OILLESS BEARING

WHAT IS AN OILLESS BEARING?

A bearing that can improve productivity and save cost/time by having the material properties which can withstand both high & low temperature, corrosive environment, foreign particles, and impact load. There are various kinds of shapes and materials for oil less bearings such as metal, plastic and ceramic.

■ STRUCTURE
Sintered layer including solid lubricant and oil impregnated pores & Backing steel.■ FEATURES

Uniformly spread solid lubricant is available to be used for any motion.
Highly operational even to fine and minute movement.
Available to use without lubrication.
Excellent for high load and speed with good abrasion-resistance.
Standard product can be purchased immediately, and material for additional processing is also available.
Stock materials may be processed and then must be impregnated in the lubricant before use.
If it is used for the first time or has not been used for a long time, lubrication is necessary before using.

■ WEAR AMOUNT TEST
1. Contact pressure: 250kgf/cm2
2. Velocity: 9m/min
3. Test Time: 250h
4. Mating Material: JIS S45C + HRC 50

Advantage & Disadvantage of Oilless Bearing

Dry lubrication (using solid lubricant)

Liquid lubrication (using oil or water)

Advantage

o Available to being used in high & low temperature

o Available to being used in corrosive environment

o High load and low speed condition where oiling is useless, liner
motion, angular pitching motion, imp active load and ideal in discontinuous
motion

o Light or medium load and high speed

o Liquid lubrication prevent friction between metal to metal by
forming oil film with continuously rotating by centrifugal force in the
clearance of shaft and housing

Disadvantage

o Not supposed to be used inhigh speed when it is using in soilless condition

o Using it in high speed condition may occur seizure or shorten life cycle of bearing because solid lubricant has higher friction coefficient
than liquid lubricant

o Regular oiling is required

o Cannot be used in high & low emperature

o Cannot be used in corrosive environment

o Not proper to be used in high & load speed as oil film is hard to be formed, imp active load, angular pitching motion, discontinuous motion

o Not proper to be used in high load & high speed (shorten life cycle of bearing because of heavy PV value)

Base metal and its use

CODE	SP	HP	BP	AL	B	F	SUS	S
BASE METAL	High strength Brass casting	Special high strength Brass casting	Brass casting	Aluminum Bronze casting	Bronze casting	Cast Iron	Stainless Steel	Steel
USE	General	Higher load and pressure than SP	General	General	General	High temperature	Chemical resistance	High pressure
	High pressure		Low load	seawater	High speed		High temperature	Shock resistance
	underwater		underwater

Solid Lubricant type

USE	CODE	USE	CODE
High pressure, sea water	SL5	High temperature	SL1
Underwater, Eco-friendly	SL7	General	SL2
		Underwater	SL4

DEVELON BEARING
Develon is steel-backed sintered metal bearing with excellent wear-resistance for heavy load and low/mid velocity under harsh environment of shock and vibration.

■ MECHANICAL AND PHYSICAL PROPERTIES