The invention discloses an inner pump cover rotor
oil pump installed on the backside of a pump cover. The pump comprises a pump cover 6, a pump body 2, an inner rotor 3 and an outer rotor 4, wherein the outer rotor 4 is installed in the rotor hole of the pump body 2, the inner rotor 3 is sleeved in the hole of the outer rotor 4, the inner rotor 3 is provided with a stepped locating ring 31, the stepped locating ring 31 is located on the left side of the inner rotor 3, and the pump cover 6 is installed at the backsides of the inner rotor 3, the outer rotor 4 and the pump body 2. Because an
oil pump front pump cover installed on the
frontage of an engine is replaced by an inner pump cover installed on the backside of the engine, the invention has the advantages that the problem of surface oil leakage is solved, and the material cost is lowered; since the pump cover is installed in the inner part of the
oil pump, the faying face of the pump cover and the pump body does not require a sealing
gasket, a working procedure for manufacturing a sealing groove is omitted, the manufacturability of
machine work is improved, and the production cost is reduced; and especially, after the front pump cover is replaced by the inner pump cover, the sealing ring hole of the front pump cover is in an integral structure, thus the installation sealing degree of the
crank shaft oil sealing hole and
crank shaft of the front pump cover is improved, and the sealing
efficacy is improved.