Planetary gear

US5910066A · kind A · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Horst Schulz · Friedrichshafen, DE
• Bernd Somschor · Tettnang, DE

Key dates

• Filing date: Aug 22, 1997
• Grant date: Jun 8, 1999
• Expiry date: Aug 22, 2017

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2057/128
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A planetary gear having step planet gears is generically a Wolfrom gear which permits large ratios. Transmission of this type are used mainly in the handling technology. In order to improve the portability, friction, vibration and noise characteristics, step planet gears with separate toothed regions of the step gears are used. The modules of the step gears are graduated. The number of teeth is identical. Each of the teeth engagements with the ring gears can be optimized. The teeth on the step gears are preferably honed.