Transmission inertia brake with ball ramp actuation

摘要

In a transmission inertia brake (4) a ball ramp mechanism (8) is used to load a clutch pack (10) to slow a rotating transmission shaft where the clutch pack (10) is carried on a one piece drive assembly (86) having a gear section (86A) for meshing with a transmission gear, an extension section (86B) for engaging a thrust plate (32) in an isolator assembly (34), a clutch section (10) for engaging plurality of driven clutch plates (40) in the clutch pack (10) and a bearing section (86D) for rotational support within a brake housing (38). An armature (16) having an angled peripheral surface engages a mating friction surface formed in an end plate (14) to form a core clutch (18), the armature (16) being magnetically pulled upon energization of an electrical coil (12) energized by a power signal from a control unit (45) supplied through a sealed electrical connector (70) thereby introducing a frictional braking force on the armature (16) to activate the ball ramp mechanism (8). The armature (16) is nonrotatably connected to the control ring (26) of the ball ramp mechanism (8) through at least one connecting pin (48). A Belleville spring (68) is used to apply an axial load on the ball ramp mechanism (8) and to drive the star (92) in a gerotor oil pump (88) which interacts with a ring (90) to pump cooling lubricant throughout the clutch pack (10) in the ball ramp mechanism (8).