Oil Pump for Vehicle

Abstract

A hydraulic pump for a vehicle includes a pump housing, an inlet port formed to the pump housing, a chain cover combined with the pump housing and forming an outlet port with the pump housing, and a rotor provided between the pump housing and the chain cover and having a predetermined thickness, the rotor including an inner gear and an outer gear. The outlet port includes a center port having the same thickness as the rotor, a housing port formed to the pump housing and having a first depth and a cover port formed to the chain cover and having a second depth, and a sum of the first depth and the second depth is 50% to 60% of the thickness of the rotor.

What is claimed is: 
     
         1 . A hydraulic pump for a vehicle comprising:
 a pump housing;   an inlet port formed to the pump housing;   a chain cover combined with the pump housing and forming an outlet port with the pump housing; and   a rotor provided between the pump housing and the chain cover and having a predetermined thickness, the rotor comprising an inner gear and an outer gear;   wherein the outlet port includes a center port having the same thickness as the rotor, a housing port formed to the pump housing and having a first depth and a cover port formed to the chain cover and having a second depth; and   wherein a sum of the first depth and the second depth is 50% to 60% of the thickness of the rotor.   
     
     
         2 . The hydraulic pump of  claim 1 , wherein a ratio of the first depth to the second depth is between 2:1 and 3:1. 
     
     
         3 . The hydraulic pump of  claim 2 , wherein the outlet port is formed inclined in a direction of the inlet port at an end. 
     
     
         4 . The hydraulic pump of  claim 1 , wherein:
 the inner gear and the outer gear form a plurality of pockets;   a notch is configured to communicate with the outlet port and is formed in the pump housing; and   a formation position of the notch is an angle corresponding to the pocket from the inlet port toward the outlet port and a position that is 5 degrees to 10 degrees apart based on a center of the rotor.   
     
     
         5 . The hydraulic pump of  claim 4 , wherein the end of the outlet port is formed at 100 degrees to 120 degrees from the formation position of the notch based on the center of the rotor. 
     
     
         6 . The hydraulic pump of  claim 5 , wherein:
 a slope is formed between an end of the notch and the outlet port; and   the slope is formed in a 30 degree to 60 degree angle.   
     
     
         7 . The hydraulic pump of  claim 4 , wherein a length of the notch is 10 degrees to 15 degrees from the formation position of the notch based on the center of the rotor. 
     
     
         8 . The hydraulic pump of  claim 4 , wherein a depth of the notch is 2% to 5% of the thickness of the rotor. 
     
     
         9 . A hydraulic pump for a vehicle comprising:
 a pump housing;   an inlet port formed to the pump housing;   a chain cover combined with the pump housing and forming an outlet port with the pump housing; and   a rotor provided between the pump housing and the chain cover and having a predetermined thickness, the rotor comprising an inner gear and an outer gear;   wherein a notch is configured to communicate with the outlet port and is formed in the pump housing; and   wherein a slope is formed between an end of the notch and the outlet port.   
     
     
         10 . The hydraulic pump of  claim 9 , wherein:
 the outlet port includes a center port having the same thickness as the rotor, a housing port formed to the pump housing and having a first depth, and a cover port formed to the chain cover and having a second depth; and   a sum of the first depth and the second depth is 50% to 60% of the thickness of the rotor.   
     
     
         11 . The hydraulic pump of  claim 10 , wherein a ratio of the first depth and the second depth is 2:1 to 3:1. 
     
     
         12 . The hydraulic pump of  claim 10 , wherein:
 the inner gear and the outer gear form a plurality of pockets; and   a formation position of the notch is an angle corresponding to the pocket from the inlet port toward the outlet port and a position that is 5 degrees to 10 degrees apart based on a center of the rotor.   
     
     
         13 . The hydraulic pump of  claim 12 , wherein an end of the outlet port is formed at loo degrees to 120 degrees from the formation position of the notch based on the center of the rotor. 
     
     
         14 . The hydraulic pump of  claim 13 , wherein a length of the notch is 10 degrees to 15 degrees from the formation position of the notch based on the center of the rotor. 
     
     
         15 . The hydraulic pump of  claim 13 , wherein a depth of the notch is 2% to 5% of the thickness of the rotor. 
     
     
         16 . The hydraulic pump of  claim 13 , wherein the slope is formed in a 30 degree to 60 degree angle. 
     
     
         17 . A vehicle comprising:
 a vehicle body;   a pump housing for a hydraulic pump mounted in the vehicle body;   an inlet port formed to the pump housing;   a chain cover combined with the pump housing and forming an outlet port with the pump housing; and   a rotor having a thickness and provided between the pump housing and the chain cover, the rotor comprising an inner gear and an outer gear;   wherein the outlet port includes a center port having the same thickness as the rotor, a housing port formed to the pump housing and having a first depth, and a cover port formed to the chain cover and having a second depth; and   wherein a sum of the first depth and the second depth is 50% to 60% of the thickness of the rotor and a ratio of the first depth and the second depth is 2:1 to 3:1;   wherein a notch configured to communicate with the outlet port is formed in the pump housing; and   wherein a slope is formed between an end of the notch and the outlet port.   
     
     
         18 . The vehicle of  claim 17 , wherein:
 the inner gear and the outer gear form a plurality of pockets; and   a formation position of the notch is an angle corresponding to the pocket from the inlet port toward the outlet port and a position that is 5 degrees to 10 degrees apart based on a center of the rotor.   
     
     
         19 . The vehicle of  claim 18 , wherein:
 an end of the outlet port is formed at loo degrees to 120 degrees from the formation position of the notch based on the center of the rotor;   a length of the notch is 10 degrees to 15 degrees from the formation position of the notch based on the center of the rotor; and   a depth of the notch is 2% to 5% of the thickness of the rotor.   
     
     
         20 . The hydraulic pump of  claim 19 , wherein the slope is formed in a 30 degree to 60 degree angle.