This type of bushing is widely applied in hoisting machines and other construction machines, automobiles, tractors, trucks, machines tools and

some mineral engines. It can be fabricated into bushes, half bearings, flanged bushes, thrust washers, spherical bearing and so on.

The bearings are wrapped from a cold formed homogenous bronze (CuSn8) with exceptional material properties. The standard sizes are fitted with diamond shaped lubrication indents in the bearing surface. These indents serve as lubricant reservoirs to rapidly build up a lubrication film at the start of movement and thereafter reduce the running friction. The material is suitable for

construction and agricultural machinery applications.

Materials

Wrapped bronze bearings are made entirely from phosphor bronze CuSn8. CuSn8 is characterized by the purity of the alloy with only a very low level of impurities. Wrapped bronze bearings are produced from strips that are subsequently wrapped and calibrated.

Bronze Alloy	Chemical Element (%)	Type
CuSn8	Cu=91.3% Sn=8.5% P=0.2% Pb=0% Zn=0%	Lead Fedd
CuSn10Pb10	Cu=Balance. Sn= 9~11%, Pb=9~11%	With Lead

Lubrication

Wrapped bronze bearings must be lubricated with grease or oil on installation. A good quality lubricant is essential as it will reduce friction and wear by forming a film between the plain bearing and the shaft. For heavily contaminated applications, we recommend sealing off the bearing. This will protect both the bearing and the lubricant.

Long service intervals under severe operating circumstances.

Wrapped bronze bearings are ideal for applications where there are high levels of contamination. Their running surface is provided with diamond-shaped lubrication pockets or a hole pattern. The lubrication pockets must be filled with grease when the bearing is installed. The wrapped bronze bearings are produced according to the ISO 3547.

Features

1. Easy of fitting and lubricate
2. High load capacity
3. Excellent wear resistance with lower friction
4. High level thermal conductivity
5. Minimum overall dimensions
6. Chemical resistance
7. Extended service life and lubrication intervals than normal SB-090 type bearings
8. Free selection of lubricants
9. Collection of dust and rub off particles in the holes. Initial pre-lubrication at assembly is required…

Main Factors that Influence the Service life of the Bushing

1).PV Value
PV value is an effective criterion to calculate the service life of TCB900/TCB902. If there is need to prolong the service Life, PV value must be reduced.
2).Environment Temperature
Service life of the TCB900/TCB902 will shorten in higer ambient temperature .
3).Roughness
Service life of TCB900/TCB902 can be greatly improved if its mating axis is made of chrome-plated stainless steel with hardness more than 50HRC and surface roughness among 0.4~0.63.

Applications

Wrapped bronze bearings are especially suited to severe operating conditions where frequent maintenance is not possible. Common applications are:

• Agricultural vehicles
• Lifting gear
• Offshore
• Excavators

Advantages

The main advantages of wrapped bronze bearings include:

• Long service intervals
• Not affected by impurities
• Suitable for corrosive environments
• Suitable for impact loads and vibrations at low speeds
• Good heat dissipation

Available

Cylindrical Bushes
Thrust Washers
Non-standard parts as design

Physical and Mechanical Performance

Performance Index		Data
Max Dynamic Load		100N/mm2
Max Linear Velocity（Grease）		2m/s
Max PV value（Grease）		2.8m/s
Tensile Strength
Yield Strength
Hardness
Mating Axis	Hardness	≥50HRC
	Roughness	0.4~1.0HRC
Working Temperature		-40~+150℃
Friction Coefficient		0.06~0.15μ
Heat Conducting Coefficient		58W/(m·k)
Heat Expansion Coefficient		18.5×10-6/K