TAILIEUCHUNG - Automatic Transmissions P9

A340H Transfer | Section 9 A340H TRANSFER Lesson Objectives 1. Given the clutch application chart for the A340H Transfer Unit identify the holding devices applied in the following gear positions High gear two-wheel drive High gear four-wheel drive Low gear four-wheel drive 2. Describe the operation of the sprocket and drive chain in transferring torque to the front axle. Automatic Transmissions - Course 262 137 Section 9 CAUTION Components The A340H automatic transfer unit is bolted to the rear of the transmission housing and provides a means of selecting between 2-wheel drive H2 4-wheel drive H4 and low 4-wheel drive L4 while the vehicle is moving. There is no restriction on vehicle speed while shifting between H2 and H4. There is however a speed requirement when shifting between H4 and L4 and that speed is less than 19 mph. Never move the front drive control lever if the wheels are slipping. The transfer unit uses a simple planetary gear assembly to accomplish high and low gear ratios. High gear is a direct drive through the planetary gear set. Low gear is a reduced gear ratio when increased torque is required. Transfer Planetary Gear Provides direct drive in two-wheel and four-wheel drive as well as low-gear four-wheel drive. Transfer Direct Clutch C3 Front Drive Clutch C4 Low Speed Brake B4 Transmission Transfer Planetary Irans e Output Shaft Gear Unit Output Shaft Chain Chain Sprocket Front Drive Shaft 138 TOYOTA Technical Training A340H TRANSFER The transfer unit has three shafts The transmission output shaft The transfer output shaft The front drive shaft The transmission output shaft is connected to the planetary sun gear and the transfer output shaft is connected to the planetary carrier. The ring gear is connected to the transfer housing through a holding device. A chain sprocket idles around the transfer output shaft and a drive chain transfers driving torque from the chain sprocket to the front drive shaft. Holding Devices Three holding devices are used to control the .

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