Which of the following is NOT one of three ways that the engine's rotational power can be transmitted to the gear train in a World Transmission?

Which of the following is NOT one of three ways that the engine's rotational power can be transmitted to the gear train in a World Transmission?

• A. Through the P-1 sun gear
• B. Through the P-2 and P-3 sun gears
• C. Through the P-2 carrier
• D. Through the P-2 ring gear

Answer: (D)

In a World Transmission, power from the engine is handed off into the gear train mainly through rotating members designed to carry torque between stages: the sun gear of the input stage, the sun gears of subsequent stages, or the carrier that connects gears in a stage. The outer ring gear, while an important housing element and often involved in the braking or reaction of the set, isn’t used as a primary input path for engine torque in this arrangement. That’s why transmitting power through the P-2 ring gear isn’t a valid path—the engine’s rotational power doesn’t flow through the ring gear to drive the gear train. The actual power paths are via the P-1 sun gear, via the P-2 and P-3 sun gears, or via the P-2 carrier.

In a World Transmission, power from the engine is handed off into the gear train mainly through rotating members designed to carry torque between stages: the sun gear of the input stage, the sun gears of subsequent stages, or the carrier that connects gears in a stage. The outer ring gear, while an important housing element and often involved in the braking or reaction of the set, isn’t used as a primary input path for engine torque in this arrangement. That’s why transmitting power through the P-2 ring gear isn’t a valid path—the engine’s rotational power doesn’t flow through the ring gear to drive the gear train. The actual power paths are via the P-1 sun gear, via the P-2 and P-3 sun gears, or via the P-2 carrier.