2021年机械基础期末试卷与答案.pdf

机械基础期末试卷A 卷一、填空题（每空1 分，共 30 分）1.机器一般由动力部分、传动部分、控制部分和 执行部分组成。2.机构中至少有一个运动副是高副 机构，称为高副机构。3.安装 V带带轮时，两个带轮的轴线应相互平行，两个带轮轮槽的对称平面应 重合。4.根据螺纹牙型的不同，可分为三角形螺纹、矩形螺纹、梯形螺纹和锯齿形螺纹等。5.按螺旋线的线数分类，螺纹可分为单线螺纹和 多线 螺纹。6.螺旋传动常用的类型有传力螺旋传动、传动螺旋传动和调整螺旋传动等。7.链传动按用途可分为传动链、输送链和 起重链 等。8.渐开线的形状取决于基圆 的大小。9.国家标准规定，渐开线圆柱齿轮分度圆上的齿形角等于20。10.齿轮齿条传动的主要目的是将齿轮的旋转 运动转变为齿条的直线 运动。11.开式齿轮传动中主要的失效形式是轮齿折断和 齿面磨损。12.在蜗杆传动中，由于摩擦产生的热量较大，所以要求有良好的润滑，其润滑方式主要有油池润滑和 喷油润滑。13.按照轮系传动时各齿轮的轴线位置是否固定，轮系分为定轴轮系、周转轮系 和 混合轮系。二、判断题（每题1 分，共 10 题）1.高副能传递较复杂的运动。（）2.零件是运动的单元，而构件是制造的单元。（）3.V 带的根数影响带传动的能力，根数越多，传动功率越小。（）4.按螺线线形成所在的表面不同划分，螺纹分为外螺纹和内螺纹。（）5.相互啮合的内外螺纹，其选项相同，公称直径相同。（）6.螺旋传动常将主动件的匀速直线运动转变为从动件的匀速回转运动。（）精品w o r d 学习资料 可编辑资料-精心整理-欢迎下载-第 1 页，共 5 页7.因渐开线齿轮能够保证传动比恒定，所以齿轮传动常用于传动比要求准确的场合。（）8.开式传动和软齿面闭式传动的主要失效形式之一是轮齿折断。（）9.蜗杆传动常用于加速装置中。（）10.在轮系中，惰轮既可以是前级的从动轮，也可以是后级的主动轮。（）三、选择题（每题1 分，共 20 分）1.下列装置中，属于机器的是（A）A内燃机 B.台虎钳 C.自行车2.机构和机器的本质区别在于（A）A是否做功或实现能量转换B是否由许多构件组合而成C 各构件间是否产生相对运动3.下列机构中的运动副，属于高副的是（A）A火车车轮与铁轨之间的运动副B螺旋千斤顶中螺杆与螺母之间的运动副C 车床床鞍与导轨之间的运动副4.V 带在轮槽中的正确位置是（C）。A.B.C.5.（B）是带传动的特点之一。A传动比准确B在过载时会产生打滑现象C 应用在传动准确的场合6.V 带安装好后，要检查带的松紧程度是否合适，一般以大拇指按下带（B）mm左右为宜。A5 B.15 C.20精品w o r d 学习资料 可编辑资料-精心整理-欢迎下载-第 2 页，共 5 页文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 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ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M37.用螺纹密封管螺纹的外螺纹，其特征代号是（A）AR B.Rc C.Rp8.同一公称直径的普通螺纹可以有多种螺距，其中螺距（C）为粗牙螺纹。A最小 B.中间 C.最大9.台虎钳上的螺杆采用的是（A）螺纹。A三角形 B.锯齿形 C.矩形10.（B）具有传动效率高、传动精度高、摩擦损失小，使用寿命长的优点。A普通螺旋传动 B.滚珠螺旋传动C.差动螺旋传动11.机床进给机构若采用双线螺纹，螺距为 4mm，设螺杆转 4 周，则螺母（刀具）的位移量是（C）mmA4 B.16 C.3212.要求传动平稳性好、传动速度快、噪声较小时，宜选用（B）。A.套筒滚子链 B.齿型链 C.多排链13.链的长度用链节数表示，链节数最好取（A）。A偶数 B.奇数 C.任意数14.为保证渐开线齿轮中的轮齿能够依次啮合，不发生卡死或者冲击，两啮合齿轮的（A）必须相等。A.基圆齿距 B.分度圆直径 C.齿顶圆直径15.以下各齿轮传动中，不会产生轴向力的是（A）。A.直齿圆柱齿轮 B.斜齿圆柱齿轮 C.直齿圆锥齿轮16.蜗杆传动中，蜗杆与蜗轮轴线在空间一般交错成（C）。A30 B.60 C.9017.齿轮和轴之间滑移，是指齿轮与轴周向固定，齿轮可沿（B）滑移。A.周向 B.轴向 C.周向与轴向18.在轮系中，两齿轮间若增加（B）个惰轮时，首、末两轮的转向相同。A偶数 B.奇数 C.任意数精品w o r d 学习资料 可编辑资料-精心整理-欢迎下载-第 3 页，共 5 页文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 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ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M319.轮系的末端是螺旋传动，已知末端轴转速n=80r/min，三线螺杆的螺距为4mm，则螺母每分钟移动的距离为（C）mm。A.240 B.320 C.96020.轮系的末端是齿轮齿条传动，已知小齿轮的模数m=3mm，齿数 z=25，末轴转速 n=75r/min，则齿条每分钟移动的距离为（A）mm。A.17662.5 B.5625 C.5887.5四、术语解释（每题2 分，共 5 题）1.节距相邻螺纹轮廓上对应点之间的距离。或者是指链条滚子之间的中心距离2.传动比主动轮与从动轮转速比或者它们齿数之反比3.轮系由一系列相互啮合的齿轮所组成的传动系统称为轮系4.液体帕斯卡原理在密闭容器中，液体中任一部分的压力以相等的值传递到连通容器的各个部分。5.蜗轮中间平面过蜗杆轴线并与蜗轮轴线垂直的平面五、计算题（共 30 分）1.如下图所示双螺旋传动中，螺旋副 a：Pha=2mm，左旋；螺旋副 b：Phb=2.5mm，左旋。当螺杆按下图所示的转向转动0.5 周时，活动螺母 2 相对导轨移动多少距离？其方向如何？（6 分）L=（Phb-Pha）0.5=0.25mm方向指向右精品w o r d 学习资料 可编辑资料-精心整理-欢迎下载-第 4 页，共 5 页文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M32.机床因超负荷运转，将一对啮合的标准直齿圆柱齿轮打坏，现仅测得其中一个齿轮的齿顶圆直径为96mm，齿根圆直径为 82.5mm，两齿轮中心距为135mm。试求两齿轮的齿数和模数。（6 分）da1=m（z1+2），df1=m（z1-2.5）由上两式可得 m=3，z1=30a=0.5（da1+da2）=0.5 m（z1+z2）得 z2=603.已知与齿条啮合的齿轮转速n=100r/min，齿数 z=20，模数 m=3mm。求齿条的移动速度。（8 分）V=nd=1003.14 320=18840mm/min=18.84m/min4.如图所示定轴轮系中，已知 n1=720r/min，各齿轮的齿数分别为：z1=20，z2=30，z3=15，z4=45，z5=15，z6=30，蜗杆 z7=2，蜗杆 z8=50。求：（1）该轮系的传动比i18.（2）蜗轮 8 的转速 n8.（3）用箭头在图中标出各轮转动方向。（10 分）（1）i18=（z2/z1）（z4/z3）（z6/z5）（z8/z7）=1.5 3225=225（2）n8=n1/i18=720r/min/225=3.2r/min（3）8 轮 逆时针转动精品w o r d 学习资料 可编辑资料-精心整理-欢迎下载-第 5 页，共 5 页文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 ZK7R5U2R5M3文档编码:CF1C8M4Z7X8 HA1H6K7W9M4 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