Student Assignments for EM-1100_053254 Planetary Gear Set Trainer 95-EM-1100_REVA © ConsuLab Educatech Inc, 2025. All rights reserved. 95-EM-1100 Table of contents 400-6330 Zéphirin-Paquet St. Québec QC G2C 0M3 Canada consulab.com info@consulab.com Toll-free: +1 (800) 567-0791 USA: +1 (810) 222-4525 Canada: +1 (418) 688-9067 Fax: +1 (418) 843-3444 2 © ConsuLab Educatech Inc, 2025. All rights reserved. No part of this work may be reproduced or transmitted in any form by any means, electronic, mechanical, including photocopying and recording, or by any information storage or retrieval system, without written permission from the publisher. Made in Canada. The content of this manual is applicable to models 053254 and above. Table of contents Theory Basic operation 4 Student Assignments SA-1 — Component Identification 6 SA-2 — Power Transfer 7 SA-3 — Calculation of Gear Ratios 10 SA-4 — Compound Gear Ratios 14 SA-5 — Understanding and Calculating Ratios of an Allison 1000 Transmission (Advanced) 16 SA-6 — Understanding SIMPSON (2th speed) compound planetary gear ratios of an Allison 1000 Series transmission (Advanced) 19 SA-6 — Understanding SIMPSON (2th speed) compound planetary gear ratios of an Allison 1000 Series transmission (Advanced) — Student Answer Sheet 20 Quiz and Additional Questions on Planatery Gear Trains 21 Part 1 : Multiple choice questions 21 Part 2 : Additional Questions 21 Part 3 : Planetary Gears and Mathematics 22 Technical Terms Glossary 24 95-EM-1100 Theory consulab.com info@consulab.com 3 Theory consulab.com info@consulab.com 4 95-EM-1100 Basic operation Basic operation • A planetary gear train consists of three main components, each of which can serve a different function depending on how the gear set is used: - Input member: the component that is driven and supplies torque - Reaction member: the component that is held stationary or controlled - Output member: the component that delivers the resulting motion and torque • When one member of a planetary gear train is driven, the other two members are forced to rotate. By selecting which component is driven, which is held, and which is used as the output, the planetary gear train can produce multiple gear ratios, including forward gears and reverse. • To transmit torque through a planetary gear train: - One member applies a rotating torque (input), - A second member resists motion by being held stationary or controlled (reaction), - The third member rotates as a result and delivers the output torque. • Each of the three members can alternate between the roles of input, reaction, and output. The different combina- tions of these roles determine: - The number of available gear ratios - Whether the output rotates in the same or opposite direction (reverse gear) • In some applications, the reaction member is not completely stationary but is allowed to rotate in either direction under control. This creates a continuously variable gear ratio and is commonly used in hybrid vehicle transmissions. • Torque transmission within a planetary gear train occurs in several stages, beginning with the driven input member and ending with the rotation of the output member. The terms drive and driven simply describe the relationship between components transmitting motion. • For clarity, in a planetary gear train: - The drive member is referred to as the input member - The held member is referred to as the reaction member - The driven member is referred to as the output member 95-EM-1100 Student Assignments consulab.com info@consulab.com 5 Student Assignments 95-EM-1100 SA-1 — Component Identification consulab.com info@consulab.com 6 SA-1 — Component Identification Name : Group : Date : Perform all tests following the procedure below as instructed. Write your answers on this page. It includes the activity description and the answer sheet. Identifying and learning the names of planetary gear train components is crucial for understanding and effectively dis- cussing the system’s operation and advancing in student assignments. Objective : Identify and label the components of a simple planetary gear set. Material Required : ConsuLab EM-1100 Planetary gear set trainer. Procedure : 1. Inspect the planetary gear set trainer. 2. Identify the components below on the EM-1100 with the correct number : Sun gear : Planet pinions : Ring gear : Planet carrier : 3. Count the number of teeth for each of the following gears : Sun gear : Planet pinions : Ring gear : 1 2 3 4 Instructor : Grade : 95-EM-1100 SA-2 — Power Transfer consulab.com info@consulab.com 7 SA-2 — Power Transfer Name : Group : Date : Perform all tests following the procedure below as instructed. Write your answers on this page. It includes the activity description and the answer sheet. This assignment helps students understand the connections between components and learn the fundamental functions of a planetary gear set. Objective : Identify the component movements according to the 6 different blocking scenarios offered by the EM-1100 trainer. Material Required : ConsuLab EM-1100 Planetary gear set trainer. To begin with, you need to understand two concepts : input value and power output value. The input value (motor) is at the gear driven by you and the output value is at the second gear that will be moving. To generate power transfer, it is necessary to hold one of the components. When none of the components are held, there is no power transfer. There- fore, rotating a gear will not produce any output value. This scenario represents the neutral position. Procedure : In the following steps, you will experiment with the 6 power transfer scenarios available with the EM-1100. Scenario #1 : 1. Install the locking pin at the sun gear. 2. Hold the planet carrier handle and rotate three times. 3. Which gear represents the power output value ? 4. Regarding the power output gear, do we have a scenario improving torque or speed ? 5. How many turns do you get at the power output gear after three complete rotations of the planet carrier ? 6. So the input/output ratio is . A B C A : Sun Gear Locking B : Planet Carrier Locking C : Ring Gear Locking 95-EM-1100 SA-2 — Power Transfer consulab.com info@consulab.com 8 Scenario #2 : 1. Install the locking pin at the ring gear. 2. Hold the planet carrier handle and rotate 180°. 3. Which gear represents the power output value ? 4. Regarding the power output gear, do we have a scenario improving torque or speed ? 5. How many turns do we get at the output gear after a complete 180° rotation of the planet carrier ? 6. So the input/output ratio is Scenario #3 : 1. Install the locking pin at the sun gear. 2. Hold the ring gear handle and rotate four times. 3. Which gear represents the power output value ? 4. Regarding the power output gear, do we have a scenario improving torque or speed ? 5. How many turns do we get at the output gear after four rotations of the ring gear ? 6. So the input/output ratio is Scenario #4 : 1. Install the locking pin at the ring gear. 2. Hold the sun gear handle and rotate four times. 3. Which gear represents the power output value ? 4. Regarding the power output gear, do we have a scenario improving torque or speed ? 5. How many turns do we get at the output gear after four rotations of the sun gear ? 6. So the input/output ratio is 95-EM-1100 SA-2 — Power Transfer consulab.com info@consulab.com 9 Scenario #5 : 1. Install the locking pin at the planet carrier. 2. Hold the sun gear handle and rotate three times. 3. Which gear represents the power output value ? 4. Regarding the power output gear, do we have a scenario improving torque or speed ? 5. How many turns do we get at the output gear after three rotations of the sun gear ? 6. So the input/output ratio is Scenario #6 : 1. Install the locking pin at the planet carrier. 2. Hold the ring gear handle and rotate 180°. 3. Which gear represents the power output value ? 4. Regarding the power output gear, do we have a scenario improving torque or speed ? 5. How many turns do we get at the output gear as a result of a 180° rotation of the ring gear ? 6. So the input/output ratio is Instructor : Grade : 95-EM-1100 SA-3 — Calculation of Gear Ratios consulab.com info@consulab.com 10 SA-3 — Calculation of Gear Ratios Name : Group : Date : Perform all tests following the procedure below as instructed. Write your answers on this page. It includes the activity description and the answer sheet. The importance of the correlation between the planetary gear train component movements and mathematics It is essential to understand that complex mechanical systems, such as planetary gears, cannot be fully understood without a solid foundation in mathematics. The movements of sun gear, planet carrier and ring gear are not random : They obey precise laws, expressed through algebraic formulas Mathematics acts here as a universal language, allowing to model, predict and optimize the behavior of the system. Without this understanding, the analysis remains superficial, even erroneous. Just take the example of the Willis for- mula, which allows the angular velocities of different components in the epicyclic gear train to be linked. This algebraic formula is essential to correctly analyze the transmission ratios in these systems The origin of the formula comes from Robert Willis, a 19th century British engineer and mechanic who contributed to the formalization of the laws of gear kinematics. He introduced this formula in his work on machine theory, notably in his book called Principles of Mechanism that was published in 1841. Willis was one of the first scientists to propose a systematic method to analyze relative speeds in complex mechanisms such as epicyclic gear trains, using the principle of motion superposition. Mastering the mathematical formulas associated with mechanical products is not a luxury, but a must. It not only en- ables better system design and diagnosis, but also efficient communication between engineers, researchers and techni- cians across language barriers. The objective of the following assignments is not to make you a proficient mathematician, but rather to allow you to handle simplified formulas already established. This will help you better understand the logic and structure underlying the operation of the system. 95-EM-1100 SA-3 — Calculation of Gear Ratios consulab.com info@consulab.com 11 Objective : Understand and calculate gear ratios for a simple planetary gear train. Material Required : Willis formulas, calculator and ConsuLab EM-1100 planetary gear set trainer. Procedure : Use the formulas required to calculate the gear ratios between the sun gear, planet carrier and ring gear. The Willis formula is a fundamental expression in the mechanics of gear systems, particularly in the analysis of epicyclic or planetary gears. It is used to link the rotational speeds of various components in the system. Each power transfer scenario can result in an algebraic formula. It is important to make the link. First, you must be able to interpret the algebraic formulas and the names of variables. To facilitate understanding, the original formulas have been adapted to allow the student to identify the variables and follow the process clearly and precisely. Simplified variables • Number : ( ) • Sun Gear : ( ) • Ring Gear or Crown : ( ) • Planet Carrier : ( ) If the planet carrier is stationary, the relationship is reversed and negative. In formulas, it is essential to understand the following algebraic abbreviations : • : Number of teeth in the ring gear • : Number of teeth in the sun gear • : Number of teeth in the planet carrier • The negative sign ( ) indicates that the output is rotating in the opposite direction to the input. Table of scenarios Scenario Stationary Component Input Output Adapted Willis Formula 1 Ring Gear Sun Gear Planet Carrier Ratio = 2 Ring Gear Planet Carrier Sun Gear Ratio = 3 Sun Gear Ring Gear Planet Carrier Ratio = 4 Sun Gear Planet Carrier Ring Gear Ratio = 5 Planet Carrier Ring Gear Sun Gear Ratio = 6 Planet Carrier Sun Gear Ring Gear Ratio = 95-EM-1100 SA-3 — Calculation of Gear Ratios consulab.com info@consulab.com 12 There are six different gear ratios that you can calculate, adding a direct drive (1 :1 ratio) and a neutral position (no output). For an enhanced experience, manipulate your ConsuLab EM-1100 planetary gear set to properly understand formulas used during scenarios. Refer to the “example” on the next page to correctly answer the questions in all steps. 1. Scenario #1 (example) : Use the suggested formula in the scenario table to calculate the ratio of the system using the following combination : Stationary ring gear, sun gear at input, planet carrier at output and explain the effect obtained by this scenario. A. Formula : Ratio = = 4,00 B. Ratio : 4,00/1 (Input/Output) C. Effect : Reduced speed and increased torque D. Direction of rotation : Same way 2. Scenario #2 : Use the suggested formula in the scenario table to calculate the ratio of the system using the following combination : Stationary ring gear, sun gear at input, planet carrier at output and explain the effect obtained by this scenario. A. Formula : B. Ratio : C. Effect : D. Direction of rotation : 3. Scenario #3 : Use the suggested formula in the scenario table to calculate the ratio of the system using the following combination : Stationary sun gear, ring gear at input, planet carrier at output and explain the effect obtained by this scenario. A. Formula : B. Ratio : C. Effect : D. Direction of rotation : 4. Scenario #4 : Use the suggested formula in the scenario table to calculate the ratio of the system using the following combination : Stationary planet carrier, nsun gear at input, ring gear at output and explain the effect obtained by this scenario. A. Formula : B. Ratio : C. Effect : D. Direction of rotation : consulab.com info@consulab.com 13 95-EM-1100 SA-3 — Calculation of Gear Ratios 5. Scenario #5 : Use the suggested formula in the scenario table to calculate the ratio of the system using the following combination : Stationary sun gear, planet carrier at input, ring gear at output and explain the effect obtained by this scenario. A. Formula : B. Ratio : C. Effect : D. Direction of rotation : 6. Scenario #6 : Use the suggested formula in the scenario table to calculate the ratio of the system using the following combination : Stationary planet carrier, ring gear at input, sun gear at output and explain the effect obtained by this scenario. A. Formula : B. Ratio : C. Effect : D. Direction of rotation : Instructor : Grade : 95-EM-1100 SA-4 — Compound Gear Ratios consulab.com info@consulab.com 14 SA-4 — Compound Gear Ratios Name : Group : Date : Perform all tests following the procedure below as instructed. Write your answers on this page. It includes the activity description and the answer sheet. In this activity, we explore a transmission system based on multiple compound planetary gearsets, a configuration commonly used in speed reduction mechanisms. We find this type of assembly, where the elements chain together to transmit movement in a fluid and controlled way, especially in Allison automatic transmissions, renowned for their per- formance in heavy vehicles. To calculate the gear ratio of a system with compound epicyclic (or planetary) gears, we use the Willis formula for each stage and then multiply the individual ratios together. P1 P2 P3 This cutaway Allison transmission from ConsuLab demonstrates technology with three compound planetary gears. The change of its 6 speeds is possible thanks to the clutch of the friction discs connected to various elements such as the sun gear, the planet carrier and the ring gear of each of the three planetary trains. Objective : Understand and calculate gear ratios for a double and then triple compound planetary set by using the math- ematical principles of Willis formulas. Material required : Willis formulas, calculator and ConsuLab EM-1100 planetary gear set. 95-EM-1100 SA-4 — Compound Gear Ratios consulab.com info@consulab.com 15 Procedure : 1. Use the formulas required to calculate the gear ratios between the sun gear, planet carrier and ring gear. Multiply the formulas to calculate the scenario involving the second identical planetary set coupled to the first as follows : A. First planetary gear set (P1) : • Sun gear : Input • Ring gear : Stationary • Planet carrier : Output • Formula : Ratio = = • Ratio : B. Second planetary gear set (P2) : • Sun gear : Input (driven by the first gear planet carrier) • Ring gear : Stationary • Planet carrier : Output • Formulas : P1 Planetary Gear Set P2 Planetary Gear Set (Ratio = ) X (Ratio = ) = • Ratio : • Effect : • Direction of Rotation : 2. Use Willis formulas to calculate the gear ratios between the sun gear, the planet carrier and the ring gear. Multiply the formulas to calculate the scenario involving the third identical planetary set coupled to the first as follows : • Sun gear : Input (driven by the second gear planet carrier) • Ring gear : Stationary • Planet carrier : Output • Formulas : P1 Planetary P2 Planetary P3 Planetary (Ratio = ) X (Ratio = ) X (Ratio = ) = • Ratio : • Effect : • Direction of Rotation : Instructor : Grade : 95-EM-1100 SA-5 — Understanding and Calculating Ratios of an Allison 1000 Transmission (Advanced) consulab.com info@consulab.com 16 SA-5 — Understanding and Calculating Ratios of an Allison 1000 Transmission (Advanced) Name : Group : Date : Perform all tests following the procedure below as instructed. Write your answers on this page. It includes the activity description and the answer sheet. Similarly to SA-4, we will study a transmission system based on three compound planetary gearsets and explore the configuration of the speed reduction mechanism used by the Allison transmission. This time you will use actual transmis- sion data to compare the manufacturer’s specifications with the results you have obtained from the suggested scenario to determine which transmission gear is engaged. Objective : Understand and calculate gear ratios for a planetary assembly used on the Allison transmission, using the mathematical principles of the Willis formula and the exact specifications of the system. Material Required : Willis formulas and calculator. Explanations : The Allison 1000 transmission is an automatic transmission equipped with several clutches (C1 to C5), electrically controlled by solenoids. It uses three epicyclic gear trains (P1, P2 and P3) to manage the gear ratios. • C1 and C2 are rotary clutches that transmit engine torque to various components of the planetary gears. C1 con- nects the input shaft to the common sun gear of planetary gears P2 and P3 • C3, C4 and C5 are stationary clutches that block certain components, such as ring gears and planet carriers, to change the gear ratio.. Input Shaft Output Shaft P1 P2 P3 C3 C4 C5 C1 C2 95-EM-1100 SA-5 — Understanding and Calculating Ratios of an Allison 1000 Transmission (Advanced) consulab.com info@consulab.com 17 Each clutch combination changes how power flows through the planetary gears. This allows different gear ratios to be obtained. The clutch combinations on the Allison transmission are as follows : Speed Ratios C1 C2 C3 C4 C5 1st 3.09:1 2nd 1.81:1 3rd 1.41:1 4th 1.00:1 5th 0.71:1 (Overdrive) 6th 0.61:1 Reverse 4.49:1 Neutral Park Clutch applied Clutch not applied Each gear on the Allison 1000 transmission has a unique and precise number of teeth that provide specific ratios : • P1 (Ring gear : 113 teeth / Sun gear : 61 teeth) → Ratio ≈ 2.85 • P2 (Ring gear : 113 teeth / Sun gear : 57 teeth) → Ratio ≈ 2.98 • P3 (Ring gear : 113 teeth / Sun gear : 54 teeth) → Ratio ≈ 3.09 Procedure : Answer the following questions by referring to the previous information and table. 1. Clutch activation : Which clutches are engaged when first gear is activated ? 2. On which gear(s) is power transferred when first gear is activated ? 3. Describe the scenario, including the clutches used and the planetary components of the power transfer (input shaft to transmission output shaft) when first gear is engaged. Refer to the illustration on the previous page ? 95-EM-1100 SA-5 — Understanding and Calculating Ratios of an Allison 1000 Transmission (Advanced) consulab.com info@consulab.com 18 4. Use the required formula to calculate the ratio (velocity #1) of the system using the previous combination and ex- plain the effect achieved by this scenario : - Formula : Ratio = - Ratio : - Effect : - Direction of rotation : Instructor : Grade : consulab.com info@consulab.com 19 95-EM-1100 SA-6 — Understanding SIMPSON (2th speed) compound planetary gear ratios of an Allison 1000 Series transmission (Advanced) SA-6 — Understanding SIMPSON (2th speed) compound planetary gear ratios of an Allison 1000 Series transmission (Advanced) The operation of the Simpson system is certainly the most difficult scenario. In general, a planetary works this way : • An input member. • Another is held fixed and is called the reaction member. • The third becomes the output member. A complex feature of planetary gear technology is when two cascading planetary gears transmit power to each other on two different elements, for example, when the Allison transmission second gear is engaged, the normally fixed reaction member is now rotating, the reaction member becomes the second input member which can be difficult to assimilate as everything rotates. The Simpson epicyclic gear train is a gear system consisting of two planetary gear trains sharing a common sun and a link with the planet carrier and ring gear of the clutch, which allows great compactness and high mechanical efficiency. In this configuration, the two sun gears are mechanically linked or driven by the same shaft, this configuration causes a particular phenomenon at the level of the sun gear P3, which is driven by two sources of movement simultaneou sly : On the one hand by the sun shared with the second gear P2, and on the other hand by the mechanical link with the planet carrier P2 and the ring P3. This double contribution of power to P3 makes it a strate- gic driving element, capable of combining the effects of rotation of the two trains. This phenomenon opens the way to greater flexibility in the trans- mission ratios, since it makes it possible to modulate the speed and the torque transmitted as a function of the fixed or engaged elements (ring gear, planet carrier, sun). Thus, the Simpson train can generate multiple gear ratios with fewer compo- nents, while optimizing the continuity and fluidity of the transmission. Thanks to this architecture, the Simpson train provides multiple forward gears and reverse gear with a reduced number of components, making it a robust and economical solution for transmission systems. Input Shaft Output Shaft P1 P2 P3 C3 C4 C5 C1 C2 consulab.com info@consulab.com 20 95-EM-1100 SA-6 — Understanding SIMPSON (2th speed) compound planetary gear ratios of an Allison 1000 Series transmission (Advanced) SA-6 — Understanding SIMPSON (2th speed) compound planetary gear ratios of an Allison 1000 Series transmission (Advanced) — Student Answer Sheet Name : Group : Date : 1. What is the difference between a one-member input configuration (classical system) and a two-member input config- uration (Simpson system) ? A. One-member input : B. Two-member input : 2. What is the main advantage of a two-input member Simpson system for modern automatic transmissions ? 3. In the Simpson two-input member configuration of the Allison transmission, which two components can be driven simultaneously ? What is the effect on planetary P3 ? Instructor : Grade : consulab.com info@consulab.com 21 95-EM-1100 Quiz and Additional Questions on Planatery Gear Trains Quiz and Additional Questions on Planatery Gear Trains Name : Group : Date : Part 1 : Multiple choice questions Circle the correct answer. 1. What is the main role of the EM-1100 trainer ? A. Introduce the student to basic ratio calculations B. Introduce the student to the principles of planetary gears C. Introduce the student to the principles of manual transmissions D. Introduce the student to astronomy 2. What are the three main elements of a planetary gear train ? A. Sun gear, planetary gears (planet carrier), ring gear B. Helical gear, sun gear, ring gear C. Spur gear, shaft, sprocket D. Ring gear, shaft, sun gear 3. Which component must be stationary to obtain the neutral position in the planetary system ? A. None B. Sun gear C. Planet carrier D. Crown 4. What is the main advantage of planetary gears in modern automatic transmissions ? A. Their low cost B. Their robustness and compactness C. Their low efficiency D. Their complexity Part 2 : Additional Questions 5. Name two industrial applications where planetary gears are used. consulab.com info@consulab.com 22 95-EM-1100 Quiz and Additional Questions on Planatery Gear Trains 6. Explain the difference between a torque-enhancing scenario and a speed-enhancing scenario in a planetary gear train. Give examples of application. Torque : Examples of application : Speed : Examples of application : 7. What is the main difference between straight teeth and helical teeth on a planetary gear ? 8. What are the advantages of helical teeth over straight teeth in a gear system ? Part 3 : Planetary Gears and Mathematics 9. Willis formulas are effective for finding the gear ratio. Identify the formula to use for each of the following scenarios : A. Scenario : Stationary ring gear, sun gear at the input, planet carrier at the output Formula : B. Scenario : Stationary ring gear, planet carrier at the input, sun gear at the output Formula : C. Scenario : Stationary planet carrier, sun gear at the input, ring gear at the output Formula : D. Scenario : Stationary sun gear, ring gear at the input, planet carrier at the output Formula : consulab.com info@consulab.com 23 95-EM-1100 Quiz and Additional Questions on Planatery Gear Trains 10. When we have a system consisting of two planetary gear sets in cascade, how is the total gear ratio calculated ? Give an example of formula : 11. Why is it important to master the mathematical formulas associated with planetary gears in mechanics ? Instructor : Grade : consulab.com info@consulab.com 24 95-EM-1100 Technical Terms Glossary Technical Terms Glossary Sun gear Toothed gear located at the center of the planetary system, typically shown in yellow in ConsuLab equipment. It is one of the three main components of the planetary gearset. Planet pinions Small gears (in green) that rotate around the sun gear and are mounted on the planet carrier. Ring gear Large external gear (in black) that surrounds the planet pinions. Planet carrier Support on which the planet pinions are mounted, allowing them to rotate around the sun gear. Input member The component of the planetary gearset to which motion or engine torque is applied. Output member The component of the planetary gearset that transmits motion or torque out of the system. Reaction member A component held stationary or immobilized to enable torque transmission and create different gear ratios. Locking (Immobilization) The action of holding a component (sun gear, ring gear, or planet carrier) stationary to achieve a specific operating mode or ratio. Gear ratio The ratio between the rotational speed of the input element and that of the output element. It determines the increase or decrease in speed and torque. Torque Rotational force transmitted by the gear system. Direction of rotation The orientation of the output motion relative to the input (same direction or opposite direction). consulab.com info@consulab.com 25 95-EM-1100 Technical Terms Glossary Neutral position Configuration in which no component is immobilized, preventing motion from being transmitted to the output. Direct drive (1:1) Configuration in which two components are locked together, resulting in a transmission ratio of 1:1 (same input and out- put speed). Willis formula Mathematical formula used to calculate speed ratios in a planetary gearset based on the components used as input, output, or reaction members. Compound planetary gearset A system that includes multiple planetary gearsets combined to produce more complex transmission ratios (e.g., Simp- son system). Hydraulic clutch pack A device that locks or releases certain components of the planetary gearset, commonly used in automatic transmis- sions. Allison 1000 transmission An example of an automatic transmission using multiple planetary gearsets and clutches to obtain different gear ratios. Simpson system A type of compound planetary gearset made of two assemblies sharing a common sun gear, allowing multiple forward speeds and one reverse gear. Spur teeth / Helical teeth Types of gear teeth: spur teeth are parallel to the axis, while helical teeth are angled, providing quieter and smoother operation. consulab.com info@consulab.com 26 95-EM-1100 Notes Notes 400-6330 Zéphirin-Paquet St. Québec QC G2C 0M3 Canada © ConsuLab Educatech Inc, 2025. All rights reserved. Theory Basic operation Student Assignments SA-1 — Component Identification SA-2 — Power Transfer SA-3 — Calculation of Gear Ratios SA-4 — Overlapped Gear Ratios SA-5 — Understanding and Calculating Ratios of an Allison 1000 Transmission (Advanced) SA-6 — Understanding SIMPSON (2th speed) compound planetary gear ratios of an Allison 1000 Series transmission (Advanced) SA-6 — Understanding SIMPSON (2th speed) compound planetary gear ratios of an Allison 1000 Series transmission (Advanced) — Student Answer Sheet Quiz and Additional Questions on Planatery Gear Trains Part 1 : Multiple choice questions Part 2 : Additional Questions Part 3 : Planetary Gears and Mathematics Technical Terms Glossary