Oil pump with variable displacement

Abstract

The invention discloses an oil pump with variable displacement. The oil pump with variable displacement comprises an inner cavity, wherein a stator, a rotor and an elastic element are arranged in the inner cavity, the stator and the rotor are eccentrically arranged, multiple blades are fixed to the rotor, a first control chamber is arranged between the stator and the inner cavity, a first oil line is communicated with a feedback oil line of a main oil gallery of an engine, a first protruding block is arranged on the stator, a second control chamber is arranged between the stator and the inner cavity, a second protruding block which extends into the second control chamber is arranged on the stator, the second control chamber is communicated with a second oil line, the first oil line is connected with the second oil line through a reversing valve, and the reversing valve is used for controlling the second control chamber to be communicated with the first control chamber or an oil pan. According to the oil pump with variable displacement, since the electrically-controlled two-stage variable displacement technology is adopted, the displacement of the oil pump can be adjusted according to different demands of the engine for engine oil flow under different working conditions, the situation that the oil pump consumes excessive engine power is avoided, and the effects of energy conservation and emission reduction of the whole oil pump are achieved.

Description

technical field [0001] The invention relates to a rotary pump, in particular to a variable displacement oil pump. Background technique [0002] The engine oil pumps currently on the market can be divided into two categories according to their layout: independent type and integrated engine front cover type. The pump body of the independent oil pump is generally arranged under the crankshaft, and is driven by the crankshaft by means of gears or sprockets. The pump body of the integrated front cover type oil pump is integrated in the front cover of the engine, and is generally directly driven by the crankshaft. [0003] The independent oil pump is generally arranged under the crankshaft, driven by a separate drive system (gear or sprocket plus chain), the drive structure is not compact enough, it takes up a lot of space, and requires many parts. Under the trend of lightweight, this design has certain shortcomings, which is not conducive to controlling the overall size of the ...

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Problems solved by technology

[0006] In terms of variable displacement oil pumps, patents 201020140940.8 and 201110326276.5 also declare two variable displacement technologies, but the disadvantage is that the range of displacement of the oil pump is limited by the function, and the energy consumption saved is limited. , failed to achieve precise control according to engine operating conditions

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