ContiTech AG Conventional Engine and Transmission Mounts Engine Suspension

Conventional rubber-to-metal bonded and rubber-to-plastic bonded engine and transmission mounts for cars and trucks.

• Fixing of the engine
• Absorption of static loads
• Isolation of structure-borne vibration
• Absorption of engine – torque
• Limitation of unit motion
• Damping of roadway-related vibration and excitation
• Crash-protection of power unit

Innovative engine mount technologies are needed to meet the high comfort expectations of future vehicles. ContiTech is working on solutions in the form of active systems for noise and vibration control. Ongoing projects focus on the development of actuators and control systems for active engine mounts and active absorbers.

At the core of the active system there is an electronic control device on which the control algorithms can be implemented. The active system boasts the following characteristics:

• Compensation of stochastic and deterministic (periodic) excitation
• Effectiveness across a wide frequency range (20 - 400+ Hz)
• Automatic tuning function
• Possibility of triggering several actuators for the suppression of vibration at various positions

Possibility, for instance, of compensating the vibrations introduced into the chassis via the engine mount (by using an active absorber system).

This can contribute to an improvement in riding comfort in cars with three-cylinder engines or vehicles with cylinder deactivation.

As components connecting the engine with the body, hydromounts have to fulfill a number of different tasks. They have to firmly fix the engine in position, absorb drive and braking torque, isolate and dampen engine vibration (damping-effect-generating hydraulics). Hydromounts make possible amplitude-/frequency-selective damping.

Hydro bushings have the same job to do as hydromounts, namely that of isolating and damping vehicle vibration. Hydro bushings have an especially compact design. The parts are so cleverly designed geometrically that one component can assume functions divided up among a number of different components in the hydromount.

Conventional hydromounts represent a compromise when it comes to good isolation and good damping. There is an advantage in adapting the characteristics of mounting components to the respective driving conditions. This is realized with adaptive hydromounts.

• Hydromounts with on/off damping
• Hydromounts with on/off stiffness characteristic

The stiffness characteristics and damping behavior of adaptive hydromounts can be altered. For the sake of optimum isolation, hydraulic damping can, for example, be switched off when the engine is in idle. The damping function is switched on during driving to improve the vehicle's ability to deal with shaking.

In classic absorber design without fluid, or filled with fluid as so-called hydraulic absorbers, they reduce structure-borne vibration caused by resonances occurring in the engine mount system.

The elastomer spring is generally where the damping characteristics of absorbers are adjusted. The use of an integrated fluid system opens up new possibilities for adjusting the component. Key support spring characteristics can be optimized independent of damping characteristics. The modular system from ContiTech Vibration Control has an impressively simple design and integrated protection against breakaway, It is thus suitable for universal vehicle application.