Ball ramp inertia brake oil blocking ring

An inertia brake for slowing the rotation of a freely rotating shaft in a transmission comprising:

• a transmission case containing at least one transmission shaft and a plurality of transmission gears for changing a gear ratio in a vehicle driveline;
• an inertia brake housing attached to said transmission case having a cavity formed therein;
• a clutch pack disposed within said cavity having a plurality of driven plates nonrotatably linked to said transmission shaft and a plurality of stationary plates nonrotatably linked to said housing;
• a ball ramp mechanism for applying a compressive force on said clutch pack comprising:
• an actuation ring disposed adjacent to said clutch pack where axial movement of said actuation ring results in a loading and an unloading of said clutch pack;
• a control ring disposed opposite to said actuation ring, said control ring and said actuation ring having opposed faces provided with circumferentially extending grooves, said grooves comprised of at least three opposed pairs of grooves having portions of varying depth;
• and rolling members disposed one in each of opposed pair of said groves, said grooves formed in said actuation ring and said control ring being arranged so that relative angular movement of said actuation ring and said control ring from a starting position thereof, causes axial movement of said actuation ring away from said control ring to axially load said clutch pack;
• an electrical coil mounted within said housing;
• an armature electromagnetically attracted toward said coil for applying a braking torque to said control ring;
• a thrust plate separating a first and a second thrust bearing, said first thrust bearing axially pressing against said control ring and said second thrust bearing axially pressing against said housing;
• and
• a one-piece drive assembly rotatably driven by said rotating shaft through a transmission gear, said drive assembly having a gear section meshing with said transmission gear, a clutch section nonrotatably connected to said drive plates, an extension section coupled to said thrust plate and a bearing section for rotational support by said brake housing;
• a clutch cavity at least partially defined by said drive assembly, said clutch cavity sealed for maintaining oil contact with said clutch pack.