Continuously variable speed transmission

US5217412A · kind A · utility

Assignee

• LUK Lamellen Und Kupplungsbau · US

Inventors

• Norbert Indlekofer · Bühl, DE
• Oswald Friedmann · Lichtenau, DE

Key dates

• Filing date: Jan 31, 1992
• Grant date: Jun 8, 1993
• Expiry date: Jan 31, 2012

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2061/66286
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A continuously variable speed transmission wherein an input member is driven by an engine through a torque sensor and the input member drives an output member at a selected RPM through a pair of adjustable sheaves and an endless belt or chain which is trained over the sheaves. Each sheave has a fixed flange and an axially movable flange. The movable flanges can be shifted by hydraulic motors, and the pressure of fluid in such motors is determined by torque which is detected by the sensor as well as by the selected ratio of the transmission. The device which controls the pressure of fluid in the motors in dependency on the magnitude of torque and in dependency on the selected transmission ratio employs a pressure regulating valve which is connected with the torque sensor and with the motors and which is adjustable in automatic response to variations of transmission ratio.