Oil pump system

An oil pump system, comprising:

• an oil pump including:
• a pump body defining a pump chamber therein;
• a rotor rotated by a driving source in the pump body;
• an inlet port sucking a hydraulic oil into the pump chamber as the rotor rotates;
• and
• an outlet port array having a first outlet port and a second outlet port at least, the first and second outlet ports discharging the hydraulic oil out of the pump chamber as the rotor rotates;
• a first hydraulic passage connecting a hydraulic-oil-delivery passage with the first outlet port of said oil pump, and delivering the hydraulic oil, coming from the first outlet port, to the hydraulic-oil-delivery passage, the hydraulic-oil-delivery passage delivering the hydraulic oil to a hydraulic oil receiving unit;
• a second hydraulic passage connecting the hydraulic-oil-delivery passage with the second outlet port of said oil pump, and delivering the hydraulic oil, coming from the second outlet port, to the hydraulic-oil-delivery passage;
• and
• a return hydraulic passage connected to said second hydraulic passage, and communicated with the inlet port of said oil pump;
• control means for outputting a control signal in responsive to at least one or a hydraulic-oil pressure in said first hydraulic passage, a hydraulic-oil temperature, an opening degree of a throttle valve, and a revolving speed of the driving source;
• and
• a control valve connected to said first hydraulic passage, said second hydraulic passage and said return hydraulic passage, the control valve including a valve body actuated in accordance with the control signal outputted by said control means, and the control valve being capable of switching the valve body between a first position and a second position;
• the first position joining said first hydraulic passage and said second hydraulic passage so as to join the hydraulic oil flowing in both of them, and delivering the joined hydraulic oil to the hydraulic-oil-delivery passage when the hydraulic pressure in said first hydraulic passage is lower than a predetermined value;
• the second position preventing said first hydraulic passage and said second hydraulic passage from joining, delivering the hydraulic oil flowing in said first hydraulic passage to the hydraulic-oil-delivery passage, and returning the hydraulic oil flowing in said second hydraulic passage to said return hydraulic passage when the hydraulic pressure in said first hydraulic passage is higher than the predetermined value.