Thrust bearing assembly for engine crankcase

A thrust bearing assembly, comprising:

• a main radial bearing including a pair of semicircular half bearings, each with a concave inner surface, a convex outer surface, and a pair of flange walls extending from the convex surface, the radial bearing configured to encircle a crankshaft in a crankshaft housing;
• and
• a thrust bearing including a semi-circular plate with a concave inner edge, a convex outer edge extending radially from the inner edge to form a thrust surface, a pair of holes positioned asymmetrically with reference to a central axis along the thrust surface, and parallel grooves on one face of the plate.

A thrust bearing assembly for a crankshaft, comprising:

• a radial bearing including a pair of semicircular half bearings, each with a respective concave inner surface, a convex outer surface, an alignment tab on the inner surface, and a flange wall extending from the convex surface, the pair of half bearings configured to encircle an outer surface of the crankshaft, journaled within a crankcase, via aligning of the alignment tabs;
• and
• a thrust bearing supporting a lower surface of the crankshaft, the thrust bearing including a semi-circular plate with a concave inner edge abutting the lower surface of the crankshaft, a convex outer edge extending radially from the inner edge to form a thrust surface, parallel grooves formed on the plate, and a pair of alignment holes positioned asymmetrically along the thrust surface relative to the parallel grooves.