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About the preload method: the positioning preload is the relative position of the opposite SKF imported bearing in the axial direction, which will not change during use. Here can be an example:
(1) A method of tightening a combined bearing whose width difference or axial clearance has been adjusted in advance for preloading.
(2) Use adjusted size gaskets and shims to give the bearing preload.
(3) The method used after tightening the screw and nut that can adjust the axial clearance. In this case, in order to obtain an appropriate amount of preload, it is necessary to measure the starting friction torque and adjust it.
The so-called constant pressure preload is a method that uses coil springs and disc springs to give the bearings an appropriate preload. In use, even if the relative position of the bearing changes, preload method. In use, even if the relative position that will go out changes, the preload can be roughly kept constant.
The preload line diagram of SKF imported bearings after constant pressure preload. The rigidity of the preload spring is usually very small compared with the rigidity of the bearing. Therefore, the spring displacement line is approximately parallel to the horizontal axis. Therefore, the constant pressure preload The rigidity of the loaded single bearing is approximately equal to the rigidity of the single bearing that has been preloaded with an axial load. Comparison of rigidity of imported SKF bearings and bearing monomers after positioning preload and constant pressure preload.
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Each time the Perseverance Mars Rover collects or handles rock and regolith samples in Jezero Crater during its multiple-year mission on the surface of the red planet, key components from Kaydon/SKF will facilitate that those activities successfully take place.Enabling the Mars Rover’s core operations in the harsh environment on Mars are Kaydon Reali-Slim thin-section ball bearings, designed and manufactured by Kaydon/SKF at the company’s global thin-section bearing engineering center in Muskegon, and its recently expanded manufacturing hub in Sumter, USA.
These highly engineered components contribute to the survival of the rover’s main robotic arm, sample collecting turret, tool bit carousel and sample handling assembly during a months-long trip through space, and its function as intended on the Mars surface. SKF also supplied critical bearings for the mission’s launch vehicle which carried the rover and its lander into space.
The bearings will play an integral role in the vital process of sample collection on Mars. When the rover is ready to begin collecting samples on the surface, the robotic arm will maneuver into place and the tool bit carousel will whirr into action, deploying tools to drill or abrade material, which will then be collected by the sample collecting turret (aka “the hand”) and transferred to the sample handling assembly for processing onboard the rover, and eventually a potential return to Earth for analysis via a future Mars mission.
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