摘要:
A second computing section executing a compensation control is provided with a third computing section computing a d-axis correction amount, and a fourth computing section computing a q-axis correction amount. The respective computing sections compute a d-axis correction coefficient and a q-axis correction coefficient corresponding to an rotation angle by referring to a map. The respective computing sections compute the d-axis correction amount and the q-axis correction amount on the basis of an arithmetic expression constituted by a first term obtained by multiplying a correction coefficient relating to an object axis by a q-axis current command value and a second term obtained by multiplying a correction coefficient relating to an auxiliary axis by a d-axis current command value. The second computing section computes a d-axis current command value and a q-axis current command value which do not generate a torque ripple caused by a distortion of an induced voltage waveform, by adding the d-axis correction amount and the q-axis correction amount to the d-axis current command value and the q-axis current command value.
摘要:
A wave gear drive comprises a circular rigid internal gear and a flexible external gear inside the rigid internal gear. A wave generator in the flexible external gear flexes the flexible external gear into an elliptical shape. The cross-section of the flexible external gear perpendicular to the axis at a point in the tooth trace direction of the flexible external gear is set as the main cross-section. The rigid internal gear and flexible external gear are gears with a module m, and the flexible external gear has a number of teeth that is smaller than the number of teeth of the rigid internal gear. The moving route M of a tooth of the flexible external gear with respect to a tooth of the rigid internal gear that accompanies rotation of the wave generator when meshing of the teeth in the main cross-section is approximated by rack meshing. On the entering side of the meshing of the teeth to the major axis of the moving route M, a first similar curve AC is obtained by similarity transformation of a pressure angle α orthogonal to the direction of the moving route M. The first similar curve AC is employed as the basic addendum tooth profile of the rigid internal gear. A second similar curve CB is obtained by rotating the first similar curve AC 180 E about endpoint C, and by a similarity transformation in which the first similar curve AC is multiplied by a ratio of similitude (1-λ)/λ The second similar curve CB is employed as the basic addendum tooth profile of the flexible external gear.
摘要:
An adjusting device for a projector lens comprises a seat bearing a lens, a shaft connected to the seat which moving on the shaft to adjust lens positions when the shaft rotates, a first gear pivoted on the shaft, a second gear engaging the first gear, a motor rotating the second gear, and an torque limiter joined to the first gear and the shaft. The motor rotates the shaft via the first and second gears. When the torque rotating the shaft exceeds a predetermined value, the torque limiter releases the first gear from the shaft enabling the first gear to rotate relative to the shaft to intercept the torque transmitted from the motor to the shaft.
摘要:
In order to achieve low cost, small size, and light weight, to improve response at the time of transmission of power, and to prevent the occurrence of unusual noise, a power transmission device (10) of an electric power steering device (1) has a motor section (5) comprising a rotational shaft (7), a rotor (51) attached to an inner end side (7a) of the rotational shaft (7), and a stator (52) positioned opposite to the rotor (51), a worm gear (61) attached to a distal end side (7b) from the motor section (5) on the rotational shaft (7), and a worm wheel gear (62) engaged with the gear (61). The rotational shaft (7) is rotatably supported by first and second bearings (81, 82), the first bearing (81) being held by a housing (4) at a distal end side (7b) to the worm gear (61). The second bearing (82) is held by the housing (4) between the worm gear (61) and the rotor (51) so that the worm gear (61) is sandwiched between the first and second bearings (81, 82).
摘要:
A power-steering system, e.g., for a motor vehicle, having an electric motor, which transmits a steering-assist force via a belt transmission to a ball-screw transmission for displacing vehicle wheels, includes a cam, via which the ball-screw transmission and/or electric motor is supported in a steering-gear housing. The tension of a belt of the belt transmission is adjustable by rotating the cam in the steering-gear housing. The cam has at least one cutout on the circumference, and/or the steering-gear housing has at least one cutout in its inner wall. A locking element may be inserted into the cutout, in order to fix the cam in position with respect to the steering-gear housing. After being inserted, the locking element is operatively connected to the cam and the steering-gear housing.
摘要:
An infinitely-variable transmission consists of a rotational input member, a rotational output member, first and second non-circular driving gears coupled to one of the rotational members, and a plurality of variable velocity-ratio gear assemblies disposed about the one rotational member. Each gear assembly comprises an intermediate shaft including first and second non-circular driven gears respectively meshing with the first and second non-circular driving gears. Each gear assembly also comprises a multi-directional coupling associated with the pair of first driven/driving gears and the pair of second driven/driving gears, and an actuator associated with the coupling for coupling the first and second variable-ratio gear pairs to the rotational members. Preferably, the variable-ratio gear pairs for each gear assembly are coupled to the rotational members over an angular duration when the velocity ratios of both the variable-ratio gear pairs of the respective gear assembly are changing linearly so as to provide a uniform velocity ratio over that angular duration. Further, preferably the occurrences of these angular durations for each of the gear assemblies overlap or are at least coterminous so as to provide a continuously uniform velocity ratio between the rotational members. The transmission also includes a phase angle variator associated with the variable-ratio gear pairs for varying the rotational angular displacement between the first gear pairs and the second gear pairs of each gear assembly so as to vary the velocity ratio of the transmission as needed.
摘要:
A variable gear ratio device featuring geared segments with variable gear ratio adapted for inclusion into mechanical machines, motors and pumps where there is a constant requirement for a variable transfer ratio for the variability and optimization of the load of torque that are formed by a driving shaft and driven shaft. The device features a plurality of engaged gears capable of eccentric rotation where the axis of rotation of the driven shaft is moved outside of the center axis of the driving eccentric geared segment.
摘要:
A harmonic drive motor includes a first annular member, concentric second and third members, and a device for flexing the first annular member. The first annular member has a longitudinal axis and is flexible. The second member is relatively rigid and is substantially coaxially aligned externally of the first annular member, and the third member is relatively rigid and is substantially coaxially aligned internally of the first annular member. One of the second and third members is rotatable about the longitudinal axis and the other is relatively non-rotatable. The flexing device flexes the first annular member into at least two spaced-apart points of contact with the inner diameter surface of the second member and into at least two spaced-apart points of contact with the outer diameter surface of the third member. The flexing device sequentially flexes the first annular member to rotate both sets of at least two points of contact about the longitudinal axis which effects relative rotation between the second and third members.
摘要:
A power steering system for a vehicle includes a power assist unit composed of a unitized combination of a torque sensor, an electric motor and a power transmission mechanism. The power assist unit is mounted to a cross member provided on the vehicle body side, to enable a reduction in the number of component parts and realization of a compact design. A steering shaft is rotatably supported on only a single support case mounted to a cross member. At least an electric motor of a power assist unit is mounted to the cross member through the support case.
摘要:
A pinion shaft rotated by a steering wheel has a pinion gear formed thereon. A rack bar has at a front surface thereof a toothed rack portion meshed with the pinion gear of the pinion shaft. A rotating member is arranged to support a rear surface of the rack bar while being permitted to rotate when the rack bar moves axially. A biasing mechanism that biases the rotating member toward an actually meshed portion between the toothed rack portion and the pinion gear. A supporting member is arranged to slidably support the rear surface of the rack bar.