Patent ID: 7713041
Filing Date: 2010-05-11
Classification: F04C,F05C

Abstract:
1. An oil pump for internal combustion engines, the oil pump having a pump case including a pump lid, a pump flange, and a pump disc, the oil pump comprising: at least one planetary rotor set having a height and arranged between said pump lid and said pump flange; at least one distance element having a height and connected between said pump lid and said pump flange; and wherein said pump disc is secured between said pump lid and said pump flange by said distance element, and said pump disc has a different heat expansion coefficient than said planetary rotor set; wherein the height of said distance element is greater than the height of said planetary rotor set by a desired amount of end play; wherein said distance element has a lower heat expansion coefficient than said planetary rotor set; and wherein said distance element expands less than said planetary rotor set to reduce the end play when the temperature increases.