Patent ID: 6190274
Filing Date: 2001-02-20
Classification: F16H

Abstract:
An infinitely variable cone-pulley transmission with means for switching a pressure compartment on and off dependent on the transmission ratio, comprisinga shaft having a pair of conical disks including a movable conical disk attached in a manner that prevents rotational but permits axial relative movement and a fixed conical disk solidly attached,a pressure chamber formed between the movable conical disk and a ring-shaped component that is solidly attached to the shaft,a first pressure compartment formed between the side of the ring-shaped component that faces away from the pressure chamber and a ring-shaped, piston-like part that is axially movable relative to the shaft and is acted upon by a force whose magnitude depends on the magnitude of the torque acting on the shaft, anda second pressure compartment formed, likewise, between the ring-shaped component and the piston-like part,wherein the first pressure compartment is connected to a pump and has an outlet channel that is closed off by the piston-like part to an increasing degree when there is an increase in the torque,the movable conical disk has inner and outer centering guide portions sliding in tight contact along the surface of the shaft and interacting with channel openings in the circumference of the shaft to form a valve arrangement which, through channels formed in the shaft, connects the second pressure compartment to a space outside of the shaft when a distance between the conical disks is large and which connects the second pressure compartment with the pressure chamber when the distance between the conical disks is small, andthe shaft includes an oblique bore hole that runs through the shaft at an oblique angle from a location on the circumference of the shaft connected with the second pressure compartment and a tap hole leading into the oblique bore hole, said oblique bore hole being connected to the space outside of the shaft and the tap hole being closed off when the distance between the conical disks is large, and said oblique bore hole being blocked and the tap hole being connected to the pressure chamber when the distance between the conical disks is small.