A fatigue test fixture for segmented cages of roller bearings

By designing a fatigue testing fixture for segmented cages of roller bearings, and using a connecting frame and sleeve rod structure to simulate composite stress, the problem that existing testing fixtures cannot simulate actual working conditions is solved, and a more accurate fatigue performance assessment is achieved.

CN224518146UActive Publication Date: 2026-07-17BEIJING LONG XUAN RUBBER & PLASTIC CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
BEIJING LONG XUAN RUBBER & PLASTIC CO LTD
Filing Date
2025-07-29
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing fatigue testing fixtures cannot simulate the combined stress state of roller cages under actual working conditions, resulting in discrepancies between test results and actual failure mechanisms.

Method used

Design a fatigue testing fixture for segmented cages of roller bearings. The fixture is connected to the rollers via a connecting frame and a through rod. It uses an interlocking connecting rod structure to simulate the small angular deflection and slight torsion of the cage, thereby achieving fatigue testing under combined stress conditions.

Benefits of technology

This improved the accuracy of fatigue testing, making the test results more consistent with actual failure mechanisms and enhancing the accuracy of cage durability assessment.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a kind of fatigue test tool for segmented retainer of roller bearing, including connecting frame and two respectively installed in the retainer both ends installation port position's roller, and the through hole is opened in the radial on roller, and the through rod on connecting frame is worn on roller, and two connecting frames are connected with fatigue testing machine respectively by connecting rod;Connecting rod includes the first bar and the second bar of mutual sleeve connection, and the outside of first bar is symmetrically provided with spiral groove, and the inner wall of second bar is fixedly installed with the slider matched with spiral groove.Sliding block in the second bar is slid along the spiral groove of the outside of first bar to drive retainer torsion when fatigue testing machine loads, to simulate the slight angular deflection and slight torsion in actual working condition of retainer, realize fatigue test under composite stress state.
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Claims

1. A fatigue testing fixture for a segmented cage of a roller bearing, characterized in that, The device includes a connecting frame and rollers that mate with a cage. Two rollers are respectively installed at the mounting openings at both ends of the cage. The rollers have radially through holes. The connecting frame passes through the rollers at the ends of the cage via through rods. Both connecting frames are connected to a fatigue testing machine via connecting rods. The connecting rods include a first rod and a second rod that are nested together. The outer side of the first rod has symmetrically formed helical grooves, and the inner wall of the second rod has a slider that mates with the helical grooves.

2. A fatigue test fixture for segmented retainers of roller bearing segments as defined in claim 1, wherein, The connecting frame is a U-shaped structure, including two symmetrically arranged connecting lugs, and the two connecting lugs are coaxially provided with through holes for the through rod to pass through.

3. A fatigue test fixture for segmented retainers of roller bearing segments as defined in claim 2, wherein, The connecting frame includes a connecting plate, which is connected to the fatigue testing machine via a connecting rod. The connecting plate has symmetrical adjustment holes on both sides of the connecting rod, and a connecting lug is slidably installed in the adjustment holes on the connecting plate.

4. A fatigue test fixture for segmented retainers of roller bearing segments as set forth in claim 3, characterized in that, The connecting rod has a radially formed connecting hole at one end away from the connecting plate for connecting with a pin of a fatigue testing machine.

5. A fatigue test fixture for segmented retainers of roller bearing segments as defined in claim 3 wherein, An adjusting plate is fixedly installed at one end of the connecting ear plate through the connecting plate. The adjusting plate has a through hole, and the connecting plate has a waist-shaped hole corresponding to the through hole. A locking bolt passing through the through hole of the adjusting plate is installed in the waist-shaped hole, and a locking nut is fitted on the locking bolt.

6. A fatigue test fixture for segmented retainers of roller bearing segments as defined in claim 5 wherein, The contact surface between the adjusting plate and the connecting plate is provided with anti-slip texture.

7. A fatigue test fixture for segmented retainers of roller bearing segments as defined in claim 1 wherein, The diameter of the radial through hole of the roller is the same as the diameter of the through rod.

8. The fatigue testing fixture for a segmented cage of a roller bearing according to claim 1, characterized in that, Both the spiral groove and the slider have semi-circular cross-sections.

9. The fatigue testing fixture for a segmented cage of a roller bearing according to claim 1, characterized in that, The inner wall of the radial through hole of the roller is provided with a damping layer.

10. A fatigue test fixture for segmented retainers of roller bearing segments as defined in claim 9, wherein, The damping layer is a rubber material layer.