Abstract: In an electric power steering apparatus that urges a steering shaft or a rack shaft with an assist load using the drive force of a motor by a transmission mechanism via reduction gears, the reduction gears includes a rotation angle sensor assembled integrally therewith.

Abstract: The present invention relates to a motor-driven power steering apparatus structured such as to apply a steering assist force generated by a motor to a steering system of a motor vehicle or a vehicle in accordance with a rotation force of an electric motor on the basis of a steering torque detected by a torque sensor. Further, the invention relates to a rotation angle sensor for detecting a rotation angle of a steering shaft, a detected portion of the rotation angle sensor is provided within the speed reduction gear, and a detecting portion of the rotation angle sensor is provided in a radial direction of the steering shaft and in an outer side of a bearing in the speed reduction gear.

Abstract: A manufacturing method for a worm wheel, the worm wheel meshed with an operational worm at usage, has steps of preparing a worm wheel, in which at least a surface layer of a tooth portion is made of synthetic resin, preparing a machining worm, in which pitch of teeth of the machining worm in an axial direction thereof is the same as that of an operational worm, diameters of tip and root portions of the tooth of the machining worm are equal to or more than those of the operational worm and abrasive grains are provided on a surface of the machining worm by means of electro-deposition, disposing the machining worm in a twisting position relative to the worm wheel and rotating the machining worm and the worm wheel with meshing each other so as to machining the tooth portion of the worm wheel.

Abstract: The present invention relates to an electric power steering device provided with a torque sensor for detecting a torque using coil windings arranged in the inside of an electromagnetic yoke. The electric power steering device comprises coil bobbins which are housed in the inside of the electromagnetic yoke; a terminal block which projects a portion of the coil bobbins outwardly; and connection pins which are formed on the terminal block in a projecting manner. Further, the connection pins comprise connection members for connecting the connection pins to a sensor circuit substrate and the connection pins are arranged not to be covered and concealed with the sensor circuit substrate.

Abstract: A subject of the present invention is to provide an electric power steering capable of improving a contact ratio by using an hourglass worm to attain a higher output, and also performing a correction of a misalignment easily by simplifying remarkably a fitting operation of the hourglass worm. A worm gear system causes a hourglass worm 2 driven by an electric motor 4 to mesh with a worm wheel 3 provided to an output shaft 5, and a bearing 7 on the shaft end side, which bears rotatably the hourglass worm 2 is composed of a tapered roller bearing an outer ring of which can be separated. In a fitting operation, an inner ring 7a and rolling elements 7b are fitted into the hourglass worm 2 and also an outer ring 7c is fitted in advance in a gear housing 1. Then, the tapered roller bearing 7 is assembled in the gear housing 1 by moving the hourglass worm 2 obliquely to a rotating shaft line of the hourglass worm 2 in the gear housing 1 along a raceway of the outer ring 7c.

Abstract: An electric power steering device having a speed reduction gear using a toothed belt and capable of preventing the speed reduction gear from being locked and steering from being disabled even if the toothed belt is broken. A clearance ? between the inner surface (21x) of the second housing (21b) of the speed reduction gear (40) and the rear surface (29a) of the toothed belt (29) applied to a toothed pulley (27) is formed larger than the tooth depth (H) of the toothed belt (29) (?>II). Thus, even if the toothed belt (29) is broken, the toothed belt (29) is not caught between the inner surface (21x) of the second housing (21b) and the outer peripheral surface (27a) of the second toothed pulley (27), and the toothed pulley (29) is not locked.

Abstract: Due to the meshing of the gears, the following force works on the rack. A separating force (F?) determined by a pressure angle of gears, a lateral force (F?) determined by an angle of torsion of the rack, and drag (Fr) for offsetting angular moment occurring in the rack due to the lateral force (F?). A resultant (F) of the force works from the rack on the rack guide. When the line of this resultant (F) is held on the “inner side” of the end portions of the needle bearing 25 in this rolling type rack guide 21, the rotation of the roller 22 becomes stable.

Abstract: A variable steering gear mechanism (9) is constructed of an external gear (15) connected to an input shaft (11), an internal gear (16) fixed to housing (10) and meshing with the external gear (15), an intermediate member (19) receiving a rotary force transmitted from the external gear (15), change means (18a, 31, 33a) capable of changing a rotation ratio of the output shaft (33) to a rotation of a guide member (18), and an Oldham coupling (17) connecting the intermediate member (19) to the guide member (18). When a speed reduction ratio thereof is set to, e.g., 6:1, it follows that the input member (18) of the change means makes a ¼ rotation (rotates through 90 degrees) during one-sided 1.5 rotations (540 degrees) of the input shaft (11), whereby a characteristic of the change means can be effectively utilized.

Abstract: The present invention provides a motor-driven power steering apparatus structured such that the motor-driven power steering apparatus is provided with a coil bobbin capable of being connected to a sensor circuit board via two connection pins held in an inner portion of a holding portion formed by an electromagnetic yoke and a yoke cover and provided in a terminal table of a side surface upper end portion in a rising manner, a torque sensor formed by facing at least the coil bobbin and the coil bobbin having the same structure to each other is attached and held within a sensor housing, and a steering torque generated on the basis of a steering wheel operation is detected by the torque sensor, in which a regulating means for regulating a phase difference of each of the connection pins toward a peripheral direction is provided in the facing surface side of each of the terminal tables.

Abstract: A torsion coil spring 30 applies an elastic force to a worm shaft 29 in a direction towards a worm wheel, via a pre-load pad 70. The pre-load pad 70 restricts displacement in relation to the widthwise direction, by one side face portion of a holder 61 fixed to a gear housing 22. Due to the elastic deformation of the pre-load pad 70 itself based on the elastic force of the torsion coil spring 30, the side face of the pre-load pad 70 is abutted against the one side face portion of the holder 61, so that a gap between the pre-load pad 70 and the one side face portion is minimized. As a result, the occurrence of a teeth fitting noise in the worm reduction gear 16 is suppressed.

Abstract: A steering device comprises an upper steering shaft, a lower steering shaft for transmitting rotations of the upper steering shaft to a steering gear, an engaging projection provided on a fitted-in portion of the upper shaft, an engaging groove provided on a fitted-in portion of the lower shaft for engaging with the engaging projection with a clearance of a rotational direction and a rotational direction biasing member, provided on the fitted-in portion, for giving a biasing force of a rotational direction between the upper and lower steering shafts.

Abstract: A steering control apparatus in which a steering shaft coupled to a steering wheel is mechanically separated from a turning mechanism to turn a turning wheel, a steering angle of the steering wheel is detected, and the turning mechanism turns the turning wheel by a turning angle corresponding to the steering angle, includes a hypercycloidal mechanism including an external tooth gear revolving in a housing according to rotation of the steering wheel, an Oldham coupling mechanism to extract only a self-rotating movement in a rotation movement of the external tooth gear as a self-rotating movement of a rotation disk, and a rotation regulating mechanism by engagement between a groove formed in the rotation disk and a projection projecting from the housing.

Abstract: A friction roller type transmission includes a first roller (1) and a second roller (2) disposed on two shafts spaced in parallel away from each other so that the first roller (1) and the second roller (2), with the respective shafts being centered, do not contact each other, and a third roller (3) and a fourth roller (4) each of which contacts both of the first roller (1) and the second roller (2), and disposed between the first roller (1) and the second roller (2) and on the sides opposite to a line connecting a center of the first roller (1) and a center of the second roller (2), wherein an angle which is made by a tangential line between the first roller (1) and the third roller (3) (or the fourth roller (4)) and a tangential line between the second roller (2) and the third roller (3) (or the fourth roller (4)) is set not to exceed two times a frictional angle obtained from a coefficient of friction between the respective rollers, and a set load is applied to holding members (20a, 20b) for rotatably holdi

Abstract: An electric power steering apparatus comprises a steering shaft including an input shaft connected to a steering wheel, an output shaft connected to a steering gear device, a torsion bar for transferring torque to the output shaft from the input shaft, the steering shaft being rotatably supported in a steering column, torque detection coils disposed outwards along an outer periphery of the steering shaft, and a worm wheel meshing with a worm rotationally driven by a motor driven corresponding to detected torque and fixed to the output shaft in terms of its rotation, wherein the steering shaft is rotatably supported via a bearing provided between the worm wheel and a column-sided member on the front side of the vehicle.

Abstract: The present invention relates to a motor-driven power steering apparatus structured such as to apply a steering assist force generated by a motor to a steering system of a motor vehicle or a vehicle in accordance with a rotation force of an electric motor on the basis of a steering torque detected by a torque sensor. Further, the invention relates to a rotation angle sensor for detecting a rotation angle of a steering shaft, a detected portion of the rotation angle sensor is provided within the speed reduction gear, and a detecting portion of the rotation angle sensor is provided in a radial direction of the steering shaft and in an outer side of a bearing in the speed reduction gear.

Abstract: In an electric power steering apparatus that urges a steering shaft or a rack shaft with an assist load using the drive force of a motor by a transmission mechanism via reduction gears, the reduction gears includes a rotation angle sensor assembled integrally therewith.

Abstract: An electric power steering apparatus is constructed such that a rotational output of a drive source is, as an auxiliary steering torque, decelerated by a worm gear speed reducer and thus transmitted to a steering shaft so as to assist a steering force applied to a steering wheel, and travelling wheels are thereby steered, wherein the electric power steering apparatus includes cooling means for cooling an interior of a gear chamber of the worm gear speed reducer by circulating the air within the gear chamber thereof.

Abstract: To provide an electrically driven power steering apparatus with a simple structure, which can prevent overloading of an electrical motor and a power transmission system, an absorbing member (121) is attached to a rack shaft (112), and is brought into contact with a rack housing face at a stroke end of the rack shaft (112). The absorbing member (121) at least partially has a material having a Young's modulus of 100 to 900 Mpa, and thus it is possible to effectively relieve an impact at the stroke end.

Abstract: An electric power steering device having a torque sensor for detecting torque by using a coil provided in an electromagnetic yoke. A terminal block projects to the radial outside and axial outside with respect to an axial line of a substantially cylindrical coil bobbin accommodated in the electromagnetic yoke by a predetermined offset amount and is provided in the coil bobbin. The terminal block has press-fitting holes for press-fitting and fixing connection pins for connecting the coil winding and a sensor circuit substrate, wherein the press-fitting holes have air-purging holes communicating with the outside.

Abstract: In a rack assist type electric power steering apparatus which is provided with a ball screw mechanism having a rack shaft and a ball nut, the ball screw mechanism supporting the rack shaft in such a way that the rack shaft can be moved in the axial direction by rotation of the ball nut, a drive pulley rotating integrally with the shaft of an electric motor for power aid, a driven pulley rotating integrally with said ball nut and a belt looped around the drive pulley and the driven pulley, adjustment of the tension of the belt can be effected appropriately and easily.