Planetary gear

US6220984A · kind A · utility

Assignee

• 2F Friedrichshafen AG · DE

Inventors

• Horst Schulz · Friedrichshafen, DE
• Jurgen Pescheck · Markdorf, DE

Key dates

• Filing date: Sep 27, 1999
• Grant date: Apr 24, 2001
• Expiry date: Sep 27, 2019

Classification

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

Abstract

The planetary gear according to the invention comprises a sun gear (2) connected to a driven central shaft (20), a ring gear (12), a group of first stepped planetary gears (8, 10) and a group of second stepped planetary gears (4, 6). The large step wheels (4) of the second stepped planetary gears engage the sun gear (2), the small step wheels (6) of the second stepped planetary gears simultaneously engage a pair of adjoining large step wheels (8) of the first stepped planetary gears and all small step wheels (10) of the first stepped planetary gears engage the ring gear (12). The gear allows for high transmission ratios having a small size and low inertia moment and offers excellent properties in relation to efficiency and transmission reliability.