基本齿轮|Machine Design – Interview Questions and answers

在这篇文章中，我们将看到与齿轮基本有关的面试问题，齿轮类型，齿轮制造。这个问题和答案对准备Viva，口头，采访的机械学生有用。

1. Mention some applications of gear drives.
Gear drives are employed in many fields such as from smaller instruments to the heaviest
and most powerful machines,crushers etc. Some of the common applications of gears
are in hoisting machinery, rolling mill, machine tools such as lat machines, etc.

2.齿轮分类为什么？
齿轮基于
(a) Axes of gear shafts as
i) Parallel –例如。spur, helical, herring-bone gears.

ii）交叉 -例如。锥齿轮。

iii）非平行和非交叉 -例如 - 蠕虫，齿轮，歪斜齿轮。
(b) Profile of gear tooth –i) Involute gears. ii) Cycloidal gears.
(c) Position of teeth on wheel rim.
(D) Tooth parallel to axis of gear –例如。Spur gears. ii) Tooth inclined to axis of gear – Eg. Helical gears.
（d）压力角 - i）齿轮，201压角度。ii）具有14 1/20压力角的齿轮。

也可以看看 ：齿轮类型，用于齿轮的材料，设计规格和应用

3.Illustrate the materials for making gears .
1.碳钢如碳钢，镍，铬和钒的合金钢等黑色金属。
2. Cast-iron of different grades.
3. Non-ferrous metals such as brass, bronze, etc.
4. Non-metals like phemolic resins nylon, bakelite etc.
其中，具有适当的热处理的钢是广泛的，在“工程应用”中的许多中使用。

4.指定齿轮故障的类型。
a）牙齿破损。b）牙齿表面的蚀。c）磨损磨损。d）抓住牙齿等

5.在什么occasions使用非金属齿轮。
使用非金属齿轮'我们需要静音操作和低功率传输。

例如，在仪器中，如压力表等。

6. How are the following terms defined?
a）压力角（a）是通过与配合分析的音调圆圈共同的作用线的角度制造。
b) Module m is the ratio of pitch circle diameter to the number d of gear teeth, and is usually represented in millimetres.

7. Define the following terms.

a) Back lash齿厚度和空间之间的差异是沿音调圆圈测量的。如果我们假设齿厚度为t，并且空间宽度为t2然后backlash = t2-tl

b）齿轮比

(i) is the ratio of number of teeth of larger gear to that of smaller gear. At is also defined as the ratio of high speed to the low speed in a gear drive. Usually, the gear ratio should always be greater than one.

也可以看看 ：Basic Of Gears -Gear Terminology/ Gear nomenclature

8.选择齿轮驱动时应采用哪些初步设计考虑因素？
All kinds of gears can not be useful for all kinds of work. Hence following factors should be considered for selecting a specific type of gear drive.
i）要传输的资金金额。
ii）空间可用性。
iii) Amount of gear ratio for single step.
iv) Causes for gear failures and their preventing methods.
v）适当的材料
vi）需要齿轮的寿命，通常是10,000小时。

9. What is interference in gears? How can you overcome it?
齿轮轮廓通常开始，从底圈和尖端齿的端部采用这样的方式使得它们的接触沿着齿齿的顶表面进行，平坦，一个齿轮的齿的尖端将i挖掘到底部侧面配合齿轮。此操作称为干扰。

10.选择基础齿轮切割机？

Gear cutters are selected based on the following conditions.
1) Properties of materials for work piece and tools.
2) Cost of production.
3) Structure of gears such as spur gear, helical gears and so on.
4) Module of the gear.

也可以看看 ：19所有类型齿轮的制造方法

11. . How do gears fail?
a）齿轮可能由于牙齿破裂而通过过载和轴的未对准而失效。
b）通过不合适的润滑剂腐蚀牙齿。
c) tooth wear because of insufficient lubrication.
d）由于没有被削减而干扰。

12. What stresses are induced in gear tooth?
1. Surface compressive stress.
2.弯曲压力。

13. What is meant by a corrected gear?
在普通齿轮中，在基圆和根圈之间可能有一个底切，削弱了牙齿。通过在齿轮轮廓上进行一些修改，可以避免这种底切。此修改是附录修改或配置文件校正或轮廓偏移。具有这种校正的齿轮称为校正齿轮。

14.小间隙和何有程度的效果。齿轮上过​​度的间隙
太少的间隙可能导致加载，过热，最终癫痫发作，导致系统的最终失败。在过度的间隙上可能导致非均匀 - 传输运动。间隙也可能导致噪声和冲击载荷。

15.定义表单因素？
Form factor is a constant, employed in the design of gear which, design the shape and the
number of teeth.

16. What is helix angle? How this angle differentiate helical gear from
螺旋角 - 齿轮轴和通过牙齿面之间的角度。对于
螺旋齿轮，齿在倾斜轴上切割，指定为“厚度”及其值范围
从8度到25'旋转齿轮的情况，齿平行于轴切割，齿轮零。

17. What is a herringbone gears?
A herring bone gear is made of two single helical gears attached other hence called as double helical gear in which the teeth of be set in the opposite direction to the teeth of another gear arrangement the axial thrust produced in one gear will be null’, thrust produced in another gear, and the resultant thrust is improves the life of the gear.

18.什么是锥齿轮？
Bevel gear is the type of gear for Which the teeth are cut on conical surface in contrast with spur and helical gears for which the teeth are cut on cylindrical surfaces. The structure of bevel gear is similar to and uniformly truncated frustum of a cone.

19. Based on the included angle between the shaft axes, called as shaft angle
a) External gears < 900)
b) Internal gears > 90*)
c）冠齿轮90

20.在哪个齿轮驱动器中，可用自锁？
Self locking is available in worm-gear drive.

21.写一些蜗轮驱动器的应用。
蜗轮，驱动器找到铣床索引头，桌粉等广泛应用，
steering rod of automobile and so on.

22.蜗轮驱动器的优点和缺点是什么;
优点
1）用于非常高的速度比约为100
2) Smooth and noiseless operation.
3）可提供自锁设施。
Demerits
1）低效率。
2）产生更多热量，因此该驱动器可以在储油液中操作
or extra cooling fan is required in order to dissipate the heat from the drive.
3) Low power transmission.