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BEARINGS, SEALS & GASKETS FEATURE


New generation of axlebox bearings meets rail industry demands


A


utomation is making advances in the rail


industry, with the assembly of rail bogies being one area. So, to facilitate the process of mounting axlebox bearings, Schaeffler engineers have combined the axlebox bearing, labyrinth ring,


and axle cover to create a ready-to-fit unit. With this design, two plastic retaining rings hold the components together on the inner diameter, and the handling of individual components is no longer required. The new FAG TAROL tapered roller bearing units can therefore be pressed on more quickly during the mounting process. Designed for every size, the retaining


rings ensure that the labyrinth ring and the axle cover are seated firmly on the axlebox bearing, and they are also equipped with a rubber seal that seals the joining surfaces between the rings, preventing the ingress of moisture into the gap. When it comes to mounting the rail


bearings, the entire hydraulic system is now mounted on a height-adjustable scissor lift truck platform, and the fitter can set the platform to the required height using a foot


pedal. The hydraulic cylinder has an articulated support and can be easily positioned to match the shaft end. A version of the mounting device equipped with a digital force-travel


measurement system and touchscreen enables the user to document the mounting and pressing-on of the bearing up to the shaft shoulder.


SEAL SOLUTIONS The axlebox bearing seals are responsible for a large proportion of the total friction and therefore the required drive power. As the friction on the seal continuously transfers heat to the axlebox bearing, the development of the new cassette seal is also focused on reducing friction, as well as ensuring a high level of protection against the ingress of contamination into the bearing. The design is structured in several stages: an outer dust shield prevents the ingress of coarse contaminant particles; a converging gap between the dust shield and the bearing ring also reduces the ingress of water and dust; the secondary shield gathers and ejects any residual contamination; and the optimised design of the interference fit between the main seal lip and bearing ring allows friction to be significantly reduced. Of further benefit, the new design has allowed a reduction of up to 25% in the overall seal width to be achieved.


Schaeffler www.schaeffler.co.uk TECHNOLOGY IN ACTION ADVERTORIAL New from Moontown


team, can assist in the choice of the correct seal design and material in applications involving extremes of temperature, pressure, hazardous or aggressive chemicals. Moontown also offers a complete production service which we call ‘Powder to Part’, made up of the following areas: • Bespoke seal design service • In-house PTFE billet production • Experienced CNC programmers • Advanced on-site CNC machining • In-house spring winding • In-house EDM facilities for tool making


Moontown’s capabilities range from 2mm rod seals to


2000mm piston seals, designed for either linear, rotary or flanged face seal applications. Effective sealing solutions can be achieved with PTFE spring energised and hydraulic seals for applications in the chemical, oil and gas, automotive, food and pharmaceuticals as well as a wide range of general engineering fields. These are complimented by a wide range of metal O, C and E seals, including spring energised resilient metal seals.


M


oontown Ltd is a Nottingham based manufacturer of spring energised, hydraulic and associated sealing


products, using PTFE and other high performance plastics. Moontown is also a distributor of metal seals.


Established in 1996, the company has invested in NORSOK M-710 REV 2 and API 6A Annex F sour fluid immersion testing approvals, as well as being ISO 9001:2015 approved.


With many years of experience in solving sealing


problems associated with a wide range of applications and industries, Moontown’s technical and design support


CONNECTINGINDUSTRY.COM/DESIGNSOLUTIONS


Moontown Ltd  01623 751515  www.moontown.co.uk


DESIGN SOLUTIONS | DECEMBER/JANUARY 2019 31


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