Wear ring developed for telescopic application
A
Trelleborg Sealing Solutions UK product story
Edited by the Engineeringtalk editorial team
Apr 27, 2006
Seal configuration with a different design of wear ring meets all performance requirements and saves money in telescopic hydraulic cylinders in tipper trucks.
Busak + Shamban has developed a seal configuration with a different design of wear ring.
This has proved to meet all performance requirements and save money in telescopic hydraulic cylinders in tipper trucks.
Tipper trucks are operated using telescopic cylinders with three, four, five or more steps.
Of a compact design, the wall thickness of the cylinders is thin and they have a short guiding length, the guiding achieved either by nitrading the machined steel rod or by installing wear rings.
Seal developer and manufacturer Busak + Shamban has long been involved in the hydraulics industry and decided to investigate the optimum sealing and wear ring arrangement for this application.
In addition to fitting into an extremely narrow installation space, the seal and wear ring combination also needed to work at a pressure of 21MPa.
It had to retain integrity at temperatures from -40 to +110C, operate at speeds reaching 0.5m/s and be resistant to mineral oil based hydraulic fluids and bio oils.
Static and dynamic sealing had to be maintained, even when the cylinders were subject to severe vibration caused by the truck driving on rough surfaces.
Engineers came up with numerous proposals, which they tested in a virtual environment using computer simulation techniques, including advanced FEA modelling.
The optimum design proved to be a combination of seal, scraper and wear ring specific to these telescopic applications.
The recommended U-cup seal and Scraper RTL or RTI are both manufactured from Zurcon, the Busak + Shamban proprietary polyurethane based material developed for sealing elements.
This material has good friction characteristics and temperature performance and almost universal chemical resistance.
The wear ring is made from Himod HM061, an engineered thermoplastic.
Its L shape met all the performance requirements and allowed the dimension of the steel tube to be reduced, lowering overall manufacturing costs.
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