TAILIEUCHUNG - Automatic Transmissions P3

Simpson Panetary Gear Unit | Section 3 SIMPSON PLANETARY GEAR UNIT Lesson Objectives 1. Manipulate transmission components to demonstrate power flow through a simple planetary gear set for Gear reduction Gear increase overdrive Reverse 2. Identify the three major components of the simple planetary gear set. 3. Describe the function of the simple planetary gear set to provide Rotational speed change Rotational torque change Change in rotational direction 4. Demonstrate the measurement for wear on planetary carrier assembly and determine serviceability. 5. Describe the operation of the following holding devices Multiplate clutch Brake band One-way clutch Automatic Transmissions - Course 262 SECTION 3 Toyota automatic transmissions use the Simpson-type planetary gear unit. This unit is made up of two simple planetary gear sets arranged on the same axis with a common sun gear. These gear sets are called the front planetary gear set and the rear planetary gear set based on their position in the transmission. These two planetary gear sets result in a three-speed automatic transmission having three forward gears and one reverse gear. Simpson Planetary Gear Set Made up of two simple planetary gear sets arranged on the same axis with a common sun gear. These planetary gear sets the brakes and clutches that control their rotation and the bearings and shafts for torque transmission are called the planetary gear unit. The planetary gear unit is used to increase or decrease engine torque increase or decrease vehicle speed reverse direction of rotation or provide direct drive. It is basically a lever that allows the engine to move heavy loads with less effort. There is an inverse relationship which exists between torque and speed. For example when a vehicle is stopped it requires a great deal of torque to get it to move. A low gear is selected which provides high torque at low vehicle speed. As the heavy load begins to move less leverage is required to keep it in motion. As the load remains in motion and .

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