Continuously variable transmission with integrated torque sensor
AssigneeLuK Lamellen und Kupplungsbau Beteiligungs KG
InventorJochen Schmid
Life of this patent
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Abstract
A continuously variable transmission including two pairs of conical disks of which one disk of each pair is axially movable toward and away from the other disk and having an endless loop member in the form of a belt that passes around each pair of disks and transfers torque between the pairs of disks. The axially movable conical disk includes a contact pressure chamber to move the disk axially by the application of hydraulic pressure. The movable disk also includes an integrated torque sensor that is operative for controlling the contact pressure between the disks of a pair of disks and the endless loop member as a function of the torque.
Claims12
A continuously variable transmission including a pair of side-by-side conical disks for transmitting torque, wherein one of the disks is axially movable relative to the other disk in response to a contact pressure applied through a pressure chamber associated with the movable disk, said transmission comprising:
- a torque sensor that influences the contact pressure in the pressure chamber, wherein the torque sensor includes balls that are positioned between a pair of cam surfaces that are formed on components that are movable relative to each other and that transmit a torque that acts on the movable disk;
- guide surfaces carried by the movable conical disk and that receive the balls between them and guide the balls radially so that as the position of the movable disk is adjusted the components carrying the cam surfaces move relative to each other as a result of movement of the balls along the guide surfaces, to thereby adjust the contact pressure;
- wherein at least one guide surface includes at least one raised portion to define a ramp so that a component of an adjustment force Fv that operates on the balls in a circumferential plane passes through the center of the balls and substantially coincides with lines of application of force components F1′ and F2′ of forces F1 and F2 that are imposed on the balls by the cam surfaces.
Dependencies are inferred from the claim text.