电子文档交易市场
安卓APP | ios版本
电子文档交易市场
安卓APP | ios版本

机械原理 英汉双语 教学课件 ppt 作者 张春林 Chapter 8 Design of Gear Trains

26页
  • 卖家[上传人]:E****
  • 文档编号:89497347
  • 上传时间:2019-05-25
  • 文档格式:PPTX
  • 文档大小:576.48KB
  • / 26 举报 版权申诉 马上下载
  • 文本预览
  • 下载提示
  • 常见问题
    • 1、Chapter 8 Design of Gear Trains,8.1 Classification of Gear Trains,A gear train is a combination of gears used to transmit motion from one shaft to another. Fig 8-1a shows a gear box in an automobile; there are many pairs of gears to transmit different motion. Fig 8-1b shows a quartz watch in which the hour hand, minute hand and second hand rotate as their definite gear ratios to indicate the times.,Fig.8-1 Application of gear trains(轮系的应用) 1、2clutch (离合器) 3、4driving shaft (输入轴) 5gear train (轮系),

      2、1.Ordinary Gear Trains,1) Simple ordinary gear train. It is a gear train in which each shaft carries only one gear, as shown in Fig 8-2a. 2) Compound gear train. It is a gear train in which at least one shaft carries more than one gear, as shown in Fig 8-2b. This will be a parallel or series parallel arrangement, rather than the pure series connections of the simple gear trains. 3) Reverted gear train. If the axes of input gear and output gear in a compound gear train are coincident, this is cal

      3、led a reverted gear train, as shown in Fig 8- 2c.。,Fig.8-2 Classification of ordinary gear trains (定轴轮系分类),2.Epicyclic Gear Trains,A gear train having a relative motion of axes is called a epicyclic gear train or planetary gear train, as shown in Fig 8-3a. If the axes of the gears in an epicyclic gear train are fixed, these gears are called sun gears or central gears, such as gears 1 and 3 in Fig 8-3a, denoted as K. The gear whose axis rotates about the axes of the sun gears is the planet gear,

      4、such as gear 2. The link which is pivoted to the frame at point O and carries the planet gear 2 to maintain gears 1, 2 and 3 in mesh is the arm or planet carrier, denoted as H.,Fig.8-3 Epicyclic gear train (周转轮系),3.Combined Gear Trains,Fig.8-4 Combined gear trains (混合轮系),Quite often a gear train may contain the combination of ordinary gear trains and epicyclic gear trains or some planetary gear trains. Fig 8-4a shows a gear train which consists of an ordinary gear train and a planetary gear trai

      5、n. Fig 8-4b shows a gear train which consists of two planetary gear trains in series connection.,8.2 Ratio of Ordinary Gear Trains,we will study how to determine the ratios of the gear trains. The ratio of a gear train is that the angular velocity of the input gear is divided by the angular velocity of the output gear, denoted as:,Where in is the angular velocity of the input gear, and out is the angular velocity of the output gear.,Fig.8-5 Planar ordinary gear trains(平面定轴轮系),(1) Parallel axis o

      6、rdinary gear trains The following example will provide us with a general rule to determine the ratio of ordinary gear trains.,Equation can be written as:,(2) Spatial ordinary gear trains The formula of calculating the ratio is the same with the parallel gear trains, but the (-1) m can not be used to determine the rotating direction of the output gear. A spatial ordinary gear train is illustrated in Fig 8-6, and all the numbers of teeth of gears are known.,Fig.8-6 Spatial ordinary gear trains (空间

      7、定轴轮系),(3) Summary,1) The angular velocity ratio of an ordinary gear train is equal to the product of driven tooth numbers divided by the product of driving tooth numbers. 2) The angular velocity ratio of an ordinary gear train is also equal to the product of the angular velocity ratio of each pair of meshing gears. 3) The idle gear, whose number of teeth is canceled in equation calculating the ratio, hence is used to change the direction of rotation. 4) If all the shafts are parallel in the gear

      8、 train, the sign of the train value depends on the number of the external gears.,Example 8-1 Fig 8-7a illustrates a spatial gear train, in which all the numbers of teeth of gears are known. The worm is the driving gear and has a right hand. Determine the angular velocity ratio i15.,Fig.8-7 Ratio of the spatial ordinary gear trains (空间定轴轮系的传动比),8.3 Ratio of Epicyclic Gear Trains,1.Converted Gear Train,Consider the epicyclic gear train shown in Fig 8-8a, in which the absolute velocities of gears 1

      9、, 2, 3 and the arm H are 1, 2, 3 and H respectively. Now, suppose that the train is inverted at an angular velocity which is equal to that of the arm but the direction is opposite, then the arm is considered to be in stationary, see Fig 8-8b. We call this inverted train a converted gear train, which an imaginary ordinary gear train.,Fig.8-8 Ratio of the epicyclic gear trains (周转轮系传动比),Tab 8-1,The angular velocities of gears 1, 2, 3 and the arm H in the converted train are H 1 , H 3, H 2 and H H respectively. The absolute angular velocities of all the members and the angular velocities relative to the arm are shown in Tab 8-1.,In the converted gear train, if gear 1 and gear 3 are input and output gears, the ratio is as follows:,This equation can solve the ratios of any epicyclic gear train, but basic principle must be made clear, for example, iH1ki1k. Its value is iH1k=H1/Hk ,and its value is i1k=1/k. It must be emphasized that the first ar and

      《机械原理 英汉双语 教学课件 ppt 作者 张春林 Chapter 8 Design of Gear Trains》由会员E****分享,可在线阅读,更多相关《机械原理 英汉双语 教学课件 ppt 作者 张春林 Chapter 8 Design of Gear Trains》请在金锄头文库上搜索。

      点击阅读更多内容
    最新标签
    发车时刻表 长途客运 入党志愿书填写模板精品 庆祝建党101周年多体裁诗歌朗诵素材汇编10篇唯一微庆祝 智能家居系统本科论文 心得感悟 雁楠中学 20230513224122 2022 公安主题党日 部编版四年级第三单元综合性学习课件 机关事务中心2022年全面依法治区工作总结及来年工作安排 入党积极分子自我推荐 世界水日ppt 关于构建更高水平的全民健身公共服务体系的意见 空气单元分析 哈里德课件 2022年乡村振兴驻村工作计划 空气教材分析 五年级下册科学教材分析 退役军人事务局季度工作总结 集装箱房合同 2021年财务报表 2022年继续教育公需课 2022年公需课 2022年日历每月一张 名词性从句在写作中的应用 局域网技术与局域网组建 施工网格 薪资体系 运维实施方案 硫酸安全技术 柔韧训练 既有居住建筑节能改造技术规程 建筑工地疫情防控 大型工程技术风险 磷酸二氢钾 2022年小学三年级语文下册教学总结例文 少儿美术-小花 2022年环保倡议书模板六篇 2022年监理辞职报告精选 2022年畅想未来记叙文精品 企业信息化建设与管理课程实验指导书范本 草房子读后感-第1篇 小数乘整数教学PPT课件人教版五年级数学上册 2022年教师个人工作计划范本-工作计划 国学小名士经典诵读电视大赛观后感诵读经典传承美德 医疗质量管理制度 2 2022年小学体育教师学期工作总结 2022年家长会心得体会集合15篇
    关于金锄头网 - 版权申诉 - 免责声明 - 诚邀英才 - 联系我们
    手机版 | 川公网安备 51140202000112号 | 经营许可证(蜀ICP备13022795号)
    ©2008-2016 by Sichuan Goldhoe Inc. All Rights Reserved.