| 摘要 |
A bearing cap (11) fastened to a bulkhead (2) of a cylinder block (1) by bolts to support a crankshaft. A pair of protruding parts (25, 26) that enlarge a joint surface (12) between the bearing cap (11) and the bulkhead (2) in a transverse direction of the crankshaft are formed respectively in a pair of side surfaces (33, 34). A pair of reinforcing parts (35, 36) are positioned between a top surface (19) and the pair of protruding parts (25, 26), protrude from the pair of side surfaces (33, 34) in the transverse direction of the crankshaft, and have a protrusion length that is smaller than that of the pair of protruding parts (25, 26). The stress on the joint portion between the bearing cap (11) and the bulkhead (2) generated by the crankshaft during operation of the internal combustion engine is thereby reduced. |
| 主权项 |
1. A bearing cap fixed to a bulkhead of a cylinder block by bolts and supporting a crankshaft so as to be free to rotate, comprising:
a joint surface with the bulkhead; a top surface located on an opposite side of the joint surface; a pair of side surfaces connecting the joint surface and the top surface; a pair of protruding parts that protrude respectively from the pair of side surfaces to enlarge the joint surface in a transverse direction of the crankshaft; a pair of reinforcing parts located between the pair of protruding parts and the top surface, the pair of reinforcing parts protruding from the pair of side surfaces in the transverse direction of the crankshaft and having a protrusion length that is smaller than a protrusion length of the pair of protruding parts, and a pair of rounded portions formed between the pair of protruding parts and the pair of reinforcing parts, the pair of rounded portions protruding from the pair of side surfaces in the transverse direction of the crankshaft and having a protrusion length that is smaller than the protrusion length of the pair of protruding parts and greater than the protrusion length of the pair of reinforcing parts, wherein the pair of side surfaces, the pair of protruding parts, the pair of rounded portions, and the pair of reinforcing parts are all formed on the outside of the bolts, the pair of reinforcing parts are symmetrical with respect to a center axis of the bearing cap, and the pair of reinforcing parts, the pair of rounded portions, and the pair of protruding parts are formed integrally with the bearing cap, such that a first reinforcing part of the pair of reinforcing parts, a first rounded portion of the pair of rounded portions, and a first protruding part of the pair of protruding parts are formed on a first side surface of the pair of side surfaces adjacent to each other, and a second reinforcing part of the pair of reinforcing parts, a second rounded portion of the pair of rounded portions, and a second protruding part of the pair of protruding parts are formed on a second side surface of the pair of side surfaces adjacent to each other. |
