German SNR bearings, SNR models, SNR prices

SNR roller bearings with cylindrical rollers; relative to their diameter, the rollers are both thin and long. These rollers are called needle rollers. Despite having a small cross-section, the bearings still exhibit high load-carrying capacity. Needle roller bearings are equipped with thin, long rollers (roller diameter D ≤ 5mm, L/D ≥ 2.5, where L is the roller length), resulting in a compact radial structure. When the inner diameter and load capacity are the same as other bearing types, the outer diameter is minimized, making them particularly suitable for support structures with limited radial installation space. Depending on the application, bearings without inner rings or needle roller and cage assemblies can be selected. In such cases, the shaft journal surface and housing bore surface mating with the bearing serve directly as the inner and outer rolling surfaces of the bearing. To ensure that load capacity and operating performance match those of bearings with rings, the hardness, machining accuracy, and surface quality of the raceway surfaces on the shaft or housing bore should be similar to those of the bearing rings. This type of bearing can only withstand radial loads.

SNR bearing introduction

Linear bearings are linear motion systems used in conjunction with linear strokes and cylindrical shafts. Since the load-bearing balls make point contact with the bearing outer sleeve, the steel balls roll with minimal frictional resistance. Therefore, linear bearings feature low friction and high stability, unaffected by bearing speed, enabling smooth linear motion with high sensitivity and precision. Linear bearings have limitations, primarily poor impact load capacity and lower load-carrying capacity. Secondly, linear bearings generate significant vibration and noise during high-speed motion. Automated selection of linear bearings is included. Linear bearings are widely used in sliding components of industrial machinery such as precision machine tools, textile machinery, food packaging machinery, and printing machinery. Due to the point contact between the load-bearing balls and the bearing, the applicable load is small. The steel balls rotate with extremely low frictional resistance, thereby achieving high-precision smooth motion. Plastic linear bearings are self-lubricating linear motion systems. The main difference from metal linear bearings is that metal linear bearings operate on rolling friction, with point contact between the bearing and the cylindrical shaft, making them suitable for low-load, high-speed motion; whereas plastic linear bearings operate on sliding friction, with surface contact between the bearing and the cylindrical shaft, making them suitable for high-load, medium-to-low speed motion.

SNR bearing features

Linear bearings are used in conjunction with hardened linear drive shafts as systems for infinite linear motion. Because the load-bearing balls and the hardened drive shaft have point contact, the permissible load is small; however, during linear motion, frictional resistance is minimal, precision is high, and motion is rapid. Plastic linear bearings have no special requirements for the mating shaft; they can withstand greater loads than metal bearings. However, since the motion between the bearing and the shaft is sliding friction, the speed of plastic linear bearings is somewhat limited; motion resistance is higher than that of metal linear bearings; but motion noise is lower than that of metal linear bearings, especially at medium-to-high speeds, where the noise of plastic linear bearings is minimally affected by speed. Due to the internal chip removal groove design, plastic linear bearings allow use in dusty environments; dust is automatically carried out from the bearing body friction surface through the chip removal grooves during motion. Plastic linear bearings also allow cleaning during use, and the internal sliding film made of special materials can even operate in liquids for extended periods.

SNR bearing maintenance

Maintenance of metal linear bearings: Lubrication and friction: Anti-corrosion oil is injected into the interior of linear bearings. If grease lubrication is used, first remove the anti-corrosion oil with kerosene or an organic solvent, air dry, and then add lithium soap grease. (It is recommended to use lithium soap grease with a viscosity mark of N0.2.) If oil lubrication is used, there is no need to remove the anti-corrosion oil; select lubricating oil with ISO viscosity grade VG15-100 according to temperature changes. Shaft lubrication can be supplied via an oil supply pipe or through oil holes on the outer bearing housing. Since seals will scrape off lubricating oil, oil lubrication is not suitable for sealed bearings without oil holes. Maintenance of plastic linear bearings: Since the sliding film inside plastic linear bearings is made of self-lubricating plastic, no additional oil supply or maintenance is required during use. Moreover, because plastic linear bearings have chip removal grooves, no maintenance is needed even if the bearing or shaft is clogged with dust; dust is automatically carried out through the chip removal grooves during motion. Only when the sliding film wears out and fails does it need to be replaced directly; maintenance is very convenient.

Weidou Intelligent Technology specializes in selling German SNR plain bearings, SNR rolling bearings, SNR spherical plain bearings, SNR deep groove ball bearings, SNR angular contact ball bearings, SNR self-aligning ball bearings, SNR thrust ball bearings, SNR double-direction thrust angular contact ball bearings, SNR combination bearings, SNR thrust roller bearings, SNR needle roller bearings, SNR insert ball bearings, SNR spherical roller bearings, SNR flanged bearings, SNR linear bearings. SNR original imports from Germany. Welcome inquiries and orders from users.