MOTION & CONTROL NSK HANDLING INSTRUCTIONS FOR BEARINGS

As one of the world's leading manufacturers of rolling bearings, linear technology components and steering systems, we can be found on almost every continent - with production facilities, sales offices and technology centres - because our customers appreciate short decision-making channels, prompt deliveries and local service. Europe »ՕՕՕՕ »ՕՕՕՕ< »ՕՕՕՕ< »ՕՕՕ Օ »ՕՕՕՕ< >ՕՕ Օ »ՕՕՕՕ< >Օ ■ՕՕՕՕ1 »ՕՕՕՕ< >ՕՕ »ՕՕՕՕ< >ՕՕ ■ՕՕՕՕ1 tmm m »ՕՕՕՕ< tmm »ՕՕՕՕ< »ՕՕՕ mi »ՕՕՕ i ' Asia »ՕՕՕ Օ ՕՕՕՕ ■ՕՕa »ՕՕՕ >ՕՕՕ »ՕՕ ■ Oceania Օ Օ Օ Օ ՕՕ Օ ta >Օ m ■ tmm m >ՕՕ >ՕՕՕ Օ Օi !ՕՕՕ« >ՕՕՕ Օ Օ4 >ՕՕՕՕ ՕՕ1 ՕՕ Օ Օ Օ Օ ՕՕՕ ՕՕ ՕՕՕ...

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For Proper Handling of Rolling Bearings

1. Prcautions for Proper Handling of Rolling Bearings Rolling bearings are used under various operating conditions with a wide variety of light to heavy loads. Since they are manufactured to a high level of accuracy, they must be handled carefully and properly; the purpose for which they are used is just as important as careful handling. Incorrect mounting and improper handling are the most common causes of premature failure. Consequently, it is clear that proper handling, as well as appropriate selection and usage, are essential. Instructions for the proper handling of rolling bearings are summarised...

2. Mounting 2.1 Fits and Clearances Table 1: Fits of Radial Bearings with Shafts Load conditions Examples Shaft Diameter (mm) Tolerance of shaft Remarks Ball bearings Cylindrical roller bearings, tapered roller bearings Spherical roller bearings Radial bearings with cylindrical bores Rotating outer ring load Easy axia Ni spha(ctement of inner 1 Wheels on stationary axles ring on shaft desirable All shaft diameters g6 Use g5 and h5 where accuracy is required. In case of large Easy ax ial displa rnent of iyner Tension pulleys rope sheaves ring on shaft unnecessary h6 bearings, f6 can be used to...

A Table 2: Fits of Radial Bearings with Housings Load conditions Examples Tolerances for housing bores Axial displacement of outer ring Remarks Radial bearings with housings Rotating outer ring load Heavy loads on bearing in thin-walled housing of heavy shock loads Automotive wheel hubs (Roller bearings) Crane travelling wheels P7 Solid housings Normal or heavy loads Automotive wheel hubs (Ball bearings) Vibrating screens N7 Impossible Light or variable loads Conveyor rollers rope sheaves Tension pulleys M7 Heavy shockloads Traction motors Direction of load indeter-minate Normal or heavy loads...

2. Mounting 2.1 Fits and Clearances Table 3: Values of \\ Example of application \\ value (average) Press-fitting inner ring to cylindrical shaft 0.120 Withdrawing inner ring from cylindrical shaft 0.180 Press-fitting inner ring to cylindrical shaft 0.165 Press-fitting inner ring to cylindrical shaft 0.135 Press-fitting sleeve onto the area between shaft and bearing's tapered hole 0.300 Withdrawing sleeve from the area between shaft and bearing's tapered hole 0.330 Therefore, 70% to 90% of the interference appears as reduction in clearance. (Smaller reduction in clearance is adopted for bearings...

2. Mounting 2.2 Press Fitting Force and Heating Temprature for Tight Fitting A When attaching the inner ring firmly to the shaft, the force to press-fit an inner ring in the axial direction varies depending on interference and shaft diameter. However, the required force rises as surface pressure on the fitted surface and friction coefficient increase. When a stronger press fitting force is required, the inner ring is usually expanded by heating in oil before mounting, but in some cases, the ring is press-fitted using a press or similar tool while measuring the degree of interference as measured...

2. Mounting 2.3 Fitting work The inner ring is usually mounted on a shaft by means of press fitting or shrink fitting. Press fitting, however, requires a large force. The required force for press fitting can be determined by the before mentioned equation (5). During press fitting work, brinelling indentations may be caused on the raceway surfaces by rolling elements (balls or rollers) if force is applied to the outer ring. Furthermore, direct shock applied to the small ribs of the inner ring may cause the ring to crack. At the same time, no force should be applied to the cage. Therefore, exercise...

A Using this mechanism, NSK has devised a heating-type mounting/dismounting device that can be powered by an AC factory power supply with commercial frequency, and markets it for various industrial fields. Moreover, NSK has also made commercially available a bearing heater, as shown in Fig. 5, for heating a single unit, such as a small bearing. A bearing attached to a shaft cools rapidly, and after heating, an expanded bearing shrinks in a crosswise direction. In some cases, therefore, in order to avoid a clearance between the inner ring and shoulder, press the bearings firmly against the shoulder...

2. Mounting 2.4 Mounting Bearings with Tapered Bores Bearings with tapered bores are mounted in place using adapter sleeves or withdrawal sleeves, or directly on tapered shafts. The degree of fit is determined by reduction in clearance and push-in amount of the sleeves (or bearings). For spherical roller bearings, a decrease in clearance during mounting is usually measured by a clearance gauge. The reduction in the clearance and residual clearance after mounting are shown in Table 5. Spherical roller bearings with tapered bores have generally been manufactured taking into account the reduction...