The invention relates to a reduction ratio changing device (1) for a mechanical transmission system with a chain. The reduction ratio changing device (1) comprises a toothing (2, 3). The toothing of the reduction ratio changing device (1) comprises a portion (2), referred to as helical portion, forming a toothed helix winding around an axis of revolution (5) of the reduction ratio changing device, and a portion (3), referred to as circular portion, forming a toothed flat circle, the centre of which coincides with the axis of revolution of the reduction ratio changing device. The helical portion (2) of the toothing extends from a distal end (4) of the toothing of the reduction ratio changing device (1) to the circular portion (3) of the toothing. The circular portion (3) of the toothing of the reduction ratio changing device (1) forms a proximal end (3) of the toothing of the reduction ratio changing device.
Dispositif de changement de rapport de réduction (1), dit DCRR, pour système de transmission mécanique à chaine. Le DCRR (1) comprend une denture (2,3). La denture du DCRR (1) comprend une portion (2), dite portion hélicoïdale, formant une hélice dentée s'enroulant autour d'un axe de révolution (5) du DCRR et une portion (3), dite portion circulaire, formant un cercle plan dentée dont le centre coïncide avec l'axe de révolution du DCRR. La portion hélicoïdale (2) de la denture s'étend depuis une terminaison distale (4) de la denture du DCRR (1) vers la portion circulaire (3) de la denture. La portion circulaire (3) de la denture du DCRR 1 forme une terminaison proximale (3) de la denture du DCRR.
DISPOSITIF DE CHANGEMENT DE RAPPORT DE RÉDUCTION
REDUCTION RATIO CHANGING DEVICE
2023-05-11
Patent
Electronic Resource
French
European Patent Office | 2018
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