Transmissions are gearboxes that transmit torque from a
combustion engine to the rest of the drivetrain at a desired
speed. These examples demonstrate building, using, and
A 2.0-liter, four-cylinder, naturally aspirated, spark-ignited, four-stroke engine which computes crank-angle-resolved instantaneous torque.
A four-speed transmission with two planetary gears and five clutches. The test sequence steps through the four forward gear ratios, switches to neutral, and then applies a brake clutch to the output shaft of the transmission.
A five-speed transmission with a reverse gear. An engine spins the layshaft and the six sets of output gears. To engage the selected gear, ideal actuators move the selector levers connected to the double-sided synchronizers. The position of the selector levers determines which gears are connected to the output shaft.
A fixed helicopter transmission testbed. The gasoline engine provides power that is sent to the main and tail rotors through planetary gearsets. The main rotor shaft is considered rigid, and flexibility is modeled in the longer, thinner tail rotor shaft. Blade pitch angle is set directly via a physical signal. Swash plate dynamics can be added using the appropriate blocks in Simscape™ Fluids™. The engine stalls after six seconds, but lift is maintained for some time through the unidirectional clutch. This scheme also allows autorotation of the main rotor in a descending helicopter.
A test harness for a Ravigneaux 4-speed transmission. The subsystem uses the Ravigneaux Gear block and five friction clutches to implement four forward ratios plus reverse. Meshing losses are enabled in the Ravigneaux gear. The clutch states required to implement the different ratios can be viewed by opening the Clutch Schedule block.
A Simpson transmission with three forward speeds and one reverse speed. Two planetary gear sets are linked with a common sun gear. Two disk friction clutches and two band brakes determine which components can rotate relative to one another which determines the final gear ratio. The Clutch Schedule subsystem shows which clutches and brakes should be locked for each forward or reverse speed.
A testbed with interchangeable transmissions. The transmission models vary from classic four speed transmissions to modern seven, eight, nine, and ten speed configurations. The efficiency and drive ratio can be adjusted by varying the components in each individual transmission configuration. The transmission choices are held in a variant subsystem and are selected by either using the hyperlinks in the model or right-clicking the Transmission subsystem, selecting Variant -> Override using, and the desired variant.
A simple two-speed transmission. Two clutches control which gear is selected. A brake is connected to the output shaft and can be controlled independently.
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