BEARING CLOSURES
Date: 2015-10-07; view: 531.
Rolling-element bearings are made with a wide variety of closures. Basically, they are open, shielded, or sealed (Figs. 3 and 4). Shielded bearings have a small clearance between the stationary shield and rotating ring. This provides reasonable exclusion of dirt without an Fig. 3 Fig. 4 increase in friction. Sealed bearings have a flexible lip (usually synthetic rubber) in contact with the inner ring. Friction is increased, but more effective retention of lubricant and exclusion of dirt is obtained. Seals should not be used to seal a fluid head or at high speeds.
NOTES:
Rolling element – ò³ëî/ åëåìåíò êî÷åííÿ
Bearing – ï³äøèïíèê
Lubricant – çìàùóâàëüíèé ìàòåð³àë
Support – îïîðà,
Figure – ÷èñëî, ðîçðàõóíîê
Retainer – ñåïàðàòîð ï³äøèïíèêà
Width – øèðèíà
Raceways – ê³ëüöå ï³äøèïíèêà êî÷åííÿ, íàïðÿìíà
Cages – ñåïàðàòîð
Closures – ïåðåìè÷êà, ïåðåãîðîäêà
Sealed element – óù³ëüíþþ÷èé åëåìåíò
That's how we express agreement and disagreement in English. Study this table.
| HOW TO EXPRESS AGREEMENT AND DISAGREEMENT: Yes, it is / does. No, it isn't / doesn't. Certainly. Certainly not. I quite agree with you. No, you are wrong. You are quite right. You are mistaken. I'm afraid. I think so. Far from it. I can't but agree with you. I disagree. Absolutely right. I can't agree with you. I agree only to some extent. I'm of the opposite opinion. |
Task 4. Answer the following questions:
1) What is rolling-contact bearing?
2) What parts of bearing can you name?
3) What is the main function of cage in a bearing?
4) A wide variety of rolling-contact bearings are normally manufactured to standard boundary dimensions and tolerances, aren't they?
5) What is a closure? Where can it be used?
6) There is a wide variety of closures. Name them.
7) Each basic type of bearing is furnished in several standard ‘‘series'', isn't it?
8) Sealed bearing has a rigid synthetic lip, isn't it?
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| PRINCIPAL STANDARD BEARING TYPES | | | Task 6. Match the pictures and terms in column A with their definitions in column B |