Actuator device for a bicycle gearshift

Abstract

An actuator device (1) for a bicycle gearshift, comprising: an articulated quadrilateral mechanism (10) intended to be integrally fixed to a bicycle frame and to a derailleur of the gearshift, a motor member (2) acting on the articulated quadrilateral mechanism (10) to deform the articulated quadrilateral (10), thus causing the displacement of the derailleur and a support element (5) for the motor member (2) associated with the articulated quadrilateral (10). According to the invention, one of the motor member (2) and the support element (5) comprises at least one jutting element (8) and the other of the motor member (2) and the support element (5) comprises at least one seat (6) adapted to receive said jutting element (8). In such a way the motor member (2) is associated with the support element (5) so as to prevent mutual translations in the axial direction in any operating or climatic condition. <IMAGE>

Description

technical field [0001] The present invention relates to an actuating device for a bicycle gearshift, ie to a mechanical device for displacing a chain between different gears for the purpose of displacing the derailleur and thereby driving the chain itself. Background technique [0002] Throughout the present specification and subsequent claims, the shifting mechanism referred to may be a rear shifting mechanism that drives a chain coupled between different sprockets in the rear wheel of a bicycle, or it may be a front The derailleur, the front derailleur, drives the chain between the different crown gears coupled to the pedal cranks. [0003] Typically, the actuating device of the shift mechanism comprises an articulated quadrilateral mechanism integrally fixed to the bicycle frame and the shifter of the shifter; deformation of the hinged quadrilateral causes the shifter to displace, thereby effecting the shifting. [0004] The above-mentioned deformation of the articulated...

AI Technical Summary

Problems solved by technology

Especially in hot and cold environments, this effect will be highlighted, and the coupling between the motor and the support will be further deteriorated due to the different expansion coefficients of the materials that make up the motor housing and the support.

The undesired axial displacement of the electric motor relative to the support leads to a corresponding displacement of the drive shaft relative to the transmission components, thus degrading the actuation precision of the transmission

Undesirable axial displacement can also be caused by accidental bumps into the transmission

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