薄壁轴承径向游隙的测量

由于薄壁轴承内、外圈的壁厚比较薄,采用加载方式测量轴承的径向游隙时,容易导致被测轴承的外圈变形,影响径向游隙的测量值。根据薄壁轴承的特点,介绍了无负荷测量薄壁轴承径向游隙的方法,保证了薄壁轴承的质量要求。     

3182100型轴承的预加过盈调整

很多机床主轴采用3182100型双列向心短圆柱滚子轴承,如图1所示。它有双列短而直径小的滚子,可充填较多的滚子,故具有较大的径向动负荷率和较高的极限转速。其内环有锥度为 1: 12的内孔、与同锥度的轴颈相配。若推动内环向大端移动,可扩涨内环滚道直径,减小滚道与滚子之间的游隙。如把游隙调整到负值,实现了预加过盈,即使轴承获得预加负荷。 一、为什么需要对轴承施加预加负荷 按照传统的方法调整3182100型轴承,通常如表1所列[8],按轴承的dnmax值来选择轴承的径向装配游隙△gn,以免它在工作负荷下运转时,因温升而使工作游隙度小,以致卡死。据…     

X095J径向游隙动态测量仪

径向游隙是轴承安装时径向定位需要考虑的重要指标之一,对轴承的振动、寿命和主机精度等都有一定的影响。介绍了针对内径100 mm以上轴承(包括航空航天轴承)径向游隙测量的X095 J径向游隙动态测量仪,详细分析其测量原理和结构设计,该测量仪实现了包括四点接触球轴承在内的轴承径向游隙的测量要求。     

宽温域向心关节轴承径向游隙试验研究

针对宽温域向心关节轴承径向游隙测量存在的宽温域测量研究少,无测量误差补偿,环境箱使用不标准,位移点测量单一等主要问题,提出了一种降低径向游隙测量误差的测量方法,研制开发了宽温域向心关节轴承试验机,通过多温度阶段自润滑关节轴承径向游隙测量验证了试验机设计的合理性及测量方法的有效性。     

一种大型三排圆柱滚子轴承径向游隙测量方法的研究

大型轴承套圈受椭圆度的影响,在组装成轴承后,其径向游隙值产生了最大值与最小值的问题.目前大型轴承径向游隙是用平均法测量的,其测量点数很少,因而测量精度不够,同时反映不出来径向游隙最大值与最小值.本文设计了一种方法能够精确测量出径向游隙平均值,同时该方法也能够测量出径向游隙最大值与最小值,并找出径向游隙最大值、最小值的方...     

大型轴承径向游隙测量方法

根据径向游隙的测量原理,利用已有条件设计了一种利用轴承自重测量轴承径向游隙的简易方法。该方法可在保证测量载荷的情况下准确测量轴承径向游隙,结构简单、使用方便、测试效率及准确性较高,而且成本较低。     

外球面球轴承径向游隙检测仪结构改进

1 问题的提出 球轴承径向游隙仪X093,X094对向心球轴承中深沟球轴承和角接触球轴承径向游隙的测量很适用,但对外球面球轴承径向游隙的测量存在不足(图1).     

航空发动机主轴轴承径向工作游隙计算与分析

径向工作游隙是航空发动机主轴轴承的重要参数,将影响到轴承中的负荷分布、振动、噪声、摩擦力矩和寿命,所以对轴承径向工作游隙进行研究很有必要。考虑了工作转速、工作温度、过盈配合因素的影响,建立航空发动机滚动轴承的径向工作游隙计算方程,并分析了过盈配合、工作转速、工作温度对工作游隙的影响规律,为航空发动机主轴轴承初始游隙的选取和过盈配合的设计分析提供依据。     

X092型游隙检测仪在薄壁角接触球轴承接触角测量中的应用

针对薄壁角接触球轴承的径向游隙测量难点,改进X092型轴承游隙检测仪,增加弹性辅助定位支承,根据接触角与径向游隙的计算关系实现薄壁角接触球轴承接触角的测量。改进后的X092型轴承游隙检测仪的检测精度良好,可精确测量中小型薄壁角接触球轴承的径向游隙。该原理也可用于改进其他轴承游隙检测仪以增大其测量范围。     

航空发动机主轴轴承径向游隙测量方法的探讨

径向游隙是航空发动机主轴滚子轴承的重要性能参数。现行测量方法是三次测量法,但不十分严密,本文建议的测量方法,是划线定测量基准,同一套轴承两次测量,取四次读数的算术平均值作为轴承的径向游隙值。此方法准确严密．能真实反映出轴承的径向游隙。     

双半外圈轴承径向游隙测量装置设计

针对双半外圈轴承游隙测量困难的问题,在径向游隙测量仪基础上,设计了一套组合测量装置,解决了测量难题.     

Wear-induced vibration in a radial roller bearing

A dependence of elastic deformation on the load in the linear contact of hardened steel parts obtained on the basis of experimental data is presented. A method for calculating the load in a radial roller bearing at various clearances and numbers of rollers, as well as with various arrangements of the rollers relative to the external load vector is described. It is shown that, at a regulated radial clearance, almost no vibration in the bearing resulting from load redistribution during its rotation occurs; the vibration increases proportionally to the clearance caused by wear. Some possibilities of reducing the vibrations are discussed.     

A study on the sound of roller bearings operating under radial load

The purpose of the paper is to numerically investigate the sound characteristics of roller bearings operating under radial load. For the sake of simplifying the analysis, it was assumed that the roller bearings are infinitely long, a noise source due to pressure fluctuation of oil film is taken as a line noise source, and acoustic energy losses in the bearing are neglected. To obtain sound characteristics of the bearing, the rolling contact load and the sound pressure level distributions were calculated for various operating conditions, and the results were compared with each other. How much the bearing noise can be affected by the design parameters, such as radial clearance of the bearing, viscosity of lubricant, and the number of rollers was also investigated. The results and discussions of the present paper could aid in the design of low-noise roller bearings and to solve the noise problems related to such bearings.     

径向游隙对圆柱滚子轴承疲劳寿命的影响

应用经典的滚动轴承理论和“切片法”的基本思想,以某大兆瓦风电机组齿轮箱输出轴轴承为例,采用Romax Designer工程分析软件,计算了圆柱滚子轴承不同径向游隙时的轴承内部载荷分布、接触应力、套圈滚道当量动载荷和寿命,分析径向游隙对轴承ISO/TS 16281寿命的影响。研究结果表明：径向游隙不仅通过对轴承内部载荷分布、接触应力和套圈滚道当量动载荷的影响而对寿命产生影响,还通过对寿命修正系数等因素的影响而对寿命产生影响。研究结果可为滚子类轴承的优化设计提供参考。     

The Role of Radial Clearance on the Performance of Foil Air Bearings

Load capacity tests were conducted to determine how radial clearance variations affect the load capacity coefficient of foil air bearings. Two Generation III foil air bearings with the same design but possessing different initial radial clearances were tested at room temperature against an as-ground PS304 coated journal operating at 30000 rpm. Increases in radial clearance were accomplished by reducing the journal's outside diameter via an in-place grinding system. From each load capacity test the bearing load capacity coefficient was calculated from the rule-of-thumb (ROT) model developed for foil air bearings.

The test results indicate that, in terms of the load capacity coefficient, radial clearance has a direct impact on the performance of the foil air bearing. Each test bearing exhibited an optimum radial clearance that resulted in a maximum load capacity coefficient. Relative to this optimum value are two separate operating regimes that are governed by different modes of failure. Bearings operating with radial clearances less than the optimum exhibit load capacity coefficients that are a strong function of radial clearance and are prone to a thermal runaway failure mechanism and bearing seizure. Conversely, a bearing operating with a radial clearance twice the optimum suffered only a 20% decline in its maximum load capacity coefficient and did not experience any thermal management problems. However, it is unknown to what degree these changes in radial clearance had on other performance parameters, such as the stiffness and damping properties of the bearings.     

过约束平面并联三维力/力矩传感器的研制

针对轴承的故障早期诊断和在线实时监测,提出了一种新型过约束平面并联三维力/力矩传感器。通过采用分支轴线均不过传感器中心的6条对称分布的测力分支,该传感器可同时测量轴承径向载荷和轴向力矩。根据静力学平衡方程,求解了其测量数学模型;基于传感器测量模型与性能指标分析了传感器性能,进而对其各结构参数进行优化设计。研制了传感器样机及其加载标定实验系统,开展了加载标定实验,得到了该传感器的测量精度。标定实验结果显示:传感器径向力测量精度为2.56%,力矩测量精度为0.92%,Ⅰ类误差为2.56%,最大Ⅱ类误差为2.29%。文中所做工作,为将该新型过约束平面并联三维力/力矩传感器应用于在线实时测量轴承径向载荷和轴向摩擦力矩奠定了基础。     

特殊结构轴承径向游隙的测量

通过对X093径向游隙测量仪的改造,使特殊结构轴承的径向游隙能够在该仪器上测量,避免了人为因素造成的测值误差,保证了该轴承径向游隙测值的准确性。