MATERIAL : HIGH TENSILE MANGANESE BRONZE
COMPOSITION : Cu= 60 – 65%
Al= 3-7.5%
Fe= 2-5%
Mn= 2.5-5%
Zn = balance.
HARDNESS : 180-210 BHN
LOAD : 750 N/mm2
PV VALUE : 20 N/cm2
DETAILS : It has a backing made of high tensile manganese bronze with a
Special filling of prescription of solid lubricant inserted with certain angle &
Density into the surface and processed with precision finishing. It is mainly
Used for high load and moderate speed application.
BUSHES & PLATES CAN BE DEVELOPED WITH ANY SPECIFICATIONS AS PER CUSTOMERS REQUIREMENTS.
Applications of oilless bearings
- ✦ Where it is inaccessible or difficult to lubricate bearings.
- ✦ Where hours for design, assembly and maintenance need to be saved.
- ✦ Where it is difficult to lubricate bearings due to high / low temperature.
- ✦ Where minimum space is required for bearings.
- ✦ Where corrosion resistance or waterproofing is required.
- ✦ Where there is dust in the operating environment.
- ✦ Where oil contamination is not desired.
- ✦ Where high load and low speed operation that does not accept lubrication is required.
- ✦ Where oscillation, reciprocating or frequent start and stop operations that makes lubrication insignificant are required.
- ✦ Where deterioration of lubrication oil occurs due to non-maintenance for a long time.
| Type | Base Material | Application range |
Physical Properties |
||||||||
| maximum allowable load | maximum allowable sliding speed | maximum allowable PV value | Limit Temperature | Specific gravity | Hardness | Elongation | Tensile strength | Coefficient of linear expansion | |||
| N / mm2 | m / min | N / mm2 m / min |
0c | % | N / mm2 | 10 -5/ 0c | |||||
| Solid Lubricant Bearing | Metal | Copper Alloy | 100 | 15 | 200 | 300 | 8.0 | HB 210 or more | 12 or more |
775 or more |
1.9 |
| FG260 | 5 | 50 | 50 | 400 | 7.1 - 7.3 |
HB 100 -200 |
----------- | 150 -250 |
1.0 | ||
| Case Hardening Steel | 30 | 10 | 60 | 400 | 7.8 | HRC 55 or more | 17 or more |
700 or more |
1.1 | ||
| Oilless Bearing | Slide Bearing With Lubrication | Roll Bearing | ||
| Lubricatiting Conditions | Acceptable without lubrication | Lubrication is required | Acceptable without lubrication on some cases | |
| Bearing Conditions | Lord resistance | Good for extreme high load | Depend on lubrication and speed | Not good |
| Speed resistance | Good for low / medium speed | Good for medium / high speed | Good for medium / high speed | |
| Oscillating characteristics | Good | Not Good | Not good | |
| Intermittent operation | Good | Not Good | Good | |
| Reciprocating operation | Good | Not Good | Not good expect for special bearing | |
| Impact resistance | Good | Good | Not good | |
| Fretting resistance | Good | Good | Not good | |
| Coefficient of friction | Relatively high | Depends on lubrication, load and speed | Very small | |
| Environment Conditions | Heat resistance | Good depending on the type | Depends on oil heat resistance | Not good |
| Corrosion resistance | Good depending on the type | Good depending on the type | Not good | |
| Waterproof | Good | Not good except for special bearing | Waterproof is required | |
| Soundproof | Good | Good | Not good | |
| Effect by foreign matter | Minor | Minor | Large | |
| Mating Material | Material | Usually special steel | Usually special steel | Normal steel |
| Surface finish | 3-12 µ mR max | 3 µ mR max or less | 6-12 µ mR max | |
| Shape of material | Max. size | Generally unlimited | Generally unlimited | Limited |
| Limitation to shape | Generally unlimited | Generally unlimited | Limited | |
| Fitting | Clearance | Ralatively large | Relatively small | Extremely small |
| Tolerance | Varies depending on the type | Relatively good | Good | |
