German WUMO bearings WUMO models WUMO prices

WUMO bearings are a type of rolling bearing and one of the widely used components in modern machinery. They support rotating parts through rolling contact between main elements. Roller bearings are now largely standardized. Roller bearings offer advantages such as low starting torque, high rotational accuracy, and ease of selection. Rolling bearings are classified into ball bearings and roller bearings based on the rolling elements. Roller bearings support rotating parts through rolling contact between main components. Different roller bearings can withstand different radial and axial loads. When selecting roller bearings, selection should be made according to specific operating conditions. Roller bearings mainly include structural types such as spherical roller bearings, thrust spherical roller bearings, tapered roller bearings, and cylindrical roller bearings.

WUMO bearing classification

1) Combined type: Combined needle roller bearings are bearing units composed of radial needle roller bearings and thrust bearing components. Their structure is compact with small volume, high rotational accuracy, and they can withstand certain axial loads while bearing high radial loads. Furthermore, the product features diverse structural forms, wide adaptability, and ease of installation. Combined needle roller bearings are widely used in various mechanical equipment such as machine tools, metallurgical machinery, textile machinery, and printing machinery, enabling very compact and agile mechanical system designs. [2) Thrust type: Thrust bearings consist of thrust cage assemblies with needle rollers, cylindrical rollers, or balls, and thrust washers. The needle rollers and cylindrical rollers are retained and guided by the thrust cage. When used with DF thrust bearing washers of different series, many different combinations can be provided for the bearing configuration. Due to the use of high-precision cylindrical rollers (needle rollers) which increase the contact length, this bearing can achieve high load capacity and high stiffness in a very small space. Another advantage is that if the surfaces of adjacent parts are suitable as raceways, the washers can be omitted, allowing for a compact design. The cylindrical surfaces of the needle rollers and cylindrical rollers used in DF thrust needle roller bearings and thrust cylindrical roller bearings are profiled surfaces, which can reduce edge stress and improve service life.

WUMO bearing installation

Installation of full-complement needle roller bearings is usually performed using an auxiliary sleeve. In this process, the auxiliary roller or auxiliary sleeve holds the needle rollers to prevent them from falling out. The shaft journal uses its own chamfer to lift the needle rollers. As the needle roller bearing moves slowly inward on the shaft journal, the auxiliary roller or auxiliary sleeve gradually withdraws until it reaches the working position. The outer diameter of the auxiliary roller or auxiliary sleeve should be 0.1―0.3mm smaller than the shaft diameter. During installation, first apply grease to the inner surface of the bearing outer ring, place the needle rollers against the inner surface (leaving a gap when inserting the last needle roller), then push the auxiliary roller or auxiliary sleeve, replacing the shaft journal or bearing inner ring, into the outer ring hole. Align its end face with the installation shaft end face or the end face of the bearing inner ring already installed on the shaft, and then apply pressure using a press or hand hammer. Needle roller bearings can also be installed by coating the outer diameter of the auxiliary sleeve with a thin layer of lubricating oil, inserting it into the bearing outer ring so that the auxiliary sleeve and bearing outer ring form an annular hole, and then installing the needle rollers into the annular hole. After installing the needle rollers, push out the auxiliary sleeve with the working shaft. For needle roller bearings without an inner or outer ring, during installation, first apply a thin layer of grease to the rolling surface of the shaft or housing bore, and place the needle rollers sequentially against the grease at the installation site. A gap should be left when placing the last needle roller; the size of the gap on the circumference of the needle roller bearing should be 0.5mm. Do not force the last needle roller in, nor install one less needle roller. Forcing it in will jam the bearing preventing rotation; installing one less results in excessive gap, easily causing the needle rollers to twist and break during operation. For needle roller bearings with only a stamped outer ring, since the outer ring wall is very thin, do not install by striking with a hand hammer; use a press for insertion. Striking with a hand hammer applies uneven pressure, easily causing local deformation of the needle roller bearing's outer ring.

WUMO bearing usage instructions

1) Bearing disassembly and assembly: Clean the bearing thoroughly before installation. During installation, use special tools to press the bearing in evenly and straightly; do not strike it with a hand hammer, and strictly prohibit striking the bearing directly. If the fit between the bearing ring and the housing bore is loose, repair the housing bore or replace the bearing; do not resort to makeshift measures such as knurling the mating surface or inserting copper shims. When removing the bearing, use an appropriate puller to extract it; do not strike the bearing with chisels, hand hammers, or other tools. 2) Bearing lubrication: The common lubricants for rolling bearings are lubricating oil and grease. Grease lubrication is used when the circumferential speed of the shaft is less than 4-5m/s, or for automotive applications where lubricating oil cannot be used. The advantages of grease lubrication include simple sealing structure, minimal grease loss, low sensitivity to temperature changes, and long service life per application. Two points should be noted when using grease: First, select the appropriate grade of grease according to the vehicle manual. For example, sodium-based grease is not suitable for automotive water pump bearings due to its poor water resistance. Second, add an appropriate amount of grease into the bearing; generally, filling 1/2-l/3 of the bearing cavity is sufficient. Excessive grease is not only useless but also increases operating resistance, causing heating. Special attention should be paid to automotive wheel hub bearings; "hub-empty lubrication" is recommended, meaning only a proper layer of grease should be applied to the bearing. Otherwise, it will not only cause waste and poor heat dissipation but also lead to grease overflow due to heating, which may affect braking performance. The advantages of oil lubrication include low frictional resistance and heat dissipation capability; it is mainly used for high-speed bearings and those operating in high-temperature environments. Select the oil grade according to the vehicle manual and replace it promptly according to the maintenance schedule. After draining the old oil, clean the mechanism before adding new oil. Fill the oil to the specified mark or level with the filler port (depending on the specific vehicle structure and requirements); do not overfill.

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