In response to the strong expansion of battery electric vehicle (BEV) market, JTEKT and its group company Koyo sealing techno has developed “JTEKT Ultra Compact Seal (JUCS)”, as compact diff. side oil seal for BEV eAxle.
At low temperatures such as below zero, the rubber of the differential side seal hardens, reducing the ability of the seal lip to follow shaft eccentricity and increasing the possibility of oil leakage from the eAxle. In response to this, we have developed a rubber material with 1.2 times the low-temperature resistance of conventional materials. In addition, by optimizing the rubber and spring, we have improved the ability to follow the eccentricity at low temperatures.
As a result, it has become possible to shorten the lip length of the inner circumference of the seal by 20% while maintaining the same eccentricity followability as before.In addition, the outer periphery of the seal has a structure in which the metal ring and the housing are in contact with each other, maintaining the seal retention force that decreases due to the reduction in width.
With the size mainly used for differential side seals, which has an outer diameter of 50 to 80 mm and a width of 9 to 12 mm, it is possible to shorten the seal width by approximately 4 mm on both sides, contributing to shortening the eAxle unit length.
