Bronze Wrapped Bearings

JBM-09G

Bronze Wrapped Bearings with Graphite

PRODUCT OVERVIEW

Features & Benefits

The JBM-09G is an advanced bronze wrapped bearing that enhances the standard CuSn8 bronze construction by embedding solid graphite lubricants into the bearing surface. This design significantly lowers the coefficient of friction, particularly during initial movement, and allows for effective operation under dry or marginal lubrication regimes for short periods. It retains the high load-carrying capacity, excellent thermal conductivity, and chemical resistance of the bronze backing while offering superior protection against wear in demanding environments.

MATERIAL COMPOSITION

Structure

Layer	Material	Thickness	Function
	Homogenous Bronze (CuSn8) with Solid Lubricants	Wrapped cold formed	Based on the JBM-090 structure, this material features solid lubricants (graphite) embedded into the diamond-shaped surface indents. These integrated lubricants provide a critical sliding layer during the start-up phase, ensuring smooth operation even in conditions with oil starvation or marginal lubrication.

SPECIFICATIONS

Technical Data

chemical composition

Cu 91.3%
Sn 8.5%
P 0.2%
Pb N/A
Zn N/A

max load

static 120 N/mm²
dynamic 40 N/mm²

max speed lubricated

2.5 m/s

max pv

2.8 N/mm²*m/s

tensile strength

450 N/mm²

hardness

HB > 110

elongation

40%

temperature limit

-100℃ ~ +200℃

friction coefficient

0.05~0.25

thermal conductivity

58 W(m*K)⁻¹

coefficient of thermal expansion

18.5*10⁻⁶*K⁻¹

WHERE IT'S USED

Typical Applications

Construction & Heavy Equipment

The JBM-09G is widely utilized in hoisting machines, construction equipment, and agricultural machinery where start-up loads are high and continuous oil film maintenance is challenging.

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Agricultural Machinery

Key applications include automotive clutch parts, gearboxes, tractors, trucks, and mineral engines. Its ability to function with minimal lubrication makes it an excellent choice for assemblies where maintenance access is limited.