Bidirectional loading slewing device for bearing test
By designing a bidirectional loading rotary device for bearing testing, the problems of poor coaxiality and uneven loading in existing devices are solved, realizing high coaxiality and low cost bearing performance testing, which is suitable for test bench systems of traditional and magnetic thrust bearings.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI JUNZHUO IND CO LTD
- Filing Date
- 2025-07-25
- Publication Date
- 2026-05-19
AI Technical Summary
Existing thrust bearing performance testing equipment suffers from problems such as poor coaxiality, uneven loading, jamming, and wear when subjected to bidirectional axial loads, and cannot realistically simulate the actual stress conditions of the bearing.
A bidirectional loading rotary device was designed, including a bearing assembly, a central shaft, an end plate, and a bushing. The bearing balls are clamped by a first seat ring, a shaft ring, and a second seat ring. Combined with a fixing block and a set bolt, the coaxiality and stability of the bearing assembly are ensured, and smooth rotation is achieved.
It improves the coaxiality of the bearing testing device, ensures smooth load loading, reduces wear, extends service life, and lowers operating and maintenance costs.
Smart Images
Figure CN224262813U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bearing testing technology, and in particular to a bidirectional loading and rotating device for bearing testing. Background Technology
[0002] Thrust bearings (including traditional mechanical thrust bearings and new magnetic thrust bearings) are key components in various transmission systems, and their performance directly affects the reliability, efficiency, and lifespan of the entire system. With the development of industrial technology, the operating conditions faced by thrust bearings are becoming increasingly demanding (such as high loads, high speeds, and extreme temperatures). Therefore, rigorous performance testing before bearing installation is essential to verify whether their design, materials, and manufacturing processes meet the expected requirements, and is crucial for optimizing product performance and ensuring safe system operation.
[0003] In existing technologies, performance testing of thrust bearings, especially in cases requiring bidirectional axial load loading, primarily relies on specific loading devices. However, existing loading devices often suffer from poor coaxiality with the bearing housing under test, and internal movement within the loading device is prone to occur. This frequently leads to difficulties in bidirectional load loading, resulting in problems such as jamming, instability, abnormally increased friction, and easy wear of the loading device. Moreover, this approach cannot realistically and smoothly simulate the actual bidirectional stress conditions of the bearing under test. Therefore, to improve the coaxiality between the loading device and the bearing housing under test, it is necessary to increase the precision requirements of the device and the skill level of the operators.
[0004] In conclusion, designing a bidirectional loading and rotating device that is structurally sound, easy to use, low in cost, and effectively overcomes the shortcomings of existing technologies is of great practical significance and application value for improving the performance testing level of thrust bearings (including traditional mechanical thrust bearings and new magnetic thrust bearings) and promoting the advancement of bearing technology. Utility Model Content
[0005] The purpose of this invention is to provide a bidirectional loading rotary device for bearing testing, which can bear large bidirectional loads, has high coaxiality, and allows the central axis connecting the workpiece to be tested to rotate smoothly. It can be conveniently applied to test bench systems for traditional bearings or magnetic thrust bearings.
[0006] To achieve the above objectives, this utility model provides a bidirectional loading rotary device for bearing testing, comprising:
[0007] A bearing assembly comprising a first housing ring, a shaft ring, and a second housing ring arranged coaxially in sequence, the bearing assembly comprising a plurality of first balls and a plurality of second balls, the first balls being sandwiched between the first housing ring and the shaft ring, and the second balls being sandwiched between the second housing ring and the shaft ring;
[0008] Central axis;
[0009] End plate, used to connect the loading device;
[0010] A bushing has an inner cavity for accommodating the bearing assembly. The opening of the inner cavity is covered by the end plate. A central shaft extends through the bushing into the bearing assembly in the inner cavity. The end of the central shaft exposed outside the bushing is used to connect with the workpiece being measured. The central shaft is fixedly connected to the shaft ring so that the shaft ring can rotate with the central shaft. A first seat ring is fixedly connected to the bushing, and a second seat ring is fixedly connected to the bushing.
[0011] Optionally, the bidirectional loading rotary device includes a fixing block located in the inner cavity. The portion of the central shaft located in the inner cavity is provided with a shoulder. The central shaft passes through the inner ring of the shaft ring. Both sides of the shaft ring are abutted by the fixing block and the shoulder, respectively, so that the shaft ring is fixed on the central shaft.
[0012] Optionally, the fixing block has a groove at one end that abuts against the shaft ring for accommodating the end of the central shaft, and there is a gap between the end of the central shaft and the bottom of the groove. The fixing block is connected to the end of the central shaft by bolts, and the bottom of the groove has a through hole for the bolts to pass through.
[0013] Optionally, the inner wall of the cavity is provided with a first annular groove corresponding to the position of the shaft ring, and a gap is left between the shaft ring and the first annular groove.
[0014] Optionally, the end of the central shaft exposed outside the bushing is provided with a flange, which is used to connect to the workpiece being measured.
[0015] Optionally, the bidirectional loading rotary device includes a first ball retainer and a second ball retainer. The first ball retainer is annular and has receiving grooves that correspond one-to-one with the first balls. The first balls can roll in the receiving grooves. The second ball retainer is similar.
[0016] Optionally, one side of the shaft ring is provided with a second annular groove for the first ball to roll, the other side of the shaft ring is provided with a third annular groove for the second ball to roll, the first seat ring is provided with a fourth annular groove for the first ball to roll, and the second seat ring is provided with a fifth annular groove for the second ball to roll.
[0017] Optionally, the bushing is provided with an oil injection hole that leads into the inner cavity.
[0018] Optionally, the bearing assembly, the central shaft, the end plate, and the bushing are arranged coaxially.
[0019] Optionally, the bidirectional loading rotary device includes a first set bolt and a second set bolt, wherein the first set bolt passes through the bushing and abuts against the outer ring of the first seat ring, and the second set bolt passes through the bushing and abuts against the outer ring of the second seat ring.
[0020] As configured above, both the first and second bearing rings are fixedly connected to the bushing, clamping the bearing ring within the bushing and ensuring its position within the bushing. A fixing block further secures the bearing ring to the central shaft. This design ensures structural stability within the bushing, preventing any movement and guaranteeing the coaxiality of the bidirectional loading rotary device. It also facilitates alignment and ensures smooth rotation of the central shaft. In summary, this bidirectional loading rotary device can withstand large bidirectional loads, exhibits high coaxiality, allows for smooth rotation of the central shaft connecting the workpiece, and can be readily applied to test bench systems for traditional bearings or magnetic thrust bearings. Furthermore, it is characterized by simple operation, easy maintenance, and low cost. Attached Figure Description
[0021] Those skilled in the art will understand that the accompanying drawings are provided to better understand the present invention and do not constitute any limitation on the scope of the present invention. Wherein:
[0022] Figure 1 This is a schematic diagram of a bidirectional loading rotary device for bearing testing according to an embodiment of the present invention;
[0023] Figure 2 This is a schematic diagram of the bushing of a bidirectional loading rotary device for bearing testing according to an embodiment of the present invention;
[0024] Figure 3 This is a schematic diagram of the first ball cage of a bidirectional loading rotary device for bearing testing according to an embodiment of the present invention.
[0025] The reference numerals in the attached figures are as follows:
[0026] 1-Central shaft; 11-Shoulder; 12-Flange; 121-Stop; 2-End plate; 21-Flange edge; 3-Sleeve; 31-Inner cavity; 32-First annular groove; 33-Oil injection hole; 34-Sleeve hole; 35-Oil seal; 36-Flange flange; 41-First seat ring; 42-Second seat ring; 43-Shaft ring; 44-First ball; 441-First ball retainer; 442-Receiving groove; 45-Second ball; 5-Fixing block; 51-Groove; 52-Through hole; 53-Bolt countersunk hole. Detailed Implementation
[0027] In this document, unless otherwise stated, the terms “upper,” “lower,” “left,” “right,” “inner,” “outer,” “front,” “back,” “top,” “bottom,” etc., are used to indicate orientation or positional relationship based on the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a characteristic orientation and operation, and therefore should not be construed as a limitation of the present invention.
[0028] The specific embodiments of this utility model will now be described in more detail with reference to the accompanying drawings. The advantages and features of this utility model will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.
[0029] The preferred embodiments of this utility model are given below with reference to the accompanying drawings and described in detail.
[0030] Figure 1 This is a schematic diagram of a bidirectional loading rotary device for bearing testing according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the bushing of a bidirectional loading rotary device for bearing testing according to an embodiment of this utility model. Please refer to it. Figure 1 and Figure 2 This utility model provides a bidirectional loading rotary device for bearing testing, including a bearing assembly, a central shaft 1, an end plate 2, and a bushing 3. The bushing 3 has a cylindrical structure, and the bearing assembly, central shaft 1, end plate 2, and bushing 3 are coaxially arranged.
[0031] The bearing assembly includes a first race 41, a shaft race 43, and a second race 42 arranged coaxially in sequence. The bearing assembly also includes a plurality of first balls 44 and a plurality of second balls 45. The first balls 44 are sandwiched between the first race 41 and the shaft race 43, and the second balls 45 are sandwiched between the second race 42 and the shaft race 43. The first balls 44 and the second balls 45 can be, for example, steel balls.
[0032] End plate 2 is used to connect the loading device. It is understood that the loading device is a device for applying load, and may also include a device for measuring load. For example, the loading device may include a manual screw loading mechanism and a force sensor, which can conveniently and quickly load a specified load. The end plate 2 has a force sensor mounting interface. Preferably, a spoke-type force sensor can be installed.
[0033] The bushing 3 has an inner cavity 31 for accommodating the bearing assembly. The inner cavity 31 is cylindrical, and its opening is covered by the end plate 2. The central shaft 1 extends through the bushing 3 into the bearing assembly within the inner cavity 31. It is understood that the central shaft 1 enters the bushing 3 from the side opposite the opening. The end of the central shaft 1 exposed on the bushing 3 is used for connection to the workpiece being measured or to a drive shaft. The central shaft 1 is fixedly connected to the shaft ring 43 so that the shaft ring 43 can rotate with the central shaft 1. Specifically, the bidirectional loading rotary device includes a fixing block 5 located within the inner cavity 31. The portion of the central shaft 1 within the inner cavity 31 has a shoulder 11. It is understood that the outer diameter of the central shaft 1 decreases at the shoulder 11 after extending into the inner cavity 31, thus forming the shoulder 11. The central shaft 1 passes through the inner ring of the shaft ring 43, and the shaft ring 43 is held in place by the fixing block 5 and the shoulder 11 on both sides, thus fixing the shaft ring 43 to the central shaft 1. Furthermore, the fixing block 5 has a groove 51 at one end abutting against the shaft ring 43 for accommodating the end of the central shaft 1. A gap is left between the end of the central shaft 1 and the bottom of the groove 51. The fixing block 5 is connected to the end of the central shaft 1 by a bolt (not shown in the figure). The bottom of the groove 51 has a through hole 52 for the bolt to pass through. Furthermore, the fixing block 5 has a bolt countersunk hole 53 on the side away from the shaft ring 43, which communicates with the through hole 52. Furthermore, the end of the central shaft 1 has a threaded hole (not shown in the figure) that mates with the bolt. Tightening the bolt can shorten the distance between the fixing block 5 and the shaft shoulder 11, thereby allowing the fixing block 5 and the shaft shoulder 11 to clamp the shaft ring 43 together, so that the shaft ring 43 can rotate with the central shaft 1. It can be understood that after the shaft ring 43 is clamped by the fixing block 5 and the shaft shoulder 11, a gap is left between the end of the central shaft 1 and the bottom of the groove 51. Only by leaving this gap can the purpose of clamping the shaft ring 43 by tightening the bolt be achieved. A gap is left between the fixing block 5 and the end plate 2 to ensure smooth and unobstructed rotation of the central shaft 1 and the shaft ring 43 within the bushing 3. The first seat ring 41 is fixedly connected to the bushing 3, and the second seat ring 42 is fixedly connected to the bushing 3. For example, the outer ring of the first seat ring 41 and the bushing 3 can be fixedly connected by an interference fit, and the outer ring of the second seat ring 42 and the bushing 3 can be fixedly connected by an interference fit. And / or, the bidirectional loading rotary device includes a first set bolt and a second set bolt (not shown in the figure). The first set bolt passes through the bushing 3 and abuts against the outer ring of the first seat ring 41, and the second set bolt passes through the bushing 3 and abuts against the outer ring of the second seat ring 42, thereby firmly fixing the first seat ring 41 and the second seat ring 42 within the bushing 3, stabilizing the internal structure of the bushing 3, preventing movement, ensuring the coaxiality of the bidirectional loading rotary device, avoiding eccentric rotation, thus ensuring smooth rotation, greatly reducing wear, and extending service life. The first race 41, the second race 42, and the shaft race 43 must all withstand the rated load.
[0034] The bidirectional loading rotary device includes a first ball cage 441 and a second ball cage. The first ball cage 441 is annular, such as... Figure 3 As shown, the first ball retainer 441 has receiving grooves 442 corresponding to the first balls 44, allowing the first balls 44 to roll within the receiving grooves 442. Similarly, the second ball retainer has the same shape as the first ball retainer 441, i.e., it is annular. The second ball retainer also has receiving grooves corresponding to the second balls 45, allowing the second balls 45 to roll within these grooves. It can be understood that the receiving grooves 442 on the first ball retainer 441 are through grooves, allowing the sides of the first balls 44 to protrude from the first ball retainer 441 to contact the first bearing ring 41 and the shaft ring 43 respectively. Similarly, the receiving grooves on the second ball retainer are through grooves, allowing the sides of the second balls 45 to protrude from the second ball retainer to contact the second bearing ring 42 and the shaft ring 43 respectively. Understandably, the first ball cage 441 is located between the first seat ring 41 and the shaft ring 43, and the second ball cage is located between the second seat ring 42 and the shaft ring 43. Figure 1 The first ball cage 441 and the second ball cage are not shown in the figure.
[0035] Furthermore, one side of the shaft ring 43 is provided with a second annular groove for the first ball 44 to roll, and the other side of the shaft ring 43 is provided with a third annular groove for the second ball 45 to roll. The first seat ring 41 is provided with a fourth annular groove for the first ball 44 to roll, and the second seat ring 42 is provided with a fifth annular groove for the second ball 45 to roll. The second and fourth annular grooves clamp the first ball 44, and the third and fifth annular grooves clamp the second ball 45, thereby clamping the shaft ring 43 tightly through the first seat ring 41 and the second seat ring 42.
[0036] Preferably, the inner wall of the inner cavity 31 is provided with a first annular groove 32 corresponding to the position of the shaft ring 43, and a gap is left between the shaft ring 43 and the first annular groove 32 to ensure smooth rotation of the shaft ring 43 without jamming. It is understood that the depth of the first annular groove 32 is shallow enough to avoid contact with the shaft ring 43, and the outer diameter of the shaft ring 43 can be approximately the same as the inner diameter of the bushing 3. When installing the shaft ring 43, it is simply pushed into the first annular groove 32. Preferably, the bushing 3 is provided with an oil filling hole 33 leading into the inner cavity 31 for adding grease / oil. For example, the oil filling hole 33 can be directly connected to the first annular groove 32. It is understood that the bushing 3 is provided with a bushing hole 34 for the insertion of the central shaft 1, and an oil seal 35 is provided inside the bushing hole 34. The oil seal 35 can be, for example, an annular felt.
[0037] A flange 12 is provided at the end of the central shaft 1 exposed above the bushing 3. The flange 12 is used to connect with the workpiece being measured, which is the bearing being measured. The flange 12 is provided with a stop 121 to facilitate alignment with the workpiece being measured. Connecting the workpiece being measured through the flange 12 also improves the coaxiality between the bidirectional loading rotary device and the workpiece being measured.
[0038] The outer periphery of the end plate 2 is provided with a flange edge 21, and the opening end of the bushing 3 is provided with a flange flange 36. The flange edge 21 of the end plate 2 and the flange flange 36 of the bushing 3 are connected and fixed by bolts.
[0039] As configured above, the first bearing ring 41 and the second bearing ring 42 are both fixedly connected to the bushing 3. The first bearing ring 41 and the second bearing ring 42 clamp the bearing ring 43 in the bushing 3, thereby ensuring the position of the bearing ring 43 within the bushing 3. The bearing ring 43 is then fixed to the central shaft 1 by the fixing block 5. This configuration ensures the stability of the internal structure of the bushing 3 without any movement, guarantees the coaxiality of the bidirectional loading rotary device, facilitates centering, and allows the central shaft 1 to rotate smoothly. In summary, the bidirectional loading rotary device of this invention can bear a large bidirectional load (bidirectional, i.e., the end plate side and the side of the central shaft exposed on the bushing), has high coaxiality, allows the central shaft 1 connected to the workpiece to rotate smoothly, can be conveniently applied to test bench systems for traditional bearings or magnetic thrust bearings, and features simple operation, simple maintenance, and low cost.
[0040] During installation of the bidirectional loading rotary device of this utility model, grease / oil is first injected. The first bearing ring 41, the first ball retainer 441, the shaft ring 43, the second ball retainer, and the second bearing ring 42 are then sequentially installed into the bushing 3. The first and second set bolts are tightened to firmly fix the first bearing ring 41 and the second bearing ring 42 within the bushing 3. An oil seal 35 is then installed to prevent grease / oil leakage. The central shaft 1 is inserted into the inner cavity 31 of the bushing 3 through the bushing hole 34. The central shaft 1 passes sequentially through the first bearing ring 41, the first ball retainer 441, and the shaft ring 43, with the shoulder 11 of the central shaft 1 abutting against the shaft ring 43. The fixing block 5 is then passed through the inner ring of the second bearing ring 42 and the second ball retainer, so that the end of the central shaft 1 is inserted into the groove 51 of the fixing block 5. The bolts are then tightened, thereby clamping the shaft ring 43 between the fixing block 5 and the shoulder 11. Next, cover the end plate 2 with the opening of the bushing 3, and use bolts to fix the flange edge 21 of the end plate 2 and the flange flange 36 of the bushing 3. At this time, the bearing assembly is firmly fixed between the bushing 3 and the end plate 2 without shaking and is well aligned.
[0041] It should be noted that references to "an embodiment," "an embodiment," "a specific embodiment," "some embodiments," etc., in the specification only indicate that the described embodiment may include a specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Additionally, when a specific feature, structure, or characteristic is described in conjunction with an embodiment, whether explicitly described or not, implementing such a feature, structure, or characteristic in conjunction with other embodiments is within the knowledge of those skilled in the art.
[0042] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple, and relevant parts can be referred to the method section.
[0043] It should also be noted that although the present invention has been disclosed above with reference to preferred embodiments, these embodiments are not intended to limit the present invention. For any person skilled in the art, many possible variations and modifications can be made to the present invention without departing from the scope of the present invention, or equivalent embodiments can be modified based on the disclosed technical content. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the present invention shall still fall within the protection scope of the present invention.
[0044] It should also be understood that, unless otherwise specified or indicated, the terms “first,” “second,” “third,” etc., in the specification are used only to distinguish the various components, elements, and steps in the specification, and not to indicate the logical or sequential relationships between the various components, elements, and steps.
[0045] Furthermore, it should be recognized that the terminology described herein is used only to describe particular embodiments and not to limit the scope of the invention. It must be noted that the singular forms “a” and “an” used herein and in the appended claims include plural bases unless the context clearly indicates otherwise. For example, a reference to “a step” or “an apparatus” means a reference to one or more steps or apparatuses, and may include secondary steps and secondary apparatuses. All conjunctions used should be understood in the broadest sense. Also, the word “or” should be understood to have the definition of logical “or” rather than logical “exclusive OR”, unless the context clearly indicates otherwise. Furthermore, implementation of the methods and / or devices in embodiments of the invention may include performing selected tasks manually, automatically, or in combination.
Claims
1. A bidirectional loading rotary device for bearing testing, characterized in that, include: A bearing assembly comprising a first housing ring, a shaft ring, and a second housing ring arranged coaxially in sequence, the bearing assembly comprising a plurality of first balls and a plurality of second balls, the first balls being sandwiched between the first housing ring and the shaft ring, and the second balls being sandwiched between the second housing ring and the shaft ring; Central axis; End plate, used to connect the loading device; A bushing has an inner cavity for accommodating the bearing assembly. The opening of the inner cavity is covered by the end plate. A central shaft extends through the bushing into the bearing assembly in the inner cavity. The end of the central shaft exposed outside the bushing is used to connect with the workpiece being measured. The central shaft is fixedly connected to the shaft ring so that the shaft ring can rotate with the central shaft. A first seat ring is fixedly connected to the bushing, and a second seat ring is fixedly connected to the bushing.
2. The bidirectional loading rotary device for bearing testing as described in claim 1, characterized in that, The bidirectional loading rotary device includes a fixing block located in the inner cavity. The portion of the central shaft located in the inner cavity is provided with a shoulder. The central shaft passes through the inner ring of the shaft ring. Both sides of the shaft ring are abutted by the fixing block and the shoulder respectively, so that the shaft ring is fixed on the central shaft.
3. The bidirectional loading rotary device for bearing testing as described in claim 2, characterized in that, The fixing block has a groove at one end that abuts against the shaft ring for accommodating the end of the central shaft. There is a gap between the end of the central shaft and the bottom of the groove. The fixing block is connected to the end of the central shaft by bolts. The bottom of the groove has a through hole for the bolts to pass through.
4. The bidirectional loading rotary device for bearing testing as described in claim 1, characterized in that, The inner wall of the cavity is provided with a first annular groove corresponding to the position of the shaft ring, and a gap is left between the shaft ring and the first annular groove.
5. The bidirectional loading rotary device for bearing testing as described in claim 1, characterized in that, The central shaft has a flange at the end exposed outside the bushing, and the flange is used to connect to the workpiece being measured.
6. The bidirectional loading rotary device for bearing testing as described in claim 1, characterized in that, The bidirectional loading rotary device includes a first ball retainer and a second ball retainer. The first ball retainer is annular and has receiving grooves that correspond one-to-one with the first balls. The first balls can roll in the receiving grooves. The second ball retainer is similar.
7. The bidirectional loading rotary device for bearing testing as described in claim 1, characterized in that, One side of the shaft ring is provided with a second annular groove for the first ball to roll, and the other side of the shaft ring is provided with a third annular groove for the second ball to roll. The first seat ring is provided with a fourth annular groove for the first ball to roll, and the second seat ring is provided with a fifth annular groove for the second ball to roll.
8. The bidirectional loading rotary device for bearing testing as described in claim 1, characterized in that, The bushing is provided with an oil injection hole that leads into the inner cavity.
9. The bidirectional loading rotary device for bearing testing as described in claim 1, characterized in that, The bearing assembly, the central shaft, the end plate, and the bushing are arranged coaxially.
10. The bidirectional loading rotary device for bearing testing as described in claim 1, characterized in that, The bidirectional loading rotary device includes a first set bolt and a second set bolt. The first set bolt passes through the bushing and abuts against the outer ring of the first seat ring, and the second set bolt passes through the bushing and abuts against the outer ring of the second seat ring.