Patent ID: 7530438

Claim:
A drive train for a medium duty truck comprising: an engine having an engine output member; and a centrifugal clutch having a plurality of swing weights, a driving member generally defining an axis and rotatable with the engine output member, a ramp portion having a generally planar ramped surface portion in selective engagement with at least a portion of said swing weights, and a clutch disk portion for transferring torque from the driving member to a driven member, wherein said clutch is operable between an engaged condition and a disengaged condition, said swing weights are radially moveable with respect to said axis, radial movement of said swing weights selectively causes axial movement of at least a portion of said clutch between a disengaged position and an engaged position, and wherein said swing weights engage only said ramped surface portion of said ramp portion when said at least a portion of said clutch is not in the disengaged position.