Dongfeng LoongGine engine parts Torsional vibration damper assembly 10BF11-05060

Built to mitigate torsional vibration of the crankshaft—critical for engine durability—this assembly adopts an advanced dual-mass structure. The primary mass (high-strength cast iron) connects directly to the crankshaft, while the secondary mass (aluminum alloy) is linked via a high-elasticity rubber ring. The rubber ring (hydrogenated nitrile rubber, HNBR) absorbs 85% of crankshaft torsional vibration (frequency range 50-500Hz), reducing vibration amplitude from 3° to 0.5°. This minimizes stress on the crankshaft (reduced by 60%) and avoids resonance with other engine components, preventing fatigue cracking of the crankshaft and extending its service life by 40%

Engineered to endure the high rotational speeds and dynamic loads of heavy-duty engines, the damper features a robust construction. The primary mass is made of nodular cast iron (QT600-3) with a tensile strength of 600MPa, resisting centrifugal force at the crankshaft’s maximum speed (2500rpm). The secondary mass uses 6061-T6 aluminum alloy, balancing lightweight (reducing rotational inertia by 20%) and rigidity. The HNBR rubber ring exhibits a Shore hardness of 85±5 and excellent fatigue resistance, enduring 100 million vibration cycles without cracking. A stainless steel retaining ring secures the dual masses, preventing separation even under extreme load conditions (e.g., sudden acceleration or deceleration)

Designed to adapt to the harsh environment of the engine front end, the damper integrates multiple protective features. The HNBR rubber ring operates stably at temperatures ranging from -40℃ to 150℃, resisting degradation from engine heat and oil splashes. The primary and secondary masses undergo shot blasting and electrophoretic coating (60μm thickness), passing 1200-hour neutral salt spray testing (ASTM B117) to prevent rust and corrosion from road salt or moisture. The damper’s surface is coated with a heat-dissipating paint, reducing temperature rise by 15℃ during high-speed operation, further protecting the rubber damping element from thermal aging

The torsional vibration damper directly contributes to optimizing engine performance and reducing maintenance costs. By reducing crankshaft vibration, it improves the accuracy of the timing system (camshaft, fuel injection pump), enhancing combustion efficiency and reducing fuel consumption by 3-5%. The reduced vibration also minimizes wear on the crankshaft bearings and piston connecting rods, cutting engine overhaul costs by 50%. Installation is simplified via the 10-keyway connection, which ensures precise alignment with the crankshaft—reducing replacement time by 30% compared to non-OE dampers. Backed by a 2-year/250,000km warranty, it provides reliable support for heavy-duty operations, minimizing unplanned downtime