Three-position shift actuator

F - Mech Eng,Light,Heat,Weapons – 16 – H

Patent

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Details

F16H 59/04 (2006.01) F16H 61/30 (2006.01) F16H 63/30 (2006.01) F16H 61/12 (2006.01) F16H 61/70 (2006.01) F16H 63/44 (2006.01)

Patent

CA 2116719

A three-position actuator assembly for selectively shifting a three-speed splitter type auxiliary transmission section (14) is provided. The actuator assembly includes a piston portion (160) for axially moving a selected one of two shift forks (142/148) and a control circuit (162) comprising three three-way, two-position solenoid controlled valves (202/204/206) and two three-way shuttle valves (214/216). Only one solenoid is energized for each selectable actuator position and a failure of the pneumatic (200) or electrical power sources to the control circuit will not cause the actuator to shift out of an engaged ratio.

Cette invention concerne un sélecteur trois positions servant à passer les vitesses d'une transmission auxiliaire à trois rapports (14) du type répartiteur de puissance. Le sélecteur comporte un piston (160) destiné à déplacer axialement l'une des deux fourchettes de débrayage (142/148) et un circuit de commande (162) comportant trois soupapes trois voies commandées par solénoïde à deux positions (202/204/206) et deux clapets tiroirs trois voies (214/216). Chaque position du sélecteur nécessite l'excitation d'un seul solénoïde et, en cas de perte d'énergie pneumatique (200) ou électrique, le circuit de commande ne forcera pas la sortie du sélecteur du rapport engagé.

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