Sealed bearing

US6712519B2 · kind B2 · utility

Assignee

• Bombardier-Rotax GmbH · AT

Inventors

• Gunter Zauner · Eferding, AT
• Michael Seyrl · Wels, AT

Key dates

• Filing date: Jul 27, 2001
• Grant date: Mar 30, 2004
• Expiry date: Jul 27, 2021

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16C2360/22
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A sealed bearing assembly for supporting a rotating shaft and, in particular, a crankshaft of a two-stroke engine includes an inner race, an outer race and a plurality of roller elements disposed between the inner and outer races. A grease seal is disposed between the inner and outer races and spaced axially outward from the roller elements along an axis of the bearing assembly. The grease seal includes a rigid support structure and a flexible sealing member attached to the rigid support structure. The flexible sealing member includes at least one sealing lip, which contacts a surface of the inner race to provide a sealing engagement between the grease seal and the inner race, thereby retaining lubrication in an interior of the bearing from escaping at least to an interior of a crankcase of the engine and sealing at least the interior of the bearing against crankcase pressure variations in the engine.