Abstract: A steering control apparatus includes a rack shaft connected to steerable wheels and having rack teeth in a given axial range, a first steering mechanism having a reduction gear and a first electric motor to apply a drive force to the rack shaft through the reduction gear, a second steering mechanism having a second electric motor, a power cylinder equipped with hydraulic pressure chambers, an oil pump driven by the second electric motor to provide a supply of hydraulic oil to the hydraulic pressure chambers such that the power cylinder applies a driving force to the rack shaft in accordance with a pressure difference between the hydraulic pressure chambers and a switching unit capable of selectively switching the supply of hydraulic oil from the oil pump to the hydraulic pressure chambers, and a control device that controls the first and second electric motors in response to a driver's steering operation.

Abstract: An electric power steering apparatus including: a power system board which is received in a housing, which supports a component of a power supply circuit to supply power to a motor; a control system board which is received in the housing, which supports a component of a control circuit to control the motor, and which extends radially with respect to an axis of the motor output shaft; a rotation sensor which is provided in the housing, which is located, in an axial direction of a motor output shaft, between the motor and the control system board, and which is arranged to sense a rotational position of the motor output shaft; and an output terminal which is provided with the rotation sensor, which is connected electrically with the control system board to supply a rotational position signal of the rotation sensor to the control circuit.

Abstract: A motor control apparatus includes a motor, and a control system board supporting a control circuit to control the motor. The apparatus may further include a power system board supporting a power supply circuit to supply power to the motor. The control system board includes a first board portion facing in a direction along a rotation axis of the motor, and a second board portion extending radially from the first board portion.

Abstract: [PROBLEMS] The object of the invention to provide a power steering system capable of ensuring a sufficient accuracy of meshed-engagement between toothed portions of a worm gear without complicated machining to be made to an inside of a housing.

Abstract: A worm gear includes a worm shaft including a thread including a tooth flank that defines a concave edge in a tooth profile of the thread; and a worm wheel including a tooth including a tooth flank that defines a convex edge in a tooth profile of the tooth. The worm wheel meshes with the worm shaft in such a manner that the tooth flank of the worm wheel and the tooth flank of the worm shaft, as working flanks, define therebetween an entrance-side clearance as a clearance where the thread of the worm shaft starts to mesh with the tooth of the worm wheel, and an exit-side clearance as a clearance where the meshing terminates, wherein the exit-side clearance is smaller than the entrance-side clearance.

Abstract: A steering apparatus includes an axle housing rotatably supporting a wheel hub on which a steered road wheel is installed, and a lower suspension-system control arm adapted to be oscillatingly supported at one end on a vehicle body and having a turning portion provided at the other end for pivotably supporting the axle housing by the turning portion. An electric motor is installed on the lower arm for turning the axle housing by a driving force produced by the motor. A rotation axis of the motor and a pivot of the axle housing are arranged to be offset from each other.

Abstract: A motor drive apparatus includes a motor unit including an output shaft and a first terminal connecting portion; a control board including a second terminal connecting portion, and configured to control a current supply to the motor unit; a housing; a shaft supporting portion supporting the output shaft; and a plurality of relay terminals electrically connecting the first terminal connecting portion with the second terminal connecting portion. The housing includes a motor-unit receiving portion receiving the motor unit, and a board receiving portion formed integrally with the motor-unit receiving portion. The motor-unit receiving portion is formed with an opening on one side of the motor-unit receiving portion in an axial direction of the motor unit and includes a wall portion on another side of the motor-unit receiving portion in the axial direction. The wall portion is formed with a through-hole. The board receiving portion is formed with an opening in the axial direction to receive the control board.

Abstract: By finding a range of an allowable error of maximum meshing position of a worm shaft in an axial direction relative to a worm wheel, that is higher than that of a worm shaft of a conventional worm gear unit, a worm gear unit of the present invention is provided.

Abstract: An electric power steering system, includes a torque sensor disposed to a steering shaft to detect a steering torque. A first pinion is disposed to the steering shaft. A rack shaft is in mesh with the first pinion and connected with the steering shaft to change a rotational motion of the steering shaft to an axial motion of the rack shaft and provided to be operated in relation to the steering shaft. A first motor is connected with the first pinion to generate a steering assist torque in accordance with the steering torque detected by the torque sensor. A second pinion is disposed to be separate from the first pinion and in mesh with the rack shaft. A second motor is connected with the second pinion to generate a steering assist torque in accordance with the steering torque. A first control circuit is provided on a first control board for the first motor. A second control circuit is provided on the second control board for the second motor.

Abstract: 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.

Abstract: A motor control apparatus includes a motor, and a control system board supporting a control circuit to control the motor. The apparatus may further include a power system board supporting a power supply circuit to supply power to the motor. The control system board includes a first board portion facing in a direction along a rotation axis of the motor, and a second board portion extending radially from the first board portion.

Abstract: An electric power steering system for an automotive vehicle, includes a torque sensor disposed to a steering shaft to detect a steering torque. A first pinion is disposed to the steering shaft. A rack shaft is in mesh with the first pinion and connected with the steering shaft to change a rotational motion of the steering shaft to an axial motion of the rack shaft and provided to be operated in relation to the steering shaft. A first motor is connected with the first pinion to generate a steering assist torque in accordance with the steering torque detected by the torque sensor. A second pinion is disposed to be separate from the first pinion and in mesh with the rack shaft. A second motor is connected with the second pinion to generate a steering assist torque in accordance with the steering torque.

Abstract: A worm wheel is mounted to a steered shaft to rotate therewith. A brushless electric motor has an output shaft and is able to generate a power for assisting turning of the steered shaft when energized. A worm gear is coaxially connected to the output shaft of the motor to constitute a combined shaft structure. The worm gear is meshed with the worm wheel. Two bearings bear axially opposite end portions of the combined shaft structure respectively.

Abstract: A variable gear-ratio mechanism includes a rotary element for connecting input and output shafts and having rotation and revolution components. The rotation component is formed with an axial through hole. The input and output shafts are engaged to be rotatable relatively, and the input or output shaft is arranged through the axial through hole.

Abstract: A steering control system for controlling turning of steered road wheels of a motor vehicle in accordance with steering of a steering wheel, comprises a steering angle sensor that detects a steering angle by which the steering wheel is turned; an actuator that turns the steered road wheels when operated; a vehicle operation condition sensor that detects an operation condition of the motor vehicle; a target value determining section that determines a steered angle target value of the steered road wheels in accordance with the steering angle detected by the steering angle sensor and the vehicle operation condition detected by the vehicle operation condition sensor; and an actuator drive circuit that drives the actuator in accordance with the steered angle target value.

Abstract: In vehicular suspension rigidity controlling apparatus and method, a plurality of suspensions intervened between a sprung mass of a vehicle body and an unsprung mass of a corresponding road wheel, a suspension rigidity adjusting section is installed to be enabled to adjust a rigidity of each suspension, a driving state of the vehicle is detected, a predictive determination is made whether the vehicular driving state is a state in which there is a possibility that the vehicle is rolled over from the detected driving state of the vehicle, and the rigidity of at least one of the suspensions is controllably adjusted in a direction to decrease a potential energy of the sprung mass of the vehicle when predictively determining that the vehicular driving state is the state that there is the possibility that the vehicle is rolled over.

Abstract: In vehicular suspension rigidity controlling apparatus and method, a plurality of suspensions intervened between a sprung mass of a vehicle body and an unsprung mass of a corresponding road wheel, a suspension rigidity adjusting section is installed to be enabled to adjust a rigidity of each suspension, a driving state of the vehicle is detected, a predictive determination is made whether the vehicular driving state is a state in which there is a possibility that the vehicle is rolled over from the detected driving state of the vehicle, and the rigidity of at least one of the suspensions is controllably adjusted in a direction to decrease a potential energy of the sprung mass of the vehicle when predictively determining that the vehicular driving state is the state that there is the possibility that the vehicle is rolled over.

Abstract: A fixing bracket for a pressurized fluid buffer device such as a shock absorber or the like is formed as a single piece U-shaped bracket having a circular body portion for surrounding an outer cylinder of the shock absorber and opposed mounting flange portions for attachment to a vehicular chassis. At a location axially outward of the location of bolt holes for attaching the fixing bracket, opposes pairs of projected tooth portions are provided oriented toward each other to contact an exposed portion of the outer cylinder. According to this structure, during vehicle bouncing, for examples the tooth portions are urged to wedge, or bite into the outer cylinder for counteracting forces in a separation direction of the flange portions. Thus, strength is improved while installation processing is reduced. Further, according to this arrangement both manufacturing and installation costs may be significantly reduced while structural features and design flexibility are improved.