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Drivetrain DesignThe two methods listed above are critical for drivetrain design. A good designer will not only gear arobot such that it moves at the desired speed but will also ensure that there is not excessive loadingon the motors.More Information on TransmissionsUsing different combinations of gear ratios and the principle of mechanical advantage, transmissionsprovide a torque increase and speed reduction from the high speed and low torque supplied by thedriving motor or engine.Transmissions are used in practically every industry that uses machinery. They are sometimes used instationary applications to move or lift heavy loads, but are more easily recognized and appreciated invehicles to direct power to make them move. They not only transmit power out of the engine, butmore simplistic gearboxes redirect the power out to the wheels. In addition to geared transmissions,heavy construction and agricultural equipment sometimes utilize hydrostatic and electric drives.Hydrostatic drives utilize fluids pumped through hoses to drive components instead of heavyspinning driveshafts and mechanical connections. Electric drives use direct-driven systems in whichthe motors are actually mounted at the location where the power is needed. Electricity is sent from thepower source to the motors through wires, eliminating the need for mechanical power transfer.Gearboxes are the simplest form of a transmission. Transmissions do just what their name implies:they transmit torque and speed. Gearboxes are different from the multi-speed or shiftabletransmissions most people think of when they hear the term, because their gear ratio is fixed when itis assembled. A gearbox is incapable of shifting, which means that its gear ratio cannot be changedwhile it is operating.Gearboxes are found in a wide variety of different applications. They were first used in windmills, grainmills, and steam engines. They sometimes supported a 90-degree change in the direction of rotationand occasionally had multiple output shafts to run several different machines at the same time. Theywere particularly desirable in operations where a large speed reduction and torque increase wereneeded in lifting loads and pumping liquids. You could say that gearboxes were perfected down onthe farm.Low gear ratios provide lots of torque with little speed, while higher gear ratios provide speed withlittle torque.10■Unit 10: Drivetrain Design 2
Create PhaseOverviewIn this phase, you learn about creating a gearbox with bevel gears. You use the Bevel Gears Generatoroption of Design Accelerator.ObjectivesAfter completing this lesson, you will be able to:■■Describe options for bevel gear generation.Build a gearbox using bevel gears.Prerequisites and ResourcesBefore starting this phase, you must have:■■■A working knowledge of the Windows operating system.Completed Unit 1: Introduction to <strong>VEX</strong> and <strong>Robotics</strong> > Getting Started with Autodesk Inventor.Completed Unit 2: Introduction to Autodesk Inventor > Quick Start for Autodesk Inventor.Create Phase■11
Page 1: 10:Unit10Drivetrain Design 2 UnitIn
Page 4 and 5: PhaseCreateBuildStandardScience (NS
Page 6 and 7: Think PhaseOverviewThis phase descr
Page 8 and 9: Let’s say we have a 5 inch diamet
Page 12 and 13: Technical OverviewThe following Aut
Page 14 and 15: Bevel Gear OptionsThe following opt
Page 16 and 17: Create the Bevel GearsIn this secti
Page 18 and 19: 5. Press E to start the Extrude too
Page 20: Reduce the Weight of the GearIn thi
Page 23 and 24: 16. Click Circular Pattern.17. To c
Page 25 and 26: ActivityIn this activity, you desig
Page 27 and 28: Amaze PhaseOverviewIn this phase, y
Page 29 and 30: STEM ConnectionsBackgroundA pitchin

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