Oil pump system
First Claim
1. 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; 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 a hydraulic pressure of the hydraulic oil within said first hydraulic passage, 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.
1 Assignment
0 Petitions
Accused Products
Abstract
An oil pump system includes an oil pump, a first hydraulic passage, a second hydraulic passage, a return hydraulic passage, and a control valve. When a revolving speed of a rotor of the oil pump is low, and when a hydraulic pressure of a hydraulic oil, discharged out of a first outlet port of the oil pump to the first hydraulic passage, is lower than a predetermined value, a valve body of the control valve is placed at a first position, thereby joining the hydraulic oil, flowing in the first hydraulic passage, with the hydraulic oil, discharged out of a second outlet port of the oil pump to the second hydraulic passage, and delivering the thus joined hydraulic oil to a hydraulic oil receiving unit via a hydraulic-oil-delivery passage. When the revolving speed of the rotor is high, and when the hydraulic pressure of the hydraulic oil, discharged out of the first outlet port to the first hydraulic passage, is higher than the predetermined value, the valve body is placed at a second position, thereby inhibiting the hydraulic oil from joining, and delivering only the hydraulic oil, discharged out of the first outlet port to the first hydraulic passage, to the aforementioned destination. The oil pump system is downsized and lightweighted advantageously, and is improved in terms of work efficiency and on-boardability.
42 Citations
13 Claims
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1. 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; 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 a hydraulic pressure of the hydraulic oil within said first hydraulic passage, 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. 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.
Specification