| 摘要 |
<p>An automotive internal combustion engine (10) comprises a cylinder block (12) having a plurality of bearing sections (22), and a bearing beam structure (26) secured to the bottom part of the cylinder block. The bearing beam structure (26) includes a plurality of main bearing cap sections (28) each of which associates with each cylinder block bearing section (22) to rotatably support the journal of a crankshaft. First and second beam sections (32A.32B) are formed at the upper corner portions of each bearing cap section (28) to securely connect the bearing cap sections with each other. Additionally, first and second side wall sections (36A,36B) are respectively formed along the opposite side portions of each bearing cap section (28) to securely connect the bearing cap sections with each other. The first and second side wall sections (36A,36B) are integral with the first and second beam sections, respectively. Therefore, vibration of the bearing beam structure (26) and the cylinder block (12) can be effectively suppressed, thereby achieving total engine noise reduction.</p> |
