Oil pump

Abstract

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 including 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.

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,   wherein the reference line passes through respective central positions of the first partitioning section and the second partitioning section in a width direction during a low-speed rotation,   wherein the reference line rotates in a direction opposite to a direction of rotation of the inner rotor and the outer rotor, and passes through rear sides, in terms of the direction of rotation, of the respective central positions of the first partitioning section and the second partitioning section in the width direction during a high-speed rotation,   wherein 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 the low-speed rotation,   wherein 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,   wherein the protruding surface section is formed other than in the leading end section of the intake port,   wherein 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 the high-speed rotation,   wherein 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   wherein the protruding surface section is formed into a quadrangular shape.   
     
     
         2 . The oil pump according to  claim 1 , wherein the protruding surface section is formed in the trailing end section of the discharge port. 
     
     
         3 . The oil pump according to  claim 1 , wherein the protruding surface section is formed only in the trailing end section of the discharge port. 
     
     
         4 . The oil pump according to  claim 1 , wherein during the low-speed rotation before the rotation of the reference line and during the high-speed rotation after the rotation of the reference line, the space between teeth passes over the second partitioning section. 
     
     
         5 . The oil pump according to  claim 1 , wherein during the low-speed rotation before the rotation of the reference line and during the high-speed rotation after the rotation of the reference line, the space between teeth passes over the second partitioning section without connecting with the discharge port. 
     
     
         6 . The oil pump according to  claim 1 , wherein during the low-speed rotation before the rotation of the reference line and during the high-speed rotation after the rotation of the reference line, the space between teeth passes over the second partitioning section without connecting with the intake port. 
     
     
         7 . The oil pump according to  claim 1 , wherein the oil pump comprises an eccentric variable-capacity pump. 
     
     
         8 . 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,   wherein the reference line passes through respective central positions of the first partitioning section and the second partitioning section in a width direction during a low-speed rotation,   wherein the reference line rotates in a direction opposite to a direction of rotation of the inner rotor and the outer rotor, and passes through rear sides, in terms of the direction of rotation, of the respective central positions of the first partitioning section and the second partitioning section in the width direction during a high-speed rotation,   wherein 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 the low-speed rotation,   wherein 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,   wherein the protruding surface section is formed other than in the leading end section of the intake port,   wherein 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 the high-speed rotation,   wherein 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   wherein the protruding surface section is formed into a triangular shape.   
     
     
         9 . The oil pump according to  claim 8 , wherein the protruding surface section is formed in the trailing end section of the discharge port. 
     
     
         10 . The oil pump according to  claim 8 , wherein the protruding surface section is formed only in the trailing end section of the discharge port. 
     
     
         11 . The oil pump according to  claim 8 , wherein during the low-speed rotation before the rotation of the reference line and during the high-speed rotation after the rotation of the reference line, the space between teeth passes over the second partitioning section. 
     
     
         12 . The oil pump according to  claim 8 , wherein during the low-speed rotation before the rotation of the reference line and during the high-speed rotation after the rotation of the reference line, the space between teeth passes over the second partitioning section without connecting with the discharge port. 
     
     
         13 . The oil pump according to  claim 8 , wherein during the low-speed rotation before the rotation of the reference line and during the high-speed rotation after the rotation of the reference line, the space between teeth passes over the second partitioning section without connecting with the intake port. 
     
     
         14 . The oil pump according to  claim 8 , wherein the oil pump comprises an eccentric variable-capacity pump.