Method for making a cylinder

US7159314B2 · kind B2 · utility

Assignee

• Andreas Stihl AG & Co. KG · DE

Inventors

• Klaus Bröckel · São Leopoldo, BR
• Hartmut Fischer · Hofheim, DE
• Heiko Rosskamp · Adelberg, DE
• Helmar Amend · Waiblingen, DE
• Igor Klaric · Bad Marienberg, DE

Key dates

• Filing date: Sep 22, 2003
• Grant date: Jan 9, 2007
• Expiry date: Sep 2, 2024

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49995
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A cylinder housing (1) is cast with a cylinder wall (2) in the making of a cylinder for an internal combustion engine. The cylinder wall delimits an interior space (3) for accommodating a reciprocating piston and, thereafter, a control window (5) is machined into the cylinder wall (2) as an opening of a transfer channel (4) into the interior space (3). A two-stage machining for forming the control window (5) is provided in order to make possible a rapid and cost effective manufacture of the cylinder. In a first step with a work tool (7) having a rotating primary movement (11), a breakthrough (10) is machined into the cylinder wall (2) and, in a second step with a work tool, the breakthrough (10) is widened to the wanted dimensions of the control window (5).