Electrical assistance device for a bicycle and electrically assisted bicycle provided with such a device

摘要

An electrical assist device is provided for a bicycle. The device includes an electric machine, a drive pinion, an attachment device, a source of electrical energy, and a controller. The attachment device fixes the electric machine to the bicycle near a tire of a wheel of the bicycle. The source of electrical energy powers the electric machine. The controller controls the electric machine. The electric machine includes a rotor, which drives the drive pinion. The drive pinion includes helicoidal teeth structured to mesh tangentially with complementary teeth fastened to the tire.

主权项

1. An electrical assist device for a bicycle, the device comprising:
an electric machine that includes a rotor; a drive pinion structured to be driven by the rotor of the electric machine, the drive pinion including helicoidal teeth; a fastener structured to include a first portion that articulatingly carries the electric machine and a second portion that is fastened to the bicycle in a fixed position in a vicinity of a tire of a wheel of the bicycle, the first portion being arranged to pivot about a pivot axis with respect to the second portion; and a source of electrical energy for powering the electric machine, wherein the helicoidal teeth of the drive pinion are structured to mesh tangentially with complementary teeth attached to the tire, and wherein an axis of the electric machine is at an inclined angle relative to a plane of the wheel of the bicycle when the electric machine is in a working position.