Control valve for prime mover speed control in hydraulic...

F - Mech Eng,Light,Heat,Weapons – 15 – B

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Details

F15B 13/042 (2006.01) E02F 9/22 (2006.01) F15B 11/04 (2006.01) F15B 11/05 (2006.01) F15B 13/04 (2006.01)

Patent

CA 2247399

A control valve (10) is provided for mobile or stationary hydraulic equipment for automatically increasing or decreasing speed of a prime mover in response to operation of a hand lever to extend a hydraulic cylinder. A prime mover speed control valve (42) is integrated with a spool (12) in a single housing (10) for the purpose of simultaneously controlling the supply of fluid to a hydraulic cylinder (16) and to a cylinder (61) controlling prime mover speed. When the spool (12) is in the "CYLINDER EXTEND" or "NEUTRAL" position for the implement cylinder, a hydraulic control signal is provided from port (55) to the prime mover control cylinder (61) to signal increased prime over speed and increased output from a hydraulic pump (17). When the spool (12) is in the "CYLINDER RETRACT" position for the implement cylinder (16), the spool (12) blocks the signal from port (55) while allowing fluid to drain from the implement cylinder (16) to a reservoir (29).

Présentation d'une soupape de régulation (10) destinée à des équipements hydrauliques fixes ou mobiles et permettant d'augmenter ou de baisser automatiquement la vitesse du moteur premier en réponse à la commande d'un levier à main qui fait sortir un vérin hydraulique. Une soupape de régulation (42) du moteur premier est intégrée au même boîtier (10) avec un tiroir hydraulique (12), régulant simultanément l'arrivée d'un fluide vers le vérin hydraulique (16) et vers le vérin (61) qui régule la vitesse du moteur premier. Lorsque le tiroir (12) se trouve en position "sortie vérin" ou "point mort" pour le vérin de travail, un signal de commande hydraulique est envoyé depuis le port (55) vers le vérin de commande du moteur premier (61) afin de signaler l'augmentation de la vitesse du moteur premier et du débit de la pompe hydraulique (17). Lorsque le tiroir (12) se trouve en position "rentrée vérin" pour le vérin de travail (16), le tiroir (12) bloque le signal provenant du port (55) mais permet au liquide de s'écouler depuis le vérin de travail (16) dans un réservoir (29).

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