Thin wall bearing stiffness measuring device

Abstract

The utility model discloses a kind of thin-wall bearing rigidity measuring devices, including base, the base is provided with the positioning seat for installing the bearing to be measured, the base is also provided with mounting bracket and support frame, the positioning seat is arranged between mounting bracket and support frame, displacement sensor for being arranged on the mounting bracket and being used to resist on the outer ring end surface of the bearing to be measured, loading rod is swinged and set on the support frame, the loading rod one end is provided with the slot for being clamped on the outer ring of the bearing to be measured, and the other end is provided with the load connected with, its simple structure can be conveniently measured to the angular rigidity of thin-wall bearing, with good use effect.

Description

Technical Field

[0001] This utility model relates to a device for measuring the stiffness of thin-walled bearings. Background Technology

[0002] As the high-end equipment manufacturing industry upgrades towards precision and intelligence, bearings, as core transmission components, face increasingly stringent performance requirements, driving the synchronous iteration and innovation of bearing testing instruments. From traditional dimensional testing to comprehensive performance evaluation, instrument functions are constantly expanding. However, in specialized testing areas for bearings under special operating conditions, such as special project inspection tools, the limited application scenarios, high technical barriers, and the scarcity of readily available design specifications and performance parameters within the industry have become a bottleneck restricting the quality control of special bearings. Stiffness, as a core indicator for measuring the deformation capacity of bearings under load, directly affects the operational accuracy and stability of equipment. Especially in critical areas such as precision machine tool spindles and aero-engines, bearings with extremely small clearance requirements are prone to vibration and abnormal noise if their stiffness is insufficient, significantly shortening their service life. Thin-walled bearings, as special products meeting the demands of lightweighting and compactness, present far greater testing challenges than conventional bearings: the extreme ratio of wall thickness to diameter makes them prone to elastic deformation during clamping, the narrow support surface leads to poor positioning stability, and even small force deviations or directional shifts during loading can introduce significant measurement errors. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a thin-walled bearing stiffness measuring device. It has a simple structure, can stably and conveniently measure the angular stiffness of thin-walled bearings, and has good performance.

[0004] To achieve the above objectives, this utility model provides a thin-walled bearing stiffness measuring device, including a base, a positioning seat for mounting the bearing to be tested on the base, a mounting frame and a support frame on the base, the positioning seat being disposed between the mounting frame and the support frame, a displacement sensor for abutting against the outer ring end face of the bearing to be tested on the mounting frame, and a loading rod oscillating on the support frame, one end of the loading rod having a clamping groove for clamping onto the outer ring of the bearing to be tested, and the other end being connected to a load.

[0005] The advantages of this design are as follows: the positioning seat, placed between the mounting bracket and the support bracket, provides a stable support reference for the bearing under test, avoiding bearing misalignment caused by unilateral force and reducing systematic errors introduced by clamping; the loading rod adopts a swing-type design, and its clamping groove fits snugly with the bearing outer ring, which can evenly transfer the load to the outer ring, and the direction of force application is closer to the actual stress state of the bearing during operation, avoiding local stress concentration caused by rigid loading and preventing non-detectable deformation of the thin-walled outer ring during testing. The displacement sensor's design, which directly contacts the outer ring end face, can capture minute displacement changes in real time during the load increase process. Once the data fluctuates, the critical point of structural deformation can be accurately determined. Combined with the load value, the rigidity parameters of the outer ring can be quickly obtained, realizing synchronous linkage detection of force and displacement, which greatly improves measurement accuracy and response speed. The swing structure of the loading rod and the open design of the clamping groove can be adapted to thin-walled bearings of different diameters. By adjusting the clamping depth of the clamping groove, multi-specification compatibility can be achieved, improving the versatility of the device. The load connection end can be adapted to weights, hydraulic or electric loading components to meet the detection needs of different load gradients and adapt to multiple application scenarios from laboratory research and development to batch testing on the production line.

[0006] As a further feature of this invention, the load is connected to the loading rod via a flexible connecting line, and a loading frame is provided on one side of the support frame on the base. A guide wheel is rotatably mounted on the loading frame, and a guide groove is provided on the outer peripheral wall of the guide wheel for the flexible connecting line to pass through for reversal.

[0007] The advantages of this design are as follows: The flexible connecting line combines flexibility with tensile stability. When testing the upper surface of the bearing outer ring, the load can be applied directly and naturally downwards without the need for additional reversing components. When testing the lower surface, precise reversal is achieved through the guide groove of the guide wheel on the loading frame. The rotation of the guide wheel reduces frictional resistance, ensuring a smooth change in load direction. Bidirectional testing can be completed without disassembling and reassembling the device. The arc design of the guide groove prevents the flexible line from shifting or wearing, extending the service life of the components. The flexible connection can buffer the instantaneous impact force when the load is applied, reducing accidental damage to the thin-walled outer ring.

[0008] As a further feature of this invention, the positioning seat is provided with a positioning step for fitting with the inner hole of the bearing to be tested, and a positioning baffle is also provided on the positioning platform. A clamping groove for positioning the outer ring of the bearing to be tested is formed between the bottom surface of the positioning step and the positioning baffle.

[0009] The advantages of this design are as follows: The precise fit between the positioning step and the bearing's inner bore allows for rapid radial centering of the bearing, preventing uneven stress caused by radial misalignment during testing. Furthermore, the groove formed by the bottom surface of the positioning step and the positioning baffle firmly clamps the bearing's outer ring, effectively limiting its axial movement. This dual-positioning structure is particularly suitable for the easily deformable characteristics of thin-walled bearings, reducing pressure damage to the bearing body during clamping and ensuring that the bearing remains in the preset testing position during loading testing, significantly reducing measurement errors caused by positioning deviations.

[0010] As a further feature of this utility model, the positioning seat is provided with a positioning hole at its center, and a positioning screw is threaded into the positioning hole. The head of the positioning screw abuts against the positioning baffle to limit the disengagement of the positioning baffle.

[0011] The advantages of this design are as follows: The threaded fit between the positioning hole and the positioning screw allows for precise adjustment of the clamping force on the positioning baffle by rotating the screw, effectively accommodating thin-walled bearings of varying thicknesses. Adjustment avoids both excessive pressure that could deform the bearing outer ring and insufficient pressure that could cause the baffle to loosen, ensuring the bearing remains stably positioned during testing. The threaded adjustment method is intuitive and highly controllable, facilitating flexible adjustment of clamping tightness according to actual testing needs and improving operational convenience. Simultaneously, the reliable contact and limiting effect of the screw head on the positioning baffle prevents it from dislodging from its position under load during testing, further ensuring positioning stability and the accuracy of measurement data.

[0012] As a further feature of this utility model, the positioning baffle is provided with a slot, which is inserted into the positioning screw rod.

[0013] The advantages of this design are as follows: The slot on the positioning baffle and the insert-fit design of the positioning screw shank fundamentally simplify the assembly process. During assembly, there is no need for precise alignment of the baffle hole with the screw head; simply pushing the slot along the axial direction of the screw shank completes the initial positioning, significantly reducing the difficulty of alignment during assembly. This is especially suitable for rapid operation by workers in batch assembly scenarios, effectively shortening the overall assembly time of the device. This structure avoids the cumbersome steps of completely unscrewing the screw to install or remove the baffle in traditional through-hole assembly. For subsequent maintenance or bearing replacement, there is no need to remove the positioning screw; simply pull the baffle out along the slot, significantly improving operational convenience. Furthermore, the close fit between the slot and the shank also helps restrict the circumferential rotation of the baffle, ensuring the stability of the baffle position after assembly, further improving the reliability of the positioning structure. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0015] Figure 2 This is a cross-sectional structural diagram of an embodiment of the present utility model. Detailed Implementation

[0016] This utility model provides an embodiment of a thin-walled bearing stiffness measuring device, such as... Figures 1 to 2 As shown, the device includes a base 1, on which a positioning seat 3 for mounting the bearing to be tested is provided. The base 1 also includes a mounting frame 2 and a support frame 4. The positioning seat 3 is positioned between the mounting frame 2 and the support frame 4. The mounting frame 2 is equipped with a displacement sensor 21 for contacting the outer ring end face of the bearing to be tested. A loading rod 41 is oscillatingly mounted on the support frame 4. One end of the loading rod 41 has a clamping groove 42 for clamping onto the outer ring of the bearing to be tested, and the other end is connected to a load 52. The advantages of this configuration are: the positioning seat 3, positioned between the mounting frame 2 and the support frame 4, provides a stable support reference for the bearing to be tested, avoiding bearing misalignment due to unilateral force and reducing system errors introduced by clamping; the oscillating design of the loading rod 41, with its clamping groove 42 closely fitting the outer ring of the bearing, allows the load 52 to be evenly transferred to the outer ring, with the force direction more closely resembling the actual stress state of the bearing during operation, avoiding local stress concentration caused by rigid loading and preventing non-detectable deformation of the thin-walled outer ring during testing. The displacement sensor 21, designed to directly contact the outer ring end face, can capture minute displacement changes in real time as the load 52 increases. Once the data fluctuates, it accurately determines the critical point of structural deformation. Combined with the load 52 value, the outer ring rigidity parameters can be quickly derived, achieving synchronous force-displacement detection and significantly improving measurement accuracy and response speed. The swing structure of the loading rod 41 and the open design of the clamping groove 42 can accommodate thin-walled bearings of different diameters. Adjusting the clamping depth of the clamping groove 42 achieves multi-specification compatibility, enhancing the device's versatility. The load 52 connection end can be adapted to weights, hydraulic or electric loading components to meet the detection needs of different load gradients, making it suitable for various applications from laboratory R&D to production line batch testing.

[0017] As a further feature of this embodiment, the load 52 is connected to the loading rod 41 via a flexible connecting line. A loading frame 5 is provided on one side of the support frame 4 on the base 1. A guide wheel 51 is rotatably mounted on the loading frame 5. A guide groove is provided on the outer peripheral wall of the guide wheel 51 for the flexible connecting line to pass through for reversal. The beneficial effects of this configuration are: with this configuration, the flexible connecting line has both flexibility and tensile stability. When testing the upper end face of the bearing outer ring, the load 52 can be applied directly and naturally without the need for additional reversal components. When testing the lower end face, the guide groove of the guide wheel 51 on the loading frame 5 precisely limits the reversal, and the rotation of the guide wheel 51 reduces frictional resistance, ensuring a smooth change in the direction of the load 52. Bidirectional testing can be completed without disassembling and reassembling the device. The arc design of the guide groove can prevent the flexible line from shifting or wearing, extending the service life of the component. The flexible connection can buffer the instantaneous impact force when the load 52 is applied, reducing accidental damage to the thin-walled outer ring.

[0018] As a further feature of this embodiment, the positioning seat 3 is provided with a positioning step 31 for engaging with the inner bore of the bearing to be tested. A positioning baffle 32 is also provided on the positioning platform. A clamping groove 42 for positioning the outer ring of the bearing to be tested is formed between the bottom surface of the positioning step 31 and the positioning baffle 32. The advantages of this configuration are: the precise engagement of the positioning step 31 with the bearing's inner bore allows for rapid radial centering of the bearing, preventing uneven force distribution caused by radial offset during testing; and the clamping groove 42 formed by the bottom surface of the positioning step 31 and the positioning baffle 32 firmly clamps the outer ring of the bearing, effectively limiting its axial movement. This dual positioning structure is particularly suitable for the easily deformable characteristics of thin-walled bearings, reducing pressure damage to the bearing body during clamping, while ensuring that the bearing is always in the preset testing position during loading testing, significantly reducing measurement errors introduced by positioning deviations.

[0019] As a further feature of this embodiment, the positioning seat 3 has a positioning hole at its center, and a positioning screw 33 is threaded into the positioning hole. The head of the positioning screw 33 abuts against the positioning baffle 32, thus limiting the disengagement of the positioning baffle 32. The advantages of this design are: the threaded fit between the positioning hole and the positioning screw 33 allows for precise adjustment of the clamping force on the positioning baffle 32 by rotating the screw, effectively adapting to thin-walled bearings of different wall thicknesses. During adjustment, it avoids both excessive pressure causing deformation of the bearing outer ring and insufficient pressure causing the baffle to loosen, ensuring the bearing remains in a stable positioning state during testing. The threaded adjustment method is intuitive and highly controllable, facilitating flexible adjustment of the clamping tightness according to actual testing needs and improving operational convenience. Simultaneously, the screw head's abutment against the positioning baffle 32 provides reliable limiting, preventing the baffle from disengaging from its positioning position due to the load 52 during testing, further ensuring positioning stability and the accuracy of measurement data.

[0020] As a further feature of this embodiment, the positioning baffle 32 has a slot 321, which engages with the shank of the positioning screw 33. The advantages of this design are: the engagement between the slot 321 on the positioning baffle 32 and the shank of the positioning screw 33 fundamentally simplifies the assembly process. During assembly, there is no need for precise alignment of the baffle hole and the screw head; simply pushing the slot 321 axially along the screw shank completes the initial positioning, significantly reducing the alignment difficulty during assembly. This is particularly suitable for rapid operation by workers in batch assembly scenarios, effectively shortening the overall assembly time of the device. This structure avoids the cumbersome steps of completely unscrewing the screw to install or remove the baffle in traditional through-hole assembly. For subsequent maintenance or bearing replacement, there is no need to disassemble the positioning screw 33; the baffle can be directly pulled out along the slot 321, significantly improving operational convenience. Furthermore, the close engagement between the slot 321 and the shank also helps restrict the circumferential rotation of the baffle, ensuring the stability of the baffle position after assembly, further improving the reliability of the positioning structure.

[0021] The above examples are merely one preferred embodiment of this utility model. Ordinary variations and substitutions made by those skilled in the art within the scope of this utility model's technical solution are all included within the protection scope of this utility model.

Claims

1. A thin-walled bearing stiffness measuring device, comprising a base, wherein a positioning seat for mounting the bearing to be measured is provided on the base, characterized in that: The base is also provided with a mounting frame and a support frame. The positioning seat is located between the mounting frame and the support frame. The mounting frame is provided with a displacement sensor for contacting the outer ring end face of the bearing to be tested. The support frame is provided with a swaying loading rod. One end of the loading rod is provided with a clamping groove for clamping on the outer ring of the bearing to be tested, and the other end is provided with a load.

2. The thin-walled bearing stiffness measuring device according to claim 1, characterized in that: The load is connected to the loading rod via a flexible connecting line. A loading frame is provided on one side of the support frame on the base. A guide wheel is rotatably mounted on the loading frame. A guide groove is provided on the outer peripheral wall of the guide wheel for the flexible connecting line to pass through for reversal.

3. The thin-walled bearing stiffness measuring device according to claim 1, characterized in that: The positioning seat is provided with a positioning step for fitting with the inner hole of the bearing to be tested. The positioning platform is also provided with a positioning baffle. A clamping groove for positioning the outer ring of the bearing to be tested is formed between the bottom surface of the positioning step and the positioning baffle.

4. The thin-walled bearing stiffness measuring device according to claim 3, characterized in that: The positioning seat has a positioning hole at its center, and a positioning screw is threaded into the positioning hole. The head of the positioning screw abuts against the positioning baffle to limit the disengagement of the positioning baffle.

5. The thin-walled bearing stiffness measuring device according to claim 4, characterized in that: The positioning baffle has a slot, which is inserted into the positioning screw rod.

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