Features of Oil Free Bushings/Washers

Material Properties and Allowances (Reference Values)

Page P.297-298 P.299-312 P.313 P.314-316 P.316 P.317-318
Type Bronze Type Brass Type Casting Type Multi-layer Type High Precision Type Resin Type (Polyacetal) Resin (Polytetrafluoroethylene)
Shape Single Axis Unit Features Single Axis Unit Features Single Axis Unit Features Single Axis Unit Features Single Axis Unit Features Single Axis Unit Features Single Axis Unit Features
Material Properties
Porous Bronze Casting soaked in lubrication
Composite products embedded solid lubricant in high tensile brass
Molybdenum Disulfide is embedded spirally in FC250
Composite product consisting of 3 layers : Steel Black metal,Sintered bronze,Filler filled  Polytetrafluoroethylene
Fluororesin is bonded on base material (A2017)
Polyacetal resin that has added lubricant and special fillers evenly
Polytetrafluoroethylene resin that has added friction resisting filler and solid lubricant
Lubrication Regular Oil Unlubricated Regular Unlubricated Regular Unlubricated Unlubricated Unlubricated Unlubricated
Rotation Good Good Good Good Good Good Good
Oscillating Motion Good Good Good Good Good Good Good
Reciprocating Motion Good Good Good Good Good Good Good
Operating Temp
Range (℃)
-40~150 -40~ 200 -40~ 150 -40~150 -200~280 -50~140 -40~80 -200~200
Electric Conductivity Provided Provided Provided Provided Not Provided Not Provided Volume Resistivity
: 3x10² W.cm²
Single Axis Unit Features In Air Good Good Good Good Good Good Good
In Oil Good Good Good Good Poor Good Good
In Water Poor Poor - Poor Acceptable Poor Acceptable Good
In Sea Water Poor Poor - Poor Poor Poor Acceptable Good
In Chemical Poor Poor - Poor Acceptable Poor Acceptable Good
In Corrosive Atmosphere Poor Acceptable Acceptable Poor Acceptable Good Acceptable Good
See Product Detail

Good: Applicable or Excellent Acceptable : Applicable only under certain conditions Poor:Not Applicable
Some values for casting type are for reference only. Values for High Precision Type are values for the base material.

Test Data of Bronze Type

Journal Rotation Test

<Test Conditions>
Bushing :SHBZ30-30
Shafting :S45C HRC50
Surface Pressure :1.47N/mm2{15kgf/cm2}
Velocity :0.83m/S(50m/min)
Testing Time :50h
Lubrication :Apply oil every hour
Features

Bushing made of bronze and porous elements soaked in lubricant. Excels in abrasion, heat and corrosion resistance in the oiling condition. Best for high speed and low load. The lubrication frequency can be reduced. 4 types are available: Standard Inner Diameter E7, F7, Flanged and Flange integrated.

Test Data of LF Multi-Layer Type Bearing

Journal Rotation Test

<Test Conditions>
Bushing :LFZB40-30
Shafting :S45C
Surface Pressure :14.7, 8.8, 2.9N/mm2
   {150, 90, 30kgf/cm2}
Velocity :0.088, 0.167, 0.500m/s
   {5.3, 10, 30m/min)
Lubrication :Unlubricated

Features

Thin wall, light weight and compact. Consistently low friction coefficient and high abrasion resistance under high load and low speed conditions. With lubricating oil, high PV values can be obtained even under medium and high speed operations. Excels in chemical resistance.

Test Data of Copper Alloy Type

Journal Rotation Test

<Test Conditions>
Bushing :MPBZ20-20
Shafting :S45C HRC46˜ 48
Oscillation Angle :±45⁰
Surface Pressure :1.47N/mm2{15kgf/cm2}
Velocity :0.83m/S(50m/min)
Testing Time :50h
Lubrication :Apply oil every hour
Features

Oil free, high performance in high load and low speed. High friction resistance in locations where oil film formation is impeded by reciprocating motion, oscillating motion, or frequent starts and stops.
Space-saving, almost as thin as multi-layer LF bushings.
As lubricant has been embedded in the flange part, the bushing can bear radial load and thrust load at the same time. 3 types are available: Standard, Flat Head Screw Hole and Low Head Bolt Hole.

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