Cassette Seals: Innovation

Home > Products > Cassette & Combi Seals > Product & Innovation

Products

	Cassette seal design "type 1" : features : reduced internal friction, good dust protection application : hub and pinion of trucks
	Cassette seal design "type 2" : features : double labyrinth, optimized mud and dust protection application : hub on truck vehicles on road / off road; generic industrial applications with high speed
	Cassette seal design "type 3" : features : 4 labyrinths, best allowable mud and dust protection application : hub and PTO off road trucks, excavators, tractors; heavvy industry application with medium-low idle

	Combi seal design standard : features : basic mud and dust protection with cellular PU; allow axial shaft movement application : generic industrial applications, propeller shaft, hub
	Combi seal design "SF5" : features : basic mud and dust protection with compact PU wiper; allow axial shaft movement application : generic industrial and off-road applications
	Combi seal design "SF6" : features : good mud and dust protection with compact PU wiper; allow axial shaft movement application : generic industrial and off-road applications
	Combi seal design "SF8" : features : good mud and dust protection with compact PU wiper; allow axial shaft movement application : generic industrial and off-road applications"

Innovation

In the past, the main Cassette seal improvements were aimed at reducing dirt ingress in extremely contaminated conditions. For this reason, high investments were dedicated to developing and building test rigs capable of giving the right results to the developers working on concepts and details.

By optimising in steps, the running-time before water ingress has been increased to more than 2000 hrs. The Chart shows results from Cassette seal testing from recent years (shaft dimension 136,8 mm). The Step 1 result is similar to what one could expect with a spring loaded dust-lip in similar conditions. The seal duration (Hours) is the average life of samples tested, in the Freudenberg Slurry bench-test.

To increase muddy water resistance, an important feature is to maintain friction at an acceptable level, and this is possible by designing dust-lip shapes which do not increase the inner operating temperature and friction torque. In following charts, results are shown for a Cassette seal before and after improvements, in this case average torque has been reduced by 65%.