Torque motor

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

Patent

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Details

F15B 15/06 (2006.01)

Patent

CA 2642613

The present invention relates to a torque motor comprising a long tubular housing, a piston (3), which is mounted in said housing in an axially displaceable manner and can be axially driven by being subjected to a pressure fluid in a pressure chamber, and at least one shaft (6) that is mounted in an axially fixed manner inside the housing and is configured so as to rotate about an axis of rotation. The piston comprises a recess at the shaft hole, thereby allowing the piston to be axially displaceable on the shaft. According to the invention, the shaft forms a camshaft whose rotating axis (7) is offset relative to the recess at the shaft hole. The shaft part that extends slidably through the respective recess at the shaft hole has a lever arm relative to the axis of rotation of the shaft, thereby converting the radial force produced by the axial displacement of the piston and the pitch of the helical engagement path between the shaft and the piston and/or between the piston and the housing during the engagement of shaft and piston into a rotational movement of the shaft relative to the housing (1) or vice versa. According to the invention, the recess at the shaft hole is arranged approximately in the center of the piston in relation to the piston cross-section, a rotational locking of the piston not being required.

L'invention concerne un moteur-couple comportant un carter tubulaire allongé, un piston (3) logé de façon axialement coulissante dans le carter, pouvant être entraîné axialement sous l'effet d'un fluide de pression dans une chambre de pression, et un arbre (6) logé de façon axialement fixe dans le carter, et de façon à tourner autour d'un axe de rotation, le piston présentant un évidement de passage d'arbre avec lequel le piston est logé de façon axialement coulissante sur l'arbre. L'arbre forme un vilebrequin dont l'axe de rotation (7) est décalé par rapport à l'évidement de passage d'arbre. La partie d'arbre coulissant au travers de l'évidement de passage d'arbre présente un bras levier par rapport à l'axe de rotation de l'arbre, convertissant la force radiale produite par le décalage axial du piston et par la pente de la voie de prise spiralée entre l'arbre et le piston et/ou entre le piston et le carter, lors de la prise entre l'arbre et le piston, en un mouvement de rotation de l'arbre par rapport au carter (1) ou inversement. Selon l'invention, l'évidement de passage d'arbre est logé de façon essentiellement centrale dans le piston par rapport à la section transversale du piston, une sécurité antitorsion du piston n'étant pas nécessaire.

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