Abstract: A power steering device is provided with a device body and a hollow motor. The device body has a steering system in which a piston is disposed on an output shaft via a ball screw mechanism so that a steering (rotational) torque is transmitted from an input shaft to the output shaft and converted to rotation of a sector shaft by axial movement of the piston for steering of steerable wheels. The hollow motor is connected to the outer circumference of the input shaft and driven by energization control based on driving support information from a vehicle-mounted camera and the like. A key and a key groove are provided on the outer circumference of the input shaft and the inner circumference of a rotor of the hollow motor, respectively, so as to constitute a key connection between the input shaft and the hollow motor.

Abstract: Disclosed is a torque sensor unit including a magnetic member fixed to a first output shaft member, a pair of first and second yoke members fixed to an input shaft member and surrounding an outer circumferential side of the magnetic member and a magnetic sensor adapted to detect a magnetic flux passing through between the yoke members. The magnetic member is provided with a sleeve and a permanent magnet. The sleeve is formed of a metal material in a substantially cylindrical shape and has a plurality of radially extending support portions and a plurality of axially extending engagement protrusions between the support portions. The permanent magnet is formed into an annular shape and has a plurality of axially extending engagement grooves cut in an inner circumferential surface thereof. The permanent magnet and the sleeve are coupled via a resin-based filling material.

Abstract: In a power steering device and a control device for a vehicle-mounted instrument, an abnormality detection accuracy of sensor output signals is increased. In an electric power steering device and a control device for a vehicle-mounted instrument, judgment for the abnormality of the sensor output signals is carried out by using at least four or more sensor output signals, in which when the sensor output signals satisfy both a first condition (viz., the number of the output signals showing an identical value is the largest) and a second condition (viz., the number is equal to or larger than “n+1”) (n=the largest number of the sensor output signals that have a common factor), judgement is so made that the sensor output signals that satisfy the first and second conditions are normal and the other signals are abnormal.

Abstract: A power steering system is provided with a communicating hole and yet ensures the strength of a housing. Space between the housing and a wheel turning shaft is divided into two. Space located on one axial side of the bearing supporting a nut and the plurality of balls disposed in the nut is a first chamber, and space located on the other side is a second chamber. The communicating hole allowing communication between the first and second chambers is formed in the nut to open in the nut-side ball screw groove, avoiding a region in which the balls circulate, or in a member disposed radially further outside than the nut and radially inside than the inner wall of the housing.

Abstract: In a power steering device and a vehicle-mounted instrument, an abnormality detection accuracy of a state quantity detection means is increased. In an electric power steering device and a vehicle-mounted instrument that are each provided with a plurality of state quantity detection means, an abnormality detection for the state quantity detection means is carried out by comparing detection signals issued from the state quantity detection means provided on a redundant system, and by comparing the detection signals issued from the state quantity detection means with signals that are issued from other state quantity detecting means and calculated to be matched with the same unit as the compared detection signals, a value or close value that is possessed by the largest number of signals is set as a normal value.

Abstract: A pump apparatus includes: a spool valve including a first land portion, a second land portion, and a third land portion; a first pressure chamber into which an upstream pressure of the metering orifice is introduce; a second pressure chamber into which a downstream pressure of the metering orifice is introduced; a third pressure chamber into which the pressure of the discharge passage is introduced; a fourth pressure chamber into which a low pressure is introduced; and a first fluid pressure chamber side communication passage which is formed in the pump housing which is arranged to selectively supply the pressure of the third pressure chamber and the pressure of the fourth pressure chamber to the first fluid pressure chamber in accordance with the movement of the spool valve.

Abstract: A fixation member is circularly formed to surround a wheel turning shaft and includes an abutment surface in abutment with an end surface of a bearing on one axial side. The fixation member fixes the bearing to a housing by being fixed in the housing with the abutment surface in abutment with the end surface of the bearing. When being mounted, the fixation member is provided by being moved from an opposite axial end side to one axial end side of the nut. The abutment surface of the fixation member is formed on at least a radially inner side of the fixation member. The fixation member includes a cutout portion provided on the radially inner side of the fixation member and formed to prevent interference with a circulation member when the fixation member is inserted in the housing.

Abstract: A nut is formed by a die forging process in which a die used for the die forging process is released in a direction along the direction of the axis of rotation of the nut.

Abstract: In order to suppress an electric power steering device from generating a contact noise due to operation of a mechanical stopper and a rack stopper, there is provided a control unit in which a command signal I0 applied to an electric motor used for assisting the steering power is calculated taking into consideration both a rack stopper side damping correction represented by a rack side damping correction signal Dr calculated in a rack side damping correction amount calculation part 21 and a mechanical stopper side damping correction represented by a mechanical side damping correction signal Dm calculated in a mechanical side damping correction amount calculation part 23.

Abstract: Torque sensor has: magnetic member; first yoke member having (a) first nail portions arranged concentrically to face the magnetic member in radial direction and (b) first ring portion; second yoke member having (c) second nail portions arranged concentrically so that the first and second nail portions are circumferentially alternately arranged and the second nail portions face the magnetic member in radial direction and (d) second ring portion; first magnetic flux concentration ring provided between the first and second ring portions; second magnetic flux concentration ring provided between the second ring portion and the first magnetic flux concentration ring; and magnetic sensor. The first and second magnetic flux concentration rings and the first and second ring portions are arranged in layers in radial direction. A part or all of axial direction area of the first and second magnetic flux concentration rings is surrounded and shielded by the second ring portion.

Abstract: A variable displacement vane pump includes a notch portion which is a flow path provided to extend from an initiating end of a discharge port towards a terminating end side of a suction port. The notch portion is formed so that a sectional area of the flow path is smaller than a sectional area of the discharge port at the initiating end thereof and that a length of the flow path in a circumferential direction is 1.5 pitches or larger. The terminating end of the suction port is a point where the vane in the suction area last overlaps the suction port. The initiating end of the discharge port is a point where the vane departed from the suction area first overlaps the discharge port. One pitch is a distance defied in the circumferential direction between adjacent vanes of the plurality of vanes.

Abstract: After a Hall IC sensor is set in a connector in such a manner that the Hall IC sensor and a harness are electrically connected to each other, the connector and the Hall IC sensor are inserted from an opposite side of a connector insertion hole in a radial direction toward one side of the connection insertion hole in the radial direction, and a first magnetism collection ring and a second magnetism collection ring are inserted into a torque sensor container portion from a first opening portion in such a manner that the Hall IC sensor is situated between the first magnetism collection ring and the second magnetism collection ring in the radial direction.

Abstract: A tank-integrated pump unit includes a reservoir tank fixed to a pump body. The body of the reservoir tank includes an introduction opening for introducing working fluid from an external hydraulic device into the body. A filter member is arranged in the body for filtering working fluid introduced through the introduction opening. A suction passage connection portion is connected to a suction hole of a pump body. The suction passage connection portion includes a body-side opening through a wall of the body. The body-side opening is located below a predetermined level of working fluid and above a lowermost position in the body. A pressure chamber is defined in the body, and located below the body-side opening of the suction passage connection portion. The introduction opening faces the pressure chamber. The filter member covers an upper side of the pressure chamber.

Abstract: A power steering apparatus includes a worm gear that transmits a rotational force of an electric motor to a steering mechanism through engagement of a worm shaft and a worm wheel and a backlash adjustment mechanism that reduces backlash between the worm shaft and the worm wheel. The backlash adjustment mechanism has a ball bearing mounted to the worm shaft, a slider movable in a movement direction substantially perpendicular to a rotation axis of the worm shaft, a first sliding surface provided on an outer circumferential side of an outer race of the ball bearing, and a second sliding surface provided on the slider and brought in sliding contact with the first sliding surface such that forward movement of the slider in the movement direction causes relative sliding of the first and second sliding surfaces to bring the worm shaft closer to the worm wheel.

Abstract: For compensation for loss of a steering assist force due to friction of a steering mechanism, when calculating a friction correction value for the compensation, in an electronic control unit 6, a static friction and a kinetic friction are distinguished, and the calculation is made by combining the static friction correction value Sf and the kinetic friction correction value Kf according to each friction. It is therefore possible to make a proper friction loss compensation according to type of the friction.

Abstract: A welding plate 29 and a yoke holder 23 are welded and fixed to each other having a pair of yokes 21 and 22 put therebetween.

Abstract: A power steering apparatus includes: a steering load average value calculating circuit 39 which calculates a steering torque average value Trav which is the average value of steering torque Tr within a predetermined interval of time; and an abnormality detection circuit 40 which compares steering torque average value Trav with a specified steering torque value Trrf and detects the abnormality of the apparatus when steering torque average value Trav is larger than the specified value.

Abstract: A steering angle sensor for a vehicle including a steering angle sensor housing, a first gear, a rotation transmitting portion, a second gear meshing with the first gear, a third gear meshing with the first gear or the second gear, first and second magnetoresistance effect elements to detect first and second rotation angles as rotation angles of the second and third gears, respectively, and a biasing member disposed in the steering angle sensor housing to bias the first gear toward the second gear, wherein the first and rotation angles are combined to determine an absolute steering angle indicative of an amount of rotation of a steering wheel when the steering wheel is rotated from a neutral position in which a steerable road wheel is oriented to a straight ahead direction of the vehicle.

Abstract: A first valve accommodation hole is provided in a valve housing. A first valve element, a first valve seat member, a first coil spring, and a first pin are directly accommodated and disposed in the first valve accommodation hole. It is thereby possible to reduce the maximum diameter t1 of the first valve accommodation hole, thus reducing the size of a housing main body.

Abstract: The present invention performs pulse shift control in such a manner that a difference between switching timings of PWM duty signals can reach or exceed a second predetermined value when the difference between the switching timings of the PWM duty signals of phases falls below the first predetermined value, and determines a correction amount for the phase by the pulse shift control in such a manner that a correction amount after switching becomes smaller than a correction amount before the switching of a phase on which the pulse shift control is performed in pulse shift phase switching control.