Structure of internal combustion engine

Abstract

A structure of an internal combustion engine is provided. The structure includes an oil pan connected to a main body portion of the internal combustion engine, and a plurality of baffle plates disposed in and fastened to the oil pan. In one embodiment, the oil pan includes a deep bottom portion for receiving oil and a shallow bottom portion. Among the plurality of baffle plates, the rigidity of a baffle plate disposed at the shallow bottom portion is higher than the rigidity of a baffle plate disposed at the deep bottom portion. In another embodiment, the oil pan includes a bottom portion for receiving oil, and a heavy-equipment joint portion disposed on a side portion of the oil pan. Among the plurality of baffle plates, the rigidity of a baffle plate disposed at the heavy-equipment joint portion is higher than the rigidity of another baffle plate.

What is claimed is: 
     
         1 . A structure of an internal combustion engine comprising:
 an oil pan connected to a main body portion of the internal combustion engine; and   a plurality of baffle plates disposed in and fastened to the oil pan.   
     
     
         2 . A structure of an internal combustion engine comprising:
 an oil pan connected to a main body portion of the internal combustion engine, the oil pan including a deep bottom portion for receiving oil and a shallow bottom portion, the deep bottom portion having a relatively deep depth and the shallow bottom portion having a relatively shallow depth; and   a plurality of baffle plates disposed in and fastened to the oil pan,   wherein among the plurality of baffle plates, a rigidity of a baffle plate disposed at the shallow bottom portion is higher than a rigidity of a baffle plate disposed at the deep bottom portion.   
     
     
         3 . A structure of an internal combustion engine comprising:
 an oil pan connected to a main body portion of the internal combustion engine; and   a plurality of baffle plates disposed in and fastened to the oil pan,   wherein the oil pan comprises a bottom portion for receiving oil, and a heavy-equipment joint portion disposed on a side portion of the oil pan, and   wherein among the plurality of baffle plates, a rigidity of a baffle plate disposed at the heavy-equipment joint portion is higher than a rigidity of another baffle plate.   
     
     
         4 . The structure according to  claim 2 , wherein the plurality of baffle plates consists of a first baffle plate having a relatively high rigidity and a second baffle pate having a low rigidity, and wherein the first baffle plate is made of an iron-based material and the second baffle plate is made of an aluminum-based material. 
     
     
         5 . The structure according to  claim 2 , wherein the plurality of baffle plates consists of a first baffle plate having a relatively high rigidity and a second baffle pate having a low rigidity, and wherein the second baffle plate has a clearance for a structural member. 
     
     
         6 . The structure according to  claim 2 , wherein the plurality of baffle plates consists of a first baffle plate having a relatively high rigidity and a second baffle pate having a low rigidity, and wherein a gap is formed between the first baffle plate and the second baffle plate. 
     
     
         7 . The structure according to  claim 2 , wherein the plurality of baffle plates consists of a first baffle plate having a relatively high rigidity and a second baffle pate having a low rigidity, and wherein the first baffle plate has a rib formed to connect fastening points for the oil pan. 
     
     
         8 . The structure according to  claim 7 , wherein the rib formed in the first baffle plate has a lightened portion. 
     
     
         9 . The structure according to  claim 3 , wherein the plurality of baffle plates consists of a first baffle plate having a relatively high rigidity and a second baffle pate having a low rigidity, and wherein the first baffle plate is made of an iron-based material and the second baffle plate is made of an aluminum-based material. 
     
     
         10 . The structure according to  claim 3 , wherein the plurality of baffle plates consists of a first baffle plate having a relatively high rigidity and a second baffle pate having a low rigidity, and wherein the second baffle plate has a clearance for a structural member. 
     
     
         11 . The structure according to  claim 3 , wherein the plurality of baffle plates consists of a first baffle plate having a relatively high rigidity and a second baffle pate having a low rigidity, and wherein a gap is formed between the first baffle plate and the second baffle plate. 
     
     
         12 . The structure according to  claim 3 , wherein the plurality of baffle plates consists of a first baffle plate having a relatively high rigidity and a second baffle pate having a low rigidity, and wherein the first baffle plate has a rib formed to connect fastening points for the oil pan. 
     
     
         13 . The structure according to  claim 12 , wherein the rib formed in the first baffle plate has a lightened portion.