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Shifting Gears Blog
21-Aug-19

Clutch Groove Fluid Flow Dynamics & SAE Testing: HT

Clutch Groove Fluid Flow Dynamics & SAE Testing: HT

Raybestos Powertrain has combined the superior fluid flow dynamics of our unique HT groove pattern design with a proprietary, high-energy friction material. See how the use of fluid flow dynamics and SAE testing allow us to develop the perfect friction clutch plate OE replacement for passenger vehicles.By using premium friction technology such as fluid flow dynamics and SAE testing, the result is the HT friction clutch plate that provides smoother shifts, increased torque capacity, reduced drag torque, and increased durability. Groove pattern or design will dictate the fluid flow dynamics at the clutch surface, both when the clutch is applied as well as when it is released. This means that fluid flow dynamics are essential when designing a friction plate to maximize performance and durability, and to help improve fuel economy. The design of a friction plate groove pattern must address three needs:1. Adequate lubrication (See Chart)2. Reduced temperatures (See Chart)3. Reduced drag torque (See Chart)Optimum groove design results in the ideal balance of adequate lubrication, reduced temperature and reduced drag torque.Adequate LubricationFluid must move properly along the clutch surface in order to lubricate the steel reaction plates. When fluid flows quickly through the groove, it provides less cooling, but better lubrication. These plates usually have a radial, waffle or other type of straight-line friction groove pattern.Reduced TemperaturesWhen fluid flows more slowly through the groove, it absorbs more heat, which provides more effective cooling. Ideally, the pattern will also promote a swirl of the oil as it flows through the groove, which improves cooling even more. These plates usually have a groove pattern that is not a straight-line design.Reduced Drag TorqueDrag torque has a direct impact on fuel efficiency. An engineered balance between oil flow, groove design and clutch clearance is needed to keep the friction and steel plates separated while disengaged, yet not to permit so much oil to flow between the plates that the parasitic drag greatly reduces fuel efficiency.Durability Test - SAE J2489Test Cycles SurvivedUsing precise SAE machines, our experts were able to evaluate clutch performance by using torque trace. One vital test is the E/M (Endpoint/Midpoint) ratio. The closer the E/M ratio is to 1:1, the better the shift.Friction Co-efficient – SAE J2487Performance Comparison (Over life of test)To view full list of available applications, visit http://www.raybestospowertrain.com/catalogsTo find a distributor of Raybestos Powertrain HT friction clutch plates near you, visit http://www.raybestospowertrain.com/where-to-buy

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