Bushing are available in turust washer shape.
Viiplus composite dry sliding thrust washers are designed for applications where axial space is limited, maintenance is not possible and where lubricant starvation can occur.
As well as for composite bushings and strips, Viiplus manufactures composite thrust washers as standard from POM composite material
POM composite thrust washers
Viiplus POM composite thrust washers have pockets in the sliding surface , which serve as grease reservoirs and should be filled with grease prior to installation. This makes these washers 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 washers can accommodate heavy axial loads and are less sensitive to misalignment. They are suitable for slow rotational or oscillating movements.
POM composite thrust washers 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 washers 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 washers less sensitive to misalignment and the edge loading associated with that misalignment.
POM Composite sliding washers are specially designed to operate with marginal
lubrication. The sliding surface has a highly effective grease retention system
with lubrication pockets, which serve as grease reservoirs. POM Composite consists of three bonded layers: a copper plated steel backing strip and a sintered porous tin bronze matrix covered with an acetal (polyoxymethylene, POM) resin.To protect the washer from corrosion the steel backing is tin plated. All POM Composite sliding bearings can be machined. However, any machining of the sliding surface should only be undertaken in exceptional cases.
- Wrapped composite sliding bearing
- Tin-plated steel / acetal resin (POM)
- DIN 1494 / ISO 3547
- With lubrication pockets
- Flanged sliding bearings on request
Suitable for grease or oil lubrication and all kinds of movement, good load capacity, robust and insensible to dirt.
1.POM thickness 0.30~0.50 mm, it provides high wear resistance and low friction even with only minute volume of lubricant are supplied, this bearing surface carries a pattern of circular indents which should be filled with grease on assembly of the bearing.
2. Sintered bronze powder thickness 0.20-0.35mm, provides max. thermal conductivity away from the bearing surface, also serves as a reservoir for the resin mixture.
3. Low-carbon steel, provides exceptionally high load carrying capacity, excellent heat dissipation.
4. Copper/Tin plating thickness 0.002mm, provides good corrosion resistance.
Particularly suitable for heavy-duty, low-speed rotary motion, rocking motion, and frequent fluid-lubricated parts that are opened and closed under load. Long-term use without boundary lubricationcan be achieved without refueling, while refuelling can be used during the process. The service life is more prolonged; the plastic layer on the surface can leave a certain margin when the shaft sleeve is formed and can be processed by pressing it into the opening to achieve a better assembly size
Recommended for applications involving intermittent operation or boundary lubrication…
Automotive: suspension joints, kingpin assemblies and stub axles of tucks, automobile driving joint hinges, steering and other linkages, articulation joints, rear chassis hinges, fair leader rollers…
Machine tool building industry: spindles in drill, grinding, and milling machines, ram guide plates in multi-ram presses…
Agricultural equipment: gearbox, clutch, bale trips and wheel caster swivels for bale accumulators, front axle pivot bearings, steering idler box bearings and kingpin bearings for harvesters… It is especially well-suited for applications where lubricant can not be supplied continuously or repeatedly.
POM coated self-lubricating thrust washers for lubrication or oil lubrication applications.
The standard parts contain grease in the sliding layer, and the ordinary sliding layer should be provided upon request.
the best performance at high load and low speed.
suitable for straight, swing and rotary motion.
a wide variety, available for use on the spot.
|Max.Load ||Static ||140 N/mm2 |
|Dynamic ||70 N/mm2 |
|Max line speed V(m/s) ||Grease lubrication ||2.5 m/s |
|PV value limit (N/mm2.m/s) ||2.8N/mm2.m/s |
|Operating Temperature ||-60°C~+120°C |
|Friction Coeff. ||0.06~0.12μ |
|Hardness (HB) ||>270HB |
|Roughness(Ra) ||0.4~1.25 |
|Coeff. Of linear expansion ||11×10-6/K |