Abstract: The mount preferably includes a decoupler assembly that causes different degrees of damping of relatively large magnitude excitation forces that result in mount compression versus mount extension, and that causes no or only minimal damping of excitation forces of relatively small amplitude. In a preferred embodiment the mount includes a generally cylindrical double-walled housing having a central portion containing at least part of a first variable volume chamber containing hydraulic fluid, and having an outer portion containing a second variable volume chamber containing gaseous fluid. The second chamber is of annular shape and encircles at least part of the first chamber. A rolling diaphragm defining a boundary of at least one of the chambers is formed of elastomeric material having a layer of reinforcing material preferably disposed at an offset location therein.

Abstract: The invention relates primarily to fluid suspension systems for truck cabs which are required to tilt on the chassis in order to gain access to the engine. In order to provide cab tilt pivots the displacer units comprise pins which engage in recesses when the units are retracted and tilting means is arranged in relation to the cab and the chassis such that the pins are not displaced from the recesses when the tilting means is operated.

Abstract: The invention provides a hydropneumatic suspension system which is particularly suitable for lorry cabs of the kind which require to be tilted about a horizontal axis for access to the engine. Such a system normally has the disadvantage that a hydropneumatic unit, incorporating a diaphragm does not provide a firm pivot anchorage for the cab tilting system.The invention overcomes this problem by pivotally attaching one portion of the displacer unit, below the diaphragm, to a downwardly extending formation of the cab and arranging for abutment between the formation and the displacer unit portion above the tilt axis to maintain the displacer unit portions in alignment when the cab is in the ride position.