bearings
-
Tapered roller bearings explained
1. Overview Tapered roller bearings (TRBs) can handle both radial and axial loads due to their conical geometry. 2. Design and Geometry Geometric Relationship: where: 3. Load Handling Capacity The relationship between the radial and axial loads for a single tapered roller bearing is: where is the contact angle. For a bearing pair, the axial load capacity is…
-
Hertzian contact explained
Hertzian contact stresses describe the localised stress distribution that occurs when two curved surfaces (e.g., spheres, cylinders, gears) are pressed against each other. This theory, developed by Heinrich Hertz in the late 19th century, is used to predict the behaviour of materials under compressive loads where contact is made over a small area, like in…
-
Beyond L10
In addition to loading level, several other factors are considered when assessing bearing life. These factors are critical for accurate prediction and optimisation of bearing performance in various applications. Here’s a detailed look at these factors: 1. Bearing Material and Quality 2. Bearing Type and Design 3. Operating Speed 4. Mounting and Alignment 5. Environmental Factors 6. Lubricant Condition and Replenishment…
-
Bearing L10 life
Understanding Bearing L10 Life The L10 life (or L₁₀ life) is a key reliability measure used to estimate the lifespan of rolling element bearings, such as ball bearings and roller bearings. It represents the number of revolutions or operating hours at which 90% of a group of identical bearings are expected to remain operational without showing signs of…
-
What is thick-film lubrication?
Thick-film lubrication, also known as hydrodynamic or full-film lubrication, can be described using several equations that model the conditions and parameters involved. Below are the key aspects along with the relevant indicative equations: These equations provide a theoretical basis for understanding and analysing thick-film lubrication, helping to predict and optimise the performance of mechanical systems…
-
What is hydrodynamic theory?
Hydrodynamic theory is a branch of fluid dynamics that deals with the study of fluids in motion. It encompasses the behaviour of liquids and gases (fluids) and is concerned with the forces and motions that arise in fluids due to their properties and interactions. Let’s break down the theory from the simplest concepts to more…
-
What is Petroff’s law?
Petroff’s Law is a principle used in fluid dynamics, particularly in the context of lubrication and tribology, to describe the relationship between the load carried by a thin film of lubricant and the viscosity, speed, and thickness of the film. It’s named after Russian scientist Nikolai Petroff, who developed the theory in the late 19th…