German RICHCO bearings RICHCO models RICHCO prices

RICHCO roller bearings with cylindrical rollers, where the rollers are thin and long relative to their diameter. 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, L is the roller length), resulting in a compact radial structure. 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 rings. This type of bearing can only withstand radial loads.

RICHCO 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 compact structure features a small volume and high rotational accuracy, allowing it to withstand certain axial loads while sustaining high radial loads. Furthermore, the product offers 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 highly 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 can be provided for the bearing configuration. The use of high-precision cylindrical rollers (needle rollers) increases the contact length, allowing this bearing to 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 raceways, the washers can be omitted, resulting in 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.

RICHCO bearing installation

When installing full-complement needle roller bearings, an auxiliary sleeve is typically used. 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, and as the needle roller bearing slowly moves 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 placing the last needle roller), then push the auxiliary roller or auxiliary sleeve, which replaces the journal or bearing inner ring, into the outer ring hole, aligning 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 applying a thin layer of lubricating oil to the outer diameter of the auxiliary sleeve, inserting it into the bearing outer ring to form an annular hole with the bearing outer ring, and then installing the needle rollers in the annular hole. After installing the needle rollers, push out the auxiliary sleeve with the working shaft. 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. Leave a gap when placing the last needle roller; the size of the gap should be 0.5mm around the circumference of the needle roller bearing. Do not force the last needle roller in or install one less needle roller, as forcing it in will cause the bearing to jam and not rotate, and installing one less will create excessive gap, causing the needle rollers to twist and break during operation. For needle roller bearings with only stamped outer rings, due to the thin wall of the outer ring, do not install them by hitting with a hand hammer; instead, use a press to press them in. Hitting with a hand hammer causes uneven pressure, which can easily cause local deformation of the outer ring of the needle roller bearing.

RICHCO bearing usage method

1) Bearing disassembly and assembly: Clean the bearing thoroughly before installation. During installation, use special tools to press the bearing in evenly and straight; do not strike it with a hand hammer, and strictly prohibit direct striking on the bearing. 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 fit surface or inserting copper shims. When removing the bearing, use a suitable puller to extract it; do not strike the bearing with chisels, hand hammers, or other tools. 2) Bearing lubrication: Common lubricants for rolling bearings include lubricating oil and grease. Grease lubrication is used when the circumferential speed of the shaft is less than 4-5m/s, or for locations on vehicles where lubricating oil cannot be used. The advantages of grease lubrication include a simple sealing structure, minimal grease loss, low sensitivity to temperature, and long service intervals per application. Two issues require attention 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, apply an appropriate amount of grease into the bearing; generally, filling 1/2-l/3 of the bearing cavity is advisable. Excessive grease is not only useless but also increases operating resistance, causing heating. Special attention should be paid to automotive wheel hub bearings; "empty hub lubrication" is recommended, meaning only an appropriate layer of grease is applied to the bearing itself. Otherwise, it not only causes waste and poor heat dissipation but may also cause the grease to overflow due to heat, potentially affecting 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 higher ambient temperatures. Select the grade of lubricating oil 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 opening (depending on the specific vehicle structure and requirements); do not overfill.

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