If you're Rh negative and your baby is Rh positive, however, your body might produce proteins called Rh antibodies after exposure to the baby's red blood cells. The antibodies produced aren't a problem during the first pregnancy.he Rh factor test is done during pregnancy to identify a woman's Rh factor. In some cases, the baby's father might need an Rh factor test, too. During pregnancy, problems can occur if you're Rh negative and the baby you're carrying is Rh positive.
Torque converter, opened, interior similar to a retarder. A retarder is a device used to augment or replace some of the functions of primary friction-based braking systems, usually on heavy vehicles. Retarders serve to slow vehicles, or maintain a steady speed while traveling down a hill, and help prevent the vehicle from running away by accelerating down the hill.
BRAKING THROUGH RESISTANCE. Allisonâs hydraulic retarder is basically a vaned flywheel in the transmission housing. The transmission directs oil into the retarder housing to absorb the vehicleâs energy through the drive shaft. The absorbed energy is converted to heat and dissipated through the vehicleâs cooling system.he hydraulic retarder is a most simple device, and has only one moving part -- a rotor or paddle wheel.. The truck wheels turn the rotor through the transmission. The rotor throws the oil in the rotor cavity against the fixed stator vanes, which resist the oil flow.