Internal combustion engine

US5069176A · kind A · utility

Assignee

• AUDI AG · DE

Inventors

• Max Ruf · Obereisesheim, DE
• Erwin Korostenski · Oedheim, DE

Key dates

• Filing date: Nov 13, 1989
• Grant date: Dec 3, 1991
• Expiry date: Nov 13, 2009

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F05C2201/02
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In an internal-combustion engine, the light-metal cylinder head 1 is bolted together with the cylinder crankcase 2 by means of bolts 9, which extend in each case through a bore hole 10 in the cylinder head 1 and are bolted into a threaded borehole 11 in the cylinder crankcase 2. In order to keep the surface pressure, when the cylinder head bolts are tightened, at a level permissible for the light-metal alloy of the cylinder head 1 without using shims that require much space, a threaded sleeve 15 of steel, on the face 17 of which the head of the cylinder head bolt 9 is lying, is screwed into the borehole 10. The bearing surface for the force of the bolt is formed by the areas of the edges of the thread of the threaded sleeve 15. Accordingly, a sufficient area can be made available by an appropriate number of threads without the need to have the external diameter of the threaded sleeve 15 larger than the external diameter of the bolt head 12, 13.