机械基础寒假作业

机械基础寒假作业

姓名: 班级: 学号:

一填空题

1.我国古代人民在机械方面有许多杰出创造发明，晋朝时的和，应用了凸轮原理，西汉的指南针和记里鼓车应用了。

2.构件是的单元；零件是的单元。

3.运动副按形式不同，可分为和，其中高副为运动副，低副为运动副，齿轮传动为副。

4、普通螺纹的牙型角是，它的螺纹截形是；梯形螺纹的

牙型角为。

5、螺距是指两牙在中径线上对应两点间的距离。

6、公制普通螺纹同一直径按可分为细牙螺纹和粗牙螺纹。

7、相同直径的粗牙螺纹要比细牙螺纹的强度要，自锁性要。

8、用于螺纹密封的管螺纹的特征代号以字母表示，其中RP表示内螺纹，

R表示螺纹。

9、螺旋传动的特点有：传动高、工作、无噪声、结构。

10、联接螺纹大多数是用线，形螺纹。

11.渐开线上各点处的齿形角，对于同一基圆的渐开线，离基圆越远的齿形角，基圆上的齿形角。齿形角越，齿轮传动越省力。

12.在滚子链结构中，销轴和外链板、套筒和内链板都采用配合连接，套筒和销轴、套筒和滚子都采用配合连接。

13.当采用开口销和弹性锁片接头形式时，链节数为数，.当采用过渡链节接头形式时，链节数为数。

14.渐开线上的各点的曲率半径，离基圆越远，其曲率半径越，渐开线越。离基圆越近处，其曲率半径越，渐开线越。

15.圆柱齿轮副正确啮合条件是；

。

16.模数越大，轮齿越，齿轮所承载的能力；反之模数越小，轮齿越，齿轮所承载的能力。

17.齿顶高系数符号用表示，标准直齿圆柱齿轮的齿顶高系数等于

。

18. 顶隙系数符号用表示，标准直齿圆柱齿轮的顶隙系数等于

。

19.为了齿轮副连续顺利的传动，在前一对齿轮尚未结束啮合时，后面的齿轮已进入状态；重合度 1。重合度越大，传动越

。

20、由一系列相互啮合的齿轮组成的传动系统叫。

21.按轮系传动时齿轮的在空间的相对位置是否

,可将轮系分为和.

22.轮系中惰轮的只能改变的旋转方向，不能改变轮系的

大小。

二选择题

1.车床上丝杠和螺母组成的运动副（）

A连动副 B螺旋副 C转动副 D高副

2以下不属于机器的是（）

A数控机床 B滚动螺旋传动 C机器人 D内燃机

3.效率低的运动副接触形式（）

A齿轮接触 B凸轮接触 C螺旋接触 D滚动轮接触

4、但单根三角带所能传递的功率主要与以下因素有关：（）

A、带速、型号、小带轮直径

B、转速、型号、中心距

C、小带轮包角、型号、工作情况

D、小带轮直径、小带轮包角、中心距

5、三角带带轮轮槽夹角应（）三角带横截面夹角

A、大于

B、略小于

C、小于或等于

D、大于或等于

6、带传动的主要失效形式是（）

A、带的拉断

B、带的磨损

C、打滑

D、打滑和疲劳破坏

7、三角带合适的工作速度V应为（）

A、V≤5m/s

B、V≥20m/s

C、5m/s≤V≤25m/s

D、V≥30m/s

8、微调差动螺旋传动的每转的位移量L与每段螺纹的导程Sa、Sb 三者之间的关系表达为

A、L=Sa+Sb

B、L=Sa×Sb

C、L=Sa—Sb

D、L=Sa/Sb

9．链传动中，主要用于运输机械驱动输送带的是（）。

A．起重链 B．牵引链C．驱动链D．传动链

10．套筒滚子链中，以下各配合中为过盈配合的是。（）

A．销轴与套筒B．销轴与外链板

C．销轴与内链板D．套筒与外链板

11.定轴轮系的传动比与惰轮的齿数关系是( )

A有关 B无关 C成正比 D成反比

12.用箭头表示回转方向很广泛使用,而传动比公式计算传动比大小及方向判断,只适用于( )

A相交轴圆柱齿轮传动的轮系B平行轴圆柱齿轮传动的轮系

C相错轴圆柱齿轮传动的轮系D圆柱传动的轮系

三、简答题

1．如图0-1所示凸轮机构由构件支架、凸轮和从动件组成。试分析有几个

运动副？它们属于何种运动副？

图0-1

2.T V24×15（P7.5）LH—5H—L

3.说明压力角、基圆半径、曲率半径对渐开线的影响？

4.什么是定轴轮系和周转轮系?

四.计算题

1、已知平型带传动中，D1=120，D2=300，中心距A=1200求：

（1）开口式传动时的传动比是多少？

（2）验算包角

（3）计算平型带的计算长度

若包角刚好为极限度数时，其他条件不变，求此时中心距是多少？

2、如下图所示：固定螺母的导程Ph1＝1.5 mm，活动螺母的导程Ph2＝2 mm，螺纹均为左旋，问当螺杆转动5圈时，活动螺母的移动距离是多少？移动方向如何？

螺杆（向里）

3.一对相啮合的标准圆柱齿轮（h

a *=1 ，C*=0.25）。已知Z

1

=21，Z

2

=63，模数m=4mm，

试计算d、d

a、d

f

、d

b、

p、s、e、h

a

、h

f

、h、a。

4在图2所示的定轴轮系中, 已知n=1440r/mln, Z1=Z3=Z6=18,Z2=27,Z4=Z5=24,Z7=81.求末轮7转速？并用箭头在图中标明各齿轮回转方向.

z1

z2

z3图2

z4

z5z6

z7

5如图4所示，Z1=26，Z2=51，Z3=42，Z4=29，Z5=49，Z6=36，Z7=56，Z8=43，Z9=30，Z10=90，轮1的转速n1=200 r/mln ，求当轴Ⅲ上的三联齿轮分别与轴Ⅱ上的三个齿轮啮合时，轴Ⅳ的各种转速？

图4

10

9

87

6

5

4

3

2

1

n1

五探索题

1. 复习前面1-4章

2. 预习后面5-11章

3. 写一篇关于机械专业就业前景的社会调查.(1000字左右)

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