Steplessly adjustable belt-type transmission

US4738651A · kind A · utility

Assignee

• Deere & Company · US

Inventors

• Serge Favache · Zweibrücken, DE
• Bernd Kempf · Alzenau, DE
• Karl Rabung · Gersheim, DE

Key dates

• Filing date: Nov 21, 1986
• Grant date: Apr 19, 1988
• Expiry date: Nov 21, 2006

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2009/166
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

An infinitely variable belt-type transmission for an agricultural machine or the like includes drive and driven pulleys and a pair of inversely variable diameter pulleys mounted on a shaft that is shiftable to vary the diameter of the pulleys and consequently the drive ratio of the transmission. The inner halves of the adjacent variable diameter pulleys are drivingly connected through a cam that exerts a force on the inner pulley halves tending to increase the pulley diameters and thereby increase the belt tension in response to an increase in torque transmitted through the transmission, and the shiftable pulley half on at least one of the pulleys is splined to its mating half so that the shifting movement in response to the torque increase results only in axial motion of the shiftable pulley half.