Establishing Flex Plate optimization using hybrid technique for SUV Automatic transmission 2020-01-0916
For Automatic transmission application, crankshaft torque is transferred to torque converter through flex plate. As the flex plate design has no functionality of storing energy as in case of MT flywheel, flex plate design can be optimized to great extent.
Flex plate structure must have compliance to allow the axial deformation of torque convertor due to ballooning pressure generated inside the converter. Flex plate experiences dynamic torque and centrifugal forces due to high rotational speed. It should have compliance to accommodate the assembly misalignments with torque convertor in both axial and radial directions.
In this paper, hybrid optimization technique is described used to optimize the flex plate design with stress, stiffness and mass as design criteria. The load path, corrugation length and axial stiffness of flex plate captured accurately using this hybrid optimization. The variation of shape, size, orientation and number of holes are based on the load path and axial stiffness of flex plate. The results show that 35 % of weight reduction is achieved with original design and it meets all design requirements in product development.