Patent ID: 9279743
Filing Date: 2016-03-08
CPC Classification: G01M

Claim Text:
1. An inspection method for inspecting an electric drive apparatus as an inspection object, the electric drive apparatus including: an electric motor; a sun gear mounted on a motor shaft of the electric motor; a planet gear meshing with the sun gear; a carrier rotatably supporting the planet gear; a foot shaft connected to the carrier; a ring gear meshing with the planet gear and surrounding the planet gear; a brake plate provided between a case enclosing the ring gear for switching the ring gear between a rotatable state and a non-rotatable state; a hydraulic piston for pressing the brake plate; and a one-way clutch provided between the case and the ring gear and constructed to place the ring gear in the non-rotatable state when the foot shaft rotates in a forward direction but place the ring gear in the rotatable state when the foot shaft rotates in a reverse direction, the electric drive apparatus being mounted on a vehicle, the vehicle having one of front and rear wheels driven by a vehicle-mounted engine and the other of the front and rear wheels driven by the electric drive apparatus, the inspection method comprising the steps of: