Oil-pressure supply device

An oil-pressure supply device for supplying hydraulic oil from an oil storage portion to a friction element or a torque converter of an automatic transmission for a vehicle, the oil-pressure supply device comprising:

• an oil-pressure control portion which controls a pressure of the hydraulic oil supplied to the friction element or the torque converter;
• a mechanical pump driven by an engine, the mechanical pump having a suction port through which the hydraulic oil is drawn from the oil storage portion, and a discharge port through which the hydraulic oil is discharged to the oil-pressure control portion;
• an electric pump driven by a motor, the electric pump having a suction port through which the hydraulic oil is drawn from the oil storage portion, and a discharge port through which the hydraulic oil is discharged to the oil-pressure control portion;
• a first filtration portion which traps foreign materials contained in the hydraulic oil drawn from the oil storage portion into the suction port of the mechanical pump;
• a second filtration portion which traps foreign materials contained in the hydraulic oil drawn from the oil storage portion into the suction port of the electric pump;
• a first branch passage branching from an oil passage that connects the suction port of the mechanical pump and the first filtration portion;
• a second branch passage branching from an oil passage that connects the suction port of the electric pump and the second filtration portion;
• a third branch passage branching from an oil passage that connects the discharge port of the electric pump and the oil-pressure control portion;
• a fourth branch passage through which the hydraulic oil surplus in operation of the friction element or the torque converter is discharged;
• and
• a switching portion configured to be set at a first position where the switching portion connects the first branch passage to the third branch passage and separates the second branch passage from the fourth branch passage, or be set at a second position where the switching portion connects the second branch passage to the fourth branch passage and separates the first branch passage from the third branch passage, wherein
• the switching portion is set at the first position when the foreign materials trapped by the first filtration portion are removed in a recovery of the first filtration portion, and
• the switching portion is set at the second position when the foreign materials trapped by the second filtration portion are removed in a recovery of the second filtration portion.