tailieunhanh - Automatic Transmissions P13

Glossary of terms | Appendix A GLOSSARY OF TERMS A Accumulator Used in transmission hydraulic systems to control shift quality. Absorbs the shock of pressure surges within a hydraulic circuit. Axis The center line around which a gear or shaft rotates. C Cam-Cut Drum A one-way roller clutch drum whose inner surface is machined with a series of ramped grooves into which rollers are wedged. Centrifugal Force The tendency of objects to move away from the center of rotation when rotated. Clutch Pack The assembly of clutch discs and steel plates that provides the frictional surfaces in a multiplate clutch or brake. Cut-Back Pressure Modulated throttle pressure controlled by governor pressure and is used to reduce throttle pressure. Reduced throttle pressure results in a reduction of line pressure. Coupling Range The range of torque converter operation when there is no torque multiplication and the stator rotates with the impeller and turbine at nearly the same speed. D Differential The assembly of a carrier pinion gears and side gears that allows the drive axles to rotate at different speeds as a vehicle turns a corner. Direct Drive A one to one 1 1 gear ratio in which the input shaft and output shaft rotate at the same speed. E Endplay The total amount of axial fore and aft movement in a shaft. F G Flexplate The thin metal plate used in place of the flywheel that connects the engine crankshaft to the torque converter. Gear Ratio The number of turns made by a drive gear compared to the number of turns by the driven gear. Computed by the number of driven gear teeth divided by the number of drive gear teeth. Gear Reduction A condition when the drive gear rotates faster than the driven gear. Speed is reduced but torque is increased. Governor Pressure Modified line pressure that is directly related to vehicle speed. Governor pressure increases as vehicle speed increases and is one of the principle pressures used to control shift points. Automatic Transmissions - Course 262 193 APPENDIX A H .