Variable displacement rotor oil pump

Abstract

The invention relates to a variable displacement rotor oil pump which comprises a pump cover, a pump case, a displacement adjusting structure and an intermediate cover plate, wherein the displacement adjusting structure comprises a centrifugal adjusting mechanism, a first inner rotor, a first outer rotor, a second inner rotor, a second outer rotor and a rotating shaft; an upper oil cavity is formed between the pump cover and the intermediate cover plate; the first inner rotor and the first outer rotor are matched with each other and are positioned in the upper oil cavity; a lower oil cavity is formed between the intermediate cover plate and the pump case; the second inner rotor and the second outer rotor are matched with each other and are positioned in the lower oil cavity; the lower oil cavity is divided to form a lower high-pressure oil area and a lower low-pressure oil area; the centrifugal adjusting mechanism, the first inner rotor and the second inner rotor rotate along with the rotating shaft; when the rotating speed of the rotating shaft is lower than the preset value, the oil in the lower high-pressure oil area is separated from the oil in the lower low-pressure oil area; and when the rotating speed of the rotating shaft is higher than the preset value, the rotating shaft and the second inner rotor are driven to rise upwards by the centrifugal force of the centrifugal adjusting mechanism, and the oil in the lower high-pressure oil area is communicated with the oil in the lower low-pressure oil area.

Description

technical field [0001] The invention relates to a rotor oil pump, in particular to a variable displacement rotor oil pump. Background technique [0002] At present, the oil pumps used in automotive internal combustion engines are generally fixed-displacement oil pumps, and the oil flow is proportional to the engine speed. The flow of this type of oil pump increases continuously with the increase of the engine speed. For a specific internal combustion engine, designers usually choose a large-displacement oil pump under the worst working conditions, that is, the oil pump corresponds to the low engine speed after determining the displacement, so that as the engine speed increases, the oil pump will The displacement of the oil pump increases accordingly. However, the lubrication of some parts of the engine does not need to increase the lubricating oil all the time as the engine speed increases. Doing so will increase the oil pressure in the engine oil passage and increase the o...

AI Technical Summary

Problems solved by technology

Although this structure can adjust the displacement of the oil pump, but at high speed, the oil pressure of the oil pump increases and the oil volume increases, and the pressure relief valve releases the pressure, so that the high-pressure oil directly flows back to the low-pressure oil area, so that part of the oil does useless work, and the engine has power loss.

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