Self-adjusting hydraulic valve tappet

US4721076A · kind A · utility

Assignee

• INA-WALZLAGER SCHAEFFLER KG · DE

Inventors

• Dieter Goppelt · Herzogenaurach, DE
• Dieter Schmidt · Steinhagen, DE

Key dates

• Filing date: Nov 14, 1986
• Grant date: Jan 26, 1988
• Expiry date: Nov 14, 2006

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F01L1/25
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A self-adjusting hydraulic valve tappet arranged in a guide bore of a cylinder head of an ice being located between a cam of a cam shaft and an end of a valve stem, the tappet comprising a cup shaped housing (1) closed at one end by an end member (3) against the outside of which the cam abuts and a cylindrical guide sleeve (6) concentric with a cylindrical wall (2) and arranged at its end away from member (3) in the center of an annular flange element (5) which at its outer circumference merges into the cylindrical wall (2) of the housing (1) and guide sleeve (6) is spaced at an opposite end from end member (3), a self-adjusting hydraulic play compensating element (10) being guided for longitudinal movement in the guide sleeve (6) comprising an inner piston (12) and an outer piston (11), the two pistons telescoping and defining oil pressure chamber (22) which communicates through a bore in the inner piston (12) closed by a check valve (21) with a central oil reservoir (13) disposed in inner piston (12), the outer piston (11) being mounted in the guide sleeve (6) and abutting at its closed end against the end of the valve stem, an annular oil reservoir (20) which is supplied with oi…