Bearings are the “joints” of mechanical systems, critical for supporting rotating shafts and reducing friction. This article covers model parameters, applications, key knowledge, FAQs, and installation standards to help you master bearing essentials efficiently.
Weekly Model: Deep Groove Ball Bearing 6204
Parameter Breakdown
Complying with GB/T 272-2017, bearing 6204 features:
- Type code “6”: Deep groove ball bearing, the most versatile option;
- Dimension series “02”: Light series balancing load capacity and weight;
- Bore code “04”: Inner diameter = 20mm;
- Key specs: Outer diameter 47mm, width 14mm, basic dynamic load rating 12.8kN, limit speeds 12000r/min (grease lubrication) / 15000r/min (oil lubrication).
Core Applications
Ideal for light-load, high-speed, low-noise scenarios:
- Home appliances: Washing machine drums, air conditioner compressors, electric fans;
- General machinery: Small motors, centrifugal pumps, blowers;
- Automotive components: Engine accessories, transmission auxiliary mechanisms.
Bearing Tip: Rolling Friction Principle
Bearings comprise inner ring, outer ring, rolling elements, and cage. They transform sliding friction into rolling friction, cutting the friction coefficient from 0.1–0.3 to 0.001–0.005, significantly boosting mechanical efficiency.
FAQ
Q1: What does suffix “C3” indicate?
A: C3 denotes larger radial clearance than standard (CN). It prevents seizing in high-temperature environments where shaft and bearing expand differently, commonly used in motors and reducers.
Q2: Why avoid direct hammering during installation?
A: Hammering causes raceway damage, rolling element wear, and cage distortion, shortening service life. Use a copper sleeve and hydraulic press to apply uniform pressure to the inner/outer ring based on fit type.
Q3: How to ensure proper lubrication?
A: Fill grease to 1/3–1/2 of the bearing cavity. Overfilling leads to overheating; underfilling causes dry friction. Select low-viscosity lithium grease for high speed, high-viscosity composite lithium grease for low-speed heavy loads, and polyurea grease for high temperatures.
Summary
Mastering bearing model interpretation, selection logic, and installation standards ensures equipment stability. The universal 6204 suits most light-load, high-speed applications. Pair proper installation and lubrication with tailored selection for high reliability and long service life.