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1. WO1990013468 - AIR SUSPENSION SYSTEM WITH LOAD CONTROLLED LIFTABLE AXLE

Publication Number WO/1990/013468
Publication Date 15.11.1990
International Application No. PCT/US1989/005752
International Filing Date 21.12.1989
Chapter 2 Demand Filed 02.07.1990
IPC
B62D 61/12 2006.01
BPERFORMING OPERATIONS; TRANSPORTING
62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
DMOTOR VEHICLES; TRAILERS
61Motor vehicles or trailers, characterised by the arrangement or number of wheels, not otherwise provided for, e.g. four wheels in diamond pattern
12with variable number of ground-engaging wheels, e.g. with some wheels arranged higher than others, or with retractable wheels
CPC
B62D 61/125
BPERFORMING OPERATIONS; TRANSPORTING
62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
DMOTOR VEHICLES; TRAILERS
61Motor vehicles or trailers, characterised by the arrangement or number of wheels, not otherwise provided for, e.g. four wheels in diamond pattern
12with variable number of ground engaging wheels, e.g. with some wheels arranged higher than others, or with retractable wheels
125the retractable wheel being a part of a set of tandem wheels
Applicants
  • ALLIED-SIGNAL INC. [US]/[US]
Inventors
  • EBERLING, Charles, Edward
Agents
  • WINTER, Richard, C.
Priority Data
345,81801.05.1989US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) AIR SUSPENSION SYSTEM WITH LOAD CONTROLLED LIFTABLE AXLE
(FR) SYSTEME DE SUSPENSION PNEUMATIQUE AVEC ESSIEU SOULEVABLE A CHARGE CONTROLABLE
Abstract
(EN)
A suspension control system for controlling a liftable axle (20) of a vehicle (10) between a retracted, non-load bearing position and an extended, load bearing position includes a valve mechanism which responds to the pressure level in the air bags (40) of the air suspension system of the non-liftable rear axle of the vehicle (10). The system includes a leveling valve (36) which increases pressure in the air bags (40) to maintain a constant vehicle height. Accordingly, the pressure level in the air bags (40) is directly proportional to vehicle loading. The valve means responds to this pressure level to communicate pressure to the actuator means (26) controlling the liftable axle (20) when the pressure level in the air bags (40) on the non-liftable rear axle attains a predetermined level. The liftable axle (20) responds to this increase in pressure to extend into load bearing engagement with the road.
(FR)
Système de suspension pour la commande de l'essieu soulevable (20) d'un véhicule (10) entre une position rétractée non porteuse de charge, et une position tendue, en charge. Ce système se compose d'un mécanisme à soupape qui réagit au niveau de pression dans les coussins pneumatiques (40) du système de suspension pneumatique de l'essieu arrière non soulevable du véhicule (10). Il comprend une soupape de nivelage (36) qui fait augmenter la pression dans les coussins pneumatiques (40) afin de maintenir le véhicule à une hauteur constante. Le niveau de pression dans les coussins pneumatiques (40) est donc directement proportionnel à la charge du véhicule. Le système de soupape réagit à ce niveau de pression pour communiquer la pression à la commande (26) contrôlant l'essieu soulevable (20) lorsque la pression dans les coussins pneumatiques (40) de l'essieu arrière non soulevable atteint un seuil préalablement fixé. L'essieu soulevable (20) réagit à cette augmentation de la pression et se détend en position porteuse de charge en contact avec la route.
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