Small-angle swing durability testing device for bearing
By improving the structure of the base, motor, shaft, and rocker block of the bearing testing device, the problem of swing vibration caused by the instability of the existing device structure was solved, thus achieving accuracy and stability in bearing swing durability testing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO DAER MACHINERY TECH CO LTD
- Filing Date
- 2025-05-14
- Publication Date
- 2026-05-15
AI Technical Summary
Existing bearing swing durability testing devices have poor structural stability and are prone to swing vibration, which affects the accuracy of test results.
It adopts a combination structure of base, motor, shaft, rocker block and rocker arm. Through sliding fit and lubrication design, the load influence is reduced to ensure stable swing of the bearing under test driven by the shaft. Combined with spline or polygonal shaft hole fit and lubricating oil, friction loss is reduced to achieve accurate swing test.
This improves the accuracy and stability of bearing rotation durability testing, reduces frictional loss, and ensures the reliability of test results.
Smart Images
Figure CN224247311U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bearing testing devices, and is a bearing small-angle oscillation durability testing device. Background Technology
[0002] Bearings are crucial components in modern machinery, primarily supporting rotating parts, reducing friction during movement, and ensuring rotational accuracy. After manufacturing, bearings often require performance parameter testing to determine their suitability for use. Bearing durability testing is a vital component, determining whether the bearing meets its service life under specific operating conditions. Current durability tests generally simulate actual operating conditions to obtain real-world durability data. In oscillating machinery, where the bearing primarily provides oscillation support rather than rotation, oscillation durability testing requires simulating the bearing's oscillation behavior. Existing bearing oscillation durability testing devices, such as the Chinese patent publication CN220525331U (authorization announcement date February 23, 2024), entitled "A Bearing Micro-motion Wear Testing Fixture," disclose a method using a motor to drive an eccentric wheel, which in turn drives a connecting rod to oscillate, which in turn drives a rotating shaft, causing the bearing to oscillate, thus completing the bearing oscillation durability test. However, this scheme has the drawback that the weight of the connecting rod and the swing condition have a significant load impact on the shaft. In actual testing, the overall swing condition is prone to vibration, affecting the results of the actual bearing swing durability test. Therefore, improvements to this bearing swing durability testing device are needed. Summary of the Invention
[0003] To overcome the above-mentioned shortcomings, the purpose of this utility model is to provide a bearing small-angle oscillation durability testing device in the field, thereby solving the technical problem that existing similar testing devices have poor structural stability and are prone to oscillation and vibration, which affects the test results. This objective is achieved through the following technical solution.
[0004] A bearing small-angle oscillation durability testing device includes a base and a motor. The key structural feature is that the base has mounting holes extending through both ends, with bearing holes at both ends for mounting the bearing to be tested. Each bearing hole has an inner pressure block for pressing and limiting the inner ring of the bearing and an outer pressure block for pressing and limiting the outer ring of the bearing. A rotating shaft is installed within the mounting holes, with both ends of the shaft fixedly connected to the inner pressure blocks. One end of the shaft extends out of the inner pressure block and connects to a sway block. The sway block has a rod hole, within which a slidingly fitted sway bar is installed. A motor is fixedly mounted on the top of the base, with its output end connected to a rotating wheel. The eccentric part of the rotating wheel is connected to one end of the sway bar via an eccentric shaft. When the rotating wheel rotates, it causes the sway bar to slide relative to the rod hole of the sway block, and in turn, the sway block drives the rotating shaft to oscillate. With the above structure, the rocker arm and the rocker block at the end of the shaft are in a sliding fit. When the rocker arm moves in extension and retraction relative to the rod hole, the load formed on the rocker block is small, which makes the shaft more stable when driving the bearing under test to rotate, thus improving the accuracy of the bearing rotation durability test.
[0005] The rocker block is replaced with a bushing that is closed at one end, and the bushing contains lubricating oil. This structure further lubricates the relative movement between the rocker arm and the rocker block, reduces frictional loss, and improves the accuracy of the test.
[0006] The rotating shaft has threaded sections at both ends, which are threaded to the inner pressure block. This structure facilitates the installation and operation of the inner pressure block.
[0007] The shaft and the corresponding shaft hole of the rocker block are either splined or polygonal, allowing for a movable insertion fit. This structure facilitates the installation and connection of the shaft and the rocker block, and the axial movement of the rocker block relative to the shaft further reduces the axial force on the shaft, making the bearing rotation test more accurate.
[0008] The rotating shaft has stepped shaft sections at both ends that fit into the inner ring of the bearing under test. This structure facilitates the installation and use of the bearing under test.
[0009] The end face of the rotating wheel is provided with at least two connecting holes along the radial direction, which mate with the eccentric shaft. This structure facilitates the adjustment of the swing angle of the pendulum, meeting the swing test requirements at different angles.
[0010] The end face of the rotating wheel is provided with a dovetail-shaped groove along the radial direction. A slider with sliding limit engagement is provided in the groove. The eccentric shaft and the slider are threaded together. When the eccentric shaft and the slider are threadedly locked, the eccentric shaft abuts against the groove, and the slider and the groove are locked and fixed. This structure also facilitates the adjustment of the swing angle of the swing rod, making the adjustment more convenient.
[0011] The bearing holes of the base are provided with holes on the outside that match the outer pressure block. The outer pressure block is locked and fixed to the corresponding holes by bolts. This structure is a scheme in which the outer pressure block is fixed to the base.
[0012] This utility model has a relatively simple overall structure, is easy to install and use, and provides a relatively stable, reliable and accurate bearing rotation durability test. It is suitable for use in rotation durability testing devices for various types of oscillating bearings, or for structural improvements of similar devices. Attached Figure Description
[0013] Figure 1 This is a three-dimensional structural diagram of the present invention.
[0014] Figure 2 yes Figure 1 A partial diagram of the exploded structure.
[0015] Figure 3 This is a front structural schematic diagram of the present invention, with a cross-sectional view (AA) shown in the diagram.
[0016] Figure 4 yes Figure 3 A schematic diagram of the AA cross-sectional structure.
[0017] Figure 5 This is a schematic diagram of the improved connection between the wheel and the rocker arm of this utility model.
[0018] The numbers and names in the diagram are as follows: 1. Base, 101. Bearing hole, 2. Motor, 3. Rotary wheel, 301. Slide groove, 4. Eccentric shaft, 5. Rocker arm, 6. Rocker block, 7. Inner pressure block, 8. Outer pressure block, 9. Rotary shaft, 901. Stepped shaft section, 10. Slider. Implementation
[0019] The present invention will now be further described with reference to the accompanying drawings.
[0020] like Figures 1-4As shown, the bearing small-angle swing durability testing device includes a base 1 and a motor 2. The base has mounting holes extending through both ends. Each end of the mounting holes has a bearing hole position 101 for mounting the bearing to be tested. Each bearing hole position has an inner pressure block 7 that compresses and limits the inner ring of the bearing and an outer pressure block 8 that compresses and limits the outer ring of the bearing. The outer side of the bearing hole position has a hole that matches the outer pressure block. The outer pressure block and the corresponding hole position are locked and fixed by bolts. A rotating shaft 9 is provided in the mounting hole. Both ends of the rotating shaft have stepped shaft sections 901 that fit with the inner ring of the bearing to be tested, and threaded sections that are threaded to the inner pressure blocks on both sides. One end of the rotating shaft extends out of the inner pressure block and is movably inserted into a swing block 6. The swing block is inserted by spline connection or polygonal shaft hole fit connection. The swing block has a rod hole, and a slidingly fitted swing rod 5 is provided in the rod hole. A motor is fixedly installed on the top of the base. The output end of the motor is connected to the rotating wheel 3. The eccentric part of the rotating wheel is connected to one end of the swing rod through the eccentric shaft 4. The swing rod rotates freely relative to the eccentric shaft. When the rotating wheel rotates, it drives the swing rod to form a sliding fit with the rod hole of the swing block, and drives the rotating shaft to swing in conjunction with the swing block.
[0021] Furthermore, in order to reduce sliding friction loss between the rocker block 6 and the rocker arm 5, the rocker block can also be replaced with a bushing that is closed at one end, with sliding lubricating oil inside the bushing to lubricate the relative movement between the rocker arm and the rocker block.
[0022] Furthermore, to facilitate adjustment of the swing angle of the pendulum 5 as it rotates with the wheel 3, the end face of the wheel is provided with several connecting holes evenly distributed radially to mate with the eccentric shaft 4. This allows the pendulum to be positioned at different eccentric positions on the wheel, achieving different angles of swing. In addition, such as... Figure 5 As shown, the wheel surface of the rotating wheel is provided with a dovetail-shaped groove 301 along the radial direction. The groove is provided with a sliding limit slider 10. The eccentric shaft and the slider are threaded together. When the eccentric shaft and the slider are threadedly locked, the eccentric shaft abuts against the groove, and the slider and the groove are locked and fixed. Through this structure, it is also convenient to adjust the swing angle of the swing rod.
[0023] The testing method for the bearing small-angle swing durability testing device is as follows: First, the rotating shaft 9 is placed into the mounting hole of the base 1, and the two bearings to be tested are installed at the stepped shaft sections 901 at both ends of the rotating shaft; then, the inner pressure blocks 7 on both sides are locked to the threaded sections at both ends of the rotating shaft, and the inner ring of the bearing to be tested is pressed and limited during locking; then, the outer pressure blocks 8 at both ends are respectively placed into the corresponding holes at both ends of the base, and the outer pressure blocks are fixed to the holes with bolts, and the fixed outer pressure blocks press and limit the outer ring of the bearing to be tested; next, the swing block 6 is movably inserted into one end of the rotating shaft to form a coupling, one end of the swing rod 5 is inserted into the rod hole of the swing block, and the other end of the swing rod is positioned and connected to the eccentric part of the end face of the rotating wheel 3 through the eccentric shaft 4, thus completing the installation of the device. Finally, motor 2 is turned on, and the motor drives the rotating wheel to rotate. The rotating wheel drives the swing arm to slide back and forth relative to the rod hole of the swing block, and drives the swing block to swing back and forth at a small angle. The swing block drives the rotating shaft to swing, thereby realizing the swing durability test of the bearing under test. After the test is completed, the bearing under test is removed and the corresponding wear and other parameters are tested to obtain the corresponding test results.
[0024] The above description is intended to illustrate the technical means of this utility model and is not intended to limit the technical scope of this utility model. Any obvious improvements or substitutions made to this utility model by those skilled in the art based on existing common knowledge also fall within the protection scope of the claims of this utility model.
Claims
1. A bearing small-angle oscillation durability testing device, the testing device comprising a base (1) and a motor (2), characterized in that... The base (1) is provided with mounting holes that pass through both ends. Both ends of the mounting holes are provided with bearing holes (101) for mounting the bearing to be tested. Each bearing hole is provided with an inner pressure block (7) that presses and limits the inner ring of the bearing and an outer pressure block (8) that presses and limits the outer ring of the bearing. A rotating shaft (9) is provided in the mounting hole. Both ends of the rotating shaft are fixedly connected to the inner pressure blocks at both ends. One end of the rotating shaft extends out of the inner pressure block and connects to the rocker block (6). The rocker block is provided with a rod hole. A sliding rocker rod (5) is provided in the rod hole. A motor (2) is fixedly provided on the top of the base. The output end of the motor is connected to the rotating wheel (3). The eccentric part of the rotating wheel is connected to one end of the rocker rod through an eccentric shaft (4). That is, when the rotating wheel rotates, it drives the rocker rod to slide relative to the rod hole of the rocker block and drives the rotating shaft to rotate.
2. The bearing small-angle oscillation durability testing device according to claim 1, characterized in that... The rocker block (6) is replaced by a bushing that is closed at one end, and the bushing is provided with sliding lubricating oil.
3. The bearing small-angle oscillation durability testing device according to claim 1, characterized in that... The rotating shaft (9) has threaded sections at both ends, which are threadedly connected to the inner pressure block (7).
4. The bearing small-angle oscillation durability testing device according to claim 1, characterized in that... The shaft hole corresponding to the rotating shaft (9) and the rocker block (6) is a spline fit or a polygonal shaft hole movable plug fit.
5. The bearing small-angle oscillation durability testing device according to claim 1, characterized in that... The two ends of the rotating shaft (9) are provided with stepped shaft sections (901) that are matched with the inner ring limit of the bearing to be tested.
6. The bearing small-angle oscillation durability testing device according to claim 1, characterized in that... The end face of the wheel (3) is provided with at least two connecting holes that mate with the eccentric shaft (4) in the radial direction.
7. The bearing small-angle oscillation durability testing device according to claim 1, characterized in that... The end face of the rotating wheel (3) is provided with a dovetail-shaped groove (301) in the radial direction. The groove is provided with a sliding block (10) with sliding limit fit. The eccentric shaft (4) and the slider are threadedly fitted. When the eccentric shaft and the slider are threadedly locked, the eccentric shaft abuts against the groove, and the slider and the groove are locked and fixed.
8. The bearing small-angle oscillation durability testing device according to claim 1, characterized in that... The bearing hole (101) of the base (1) is provided with a hole that matches the outer pressure block (8) on the outside. The outer pressure block and the corresponding hole are locked and fixed by bolts.