| 摘要 |
A crankshaft and main bearing assembly for an internal combustion engine, includes: a crankshaft (1) with a first main bearing journal (10), a second main bearing journal (20), and one crankpin journal (110) parallel with, but radially spaced from and positioned between the first and second main bearing journals (10, 20). The first and second main bearing journals (10, 20), each have relevant first or second primary entrance openings (11, 21) in an outer surface for receiving fluid lubricant from the confronting first or second main bearing sleeves (210, 220). The one first crankpin journal (110) has a single exit opening (111) on an outer surface for supply of lubricant, in fluid communication with at least one of the primary entrance openings (11, 21). The main bearing journals (10, 20) on their outer surfaces each also have secondary entrance opening (12, 22) circumferentially spaced from the respective primary entrance openings (11, 21) and radially opposite thereto for also receiving fluid lubricant. The primary entrance opening (21) of the second main bearing journal (20) also is in an angularly spaced position with respect to the primary entrance opening (11) of the first main bearing journal (10), at an angle substantially greater than 0 degrees, but substantially less than 180 degrees. The secondary entrance openings (12, 22) are also in fluid communication with the single exit opening (111) of the one crankpin journal (110), and circumferential grooves of main bearing sleeves. |
