Vacuum switchable hydromount

  • 30-Sep-2009 04:19 EDT
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Trelleborg Automotive's hydromount with vacuum-switchable bypass offers performance and durability, according to the company. The device consists of a main channel between two hydraulic chambers to dampen road shake, a switchable decoupler for improved engine vibration isolation during driving, and a switchable secondary channel (the bypass) for optimum idle isolation. During engine idling, Trelleborg’s solution opens the bypass and restricts decoupler motion to provide isolation in the main engine excitation frequency range. When driving, the mount switches the decoupler back on for better isolation of high-rpm engine vibrations, simultaneously closing the bypass for comfortable road-shake damping. The vacuum-switchable hydromount fulfills the conflicting requirement of having enough damping to mitigate powertrain shake and provide comfort, while being soft enough to ensure isolation during engine idling. Developed in accordance to BMW’s specific criteria, the mount is already in use on the BMW 5, 6, and 7 Series diesel vehicles.

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