Hydraulic chassis bushings have been a standard component in passenger vehicle chassis for many years and feature an integrated damper system which increases driving comfort. Until now, the stoppers of these delicate bushings were not robust enough to cope with the substantial loads of a heavy SUV. Conventional stopper concepts made of rubber can handle loads approximately in line with the single weight of the vehicle without any noises being caused. Even stopper systems with high performance plastic stoppers can only support loads of up to twice the weight of the vehicle, and this is still insufficient for them to be used in heavy SUVs. TrelleborgVibracoustic therefore developed hydrobushings for maximum loads. The key component of this innovation is a special hybrid stopper made of aluminum and high-performance plastics that can take loads of up to approximately ten tons. Such extreme loads can occur at high speeds, for example if braking tires hit a pothole or the vehicle drives over road bumps.
Chassis bushings need low spring rates in order to achieve good structure-borne sound isolation. Soft bushings need highly progressive stoppers in order to limit suspension travel in the event of peak forces. Rubber bushings with a hydraulic damping system are increasingly used to dampen vibrations that are transferred to the bodywork via the wheels. Hydro bushings optimally dampen vibrations that occur thanks to their special construction. They contain a hydraulic medium which is able to move freely within two chambers in the bushing. When the hydrobush is set in motion, the fluid flows into the mount’s interior via precisely defined channels. The flow resistance generated by this dampens the vibrations introduced from outside.
TrelleborgVibracoustic is the leading provider of anti-vibration solutions for the global automotive and commercial vehicle industries. Founded as a joint venture by Freudenberg and Trelleborg in 2012, the company generated sales of approximately 1.7 billion Euro in 2013. TrelleborgVibracoustic has around 10,000 employees at 38 locations in 18 countries who develop and produce driveline and chassis components for anti-vibration control. For more information, see www.tbvc.com.