| 摘要 |
<p>Disclosed in the present invention is a transmission system of a transfer case which can shift from a high speed mode to a low speed mode without gear shifting shock, especially, even when a vehicle travels at a certain speed. The transmission system of a transfer case according to the present invention comprises: a planetary gear assembly composed of a sun gear, a pinion gear, a ring gear, and a carrier; a shift sleeve; and a hydraulic system composed of a hydraulic circuit and a hydraulic cylinder connected to the hydraulic circuit, and receiving a hydraulic pressure from a hydraulic pressure supply source. Especially, the transmission system of a transfer case according to the present invention moves the shift sleeve as an operation rod of the hydraulic cylinder is connected to the shift sleeve, by additionally including a clutch piston device installed in a housing, and including a clutch piston receiving the hydraulic pressure from the hydraulic pressure supply source. The clutch piston of the clutch piston device is connected to the ring gear of the planetary gear assembly, and the ring gear is not rotated in accordance with the operation of the clutch piston.</p> |
