共查询到17条相似文献,搜索用时 154 毫秒
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机油泵的作用是为润滑系统提供动力。四冲程发动机机油泵有两种形式,即齿轮泵和次摆线型机油泵(亦称内外转子式)。机油泵的结构是将内转子固定在油泵腔内转动。当内转子随着油泵转动时,外转子也随着转动,在两个转子之间形成的空间容积就会发生变化。机油从空间变大的一侧被吸入,而被该空间挟住并被送到相反 相似文献
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当内啮合转子式机油泵内外转子采用标准件情况下,其油腔的结构将极大地影响着泵的性能。给出某转子泵油腔的设计过程:首先计算出泵体(盖)上呈对称月牙状的理论进、出油槽的位置,然后为提高泵的容积效率及降低轴功率,运用CAE技术分析并改进泵油腔设计,即运用泵类专用仿真软件PumpLinx对泵内部流场进行计算流体动力学(CFD)数值模拟分析;应用ABAQUS等分析软件对泵壳体的变形和密封性进行有限元强度分析,最后进行泵样机台架设计试验验证。比较发现:CFD仿真模拟得到的虚拟泵各项参数与泵样机台架试验的相关结果基本吻合;泵壳体的有限元强度分析符合其台架极限试验结果。由此可见,CAE技术为机油泵开发提供了现代化的研究方法和技术支持。 相似文献
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本文就K6发动机机油泵调压阀开启压力对发动机机油压力的影响进行了试验总结,并对机油泵调压阀开启压力值进行了设计计算和分析,以便对今后类似问题的解决有所启迪和帮助。 相似文献
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2.机油泵发动机配备带一体式真空泵的可变流量机油泵,具有体积流量控制功能,能根据发动机负载和转速改变输出。可变流量机油泵如图12所示,部件分解图如图13所示。机油泵具有排量控制机制,能根据发动机负载和转速改变输出。 相似文献
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为了提高车用发动机润滑系统中的机油泵的研究和设计水平,对机油泵的主要性能指标进行了讨论,分析了不同类型机油泵的特点和发展趋势。结合作者近期生产实践和试验研究中的一些工作,分析了车用发动机机油泵试验台的架构、功能及典型试验结果。以目前各国的文献成果为依据,综合研究了排量、容积效率、压力波动等性能指标的影响因素及相互联系。通过试验台的测试实例论证了机油泵振动和噪声的测试方法和分析手段。结果表明:定排量机油泵无法满足发动机节能减排的要求,必须进行变排量泵的研发;基于完全空化模型的数值模拟方法是分析机油泵空化现象的有效手段;机油泵的振动和噪声性能受到压力波动和机械啮合的双重影响,必须综合考虑。 相似文献
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研究1款小排量自然吸气发动机,通过将发动机机油泵由定排量机油泵更改为可变排量机油泵以达到降低发动机燃油耗的目的。根据项目的实际需求,优先考虑采用经济性较好、对周边零部件更改程度较小的机械式两级可变排量机油泵。首先根据发动机润滑系统各主要零部件的润滑需求确认发动机主油道的最优润滑油压力,其次根据主油道的供油压力确定变量泵的关键性能参数,最后通过发动机燃油耗对比试验确定该变量油泵应用后对降低该发动机燃油耗的贡献。 相似文献
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Gerotor pumps are widely used in the automotive industry for engine oil lubrication, due to their high volumetric efficiency
and smooth pumping action. In many cases, the lubricating oil from the sump is mixed with contaminants, such as dust and tiny
solid particles, or becomes thickened, due to aging. These problems will lead to critical situations, such as increased noise,
enhanced wear and erosion, and poor lubrication of the engine. These critical situations were studied by conducting a detailed
CFD integrated investigation on a gerotor pump’s performance at different operating conditions in three phases, and the results
are presented in this paper. In first phase, a CFD model of a gerotor pump was developed with a dynamic mesh for the rotary
movement of both the inner and outer rotors. The effects on pump flow rate of important parameters, such as rotor speed, fluid
viscosity and number of ports, were simulated using non-contaminated oil at room temperature and an elevated temperature of
140oC. The relationship between flow rate and pressure at different rotor speeds was predicted and validated with test data
for further parametric study. The pressure ripples at different time steps were measured at different angular positions of
the rotors to examine the model accuracy. It was found that the flow rate increased and pressure pulsation, as well as flow
recirculation, was reduced when ports were added to the cover plate. A suction pipe with a strainer was added for the second
phase to capture the undesired changes in flow behavior, such as cavitation, which is caused by negative suction at the inlet
region of pump. A suitable size for the inlet suction pipe for this pump was chosen after performing tests to characterize
the flow behavior with single and double ports. Next, the relationship between pressure drop and strainer porosity was determined
using different porosity values for the strainers. In the final phase, oil with different concentrations of solids was simulated
to measure the effect of solid particles on flow rates and pressure losses. It was observed that the intensity of the recirculation
was reduced at the suction end at the higher concentration of 0.04%, due to particle inertial effects. It was also found that
particle size distribution affected the overall efficiency and pressure head of the pump. 相似文献
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车用增压器浮动轴承外间隙设计的研究 总被引:1,自引:0,他引:1
介绍了测试车用增压器动态特性的方法及测试系统。辨识了增压器转子振动信号谱图中各个主要成分的物理意义,分析了浮动轴承的动态特性即特频及其变化规律,确认了浮动轴承外间隙对转子振动有很大的附加影响。根据特频与基频变化情况,选择具有不同外间隙的浮动轴承进行试验,找出了降低浮动轴承外间隙对转子振动附加影响的途径,进而提出了确定浮动轴承质量,外间隙设计和选择润滑油的建议. 相似文献
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