السبت، 1 يونيو، 2013

bearings


In this publication are talking about the bearings  in each and every part rotator to maintain the smoothness recycling and not to damage the rotary axes and the speed of rotation which is found in all agricultural machinery, generators and heavy equipment, of course
فى هذا المنشور نتحدث عن البلية الموجودة فى كل محور وكل جزء دوار لتحافظ على نعومة التدوير وعدم تلف المحاور الدوارة وسرعة التدوير وهى موجودة فى كل الآلات الزراعية والمولدات والمعدات الثقيلة بالطبع
The load that a bearing is capable of carrying will depend on the size of bearing, how many rolling elements are used within the bearing and the design of
the bearing race. 
Types of Load
Radial Loads
A radial load is a force that is perpendicular to the rotational axis of a shaft.
Thrust Loads
A thrust load is the term used to describe a force acting  parallel to the rotational axis of a shaft
أنواع البلى حسب الأحمال
1- حمل إشعاعى أو عمودى أى حمل عمودى على محور الدوران كما يظهر فى الصورة
2- الحمل الموجه أو الأفقى وفيه تكون القوة المؤثرة فى إتجاه محور الدوران كما فى الصورة


Plain Bearings Bushings
Plain Bearings (Bushings)
Advantages
Low Cost
Quiet
Strength
Easy to install
Minimal space required
Disadvantages
High Friction

Require high level of lubrication.
المحمل أو الجزء الداخلى من البلية الملامس للمحور أو عمود الدروان مميزاته تكلفة منخفضة وبلا ضوضاء وقوى الخامة وسهل التركيب والعيوب يحتاج للتشحيم باستمرار بسبب الإحتكاك
The two most common plain bearings (bushes) used on our powertrain components are shown.  The top picture shows an example of a solid bearing / sleeve and the bottom picture shows an example of a thrust washer.
Solid Bearings are typically made from bronze, copper, brass and  are designed to support a radial load only whilst  thrust washers can only support thrust loads.

Take note of lubrication galleries as indicated
Basic Bearing Components (Ball Bearing)
Basic Ball Bearing Components
1/ Outer Race
2/ Ball
3/ Seperator / Cage
4/ Ball Path / Inner & Outer ring ball race
5/ Inner Race
6/ Bearing Face


Ball Bearings
Advantages

Shaft support under radial and  thrust 
loads.
Self aligning versions available.
Disadvantages

Cannot withstand heavy thrust loads
outer races cannot be removed without 
the ball bearings falling out.