VIIPLUS self-lubricating bushings are based on metal materials, and holes are arranged in an orderly manner on the substrate, and oil-containing graphite or molybdenum dioxide is embedded as a solid lubricant.
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Self-lubricating bushings are made of the metal body and inserted with solid lubricant in line, which is made of graphite or MoS2 with oil. While the bearing running with no oil. the solid lubricants will run out to the working surface by friction heat and reduce the friction coefficient.
Selecting the proper base metal and alloy is crucial to the sucessful application of a self-lubricated bushing. There are many factors to consider that influence the the bearing suitability to the application. Some are Speed, Load, Environment, Mating Material and Temperature.
Deposits (boreholes or groves) of solid lubricant are distributed with a proportion from 25% to 35% on the sliding surface of the base material.
The overlapping geometrical distribution of the deposits assures the lubrication of the entire surface.
During operation, a compact adhesive lubricating layer forms on the sliding surfaces, reducing direct solid-state contact to a minimum and protecting the sliding counterpart.
Our lubricants contain effective friction and wear-reducing elements, as well as corrosion-protecting supplements.
Metallic abrasion and impurities penetrating the sliding area are absorbed by the deposits, avoiding greater damage to the sliding surfaces.
The friction in VIIPLUS bearings is influenced by operating conditions, material, roughness, as well as the hardness of the sliding counterpart. The coefficient of friction ranges from 0,04 to 0,12, reaching the upper boundary towards the end of service life.
The temperature range of VIIPLUS standard elements extends from -50°C to 150°C. Special designs with wider temperature ranges (up to 200°C) are available on request.
The friction occurring in VIIPLUS-bearings is influenced by the material, roughness, and hardness of the sliding counterpart, as well as by the operating data. The coefficient of friction lies in the range of 0,06 ≤f ≤0,12 with an upper boundary tendency towards the end of service life.
| Technical Data | |
|---|---|
| Material | CuZn24AL6 |
| Hardness | HB230-270 |
| Coefficient of friction(μ) | <0.16 |
| Max. Temp. | 300℃ |
| Max. dynamic load | 100 N/mm² |
| Max. speed(Dry) | 0.4 m/s |
| Max. speed (Lubrication) | 5 m/s |
| PV limit | 3.8 N/mm² *m/s |
| Chemical Compositions | ||||||||
|---|---|---|---|---|---|---|---|---|
| Chemical Compositions % | ||||||||
| Cu | Zn | Al | Fe | Mn | Si | Ni | Sn | Pb |
| 64.24 | 25.10 | 5.17 | 2.67 | 2.82 | <0.1 | <0.5 | <0.2 | <0.2 |
| Basic material | Material hardness |
| CuZn25A16FeMn4 | 210-250 HB |
| CuSn6Zn6Pb3 | 80-120 HB |
| Steel+CuSn6Zn6Pb3 | 60-90 HB |
| HT 250 | 180-230 HB |
| GCr 15 | HRC 55-60 |
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