Single Row Ball Roller Bearings
18Pages

Single Row Ball Roller Bearings New design between ball and roller bearings

Single row ball roller bearings Page Product overview Design and safety guidelines Dimension table Application example Schaeffler Group Industrial

Product overview Single row ball roller bearings Schaeffler Group Industrial

Single row ball roller bearings Features A new generation of rolling bearings The single row ball roller bearing BXRE from Schaeffler Group Industrial represents a completely new generation of rolling bearings. This type follows the simple and progressive design philosophy of reducing the ball as a standard rolling element to only what is necessary for transmitting the load. On both sides of the ball, the areas not involved in transmitting load were therefore removed. The result is a new geometry and a narrower rolling element than the classical ball, the ball roller. This gives a...

Single row ball roller bearings Radial and axial load carrying capacity Due to the raceway geometry and the rolling elements, ball roller bearings can support moderate axial loads in both directions as well as very high radial loads. High degree of filling The good radial load carrying capacity is achieved by the fact that the bearing contains up to 50% more rolling elements compared to a deep groove ball bearing. For example, the deep groove ball bearing 6207 contains nine rolling elements, while the comparable size BXRE207 contains fourteen. In order to achieve the high degree of filling...

Ball bearings, ball roller bearings, cylindrical roller bearings – comparison Preliminary bearing selection The different rolling bearing types have specific characteristics due to their design. Depending on the type, they are suitable for widely differing applications. Ball roller bearings are designed such that they fulfil a range of technical and economic requirements to an excellent degree. This new type can be used to achieve optimum designs for new bearing arrangements and to replace existing bearing arrangements. The following overview shows comparable rolling bearing types and...

Single row ball roller bearings The bearings are available open as well as with gap seals or lip seals. Designs with gap seals have the suffix 2Z, bearings with lip seals have the suffix 2HRS or 2RSR. Other seal designs are available by agreement. Open bearings can be lubricated with grease or oil. Bearings sealed on both sides are greased for life using a lithium soap grease with a mineral oil base. The further guidelines on grease types and greasing in Catalogue HR 1, Rolling Bearings, chapter Lubrication, must be observed. Grease chamber Matched bearing pairs Due to the flattened areas...

Operating temperature Dimensional stability Suffixes Available designs Open bearings and bearings with gap seals can be used at temperatures from –40 °C to +120 °C. Ball roller bearings with lip seals are suitable for operating temperatures from –40 °C to +110 °C. The temperature is restricted by the grease and the sealing ring material. Ball roller bearings are heat treated and dimensionally stable up to +120 °C. Temperatures above +120 °C require special heat treatment. Such designs are available by agreement and are identified by the suffixes S0 to S4 in accordance with DIN 623-1. The...

Single row ball roller bearings Design and safety guidelines Dynamic load carrying capacity and life Basic rating life The fatigue behaviour of the material determines the dynamic load carrying capacity of a rolling bearing. The dynamic load carrying capacity is described in terms of the basic dynamic load rating and the basic rating life L10 or L10h in accordance with DIN ISO 281. The fatigue life is dependent on: ■ the load ■ the operating speed ■ the statistical probability of the first appearance of failure. For rotating rolling bearings, the decisive parameter is the basic dynamic load...

Equivalent dynamic bearing load Load ratio and equivalent dynamic bearing load The equivalent dynamic bearing load P is a calculated value. This value is constant in magnitude and direction; it is a radial load for radial bearings and an axial load for axial bearings. If the load P is used, this gives the same rating life as the combined load occurring in practice. For bearings under dynamic loading, the following applies: Load ratio Equivalent dynamic bearing load P N Equivalent dynamic bearing load for combined load Fa N Axial dynamic bearing load Fr N Radial dynamic bearing load e –...

Single row ball roller bearings Operating life The operating life is defined as the life actually achieved by the bearing. It may differ significantly from the calculated value. Due to the wide variety of possible installation and operating conditions, it is not possible to precisely predetermine the operating life. The most reliable way of arriving at a close estimate is by comparison with similar applications. Static load carrying capacity Very high static loads or shock loads can cause plastic deformation on the raceways and rolling elements. This deformation limits the static load...

Minimum radial load In order to ensure operation without slippage, the bearings must be subjected to a minimum load Fr min in a radial direction. This applies particularly in the case of high speeds and high accelerations. In continuous operation, a minimum radial load of the order of P/Cr Ͼ 0,02 is therefore necessary. Speed suitability Ball roller bearings have a speed parameter of n · dm = 600 000 and therefore do not permit speeds as high as those of comparable deep groove ball bearings. Running noise Despite the large number of rolling elements, the running noise is comparable with...

Ball roller bearings Mounting dimensions Dimension table · Dimensions in mm Mass2) Basic load ratings ra Fatigue LimReferlimit iting ence 3) speed load speed Mounting dimensions Interchange with deep groove ball bearings Series The values apply for bearings of the basic design (open, without greasing). Greased and sealed bearings will differ slightly in mass from these values. Schaeffler Group Industrial