Variable displacement vane oil pump directly driven by crank shaft flat block

Abstract

The invention discloses a variable displacement vane oil pump directly driven by a crank shaft flat block. A pump cover is arranged on a pump body through pump cover mounting screws; a rotor provided with blades and an eccentric blade positioning ring is arranged in a cavity of the pump body; a disc positioning boss on the rotor is in clearance fit with a crank shaft mounting hole in the pump body; a variable slide block is arranged in the cavity of the pump body; a rotor mounting hole in the variable slide block is sleeved on the rotor; a slide block rotary positioning pin penetrates through a slide block rotary positioning pin mounting hole in the variable slide block to be mounted in the slide block rotary positioning pin mounting hole in the pump body and a slide block rotary positioning pin mounting hole in the pump cover; a variable spring is arranged on one side in the cavity of the pump body; and one end of the variable spring is in contact with the bottom in the cavity of the pump body, and the other end of the variable spring is supported against a spring press block on the variable slide block. Through the variable displacement vane oil pump directly driven by the crank shaft flat block provided by the invention, the cost of transmission parts and the loss risk are reduced, and the safe reliability of the variable displacement vane oil pump is improved.

Description

technical field [0001] The invention relates to the technical field of lubricating systems of internal combustion engines, in particular to a variable-displacement vane oil pump directly driven by a crankshaft. Background technique [0002] The existing variable-displacement vane oil pump consists of a pump body, a pump cover, a rotor, a slider, vanes, a support ring, a slider spring, a rotary pin, a rubber rod, a rectangular sealing strip and a transmission part. There are the following deficiencies in the above structure: [0003] A. There is no coordinated positioning between the pump body and the transmission shaft, but the pump body is positioned with the cylinder body through the positioning sleeve, and the transmission shaft and the pump body are positioned indirectly. The rotor has no radial positioning and does not have a centering effect. The rotor in the oil pump rotates by Cooperate with the transmission shaft to center, the pump body does not play the role of t...

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Problems solved by technology

[0004] B. When the transmission of the transmission shaft is not stable, the rotor transmission will be unstable, which will affect the size of the eccentricity, affect the flow performance, and affect the expansion and contraction of the blade in the rotor blade groove, and the wear of the blade, the positioning ring and the inner circle of the slider , causing abnormal wear and tear, leading to a decrease in the performance of the oil pump, a risk to safety and reliability, and an increase in the torque of the transmission;

[0005] C. The existing variable-displacement vane oil pump is an unbalanced single-acting vane pump. Due to the high pressure at the outlet and the low pressure at the inlet, the rotor will be biased to one side and affected by the instability of the transmission shaft, resulting in uneven force on the rotor. Long-term During use, it is easy to cause the rotor to fatigue, crack or even burst, resulting in a serious risk of engine burnout

[0006] D. The transmission shaft of the existing variable displacement vane oil pump structure is not the crankshaft, but through intermediate transmission (such as gears, chains, belts, etc.), this structure increases the cost of parts and the weight of the whole machine, and reduces the variable displacement vane oil pump reliability

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