Device and method for setting the torque transmitted by a...

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

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F16H 1/00 (2006.01) F16D 27/00 (2006.01) F16D 27/115 (2006.01) F16D 48/06 (2006.01) F16H 1/14 (2006.01)

Patent

CA 2460726

The intention of a device for setting the torque transmitted by a friction clutch (12), having an actuator chain which comprises an electric motor (45), a step-down gear (42) and a mechanism for converting the rotational movement into a displacement of a pressure plate (29) of the clutch (12), is to enable the torque which is transmitted to be set precisely and rapidly even given high friction. For this purpose, the electric motor (45) and/or step-down gear (42) is/are affected by friction, the conversion mechanism (31, 32, 35, 36, 40) and/or the friction clutch (12) itself is/are affected by elasticity, and, to set the torque (Md) of the friction clutch (12), a position regulator (47) which is operatively connected to the electric motor (45) and a sensor (46; 46') which determines the position of one of the links of the actuator chain (45, 42, 41, 40, 36, 35, 32, 31, 29) are provided, the sensor being present at a location upstream of a substantial part of the elasticity in the force-flow direction. The corresponding control and calibrating method is also developed.

L'invention concerne un dispositif servant à régler le couple transmis par un embrayage à friction (12). Ce dispositif comprend une chaîne de commande constituée d'un moteur électrique (45), d'un démultiplicateur (42) et d'un mécanisme pour convertir le mouvement rotatif en un déplacement d'une plaque de pression (29) de l'embrayage à friction (12). L'objectif de l'invention est de permettre un réglage précis et rapide du couple transmis, même en cas de friction importante. A cet effet, le moteur électrique (45) et/ou le démultiplicateur (42) sont sujets à la friction ; le mécanisme de conversion (31, 32, 35, 36, 40) et/ou l'embrayage à friction (12) lui-même sont sujets à l'élasticité ; pour régler le couple (Md) de l'embrayage à friction (12), on fait appel à un régulateur de position (47) lié fonctionnellement au moteur électrique (45) et à un capteur (46 ; 46') déterminant la position d'un des éléments de la chaîne de commande (45, 42, 41, 40, 36, 35, 32, 31, 29), ce capteur étant placé, dans le sens du flux de puissance, en amont d'une partie essentielle de l'élasticité. L'invention concerne en outre le procédé de commande et d'étalonnage correspondant.

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