Disassembly method of tandem thrust cylindrical roller bearings

As an important component in mechanical equipment, the disassembly process of tandem thrust cylindrical roller bearings requires meticulous and professional operations to ensure the integrity of the bearings and subsequent reusability. Today, the editor will introduce in detail the disassembly steps, tools and precautions of tandem thrust cylindrical roller bearings to help you fully understand and correctly perform the disassembly operation.

Preparation

1. Safety protection

Before any disassembly work, the first task is to ensure the safety of the operating environment. Wear personal protective equipment such as protective clothing, gloves, goggles, and lay protective blankets in the work area to prevent metal fragments from splashing and causing injuries.

2. Tool preparation

According to the size and type of the bearing, prepare the corresponding disassembly tools, including but not limited to:

Puller: mechanical puller (two-claw or three-claw), hydraulic puller.

Heating tools: heating ring, adjustable induction heater.

Auxiliary tools: screwdriver, wrench, hammer, hydraulic device, jack, height gauge, sling, etc.

3. Drawing study

Carefully study the bearing drawings, understand the bearing structure, matching method and disassembly sequence, and ensure that the disassembly process is foolproof.

  

Disassembly steps

1. Preliminary inspection

Before disassembly, first inspect the bearing visually, record its status, confirm the amount of remaining lubricant, and sample the lubricant.

2. Disassembly of the outer ring

For the outer ring with interference fit, if there is an extrusion screw hole on the bearing housing, you can use the screw to tighten the screw evenly while disassembling the outer ring. If there is no such design, you may need to use a press or tap it gently.

3. Disassembly of the inner ring

3.1 Cold disassembly

For small bearings, you can use a suitable punch to gently tap the side of the bearing ring, or use a mechanical puller for disassembly. The puller's grip should act on the inner ring or adjacent components to ensure correct force transmission.

For large and medium-sized bearings, due to the large force required, it is recommended to use a hydraulic power tool or oil injection method. In the case of oil holes and oil grooves designed on the shaft, the bearing is separated from the shaft diameter by oil pressure.

3.2 Thermal disassembly

For the inner ring of needle roller bearings or NU, NJ, NUP cylindrical roller bearings, thermal disassembly is suitable. Use a heating ring or an adjustable induction heater to heat the inner ring of the bearing so that it can be easily disassembled after expansion. The heating temperature should be controlled within a reasonable range to avoid damage to the bearing.

4. Post-disassembly treatment

After the bearing is removed, it should be cleaned immediately. Cleaning is divided into two stages: rough cleaning and fine cleaning. During rough cleaning, a brush can be used to remove grease or adhesives in the oil, while fine cleaning needs to be carried out in a cleaner environment. After cleaning, anti-rust oil or anti-rust grease should be applied to the bearing immediately to prevent rust.

3. Precautions

Avoid hitting the rolling element: Under no circumstances should the bearing ring, cage, rolling element or seal be hit directly to avoid damaging the bearing.

Apply force properly: The force applied during disassembly should not be transmitted from one bearing ring to another through the rolling element to avoid damage to the raceway.

Tool selection: Select appropriate disassembly tools according to the type, size and fit of the bearing to ensure a smooth disassembly process.

Record and check: During the disassembly process, the bearing status and disassembly process should be recorded in detail for reference during subsequent installation and maintenance.

The disassembly of tandem thrust cylindrical roller bearings is a complex and delicate task that requires the operator to have rich professional knowledge and practical experience. The integrity and subsequent reusability of the bearing can be ensured through reasonable preparation, correct operating steps and strict precautions.