Bearing Selection Guide

Bearing Selection Guide: Model Selection Manual, Basis, and Standard Analysis

In mechanical design and maintenance, bearing selection is the core element for ensuring the efficient operation of equipment. This article analyzes the key points of bearing selection from the perspectives of model selection basis, steps, methods, and standards, combining industry practice and theory, to help engineers precisely identify their needs.

I. Bearing Model Selection Basis

1. Load Type and Size

Radial Load: Prefer deep groove ball bearings (light load) or cylindrical roller bearings (heavy load).

Axial Load: Thrust ball bearings (small load) or thrust roller bearings (large load).

Combined Load: Angular contact ball bearings or tapered roller bearings, select contact angle based on A/R (axial load to radial load ratio).

2. Speed Conditions

High-speed scenarios (e.g., motor spindles) select ball bearings (high limit speed) or light series bearings (lightened rolling elements).

Ultra-high speed requires special lubrication (e.g., oil mist lubrication) or high tolerance level bearings.

3. Environment and Operating Conditions

High temperature/corrosive environment: Use stainless steel or ceramic bearings, and configure high-temperature seals.

Polluted environment: Fully sealed bearings (e.g., 2RS rubber seals) to prevent foreign object intrusion.

4. Installation Space and Maintenance Needs

When space is limited, select ultra-light series or miniature bearings, and consider separable designs (e.g., N-series cylindrical roller bearings) to simplify installation.

II. Basic Steps of Bearing Model Selection

1. Clarify Operating Conditions

Determine load type (radial/axial/combined), speed range, temperature, vibration, etc.

2. Preliminary Bearing Type Selection

Select ball bearings (light load, high speed) or roller bearings (heavy load, low speed) based on load and speed.

3. Calculate Equivalent Dynamic Load and Life

Calculate equivalent dynamic load using the formula, and verify selection with the basic rated life.

4. Determine Dimensions and Accuracy

Select inner diameter (d), outer diameter (D), and width (B) based on shaft diameter and bearing seat dimensions, and use P5/P4 tolerance levels for high precision scenarios (e.g., machine tools).

5. Clearance and Lubrication Design

For high temperature or high-speed applications, increase clearance (e.g., C3 group); grease lubrication is suitable for medium and low speeds, while oil lubrication is for high speeds or high temperatures.

III. Bearing Model Selection Standards and Specifications

1. Code System

2. International and Industry Standards

IV. Bearing Series Selection Strategy

Bearing selection requires consideration of multiple factors such as load, speed, environment, and strict adherence to industry standards and calculation procedures. Through systematic selection steps and precise model matching, equipment reliability can be significantly improved and maintenance costs reduced.

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If you want to learn more about bearing system solutions, feel free to contact us. National Hotline: 4006-808-505, Bearing Technical Personnel in this Industry: Manager Li: 13657445999.