Oil pan

Abstract

An oil pan made from a resin material, the oil pan includes: a bottom wall; and side walls; the bottom wall including a plurality of ribs protruding from the outer wall surface, each of the ribs having; a base end portion protruding from the outer wall surface of the bottom wall, and having a tip end surface, and a tip end portion protruding from the tip end surface, the tip end portion being connected with the base end portion at a connection portion, the connection portion at which the base end portion and the tip end portion are connected with each other, which has a width that is equal to or smaller than a width of a portion at a base end position of the base end portion, and equal to or smaller than a width of a portion at a tip end position of the tip end portion.

1 . An oil pan made from a resin material, the oil pan comprising:
 a bottom wall having an outer wall surface; and   side walls surrounding the bottom wall, and defining, with the bottom wall, a space for storing a lubricating oil;   the bottom wall including a plurality of ribs protruding from the outer wall surface, each of the ribs having;
 a base end portion protruding from the outer wall surface of the bottom wall, and having a tip end surface, and 
 a tip end portion protruding from the tip end surface of the base end portion, the tip end portion being connected with the base end portion at a connection portion, 
 the connection portion at which the base end portion and the tip end portion are connected with each other, which has a width that is equal to or smaller than a width of a portion at a base end position of the base end portion, and equal to or smaller than a width of a portion at a tip end position of the tip end portion. 
   
     
     
         2 . The oil pan as claimed in  claim 1 , wherein the tip end portion of each of the ribs has a length longer than a length of the base end portion of the each of the ribs. 
     
     
         3 . The oil pan as claimed in  claim 1 , wherein each of the ribs has a T-shaped section; and a width of the base end portion of each of the ribs is greater than a width of the tip end portion of the each of the ribs. 
     
     
         4 . The oil pan as claimed in  claim 1 , wherein a distance between a pair of the ribs adjacent to each other is different from a distance between another pair of the ribs adjacent to each other; the base end portion of one of the ribs has a width different from a width of the base end portion of another of the ribs; and the tip end portion of one of the ribs has a width different from a width of the tip end portion of another of the ribs. 
     
     
         5 . The oil pan as claimed in  claim 1 , wherein the base end portion of each of the ribs has an isosceles trapezoid section; and the tip end portion of each of the ribs has an isosceles trapezoid section. 
     
     
         6 . The oil pan as claimed in  claim 1 , wherein each of the ribs includes a pair of tip end portions; the pair of the tip end portions of the each of the ribs are connected with the base end portion of the each of the ribs at connection portions; the connection portion of the each of the ribs between each of the pair of the tip end portions and the base end portion has a width which is equal to or smaller than the width of the portion at the base end position of the base end portion of the each of the ribs, and equal to or smaller than the width of the portion at the tip end position of the each of the par of the tip end portions of the each of the ribs. 
     
     
         7 . The oil pan as claimed in  claim 1 , wherein the tip end portion of each of the ribs is inclined by a predetermined angle. 
     
     
         8 . The oil pan as claimed in  claim 7 , wherein the tip end portions of the ribs protrude from the tip end surface of the base end portion to be inclined in the same direction. 
     
     
         9 . The oil pan as claimed in  claim 7 , wherein the tip end portions of the ribs adjacent to each other protrude to be inclined in opposite directions. 
     
     
         10 . The oil pan as claimed in  claim 9 , wherein the tip end portions of the ribs adjacent to each other have different lengths.