German TBT Tiefbohrtechnik bearings, TBT Tiefbohrtechnik models, TBT Tiefbohrtechnik prices

TBT Tiefbohrtechnik bearings are 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 have high load-carrying capacity. Needle roller bearings are equipped with thin and long rollers (roller diameter D ≤ 5mm, L/D ≥ 2.5, where L is the roller length). Therefore, the radial structure is compact. When the inner diameter size and load capacity are the same as other types of bearings, the outer diameter is the smallest, making them particularly suitable for support structures with limited radial installation dimensions. Depending on the application, bearings without inner rings or needle roller and cage assemblies can be selected. In this case, the journal surface of the shaft and the housing bore surface directly serve as the inner and outer rolling surfaces of the bearing. To ensure that the load capacity and operating performance are the same as bearings with rings, the hardness, machining precision, and surface quality of the raceway surfaces on the shaft or housing bore should be similar to those of the bearing ring raceways. This type of bearing can only withstand radial loads.

TBT Tiefbohrtechnik bearing classification

1) Combined type: The combined needle roller bearing is a bearing unit composed of a radial needle roller bearing and a thrust bearing component. Its structure is compact with a small volume, high rotational accuracy, and it can withstand certain axial loads while sustaining 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: The thrust bearing consists of a thrust cage assembly with needle rollers, cylindrical rollers, or balls, and a thrust washer. 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 for bearing configurations can be provided. Due to the selection of high-precision cylindrical rollers (needle rollers) which increase the contact length, this bearing can achieve high load capacity and high rigidity in a very small space. Another advantage is that if the surfaces of adjacent parts are suitable as raceway surfaces, 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.

TBT Tiefbohrtechnik bearing installation

Installation of full-complement needle roller bearings is usually carried out using an auxiliary sleeve. At this time, the auxiliary roller or auxiliary sleeve supports the needle rollers to prevent them from falling out. The chamfer of the journal lifts the needle rollers. As the needle roller bearing moves slowly inward on the 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 (leave a gap when inserting the last needle roller), then push the auxiliary roller or auxiliary sleeve, replacing the 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 in this way: apply a thin layer of lubricating oil to the outer diameter of the auxiliary sleeve, insert it into the bearing outer ring so that the auxiliary sleeve and the bearing outer ring form an annular hole, and then install the needle rollers in the annular hole. After installing the needle rollers, use the working shaft to push out the auxiliary sleeve. For needle roller bearings without inner or outer rings, during installation, first apply a thin layer of grease to the rolling surface of the shaft or housing bore, and place the needle rollers tightly against the grease at the installation site one by one. A gap should be left when placing the last needle roller, and the size of the gap should be 0.5mm around the circumference of the needle roller bearing. Do not forcibly squeeze the last needle roller in, or install one less needle roller, because forcing it in will cause the bearing to jam and not rotate; if one is missing, the gap is too large, which can easily cause the needle rollers to twist and break during operation. For needle roller bearings with only stamped outer rings, since the outer ring wall is very thin, do not install them by hitting with a hand hammer; they should be pressed in using a press. Because hand hammering applies uneven pressure, it can easily cause local deformation of the outer ring of the needle roller bearing.

TBT Tiefbohrtechnik bearing usage methods

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 bearing 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 similar tools. 2) Bearing lubrication: The common lubricants for rolling bearings are lubricating oil and grease. When the circumferential speed of the shaft is less than 4-5m/s, or in automotive applications where lubricating oil cannot be used, grease lubrication is adopted. The advantages of grease lubrication include simple sealing structure, resistance to grease leakage, minimal influence from temperature, 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, it is advisable to fill only 1/2-l/3 of the bearing cavity. 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 moderate 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 grade of lubricating oil according to the vehicle manual and replace it timely 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 opening (depending on the specific vehicle structure and requirements); do not overfill.

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