Trelleborg Sealing Solutions launches its new Zurcon® Excluder® ESA hydraulic scraper, to prevent the ingress of contaminants into aerospace landing gear shock absorbers. The unique scraper design combines optimal scraping performance with advanced wear resistance, to extend the life of the shock absorbers.
Trelleborg’s Zurcon® Excluder® ESA features an energized elastomer O-Ring, which ensures effective scraping performance when the scraper experiences side loads at both low and high temperatures. Additionally, the O-Ring makes the Zurcon® Excluder® ESA easier to install into closed gland positions than traditional metal spring energized scrapers. Specified in a range of elastomer materials, the O-Ring can be compatibility matched to the specific media used in the application.
Marc Flageole, Project Engineer at Trelleborg Sealing Solutions Aerospace, says: “The launch of the new Zurcon® Excluder® ESA scraper ensures we have a fully rounded sealing portfolio for aerospace landing gear shock absorption applications. The scraper design uses standard sizes to fit existing hardware designs commonly used in aircraft landing gear shock absorbers. This simplifies seal specification and ensures easy installation into common size closed glands.”
The unique design of the Zurcon® Excluder® ESA scraper includes a 90-degree lip to maximize performance and prevent the ingress of contaminants into the lower bearing of the shock strut. An angled outer diameter sealing lip enables a secure fit into the scraper gland and facilitates easier assembly. The Zurcon® ESA jacket structure features an extended heel to stabilize the seal during operation, and a rounded outer diameter corner to match the groove corner radius to prevent distortion.
Manufactured from Trelleborg’s abrasion-resistant Zurcon® polyurethane (PU) material, the Zurcon® Excluder® ESA demonstrates extended service life. This material is compatible with a wide range of common hydraulic fluids, as well as deicers and cleaning fluids typically found in landing gear shock absorbers. The Zurcon® Excluder® ESA is operational through a temperature range of -54 oC to +107 oC / -65 oF to +225 oF, in high-altitude and high-pressure conditions.
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