Flywheels

Flywheels are engineered to absorb cyclic torsional inputs from reciprocating masses, helping to reduce angular displacement fluctuations along the crankshaft. This damping effect is essential for maintaining smooth engine operation and minimizing vibration.

Flywheel Type

Solid / Dual-Mass / Lightweight Performance

Material Specification

Cast Iron (GGG60) / Billet Steel (4340) / Aluminum (7075-T6 for racing)

Outer Diameter

250–400 mm (±0.2 mm tolerance)

Clutch Facing Diameter

200–350 mm (±0.1 mm; surface finish 0.8–1.6 μm Ra)

Crankshaft Bolt Pattern

6–8 bolts (M10–M12); SAE or Metric patterns (e.g., 6x 10.5mm PCD)

Product Description

If unmanaged, torsional harmonics can travel through the powertrain and cause fatigue cracking at fillets and journal transitions. To counter this, flywheels are specified with a mass moment of inertia precisely matched to the engine’s firing interval, bore/stroke ratio, and cylinder count.

Clutch Cover Bolt Pattern

6–9 bolts (M8–M10); Matched to clutch type

Ring Gear Specification

110–150 teeth (module 2.0–3.5); Hardened steel (HRC 50–55)

Weight

8–25 kg (OEM cast iron) / 5–12 kg (performance steel/aluminum)

Balancing Specification

ISO 1940-1 G6.3 (OEM) / G2.5 (performance); ≤1g imbalance at RPM

Certification Standards

ISO 9001:2015, IATF 16949, SAE J1809 (clutch system standards)

Technical Advantages

Flywheels contribute to the uniformity of crankshaft angular velocity during engine idling, especially under asymmetric firing conditions or cold-start scenarios. Low-speed torque delivery in naturally aspirated or emission-restricted engines is prone to high fluctuations, resulting in RPM instability. Flywheels with calibrated inertia values are modeled using time-domain simulations to suppress transient angular acceleration. These flywheels reduce the likelihood of stalling and enable smoother clutch engagement by maintaining rotational momentum through incomplete combustion cycles. 

Flywheels function as the primary mechanical interface between the crankshaft, clutch system, and transmission input. Any deviation in face flatness, bolt circle true position, or pilot concentricity introduces parasitic loads, resulting in premature spline fretting and input shaft misalignment. Each flywheel is machined with parallelism under 10 microns, axial runout less than 0.05 mm, and hub bore tolerances within H7/k6 fits depending on the application. These tolerance parameters are maintained across production batches using real-time CMM verification. 

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Industry Applications

Automotive Internal Combustion Engines

Flywheels stabilize crankshaft rotation, damp torsional vibrations, and support clutch engagement in gasoline and diesel engine drivetrains.

Hybrid Electric Powertrains

Flywheels store kinetic energy during regenerative braking and release it to provide torque assist, thereby reducing the transient load on batteries. 

Heavy Commercial Vehicles

Flywheels provide inertial support under low-speed high-load conditions, improving torque delivery and reducing engine stalling during launch. 

Agricultural Tractors and Equipment

Flywheels absorb irregular combustion pulses in low-RPM diesel engines, enhancing drivetrain smoothness during variable mechanical loading. 

Power Backup Systems (Diesel Gensets)

Flywheels maintain rotational inertia during generator startup and load switching, reducing voltage fluctuations in critical power supply systems. 

Marine Propulsion Engines

Flywheels dampen crankshaft torsional vibrations caused by uneven cylinder firing, protecting gearboxes and propeller shafts from fatigue. 

 

Flywheels

Thermomechanical Stability Under Cyclic Heat Flux

Flywheels operating in high-friction or rapid-shift environments experience localized heating from clutch engagement, resulting in radial thermal gradients. This leads to residual tensile stress and crack initiation if materials and processes are not controlled. 

Flywheels in hybrid electric powertrains serve both kinetic energy retention and damping functions during regenerative braking and motor assist. These flywheels are subjected to high rotational velocities (>12,000 RPM) and require optimized polar inertia with low windage losses. 

Flywheels

Having Doubts? Our FAQ

Check all our Frequently Asked Question

How does Frigate ensure flywheel torsional vibration damping meets engine requirements?

Frigate uses advanced finite element analysis combined with torsional vibration modeling tailored to each engine’s firing order and load profile. This allows precise calculation of flywheel inertia and damping characteristics. Manufacturing follows strict mass distribution protocols to achieve targeted vibration attenuation. Final products are dynamically balanced and tested to ensure compliance with vibration reduction standards.

What quality controls does Frigate apply to maintain flywheel mounting surface precision?

Frigate implements CNC machining centers equipped with in-process coordinate measuring machines (CMMs) to continuously monitor flatness and runout. Surface tolerances are maintained within 10 microns flatness and 0.05 mm axial runout. This ensures perfect interface fit with clutch assemblies and transmissions. Batch traceability allows quick identification and correction of any deviations. 

How does Frigate select materials to enhance flywheel thermal fatigue resistance?

Frigate evaluates material properties such as thermal conductivity, expansion coefficient, and fatigue limit before finalizing the alloy. Ductile iron and quenched-tempered steels are commonly chosen for their ability to withstand cyclic thermal stresses during clutch engagement. Post-machining stress-relief heat treatments reduce residual stress accumulation. Material compatibility with friction linings is also verified to prevent surface degradation.

What dynamic balancing techniques does Frigate use for high-speed flywheels?

Frigate uses dual-plane dynamic balancing machines equipped with vector correction to achieve mass distribution accuracy within ±2 grams. Balancing is performed at service RPM to simulate real operational conditions. This reduces vibration and extends the service life of flywheels in demanding applications. Each unit undergoes validation through gyroscopic inertia testing and recorded for traceability.

How does Frigate design flywheels for hybrid vehicle regenerative braking systems?

Frigate integrates lightweight composite materials with metallic hubs to optimize rotational inertia while minimizing mass. Flywheels are engineered to sustain rotational speeds exceeding 12,000 RPM with minimal windage losses. Magnetic coupling designs enable efficient torque transfer between electric motor-generators and flywheels. Bearings with ceramic hybrids reduce friction and thermal buildup during bidirectional rotation cycles.

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LOCATIONS

Global Sales Office

818, Preakness lane, Coppell, Texas, USA – 75019

Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

Operations Office

9/1, Poonthottam Nagar, Ramanandha Nagar, Saravanampatti, Coimbatore-641035, Tamil Nadu, India. ㅤ

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Flywheels

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