Nsk Corporation

Kawasaki Jukogyo Kabushiki Kaisha

Hirofumi Itagaki

Masahiro Kita

Hideyuki Imai

Kenichiro Tanaka

Kippei Matsuda

Kenji Komatsu

Hiroshi Kawahara

Naohiro Hitomi

Hiroki Hashiguchi

Azusa Hidaka

Hiroki Nishida

Hikari Yoshimi

Naofumi Fujita

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.

Frictional roller reducer

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.

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 passageis provided for supplying lubrication oil to the inside of each pocketin the inside portion in the radial direction of a retainerthat holds a plurality of more than one rollerarranged in a row in the radial direction. The center axis Oof a discharge portthat is provided on an end portion on the downstream side of the oil passageand that opens to the inside surface in the radial direction of the pocketis inclined toward the front side in the rotational direction of the retainerwith respect to the center axis of the pocket

Pressing device for toroidal continuously variable transmission

Provided is a pressing device for toroidal continuously variable transmission capable of reducing hysteresis that occurs between torque and pressing force. An intermediate sliding memberis provided in at least one location of a portion between an end surface on the outside in the radial direction of the retainerof the rollerarranged on the outermost side in the radial direction and an inside surface of the pocketon the outside in the radial direction, and a portion between an end surface on the outside in the radial direction of the retainerof one rollerof adjoining rollersin the radial direction and an end surface on the inside in the radial direction of the retainerof another roller. As a result, the contact area of a sliding contact portionis made smaller than in a case where an intermediate sliding memberis not provided.

Growing community of inventors

Fujisawa, Japan

Hirofumi Itagaki