Rolling Contact Bearing Numerical 8 - Rolling Contact Bearing - Machine Design - 2

TL;DR

A comprehensive analysis of bearing selection based on given conditions and work cycles.

Transcript

hello student let's see another category of numericals we're in the bearing life is given and you need to select the suitable bearing the problem statement goes like this a ball bearing mounted on 90 mm diameter of shaft operates on the following work cycle select suitable bearing for a life of 10,000 hours with 93 percent probability of survival t... Read More

Key Insights

• 🧑‍🏭 Bearing selection involves considering factors such as axial and radial loads, work cycle duration, temperature, and probability of survival.
• #️⃣ Calculations for equivalent load, number of revolutions, and dynamic capacity help in selecting a suitable bearing.
• 📔 The PSG data book provides options for different bearing sizes and dynamic capacities.
• 🛟 The selected bearing is justified if its life is greater than the required life.

Questions & Answers

Q: What factors are considered when selecting a suitable bearing?

Factors such as axial and radial loads, work cycle duration, temperature, service factor, and probability of survival are taken into account when selecting a bearing.

Q: How is the equivalent load calculated?

The equivalent load is calculated using the formula P = X * V * FR + Y * FA * SF * KT, where X, Y, V, FR, FA, SF, and KT are given parameters.

Q: How is the life of the bearing calculated?

The life in million revolutions for different probabilities of survival is calculated using the formula L = 60 * n * life in hours / 10^6, where n is the number of revolutions.

Q: How is the dynamic capacity of the bearing determined?

The dynamic capacity of the bearing is determined using the formula L90 = C / Pe^k, where L90 is the life in million revolutions for 90% survival, C is the dynamic capacity, Pe is the equivalent load, and k is a constant.

Summary & Key Takeaways

• The problem involves selecting a suitable bearing for a shaft with a given work cycle, bearing life requirement, and probability of survival.

• Three different conditions are given, each with different axial and radial loads and time durations.

• By calculating equivalent load, number of revolutions, and dynamic capacity, a suitable bearing can be selected.