Patent ID: 8122781

Claim:
A shear gear apparatus comprising: a rotating mating shear gear main body mounted on a rotational shaft and having a set of gear teeth extending axially and radially from the edge of the mating shear gear main body; and a static non-rotating bearing liner having a complementary set of gear teeth extending toward the mating shear gear main body gear teeth, said mating shear gear main body and said bearing liner being positioned in the same or proximate radial planes with both sets of gear teeth extending from both the mating shear gear main body and the bearing liner such that they will engage each other in the event of a displacement failure of the rotational shaft, imparting in the event of the displacement failure, a torque force to a shear section between the rotational shaft and the mating shear gear main body sufficient to cause shear section operation, and the complementary set of gear teeth extending radially from the bearing liner toward the mating shear gear main body, the complementary set of gear teeth including a set of recessed bearing liner gear teeth and a set of raised bearing liner gear teeth, wherein the set of raised bearing liner teeth and the set of recessed bearing liner teeth form a channel therebetween disposed to allow the mating shear gear main body's extended gear teeth to rotate within the channel.