The prime source of vibration and noise in a gear system is the transmission error between the meshing gears. Transmission error is caused by manufacturing inaccuracy, mounting errors, and elastic deflections under load. Gear designers often attempt to compensate for transmission error by modifying gear teeth.
(Source: www.grc.nasa.gov/WWW/RT2000/5000/5950oswald.html)
Tubular shafts are hollow shafts that allow the natural bending frequency and the torsional stiffness to be tuned to customer requirements. Monobloc tubular shafts are tubular shafts made from one piece of material. They have the highest tuning potential for natural bending frequency and torsional stiffness, enabling noise reduction at the lowest weight. MTS can be manufactured using a combination of drawing, forming and hardening processes with either a constant diameter and constant wall thicknesss or with a reduced wall thickness in the centre section. Furthermore the Monobloc tubular shaft can provide a significant contribution to weight saving against a conventional barshaft/damper design.
A torque-sensing limited slip differential where gear separation forces react directly or through a cam mechanism against a friction clutch pack. The resulting torque bias limits differential action.