طرق تثيبيت الاعمده والحدافات(shafts and wheels).

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PUSH FITTINGS
:20::20::20:

A large range of fittings for wheels, shafts and screw threads are available. Most fittings are temporary in that they can be tightened and untightened when required. The fitting below is strong, safe and low cost.​

fit1.gif

Push on fittings are very popular as they are simply pushed onto the steel / plastic shaft. They are made from hardened spring steel which makes them tough and flexible. They can only be pushed in one direction only (forwards). To remove them they must be forced backwards, this will damage them so that they cannot be used again. As they are very cheap and disposable, they can be replaced. They are suitable for light wheeled vehicles such as light trolleys.​

fit2.gif







SPLIT PINS

:20::20::20:​


A large range of fittings for wheels, shafts and screw threads are available. Most fittings are temporary in that they can be tightened and untightened when required. The fitting below is strong, safe and low cost.​


split1.gif


Split pins are very common as they are easy to use and effective. Often they are found on self-assembly trolleys, light wheel barrows, lawn mowers and similar items. They are usually made from ‘soft’ steel or aluminium and they come in a range of sizes.​



The shaft/axle is normally drilled so that the split pin can drop through or can be ‘tapped’ through with a hammer. The legs of the split pin are then bent to form an angle, holding the split pin and wheel in place.
A washer can be used to reduce friction between the split pin and the wheel. Split pins are strong but after time they can wear and break.​

splitp1.gif










LOCK NUTS

:20::20:​


lcnut1.gif


Lock nuts are very useful and are used by engineers and mechanics. The diagram opposite shows a wheel pushed onto a threaded shaft. Washers are placed on either side of the wheel and a lock nut is finally threaded in position. This is a highly effective method of securing a wheels on shafts / axles.​



A close look at the lock nut shows that it has a nylon sleeve. As the nut is tightened, the thread on the shaft / axle cuts into the nylon, holding it firmly in position.
As the wheel rotates a normal nut will loosen because of friction and vibration of the wheel. However, the nylon holds the nut firmly in position.​

lcnut2.gif

An alternative is to use two threaded nuts as seen in the drawing above. The second locks the first in position and in this way keeps the wheel firmly in position.​










COMBINATION LOCK NUT AND SPLIT PIN



lcnut3.gif



Another effective locking fitting is a combination of a split pin and lock nut. The split pin drops through a hole in the threaded shaft and rests in a ridge on the surface of the nut (see animation below). The nut cannot become loose because the split pin stops it rotating.
split1.gif

This type of locking systems is seen on high speed rotating axles / shafts where vibration may slowly loosen the lock nut. On some machines / vehicles, if lock nuts loosen, serious accidents can take place. One disadvantage of this type of locking system is that the nut has to be threaded to the right place on the threaded shaft so that the split pin can be positioned accurately. On the other hand, the lock nut is securely 'locked' in position.​

lcnut4.gif






منقول للافاده



:75::75::75:​
 

مواضيع مماثلة

د.محمد باشراحيل

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بارك الله فيكِ مهندسة عبير
لك جهد مشكور ومداخلات مميزة

وفقك الله
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بارك الله في الاخت عبير وكل عام وجميع اعضاء المنتدي الفخم بخير في جميع الدول العربيه
 

engsoqrat

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جزاكي الله كل خير وجعله في ميزان حسناتك
 

mnci

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