MOTOR DE COMBUSTION INTERNA, DE MOVIMIENTO RECIPROMOTOR DE COMBUSTION INTERNA, DE MOVIMIENTO RECIPROCO, CON CICLO DE DOS TIEMPOS, DE MULTIPLES CILINDRCO, CON CICLO DE DOS TIEMPOS, DE MULTIPLES CILINDROS. OS.

摘要

PCT No. PCT/AU92/00070 Sec. 371 Date Nov. 10, 1993 Sec. 102(e) Date Nov. 10, 1993 PCT Filed Feb. 21, 1992 PCT Pub. No. WO92/14920 PCT Pub. Date Sep. 3, 1992.A multi cylinder two stroke cycle internal combustion engine of known construction having an individual crankcase compartment for each cylinder 11 formed in a crankcase 12, the crankcase 12 including a wall 25,25 separating two adjacent crankcase compartments. A crankshaft 13 extends through the wall 25,26 with a journal 29 thereof supported in a bearing assembly 30 has an outer bearing ring 32 non-rotatably mounted in the wall 25,26. The outer bearing ring 32 has an axial extent greater than the thickness of the wall 25,26 to provide an internal annular surface co-axial with a shoulder 36 on the crankshaft that presents an opposing external annular surface to the internal annular surface of the bearing ring 32. A fluid seal is provided between the internal and external annular surfaces to prevent the passage of gas between the crankcase cavities.