tailieunhanh - Handbook of Shaft Alignment Part 5

Tham khảo tài liệu 'handbook of shaft alignment part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 170 Shaft Alignment Handbook Third Edition TABLE Guidelines for Shrink Fits on Shafts Shaft Diameter in. Interference Fit in. 1 2 to 2 2 to 6 6 and up to in. to in. to inches per inch of shaft diameter The removal of the coupling hub is accomplished by pulling the hub off the shaft with an acceptable puller mechanism and at times cooling the shaft with a dry ice pack. Shrink fit coupling hubs should always have fine threaded puller holes preferably four in the end of the coupling as shown in Figure . Bearing-type pullers that push the hub off from the backside are not recommended as there is a great possibility that the puller can twist or pitch slightly preventing a straight axial draw on the hub. For larger shaft diameters with tight interference fits it may be necessary to apply gentle heating to the coupling for removal. Splined Shaft with End Lock Nut or Locking Plate A splined shaft and coupling arrangement is shown in Figure . There should be a slight interference fit in. to prevent backlash or rocking of the hub on the shaft. Tapered Bore Interference Fit with Keyways Tapered shaft ends are generally used where high torques and speeds are experienced on rotating machinery necessitating a tight coupling hub to shaft fit up. The shaft end is tapered to provide an easier job of removing the coupling hub. The degree of taper on a shaft end is usually expressed in terms of its slope inches per foot . The amount of interference fit is expressed in inches per inch of shaft diameter. The general rule for interference fits for this type of shaft arrangement is 1 mil per inch of shaft diameter. The distance a coupling hub must travel axially along a shaft past the point where the hub is just touching the shaft at ambient temperatures is found in the following equation Key Shaftj B Compare A to B and C to D k D J FIGURE Measuring the shaft and coupling hub for proper fits. Flexible and .