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Dimensional Control and Preload Adjustment Requirements of Cross Roller Bearings Shrink Packing

Cross roller bearings are commonly used in machine tools, robots, and other high-precision applications. To ensure their performance, it is crucial to control the dimensions and preload adjustment during shrink packing. In this article, we will explore several requirements for dimensional control and preload adjustment of cross roller bearings shrink packing.

Dimensional Control of Components

Cross roller bearings
  1. Dimensional control is crucial in the shrink packing process of cross roller bearings. Any dimensional error can lead to inaccurate preload adjustment or even failure of the bearing.
  2. Therefore, the components’ dimensions, including the inner and outer rings, rollers, spacers, and retainers, must be strictly controlled within the allowable tolerances. The use of high-precision CNC machines and strict inspection techniques can ensure the dimensional accuracy of the components.

Preload Adjustment Requirements for Cross Roller Bearings

  1. Preload adjustment is an essential parameter that affects the performance of cross roller bearings. It refers to the application of an axial load to the bearing, which eliminates the internal clearance and ensures adequate contact between the rolling elements and the raceways.
  2. The application of preloading allows the bearings to operate at higher speeds, have higher accuracy and rigidity, and handle heavier loads, amongst other benefits.
  3. The preload adjustment must be carried out according to the manufacturer’s instructions, which consider the assembly of the components, the intended use, and the type of bearing. Improper preload adjustment can cause excessive stress on the bearing or even damage.

Use of Specialized Shrink Packing Machines

  1. Shrink packing of cross roller bearings requires specialized machines that can control the temperature and pressure during the process.
  2. The use of specialized machines ensures uniform heating and cooling of the components, preventing distortion, cracking, or deformation caused by uneven heating.
  3. The machines should also be equipped with controls that allow the operator to adjust the temperature, time, and pressure to meet the specific requirements of the bearing.

Proper Assembly of Components

  1. The proper assembly of components is necessary for the shrink packing of cross roller bearings. The components must be clean and free from debris to prevent contamination of the bearing.
  2. The components should be assembled in the correct sequence to ensure the correct orientation and alignment. The preloaded bearings should be handled with care to prevent damage to the rolling elements and the raceways.

Post-Packaging Inspection

After the shrink packing process, the bearings should undergo a thorough inspection to ensure their performance and longevity. The inspection should include dimensional measurements, visual inspection, and verification of the preload. Any deviation from the required specifications should be corrected immediately.


Dimensional control and preload adjustment are crucial requirements in the shrink packing of cross roller bearings. The use of specialized machines, strict quality control techniques, and proper assembly of components can ensure the dimensional accuracy and preload adjustment of the bearing. The post-packaging inspection ensures the bearing’s performance and longevity, ultimately leading to reliable and efficient operation in high-precision applications.

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