Needle roller bearing

Needle roller bearing

Needle roller bearings are a bearing that is classified as either radial or thrust depending on the direction of the load being supported. They are used to reduce friction of a rotating surface.

Needle roller bearings are separable radial bearings with very low sectional heights that feature high load carrying capability. Needle roller bearings use long, slim rollers, the so -called "bearing needles" as rolling elements. Due to the possibility of mounting inner and outer rings of needle roller bearings separately, mounting becomes much simpler, even under the conditions of mass production. The comparatively thin - walled needle roller bearing rings are usually mounted with tight fits.

Needle bearings have a large surface area that is in contact with the bearing outer surfaces compared to ball bearings. Additionally there is less added clearance so they are much more compact.

Needle roller bearings include bearings whose rollers slightly exceed the size range of needle rollers as stipulated by ISO. Needle roller bearings include drawn cup and solid radial bearings, as well as application-specific cam followers, and roller followers. Thrust bearings include thrust needle bearings.

Needle bearings feature a smaller cross-section, higher load-carrying capacity, greater rigidity, and lower inertia forces that facilitate size and weight reductions in machinery. They’re designed to withstand oscillation, perform under severe conditions, and interchange with sliding bearings.

Needle roller and cage assemblies are offered in single or double row, solid or split cage, metric and inch sizes; as well as in connecting rod bearings for special applications.

Single and double row bearings are available with or without ribs, and with or without inner rings.

Thrust bearings are offered in single row roller and cage assemblies.

Needle roller bearings can be found in the following applications:

1 Gear pumps

2 Mud pumps

3 Oil field pumping jacks

4 Helicopter rotors and transmissions

5 Telehandlers

6 Material handling equipment

7 Hydraulic pumps

8 Sheave Blocks

9 Hoist drum shaft

10 Marine crankshafts and connecting rods

11 Pipe handling tables in steel mill equipment

12 Paper punch presses

13 Planet gears and mainshaft bearings of a clutch drive or mechanical press

14 Calendar rolls in textile machinery

15 Railroad tampering equipment

Needle roller bearings Features and Benefits:

• Range includes solid, drawn cup or cage and roller options
• High quality steel - ultra clean steel to extend bearing life by up to 80%

Drawn-Cup Needle Roller Bearings 

Used in automotive applications such as camshaft journals, compressors, and powertrain.

Thrust Needle Roller Bearings 

what is Ball Bearing ?

Ball Bearing 

Bearing

Bearings can vary in size from as small as a pin head to the size of a family car! They can have varying sizes and shapes of rolling elements made from Steel, Stainless Steel and Ceramics. Their primary function is to reduce friction, carry loads and guide moving parts. Basically anything in our lives that has a rotating shaft will have a bearing of one kind or another. The different bearing types often dictate their uses and applications. Here, we mainly talk about Ball Bearing.

What is ball bearing?

A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races.

The History of Ball Bearing

More than 4500 years ago, Egyptians used cylindrical rollers to move the large heavy blocks of stone needed for the pyramids, foreshadowing the use of ball bearings. Similar techniques were used in the creation of Stonehenge years later. In 1794, ball bearings supporting a carriage axle appeared in a patent filed by Philip Vaughan. In 1869, a bicycle mechanic in Paris, Jules-Pierre Suriray, patented a steel ball-bearing design for bicycles.

The Uses of Ball Bearing

Ball bearings are used in many types of equipment and machines to reduce friction, to reduce component part wear and tear, and to eliminate the need for frequent component part replacement. The concept for ball bearings is elegant yet simple: Substituting a rolling component (ball) for a sliding component reduces the generation of friction.

The basic parts of a ball bearing include:

1) Inner Race

This is the part that is mounted on the rotating shaft and tends to rotate the shaft.

2) Outer Race

This is the part that is mounted to the housing and is stationary. This also serves as a means for transferring the loads from the bearing to the housing.

3) Rolling Element “Balls”

These are the elements that carry the load distributing it throughout the raceways. They tend to rotate about the inner race, but not at the speed the inner race rotates. It is something like the relation between the earth and the moon.

4) Cage

This is an important element in the bearing. This acts as a barrier between the balls preventing them from bumping into each other.

The Advantage of Ball Bearing

1)      Power Saving

2)      Lubrication and Labor Saving

3)      Reliability

4)      Cleanliness

5)      Reduced Fire Hazards

6)      Increased Production

7)      Increased Life of Assiciated Equipment