NSK Ltd.

Fujisawa, Japan
Fujisawa, Japan

Time filter

Source Type

[Problem] An object of the present invention is to provide a motor having a configuration that includes plural openings which are disposed in a circumferential direction on a case bottom surface and are pulled-out bus bar terminals, and is directly connected between a control board and bus bars by using a simple procedure, and to an electric power steering apparatus and a vehicle equipped with the motor. [Means for solving the problem] The present invention is a motor that an outer periphery is enclosed in a case and wirings are implemented at an anti-load side, comprising: a configuration that includes plural openings which are provided in a circumferential direction on a case bottom surface at the anti-load side and allow bus bar terminals to protrude therefrom, and openings which have an almost same shape of the plural openings and are disposed at a predetermined interval in a similar shape are added as needed.


Patent
NSK Ltd. | Date: 2017-05-03

[Problem] An object of the present invention is to provide a safe electric power steering apparatus with a good steering feeling that includes a function for getting out from restraint of a lateral flow or a one-sided flow, and enables acquisition of a better effect that a drivers load is reduced in the lateral flow or the one-sided flow. [Means for solving the problem] A motor current correction value calculating section that corrects a current command value by a motor current correction value based on a motor correction signal comprises a straight running state judging section that judges a straight running state of a vehicle, an adaptive calculating section that calculates and outputs the motor correction signal according to a straight running judgment result of the straight running state judging section, a steering angle and an action force, a vehicle speed sensitive gain section that outputs a vehicle speed gain corresponding to a vehicle speed, and an output calculating section that multiplies the motor correction signal by the vehicle speed gain and outputs the motor current correction value, and includes a function for getting out from restraint of a lateral flow or a one-sided flow by storing a steering angle at the time when the motor correction signal exceeds a threshold while judging straight running, setting new upper and lower thresholds for its stored value, and performing judgment based on comparison between the motor correction signal and the thresholds.


Patent
NSK Ltd. | Date: 2017-05-03

A steering apparatus (2) is disclosed, which includes: a steering shaft (3) having a conductive property and transferring a steering force; an outer column (10) having a conductive property and supporting the steering shaft (3) rotatably; an inner column (11) having a conductive property, being fitted in the outer column (10) to enable a relative movement in an axial direction supporting the steering shaft (3) rotatably together with the outer column (10); a bracket (12) having a conductive property, retaining the outer column (10) and being fixed to a vehicle body; and an electrifying lead (17) having a conductive property and configuring a part of an electrifying path leading to the vehicle body from the inner column (11).


Patent
NSK Ltd. | Date: 2017-05-03

A steering device includes an inner column, an outer column, an outer column bracket, an inner column bracket, a shear pin, and a damper. A first hole is formed in the inner column. The outer column has a slit formed by notching one end. The outer column bracket tightens the outer column together with a telescopic friction plate. The inner column bracket is supported by the telescopic friction plate, and has a second hole. The shear pin detachably connects the inner column and the inner column bracket to each other at a position across the first hole and the second hole. The damper faces an internal end portion wall of the slit in an axial direction of the inner column.


Patent
NSK Ltd. | Date: 2017-05-10

There is provided a linear motion guide device that is reduced in a contact surface pressure between a ball and a raceway groove so that an occurrence of an edge load can hardly occur, even when any of a pressing load, a tensile load, and a lateral load is applied to a slider. Upper flanks (20U) and lower flanks (20L) included in raceway grooves (10, 11) of a guide rail (1) and a slider (2) each include: a main arc portion (21) having an arc-shaped section and placed generally in a center of the flank (20U, 20L) in a width direction; a groove shoulder side sub-arc portion (23) having an arc-shaped section and formed continuously from a groove shoulder side of the main arc portion (21) ; and a groove bottom side sub-arc portion (25) having an arc sectional shape and formed continuously from a groove bottom side of the main arc portion (21). Further, a curvature radius (r2P) of the groove shoulder side sub-arc portion (23) is different from a curvature radius (r2m) of the groove bottom side sub-arc portion (25)..1


[Problem] An object of the present invention is to precisely and efficiently perform a connection between a motor and a control unit with a connection part configured as a single member in a case that the control unit is arranged adjacent the motor along a direction of the rotational shaft of the motor. [Means for solving the problem] The present invention is the connection part 100 for connecting the motor 200 and the control unit 300, and the connection part 100 comprising a ring shape control unit mounting flange 130 and a relay terminal 150, wherein the relay terminal comprises a conductive body 151 which electrically connects a conductive terminal formed to be protruded from the motor and a control terminal of the control unit, and a protection section which surrounds a periphery of the conductive terminal formed to be protruded from the motor.


[Problem] An object of the present invention is to provide a motor control unit that does not make an occurrence of a noisy sound and a vibration and does not give a steering discomfort by changing parameters of a current feedback control section even if an electric characteristic of the motor varies with a system-switching due to a failure occurrence, and to an electric power steering apparatus using the same and a vehicle. [Means for solving the problem] The present invention relates to a motor control unit that controls a motor having multi-system motor windings by means of a 3-phase current feedback system provided with a current control section through a motor driving circuit of each winding system, having: a function that changes by switching parameters of the current control section corresponding to a driving system number of the multi-system motor windings.


Patent
NSK Ltd. | Date: 2017-05-24

[Problem] An object of the present invention is to provide an electric power steering apparatus that abates the shock energy with an attenuation of the power at the end hitting time by stopping the current command value near the rack end, does not give the uncomfortable feeling to the driver and suppresses a hitting sound. [Means for solving the problem] The present invention is an electric power steering apparatus that calculates a current command value based on at least a steering torque and assist-controls a steering system by driving a motor based on the current command value, wherein has a function to detect a steering angle on a steering and comprises a gain section having a gain characteristic that a gain changes corresponding to the steering angle, wherein a new current command value is generated by multiplying the current command value with the gain outputted from the gain section corresponding to the steering angle, and the gain characteristic is a constant value 1.0 till a steering angle 1 short of a rack end, gradually decreases till a steering angle 2 (>1) exceeding the rack end and holds a constant value G (>0) in a region that the steering angle is equal to or more than the steering angle 2.


A driving-side transmission portion (20) of an output shaft (12a) of an electric motor and a driven-side transmission portion (26) of a worm shaft (6a) are coupled to each other via a torque transmission joint (16) including an elastic member (18) and a coupling (30), such that the torque can be transmitted. One axial end portion of a coupling-side concave-convex portion (31) of the coupling (30) is engaged with a first driving-side concave-convex portion (21) of the driving-side transmission portion (20) with a gap in the circumferential direction, and the other axial end portion thereof is engaged with a first driven-side concave-convex portion (27) of the driven-side transmission portion (26) with a gap in the circumferential direction. The elastic member (18) is provided between an axial center portion of the coupling-side concave-convex portion (31), and a second driving-side concave-convex portion (22) of the driving-side transmission portion (20) and a second driven-side concave-convex portion (28) of the driven-side transmission portion (26), such that the torque can be transmitted respectively. Accordingly, it is possible to suppress generation of a gear striking noise when the rotational direction of the output shaft, which is a driving shaft, of the electric motor is changed.


Patent
NSK Ltd. | Date: 2017-06-14

Provided is an electric power steering apparatus that is both lightweight and rigid. A lightweight electric power steering apparatus is achieved wherein a gear housing 45 that houses an electric assist mechanism, a lower support bracket 54 for fastening the gear housing 45 to the vehicle body, a sensor housing 56 that houses a torque sensor 57, an outer column 30 of a steering column 6c, and an upper support bracket 59a for fastening the middle section of the outer column 3 to the vehicle body are all integrally formed of synthetic resin with glass fibers, improving the strength of the joined sections of these members.

Loading NSK Ltd. collaborators
Loading NSK Ltd. collaborators