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drylin linear technology | Slides instead of rolling! drylin linear technology | Slides instead of rolling!
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drylin is a range of maintenance and lubrication-free linear plain bearings. This range includes linear units d B d B Quiet
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with lead screw, rack and toothed belt drives. The focus is on, besides the freedom from maintenance Ball bearing drylin ® The quiet operation is also a benefit of sliding rather than
and lubrication, the ruggedness and insensitivity to influences such as dirt, water, chemicals, heat or rolling. There are no loud collisions between a hard steel
impacts. ball and the glide surface. The sliding motion is extremely
quiet and only a light friction noise is audible.
Speed Speed
Figure 01: Comparison of noise development
Maximum stroke lengths
The lining up of guide rails (joining) poses no challenge for
drylin linear guides. The guide rails are slightly chamfered,
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● Maintenance-free ● Dry operation aligned and simply placed behind each other. The joint can
● Wear-resistant ● Suited for short-stroke applications be passed over by the sliding element without problems.
● Resistant to impacts and vibrations ● High static load capacity With the drylin linear plain bearings, a ball or roller cannot
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● Corrosion-resistant ● High speeds and accelerations possible get stuck. In this way stroke lengths of more than 20
● Resistant to dirt, dust and humidity ● Self-lubricating meters can be implemented. Assembly is simplified by the
● Low coefficient of friction ● Extremely quiet operation distinctive joint marking provided at the factory.
● Weight reduction ● Low level of magnetism
Track joint
Optimum load distribution
drylin linear plain bearings operate on sliding elements
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unlike the traditional recirculating ball bearing systems. This
gives a larger contact surface resulting in lower surface
pressure. This leads to advantages which include:
● The use of non-hardened shafts Permitted speeds/acceleration
Rolling bearings - Point contact ● The use of non-metallic shafts drylin linear plain bearings do without rollers and balls. This
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● Scratching and shaft damage is completely excluded
makes the bearing independent of the mass inertia of this
body and can be used with high speeds up to 10m/s and
Shafts and rail materials accelerations up to 100g.
The large surface area of drylin linear plain bearings, when drylin linear bearings are therefore especially suitable for
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compared to traditional ball bearings, means that under a applications with light loads, where the speeds should be
given load the bearing pressure is greatly reduced. This increased. The use of hard-anodised aluminium as a friction
allows soft shaft materials to be used, including hard- partner lowers the operating temperature in the bearing
anodised aluminium, which in turn gives additional benefits due to the high thermal conductivity of aluminium. Thus the
Plain bearings - Surface contact in friction and wear rate values, carbon fibre shafts, which operation can be carried out with a high frequency even at
offer the lightest option and stainless steel for the highest very short stroke lengths.
chemical resistance. Of course, hardened steel and The maximum average surface speed results from the
stainless steel shafts as well as hard-chromed shafts can load on the bearings. With decreasing surface load, higher
also be used with drylin linear bearings.
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speeds can be achieved. More important than the maximum
Dry operation, without lubrication Thermal conductivity [W / m ∙ K] speed reached is the average speed over a period of time,
because this has the most influence on the heating of the
drylin linear bearing systems are designed for dry operation. Aluminium 235 bearing system. In cases with breaks between the individual
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As there is no grease or oil present, the application tends Unalloyed steel 48 - 58 cycles, the maximum average surface speed is critical,
Resistant to dirt, dust and moisture - by lubrication to naturally self clean, any particles are wiped away from High-alloyed steel 15 which is achieved during a period of 10 to 30 minutes.
free insert and dirt channels. the sliding surface by the ribbed design of the drylin Table 01: Thermal conductivity
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polymer bearing. This works well in coarse dirt or even
sand. Particles are repelled from the contact surface by the Average surface speed
movement itself. Here the front of the sliders works like a = Travel distance per cycle [m] / total cycle time [sec].
wiper. The contact surface remains clean. ASEAN 09/2023 ASEAN 09/2023
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