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THK NRS25

Type 90 ° contact design USES NR results difference from 45 ° contact stiffness design. Type in the radial load P, radial deflection is 44% NR less than 45 ° contact type.

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THK NRS25

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Characteristics of Types NR and NRS

Rigidity Up 200% Against Main Loads

Type 90 ° contact design USES NR results difference from 45 ° contact stiffness design. Type in the radial load P, radial deflection is 44% NR less than 45 ° contact type.


Rigidity Up 200% Against Lateral and Reverse-Radial Loads

Since the distance H of the bottom trough ball (subject to lateral loads) of the bottom surface of the LM guide rail is shorter in the LM guide rail NR, the ratio of the LMrail width W to H is smaller. In addition, the distance T from the lm-track mounting bolt mount to the bottom surface of the track is very short. Therefore, under lateral loads, the LM rail can only withstand limited deflection, which enables the rail to maintain high rigidity against such loads. In addition, as the length of B decreases and the thickness of A increases, the strength of the LM module can be increased, which can resist the radial and transverse reverse loads, thus turning on the module. Therefore, 90 ° contact design improves the rigidity of reverse - radial load. Compared with the traditional equivalent model produced by THK, the model has smaller spheres and the effective number of balls is about 1.3 times, thus increasing the static stiffness.


Comparison of Contact Surface and Internal Stress among Different Contact Designs

The contact area and internal stress of the ball vary greatly with the shape of the contact surface. The actual contact surface will not be as large as it looks, as the retainer holds the roller and reduces its effective length. In addition, the installation error affects the stress distribution around the contact area and has a significant impact on the differential slip.


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