JS315型减速机振动噪声的研究

齿轮箱的振动和噪声能够反映齿轮装置的品质,影响齿轮箱振动和噪声的因素有齿轮啮合、轴系变形、箱体精度以及安装误差等因素,其中齿轮啮合是主要因素,而齿轮的基节偏差和齿形偏差又是影响齿轮传动平稳性的主要因素。通过对公司JS315型减速机振动和噪声的研究,分析了影响齿轮箱振动和噪声的因素,找出了造成振动和异响的原因,成功解决了这一问题。     

一点通

听声音快速诊断驱动桥异响二例(1)主减速器齿轮异响1台液压挖掘机在更换主减速器齿轮后,行驶时连续发出"嗷嗷"的响声,随着机器转速的升高,响声增大。用手触摸驱动桥,感觉发热烫手。主减速器齿轮异响的原因主要是齿轮啮合间隙调整不合理或齿轮磨损。若其发出无节奏的"咯噔、咯噔"的撞击声,主要原因是齿轮啮合间隙过大或齿轮磨损;若发出连续的"嗷嗷"的金属挤压声,主要原因是间隙调整过小或润滑不足;若发出有节奏的"哽、哽、哽"的响声,主要原因是啮合间隙不均、从动锥齿轮齿圈装配不当,或工作     

汽车变速器异响的原因及诊断

１汽车变速器异响的几种现象（１）变速器空档异响；（２）直接档工作无异响，其它档均有异响；（３）变速器低速档有异响，高速档响声减弱或消失；（４）变速器个别档有异响；（５）变速器各档均有异响。２原因分析及诊断变速器异响的实质，归纳起来不外乎以下两个方面：一是轴承异响，主要轴承磨损松旷和损坏；二是齿轮啮合异响，主要由于变速器缺油，形成干摩擦；齿轮磨损过甚，使齿侧间隙过大，这两种原因产生连续不断的啮合噪声。另外是齿轮牙齿折断，变速器壳变形，齿轮轴弯曲导致齿轮啮合位置改变，这种原因一般产生周期性的异响。变…     

基于ITI SimulationX的变速器齿轮振动噪声仿真研究

在ITI SimulationX中构建整车动力传动系统模型,并通过仿真计算,得出变速器齿轮在传动过程中驱动齿轮轮齿左右两侧界面所受法向力的变化,得出齿轮的啮合振动频率和异响噪声规律,可为研究变速器齿轮非线性振动噪声提供一定参考.     

听声音快速诊断驱动桥异响二例

（1）主减速器齿轮异响1台液压挖掘机在更换主减速器齿轮后,行驶时连续发出＂嗷嗷＂的响声,随着机器转速的升高,响声增大。用手触摸驱动桥,感觉发热烫手。主减速器齿轮异响的原因主要是齿轮啮合间隙调整不合理或齿轮磨损。若其发出无节奏的＂咯噔、咯噔＂的撞击声,主要原因是齿轮啮合间隙过大或齿轮磨损;若发出连续的＂嗷嗷＂的金属挤压声,主要原因是间隙调整过小或润滑不足;若发出有节奏的＂哽、哽、哽＂的响声,     

发动机薄壁齿轮室加工的三点联动浮动支撑夹具设计

我公司生产的非道路车辆用柴油机是一拖集团公司的主导产品之一,柴油机动力输出系统壳体齿轮室、齿轮室盖等薄壁零件,在面铣削加工时一直存在变形较大等问题,具体表现在经粗铣加工后的正是齿轮室的前后端面出现不规则变形,不仅造成面精铣余量不均,而且影响后序齿轮系孑L位置和形状精度,造成柴油机的整机装配质量问题。如孔形状偏差引起油封漏油;孑L位置偏差、位置度偏差引起齿轮啮合间隙过大或过小或啮合不均,振动噪声大、使用寿命降低等。     

柴油机齿轮啮合异响的原因分析及解决措施

1　问题的提出齿轮啮合异响问题是单缸柴油机产品使用中经常遇到的质量问题。例如 ,常柴公司生产的Ｓ195柴油机在山东市场的用户反馈中 ,反映柴油机存在异响问题的曾占全部质量问题的 85%以上 ,而这些产品出厂试验时的噪声指标均合格。根据有关质量信息 ,我们对企业三包服务、装配、校车等有关人员进行了调查 ,据反映 ,柴油机异响主要发生在齿轮箱中 ,既有周期性异响 ,也有非周期性异响。　　2　齿轮异响原因分析根据用户反馈信息对齿轮啮合异响原因进行分析 ,笔者认为 ,齿轮啮合异响的形成原因较复杂 ,齿轮箱各齿轮孔的形状和位置误差、齿…     

某乘用车手动变速器齿轮啸叫噪声研究

为解决某乘用车手动变速器存在的齿轮啸叫噪声问题,首先通过整车道路试验和变速器台架试验,识别出产生齿轮啸叫噪声的特征阶次及转速,然后建立该手动变速器齿轮传动系的多体动力学模型,考虑各对齿轮的时变啮合刚度、齿侧间隙、啮合阻尼,仿真获得了轴承动态载荷。利用在二挡工况下获得的变速器各轴承动载荷,采用有限元及边界元法计算了变速器壳体的振动响应及辐射噪声,并利用试验测得的结构表面振动加速度进行了试验验证。仿真获得了变速器壳体主要噪声源位置,为降低齿轮啸叫噪声提供了依据。     

装载机传动系常见故障

1.驱动桥常见故障(1)异响零部件质量不合格、主传动在装配时安装和调整不当,以及使用中磨损过甚等,都会使装载机在行驶和作业中发出异响。一般情况下,异响随机器速度的增加而增大。一般有以下几种异响:①主、被动齿轮啮合间隙不当发出异响。其原因及现象有:若主、被动齿轮啮合间隙过大,引起轮齿间相互撞击,响声为无节奏的"咯噔、咯噔"声;若啮合间隙过小,使轮齿之间相互挤压,响声为连续的"嗷嗷"声,并伴有驱动桥发热;若啮合间隙不     

提高CBG_2型齿轮泵寿命的试验研究

外啮合齿轮泵向高压化发展所遇到的主要问题是怎样在高压下保持高寿命和低噪声。本文就CBG2型高压齿轮泵提高寿命,降低噪声所取得的试验研究成果作一介绍。1985年9月,该泵已在额定压力160巴、油温为80±5℃的条件下达到了100万次台架冲击试验,冲击后的总效率仍高于85％的攻关目标,达到国外七十年代末八十年代初的齿轮泵寿命水平,并于10月下旬通过了省级鉴定。一、CBG2型齿轮泵的主要结构和特点图1是CBG2型齿轮泵结构图。泵的主要特点是采用固定式侧板,侧板被前后泵盖压紧在泵体上,轴向不能移动,通过控制泵体厚度与齿轮宽度的公差,来保证齿轮与侧板间的轴向间隙。利用液压推动侧板产生的弹性变形,来实现轴向间隙自动补偿,从而提高了油泵的容积效率。     

Relation between pressure variations and noise in axial type oil piston pumps

Pressure variation is one of the major sources on noise emission in the axial type oil piston pumps. Therefore, it is necessary that the pressure variation characteristics of the oil hydraulic piston pumps be clarified to reduce the pump noise. Pressure variations in a cylinder at the discharge region and the pump noise were simultaneously measured with discharge pressures and rotational speeds during the pump working. To investigate the effects of the pre-compres-sion and the V-notch in the valve plate, we used the three types of valve plates. In this research, it is clear that the pressure variation characteristics of axial type oil piston pumps is deeply related to the pre-compression and to the V-notch design in valve plate. Therefore, we could reduce the pump noise by using the appropriate pre-compression angle and the notch design that are between the suction port and the discharge port in valve plate.     

高安全性气动润滑注油车设计及应用

大型野外工业设备现场,道路崎岖,环境恶劣,设备移动困难,使用一段时期后,设备需要补充液压油、齿轮油、机油、防冻液、润滑脂等维持设备正常运转的必需油品.为此,可移动的润滑注油车便成为有效的运载和加注工具,受现场电力条件限制,油品加注需要的动力源大都采用车载式柴油空压机,车厢内放置空压机造成占用油品空间,封闭的空间内柴油空压机与油品混放一处,存在巨大的安全隐患.经过反复论证,重新设计和改型后的注油车去掉了整体空压机的柴油发动机,空压机的其余部分设计成可独立布置的几个单元.在封闭厢体内只保留油气分离器、冷却器、过滤器等气源控制装置,螺杆式空气压缩泵通过汽车变速箱取力口获取动力,经过中央控制器的反馈与调节,分体式空压机性能与柴油空压机完全一致,达到了安全环保满足现场需求的目的.     

基于对称双曲柄活塞驱动的空压机

由曲柄连杆机构驱动的普通活塞式空压机存在噪声、振动和缸体磨损等问题,提出双曲柄连杆机构驱动的活塞式空压机来解决这些问题;同时设计了基于对称双曲柄活塞驱动的二次增压双作用空压机和双级双作用空压机,提高了空压机的输出压力和流量,并可实现低压大流量和高压小流量的输出控制;降低空压机的振动和噪声,提高平稳性,降低活塞和气缸缸体的磨损,提高空压机的使用寿命。     

Transfer characteristics of vehicle air conditioners’ booming noise

Vehicle air conditioners generate a booming noise when pressure pulsation in the compressor is generated and transmitted to vehicle interiors through the attached pipes and chassis, which constitute a typical noise transfer path between the compressor and the interior. In this study, the transfer path analysis and operational deflection shape methods were employed for analyzing the characteristics of noise transfer paths, and acoustic intensity was measured through empirical experiments for analyzing the characteristics of the response system. The rigid body mode of the double pipe influences the dynamic behaviors of the liquid pipe, which is the major noise contribution path. The force exerted on the liquid pipe generates not only structure-borne noise but also air-borne noise in a heating, ventilation and air-conditioning system. An experiment was carried out to reduce such noise by distributing the high noise contribution to the low one. Through this experiment, we propose a path coupling method for noise reduction that modifies the contribution of each transfer path from the source to the receiver.     

双离合变速器敲击噪声的仿真分析与实验评价

针对某变速器在车辆一挡起步工况实验中出现敲击噪声的问题,利用LMS Virtual.Lab软件搭建了包含轴、齿轮、同步器、轴承、差速器、壳体等部件的双离合变速器刚柔耦合模型.考虑输入轴转速波动、轴承刚度非线性、齿轮啮合时变刚度和阻滞力矩,以再现敲击噪声发生时壳体的振动响应.仿真计算与实验结果的良好一致性,验证了仿真分析方法的有效性.     

空气压缩机降噪技术现状

空气压缩机的应用十分广泛,但在运行时空压机将产生很大的噪声。空压机噪声来源有：出入口空气与空气及设备之间相互碰撞产生的吸气、排气噪声,冷却器卡门漩涡激起的振荡所产生的噪声,外部表面结构罩壳、盖板、管道等在气体动力和机械振动激发下产生的表面辐射噪声以及电机工作时产生的电磁噪声。产生的噪声,会让周围的生产环境恶化,对生产人员身体的影响相当大,因此降低空压机的噪声显得很有必要。本文介绍了现行一些在消声、隔声、吸声等方面的降噪技术。     

水压机泵站高压蓄势器安全保护的改进

水压机泵站高压蓄势器中的气体压强高达32 MPa。在原有的电气控制系统中,并没有把此气体压强作为安全保护的控制点。一旦安全阀失效,就将存在着严重的安全隐患;即使安全阀起暴,从安全阀喷出的高压水不但污染环境,而且会造成短路甚至电击事故。为使其安全保护更加安全可靠,将高压气的气体压强也作为一个控制点加入到PLC自动控制系统中。蓄势器气压超高和过低时自动控制系统均按预设值自动关闭空压机、高压水泵或最低液面阀,并报警。     

Noise Reduction of an Axial Piston Pump by Valve Plate Optimization

Current researches mainly focus on the investigations of the valve plate utilizing pressure relief grooves. However,air?release and cavitation can occur near the grooves. The valve plate utilizing damping holes show excellent perfor?mance in avoiding air?release and cavitation. This study aims to reduce the noise emitted from an axial piston pump using a novel valve plate utilizing damping holes. A dynamic pump model is developed,in which the fluid properties are carefully modeled to capture the phenomena of air release and cavitation. The causes of di erent noise sources are investigated using the model. A comprehensive parametric analysis is conducted to enhance the understanding of the e ects of the valve plate parameters on the noise sources. A multi?objective genetic algorithm optimization method is proposed to optimize the parameters of valve plate. The amplitudes of the swash plate moment and flow rates in the inlet and outlet ports are defined as the objective functions. The pressure overshoot and undershoot in the piston chamber are limited by properly constraining the highest and lowest pressure values. A comparison of the various noise sources between the original and optimized designs over a wide range of pressure levels shows that the noise sources are reduced at high pressures. The results of the sound pressure level measurements show that the optimized valve plate reduces the noise level by 1.6 d B(A) at the rated working condition. The proposed method is e ective in reducing the noise of axial piston pumps and contributes to the development of quieter axial piston machines.     

电动客车制动和转向复合驱动机组研制

为了实现电动客车有效利用电能、减轻自身质量、合理优化布局和降低成本等目标,对电动客车技术现状做了分析,提出了一种电动客车空压机和转向油泵复合机组,即采用一台电机同时驱动气压制动系统的空压机和动力转向系统的液压油泵.运用底盘优化布置、负载检测主动适配控制、动态优化设计和防震隔振控制等技术进行设计,通过能耗对比、动态性能、零部件匹配性和控制系统可靠性等试验,结果表明,具有减轻整车质量、节省成本、降低能耗和方便布置等特点.     

Measurement of the temporary shear stability of lubricants in a gear pump

In specially designed test equipment, consisting of a hydraulic pump loop capable of measuring oil flow rate for given output pressures, the authors have shown that increased output pressure results in an actual decrease in flow rate, this decrease being linear. It is concluded that some ‘leakage’ takes place between the gears and the pump housing, which increases when decreasing the oil velocity, for a given output pressure and temperature. Models are presented which provide a good representation of internal leakage observed in practical tests of various fluids.