How to remove a bearing on a shaft

1. Removing the bearing installed on the cylindrical shaft diameter

(1) Cold disassembly

Lei Duxian⌒Ellipse It is guaranteed that the bearing ring can be removed from the shaft by lightly tapping the side of the bearing ring with a suitable punch, preferably with a mechanical puller (fig. 1). The pull should act on the inner ring or adjacent components. Removal can be simplified if the shaft shoulder and housing shoulder have grooves to accommodate the puller grip. Also, machine some threaded holes at the shoulders of the holes so that the bolts can push the bearings out (fig. 2).

The forces required for medium and large bearings are often greater than what a machine tool can provide. Therefore, the raccoon raccoon power tool or oil injection method, or both are used together. This means that the shaft needs to be designed with oil holes and oil grooves (Figure 3).

(2) Hot disassembly

When disassembling the inner ring of needle roller bearings or NU, NJ, and NUP cylindrical roller bearings, Suitable for use with hot disassembly methods. Two commonly used heating tools: heating rings and adjustable induction heaters.

Heating rings are typically used to install and remove inner rings of small and medium-sized bearings of the same size. Heating ring made of light alloy. The heating ring is radially slotted and equipped with an electrically insulating handle (Figure 4).

If the inner rings of different diameters are often disassembled, it is recommended to use a debuggable induction heater. These heaters (Figure 5) quickly heat the inner ring without heating the shaft. When disassembling the inner ring of a large cylindrical roller bearing, some special stationary induction heaters can be used.

2. Removing the bearing mounted on the conical shaft diameter

You can use a mechanical or hydraulic puller to pull the inner ring, Small bearings can be removed. Some pullers are equipped with spring-operated arms, and the use of such pullers with self-centering 4 simplifies the procedure and avoids damage to the journal. If it is not possible to use the puller claws on the inner ring, the bearing should be disassembled through the outer ring, or by a puller combined with a puller tab (fig. 6).

The disassembly of medium and large bearings is safer and easier when using the oil injection method. This method injects hydraulic oil between two conical mating surfaces under high pressure through oil holes and oil grooves. The friction between the two surfaces is drastically reduced and an axial force is created that separates the bearing and shaft diameter.

3 Removing the bearing on the adapter sleeve

For small bearings mounted on a stepped shaft of an adapter sleeve, a end face to remove (Figure 8). Before doing so, it is necessary to loosen the adapter sleeve lock nut several turns.

For the school, the use of hydraulic nuts can make bearing disassembly easier. To do this, a suitable stop must be installed in close proximity to the hydraulic nut piston (fig. 9). Oil injection is the easier method, but an adapter sleeve with oil holes and grooves must be used.

3. Removing the bearing on the withdrawal sleeve

When removing the bearing on the withdrawal sleeve, the locking device must be removed. (such as lock nut, end plate, etc.)

For small and medium-sized bearings, a lock nut, a hook wrench or an impact wrench can be used for disassembly (Figure 10).

For medium and large bearings mounted on the withdrawal sleeve, it can be easily dismantled with a hydraulic nut. It is recommended to install a stop behind the hydraulic nut on the shaft end (Figure 11). The stop device can prevent the withdrawal sleeve and the hydraulic nut from flying out of the shaft when the withdrawal sleeve is suddenly separated from the mating position.