Control system for an infinitely variable speed friction drive

• US 3,280,646 A
• Filed: 02/02/1966
• Issued: 10/25/1966
• Est. Priority Date: 02/02/1966
• Status: Expired due to Term

• Current Assignee: George E. Lemieux
• Original Assignee: George E. Lemieux
• Inventors: Lemieux, George E.
• Application Number:
  US04/533,752
• Time in Patent Office: 265 Days
• US Class Current: 477/50
• CPC Class Codes: F16H 61/6648 controlling of shifting being influenced by a signal derived from the engine and the main coupling
• CPC Class Codes: Y10S 74/02 Miscellaneous control systems, e.g. ship propulsion, machine tools

Claims

1. A CONTROL CIRCUIT FOR A FRICTION DRIVE TRANSMISSION HAVING A PAIR OF RADIALLY SPACED RACES AT LEAST ONE OF WHICH IS ROTATABLE RELATIVE TO THE OTHER, SAID RACES ENCLOSING A RADIALLY ADJUSTABLE ROLLING ELEMENT FRICTIONALLY ENGAGED THEREBETWEEN, EACH OF SAID RACES HAVING AXIALLY SPACED AND CONNECTED ELEMENTS SLIDABLE TOWARDS OR AWAY FROM EACH OTHER TO RADIALLY MOVE SAID ROLLING ELEMENT AND EFFECT A CHANGE IN THE DRIVE RATIO OF SAID TRANSMISSION, INCLUDING, IN COMBINATION, FLUID PRESSURE SERVO MEANS ASSOCIATED WITH EACH OF SAID RACES FOR CLAMPING SAID ELEMENTS TOGETHER FOR TRANSMITTING A DRIVE THROUGH SAID TRANSMISSION, A SOURCE OF FLUID UNDER PRESSURE, CONDUIT MEANS CONNECTING SAID SOURCE AND EACH OF SAID SERVO MEANS, AND FLUID PRESSURE CONTROL MEANS IN SAID CONDUIT MEANS MOVABLE TO VARY THE LEVEL OF THE FLUID PRESSURE DIRECTED TO EACH OF SAID SERVO MEANS UPON A CHANGE IN THE FLUID PRESSURE TO ONE OF SAID SERVO MEANS.