direction is larger than or equal to the length of the magnet in the axial direction. | 05-09-2013 |
20130113471 | ROTATION ANGLE DETECTION DEVICE AND TORQUE SENSOR - A torque sensor computes a steering torque applied to a steering wheel on the basis of a difference between a rotation angle of an input shaft, which is detected using a first resolver, and a rotation angle of a lower shaft, which is detected using a second resolver. A planetary gear mechanism that includes a sun gear that rotates together with the input shaft, a planetary gear that is made of a magnetic material and that revolves around the sun gear and an internal gear that is in mesh with the planetary gear is provided. A rotation angle of the input shaft and a position of the planetary gear are detected on the basis of voltage signals output from the first resolver, and a steering angle of the steering wheel is obtained on the basis of the detected rotation angle and the detected position. | 05-09-2013 |
20130116891 | CONTROL APPARATUS FOR STEERING MECHANISM - In a material handling vehicle such as an electric forklift, a depression amount of an accelerator pedal that provides an instruction on a control amount of a drive motor for driving a drive wheel is detected. When the depression amount of the accelerator pedal is equal to or larger than a predetermined value and a forward-backward switching signal that indicates that a shift lever is operated is received, a drive current for a steered system motor is set to a value smaller than a normal drive current within a predetermined time period that starts upon reception of the forward-backward switching signal. | 05-09-2013 |
20130118289 | VEHICLE STEERING SYSTEM - A vehicle steering system includes a steered shaft, and stoppers which restrict an amount of movement of the steered shaft in an axial direction. The steered shaft has first outer peripheral faces, second outer peripheral faces, and annular stepped portions. Each stepped portion includes a contact portion that faces a corresponding one of the stoppers in the axial direction, a first corner portion that has a concave curved sectional shape and connects the first outer peripheral face to an inner end of the contact portion, and a second corner portion that has a concave curved sectional shape with a larger curvature radius than that of the first corner portion, and connects the first outer peripheral face to the second outer peripheral face, at a position in front of or behind a central axis of the steered shaft. | 05-16-2013 |
20130121755 | BALL JOINT - An annular groove, in which a lower end of a boot is fitted, is formed in an outer periphery of an open end of a housing so as to extend in a circumferential direction of the housing. The annular groove is defined by a cylindrical face, an upper inner wall, and a lower inner wall. By fitting a clip onto a cylindrical portion of the lower end of the boot, the cylindrical portion is pushed against the cylindrical face, and an inner end portion and a folded-back portion are pushed against the upper inner wall and the lower inner wall, respectively. The inner end portion has an annular protrusion that is engaged with the upper inner wall and elastically contracted when the lower end of the boot is fitted in the annular groove. | 05-16-2013 |
20130131927 | FOUR-WHEEL STEERING CONTROL SYSTEM - A four-wheel steering control system includes; a torque sensor that detects a steering torque based on an operation of a steering member; a steering angle sensor that detects a steering angle; a steering assist control unit that calculates an assist force for steering front wheels based on the value detected by the torque sensor; and a steered system control unit that executes steered control on rear wheels based on the value detected by the steering angle sensor or the value detected by the torque sensor. When it is determined that there is a failure in a function of the steering assist control unit, the steered system control unit executes the steered control such that the rear wheels are steered only on the side where the steered angle of the rear wheels is opposite in phase from the steering angle of the steering member. | 05-23-2013 |
20130133974 | ELECTRIC POWER STEERING SYSTEM - There is provided an urging mechanism that elastically urges a second end portion of a worm shaft that is supported so as to be pivotable about a first end portion. The urging mechanism is configured to adjust a backlash between the worm shaft and a worm wheel by elastically urging the second end portion in a perpendicular direction that is perpendicular to a direction in which an inter-axis distance between the worm shaft and the worm wheel increases and decreases, in a state where increases and decreases in the inter-axis distance is prevented. | 05-30-2013 |
20130136633 | ELECTRIC MOTOR AND ELECTRIC UNIT INCLUDING THE SAME - A pump housing, a fixing member and a holding member are assembled in the axis direction of an oil pump to fix a stator and a rotor of a brushless motor. The holding member is made of metal material and has a cylindrical shape that extends from its bottom portion toward one side in the axial direction. The fixing member is a cylindrical metal member. Stepped portions, extending in the circumferential direction, are formed in the outer periphery of the holding member and the inner periphery of the fixing member, and contact each other. The outer periphery of the holding member engages with the inner periphery of the fixing member. The outer periphery of the other end portion of the fixing member is fitted to the inner periphery of a flange portion projecting from the end face of the pump housing, which is adjacent to the brushless motor. | 05-30-2013 |
20130138296 | VEHICLE STEERING SYSTEM - An acceleration sensor is attached to a rack housing. A FFT processing unit converts a signal output from the acceleration sensor, which is a time-domain signal, into a frequency-domain signal. An inverse input vibration component extraction unit extracts a signal, of which the frequency (f) falls within a predetermined range (fL≦f≦fH (fH>fL)) and of which the power density (ρ) falls within a predetermined range (ρL≦ρ≦ρH (ρH>ρL)), from the frequency-domain signal obtained by the FFT processing unit. An IFFT processing unit converts the frequency-domain signal extracted by the inverse input vibration component extraction unit into a time-domain signal (estimated inverse input vibration). | 05-30-2013 |
20130138297 | HYDRAULIC POWER STEERING SYSTEM - A damping control unit sets a damping torque command value that corresponds to a steering angular velocity when a direction of a detected steering torque is a turning direction, a magnitude of the detected steering torque is larger than or equal to a first threshold, a direction of the steering angular velocity is a returning direction and a magnitude of the steering angular velocity is higher than or equal to a second threshold. An addition unit adds the damping torque command value generated by the damping control unit to a basic assist torque command value set by a basic assist torque command value setting unit. | 05-30-2013 |
20130138300 | VEHICLE STEERING SYSTEM - In a vehicle steering system, when a sensor malfunction determination unit detects a malfunction of a rotation angle sensor, the sensor malfunction determination unit changes a control mode from a first control mode to a second control mode. In the second control mode, an actual rotor angle (mechanical angle) (θ | 05-30-2013 |
20130144493 | VEHICLE STEERING SYSTEM - When a partial malfunction is detected, a sensor malfunction determination unit changes a control mode from a first control mode to a second control mode. When the control mode is changed from the first control mode to the second control mode, a steered system motor is rotated in a direction corresponding to a rotation direction of a steering wheel immediately before the partial malfunction occurs in the angle sensor. When the absolute value of a steering angular velocity of the steering wheel exceeds a threshold, it is determined that a driver has operated the steering wheel in a direction opposite to a current steered direction, and the rotation direction of the steered system motor is reversed. | 06-06-2013 |
20130158806 | VEHICLE STEERING SYSTEM - When a vehicle is quickly steered while the vehicle is travelling at an extremely low speed, a load on an in-vehicle power supply is reduced without deteriorating a steering feeling by reducing a motor driving current. A steering speed is compared with a threshold. When the steering speed is lower than the threshold, the process proceeds to step S | 06-20-2013 |
20130160596 | POSITION ADJUSTABLE STEERING DEVICE - When clamped side plates of an upper column bracket (movable bracket) are fastened via clamping side plates of an upper fixed bracket by a fastening shaft in response to a rotating operation of an operating lever, the brackets are locked with each other. A pressing mechanism that includes a pressing member moves in the axial direction of the fastening shaft in accordance with fastening by the fastening shaft, and presses a lower tube (inner tube) through an insertion hole formed in an upper tube (outer tube). The entirety of the axial force of the fastening shaft is used as a retaining force for retaining the posture of a steering column. | 06-27-2013 |
20130160597 | STEERING APPARATUS - A steering apparatus includes: a tilt angle adjustment mechanism; a telescopic mechanism; and a drive mechanism. The drive mechanism includes: a rotating member that is rotated by a motor; a transmission member that is coupled to the tilt angle adjustment mechanism; and a selector mechanism that changes a position of the rotating member. The rotating member has a protrusion that protrudes toward the transmission member, and the transmission member has a recess into which the protrusion is inserted. The selector mechanism inserts the protrusion into the recess by moving the rotating member to a coupling position, and removes the protrusion from the recess by moving the rotating member to a non-coupling position. | 06-27-2013 |
20130161113 | HYDRAULIC POWER STEERING SYSTEM - When an ECU is powered on, an overall control unit determines whether a temperature detected by a temperature sensor is lower than or equal to a predetermined temperature. When it is determined that the detected temperature is lower than or equal to the predetermined temperature, the overall control unit provides a second operation start command for operating a valve driving motor control unit in a rotation direction alternately switching mode, to the valve driving motor control unit. When the valve driving motor control unit receives the second operation start command from the overall control unit, the valve driving motor control unit starts operating in the rotation direction alternately switching mode. | 06-27-2013 |
20130161114 | ELECTRIC POWER STEERING SYSTEM - An electric power steering system includes: an annular elastic member that is made of resin, that is arranged between an inner end face of a housing and an outer ring of a bearing that supports a cylindrical member that rotates coaxially with a rack shaft, and that supports the cylindrical member such that the cylindrical member is movable in the axial direction with respect to the housing; and a supporting member that restricts axial movement of the cylindrical member within a predetermined range, and that restricts radially inward movement of the elastic member. | 06-27-2013 |
20130161116 | STEERING SYSTEM - In a steering system, an operation mechanism that includes an operation member includes: a steering angle sensor that detects a steering angle of the operation member; and a steering direction detection unit that detects a steering direction of the operation member. The steering direction detection unit includes: a threaded shaft that is rotatable in the steering direction of the operation member; a nut that is screwed to the threaded shaft; a nut guide that causes the nut to move in accordance with rotation of the threaded shaft; a stopper that prevents movement of the nut beyond a predetermined position; a proximity detection sensor that detects a fact that the nut is in proximity to the stopper; and a variable axial length mechanism that reduces a clearance between the nut and the stopper in response to occurrence of a malfunction in the steering angle sensor. | 06-27-2013 |
20130161117 | STEERING SYSTEM - A steering system includes: an operation mechanism that includes an operation member used to perform a steering operation; and a steered mechanism that is not mechanically coupled to the operation mechanism, and that steers a wheel based on the steering operation of the operation member. The operation mechanism includes a steering angle sensor that detects a steering angle of the operation member, and steering direction detection unit that detects only a steering direction of the operation member. | 06-27-2013 |
20130161118 | STEERING SYSTEM - A steering system includes: an operation mechanism that includes an operation member; and a steered mechanism that is not mechanically coupled to the operation mechanism and that steers a wheel on the basis of a steering operation of the operation member. The operation mechanism includes a steering angle sensor that detects a steering angle of the operation member and a steering direction detection unit that detects a steering direction of the operation member. The steering direction detection unit includes a threaded shaft that is rotatable in the steering direction of the operation member, a nut that is screwed to the threaded shaft, a nut guide that causes the nut to move in an axial direction of the threaded shaft in accordance with rotation of the threaded shaft, and a force detection sensor that detects a force that the nut guide receives from the nut. | 06-27-2013 |
20130182991 | THRUST ROLLER BEARING AND THRUST ROLLER BEARING APPARATUS - A plurality of cage bars of a cage is configured so as to project inward in the radial direction from an inner periphery of an annular portion and to be apart from each other in the circumferential direction. The radially inner side of each pocket defined by two cage bars adjacent to each other in the circumferential direction and the annular portion is open in the radial direction. A concave portion is formed at a corner of the pocket, which is located at the radially outer side. | 07-18-2013 |
20130192390 | TORQUE DETECTION DEVICE AND ELECTRIC POWER STEERING SYSTEM INCLUDING THE SAME - A torque detection device includes: a magnetic flux collecting unit, and a sensor housing. The magnetic flux collecting unit includes a holder, first and second magnetic flux collecting rings, and a magnetic shield. The holder has upper and lower through-holes. The first and second magnetic flux collecting rings are fitted to an inner periphery of the holder. The magnetic shield is fitted to an outer periphery of the holder so as to cover the through-holes. The sensor housing is formed integrally with the magnetic flux collecting unit by supplying resin onto an outer periphery of the magnetic flux collecting unit. The holder has a resin flow passage in its outer periphery. Resin that is supplied at the time of forming the sensor housing flows into the through-holes through the resin flow passage. | 08-01-2013 |
20130199867 | STEERING APPARATUS AND CONNECTOR - A steering apparatus includes a wire fitting bracket that is fitted to an end portion of a connecting wire for connecting an outer tube to an inner tube and that has a bracket body and a plurality of protrusions. The bracket body is fitted to a steering column-side member with a bolt, and has a bolt insertion hole through which the bolt is passed. The protrusions protrude from the bracket body, and are arranged around an axis of the bolt insertion hole. The protrusions are formed of rotation restricting protrusions that restrict rotation of the wire fitting bracket and an erroneous fitting prevention protrusion that prevents erroneous fitting of the wire fitting bracket. | 08-08-2013 |
20130200686 | WHEEL SUPPORT DEVICE - In a wheel support device, a through-hole is formed so as to pass through a hub spindle in its axial direction, an outer ring shaft portion passed through the through-hole is formed in the outer ring, a first connecting portion of which the inner diameter gradually increases toward an axial outer side is formed in the inner periphery of the hub spindle, which defines the through-hole, a second connecting portion that is arranged radially inward of the first connecting portion and of which the outer diameter gradually increases toward the axial outer side is formed in the outer ring shaft portion so as to correspond to the first connecting portion, and the first connecting portion and the second connection portion have spline teeth that mesh with each other. | 08-08-2013 |
20130202241 | ROLLER BEARING CAGE AND MANUFACTURING METHOD THEREFOR - A roller bearing cage includes ring portions and pillar portions extend in an axial direction to connect the ring portions and disposed along a circumferential direction to define pocket portions. The pillar portion includes a bent portion formed in the vicinity of an axial center of the pillar portion so as to protrude radially inwards of the ring portions. A ring portion thickness is larger than a bent portion thickness; a pillar end portion thickness is larger than the bent portion thickness; and the pillar end portion thickness is equal to the ring, portion thickness or more, where the ring portion thickness is a radial thickness of the ring portion; the bent portion thickness is a radial thickness of the bent portion; and the pillar end portion thickness is a thickness of a portion of the pillar portion connected to the ring portion and in the vicinity thereof. | 08-08-2013 |
20130202464 | ELECTRIC OIL PUMP SYSTEM - A stator is fixedly fastened at its outer periphery by a cylindrical and thin metal collar. One end of the collar is engaged with a pump housing. Multiple metal nuts are embedded in insulators fitted to stator cores through insert molding. The stator of a brushless motor is fixed by screwing bolts passed through the pump housing from a pump plate, to nuts embedded in the insulators. | 08-08-2013 |