20 Nov Engine Mount

An engine mount is a part that holds the engine in your car. In a typical car, the engine and transmission are bolted together and held in place by three or four mounts. The mount that holds the transmission is called the transmission mount, others are referred to as engine mounts. One part of an engine mount is bolted to the car body or frame. Another part holds the engine. An engine is a source of vibration, as it has many moving and rotating parts. The job of an engine mount is not only to hold the engine in place but to reduce the engine vibration felt inside the car. Engine mounts are made with a rubber material so that there is no direct metal-to-metal contact between the engine and the car body. An engine mount doesn’t need any maintenance or regular servicing. It only needs to be replaced when it fails or wears out. Engine mounts are made with a rubber material so that there is no direct metal-to-metal contact between the engine and the car body. An engine mount doesn’t need any maintenance or regular servicing. It only needs to be replaced when it fails or wears out.

Three different types of engine mount systems are listed below:

Elastomeric Mounts:

Elastomeric mounts, which are made of rubber, have been used to isolate engines since the 1930s. A lot of changes have been made over the years to improve the performance of the elastomeric mounts. For proper vibration isolation, elastomeric mounts are designed for the necessary elastic stiffness rate characteristics in all directions. They are maintenance free, cost-effective and compact. Three types of hydraulic mounts are in use these days and these are hydraulic mount with the simple orifice, hydraulic mount with inertia track, and hydraulic mount with inertia track and decoupler. Although there are differences between orifice and inertia track mounts, all of them cause damping at low-frequency ranges. These mounts can be tuned to have high damping at the shock excitation frequency which is used to reduce the vibration levels. The dynamic stiffness of these mounts is usually higher than that of the elastomeric mount spies a broad array of design requirements.

Passive Hydraulic Mounts:

Three types of hydraulic mounts are in use these days and these are hydraulic mount with the simple orifice, hydraulic mount with inertia track, and hydraulic mount with inertia track and decoupler. Although there are differences between orifice and inertia track mounts, all of them cause damping at low-frequency ranges. These mounts can be tuned to have high damping at the shock excitation frequency which is used to reduce the vibration levels. The dynamic stiffness of these mounts is usually higher than that of the elastomeric mounts.

Active Engine Mount :

Inactive vibration control, a counteracting dynamic force is created by one or more actuators in order to suppress the transmission of the system disturbance force. A general active mount consists of a passive mount (elastomeric or hydraulic), force generating actuator, a structural vibration sensor, and an electronic controller. The passive mount is used to support the structure in case of an actuator failure. The controller can either be feedback or feed forward. The vibration control is implemented with a closed loop controller that utilizes the sensor measurement. The mechanical models of elastomeric and hydraulic active mounts. The active mount stiffness is equivalent to the stiffness of the passive mount (elastomeric or hydraulic).