Two-speed transfer case with non-synchronized range shift mechanism and on-the-move range shift control system
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United States of America Patent
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Mar 27, 2018
Issued Date -
N/A
app pub date -
Dec 11, 2015
filing date -
Dec 17, 2014
priority date (Note) -
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Abstract
A transfer case for a four-wheel drive motor vehicle includes a two-speed range clutch unit, a mode clutch unit, a power-operated actuation mechanism and a control system. The actuation mechanism includes an electric motor, a geartrain driven by the motor for controlling rotation of an actuator shaft, a range actuator assembly and a mode actuator assembly. The range actuator assembly functions to move a shift collar associated with the range unit in response to rotation of the actuator shaft. The mode actuator assembly includes a mode cam and a ballramp unit. The mode cam is rotatively driven by the actuator shaft for controlling the clutch engagement force exerted on the friction clutch by the ballramp unit. The control system controls movement of the shift collar during motive operation of the motor vehicle to permit on-the-move range shifting.
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