DJA MOND multilayer POM relubricable bushings

PT..RK Series

  • Pre-lubricated
  • Low maintenance
  • Suitable for applications with impact loads

POM multilayer bushings are three-layer plain bearings consisting of a steel backing, a porous bronze intermediate layer and a POM or composite PEEK sliding layer. Pre-lubricated and designed for low maintenance, they are suitable for applications involving shock loads and high sliding speeds. POM plain bearings require only a small amount of lubricant to provide reliable long-term performance. DJA MOND PT..RK multilayer POM bushings offer low wear, excellent anti-friction performance and high PV values. Compared with other relubricable bushings (case-hardened, bronze wrapped or bimetallic bushings), POM multilayer bushings are the ideal solution where minimal lubrication and good shock-load capability are more important than maximum load capacity or extreme temperature resistance.

The backing of these POM plain bearings is manufactured from low-carbon steel and coated with a 2 μm copper layer or alternative protective treatment. A sintered porous bronze layer is then applied, providing support for the POM or composite PEEK sliding layer with lubricant reservoirs. Initial greasing is required, while periodic relubrication is generally not necessary. However, continuous lubricant supply can further extend the service life of the bearing.

Versions

Three multilayer bushing variants for specific machining requirements

The low-maintenance "RK" sliding material is available in three versions.

  1. RK - Ready for mounting

    Ready for mounting · Lubricant reservoirs

    Three-layer structure consisting of a steel backing, a porous bronze intermediate layer and a POM/PEEK sliding layer with lubricant reservoirs, designed to retain grease and collect any contaminants between the shaft and the bushing.

  2. RKT - With machining allowance

    Machining allowance · For housings or shafts with less precise machining

    Same structure as the RK version, featuring a sliding layer with an average additional thickness of more than 0.15 mm. The machining allowance can be internally machined with high precision to compensate for misalignment or achieve tighter running clearances.

  3. RK3 / RKT3 - Special version without lubricant pockets

    Upon request · Without lubricant reservoirs

    Available upon request, this special version differs from the previous versions due to the absence of lubricant reservoirs in the sliding layer.

Performances

Design and performance features

Maintenance

Pre-lubricated, low maintenance

They require only initial lubrication with grease and do not require periodic relubrication. However, continuous lubricant supply can further extend the service life of the bearing.

Friction and wear

Low wear rate

Excellent friction performance, low wear rate, high load capacity, negligible stick-slip effect and minimal running clearance.

Resistance

Good chemical resistance, low water and moisture absorption, high PV capability and excellent anti-friction performance, even in the presence of impact loads.

Construction

The POM/PEEK sliding surface features lubricant reservoirs designed to retain grease and collect any contaminants trapped between the shaft and the bushing.

Mounting

Mounting of POM multilayer bushings

POM multilayer bushings must be installed with an interference fit, with the joint area positioned opposite the load direction. A stepped mandrel should be used, and the housing should be provided with 15°/20° lead-in chamfers to facilitate assembly.

Mounting methods

  1. Stepped mandrel with 15°/20° lead-in chamfers15°/20° lead-in chamfers on the H7 tolerance housing bore to facilitate assembly without damaging the sliding layer.
  2. 02 | Turning and boring operations (if required)Dry machining. Cutting speed: 100–150 m/min. Feed rate: 0.05 mm/rev. Depth of cut: 0.1 mm. Carbide cutting tool.

Technical data

Housing
H7
Lead-in chamfers
15°/20°
Shaft surface roughness
Up to 0.8 μm

Applications

Applications of PT..RK bushings

Components and application support for every industrial environment.

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Agriculture

Applications with limited continuous lubrication and demanding operating conditions, where low maintenance requirements provide a significant advantage.
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Construction Equipment

The excellent damping properties make these bushings resistant to the shocks typically encountered in this type of equipment, while ensuring reliable performance even in dirty operating environments.
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Transmissions and axles

Suitable for rotary and oscillating motions with low sensitivity to edge loading. The RKT version allows precision machining to compensate for housing and shaft components manufactured with wider tolerances.
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Automotive / Motorcycles, Trucks & Buses

Components for suspension, transmission and linkage systems designed for intensive duty cycles, vibration and compact spaces.
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Hydraulic and pneumatic cylinders

Bushings, spherical plain bearings and seals for precise guidance of rods and joints, even under load.
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Metal Fabrication / Machining Industry

Solutions for machine tools, machining centres, equipment and precision machining.
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Renewable Energy

Bearings and motion systems for wind power, solar installations and long-lasting energy technologies.

Contacts

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