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BRT-10 Metal-Polymer Composite Bushing
Metal-polymer self-lubricating composite materials consist of metal backing sintered porous bronze with PTFE polymer as working layer. The metal backing provides mechanical strength, while the bronze sintered layer provides a strong mechanical bonding between the backing and the bearing lining, the PTFE polymer offers exceptional low friction even under dry condition and the thermoplastic polymer is generally designed to operate with marginal lubrication.
Product Description
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Metal-polymer self-lubricating composite materials consist of metal backing sintered porous bronze with PTFE polymer as working layer. The metal backing provides mechanical strength, while the bronze sintered layer provides a strong mechanical bonding between the backing and the bearing lining, the PTFE polymer offers exceptional low friction even under dry condition and the thermoplastic polymer is generally designed to operate with marginal lubrication. The construction promotes dimensional stability and improves the thermal conductivity. This material meets the demands for longevity, speed and temperature criteria with or without lubrication.
Applications
Agricultural machinery: tractors, combine harvesters, crop sprayers, bulldozers, graders, etc.
Automotive industry: power steering pump, steering gear thrust washers, disc brakes, shock absorbers, hinges, wiper, chair recliners, air valves and solenoid valves, etc.;
Business machines: duplicator, fax machine, automatic printing devices, mail processing machinery…
Hydraulics and valves: pumps including gear, rotary, water, axial piston, and other types, ball, butterfly, poppet steam, and other valves and valve trunnions…
Home appliances: tape recorders, refrigerators, air conditioners, cleaners, polishers, sewing machines, ovens, dishwashers, clothes washing machines…
And materials handling, marine engine, packaging, textile equipment, tools…etc.
Material Structure
Note: Various materials are suitable for BRT-10 Series products according to different working conditions, such as bronze backing (BRT-1B), stainless steel backing (BRT-1S) and lead-free material (BRT-1W).
Wear-resisting Performance
1. “Running-in” phrase: PTFE compound on the bushing is transferred to its mating surface and forms a lubricating film. At this phase, the friction coefficient is bigger, thus the abrasion pace is very quick. See the curve showed in area I of the graph.
2. “Stabilization” abrasion phrase: After the “Running-in phase”, the friction happens between PTFE and PTFE, thus the friction coefficient is smaller and keeps steady. As a result, the wear rate is low and steady. See the curve showed in areaⅡof the graph.
3. “Sharp” abrasion phrase: As PTFE in the porous layer is slowly consumed up, not enough lubricant can be supplied to the gliding media. Friction coefficient and wear rate will rapidly rise. When 70% of the bronze surface is exposed, service life of SRI01 closes to its end. See the curve showed in area Ⅲof the graph.。
Factor
1). PV Value
PV value is an effective criterion to calculate the service life of BRT-10. If there is need to prolong the service Life, PV value must be reduced.
2). Ambient Temperature
The higher the working temperature is, the shorter the life of the products would be.
3). Quality of the Mating Surface
The service life of SE-010 bearings can be significantly improved when alloy steel or hard chromium plated shafts are used as dual components, and the surface roughness is within the range of Ra=0.4~0.63.
Besides the standard products displayed in the list of this catalogue. We can also supply non-standard products or develop according to customer design.
BRT-10 Tech. Deta
| The use of parameters |  |
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|---|---|---|---|---|---|---|
| Parameters | BRT-10 Lead-Free Bushing |
BRT-1B Bronze-Based Bushing |
BRT-1D Hydraulic Bushing |
BRT-1W Gear Pump Bushing |
BRT-1P Reciprocating Motion Bushing |
BRT-1S Stainless Steel Bushing |
| Load capacity(Dynamic) N/mm² | 140 | 140 | 140 | 140 | 140 | 140 |
| Load capacity(Static) N/mm² | 250 | 250 | 250 | 250 | 250 | 250 |
| Oscillating N/mm² | 60 | 60 | 60 | 60 | 60 | 60 |
| Speed limit(Oil) m/s | 5 | 5 | 3 | 10 | 2.5 | 4.5 |
| Friction Coef. μ | 0.04-0.20 | 0.03~0.18 | 0.04-0.20 | 0.04-0.20 | 0.04-0.20 | 0.04-0.20 |
| PV limit(Dry) N/mm².m/s | 3.6 | 4.3 | 3.8 | 4.3 | 3.6 | 3.6 |
| PV limit(Oil) N/mm².m/s | 50 | 60 | 50 | 60 | 50 | 50 |
| Temp. Limit℃ | -295 ~ +280 | -195 ~ +300 | -195~ +280 | -195~ +280 | -195~ +280 | -295~ +270 |
| Thermal conductivity W/m·k | 13 | 18 | 16 | 13 | 13 | 16 |
| Linear expansion | 11×10-6/K | 21×10-6/K | 15×10-6/K | 11×10-6/K | 11×10-6/K | 15×10-6/K |
