公开(公告)号：US11892060B2

公开(公告)日：2024-02-06

申请号：US17926873

申请日：2021-12-03

Applicant: NSK LTD.

Inventor： Hiroshi Kawahara ,  Hiroki Hashiguchi ,  Hirofumi Itagaki ,  Azusa Hidaka ,  Hiroki Nishida ,  Naofumi Fujita ,  Hikari Yoshimi ,  Naohiro Hitomi ,  Masahiro Kita

IPC: F16H13/08 ,  F16H13/14 ,  F16H57/04

CPC classification number: F16H13/08 ,  F16H13/14 ,  F16H57/043 ,  F16H57/0486

Abstract: A frictional roller reducer having a sun roller; a ring roller; a plurality of intermediate rollers having rolling surfaces coming in rolling contact with the sun roller and the ring roller; the sun roller or the ring roller having a pair of roller elements including inclined surface portions on a circumferential surface coming in rolling with rolling surfaces, the inclined surface portions inclined in directions going toward the intermediate rollers in a radial direction as going away from each other in the axial direction; a pressing device pressing the pair of roller elements in directions going closer to each other, and an elastic member arranged between the pair of roller elements, the elastic member urging the pair of roller elements in directions going away from the rolling surface of the intermediate rollers.

公开(公告)号：US20220221031A1

公开(公告)日：2022-07-14

申请号：US17440950

申请日：2020-01-10

Applicant: NSK LTD.

Inventor： Hiroshi Kawahara ,  Hirofumi Itagaki

IPC: F16H13/10 ,  F16H13/08

Abstract: A structure is achieved capable of ensuring excellent transmission efficiency while preventing the occurrence of gross slipping at traction portions.
A pressing device 9 rotationally drives a cam disk 21 by a pressing force adjusting motor 23, which causes an annular roller element 6a of a pair of annular roller elements 6a, 6b to displace in the axial direction. A controller 31, by adjusting the rotational drive of the pressing force adjusting motor 23, adjusts the surface pressure at the traction portions between rolling surfaces 16 of planetary rollers 7 and an inner-diameter side rolling contact surface 5 of an input shaft 3 and outer-diameter side rolling contact surfaces 12a, 12b of the pair of annular roller elements 6a, 6b to a target value.

公开(公告)号：US11867262B2

公开(公告)日：2024-01-09

申请号：US17440950

申请日：2020-01-10

Applicant: NSK LTD.

Inventor： Hiroshi Kawahara ,  Hirofumi Itagaki

IPC: F16H13/08 ,  F16H13/10

CPC classification number: F16H13/10 ,  F16H13/08

Abstract: The frictional roller reducer has an input shaft, an output shaft, a pair of annular roller elements, a plurality of planetary rollers, a carrier, a pressing device, and a controller. The pressing device rotationally drives a cam disk by a pressing force adjusting motor, which causes an annular roller element of the pair of annular roller elements to displace in the axial direction. The controller, by adjusting the rotational drive of the pressing force adjusting motor, adjusts the surface pressure at the traction portions between rolling surfaces of the planetary rollers and an inner-diameter side rolling contact surface of the input shaft and outer-diameter side rolling contact surfaces of the pair of annular roller elements to a target value.

公开(公告)号：US11333225B2

公开(公告)日：2022-05-17

申请号：US16495451

申请日：2018-03-20

Applicant: NSK LTD. ,  KAWASAKI JUKOGYO KABUSHIKI KAISHA

Inventor： Hirofumi Itagaki ,  Masahiro Kita ,  Kippei Matsuda ,  Kenichiro Tanaka ,  Hideyuki Imai ,  Kenji Komatsu

IPC: F16H15/38 ,  F16H57/04

Abstract: Provided is a pressing device for a toroidal continuously variable transmission that is capable of sufficiently supplying lubrication oil to all rollers inside a pocket, and is capable of suppressing the occurrence of fretting wear on the rolling surfaces of the rollers, a first cam surface and a second cam surface. An oil passage 28 is provided for supplying lubrication oil to the inside of each pocket 25 in the inside portion in the radial direction of a retainer 14 that holds a plurality of more than one roller 13 arranged in a row in the radial direction. The center axis O29 of a discharge port 29 that is provided on an end portion on the downstream side of the oil passage 28 and that opens to the inside surface in the radial direction of the pocket 25 is inclined toward the front side in the rotational direction of the retainer 14 with respect to the center axis of the pocket 25.

公开(公告)号：US10948055B2

公开(公告)日：2021-03-16

申请号：US16495599

申请日：2018-03-20

Applicant: NSK LTD. ,  KAWASAKI JUKOGYO KABUSHIKI KAISHA

Inventor： Hirofumi Itagaki ,  Masahiro Kita ,  Kippei Matsuda ,  Kenichiro Tanaka ,  Hideyuki Imai ,  Kenji Komatsu

IPC: F16H15/38

Abstract: Provided is a pressing device for toroidal continuously variable transmission capable of reducing hysteresis that occurs between torque and pressing force. An intermediate sliding member 27 is provided in at least one location of a portion between an end surface on the outside in the radial direction of the retainer 13 of the roller 14 arranged on the outermost side in the radial direction and an inside surface of the pocket 25 on the outside in the radial direction, and a portion between an end surface on the outside in the radial direction of the retainer 13 of one roller 14 of adjoining rollers 14 in the radial direction and an end surface on the inside in the radial direction of the retainer 13 of another roller 14. As a result, the contact area of a sliding contact portion 32 is made smaller than in a case where an intermediate sliding member 27 is not provided.