Self Lubricating Bushings

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.

Base Metal and Alloys

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.

Mode of operation:

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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