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Electric assist device for a bicycle and electrically assisted bicycle provided with such a device

  • US 9,533,734 B2
  • Filed: 12/02/2013
  • Issued: 01/03/2017
  • Est. Priority Date: 12/05/2012
  • Status: Active Grant
First Claim
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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 teeth;

    an articulating structure that includes an oscillating arm, which carries the electric machine, and a support portion, which is fastened to the bicycle in a vicinity of a tire of a wheel of the bicycle, the support portion being in a fixed position relative to the bicycle, and the oscillating arm being arranged to pivot about a pivot axis with respect to the support portion; and

    a source of electrical energy for powering the electric machine,wherein the teeth of the drive pinion are structured to mesh tangentially with complementary teeth attached to the tire.

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