Difference Between Bearing and Bushing

Every machine has moving elements that move relative to one another in a sliding or rolling action. Linear sliding motion, such as in machine tools, and rotation motion, such as in motor vehicle wheels, are examples of relative motion. Bearings are precision-machined components that allow machines to operate at extremely high speeds while decreasing friction and handling stress between moving elements.  

Bearing vs Bushing 

The main difference between bearing and bushing is that bushing is a sort of bearing. Bushings are distinct pieces of equipment, but bearings are a generic phrase for whatever that facilitates motion between two components. Unlike rolling-element bearings, bushings are made out of a single piece. Following are other differences between both of them.

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Around the turn of the nineteenth century, the bearing was redesigned in its current shape. Initially, it was made by hand. Bearings are one of the most widely used machine parts nowadays because their rolling motion simplifies and lowers friction in almost all activities. Thus, they are getting used in limitless numbers of machines. 

A bushing is a specific type of bearing. Although the design is simple, the material utilized has a significant impact on the bushing’s performance and function. A bushing, on the other hand, is a self-contained plain bearing that supports a shaft and moves back and forth between the moving surfaces.  Bushings made of plastic.

 Comparison Table Between Bearing and Bushing 

Parameters of Comparison Bearing Bushing 
 Fundamental Bearing is a component of a machine that moves at an extreme pace. It is the independent part that is plain and used to support the shaft. 
Function Bearing is also used for the purpose to reduce friction. The bushing is required because it operates the motion of two already moving interfaces. 
 Composition  The bearing consists of two parts that make it whole. The bushing is a single-piece element. 
Category Bearing does not belong to the bushing category. Bushing certainly belongs to the bearing category. 
Application Bearing is used in many types of vehicles  The bushing is used in the suspension machines of the vehicle. 

What is Bearing? 

The bearing was created in its current form around the end of the nineteenth century. It was produced by hand at first. Bearings are one of the most extensively utilized machine parts nowadays since their rolling motion simplifies practically all actions and reduces friction. 

Bearings have two primary purposes: 

They transmit motion by supporting and guiding components that rotate in relation to one another. 

They are responsible for transmitting forces. 

Sleeve bearings and rolling bearings 

The axle and the bearing travel in opposite directions on a sliding surface in a sleeve or plain bearing. The inner and outer rings of a rolling bearing, on the other hand, move towards one another and are separated by rolling elements. Compared to a sleeve bearing, this design produces substantially less friction. Axial bearings and radial bearings are two types of bearings. Bearings may transport loads in both radial and axial directions (push), and in many circumstances, both radial and axial loads must be transmitted. 

Ball bearings and roller bearings are available in both configurations. The type of bearing to use is determined by the application. 

What is Bushing? 

A bushing is a particular kind of bearing. Although the design is basic, the performance and function of a bushing are highly dependent on the material used. Bushings made of bronze 

Bronze bushings have a long service life and are extremely durable. They don’t rust and don’t distort readily. Bronze bushings, on the other hand, require a lot of oil during operation, making them more difficult to maintain than plastic bushings. 

Bushings made of plastic: Plastic bushings are popular because they are inexpensive, have little friction, and need little maintenance. They are self-lubricating, making them ideal for hard-to-reach sections, and they are corrosion-free, allowing them to be utilized in moist settings. 

We examine the advantages and disadvantages of using plastic as a bearing material. 

 Plastic bushings offer several operational benefits. They are maintenance-free and have a low coefficient of friction since they are self-lubricating. Plastic is ideal for basic plain bearings since it minimizes weight and maintenance while also preventing brinelling. However, we’re witnessing a rise in the use of plastic ball bearings and bushings. Bushings are self-contained plain bearings made up of multiple distinct materials that are integrated to form a single load-bearing component. 

Main Differences Between Bearing and Bushing 

  1. The contrast between bearings and bushings is a kind of bearing. Bearings are a generic term for anything that allows motion between two components. Bushings are specific pieces of equipment. Bushings are composed of a single component, unlike rolling-element bearings. 
  2. Bearing is also used for the purpose to reduce friction whereas Bushing is required because it operates the motion of two already moving interfaces. 
  3. The bearing consists of two parts which make it whole whereas Bushing is a single-piece element that is an independent element to work. Bushings are self-contained plain bearings made up of multiple distinct materials that are integrated to form a single load-bearing component. 
  4. Bearing does not belong to the bushing category. It is an important part of a machine on its own whereas Bushing certainly belongs to the bearing category. It is one of the types of bearing 
  5. Bearing is used in many types of vehicles whereas Bushing is used in the suspension machines of the vehicle and many other machines where it plays different roles. 

Conclusion 

While a bushing is theoretically similar to a bearing, the difference is that a bushing is a single independent one-part device, whereas a bearing is often made up of two or more components. 

While bushings are similar to bearings in that they are used to support a shaft and work with sliding motion between the moving surfaces, bearings are not always bushings. 

Bearings are specifically engineered to increase bearing life in machines, minimize friction energy losses, and wear, and hence save maintenance costs. The majority of bearings in machines are employed to support spinning shafts. Bearings are self-lubricating, whereas bushings are generally brass or bronze. 

References

  1. https://www.sciencedirect.com/science/article/abs/pii/S0079642511000922
  2. https://www.osti.gov/etdeweb/biblio/21406873
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