Variable valve train of an internal combustion engine

US7392777B2 · kind B2 · utility

Assignee

• Schaeffler KG · DE

Inventors

• Christof Faria · Erlangen, DE
• Frank Himsel · Herzogenaurach, DE

Key dates

• Filing date: Aug 17, 2006
• Grant date: Jul 1, 2008
• Expiry date: Dec 16, 2026

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T74/2107
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The invention proposes a variable valve train (1) for a gas exchange valve (8) of an internal combustion engine, which gas exchange valve (8) is actuated by a cam (2), said valve train (1) comprising a force transmission device (4) that is arranged between the cam (2) and the gas exchange valve (8) and includes a hydraulic lifting device (9) comprising a pressure piston (10) that is arranged for longitudinal displacement in a cylinder (12), said pressure piston (10) defining a pressure chamber (13) that is connected to a pressure medium supply of the internal combustion engine and said pressure piston (10) permitting, under high-pressure loading, an actuation of the gas exchange valve (8) independently of the cam (2). The force transmission device (4) is configured as an oscillating lever or rocker arm (3) mounted for pivoting on a lever shaft (6) comprising a longitudinal channel (14) that transports pressure medium and acts as a link (15) between the pressure medium supply and the pressure chamber (13).