Patent ID: 8998187
Filing Date: 2015-04-07
Classification: F16F,Y10T

Abstract:
1. A multistage switchable inertia track assembly comprising: a housing; an inertia track received in the housing and having an elongated fluid damped first path that is adapted to communicate with an associated first fluid chamber on a first side and an associated second fluid chamber on a second side, and a second path that communicates with the associated first and second fluid chambers, the first side of the inertia track forming a portion of the first fluid chamber, and the second side of the inertia track forming a portion of the second fluid chamber; a decoupler received in the housing between the first and second fluid chambers; an idle diaphragm in the housing that has a first surface that forms a part of the second fluid chamber and selectively controls communication between the first and second fluid chambers to selectively alter the damping; and first and second ports in the inertia track that separately communicate with the decoupler and with a second surface of the idle diaphragm, respectively, the first and second ports configured to be selectively connected to vacuum or no vacuum such that the assembly is configured to be operated in four modes, comprising: in a first mode the first and second ports are connected to vacuum so that the decoupler no longer oscillates and the idle diaphragm opens the second path through the inertia track, in a second mode no vacuum is applied to either the first port or the second port so that the decoupler freely oscillates and the idle diaphragm closes the second path through the inertia track whereby fluid must flow from the first chamber to the second chamber through the first path, in a third mode vacuum is applied to the first port only and not to the second port so that the idle diaphragm closes the second path through the inertia track and fluid from the first chamber to the second chamber must pass through the first path, and in a fourth mode vacuum is applied to the second port only and not to the first port so that the decoupler oscillates freely for a first predetermined displacement input but fluid will flow through the open second path through the inertia track.