Drive device with variable torque-limiting system

US5199538A · kind A · utility

Assignee

• Zahnradfabrik Friedrichshafen AG · DE

Inventors

• Manfred Fischer · Leichlingen, DE
• Alfred Magg · Friedrichshafen, DE

Key dates

• Filing date: Aug 22, 1991
• Grant date: Apr 6, 1993
• Expiry date: Aug 22, 2011

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16D2127/005
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A drive device with variable torque-limiting system. When a setting mechanism (17) forming part of a crank mechanism (23) is actuated in order to displace a carrier waggon (19) to which a hydrofoil component (2) is fastened, large forces are induced. To avoid excessive stresses on the components, the torque-limiter (15) is designed so that the drive torque is automatically variable within the limits of an adjustment range (88). The drive torque to be limited can, for example, be set at low values at the beginning and at the end of an oscillation path of the setting mechanism (17). The drive torque is varied by varying the preloading force of the spring assembly (47) of the torque-limiter (15). To this end, a comparator (74) detects the number of rotations of the output shaft (38) and varies the preloading force of the spring assembly (47).