The BBT bearing is primarily intended for oscillatory motions and bearing installations where frequent stop-start occurs.
The BBT and BBT-F cylindrical bearing, is a three-layer bearing consisting of a bronze mantle and a sintered bronze middle layer that is impregnated and coated with a PTFE layer. The BBT bearing is primarily intended for oscillatory motions and bearing installations where frequent stop-start occurs.
The friction coefficient is very low; therefore the BBT bearing can be used without lubrication. The BBT bearing has good chemical resistance to most common substances. The thin layer that constitutes the bearing’s surface, should be well protected to avoid damage during assembly and from heat e.g. from welding.
Technical data
| Material: | |
| SBT: | Steel backing, bronze, PTFE-layer |
| RBT: | Stainless steel backing, bronze, PTFE-layer |
| BBT: | Bronze backing, bronze, PTFE-layer |
| Friction: | 0,03–0,20µ |
| Max speed: | Osmort 2,5m/s, Smort >2,5m/s |
| Temperature range: | -200 / +280 °C |
| Load | Movement |
| Ca: 250 N/mm2 | Static |
| 140 N/mm2 | Dynamic |
| 60 N/mm2 | Rotating, oscillating |
Lubrication
The BBT bearing is primarily intended to be used without lubrication. If initial lubrication does take place then additional lubrication is also recommended. Additional lubrication can be also recommended to prevent corrosion of the shaft material. Greases with additives of graphite or molybdenum disulphide should be avoided.
Tolerance
Seat H7, recommended shaft tolerance f7 for shafts up to 75 mm. Over 75 mm we recommend h8.
Special Designs
- Only larger series.
- With stainless steel mantle
- Plane bearings and thrust washers
- Other tolerance positions
- Drawing details
Examples of typical uses:
- Lifting Tables
- Person Lifts
- Hydraulic Pumps
- Pneumatic Cylinders
- Textile Machinery
Advantages
- The bronze mantle reduces the breakdown risk
- The bronze mantle increases the corrosion resistance.
- Designed to function even without lubrication
- Broad temperature range
- Low friction coefficient
- High chemical resistance to the most common substances
- A broad range of dimensions is stocked
- Many areas of application
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