DRY DUAL CLUTCH TRANSMISSION ACTUATION SYSTEM USING ELECTRICAL MOTOR WITH FORCE AIDED LEVER

摘要

An actuation system for actuating a clutch piston of a transmission includes an actuator and a lever. A first end of the lever is attached to the actuator. The lever is pivotable about a lever connection location. Movement of the actuator rotates the lever about the lever connection location. A spring assembly is pivotable about a spring connection location, and pivotably connected to the lever at a second end of the lever. When the actuator is disposed in an un-actuated position, the spring assembly is positioned such that a pre-loaded spring force is directed along a zero moment path to generate a zero moment in the lever. When the actuator is disposed in an actuated position, the spring assembly is rotated so that the spring force is directed along a moment generating path in order to generate a moment in the lever to rotate the lever.

主权项

1. A transmission for a vehicle, the transmission comprising:
a housing; a dry clutch supported by the housing; a clutch piston supported by the housing and moveable in an axial direction between an engaged position for engaging the dry clutch and a disengaged position for disengaging the dry clutch; and an actuation system coupled to the clutch piston and operable to move the clutch piston from the disengaged position into the engaged position, the actuation system including:
an actuator moveable between an actuated position and an un-actuated position;a lever having a first end and a second end, wherein the first end of the lever is attached to the actuator, wherein the lever is attached to the housing at a lever connection location disposed between the first end and the second end of the lever, andwherein the lever includes a contact portion disposed between the lever connection location and the first end for engaging the clutch piston;wherein movement of the actuator from the un-actuated position into the actuated position rotates the lever about the lever connection location to bias the contact portion of the lever against the clutch piston and move the clutch piston from the disengaged position into the engaged position; anda spring assembly pivotably connected to the housing at a spring connection location, and pivotably connected to the lever at the second end of the lever, wherein the spring assembly is pre-loaded with a spring force directed outward away from the spring connection location;wherein the spring assembly is positioned relative to the lever such that the spring force is directed along a zero moment path extending between and intersecting the spring connection location and the lever connection location to generate a zero moment in the lever when the actuator is disposed in the un-actuated position; andwherein the spring assembly is positioned relative to the lever such that the spring force is directed along a moment generating path that does not intersect the lever connection location to generate a moment in the lever to rotate the lever about the lever connection location and bias the contact portion of the lever against the clutch piston to move the clutch piston from the disengaged position into the engaged position, when the actuator is disposed in the actuated position.