Engine mounts are one of the most important parts in a vehicle or industrial equipment. They can be found in airplanes, cars, trains, boats, trucks, buses, tractors and any other vehicle or equipment that uses a motor or engine. Have you ever thought about what keeps your engine in place in your vehicle? The answer is engine mounts. These small parts are imperative to the proper and safe function of any moving machine. 

Continue reading to learn more about engine mounts and how they work.

Engine Mount Form

Engine mounts can be of various designs or form depending on the application and amount of energy they need to absorb.  Because of this, most mounts are relatively small or just large enough dampen and absorb the energy without taking up too much space. There are a few parts that go into an engine mount. One of these is the molded rubber bushing or mount which acts as the vibration control and cushion. The engine will typically be attached directly to this part. There will also be a bolt that goes through the length of the motor mount, which is used to secure it.  The purpose is to make sure there is a rubber break between the two mating surfaces. Some motor mounts have a metal cover over the rubber part to provide more stability.

Engine mounts are made in a variety of shapes. They can be large, with multiple mounts connected to a frame. Some are also made with hydraulic fluid on the inside to provide more damping and flexibility to help avoid a broken motor mount. The shape, size and materials of an engine mount depends on how much load is applied to the mount and how much energy the mount needs to absorb or dampen from transmitting to the support frame.

The Function of an Engine Mount

two-piece mounts_EM-1The function of an engine mount depends on the vehicle that it is needed for. Here are the four most common types of engine mounts:

Single piece isolator:  These can be used as the front or rear mounts of an engine set.   They tend to be best suited for stationary applications (Gen Sets, In plant power, etc) as there is only an elastomer on the top portion of the mount. 
 
Hydraulic Engine Mount: mounts with hydraulic fluid absorb more noise and engine vibration. The internal fluid is “pushed” through internal orifices to provide a controlled spring rate. These are most common in vehicles with four cylinders or more, such as large trucks and buses. 

Two-Piece Mounts:  These are great for applications that have high rebound load cases - such as off-road equipment. Think of the need to isolate in both directions.

Base plate for flange mounts. These are for applications where ease of installation is required. These mounts have a base flange that can easily be fixed to a floor or base structure with bolts. No need to recess or insert into a frame. These are commonly used in applications where there is plenty of space to accommodate a mount.

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