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Англ. мова. Київ, 2009. Посібник для механіків,...doc
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5. Make up the dialogues on the following topics using the participles as well as the introductory and connective words.

1. The difference between coupling and clutches. 2. Kinds of

couplings. 3. Kinds of clutches. 4. The principle of their operation. 5. The conditions of operation. 6. Application and advantages / disadvantages in operation, maintenance and wear.

in this case, in case of, provided, on one hand, on the other hand, especially, it is required that, it is desired that, on condition, in general, in particular, in detail, in connection with, according to, to add, to continue.

Text 3

1. Scan the text for the types of keys and their purpose. Compare their function with those of other transmitting mechanisms.

Types of Keys

The main function of a key is to trans­mit torque between a shaft and a machine part assembled on it.

In most cases keys prevent relative mo­tion, both rotary and axial. In

some constructions keys allow an axial motion, between the shaft and the

hub. Sucn keys are called feather spline keys. According to various characteristics, keys can be distinguished as straight and tapered,

rectangular, dovetailed, chamfered, round, and discshaped, radial and.

tangential, and accor­ding to their use, for light duty and for heavy duty.

Fig. 18. Keys.

Vocabulary

assemble збирати

hub втулка

slip, slidе ковзання

journal цапфа

rub терти

rock коливатися

supply постачання, подача

shaft вал

driver, impeller привід

feather / spline key напрямна шпонка

tapered нарізний

light duty невеликий строк експлуатації

2. Use the given introductiry words to agree or disagree with the statements below. Give your comments.

1.A key doesn't transmit torque between a shaft and machine

part. 2. In most cases keys prevent relative motion, both rotary and axial. 3. In constructions where keys do not allow an axial motion between

the shaft and the hub are called feather or spline keys. 4. There are only two types of keys: straight and tapered. 5. According to various characteristics the keys can be used only for light duty. 6. One can give a simple, all-embracing classification oi keys.

3. Answer the questions on the text.

1. What is the main function of a key? 2. How many key types are in use? 3. Where are the keys used?

4. Find in the text the equivalents of the Ukrainian words and

expressions:

згідно з, розрізнятися рисами, в більшості, дозволяти аксiальний рух, між валом та втулкою, передавати обертальний момент, зібрана деталь, випереджувати відносний рух, напрямна шпонка, нарізна шпонка, пристрій для роз’ємного з’єднання, засновуватися на, поділятися на, велике навантаження, риси переплітаються, всеохоплююча класифікація,

з’єднувати постійно, для полагодження, муфта дозволяє, зовнішня муфта, застосовується в напрямку, паралельно восі обертання, брати до уваги, належна робота.