Oil Pump

Abstract

An oil pump includes an inner rotor, an outer rotor, an outer ring, and a pump housing including a suction port and a discharge port, and including a first seal land formed between a terminal end section of the suction port and a start end section of the discharge port, and moreover including a rotor chamber that houses the inner rotor, the outer rotor, and the outer ring. In swing of an angle from an initial position to a final position of the outer ring, a final position eccentric axis connecting a rotation center of the inner rotor and a rotation center of the outer rotor is turnable in an area of an angle exceeding 90 degrees on the suction port side with respect to an initial position eccentric axis.

What is claimed is: 
     
         1 . An oil pump comprising:
 an inner rotor including outer teeth;   an outer rotor including inner teeth that form, together with the outer teeth, cells, and rotating while having a predetermined eccentricity amount with respect to a rotation center of the inner rotor;   an outer ring that swings, with respect to a rotation center of the inner rotor, a rotation center of the outer rotor along a track circle having the eccentricity amount as a radius; and   a pump housing including a suction port and a discharge port, and including a first seal land formed between a terminal end section of the suction port and a start end section of the discharge port, and moreover including a rotor chamber that houses the inner rotor, the outer rotor, and the outer ring, wherein   in swing of an angle from an initial position to a final position of the outer ring, a final position eccentric axis connecting the rotation center of the inner rotor and the rotation center of the outer rotor is turnable in an area of an angle exceeding 90 degrees on the suction port side with respect to an initial position eccentric axis.   
     
     
         2 . The oil pump according to  claim 1 , wherein, in the swing from the initial position to the final position of the outer ring, the final position eccentric axis connecting the rotation center of the inner rotor and the rotation center of the outer rotor is turnable in an area of an angle exceeding 90 degrees to an angle of 150 degrees on the suction port side with respect to the initial position eccentric axis. 
     
     
         3 . The oil pump according to  claim 1 , wherein, in the swing from the initial position to the final position of the outer ring, the final position eccentric axis connecting the rotation center of the inner rotor and the rotation center of the outer rotor is turnable in an area of an angle of 100 degrees to 140 degrees on the suction port side with respect to the initial position eccentric axis.