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    • 7. 发明公开
    • FEED SCREW MECHANISM AND ELECTRIC ACTUATOR
    • EP4411175A1
    • 2024-08-07
    • EP22875744.9
    • 2022-09-07
    • NTN Corporation
    • OKU YutaKATO AkioSAKAI Kayo
    • F16H25/24H02K7/06
    • H02K7/06F16H25/24
    • A feed screw mechanism (30) includes: a rotary member (31) having a female screw portion (31a) on an inner peripheral surface; a linear motion member (32) having, on an outer peripheral surface, a male screw portion (32a) that is directly or indirectly screwed to the female screw portion (31a) and making a linear motion with rotation of the rotary member (31); a lubricant housed between the female screw portion (31a) and the male screw portion (32a); a housing (5) that houses the rotary member (31) and the linear motion member (32); and a wall portion (36) protruding, in a radial direction, from the outer peripheral surface of the linear motion member (32). The wall portion (36) makes a linear motion together with the linear motion member (32), and an outer radial end portion of the wall portion (36) is disposed: so as not to contact the inner peripheral surface of the housing (5) and a member provided on the inner peripheral surface of the housing (5); or so as to be slidable with respect to the inner peripheral surface of the housing (5) or the member provided on the inner peripheral surface of the housing (5).
    • 9. 发明公开
    • STEER-BY-WIRE STEERING SYSTEM
    • EP4406815A1
    • 2024-07-31
    • EP22872801.0
    • 2022-09-14
    • NTN Corporation
    • SATO Koji
    • B62D5/04
    • B62D5/04B62D5/005B62D5/006
    • A steer-by-wire type steering system is provided in which a steering actuator changes the direction of steered parts based on the operation amount of a steering wheel detected by a steering sensor; in which when the direction of the steered parts reaches the stroke end, the driver can reliably perceive this situation via the steering wheel; and in which even while no electric power is being supplied, the steering wheel can be locked. The steer-by-wire type steering system includes a shaft (4) coupled to the steering wheel so as to rotate in unison with the steering wheel; an outer ring (21) having an inner periphery disposed around the shaft (4); engagement elements (24) disposed between the shaft (4) and the inner periphery of the outer ring (21); a cage (25) retaining the engagement elements (24), and disposed to be circumferentially movable between an engagement position where the engagement elements (24) are engaged with the shaft (4) and the inner periphery of the outer ring (21), and a disengagement position where the engagement elements (24) are disengaged from the shaft (4) and the inner periphery of the outer ring (21); a centering spring (26) that elastically retains the cage (25) at the disengagement position, and that is rotationally fixed to the shaft (4) and the cage (25) so as to rotate in unison with the shaft (4); and a non-excited operation type electromagnetic brake (27) that brakes the cage (25).