Dual spring rate damper

B - Operations – Transporting – 60 – G

Patent

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Details

B60G 13/00 (2006.01) B60G 15/00 (2006.01) F16F 5/00 (2006.01) F16F 7/00 (2006.01) F16F 9/00 (2006.01) F16F 9/10 (2006.01) F16F 9/34 (2006.01) F16F 11/00 (2006.01)

Patent

CA 2533201

A damper has a piston having an axis, an outer surface, and opposing ends. Elastomeric seals are in sealing contact with the outer surface of the piston, the seals being coaxial with the piston and limiting movement of the piston to a path along the axis of the piston. The seals also define fluid chambers adjacent the ends of the piston. A primary passage communicates the fluid chambers, and a selectively switchable valve for controls a flow of fluid from one of the chambers to another of the chambers through the primary passage. When the flow of fluid through the primary passage is permitted, movement of the piston is resisted by a first spring rate due to a shear force required to cause shear deflection of the seals. When the flow of fluid through the primary passage is restricted, movement of the piston is resisted by a second spring rate due to a fluid force required to cause bulging deflection of the seals.

L'invention porte sur un amortisseur comportant un piston présentant un axe, une surface extérieure et deux extrémités opposées. Des joints d'élastomères, en contact étanche avec la surface extérieure du piston et coaxiaux avec le piston en limitent le déplacement à une course le long de l'axe du piston. Lesdits joints délimitent des chambres remplies de fluide jouxtant les extrémités du piston. Un passage primaire communique avec les chambres remplies de fluide et une soupape commutable commande le flux de fluide passant d'une chambre à l'autre par le passage primaire. Lorsque le fluide peut passer dans le passage primaire le déplacement du piston est contrarié par un ressort d'une première force de rappel due à la force de cisaillement requise pour provoquer la déflexion des joints. Lorsque le flux de fluide traversant le passage primaire est restreint le déplacement du piston est contrarié par un ressort d'une deuxième force de rappel due à la force du fluide requise pour provoquer une déflexion en saillie des joints.

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