Abstract: A sun shaft, planetary shafts, and a ring shaft having respective axes of rotation in parallel with one another are provided. A helical sun gear, helical planetary gears, and a helical ring gear are provided on the sun shaft, the planetary shafts, and the ring shaft, respectively, and cooperatively constitute a first planetary gear mechanism. A screw sun gear, screw planetary gears, and a screw ring gear 44 are provided on the sun shaft, the planetary shafts, and the ring shaft, respectively, and cooperatively constitute a second planetary gear mechanism. Either of the gear ratio of the screw sun gear to the screw planetary gears and the gear ratio of the screw ring gear to the screw planetary gears differs from the gear ratio of the helical sun gear to the helical planetary gears and from the gear ratio of the helical ring gear to the helical planetary gears.

Abstract: A planetary gear device having a novel planetary gear mechanism, the device being capable of solving problems of conventional devices. A planetary gear coaxially integrally has at least two, first and second gears (B, E) having different numbers of teeth. One of sun outer gears or sun inner gears having two fundamental axes has at least two, third and fourth gears (C, F) capable of respectively meshing with the first and second gears (B, E) of the planetary gear and of rotating relative to each other. The ratio of the numbers of the teeth of the first gear (B) and the third gear (C) is different from the ratio of the numbers of the teeth of the second gear (E) and the fourth gear (F). The other of sun outer gears or sun inner gears having one fundamental shaft coaxially integrally has at least two, fifth and sixth gears (A, D) respectively meshing with the first and second gears (B, E).

Abstract: To construct an electric power steering device in which the assist power decreases only the torque required for rotating the steering wheel, while the control of the steering angle of the steered wheels follows basically the rotation of the steering wheel by the driver, except when the steering angle of the steered wheels is changed by an actuation of a vehicle behavior control device, by a tie rod connecting bar supported to make a linear motion, a rotary member rotatable around the tie rod connecting bar, a rotation conversion device for converting a rotation of a steering shaft to a rotation of the rotary member, a rotation/linear motion conversion device for converting a rotation of the rotary member to a linear motion of the tie rod connecting bar, and a power assist electric motor to give a rotational force to the rotary member.

Abstract: A gear mechanism having extremely less backlash, capable of suppressing the rattling noise of gears, having a large loading resistance in the thrust direction, and capable of transmitting high torque by using the gears transmitting a force by the meshing of the gears with each other in place of the transmission of the force by friction. The gear mechanism is formed by disposing the plurality of spur gears in the meshed state with each other. The screw-like gears (2) and (4) are disposed on the same axis as the spur gears (1) and (3) in the meshed state with each other. The screw-like gears (2) and (4) adjacent to each other are formed in screw shapes having lead angles extending in the reverse directions to each other and equal in angle to each other. The spur gear (1) and the screw-like gear (2) are rotated integrally with each other to transmit its rotation to the spur gear (3) and the screw-like gear (4) adjacent to each other.

Abstract: An object of the present invention is to perform motion conversion between a rotary motion and a linear motion accurately, stably, and efficiently with a relatively simple structure through combination of aplanetary gear mechanism of helical gears and a planetary gear mechanism of screw gears. A sun shaft 14, planetary shafts 20, and a ring shaft 16 having respective axes of rotation in parallel with one another are provided. A helical sun gear 22, helical planetary gears 28, and a helical ring gear 42 are provided on the sun shaft 14, the planetary shafts 20, and the ring shaft 16, respectively, and cooperatively constitute a first planetary gear mechanism. A screw sun gear 26, screw planetary gears 30, and a screw ring gear 44 are provided on the sun shaft 14, the planetary shafts 20, and the ring shaft 16, respectively, and cooperatively constitute a second planetary gear mechanism.

Abstract: To construct an electric power steering device in which the assist power decreases only the torque required for rotating the steering wheel, while the control of the steering angle of the steered wheels follows basically the rotation of the steering wheel by the driver, except when the steering angle of the steered wheels is changed by an actuation of a vehicle behavior control device, by a tie rod connecting bar supported to make a linear motion, a rotary member rotatable around the tie rod connecting bar, a rotation conversion device for converting a rotation of a steering shaft to a rotation of the rotary member, a rotation/linear motion conversion device for converting a rotation of the rotary member to a linear motion of the tie rod connecting bar, and a power assist electric motor to give a rotational force to the rotary member.

Abstract: A gear mechanism having extremely less backlash, capable of suppressing the rattling noise of gears, having a large loading resistance in the thrust direction, and capable of transmitting high torque by using the gears transmitting a force by the meshing of the gears with each other in place of the transmission of the force by friction. The gear mechanism is formed by disposing the plurality of spur gears in the meshed state with each other. The screw-like gears (2) and (4) are disposed on the same axis as the spur gears (1) and (3) in the meshed state with each other. The screw-like gears (2) and (4) adjacent to each other are formed in screw shapes having lead angles extending in the reverse directions to each other and equal in angle to each other. The spur gear (1) and the screw-like gear (2) are rotated integrally with each other to transmit its rotation to the spur gear (3) and the screw-like gear (4) adjacent to each other.

Abstract: The object of the present invention is to convert a rotary motion into a linear motion more precisely than ever by utilizing the principles of a planetary gear mechanism and a differential screw.

Abstract: The present invention permits the status of reverse running of a vehicle to be detected accurately, because whether the vehicle is in reverse running or not is determined based on a relation between a direction of lateral acceleration and a direction of yaw rate.

Abstract: A steering control apparatus of the present invention has an actuator interposed in a steering system between a steering wheel and road wheels, for exerting a driving force on the steering system, and a phase control for controlling the phase of a steering reaction force acting on the steering wheel through the steering system, and can thus control a hysteresis width in a steering-wheel angle versus steering reaction force characteristic, whereby the hysteresis width can be set arbitrarily and changed suitably.

Abstract: The present invention permits the status of reverse running of a vehicle to be detected accurately, because whether the vehicle is in reverse running or not is determined based on a relation between a direction of lateral acceleration and a direction of yaw rate.

Abstract: A steering control apparatus of the present invention comprises: a steering shaft on which a steering effort is exerted through a steering wheel; a steering angle detecting device for detecting a steering angle which is an angle of rotation of the steering shaft; a steering shaft driving device for rotating the steering shaft; a steering effort detecting device for detecting the steering effort exerted on the steering shaft through the steering wheel; a turning device for turning a steered wheel, based on the steering angle, the turning device being mechanically separated from the steering shaft; a turning reaction force detecting device for detecting a turning reaction force exerted on the steered wheel; and a turning amount detecting device for detecting a turning amount of the steered wheel; wherein the steering shaft driving device drives the steering shaft, taking account of the steering effort, the turning reaction force, the steering angle, and the turning amount.

Abstract: A magnetic rotation detector is composed of a rotary element alternately magnetized with north and south magnetic poles in a circumferential direction and arranged to rotatable about a rotational axis, a magnetoresistance element arranged to be opposed to the magnetized portion of the rotary element, the magnetoresistance element including a linearly patterned superlattice composed of alternately layered magnetic and nonmagnetic metals, and a signal processing circuit placed in a remote position apart from the magnetoresistance element and connected to a pair of terminals of the superlattice to produce a series of pulse signals based on variation of the resistance value of the superlattice caused by change of intensity of a field of the rotary element.

Abstract: To suppress dispersion of detection sensitivity due to a change in ambient temperature in a vibration type angular velocity detecting apparatus.

Abstract: In a three-dimensional coordinate space of X, Y, and Z, there are provided a vibrator having a vibrator base extending in the X-direction on the XY plane, a first vibrating bar projecting in the positive Y direction from the vibrator base and having a first natural frequency in the X-directions, and a second vibrating bar projecting in the negative Y direction from the vibrator base and having a second natural frequency in the X-directions, different from the first natural frequency; excitation means for exciting either the first or second vibrating bar in the Z-directions or in the X-directions; detection means for detecting the amplitude of vibration orthogonal to the Y-directions and to the directions of excitation of vibration caused in the first or second vibrating bar by the excitation means; and angular velocity calculating means for calculating an angular velocity of rotation about an axis in the Y-direction from the magnitude of the amplitude detected by the detection means, and the geometric dimensi

Abstract: In a torque measuring device having a shaft member bearing circumferentially circulating magnetic fluxes along its outer circumferential surface and adapted to measure a torque applied to the shaft member around its central axis by measuring a distortion of the magnetic fluxes caused by the torque according to an inverse magnetostriction, the shaft member has a principal cylindrical portion axially terminating in an annular end face perpendicular to the central axis, whereby a high density of magnetic fluxes corresponding to the axial length of the principal portion are generated to traverse the annular end face, so as to be detected by a magnetic field sensor to produce an output signal at a high S/N ratio.

Abstract: An anomaly discriminating apparatus of the present invention comprises: first and second detecting devices for detecting state values of one event; and a processing device storing occurrence probability distribution group data which is a set of occurrence probability distributions of state values probably detected by the second detecting device against an arbitrary state value detected by the first detecting device, the processing device reading an occurrence probability on an occurrence probability distribution determined by a first state value detected by the first detecting device and a second state value detected by the second detecting device, the processing device determining whether at least either one of the first and second detecting devices is anomalous, based on a plurality of occurrence probabilities read out at different timings.

Abstract: A steering control apparatus of the present invention comprises: a steering shaft on which a steering effort is exerted through a steering wheel; a steering angle detecting device for detecting an angle of rotation of the steering shaft; a turning device for turning a steered wheel, the turning device being mechanically separated from the steering shaft; a target control amount calculating device for calculating a target control amount as a target of turning control, based on a detection result of the steering angle detecting device; a turning control device for outputting a turning control signal according to the target control amount to the turning device and controlling drive of the turning device so that a turning amount of the steered wheel becomes the target control amount; and a correction device for correcting the turning control signal outputted, based on a running status of a vehicle.

Abstract: Since etching of a crotch portion of quartz vibrator defined by segment 18, first segment 13, and second segment 17 advances in accordance with the crystal orientations of quartz, the shape of side surfaces of two quartz vibrating bars opposite to each other with this crotch portion in between can be made symmetric, whereby stress applied on the two quartz vibrating bars can be equalized.

Abstract: A detecting apparatus which detects a quantity of various kinds of vehicle motion without using materials arranged on a road surface. The detecting apparatus is provided on a vehicle. A marking mechanism provides a mark on a road surface, the marking mechanism provided on the vehicle. An imaging device takes images of the road surface including the mark at a predetermined time interval. A quantity of vehicle motion is calculated by detecting a change in a position of the mark during the predetermined time interval based on a plurality of the images.