Variable displacement oil pump and engine lubrication system with the oil pump

Abstract

The invention relates to an engine oil pump with variable displacement. The engine oil pump with the variable displacement comprises a blade groove wheel which generates negative pressure through rotation so as to enable engine oil to be absorbed in the engine oil pump from an oil bottom casing. Blades of the blade groove wheel are arranged in a rotation cavity of an engine oil pump casing, and the rotation cavity is arranged on the engine oil pump casing through an eccentric distance adjusting mechanism and a blade central shaft in adjustable eccentric distance mode. The invention further provides an engine lubrication system with the engine oil pump with the variable displacement. The engine oil pump is simple in structure, short in engine oil flow oil path and small in oil path resistance, guarantees main oil path oil pressure, and simultaneously can save energy and reduce emission. The engine oil pump and the lubrication system are suitable for engines of various vehicles.

Description

technical field [0001] The invention belongs to the field of vehicle engine lubrication, and relates to a variable-displacement oil pump in a vehicle engine lubrication system, and also relates to an engine lubrication system with the oil pump. Background technique [0002] As the heart part of the vehicle, the engine's performance directly determines the performance of the vehicle. In order to ensure the performance of the engine, most of the existing engines are equipped with a lubricating system, which includes an oil pump for pumping oil from the oil pan, a filter for filtering the pumped oil, and a filter for A cooler in which the filtered oil is cooled. The oil pump, as a power mechanism, can pump oil from the oil pan to its own pump chamber, and then the oil flows into the cooler through the oil passage of the lower cylinder body for cooling. The removed engine oil enters the filter for filtering treatment, and the filtered engine oil flows into the oil passage of th...

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Problems solved by technology

[0004] (1) The oil pump is a quantitative oil pump, that is, within the engine speed range, the output flow of the oil pump increases with the increase of the engine speed, but when the engine reaches a certain speed, the pressure of the main oil passage is required to be stable, and the oil pump is required to The output oil volume no longer increases, but the above-mentioned oil pump cannot reduce the output of oil volume, and continues to increase the output oil volume according to the increase of the engine speed; and in order to ensure the oil pressure of the main oil passage, the existing oil pump is equipped with Bypass valve, the excess oil is discharged through the bypass valve, which causes the oil pump to do more useless work, thus consuming more power of the engine, which is not conducive to the energy saving and emission reduction of the vehicle;

[0005] (2) The cooler is made of stainless steel, which is large in size, heavy in weight and high in cost, which indirectly increases the cost of the engine and increases the fuel consumption of the engine;

[0006] (3) Most of the filters are rotary filters, which are integral and inseparable. However, due to the maintenance of the engine, new filters must be replaced within a certain period of time, resulting in high after-sales costs;

[0007] (4) The circulation oil circuit of the engine oil is complicated, and there are many detours in the oil circuit, which causes the resistance of the engine oil to be large, and the oil pressure reaching the main oil passage decreases. In order to ensure the same main oil passage pressure, the oil pump needs to output a larger Oil pressure, causing the oil pump to consume more power

[0008] In addition, in the existing lubrication system, the filter and the oil pump are installed and positioned with different reference parts, and the installation error and positioning relationship between different reference parts need to be adjusted during assembly, which brings great inconvenience to the assembly operation

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