Denso Corporation

Hiroshi Nagae

Yasuo Tabuchi

Michiyasu Nosaka

Yoshiki Tada

Mitsuhiro Tanabe

Masahiro Yamashita

Motohiko Ueda

Kouji Kida

A power transmission device includes a pulleyand a hubhaving an inner hub, a rubber damperand an outer hub. A hub side engagement portionformed of an elastic material and arranged at either one, or both, of an inner peripheral surface and an outer peripheral surface of the outer hub engages with a pulley side engagement portion, which is arranged at a position corresponding to the outer hub, of the pulley in a concavo-convex fitting to thereby constitute a torque transmission structure between the hub and the pulley. The hub side engagement portion and the pulley side engagement portion have a concavo-convex outer shape and mesh with each other. A ring-like dust invasion prevention portioncovers a front surface of said concavo-convex fitting.

Power transmission device

A power transmission device includes a pulleyand a hubhaving an inner hub, a rubber damperand an outer hub. A hub side engagement portionformed of an elastic material and arranged either one, or both, of inner peripheral surface and outer peripheral surface of the outer hub engages with a pulley side engagement portion, arranged at a position corresponding to the outer hub, of the pulley in concavo-convex fitting to thereby constitute a torque transmission structure between the hub and the pulley. The hub side engagement portion and the pulley side engagement portion have a concavo-convex outer shape and mesh with each other.

A power transmission apparatus includes a pulleyhaving a belt attached thereto to transmit the rotating drive force, a hubwhich connects the pulley to a rotating shaft of a driven device, a bearingwhich rotatably supports the pulley, and a sleeve ringwhich is fitted and secured to the pulley and attaches the bearing to the pulley to prevent it relatively moving. The sleeve ring is provided, on its first end opposite to the driven device, with a bent portionagainst which the bearing abuts to restrict further movement of the bearing. An annular retaineris provided on the portion of the bearing adjacent to the drive device. The bearing is secured to the sleeve ring through the annular retainer by calking a second endof the sleeve ring opposite to the first end. The sleeve ring is provided with a projectionwhich projects in the axial direction from the rear surface of the pulley and a casingis provided with an annular groovewhich at least partly receives therein the projection.

Growing community of inventors

Toyohashi, Japan

Hiroshi Nagae