Patent ID: 8157703
Filing Date: 2012-04-17
Classification: B60K,B60W,F16D,Y10T

Abstract:
1. A power transfer device that distributes a drive force that is output from a transmission system to a main drive wheel and an auxiliary drive wheel, comprising: a main drive side output shaft that is provided between said transmission system and said main drive wheel, and transmits drive force to said main drive wheel; an auxiliary drive side output shaft that is provided between said transmission system and said auxiliary drive wheel, and transmits drive force to said auxiliary drive wheel; a friction clutch mechanism that is provided between said transmission system and said auxiliary drive side output shaft, and controls the drive force that is distributed to said auxiliary drive wheel; and a control unit comprising a vibration judgment section and a clutch control section, wherein said vibration judgment section determines a vibration state in said main drive side output shaft based on the rotation state of said main drive side output shaft; and said clutch control section decreases the fastening force of said friction clutch mechanism based on the vibration state of said main drive side output shaft, and wherein said friction clutch mechanism is a hydraulic clutch mechanism, the fastening force of which is regulated by hydraulic oil whose pressure is regulated by a duty control valve; said vibration judgment section calculates the vibration frequency of said main drive side output shaft based on the rotation state of said main drive side output shaft; and said clutch control section decreases the fastening force of said friction clutch mechanism when the vibration frequency of said main drive side output shaft converges to a specified range that is set based on the drive frequency of said duty control valve.