Optimization Of The Wear Problem Of Vane Pump Sliding Block

2018-08-30 15:42:33

Based on a certain type of vane pump slider wear problem optimization research, vane pump by the vane and the
slider, locating ring, inner rotor core parts to achieve the function of blade pump suction and discharge of oil, due to vane and slide direct contact with the vane is key to blade's biggest eccentricity, minimum eccentricity location, application

IS-DYNA software to model the stress analysis of the movement of the at the same time considering the blade rotation will be impacted by the inner rotor and the locating ring, blade has forced vibration, adding to the blade wear on the slider, so the rotor, the slider structure optimization.

The pump is the heart of the engine lubrication system, which absorbs oil from the sump and continuously supplies the pressure lubricant to the entire engine's various friction components.
If the oil supply of the pump is insufficient, it will cause the engine to lack sufficient lubrication pressure, causing severe wear and tear of the engine. However, if the oil supply is maintained very high, it will inevitably increase the internal loss of the engine, resulting in unnecessary waste. Therefore, the need for the oil pump is best to provide the fuel supply according to the needs of the engine, so with the development of science and technology derived from the actual demand for oil from the engine oil pump, that is, variable machine oil pump, and the representative of the variable oil pump is the vane pump, the advantages of low cost, relatively simple structure, can be in accordance Ensure reliable operation of the engine.

1 vane pump core components Structure scheme introduction
The core components of the vane pump we have designed are as follows: This vane pump consists of a sliding block
1, the positioning Ring 2, the internal rotor 3, the Blade 5 is composed of a tight system, the variable pump rotor directly mounted on the crankshaft, through the rotation of the crankshaft directly drive the internal rotor, to provide power for the pump, the slider to the rotary pin hole 4 As the center of the variable swing, composed of 7 blades, rotating oil drain work.
1-Slide, 2-Locating ring X2 (one front and back), 3-Internal rotor, 4-Slide rotary pin hole, 5-blade x7 (Total 7 blades)

2 Wear Problem Introduction
The image below is a model vane pump slide wear photos, engine durability test, the vane pump slide has serious wear, blade material is tool steel quality,
And the slider material is powder metallurgy material, the blade hardness is about 3 times times the hardness of the sliding block, once there is a problem, the slider must first be damaged, after the sliding block wear, the blade is not controlled by the system, the internal rotor break, the function of the oil pump failure, resulting in engine pull cylinder scrap.

3 Blade Stress Analysis
Force analysis of 3.1 maximum eccentric distance position
Vane rotation from the oil-absorbing oil area to the closed zone, to the drainage area, to the closed zone, and then to the oil-absorbing oil region so cycle, the horizontal axis of time, each blade after 4 sections of the sudden change in position, will appear a larger force value fluctuations, which will cause a huge impact on the position slider, prone to wear and tear.

Force analysis of 3.2 minimum eccentric distance position
The same time each blade through 4 sections of the sudden change in position, there will be a force value fluctuations, but relative to the maximum eccentricity position of the force value is reduced, because the position of the pump oil is 0, so the position is not the main position of the sliding block wear, but also the existence of the peak of force mutation.

4 optimization Scheme
4.1 Slide block Structure optimization
Oil suction area, the thickness of the oil drain area increased by 1.1mm, considering the position requires double-sided oil, the pros and cons of the position to increase to 1.1mm is the limit position, so as to reduce the blade movement to the position of the Force peak, to ensure smooth operation of the blade, at the same time in the oil field, the slider to increase the double-sided

4.2 Optimization of the inward sub-structure
The internal rotor is directly driven by the crankshaft, and the crankshaft must exist crankshaft runout, the crankshaft runout of 0.03, the crankshaft and the internal rotor clearance of 0.25, so that the internal rotor with the crankshaft runout and drive gap caused by a huge excitation impact, resulting in a shock between the blade and the sliding block, is also caused by a factor of sliding block wear, the internal rotor to increase the stop positioning, crankshaft internal rotor drive, not affected by the crankshaft runout and drive tolerance, will be rotated along the rotating center of the inner rotor, greatly reducing the internal rotor to the blade of the excitation shock, so that the blade rotation smooth movement, to avoid the wear of the sliding block.

5 Conclusion
Through the optimization of the above scheme, the engine carries out two rounds of 400h endurance test without the slide wear problem, the optimization scheme is validated effectively, and the
Photo of the durability test, the slide wear condition intact:

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