Patent ID: 12012843

Abstract:
A downhole tool (1) comprises a power control module (20), which includes a battery pack (22) for supplying power to components of the tool, and an electronic control circuit (24) for controlling the supply of power by the battery pack. The electronic control circuit (24) and battery pack (22) are contained within a housing (26) that allows their insertion and removal as a single unit. The tool (1) also comprises an electric motor (104) for powering a gear assembly (210), and a braking system comprising an electrical and a magnetic brake for braking the motor (104) when required. The gear assembly (210) comprises two or more stages (222, 232, 242, 252, 262), each having a sun gear (223, 233, 243, 253, 263) with a respective diameter, and each sun gear 223, 233, 243, 253, 263 having a raised convex dimple (223LD, 233UD, 233LD, 243UD) that is in constant touching contact with the adjacent sun gear's (223, 233, 243, 253, 263) raised convex dimple (223LD, 233UD, 233LD, 243UD), allowing load experienced by the tool (1) to be transferred along a load path including the dimples (223LD, 233UD, 233LD, 243UD), reducing vibrations and shocks.