1. The sealing performance of bearings includes four aspects:

Friction torque

Leakage rate of fat

Temperature performance

Dust,

2. Fat leakage rate:

Contact type ≤ 5%,

Non-contact ≤10%;

Test speed: 0.3 times the limit speed of contact sealing bearing

Ambient temperature: 20±10 ºC

Trial time: 6 hours

3. Temperature rise performance of bearing:

Contact ≤ 55 ºC,

Non-contact ≤45 ºC;

Test speed: 0.75 times the limit speed of contact sealing bearing

Ambient temperature: 20±10 ºC

Trial time: 6 hours

4. Dustproof performance of bearing:

Contact type ≤ 80000 /cm³,

Non-contact ≤16000 /cm³;

Test speed: 0.3 times the limit speed of contact sealing bearing

Ambient temperature: 20±10 ºC

Trial time: 6 hours.

Dust medium box: ash filling volume 0.4~0.6%V (V ash box volume)

Speed of 50 r/min

Evaluation standard for dustproof performance of bearings

Level 1 dustproof: the fat sample is primary color and is completely transparent. There is no dust medium particles under microscope

Second dustproof: the fat sample is primary color and is completely transparent. There are dust medium particles under microscope

Grade 3 dustproof: most of the fat samples are primary color, and a small part of them begin to change color and become translucent

Grade 4 dustproof: most of the fat samples are discolored, and a small part is primary color and is gray

Grade 5 dustproof: all lipid discoloration, black, opaque

Grade 6 dustproof: all lipid discoloration, black, opaque, and bearing clearance significantly increased

2. How to choose grease

1, lubrication role:

A thin layer of oil film is formed to separate the rolling body from the rolling surface to reduce friction and wear.

Make the rolling contact surface of the bearing form an appropriate oil film, prolong the bearing life;

Discharge friction and heat from the outside, prevent bearing overheating, delay the aging of anti-rust oil itself;

Prevent foreign matter from invading into bearing interior, rust and corrosion prevention;

2. Lubricating grease:

Base oil

Mineral oil, semi-synthetic oil PAO, synthetic oil (difat oil, silicone oil, polyethylene difat oil, polyethylene ether oil, fluorocarbon oil, fluorosilicone oil, perfluoropolyether)

thickener

Metal soap base: lithium soap base, good water resistance, good mechanical stability; Calcium soap base, good water resistance, poor heat resistance; Sodium soap base, poor water resistance, good heat resistance.

② Non-metallic soap base: silica gel, benton and other inorganic substances; Urea, fluorocarbon, ptfe compounds; Nonmetallic soap base has good heat resistance.

additive

Extreme pressure additive: withstand heavy load, impact load;

② Antioxidants: prolong service life.

other

① structural stabilizer ② antirust ③ preservative.

3. Lubricating oil:

General use: mineral oil without additives;

(2) special occasions: add extreme pressure resistance, anti-aging additives;

The selection of synthetic oil: temperature, speed is very high or very low occasions.

It has been proved that the bearing system is the key control element, how to determine the coordination of parts, what kind of grease to choose, how to ensure the benign cycle of grease in the process of bearing operation, how to ensure the metabolism of grease in the process of bearing operation are the key points that can not be ignored.

e-mail：bearing6@hyzcgroup.com