Adjustable camshaft

US9903240B2 · kind B2 · utility

Assignee

• Mahle International GmbH · DE

Inventors

• Patrick Altherr · Stuttgart, DE
• Rolf Kirschner · Eßlingen, DE

Key dates

• Filing date: Dec 4, 2015
• Grant date: Feb 27, 2018
• Expiry date: Mar 14, 2036

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An adjustable camshaft of an internal combustion engine may include an outer shaft and an inner shaft arranged coaxially to the outer shaft and rotatable over a predefined angle. At least one first cam may be connected rotationally fixedly to the inner shaft. A second cam may be arranged beside the first cam and may be connected rotationally fixedly to the outer shaft. The first cam and the second cam may each be operatively associated with a common valve. Rotation of the first cam relative to the second cam may impart an extension of a valve opening time of the valve. The first cam and the second cam may each include an identical circular segment section in an elevated region of valve lift. The circular segment section of the first cam and the second cam may merge without interruptions during rotation about the predefined angle range.