共查询到19条相似文献,搜索用时 281 毫秒
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行星齿轮传动结构通过多个行星轮内啮合均衡分配载荷、分流功率,具有体积小、承载力强等优势。行星齿轮传动时,构件间可以自动补偿误差、均匀分布载荷,方法相对简便,均载机构也成为行星齿轮理想的传动方法。就行星齿轮均载传动展开研究,分析行星齿轮荷载不均衡现象的原因,阐述传动方法,研究其结构形式以供参考。 相似文献
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本文建立了直齿轮传动的振动方程,方程中考虑了轮齿啮合刚度的周期变化和啮合当量综合误差,并对轮齿啮合刚度和啮合当量误差进行了数学上的处理,使振动方程既不失一般性又得到了简化。按此方程对直齿轮传动的振动进行分析和计算,其结果可靠。 相似文献
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汇流行星排是履带车辆综合传动装置中起到分流与汇流作用的重要部件,其功率损失直接影响系统综合传动性能。根据汇流行星排齿轮系统的结构及运行参数,分析了不同转速与负载功率时,齿轮啮合功率损失、轴承功率损失、搅油功率损失与风阻功率损失的变化规律;开展了不同转速和负载功率下的汇流行星排传动性能测试。结果表明,随着负载功率的上升,系统功率损失也逐渐增加。当负载功率恒定时,随着齿轮转速提高,系统功率损失越大,与理论分析的一致性较好。所得结论对整车燃油经济性评估提供了理论与试验支撑。 相似文献
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针对机器人用谐波减速器在使用过程中出现的精度保持性差的现象,分析影响谐波传动啮合精度的因素,一个重要原因是谐波减速器中刚轮和柔轮的啮合齿形有磨损,使啮合规律改变,发生器的廓线无法满足新的啮合规律,造成柔轮和刚轮齿啮合过程有偏差,使谐波减速器的整体运行精度降低。选取一款谐波减速器为研究对象,以探索柔轮齿部修形对精度保持性的影响效果为研究目标,运用综合性能测试台和寿命试验台进行试验,对谐波减速器柔轮齿部修形前和修行后的精度及精度保持性进行分析研究。得出,柔轮齿部修形可以将谐波传动啮合精度的保持性提升约52%,所以在谐波减速器设计过程中,可以采取对柔轮齿部修形的办法,降低啮合过程中齿部干涉造成的磨损,进一步提高谐波传动啮合精度的保持性。 相似文献
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针对行星轮系带止口花键的齿圈,中频感应轮齿部分,花键近齿顶部位出现淬硬不足或硬度不满足图纸要求的现象,设计一种感应淬火仿形工装,补偿了花键部位齿顶高与轮齿部位齿顶高的高度差,使花键部位与轮齿部位的硬度均满足设计要求,为装配使用行星轮系机械设备可靠运行提供了积极的便利条件,提高了设备的使用寿命。 相似文献
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本文通过对圆弧齿轮及渐开线齿轮的跑合划痕纹理方向的分析,证明圆弧齿轮跑合划痕对形成齿面间的弹流润滑有利,而渐开线齿轮的跑合划痕对齿面间形成弹流润滑不利。由此可知,跑合对圆弧齿轮承载能力的提高要比渐开线齿轮明显得多。 相似文献
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本文提出了一种多目标函数的优化方法,即二次优化法,并且用之求解了齿轮在胶合强度与弯曲强度条件下的综合最佳变位系数。 相似文献
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抽油机皮带张紧装置可靠性设计与改进 总被引:1,自引:1,他引:1
结合采油现场,通过综合分析抽油机调整皮带操作流程的表现形式,提出了研制抽油机皮带张紧装置,优化皮带轮传动系统结构,改变现有抽油机皮带调整方式的设计方案.应用FMEA方法对张紧系统、支架系统和从动系统进行故障模式影响分析,确定了经济合理、满足现场需要的改进方案.经过可靠性试验筛选,研制成功了抽油机皮带张紧装置,在实现手动张紧皮带的同时,弹簧自动复位张紧装置能够动态调整抽油机皮带的张紧度,可靠性增强,现场操作效率大大提高,推广应用前景广阔. 相似文献
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介绍了一种新型节电防窃抽油机拖动装置及其油田现场应用情况,这种装置由1.14kV超高转差异步电动机和控制保护装置构成,与配电保护变压器和卡锁装置跌落熔断器一起组成采油井电力及驱动系统的节电,防窃电系统,现场应用表明,这种装置节电效果显著,同时解决了油井的窃电问题,适合油田使用。 相似文献
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Benno Buehler 《The Journal of industrial economics》2015,63(4):642-672
This paper develops a model of international roaming in which mobile network operators (MNO's) compete both on the wholesale market to sell roaming services to foreign operators and on the retail market for subscribers. To allow their subscribers to place or receive calls abroad, they have to buy roaming services provided by foreign MNO's. In the absence of international alliances, competition between foreign operators would drive wholesale unit prices down to marginal costs. However, international alliances are endogenously formed since they serve as a commitment device to soften competition on the retail market, leading to excessively high roaming per‐call prices. 相似文献
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Katerina Nicolopoulou Mine Karataş-Özkan Christopher Vas Muhammad Nouman 《R&D Management》2017,47(3):368-384
In the context of incubators, particularly those that are driven to achieving social objectives, this paper investigates core processes that support the development of social innovation. Social innovation, as this paper argues, is underpinned by a new form of social collaboration and engagement built upon strong forms of sharing knowledge and learning. Coupled with this is the element of social capital reinforced by entrepreneurship and leadership that promotes sustainability in the community. These factors drive innovative thinking and ways of engaging among stakeholders in order to create new forms of socio-economic impact. Such value-creating activity occurs in firms that operate within incubators involving a wide range of stakeholders who work through networks to co-create and meet social challenges. Through a case study of a social incubator and an incubatee, we demonstrate the core processes that irradiate the argument on social innovation. The contribution of this paper is threefold: First, social innovation is an emerging area of research, of which there is a dearth in terms of examining the processes empirically. We address the gap in this field by demonstrating the value of social collaboration and engagement using different innovation models. Second, we establish links between social innovation and incubation using the concept of social capital. This allows us to achieve our third contribution: exemplification of a dyadic value-based partnership and collaboration processes between an incubator and an incubatee, through activities driven by social innovation that aim to have social impact. The paper concludes with practice implications and suggests directions for future research. 相似文献
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采用顶驱钻井作业提高工作的安全性 总被引:1,自引:0,他引:1
沈泽俊 《石油工业技术监督》2006,22(1):45-47
简述了DQ70BS顸驱的结构、工作原理和技术特点。现场应用表明,采用顸驱作业有利于提高钻井作业效率,减少事故,提高工作的安全性。 相似文献
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为了提高卷筒纸输纸装置的稳定性,降低设备成本,必须对输纸装置结构进行动力特性分析和优化设计。本文通过纸卷陀螺效应的动力学分析,得到纸卷偏心量与轴承载荷之间的关系曲线,发现偏心量的微量变化会引起轴承载荷的成倍增加。运用有限元分析方法对输纸装置进行振动特性研究,得到输纸装置前六阶固有频率和主振型,为卷筒纸输纸装置的结构改进提供了理论依据。 相似文献
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This paper seeks to advance our understanding of recruitment strategies focusing on a hitherto undeveloped research area, which scrutinises the relationship between social media and recruitment strategies in the context of facilitating international migration. The case study used to explore this activity is migrant workers from Poland seeking and engaging in employment in the UK hospitality sector. Using empirical findings, the paper outlines the role of the Internet fora as a transnational platform for job searching and job advertising, emphasising migrants' role as recruitment agents. 相似文献