BSE 2484 Lab # 24/25 (TC, Differentials & Final Drives) STATION # 1(Torque Converter) •Torque Converters – are fluid coupling devices: –Functions as a clutch– couples and uncouples the engine from the gear train –Functions as a torque multiplier– improves acceleration and/or pulling power •Torque converters operate by generating and directing hydraulic force (fluid in motion and under pressure) between the engine and power train •When high velocity fluid strikes a turbine the turbine will move and torque is transmitted •The greater the velocity of the fluid the greater the torque transmitted to the turbine •However at low velocity little to no torque is transmitted to the turbine •So the velocity of the fluid controls the engagement of the coupling between the engine and gear train and the amount of torque transmitted •There are two types of fluid (oil) flow in a torque converter: •Vortex Flow– circular flow of oil from impeller to turbine (resulting from centrifugal force) •Rotary Flow– around the impeller and turbine •The action of these two oil flows will transmit torque but not increase it •Increasing torque is where the stator comes into play •Oil enters the turbine at it’s outside perimeter and exits at it’s inside perimeter •Oil enters the impeller at it’s inside perimeter and exits it’s outer perimeter •When stationary the stator redirects the oil so that it flows smoothly into the impeller •Because the oil passages on the turbine are smaller at the center than at the out side oil velocity is increased •This high velocity oil hits the curved vanes of the stator which acts like a lever redirecting the oil into the impeller in the direction of rotation and increasing torque Name each numbered torque converter component at this station: Component # 1, 2, 3 and 4 Blank # 1Which components are input members (driven by the engine?) Blank # 2Which component is the output member (drives the transmission?) Blank # 3
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