Plunger piston for internal combustion engines

US4704950A · kind A · utility

Assignee

• Mahle GmbH · DE

Inventors

• Emil Ripberger · Waiblingen, DE
• Gotthard Stuska · Fellbach, DE
• Reiner Ulrich · Rutesheim, DE

Key dates

• Filing date: Feb 17, 1987
• Grant date: Nov 10, 1987
• Expiry date: Feb 17, 2007

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F05C2201/0448
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An extremely light and low friction plunger piston for internal combustion engines, particularly Otto-type engines for private cars. The piston has the following ratios and dimensions EQU (H/D)=0.20-0.35 EQU (T/D)=0.22-0.38 EQU (A/D)=0.15-0.25 EQU (B/D)=(A/D) wherein PA1 D=piston diameter PA1 H=compression height between a top of the head and the gudgeon pin bore axis PA1 T=distance from the radially outer boss faces to the piston axis PA1 A=axial skirt dimension below annular groove nearest the pin bore axis at a peripheral zone of the skirt extending over an angle .alpha. of 15 to 60 degrees to either side of a connecting rod oscillating plane PA1 B=axial skirt dimension below said annular groove in a direction along said gudgeon pin axis; and further wherein the distal end of the skirt is reduced radially over an axial dimension of 10-25% of an axial length of the skirt in said direction along said gudgeon pin axis, said distal end being reduced at its edge by 0.01-0.15 mm.