Abstract: An electric power steering apparatus includes motor relative angle detect means 48 including motor relative angle information calculating portions 48a ˜48c for calculating the relative angle information of an electric motor corresponding to a driver's steering amount applied to a steering system and a relative angle information compensating portion 48e for preventing the motor relative angle information calculating portions from being incapable of obtaining the relative angle information to thereby enable to generate the relative angle information all the time. The motor control means controls the electric motor based on arbitrary actual angle without setting an initial angle at the time of driving based on the relative angle information detected by the motor relative angle information detection means. It is restricted to impart uncomfortable feeling on the driver by using simply configured motor rotation angle detection means which prevents from increasing of the number of parts and cost.

Abstract: A magnet portion 27 of a magnetic encoder 26 includes a magnetic member and a resin, and a highly reliable magnetic encoder 26 having a high magnetic property and enabling to detect a rotational number with high accuracy, and a hub unit bearing 2a are provided. Further, the resin is preferably a thermoplastic resin and further preferably includes a thermoplastic resin including a soft segment in a molecule. Further, the magnetic encoder 26 further includes a fixed member 25 attached with the magnet portion 27 and comprising a magnetic material, and the magnet portion 27 and the fixed member 25 are bonded by an adhering agent including at least one of a phenolic resin based and an epoxy resin based.

Abstract: A belt speed reducing apparatus for an electric power steering apparatus includes a drive pulley having a first helical gear, a driven pulley having a second helical gear and a drive belt having a third helical gear in which a relationship of tan ?<? is established between a twist angle ? of the respective helical gears and a friction coefficient ? between the first or the second helical gear and the third helical gear. Further, an electric power steering apparatus for adjusting a backlash between gears of a speed reducing apparatus brought in mesh with each other or adjusting a tension of a belt of a speed reducing apparatus.

Abstract: A ball screw includes a screw shaft 1, a nut 2 screwed to the screw shaft 1 via balls 3 rollably charged to a ball rolling path 5 in a spiral shape, a ball return path 6 for circulating the ball 3 by delivering the ball 3 from an end point to a start point of the ball rolling path 5, and ball guide member 10 for guiding the ball 3 between the ball rolling path 5 and the ball return path 6. The ball guide member 10 is fitted to a recess portion 15 provided at an end face of the nut 2. An outer edge portion 20a of a fixing member 20 is inserted into a groove portion 16 formed at an inner face of the recess portion 15, so that the fixing member 20 fixes the ball guide member 10 to the nut 2.

Abstract: Disclosed herein is a method for controlling an electric power steering system, wherein a motor is controlled by vector control and driven by a current command value calculated on the basis of a parameter such as a steering torque to provide a steering assist power to a vehicle steering system, and further wherein the current command value is limited on the basis of desired output characteristics and a desired angular speed during a field-weakening control and a non-field-weakening control of the vector control.

Abstract: An electric power steering device changes the discontinuous non-linear characteristics in the duty ratio of the PWM signal versus motor current generated during steering wheel handle return into linear characteristics to suppress noise and provides a smooth and natural feeling steering. The electric control circuit (13) provided a current reference value calculator (22A) to calculate Iref, a current controller (22B) to obtain Vref2, a compensation adder (25) to obtain a duty D1, and a current discontinuity compensator (24) in order to obtain a duty D2. A motor drive circuit (35) including an H bridge circuit whose upper stage FET (1) is driven by the duty D1, and whose lower stage FED (3) paired with the upper stage FET (1), is driven by the duty D2 to allow forming a continuous linear characteristic in the duty ratio of the PWM signal versus the motor current.

Abstract: An anomaly diagnosis apparatus for analyzing sound or vibration data produced by a machine installation and diagnosing the presence or absence of an anomaly in a sliding member in the machine installation which is made up of a diagnosis processing server (1) and a user information processing terminal (3) which are connected through a network (2). The diagnosis processing server (1) receives the sound or vibration data produced by the machine installation and information for identifying the sliding member used with the machine installation through the network (2) from the user information processing terminal 3, makes an anomaly diagnosis of the machine installation based on the received data, and transmits the diagnosis result through the network (2) to the user information processing terminal (3), thereby lightening the burden of the user and executing anomaly diagnosis processing promptly.

Abstract: A resin snap cage 4 comprises a resin-made circular main part 10, a plurality of pockets 11 provided in one axial end face of the circular main part 10, and a circular reinforcing member 12 installed concentrically at the other end face in an axial direction of the circular main part 10. While this reinforcing member 12 is circular along the circular main part 10, a sectional shape in a plane parallel to an axial direction is a rectangle. The reinforcing member 12 is embedded in a recessed portion formed at the other end face in an axial direction of the circular main part 10 to be integrated, an outside diameter surface 12a, an inside diameter surface 12b, and a pocket-side surface 12c of the reinforcing member 12 are covered with the circular main part 10, and a surface 12d thereof opposite to the pocket side is exposed.

Abstract: A rotation-support apparatus having construction in which large force is not applied to continuous sections between column sections 12a and rim sections 11 even when needles 6 push in the circumferential direction against the side surfaces in the circumferential direction of the column sections 12a, thus making it possible to improve the durability of a retainer 7a. Of both side surfaces in the circumferential direction of a straight section 15a on the inner-radial side in the middle section in the axial direction of the column sections 12a, the portion near the outer-radial side of the retainer 7a is more recessed than the portion near the inner-radial side of the retainer 7a. Moreover, this portion near the inner-radial side is located within the pitch circle P of the needles 6. Furthermore, there is no contact between the rolling surfaces of the needles 6 and the straight section 15a on the inner-radial side.

Abstract: A trunnion for toroidal continuously variable transmission, includes: an oblique surface, a bottom surface, an inclining shaft having an end surface and an inclining end surface, a pivot hole, an inner flat plane, and a crossing lubrication hole. The trunnion is obtained by supporting a trunnion material taking the oblique surface or the bottom surface as a machining reference and taking one of the end surface and the inclining end surface as an axial positioning reference, and by machining the trunnion material to form the inner flat surface, the pivot hole and the crossing lubrication hole of the trunnion while keeping the trunnion material retained.

Abstract: A linear guide has an under seal which is arranged on an under surface of a slider main body along an axial direction, has an axial end portion held by an end cap, comes in slide contact with a guide rail, and seals the under surface of the slider main body. In the linear guide, the under seal has an elastic lip portion, in a portion of the under seal coming in contact with the slider main body, which has a length approximately equal to an axial length of the slider main body and elastically comes in contact with the slider main body.

Abstract: A linear guide device has a retaining piece (15) between two adjacent rollers (9). The retaining piece (15) has a retaining piece body (16) having left side-face section and a right side-face section that are parallel to the end face sections of the rollers (9), a first arm section (19) extending from the left side-face section of the retaining piece body (16) toward the end face sections of the two adjacent rollers (9) and fitting in a first guide groove (22) formed in one wall surface section of a circulation path (21), and a second arm section (20) provided on the right side-face section of the retaining piece body (16) so as to be parallel to the first arm section (19) and fitting in a second guide groove (23) formed in the other wall surface section of the circulation path (21).

Abstract: With respect to an outer ring 2b in which a diameter DB1 of a first outer ring raceway 10c is greater than a diameter of a second outer ring raceway 10b (DB1>DB2), a method is realized which facilitates the entry of a grinding tool 12 into an inner side of the outer ring when these both outer ring raceways 10c and 10b are subjected to a grinding process. As shown in (A) to (B), the grinding tool 12 is made to enter the inner side of the outer ring 2b through an opening on a side close to the first outer ring raceway 10c between the openings at both ends of this outer ring 2b. This resolves the above-described problem.

Abstract: A method of manufacturing a retainer for a roller bearing made of a metal plate and has a tubular main portion, pockets formed in the main portion intermittently concerning a circumferential direction and capable of retaining rollers rollably, and an outwardly oriented flange-like collar portion. An annular intermediate material is formed by die cutting the metal plate, and after a second intermediate material is formed by forming through holes in the intermediate material intermittently, a portion of the second intermediate material excluding a radially outer end portion is plastically deformed into a tubular shape. The portion plastically deformed tubular shape is formed as the main portion, a portion corresponding to the radially outer end portion of the second intermediate material is formed as the collar portion or a collar portion element for forming the collar portion, and portions corresponding to the through holes are formed as the pockets.

Abstract: A control apparatus of an electric power steering apparatus is provided in which a nonlinear element of a motor model of-the electric power steering apparatus is compensated beforehand to linearize the motor model and the back electromotive force of the motor is computed to compensate the back electromotive force for a control loop, and conduct back electromotive force compensation with no lag in order to realize a control apparatus of an electric power steering apparatus with less control error, stable controllability, small motor output torque ripple, good wheel steering feeling, and less motor noise.

Abstract: The present invention provides a control apparatus for an electric power steering apparatus comprises: a steering assist command value calculating section; a current control section that calculates a voltage command value; and a motor driving section that drives a motor based on the voltage command value, wherein an assist power from the motor is applied to a steering system, the control apparatus is characterized in that an SAT measuring section, that inputs an angular speed and an angular acceleration of the motor, the steering assist command value and the torque signal therein so as to estimate an SAT, is provided, and the SAT obtained by the SAT measuring section is feedbacked to the steering assist command value via a feedback section composed of a phase compensating section and a gain section.

Abstract: To provide an electric power steering apparatus in which ground processing for respective sections requiring a ground can be reduced to necessary minimum to improve assemblability. An electric power steering apparatus includes a steering column 3 having inserted therein a steering shaft 2 to which steering torque is transmitted and an electric motor 5 that transmits a steering assisting force to the steering shaft 2 via a reduction mechanism in a conductive reduction gear box 4. A control unit 19 including boards 23 and 25 mounted with control circuits that control to drive the electric motor is mounted on the reduction gear box 4, a connecting section of the electric motor 5 is electrically connected to the control unit 19 directly, and connection of the reduction gear box 4 and the control unit 19 to a ground is performed via a grounding line 29 disposed between the control unit 19 and a power feeding unit 30.

Abstract: A toroidal-type continuously variable transmission has a pair of input and output disks each including a first traction surface, power rollers each including a second traction surface and respectively interposed between the first traction surfaces of the input and output disks, an oil passage for guiding lubricating oil to the traction surfaces of the power rollers, input disk and output disk, and a mesh filter disposed on the exit side of the associated oil passage.

Abstract: The present invention provides a controller of an electric power steering device which does not apply an uncomfortable feeling to a operation of steering wheel while securing a fault determination confirming period enough long to prevent an erroneous detection of a torque sensor fault, and can secure a safety operation of steering wheel, even in the case that an output value of a torque sensor detecting a steering torque of a steering wheel becomes abnormal.

Abstract: This invention provides a telescopic shaft in which a backlash or a sliding resistance in a rotational direction is maintained to a predetermined value even when there are fabrication errors in a male shaft and a female shaft, and a preload is not reduced even when a sleeve is worn by a friction force in sliding, and a steering apparatus having the telescopic shaft. An inclined sleeve portion 712 is pressed by an elastic deformation of an urge sleeve portion 713, so that there is not backlash between a male shaft 12B and a female shaft 12A and a predetermined preload is applied. Although an outer periphery of the inclined sleeve portion 712 is worn by a friction in sliding, the inclined sleeve portion 712 is further pressed by an elastic force of the urge sleeve portion 713 by an amount of wearing the outer periphery of the inclined sleeve portion 712. Thus, a predetermined urge force is always operated to the inclined sleeve portion 71.