Mitsubishi Heavy Industries Limited

Waseda University

Isamu Shiotsu

Hiroyuki Sonobe

Takeshi Yoshimi

Yasuyoshi Tozaki

Takayoshi Hirayama

Akihiko Umeda

Susumu Matsumoto

A first rotary shaft and a second rotary are rotatable around a rotation axis. The second rotary shaft has a cylindrical supporting part that covers an end section of the first rotary shaft. A case supports the first and second rotary shafts. A first rolling bearing is disposed between the first rotary shaft and the case and rotatably supports the first rotary shaft. A second rolling bearing is disposed between the supporting part and the first rotary shaft and supports the first rotary shaft and the second rotary shaft such that they are rotatable relative to each other. A transmission part of the second rotary shaft transmits to the second rolling bearing a preload force that pushes the second rotary shaft to the first rotary shaft side. A load-receiving part of the case receives the preload force transmitted from the second rolling bearing to the first rolling bearing.

Speed increasing/decreasing apparatus

A micro-traction drive includes an inner ring formed rotatably supported about an axis; an outer ring having a larger diameter than the inner ring; rolling elements rolling while being in contact with an outer circumferential surface of the inner ring and an inner circumferential surface of the outer ring; a retaining portion that keeps the rolling elements apart from one another; a pressing portion that applies a preload between the inner ring and the rolling elements and between the outer ring and the rolling elements; and an input shaft that is formed to have a smaller diameter than the inner circumferential surface of the inner ring, is disposed adjacent to the inner ring, and transmits a rotational driving force to the inner circumferential surface of the inner ring. One of the outer ring and the retaining portion is connected to the output shaft, and the other thereof is fixed.

Micro-traction drive

There is provided a compact and highly durable variable-speed traction drive transmission device. A traction drive transmission device which uses the traction of rolling bodies K arranged between an input shaft Si and an output shaft So to change the number of revolutions of the input shaft Si into a desired transmission ratio and output from the output shaft So, has a rotation axis of the rolling bodies K arranged at an incline so that it is not orthogonal to the axis of the input shaft Si and the output shaft So, and there is provided: a load regulation camwhich automatically changes a preload applied to the rolling bodies K corresponding to a torque of the input shaft Si; and a differential type transmission ratio variation mechanism using a worm gear, which is connected to a retainerserving as a traction input-output member of the rolling bodies K, and performs number of revolutions control of the retainerto change the transmission ratio.

Torque transmission structure, traction drive transmission device, and steering device for vehicle

This planetary roller driving device includes: a planetary roller speed up gear having a first carrier being a first input axis and a first sun roller being a first output axis; a planetary roller reduction gear having a second sun roller being a second input axis and a second carrier being a second output axis, the second input axis being joined with the first output axis; a roller ring driving mechanism; a housing which accommodates the planetary roller speed up gear, the planetary roller reduction gear, and the roller ring driving mechanism; a roller ring rotation control circuit which controls a rotation of the roller ring driving mechanism corresponding to an external environmental condition; and a torque-assisting mechanism which is provided in the housing and provides an assisting torque to the first input axis or the second output axis.

Growing community of inventors

Ritto, Japan

Isamu Shiotsu