本文關(guān)鍵詞： 球活塞式液壓泵 彈流潤滑 邊界滑移 摩擦動力學(xué) 泄漏特性　出處：《北京理工大學(xué)》2014年博士論文　論文類型：學(xué)位論文

【摘要】：球活塞式液壓泵因其結(jié)構(gòu)簡單，易于實現(xiàn)大排量、大功率等特點為許多液壓機(jī)械無級變速裝置所采用。在球塞泵運行中，球活塞、缸體、作用環(huán)等構(gòu)件組成的運動副處于復(fù)雜的潤滑狀態(tài)下，并表現(xiàn)出較強的非線性動力學(xué)特征。本文全面考慮了以球活塞為中心的球塞副摩擦學(xué)特性與動力學(xué)模型的耦合關(guān)系，建立了作用環(huán)-球活塞-缸體構(gòu)件組的摩擦動力學(xué)模型。應(yīng)用該模型，揭示了球塞副的動力學(xué)行為，接觸潤滑特性以及效率特性等。 本文考慮邊界滑移效應(yīng)，建立了球活塞-缸孔摩擦副潤滑模型。根據(jù)純滾動假設(shè)，進(jìn)行球塞副基本運動和受力狀態(tài)分析，獲得各接觸對在不同位置和時刻的載荷分布規(guī)律，確定了球活塞與缸孔側(cè)壁間處于周期性變載荷、變卷吸速度的大滑滾比點接觸彈流潤滑狀態(tài)。應(yīng)用速度邊界條件分析邊界滑移速度特性，根據(jù)油膜極限剪切力理論，引入Circular流變模型對等效粘度進(jìn)行計算，并用于修正廣義雷諾方程。應(yīng)用多重網(wǎng)格法和Gauss-Seidel松弛迭代法聯(lián)立求解，獲得了接觸區(qū)的油膜分布和壓力分布等潤滑特性，并計算油膜剪切力和承載力。運用摩擦系數(shù)對求解結(jié)果進(jìn)行分析，揭示了球塞副特殊工況下的油膜剪切特性。采用與實際結(jié)構(gòu)一致的模擬試驗裝置，對計算結(jié)果進(jìn)行驗證。 本文建立了球活塞三自由度摩擦動力學(xué)模型，包含摩擦學(xué)模型、動力學(xué)模型及結(jié)構(gòu)變形三個組成部分。首先明確了建模體系中使用的坐標(biāo)系及相互間的轉(zhuǎn)換關(guān)系。在此基礎(chǔ)上，運用既已建立的球活塞-缸孔摩擦副潤滑模型，和球活塞-作用環(huán)接觸副彈流潤滑模型，構(gòu)成摩擦學(xué)模型。運用有限元方法，對球塞副構(gòu)件間多點耦合結(jié)構(gòu)變形進(jìn)行計算，并將結(jié)果引入摩擦學(xué)模型作為計算條件。對球塞副構(gòu)件間的各項受力和運動關(guān)系進(jìn)行分析，建立非線性動力學(xué)方程組，采用數(shù)值方法進(jìn)行求解�；谏鲜瞿Σ翆W(xué)模型、變形關(guān)系和動力學(xué)模型，建立了多項因素非線性耦合的球塞副摩擦動力學(xué)模型。采用耦合求解方法，實現(xiàn)了球活塞動力學(xué)特性、摩擦副彈性形變特性及潤滑特性的耦合求解。 根據(jù)對球活塞摩擦動力學(xué)模型在不同工況和結(jié)構(gòu)參數(shù)條件下的求解結(jié)果，研究了工作周期內(nèi)球活副構(gòu)件間的動態(tài)接觸力學(xué)特性，獲得單個球活塞的動力學(xué)行為。重點針對球活塞-作用環(huán)間滑移行為特性及其影響因素進(jìn)行了分析，揭示了球塞副多接觸點耦合受力特性和微觀運動特性。根據(jù)單球塞副的穩(wěn)態(tài)和動態(tài)分析結(jié)果，對球塞泵整機(jī)效率特性進(jìn)行計算，，并加以試驗驗證。對球塞副間的油膜壓力和剪切動態(tài)過程進(jìn)行了研究，得到各種工況下的潤滑特性。探討了球活塞直徑、作用環(huán)尺寸、空心球活塞等結(jié)構(gòu)參數(shù)對摩擦動力學(xué)特性的影響規(guī)律�；谀Σ羷恿W(xué)特性，分析了球活塞-缸孔偏心縫隙動態(tài)變化特性，并基于此對球活塞-缸孔副的偏心圓環(huán)泄漏流動進(jìn)行建模和計算，得到不同工況和結(jié)構(gòu)下的效率特性，并進(jìn)行了單球塞副泄漏量模型試驗和整機(jī)容積效率的試驗驗證。
[Abstract]:Ball piston hydraulic pump because of its simple structure, easy realization of large displacement, high power characteristics for many hydraulic machinery stepless speed change device used in ball piston pump. In operation, the ball piston, cylinder, ring components such as the movement of vice in the lubrication under complicated state, and shows strong nonlinear dynamic characteristics. Considering the coupling between the piston with the ball as the center of the ball tribological characteristics and kinetic model, established the friction dynamic model of ring - Cylinder - piston ball components. This model is used to reveal the dynamic behavior of ball piston pair, contact lubrication characteristics and efficiency characteristics.
In this paper, considering the boundary slip effect, a ball piston cylinder bore lubrication friction model. According to the assumption of pure rolling, ball piston movement and basic analysis of stress state, the contact load distribution in different locations and time, determine the periodic load variable ball piston and cylinder hole wall in between. Variable entrainment speed big slide roll ratio Point Contact Elastohydrodynamic Lubrication. The analysis of application of boundary slip velocity boundary condition, the ultimate shear force of oil film theory, introducing the Circular rheological model of equivalent viscosity were calculated and used to modify the generalized Reynolds equation. The application of multigrid method and Gauss-Seidel iterative relaxation method to solve the system, obtain the contact area of the oil film distribution and pressure distribution of the lubrication characteristics, and calculate the shear force of oil film and bearing capacity. The friction coefficient to analyze the results, reveals the special work of ball piston pair The oil film shear characteristics under the condition of the condition are verified by the simulation test device which is consistent with the actual structure.
This paper establishes the ball piston with three degrees of freedom dynamic friction model, including tribological model, dynamic model and structural deformation of three parts. Firstly, clarifies the relationship between the use of modeling system in the coordinate system and the inter conversion. On this basis, the use of both established ball piston - cylinder friction and lubrication model. The ball piston ring contact elastohydrodynamic lubrication model, a friction model. Using the finite element method, the multi coupled structure deformation of ball piston pair between components are calculated, and the results into the tribological model as a calculation condition. The ball piston pair between components by analyzing the relationship between force and motion, a nonlinear dynamic equation group, is solved by numerical method. The tribological model based on relationship between deformation and dynamic model, the establishment of a number of factors with nonlinear coupling of ball piston friction dynamic model using. The coupling solution method is used to solve the dynamic characteristics of the ball piston, the elastic deformation characteristics of the friction pair and the coupling of the lubrication characteristics.
According to the results of ball piston friction dynamic model under different operating conditions and structure parameters, studied the working period of the ball live dynamic contact mechanical properties of side components, obtain the dynamics of individual ball piston. The key factor for the ball piston ring role slip behavior characteristics and influence factors are analyzed, revealing the ball multi contact plug coupling force characteristics and micro motion characteristics. Based on the single ball piston pair of static and dynamic analysis results of ball piston pump efficiency characteristics are calculated and verified. The ball piston pair between the oil film pressure and shear dynamic process were studied. The obtained lubrication characteristics under various conditions the discussion on the ball. The diameter of the piston, ring size, influence of piston hollow ball and other structural parameters on dynamic characteristics of friction. Friction Dynamics Characteristics Based on the analysis of ball piston cylinder Kong Pian heart Based on the dynamic characteristics of the gap, the leakage flow of eccentric ring of spherical piston cylinder port pair is modeled and calculated, and the efficiency characteristics under different conditions and structures are obtained. The model test of single ball plug pair leakage and the volumetric efficiency test of the whole ball are carried out.

【學(xué)位授予單位】：北京理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：TH137.51

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