Oil supply device

Abstract

An oil supply device includes: an oil pump; an oil supply flow passage through which oil discharged from the oil pump flows; and an air mixing portion that cools a cooling object by mixing air into the oil supplied to the oil supply flow passage and supplying the oil mixed with the air to the cooling object.

What is claimed is: 
     
         1 . An oil supply device comprising:
 an oil pump;   an oil supply flow passage through which oil discharged from the oil pump flows; and   an air mixing portion that cools a cooling object by mixing air into the oil supplied to the oil supply flow passage and supplying the oil mixed with the air to the cooling object.   
     
     
         2 . The oil supply device according to  claim 1 , wherein
 the oil supply flow passage includes a lubrication flow passage that supplies the oil to a lubrication portion, and a cooling flow passage that is provided to be branched from the lubrication flow passage and supplies the oil to the cooling object, and   the air mixing portion is disposed in the cooling flow passage.   
     
     
         3 . The oil supply device according to  claim 2 , wherein
 the air mixing portion is disposed in an end portion on a downstream side of the cooling flow passage.   
     
     
         4 . The oil supply device according to  claim 2 , wherein
 a plurality of the cooling flow passages are provided to be branched from the lubrication flow passage, and   the air mixing portion is disposed on the downstream side of a branch position from the lubrication flow passage and on an upstream side of a branch position of the plurality of cooling flow passages.   
     
     
         5 . The oil supply device according to  claim 2 , wherein
 the oil supply flow passage includes a first branch position and a second branch position, the first branch position branches the lubrication flow passage and the cooling flow passage, the second branch position branches the single cooling flow passage to the plurality of cooling flow passage, and   the air mixing portion is disposed downstream of the first branch position and upstream of the second branch position.   
     
     
         6 . The oil supply device according to  claim 1 , further comprising:
 an oil pan that stores the oil; and   an air separating portion that separates the air from the oil containing the air that has returned to the oil pan after being supplied to the cooling object.   
     
     
         7 . The oil supply device according to  claim 2 , wherein
 the cooling flow passage includes a combustion chamber cooling flow passage through which the oil for cooling at least one of a cylinder head, a cylinder, and a piston of an engine that serves as at least the cooling object flows, and   the air mixing portion is disposed in the combustion chamber cooling flow passage.   
     
     
         8 . The oil supply device according to  claim 6 , wherein
 the air separating portion is configured with the oil pump, and   the oil pump separates the air from the oil containing the air that has returned to the oil pan after being supplied to the cooling object by the air mixing portion, and supplies the oil from which the air is separated.   
     
     
         9 . The oil supply device according to  claim 8 , wherein
 the oil pump includes an inner rotor having external teeth, an outer rotor having internal teeth engaged with the external teeth, a housing that accommodates the inner rotor and the outer rotor, and a pump chamber formed in the housing, and   the air separating portion is a discharge hole for discharging the air contained in the oil from the pump chamber.   
     
     
         10 . The oil supply device according to  claim 8 , wherein
 the oil pump supplies the oil mixed with the separated air to the air mixing portion when the air is separated from the oil containing the air.   
     
     
         11 . The oil supply device according to  claim 1 , wherein
 the air mixing portion includes an inflow portion into which the oil flows in, and an outflow portion from which the oil that has flowed in from the inflow portion flows out, a reduction portion that is provided between the inflow portion and the outflow portion and has a flow passage sectional area smaller than the flow passage sectional areas of both the inflow portion and the outflow portion, and an air supply portion that is connected to the reduction portion and supplies the air to the oil.   
     
     
         12 . The oil supply device according to  claim 11 , wherein
 the air mixing portion includes a turbulence generation portion that generates a turbulence in the flow of the oil, and the air mixing portion generates a turbulence in the flow of the oil by the turbulence generation portion and causes the air around the oil of the turbulence flowed out from a discharge port to be caught in the oil by the turbulence inside the oil.   
     
     
         13 . The oil supply device according to  claim 11 , wherein
 the air supply portion supplies fresh air to the reduction portion.   
     
     
         14 . The oil supply device according to  claim 1 , wherein
 the oil pump supplies the oil mixed with the separated air to a cooling object that is different from the cooling object to which the oil containing the air is supplied by the air mixing portion, when the air is separated from the oil containing the air.   
     
     
         15 . The oil supply device according to  claim 2 , wherein
 the lubrication portion includes a non-high-accuracy lubrication portion capable of being lubricated by the oil containing the air, and the oil pump supplies the oil mixed with the separated air to the non-high-accuracy lubrication portion when the air is separated from the oil containing the air.   
     
     
         16 . The oil supply device according to  claim 2 , further comprising:
 a vehicle driving motor to which the oil containing the air of the cooling flow passage is supplied, and a transmission mechanism portion to which the oil of the lubrication flow passage is supplied and which transmits a driving force of the vehicle driving motor to wheels.