F - Mech Eng,Light,Heat,Weapons – 16 – F
Patent
F - Mech Eng,Light,Heat,Weapons
16
F
F16F 9/04 (2006.01) F16F 9/05 (2006.01)
Patent
CA 2426755
A dual volume air spring (5) for a truck suspension, which has an air bag chamber providing a variable volume (6) and a fixed volume chamber (7). The chambers are interconnected by a closable orifice (12). The air bag is provided with a post-like orifice closer (20) which is pushed into the orifice when the air bag (9) is sufficiently compressed ad withdrawn from the orifice when the air bag is not compressed. In normal operation the orifice is open and combined volumes of the chambers are available resulting in a low spring rate. The orifice closer (20) has an orifice closing portion (22) which is relatively pliant and a rigid or semi-rigid portion (21) which acts as a bump- stop when the pliant portion is substantially completely compressed. When the orifice is completely closed the spring has a high spring rate.
L'invention porte sur un ressort pneumatique à volume double pour suspension de camions comportant une chambre à enveloppe souple à volume variable, et une chambre à volume fixe. Les chambres sont reliées par un orifice obturable. La chambre à enveloppe souple est munie d'un obturateur en forme de tige qui s'introduit dans ledit orifice quand l'enveloppe souple est suffisamment comprimée, et en ressort quand l'enveloppe souple n'est pas comprimée. En fonctionnement normal, l'orifice est ouvert et les volumes combinés des chambres sont disponibles, ce qui donne un ressort à faible raideur. L'obturateur de l'orifice comporte une partie obturante relativement souple, et une partie rigide ou semi-rigide constituant une bosse d'arrêt lorsque la partie souple est sensiblement entièrement comprimée. Lorsque l'orifice est totalement obturé, le ressort la raideur du ressort s'accroît.
Hendrickson International Corporation
Osler Hoskin & Harcourt Llp
The Boler Company.
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