Title:
ELECTRIC POWER STEERING DEVICE AND VEHICLE PROVIDED WITH THE SAME
Document Type and Number:
Japanese Patent JP2015229378
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To suppress a rattle noise caused by a gap inside a shaft bearing of a worm gear mechanical unit and backlashes while transmitting torque in a non-contact manner.SOLUTION: In an electric power steering device 9, an output shaft 13a is arranged eccentrically toward a worm wheel 22 side with respect to a worm shaft 21, and a magnetic reduction gear 30 having a pair of disks 31, 32 is provided at a joint part of the output shaft 13a and the worm shaft 21. The magnetic reduction gear 30 is provided with a permanent magnet pair 50 including a first annular magnet row 51 arranged on one disk face and a second annular magnet row 52 arranged on the other disk face. The first annular magnet row 51 and the second annular magnet row 52 are arranged such that different poles are disposed to oppose to each other in the axial direction, when respective plural permanent magnets are at positions where torque is transmitted between mutual disk faces in a non-contact manner, and the numbers of respective plural permanent magnets are set according to a gear reduction ratio.
Inventors:
MAEDA ATSUSHI
Application Number:
JP2014115116A
Publication Date:
December 21, 2015
Filing Date:
June 03, 2014
Export Citation:
Assignee:
NSK LTD
International Classes:
B62D5/04; F16D7/02; F16H49/00
Attorney, Agent or Firm:
Yoshiaki Naito