ASE Certification-Manual transmissions

How do gear sets create mechanical advantage? - ANSWER-They do so by having different ratios. Gears with the same number of teeth have a ratio of 1:1, meaning that this set of gears have no mechanical advantage. They turn at the same speed because of the same number of teeth. Drive gear - ANSWER-the input gear Driven gear - ANSWER-the output gear Gear ratios can be found by comparing the number of teeth each gear has. - ANSWER-If the drive gear has fewer teeth than the driven gear than the gear set will have mechanical advantage. The smaller drive gear has to rotate faster than the larger driven gear, given an increase in output force. All gear ratios are calculated by the formula: - ANSWER-driven/drive What is overdrive? - ANSWER-The output gear would be turning faster than the input gear. Ex.(0.8:1) As the gear ratio decreases the... - ANSWER-the output speed increases. This is what happens inside a transmission whenever the driver selects a higher gear. A lower gear has a... - ANSWER-Higher gear ratio. Speed and torque output is the result of the... - ANSWER-selected gear ratio. Recommended shifting speed guidelines will ensure what? - ANSWER-Good fuel economy. Power flow - ANSWER-is defined as the path in which power is transmitted through a series of components. Power flows through what? - ANSWER-The entire drivetrain What is the typical main source of mechanical power in the vehicle? - ANSWER-The engine. The power that the engine creates flows from... - ANSWER-the crankshaft to the flywheel and to the clutch assembly. When the clutch pedal is released... - ANSWER-the clutch transmits power from the flywheel to the input shaft of the transmission/transaxle.