2024/06/16

Bearing Sleeve Types: Uses, Materials and Selection Guide

Table of content

1. Introduction about sleeve bearing

2. Bearing sleeve types - DU PTFE composite bushing (Oilless bearing)

3. Bearing sleeve types - DX POM composite bushing

4. Bearing sleeve types - Bimetal bushing

5. Bearing sleeve types - Bronze Wrapped Bearing

6. Bearing sleeve types - Solid lubricant inlaid bearings

1. Introduction about sleeve bearing

When choosing bearing sleeve types, you should consider whether you need an opening, how big it should be, and how tall you are, rather than clearance and tolerance. Generally, you need an opening (there is no standard for openings you can ask for a free torch).

Compared with other bearing sleeve types , it does not need oil at all, it relies on lubrication to rotate smoothly.

2. Bearing sleeve types - DU PTFE composite bushing (Oilless bearing)

Oilless Slide Bushing is made of the PTFE composite material, which is a copper-plated steel plate on which a porous layer of tin bronze powder is sintered and a mixture of PTFE and lead is filled into and covered by a porous layer by a rolling process.

PTFE with lipophilicity fiber forms a transfer film when operating, which can protect the shaft.
The low friction coefficient and good anti-wear properties make the working life longer.
Fits well in the motion of rotation, sway, and reciprocating.
Dry or with less grease, maintenance-free.

3. Bearing sleeve types - DX POM composite bushing

It is a boundary lubricating bushes made of the POM composite material, which also has a copper-plated steel plate on which a tin bronze powder is sintered, and modified polyformaldehyde resin (POM) is firmly anchored in the sintered bronze layer. The surface of the covering layer has many pockets to retain lubricating grease.

Good load and anti-wear capacity.
Suitable for rotation, swing, or frequent start and stop movements under high load and low-speed conditions.
In the case of boundary lubrication, it can work without oil for a long time, and refueling or grease during work can prolong the working time.

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4. Bearing sleeve types - Bimetal bushing

Based on high-quality low carbon steel sintering bronze alloy or lead-free bronze alloy on the surface, provide a high specific load, especially fits for high speed and shock conditions.

Oil pockets or grooves can be machined in the liner for better grease storage. Widely used in truck chassis, agricultural machinery, construction machinery, etc. In addition, lead-free meet EU requirements and are the best choice for the automotive field.

High fatigue strength, load capacity, and impact strength.
Good corrosion resistance
Relatively good surface performance

5. Bearing sleeve types - Bronze Wrapped Bearing

The bearing sleeve types is wrapped in a cold form of able homogenous bronze, which will obtain exceptional material properties. Standard bearings are equipped with diamond-shaped lubrication grooves on the bearing surface. These indentations act as lubricant reservoirs and rapidly form a lubricating film during the start-up motion, reducing start-up friction. Typical applications are widely used in construction machinery such as hoisting machinery, automobiles, tractors, trucks, machine tools, and some mining engines.

High density & load capacity.
Good property of anti-wear, long working time.
In place of traditional casting bronze bush.
Cheaper and more compact.

6. Bearing sleeve types - Solid lubricant inlaid bearings

This type of bearings material provides a maintenance-free and low-friction bearing especially suitable for high loads and intermittent oscillating motion. Solid lubricants in bronze combine the strength of bronze with the wear resistance of graphite. Applications are used in automotive production lines, water industry, dam gates, plastic molding machinery, etc.

Well-designed and widely used.
Superior chemical resistance and corrosion resistance.
The superior functions can be brought into play on the occasion when oil film cannot be formed for frequent start-ups, like high load, low rotating speed, cycle movement, reciprocating motion, swing motion, and so on.
Oil-free use.
Low cost of use and high competitiveness

Comparison: DU PTFE Composite Bushing vs. DX POM Composite Bushing

	DU PTFE	DX POM
1	PTFE and lead	POM
2	Tin Bronze Powder	Tin Bronze Powder
3	Copper Layer	Copper Layer
4	Steel Backing	Steel Backing
5	Copper Layer	Copper Layer

	Compressive strength (Mpa)	Temperature range (℃)	Coefficient of friction	Width of wear (mm)	PV factor limit (Mpa. m/s)	Wear depth limit (mm)	Thermal conductivity Kcal/M.br.C	Coefficient of linear expansion(per C)
DU PTFE	280	-195~+270	<0.20	<0.55	3.6	0.05	2.41	27*10^5
DX POM	140	-20~+100	<0.20 (grease)	<4.5 (grease)	10 (grease)	0.50	2.03	5.1*10^-5

If you're unsure about which bearing to choose, it's advisable to consult with a professional engineer or bearing supplier to ensure your equipment achieves optimal performance and longevity.

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What is a Sleeve Bearing?

A sleeve bearing (also known as a bushing bearing or plain bearing) is a straightforward and fundamental type of bearing. It primarily consists of an inner metal sleeve (known as the bushing) and an outer metal sleeve. Between these two sleeves lies a layer of special lubricating material, typically a sliding surface coated with grease or oil.

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