Working principle of engine oil pump
The working principle of the engine oil pump is:When the engine is working,The drive gear on the camshaft drives the transmission gear of the engine oil pump,Rotate the driving gear fixed on the driving gear shaft,Then it will drive the driven gear to rotate in the opposite direction,Send engine oil from the inlet chamber along the backlash and pump wall to the outlet chamber.This look,Low pressure is formed at the oil inlet chamber,causing suction,Suck the engine oil from the oil pan into the oil chamber.Because the driving and driven gears continuously rotate,The engine oil is continuously pressed to the desired location.
Engine oil pump according to structural formIt can include two types:gear type and rotor type.Gear engine oil pumpAlso divided into external gear type and internal gear type.
External gear engine oil pump housingEquipped with a driving gear and a driven gear inside the body.The gap between the gear and the inner wall of the housing is very small,There is an oil inlet on the housing.at work,
The volume of the oil inlet chamber during gear rotation
increases due to the movement of the gear teeth in the
direction of disengagement,Create necessary vacuum inside the cavity,The engine oil is then sucked in from the oil inlet and filled into the oil inlet chamber.
When the gear rotates, it carries the engine oil stored between the teeth into the oil outlet chamber
.Because the gear teeth on one side of the oil outlet chamber engage,Reduced volume of oil outlet chamber,Oil pressure rise,The engine oil then passes through the oil outlet Sent to the engine oil passage.
The engine oil pump is usually driven by the spiral gear or the front end of the crankshaft on top
.During engine operation,The engine oil pump keeps working,So it will ensure that the engine oil continuously circulates in the lubricating oil circuit.
When the gear engages,Engine oil between meshing teeth,
Because the volume decreases,Create a very large thrust between the gears.in view of this,Mill out a pressure relief groove on the pump cover,The engine oil squeezed out between the teeth during gear tooth meshing can flow to the oil outlet chamber through the pressure relief groove.Install a limited pressure valve on the engine oil pump cover,It can adjust the oil pressure of the main oil channel within the normal range of 0.15~0.9MPa.There is a radial ring groove at the plunger end of the pressure limiting valve,Used to store debris and impurities entering the mating surface to ensure flexible plunger movement.