Patent ID: 9157436
Filing Date: 2015-10-13
Classification: F04C

Abstract:
1. An oil pump which changes an amount of fluid transferred from an intake port to a discharge port in one rotation, by causing a rotation of a reference line linking centers of rotation of an inner rotor and an outer rotor, the oil pump comprising: a pump housing in which a first partitioning section is formed between a trailing end section of the intake port and a leading end section of the discharge port, and a second partitioning section is formed between a trailing end section of the discharge port and a leading end section of the intake port, a width dimension of the second partitioning section is formed to be the same as or larger than a formation range of a space between teeth which is constituted by the inner rotor and the outer rotor passing the second partitioning section during a low-speed rotation, a protruding surface section is formed in a same plane as and continuously with the second partitioning section from a vicinity of an inner diameter side of the trailing end section of the discharge port, the protruding surface section is formed other than in the leading end section of the intake port, the protruding surface section and the second partitioning section are formed to be the same as or larger than the formation range of the space between teeth which passes the protruding surface section and the second partitioning section during a high-speed rotation, the space between teeth does not connect with the discharge port and the intake port above the second partitioning section, both before and after the rotation of the reference line; and the protruding surface section is formed into a shape following a path of a travel of a contact point between the teeth of the inner rotor and the outer rotor on a rear side in a direction of rotation of the inner rotor and the outer rotor when the space between teeth which is constituted by the inner rotor and the outer rotor passes the second partitioning section during high-speed rotation.