Inspection method for inspecting electric drive apparatus

Patent metadata

Field	Value
Publication number	US-2015134195-A1
Application number	US-201414537938-A
Country	US
Kind code	A1
Filing date	Nov 11, 2014
Priority date	Nov 14, 2013
Publication date	May 14, 2015
Grant date	—

Abstract

An inspection method of the present invention performs a step of giving the electric motor an instructing for rotating a foot shaft in a reverse direction and checking whether the foot shaft is rotating in the reverse direction, and a step of checking whether hydraulic pressure acting on the hydraulic pump has reached a predetermined pressure level. By checking a rotating direction of the electric motor, it is possible to check electrical connections. By checking the hydraulic pressure, it is possible to check whether there is any trouble in a hydraulic system. Namely, the present invention can perform an electrical connection check and a hydraulic pressure check in a collective fashion.

First claim

What is claimed is:

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 inspection method comprising:
a step of giving the electric motor an instructing for rotating the foot shaft in the reverse direction and checking whether the foot shaft is rotating in the reverse direction; and
a step of checking whether hydraulic pressure acting on the hydraulic piston has reached a predetermined pressure level.

2 . The inspection method according to claim 1 , wherein the electric drive apparatus includes left and right electric motors, left and right sun gears, left and right planet gears, left and right ring gears and left and right carriers, and wherein the left and right electric motors, the left and right sun gears, the left and right planet gears, the left and right ring gears, the left and right carriers, the brake plate, the hydraulic piston and the one-way clutch are accommodated together in the case.

3 . The inspection method according to claim 1 , wherein the electric drive apparatus is mounted on a vehicle, and a test is performed on the electric drive apparatus with the vehicle placed on a bench test machine.

Assignees

• Honda Motor Co Ltd

Inventors

• Fukei Hirotsune
• Saitou Manato
• Hirai Yoshitaka
• Tsuchida Minoru
• Ueda Masahide

Classifications

• G01M15/05 Primary

  by combined monitoring of two or more different engine parameters · CPC title

• G01M13/022

  Power-transmitting couplings or clutches · CPC title

• G01M17/007

  Wheeled or endless-tracked vehicles (G01M17/08 takes precedence) · CPC title

• G07C5/0808 Primary

  Diagnosing performance data (testing of vehicles G01M17/00; testing of electrical installation on vehicles G01R31/005) · CPC title