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Pub. No.:    WO/1979/000411    International Application No.:    PCT/US1978/000172
Publication Date: 12.07.1979 International Filing Date: 22.11.1978
B60G 11/27 (2006.01), F16F 9/05 (2006.01)
Priority Data:
862435 20.12.1977 US
Abstract: front page image
(EN)A heavy duty rolling lobe air spring (12), especially for trucks and trailers, which has an open hollow piston (32) providing a reservoir (34) and an outer surface on which the lobe of a flexible sleeve (18) rolls. The surface includes a horizontal top (42), a gently curved outer surface (43) joining an inverted frustro-conical side (44) and terminating in an outwardly flared bottom portion (48). Previous rolling lobe air springs adapted for heavy design loads have a high spring rate which fails to provide a soft, smooth ride only achieved in air springs having a low spring rate. The rolling lobe air spring (12) achieves a low spring rate providing a soft, smooth ride for heavy design loads. The side surface (44) has an angle with respect to the axis of the piston (32) of about 23 . The volume of the piston (32) and sleeve (18) of 850 to 1500 cu. in. (13,900-24,600 cu. cm.) and the angle of the frustro-conical surface (44) are such that the effective area of the sleeve (18) decreases under jounce and the spring rate is in the range of 100 to 300 pounds per inch (17.5-52.5 KN/m) at a design load in the range of 1000-8000 pounds (454-3629 kg).
(FR)Un ressort a air (12) de grande puissance, en particulier pour camions et semi-remorques, comprend un piston creux ouvert (32) formant reservoir (34) et muni d"une surface exterieure sur laquelle se deroule un manchon flexible (18). Ladite surface comprend une partie superieure plate (42) et une surface courbe reguliere (43) se raccordant a une surface conique inversee (44) et se termine par une partie evasee (48) evasee vers le bas. Les ressorts a air a deroulement connus qui sont prevus pour des charges lourdes ont une petite flexibilite qui ne permet pas d"obtenir un comportement routier doux et equilibre, ce qui est uniquement atteint par les ressorts a air a grande flexibilite. Le ressort a air (12) a deroulement a une grande flexibilite et permet d"obtenir un comportement routier doux et equilibre pour des charges lourdes. La surface laterale (44) forme avec l"axe du piston (32) un angle d"environ 23 . Le volume du piston (32) et du manchon (18) compris entre 13900 et 24600 cm3 et l"angle de la surface tronconique (44) sont choisis tels que la surface effective du manchon (18) diminue sous une secousse et que la flexibilite soit comprise entre 17,5 et 52,5 KN/m a une charge normale de 454 a 3629 kg.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)