self-lubricating bushes composite bearing material developed specifically to operate with marginal lubrication and consists of three bonded layers: a steel backing strip and a sintered porous bronze matrix, impregnated and overlaid with a pigmented acetal copolymer bearing material
Sliding Bearings POM (MoS2)/lubrication pockets

Sliding Bearings POM (MoS2)/lubrication pockets

Discover our plain bearings: Flange bearings, sleeve bushings, and thrust washers. Customizable bushing materials available. Our products are wear-resistant, maintenance-free, and designed to withstand dirt, dust, and corrosion.

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Movement applications using bearings can be found in every industry: slow and fast applications, light and heavy applications, abrasive and clean applications. Every industry has its own preference for a bearing type, for example sliding bearings, and every application in turn has its preference for specific variants such as a POM sliding bearing. Viiplus Industrie are dealers for very high quality POM sliding bearings.

self lubricating bushes plain sliding bearings9

POM sliding bearings were developed for lubricated applications and consist of three layers: a steel mantle and a sintered bronze layer impregnated and overlaid with polyacetal (POM) bearing material. The steel mantle provides the mechanical strength while the sintered bronze layer ensures a solid bond between the steel mantle and the running layer. POM sliding bearings were developed for applications with grease lubrication and the running surface is generally provided with a pattern of lubrication indentations that serve as reservoirs for the grease.

Dry Sliding Bearings Bushings Sliding layerPOM (MoS2)/lubrication pockets Composite Material,Low-maintenance and maintenance-free plain bearings,Material information in detail.

steel backing strip with sintered bronze and Sliding layerPOM (MoS2)/lubrication pockets,

Metric Wrapped Sliding layerPOM (MoS2)/lubrication pockets Lined Plain Bearing,

Plain Bearing,Wrapped Sliding layerPOM (MoS2)/lubrication pockets Lined Material

Strip Size Metric / Imperial: Metric (mm)
Length: 500mm
Thickness (Sheets and Washers): mm
Width:mm

  • 250mm x 500mm x 1mm sheet
  • 250mm x 500mm x 1.5mm sheet
  • 250mm x 500mm x 2mm sheet
  • 250mm x 500mm x 2.5mm sheet

Sliding bearings The material in a wide variety of designs is produced by bearings with steel support or bearings with bronze support,  POM layer, composite material, plain bearing strips in the cutting, molding and shaping processes. Standard designs for plain bearings are cylindrical bushes,
Collar bushings, thrust washers, strips

Dry sliding bearings is a composite bearing material comprising 3 layers: Steel support strip, Sintered bronze layer, POM layer.

Characteristics

Suitable for dry running

Bearing backed:

Material: Steel

Unique features:
Universal use
Low friction, high wear resistance
Extremely good performance, as self-lubricating parts materials

Viiplus POM composite strips have pockets in the sliding surface , which serve as grease reservoirs and should be filled with grease prior to installation. This makes these strips suitable for applications that require minimal maintenance under difficult operating conditions, for example in contaminated environments where lubricant cannot be supplied continuously or frequently. Despite of their compact design, POM composite strips can accommodate heavy loads and are less sensitive to misalignment. They are suitable for slow rotational or oscillating movements.

POM composite strips consists of a sheet steel backing on which a 0,2 to 0,4 mm thick layer of tin/bronze is sintered. The principal characteristic of these strips is their relatively thick (0,3 mm) covering layer of acetal resin (POM – polyoxymethylene) with additives. This covering layer has pockets to retain grease and is firmly attached to the sintered tin/bronze layer .

The thickness of the covering layer makes these strips less sensitive to misalignment and the edge loading associated with that misalignment.

Applications

POM bearings are especially suited to severe operating conditions where frequent maintenance is not possible. Common applications are:

  • Hydraulic applications
  • Elevators
  • Transportation
  • Mechanical engineering
  • Construction machinery

Lubrication required

Unique features:
Lifetime lubrication possible
Low consumption
Low sensitivity to edge loading
Good damping characteristics
Insensitive to impacts
Good chemical resistance

Specification overview

Properties TX
Max. load (Dyn/stat), N/mm2 140 / 250
Max. sliding speed m/s 2.5
Max. PV value N/mm2 x m/s 2.8
Temperature range, oC -400 / +130
Shaft tolerance f7 – h8
Housing tolerance H7
Shaft roughness Ra ≤ 0.4
Shaft hardness > 200 HB

Lubrication

We recommend lubricating POM bearings with grease. The grease must contain an antioxidant for environments with temperatures over 50°C. Greases containing EP additives or significant amounts of graphite or MoS2 are not generally recommended.

Lubricating with oil is only advisable with applications in which the oil temperature does not exceed 70°C.

Advantages

Main advantages of POM bearings include:

  • Minimal maintenance
  • High sliding velocity
  • High load capacity
  • Low friction coefficient
  • Minimal bearing play

Design

  • Cylindrical bearings
  • Flanged bearings
  • Thrust washers
  • Plates
  • Drawing details

Standard materials for plain bearings

 

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