In response to the strong expansion of battery electric vehicle (BEV) market, JTEKT has developed JTEKT Ultra Compact Diff. (hereafter referred to as JUCD), as differential for BEV eAxle.
JUCD is extremely small compared with traditional differential for the same strength.

Needs for eAxle compactness

Following with automotive electrification growth trend, development and production of eAxle, which integrate inverter, motor, and reducer including differential, is growing rapidly worldwide. In order to develop a better BEV, the eAxle, which is the heart of eDrive system, is required to be smaller and should have higher power density in future.
In response to this market need, demand of very compact differential for eAxle is expected to grow, and will replace the bevel gear differential widely used for traditional vehicles.

JUCD Background

JTEKT has developed a very compact size and highly durable differential as JTEKT Ultra Compact Diff., which is suitable for BEV eAxle. A differential is a device that absorbs the rotational speed difference between the left and right wheels that occurs in cornering, and transfer the torque between drive power source to both wheels.
We have further evolved the Torsen Limited Slip Differential (LSD) technology, which is a high-performance differential suitable for high power 4WD / sports vehicles, by adding new knowledge of gear design and machining technologies. Introducing smaller gear module geometry into the unique composite planet gear set, we have made it smaller in radial and axial directions, and reborn as JUCD general-purpose product for eAxles.