Piston unit for hydraulic power cylinder, has metallic inner annular part maintained by projection on shaft or toothed rack, and outer annular part made of elastomer and joined to former part by projection

摘要

The unit (12) has a metallic inner annular part (21) maintained by a projection (24) on a shaft (11) or toothed rack (6), and forming a reduced thickness base. An outer annular part (22) made of elastomer, is joined to the part (21) by a projection (23). The part (22) has two annular sealing and scraping lips (26, 27) cooperating with an inner wall (28) of a body (10) of a hydraulic power cylinder (9).