Unipres Corporation

Jatco Corporation

Atsushi Kobayashi

Yutaka Murata

Ryosuke Suzuki

Hideyuki Nezu

Takashi Matsuura

Ryo Shirosaki

Mutsumi Mitarai

Yuuta Oono

Yoichi Furuichi

A torsional vibration reduction apparatus has coil springs. The coil springs are received in paired input member side coil spring receiving portions and an output member side coil spring receiving portion. The paired input member side coil spring receiving portions comprise forward rotation side and reverse rotation side guide portions between forward rotation side and reverse rotation side spring pedestals. The output member side coil spring receiving portion comprises forward rotation side and reverse rotation side guide portions between forward rotation side and reverse rotation side spring pedestals. In forward rotation and reverse rotation, since the displacement of the coil springs under the centrifugal force is received by the guide portions and the vertical component force of the elastic force is small, sliding resistance is suppressed, the hysteresis torque is reduced, additive components are not required, and the installation positions of the coil springs cannot be restricted.

Torsional vibration reduction apparatus

The present invention relates to a two-speed transmission for an electric driving vehicle and the two-speed transmission for an electric vehicle has only one actuator. The transmission comprises a planetary gear mechanism (), an elastic body (), an armature () to integrally rotate with an input axis, an electromagnetic coil () and a multi-plate friction clutch (). A ring gear () is fixed to a housing. The armature () comprises clutch projection portions (-). A dog clutch is constituted by the clutch projection portions (-) and recess portions (-) of a sun gear (). When the electromagnetic coil () is not electrically energized, the dog clutch is engaged. The rotation of the input axis is reduced and is transmitted to an output axis via the sun gear () and a carrier (). When the electromagnetic coil () is electrically energized, the armature () is displaced against elastic force, the dog clutch becomes a non-engaging state, a multi-plate friction clutch () becomes an engaging state by pressing flange portions (-) of the armature () and the rotation of the input axis is transmitted to the output axis with a one-to-one relationship. The transmission can comprise a one-way clutch to prevent torque interruption when switching the gear ratio.

Two-speed transmission for electric driving vehicle

The present invention relates to a dynamic damper provided with a planetary dear device and damper springs and aims to obtain an increased adjustable range of gear ratio for obtaining a desired reduction of rotating fluctuation and to reduce a size in a radial direction. A plurality of planetary gearsare provided, each forms a stepped shape (Ravigneau type planetary gear device) and is constructed by a small diameter pinionand a large diameter pinionjuxtaposed in an axial direction so as to be rotated integrally. Rotating elements, which are selectively and desirably arranged to mesh with the small diameter pinionand the large diameter pinion, are large diameter and small diameter ring gears and large diameter and small diameter sun gears. In addition to a carrier connecting the plurality of stepped shaped planetary gears, two rotating elements are selected from the large diameter and small diameter ring gears and the large diameter and small diameter sun gears. Among the selected elements, two selected rotating elements, for example, the large diameter sun gear and the carrier are assigned to the inlet and the outlet elements, respectively and the remaining small sun gearis assigned to the mass element.

Dynamic damper

Along a peripheral wall surface of a pump housing at a closure portion where a working fluid in a volume chamber defined by engagement of an inner rotor and an outer rotor, is enclosed, a liquid pressure is relieved by the liquid pressure relieving groove for relieving a liquid pressure of the working fluid from the volume chamber to a sliding gap along an outer peripheral surface of the outer rotor.

Growing community of inventors

Fuji, Japan

Atsushi Kobayashi