Patent ID: 9206803
Filing Date: 2015-12-08
Classification: F04B,F04C,F16H,F16L

Abstract:
1. An oil pump apparatus for supplying an oil to a vehicular transmission, comprising: a pump section including a pump to suck the oil from an oil reservoir through an inlet port into a pumping chamber, to discharge the oil through an outlet port and to supply the oil to the transmission; an intake circuit provided between the oil reservoir and the pump section and arranged to convey the oil sucked from the oil reservoir to the inlet port of the pump section, the intake circuit including a proximal segment, an intermediate segment and a distal segment, the proximal segment extending from a proximal first connecting end portion connected with the inlet port of the pump section, to a proximal second connecting end portion connected with the intermediate segment, the intermediate segment extending from an intermediate first connecting end portion connected with the proximal second connecting end portion of the proximal segment, to an intermediate second connecting end portion which is connected with the distal segment at a position higher than a position of the intermediate first connecting end portion and which is located at a position higher than a position of the intermediate first connecting end portion of the intermediate segment, and the distal segment extending from a distal first connecting end portion connected with the intermediate second connecting end portion of the intermediate segment to an end portion formed with a suction opening to suck the oil from the oil reservoir into the intake circuit, the distal first connecting end portion of the distal segment being located at a position higher than the suction opening, wherein the pump section further includes a pump main body including an intake port forming the inlet port, a discharge port forming the outlet port and at least the pumping chamber, and a volume of an inside bore of the distal segment of the intake circuit is smaller than a volume of a space formed in the pump main body.