Cylinder head for internal-combustion engines

US6053141A · kind A · utility

Assignee

• Daimlerchrysler AG · US

Inventors

• Martin Mutterer · Leutenbach, DE
• Eckhart Nitzschke · Stuttgart, DE
• Tilmann Roemheld · Waiblingen, DE
• Willy Treyz · Neckartailfingen, DE

Key dates

• Filing date: Dec 22, 1997
• Grant date: Apr 25, 2000
• Expiry date: Dec 22, 2017

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02F2200/06
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A cast cylinder head for an internal-combustion engine, in which the charge cycle ducts have a fluctuating duct offset relative to the valve opening caused by the casting technique. Proximate the opening, the charge cycle ducts are provided with a machining allowance which increases toward the duct end and are machined there in a cutting manner so that the interior surface of the charge cycle ducts changes in each case without an offset into the valve opening. In order to achieve a simple tool guiding and nevertheless a machining which is advantageous to the flow, a compensating groove is arranged in the machining allowance of the charge cycle ducts which has a flat V-shaped cross-section and extends in the circumferential direction, specifically--relative to the flow direction--at least in the area of a convex course of the duct wall. The groove flanks have a convex cross-section and are curved to be as free of flow separations as possible. The compensating groove extends at a distance above the upper edge of the valve seat ring which corresponds to approximately 20 to 30% of the inside diameter of the valve opening. The groove base is situated outside the ideal course of the duct…