Differential Gear & Propeller Shaft
Overview
In FR vehicles, the engine power is transmitted to the rear differential gear via the propeller shaft. The fact that the center bearing used to support the propeller shaft is located on the vehicle's exterior gives rise to a demand for optimum mud and turbid water resistance in addition to maintaining fast rotational speeds. Due to the large speed-reduction gear ratio of the rear differential gear that conveys engine power to the rear wheels, a large gear-interlocking load affects the bearings that provide support for the pinion gear and the ring gear. In particular, bearings that support the pinion gear require low torque and high durability since these bearings rotate at the same speed as the propeller shaft.
Product List
Long life in contaminated oil including metal wear powder has been achieved by original materials and heat treatment. Size reductions from standard open type bearings are available.
Low friction torque has been achieved by logical friction analysis and improved parts surface processing technology.
For a pinion shaft pilot in a straddle mount type differential of heavy trucks. The full roller design allows for heavy radial loads.
Low friction torque and improvement of seizure resistance between the spider and bearings have been achieved by using specially designed bearing cups.
Center support bearings for propeller shaft with high sealing performance against mud, turbid water, and particles.
Thin walled and large diameter bearings for 4WD coupling. These bearings with large bore and minimized outer diameter have superior heat resistance, high load capacity, and sealing performance against mud and turbid water.
FAQs
Loads are defined by their direction. Loads perpendicular to the shaft are called radial loads and loads parallel to the shaft are called axial (thrust) loads.
While DGBBs can handle axial loads in both directions, single-row angular contact ball bearings can only receive axial load in one direction.
Seals and shields offer additional protection for bearing components and help to improve and maintain lubrication. In terms of sealing performance, sealed bearings rank best, followed by shielded bearings, then finally open bearings. NMT uses supplementary designations D, DU, DW, and V (DD, DDU, DDW, VV) for sealed bearings and Z (ZZ) for shielded bearings. No supplementary designations are listed for open bearings.
