Crank shaft for a multi-cylinder short stroke internal combustion engine

US4015485A · kind A · utility

Assignee

• Klockner-Humboldt-Deutz AG · DE

Inventors

• Karl Ganter-Ullmann
• Paul Neussel
• Hubert Abermeth · Cologne, DE
• Jurgen Wahnschaffe · Bensberg, DE
• Heiner Klier

Key dates

• Filing date: Jul 24, 1975
• Grant date: Apr 5, 1977
• Expiry date: Jul 24, 1995

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T74/2185
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A crank shaft for a multi-cylinder, short stroke internal combustion engine in which the diameters of the crank pin and of the shaft journal overlap each other, and in which the crank web decreases in thickness approximately from the center of the crank pin with increasing distance from the shaft center. In the crank webs within the region of the crank pin, relief bores are provided the axes of which are inclined with regard to the axis of said shaft journals. The relief bores are designed as blind bores with a flat bottom surface and with a circumferential surface merging with the flat bottom surface along a rounded surface section. The merging portion nearest to the area of the respective pertaining shaft journal is located approximately in the plane perpendicular to the longitudinal axis of the crank shaft and approximately in the middle between the crank pin and the shaft journal. With a diameter ratio of the crank pin to the shaft journal of about 0.8, the diameter of the relief bore corresponds to from 0.35 to 0.55 times the diameter of the shaft journal but at a maximum is so great that the overlapping of the respective relief bore with the outer contour of the respective ad…