23-06-2012, 01:55 PM
TRANSFER GEAR BOX
TRANSFER GEAR BOX.pptx (Size: 541.13 KB / Downloads: 44)
WHAT IS TRANSFER BOX
A transfer case is a part of a four-wheel-drive system found in four-wheel-drive and all-wheel-drive vehicles. The transfer case is connected to the transmission and also to the front and rear axles by means of drive shafts.
FUNCTION
The transfer case receives power from the transmission and sends it to both the front and rear axles. This can be done with a set of gears, but the majority of transfer cases manufactured today are chain driven
An on-road, transfer case synchronizes the difference between the rotation of the front and rear wheels.
Transfer cases designed for off-road use can mechanically lock the front and rear axles when needed.
The transfer case may contain one or more sets of low range gears (generally for off-road vehicles). Low range gears are engaged with a shifter or electronic switch. On many transfer cases, this shifter is the same as the one that selects 2WD or 4WD operation. Low range gears slow down the vehicle and increase the torque available at the axles.
TYPES OF USED
Those used on "part-time four-wheel-drive" system off-road vehicles such as trucks, trudges, rock-crawling vehicles, and some military vehicles generally allow the driver to select 2WD versus 4WD as well as high versus low gear ranges. Those used in sports cars are usually "transparent" to the driver; there is no shifter or select lever.