In the World Transmission, which component’s gear arrangement is explicitly used to transfer power to the gear train in forward operation and is not the P-2 ring gear?

In the World Transmission, which component’s gear arrangement is explicitly used to transfer power to the gear train in forward operation and is not the P-2 ring gear?

• A. P-1 sun gear
• B. P-2 ring gear
• C. P-2 carrier
• D. P-3 sun gear

Answer: (A)

The starting point for forward power flow in the World Transmission is the sun gear of the first planetary set. This P-1 sun gear is driven by the input and meshes with the P-1 planet gears, which then drive the rest of the gear train and ultimately the output. The P-2 ring gear isn’t part of the forward power path; it’s involved in other configurations (such as different gear ratios or reverse) depending on which clutches are engaged. The P-2 carrier and the P-3 sun gear have roles in those other pathways, but the forward transfer from input into the gear train is through the P-1 sun gear.

The starting point for forward power flow in the World Transmission is the sun gear of the first planetary set. This P-1 sun gear is driven by the input and meshes with the P-1 planet gears, which then drive the rest of the gear train and ultimately the output. The P-2 ring gear isn’t part of the forward power path; it’s involved in other configurations (such as different gear ratios or reverse) depending on which clutches are engaged. The P-2 carrier and the P-3 sun gear have roles in those other pathways, but the forward transfer from input into the gear train is through the P-1 sun gear.