Patent ID: 7887309
Filing Date: 2011-02-15
Classification: F04C,F05C

Abstract:
1. An oil pump, for internal combustion engines having a pump case, the oil pump comprising: a pump lid, said pump lid comprising a lid collar; a pump flange; at least one planetary rotor set; at least one distance element; and a circular pump disc; wherein said planetary rotor set is arranged between said pump lid and said pump flange and comprises of a toothed wheelset; wherein said pump lid and said pump flange are connected to each other via said at least one distance element; wherein said pump disc is secured between said pump lid and said pump flange by said at least one distance element; wherein said lid collar extends adjacent to a circumference of said circular pump disc; wherein said distance element has a lower heat expansion coefficient than said pump lid, said pump flange, said toothed wheelset, and/or said pump disc; wherein the height of the distance element is greater than the height of the planetary rotor set and the height of the circular pump disc by a desired amount of end play; and wherein a maximum heat expansion of said circular pump disc is less than the difference in height between said distance element and said circular pump disc.