An engine mounting performs two jobs at once. It holds the engine securely to the chassis under braking, acceleration, cornering, and shock loads, and it isolates the chassis (and the passenger cabin) from the engine's own vibration. The rubber element absorbs and dissipates vibration; the bonded metal inserts provide the mechanical interface to the engine block on one side and the chassis frame on the other.
The three properties that matter
- Stiffness: how much the mount deflects under load. A mount that's too soft lets the engine move excessively under torque; one that's too stiff transmits vibration directly to the cabin.
- Damping: how much vibration energy gets converted to heat instead of being transmitted to the chassis. This is what the rubber compound's hysteresis does for you.
- Durability: how long those properties hold up through years of heat, oil exposure, cyclic loading, and ozone.
Tuning these three to a specific vehicle program is what mount-design engineering work is about. The compound, the geometry, and the bonded metal layout all play.
Material choices
| Compound | Typical use |
|---|---|
| NR (natural rubber) | High-resilience mounts where oil exposure is minimal |
| NBR (nitrile) | Mounts with potential oil contact |
| EPDM | Mounts where ozone and weather resistance matter |
| CR (neoprene) | Balanced oil and weather performance |
Hardness typically falls in the Shore A 45–70 range, depending on the load case.
NVH: noise, vibration, harshness
NVH is the umbrella term for the unwanted sounds and vibrations a driver feels through the steering wheel, the seat, and the pedals. Engine mounts are a primary NVH lever, alongside body bushings, exhaust hangers, and chassis isolators. Bad mount design or worn mounts shows up as a buzz at idle, harshness on uneven roads, or a vibration that builds at a specific RPM. Good mount design eliminates those signatures across the engine's entire operating range.
Why bonded matters
A modern engine mount is almost always a rubber-to-metal bonded assembly. The rubber is chemically and mechanically locked to the bracket during the molding cure. Done right, the rubber tears before the bond fails. At PBR we pull-test adhesion on every batch, the same discipline that earned the Hino Best Supplier 2009 recognition. See more on our bonding capability, or browse the full Metal & Rubber Parts range.
Custom mounts from drawing or sample
If you have an engine-mount program (passenger car, light commercial, truck, two-wheeler, or industrial engine) we can quote from a 2D or 3D drawing, from a physical sample, or from a concept description. Tooling is CNC-milled in-house, typical lead time 3 to 6 weeks. Email marketingoem@pbrubberindo.co.id with your specs.