Rotating shaft sleeve and torque meter

Abstract

This utility model discloses a rotating bushing and a torque meter in the field of mechanical rotating body technology. The bearing disclosed in this utility model includes a cage and balls. The cage has multiple mounting holes along its circumference, and the mounting holes penetrate the cage radially, so that the balls in the mounting holes protrude from the inner and outer ring surfaces of the cage, and can directly contact the rotor and stator through the balls. Without the outer ring of the traditional bearing, the overall diameter of the bearing can be reduced. At the same time, without the inner ring of the traditional bearing, the balls directly contact the stator and rotor, which can further reduce the diameter of the bearing. The overall size of the bearing is smaller, which reduces the diameter and volume of the rotating bushing that assembles this bearing. Ultimately, this reduces the shaft deflection when the torque meter is working at high speed, and the radial runout of the toothed disk on the shaft relative to the magnetoelectric sensor is reduced, thus increasing the measurement accuracy.

Description

Technical Field

[0001] This utility model relates to the field of mechanical rotating body technology, specifically a rotating bushing and a torque measuring device. Background Technology

[0002] Bearings are an important component in modern mechanical equipment. Their main function is to support rotating mechanical parts, reduce the coefficient of friction during their movement, and ensure their rotational accuracy.

[0003] The utility model patent with authorization announcement number CN203670497U discloses a lathe spindle bearing. Currently, the bearing structure usually includes an inner ring, balls and an outer ring. The inner ring and outer ring are respectively assembled with the stator and the rotor. This means that the gap left between the stator and the rotor needs to take into account the overall radial thickness of the inner ring, balls and outer ring.

[0004] For example, the torque measuring device used in the development of transmission systems is subject to the increasing operating speed of transmission systems and engines as development technology advances. Consequently, the test speed of the corresponding test equipment is also increasing. The torque measuring device has a rotating bushing, which includes a coil fixing seat and a rotating sleeve. The coil fixing seat and the rotating sleeve are rotatably connected by a bearing. The larger the size of the rotating bushing, the longer the rotor support system in the torque measuring device will be, which will eventually lead to a larger bearing fulcrum distance. A larger bearing fulcrum distance will increase the deflection of the shaft at high speeds, and the radial runout of the toothed disk on the shaft relative to the magnetoelectric sensor will increase, resulting in a decrease in measurement accuracy.

[0005] Therefore, traditional bearings are difficult to meet the requirements of some devices with high size requirements, and a smaller and more stable bearing is needed.

[0006] Based on this, the present invention designs a rotating bushing and a torque measuring device to solve the above problems. Utility Model Content

[0007] To achieve the above objectives, this utility model provides the following technical solution: a bearing, comprising a cage and balls, wherein the cage is annular and has a plurality of mounting holes along its circumferential direction, the mounting holes being matched with the balls and used for mounting the balls; the radial thickness of the cage is less than the diameter of the balls, and the mounting holes penetrate the cage radially, so that the balls in the mounting holes protrude from the inner and outer annular surfaces of the cage, and the two ends of the balls protruding from the cage are respectively used to abut against the rotor and the stator.

[0008] As a further embodiment of this invention, the plurality of assembly holes are arranged at equal intervals on the retainer.

[0009] A rotating bushing includes a bearing, a coil mounting base, and a rotating sleeve. The bearing is radially disposed between the coil mounting base and the rotating sleeve to achieve rotational engagement between the coil mounting base and the rotating sleeve.

[0010] As a further embodiment of this utility model, the coil fixing seat is provided with a first annular edge for assembling the bearing, and the rotating sleeve is provided with a second annular edge for assembling the bearing. The difference between the inner radius of the second annular edge and the outer radius of the first annular edge matches the diameter of the ball, so that the ball can contact both the first and second annular edges simultaneously.

[0011] As a further embodiment of this utility model, the outer ring of the first annular side and / or the inner ring of the second annular side are provided with a limiting component for restricting the axial position of the bearing.

[0012] As a further embodiment of this utility model, the limiting component includes a first boss disposed on the outer ring of the first annular side and a second boss disposed on the inner ring of the second annular side. The first boss and the second boss are disposed on both ends of the ball in the bearing axial direction and are in contact with the ball to limit the axial position of the bearing.

[0013] As a further embodiment of this utility model, the radial height of the first boss is less than the radial height of the portion of the ball protruding from the inner annular surface of the cage, and the radial height of the second boss is less than the radial height of the portion of the ball protruding from the outer annular surface of the cage.

[0014] As a further embodiment of this utility model, the limiting component includes a groove formed on the outer ring of the first annular side and / or the inner ring of the second annular side, wherein the ball protruding from the cage portion is rotatably embedded in the groove to limit the axial position of the bearing.

[0015] As a further embodiment of this utility model, the cross-section of the groove is V-shaped so that the vertical distance from different contact positions of the ball and the same groove to the bearing axis is equal.

[0016] A torque tester includes a rotating bushing.

[0017] This utility model has the following beneficial effects:

[0018] The bearing disclosed in this utility model includes a cage and balls. The cage has multiple mounting holes along its circumference and the mounting holes penetrate the cage radially, so that the balls in the mounting holes protrude from the inner and outer ring surfaces of the cage and can directly contact the rotor and stator. Without the outer ring of traditional bearings, the overall diameter of the bearing can be reduced. At the same time, without the inner ring of traditional bearings, the balls directly contact the stator and rotor, which can further reduce the diameter of the bearing, making the overall size of the bearing smaller.

[0019] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of the bearing structure from the front view.

[0022] Figure 2 This is a schematic diagram of the bearing's side view structure;

[0023] Figure 3 This is a schematic diagram of the overall structure of the rotating bushing;

[0024] Figure 4 This is a schematic diagram of the structure of the first embodiment of the limiting component;

[0025] Figure 5 This is a schematic diagram of the second embodiment of the limiting component.

[0026] Legend:

[0027] 1. Positioning cylinder; 2. Coil fixing seat; 21. First annular edge; 22. First boss; 23. Groove; 3. Bearing; 31. Cage; 32. Ball; 4. Rotary sleeve; 41. Second annular edge; 42. Second boss. Detailed Implementation

[0028] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0029] Please see Figure 1-5 This utility model provides a technical solution: a bearing, including a cage 31 and balls 32. The cage 31 is annular and has multiple mounting holes along its circumference. The mounting holes match the balls 32 and are used to install the balls 32. The radial thickness of the cage 31 is less than the diameter of the balls 32, and the mounting holes penetrate the cage 31 radially, so that the balls 32 in the mounting holes protrude from the inner and outer annular surfaces of the cage 31. The two ends of the balls 32 protruding from the cage 31 are respectively used to abut against the rotor and the stator.

[0030] By opening a spherical mounting hole on the cage 31, with the diameter of the mounting hole matching the diameter of the ball 32, the ball 32 can be rolled in the mounting hole. At the same time, the radial thickness of the cage 31 is less than the diameter of the ball 32, and the mounting hole penetrates the cage 31 radially. Thus, when the ball 32 is assembled into the mounting hole of the cage 31, the ball 32 in the mounting hole will protrude from the inner and outer ring surfaces of the cage 31. The parts of the ball 32 protruding from the inner and outer ring surfaces of the cage 31 can contact the rotor and stator respectively, realizing the rotational engagement of the rotor and stator. At this time, the radial thickness of the bearing 3 is the diameter of the ball 32. Therefore, the clearance between the rotor and stator for assembling the bearing 3 only needs to consider the diameter of the ball, thereby reducing the diameter of the rotor or stator. The cage 31 is used to maintain the spacing between the balls 32 during use, ensuring that the circumferential spacing between the balls 32 does not change during use, and ensuring the safety of bearing use.

[0031] like Figure 1-2 As shown, the bearing 3 disclosed in this utility model only includes a cage 31 and balls 32. It does not have the outer ring in the traditional bearing 3, which can reduce the overall diameter of the bearing 3. At the same time, it does not have the inner ring in the traditional bearing 3. The balls 32 directly contact the stator and rotor, which can further reduce the diameter of the bearing 3. In use, assuming that the stator is located inside the bearing 3 and the rotor is sleeved outside the bearing 3, if the stator diameter cannot be further reduced, the bearing 3 disclosed in this utility model can further reduce the rotor diameter.

[0032] Specifically, multiple mounting holes are arranged at equal intervals on the cage 31, so that the balls 32 on the cage 31 are evenly distributed along the circumference of the cage 31, so that the multiple balls 32 evenly share the load, reduce local stress, improve operational stability, reduce the wear risk of individual balls 32, and extend the overall life of the bearing 3.

[0033] A rotating bushing includes the aforementioned bearing 3, as well as a coil fixing seat 2 and a rotating sleeve 4. The bearing 3 is disposed radially between the coil fixing seat 2 and the rotating sleeve 4 to achieve rotational engagement between the coil fixing seat 2 and the rotating sleeve 4.

[0034] like Figure 3 As shown, the bearing 3 is radially positioned between the coil fixing seat 2 and the rotating sleeve 4 to achieve rotational engagement between the coil fixing seat 2 and the rotating sleeve 4. Since the bearing 3 only includes a cage 31 and balls 32, the radial thickness and diameter of the bearing 3 are reduced. This allows for a smaller diameter of the rotating sleeve 4 while maintaining the same diameter of the coil fixing seat 2 and wall thickness. Figure 3 As shown, a positioning cylinder 1 is installed around the coil fixing seat 2 and the rotating sleeve 4. When the diameter of the rotating sleeve 4 is reduced, the diameter of the positioning cylinder 1 can also be reduced, thereby reducing the diameter and volume of the overall rotating sleeve.

[0035] Specifically, such as Figure 4-5 As shown, the coil fixing seat 2 is provided with a first annular edge 21 for assembling the bearing 3, and the rotating sleeve 4 is provided with a second annular edge 41 for assembling the bearing 3. The difference between the inner ring radius of the second annular edge 41 and the outer ring radius of the first annular edge 21 is matched with the diameter of the ball 32 so that the ball 32 can contact the first annular edge 21 and the second annular edge 41 at the same time.

[0036] The inner diameter of the second annular edge 41 is larger than the outer diameter of the first annular edge 21. When the coil fixing seat 2 and the rotating sleeve 4 are assembled, the second annular edge 41 is fitted onto the first annular edge 21, and the gap between the second annular edge 41 and the first annular edge 21 is used to assemble the bearing 3, thereby realizing the rotational engagement between the coil fixing seat 2 and the rotating sleeve 4. The difference between the inner ring radius of the second annular edge 41 and the outer ring radius of the first annular edge 21 matches the diameter of the ball 32, so that the ball 32 always contacts the first annular edge 21 and the second annular edge 41 at the same time, while the diameter of the second annular edge 41 can be reduced, thereby reducing the diameter of the rotating sleeve 4, and finally achieving the effect of reducing the diameter and volume of the rotating sleeve.

[0037] Specifically, such as Figure 4-5 As shown, the outer ring of the first annular edge 21 and / or the inner ring of the second annular edge 41 are provided with a limiting component for limiting the axial position of the bearing 3.

[0038] Since bearing 3 has no outer and inner rings, and in order to achieve the rotational engagement between coil fixing seat 2 and rotating sleeve 4, the balls 32 in bearing 3 are in a rolling engagement with the first annular edge 21 and the second annular edge 41. In order to prevent bearing 3 from moving axially between the first annular edge 21 and the second annular edge 41, a limiting component is provided on the outer ring of the first annular edge 21 and the inner ring of the second annular edge 41 to limit the axial movement of bearing 3. This ensures that bearing 3 will not move axially with the first annular edge 21 and the second annular edge 41 during the use of the rotating sleeve, thus ensuring the stable use of the rotating sleeve.

[0039] Figure 4 The first embodiment of the limiting component is shown. In this embodiment, the limiting component is a first boss 22 provided on the outer ring of the first annular edge 21 and a second boss 42 provided on the inner ring of the second annular edge 41. The first boss 22 and the second boss 42 contact the balls 32 at both ends of the bearing 3 in the axial direction to limit the axial position of the bearing 3.

[0040] like Figure 4As shown, since the bearing 3 is assembled on the outer ring of the first annular edge 21, a first boss 22 is provided on the outer ring of the first annular edge 21. Since the bearing 3 is assembled on the inner ring of the second annular edge 41, a second boss 42 is provided on the inner ring of the second annular edge 41. After the bearing 3 is assembled between the first annular edge 21 and the second annular edge 41, the first boss 22 and the second boss 42 respectively contact the two ends of the ball 32 in the axial direction of the bearing 3, restricting the path of the ball 32. This allows the ball 32 to only roll circumferentially between the first boss 22 and the second boss 42, thereby achieving the effect of restricting the axial position of the bearing 3. This ensures that the bearing 3 will not move axially during the use of the rotating bushing, ensuring the safety of the rotating bushing.

[0041] Furthermore, such as Figure 4 As shown, the radial height of the first boss 22 is less than the radial height of the portion of the ball 32 protruding from the inner annular surface of the cage 31, and the radial height of the second boss 42 is less than the radial height of the portion of the ball 32 protruding from the outer annular surface of the cage 31, thereby preventing the first boss 22 and the second boss 42 from contacting the cage 31 and preventing the first boss 22 and the second boss 42 from generating sliding friction with the cage 31.

[0042] When the bearing 3 is assembled between the first annular edge 21 and the second annular edge 41, since the ball 32 protrudes from the inner and outer annular surfaces of the cage 31, it can be ensured that the cage 31 does not contact the first annular edge 21 and the second annular edge 41. At the same time, the distance between the cage 31 and the first annular edge 21 is the radial height of the portion of the ball 32 protruding from the inner annular surface of the cage 31, and the distance between the cage 31 and the second annular edge 41 is the radial height of the portion of the ball 32 protruding from the outer annular surface of the cage 31. In order to prevent the first boss 22 and the second boss 42 from contacting the cage 31, the radial height of the first boss 22 needs to be less than the radial height of the portion of the ball 32 protruding from the inner annular surface of the cage 31, and the radial height of the second boss 42 needs to be less than the radial height of the portion of the ball 32 protruding from the outer annular surface of the cage 31, so as to prevent the cage 31 from contacting the first boss 22 and / or the second boss 42 and causing wear.

[0043] Figure 5 A second embodiment of the limiting component is shown. In this embodiment, the limiting component includes a groove 23 formed on the outer ring of the first annular edge 21 and / or the inner ring of the second annular edge 41. A portion of the structure protruding from the retainer 31 is rotatably embedded in the groove 23 to limit the axial position of the bearing 3.

[0044] like Figure 5As shown, a groove 23 is formed on the outer ring of the first annular edge 21 and / or the inner ring of the second annular edge 41, and the ball 32 is placed in the groove 23. The groove 23 restricts the rolling trajectory of the ball 32, thereby achieving the effect of restricting the axial position of the bearing 3. Since the ball 32 is placed in the groove 23, the diameter of the second annular edge 41 needs to be adjusted accordingly.

[0045] When the groove 23 is opened on the outer ring of the first annular edge 21 or the inner ring of the second annular edge 41, the ball 32 is first assembled into the groove 23, and then the first annular edge 21 and the second annular edge 41 are combined and assembled. Assuming that the groove 23 is opened on the first annular edge 21, the outer diameter of the first annular edge 21 is larger than the diameter of the circle formed by the ball 32. The bearing 3 cannot be directly assembled onto the first annular edge 21. The cage 31 needs to be heated first to increase the diameter of the cage 31. Then the bearing 3 is sleeved onto the first annular edge 21 and the ball 32 is located in the groove 23. After the cage 31 cools down, the second annular edge 41 is assembled onto the first annular edge 21. Since the ball 32 is located in the groove 23 at this time, the groove 23 restricts the trajectory of the ball 32 and prevents the ball 32 from moving in the axial direction, thereby achieving the axial position restriction of the bearing 3.

[0046] When both the first annular edge 21 and the second annular edge 41 have grooves 23, the retainer 31 is first heated to increase its diameter. Then, the bearing 3 is assembled onto the first annular edge 21 and the balls 32 are located in the grooves 23 on the outer ring of the first annular edge 21. After the bearing 3 cools down, the second annular edge 41 is heated to increase its diameter. Then, the second annular edge 41 is fitted onto the first annular edge 21 and the bearing 3, and the balls 32 of the bearing 3 are located in the grooves 23 on the inner ring of the second annular edge 41. This completes the assembly of the coil fixing seat 2 and the rotating sleeve 4. At this time, the bearing 3 can also restrict the axial movement of the coil fixing seat 2 and the rotating sleeve 4, preventing the coil fixing seat 2 and the rotating sleeve 4 from moving axially relative to each other.

[0047] Specifically, the cross-section of the groove 23 can be rectangular or arc-shaped, as long as it can restrict the movement of the ball 32 in the bearing axial direction;

[0048] Preferably, the cross-section of the groove 23 is V-shaped so that the distance from different contact positions of the ball 32 with the same groove 23 to the axis of the bearing 3 is equal;

[0049] like Figure 5 As shown, when the cross-section of the groove 23 is V-shaped, the ball 32 will contact both sides of the groove 23 simultaneously, as... Figure 5As shown, the contact points between the ball 32 and the groove 23 are A and B. Since the vertical distances from points A and B to the axial direction of the bearing 3 are equal, the rolling stroke of the ball 32 at points A and B is consistent during the rolling process. The ball 32 and the two sides inside the groove 23 always experience rolling friction, and there will be no sliding friction due to different rolling paths. This reduces the wear between the ball 32, the first annular edge 21 and the second annular edge 41, and improves the service life of the bearing 3.

[0050] A torque tester includes the aforementioned rotating bushing. When the diameter and volume of the rotating bushing are reduced, the height and length of the rotor support system in the torque tester can also be reduced. The length of the rotor support system is reduced, and the distance between the bearing support points is reduced.

[0051] According to the phase difference calculation formula, when the maximum torsion angle ∆Ψ is constant, the more teeth the toothed disk has, the higher the phase difference sensitivity.

[0052] As can be seen from the output waveform of the magnetoelectric sensor: the greater the radial runout of the toothed disk on the shaft relative to the magnetoelectric sensor, the lower the phase difference measurement accuracy.

[0053] When the bearing pivot distance increases, the shaft deflection increases during high-speed rotation, and the radial runout of the toothed disk on the shaft relative to the magnetoelectric sensor increases, resulting in decreased measurement accuracy. Conversely, when the bearing pivot distance decreases, the shaft deflection decreases during high-speed rotation, and the radial runout of the toothed disk on the shaft relative to the magnetoelectric sensor decreases, resulting in increased measurement accuracy.

[0054] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0055] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0056] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A rotating bushing, comprising a bearing (3), a coil fixing seat (2), and a rotating sleeve (4), wherein the bearing (3) comprises a cage (31) and balls (32), characterized in that: The retainer (31) is annular and has a plurality of mounting holes along the circumferential direction. The mounting holes are matched with the balls (32) and are used to install the balls (32). The radial thickness of the cage (31) is less than the diameter of the ball (32), and the mounting hole penetrates the cage (31) radially, so that the ball (32) in the mounting hole protrudes from the inner and outer ring surfaces of the cage (31). The two ends of the ball (32) protruding from the cage (31) are used to abut against the rotor and the stator respectively. The bearing (3) is located in the radial direction between the coil fixing seat (2) and the rotating sleeve (4) to achieve rotational engagement between the coil fixing seat (2) and the rotating sleeve (4).

2. The rotating bushing according to claim 1, characterized in that: The multiple assembly holes are arranged at equal intervals on the retainer (31).

3. A rotating bushing according to claim 1, characterized in that: The coil fixing seat (2) is provided with a first annular edge (21) for assembling the bearing (3), and the rotating sleeve (4) is provided with a second annular edge (41) for assembling the bearing (3). The difference between the inner ring radius of the second annular edge (41) and the outer ring radius of the first annular edge (21) is matched with the diameter of the ball (32) so that the ball (32) can contact the first annular edge (21) and the second annular edge (41) at the same time.

4. A rotating bushing according to claim 3, characterized in that: The outer ring of the first annular edge (21) and / or the inner ring of the second annular edge (41) are provided with limiting components for limiting the axial position of the bearing (3).

5. A rotating bushing according to claim 4, characterized in that: The limiting component includes a first boss (22) on the outer ring of the first annular side (21) and a second boss (42) on the inner ring of the second annular side (41). The first boss (22) and the second boss (42) are located on both ends of the ball (32) in the axial direction of the bearing (3) and are in contact with the ball (32) to limit the axial position of the bearing (3).

6. A rotating bushing according to claim 5, characterized in that: The radial height of the first boss (22) is less than the radial height of the portion of the ball (32) protruding from the inner annular surface of the cage (31), and the radial height of the second boss (42) is less than the radial height of the portion of the ball (32) protruding from the outer annular surface of the cage (31).

7. A rotating bushing according to claim 4, characterized in that: The limiting component includes a groove (23) formed on the outer ring of the first annular edge (21) and / or the inner ring of the second annular edge (41), wherein the ball (32) protrudes from a portion of the structure of the cage (31) and is rotatably embedded in the groove (23) to limit the axial position of the bearing (3).

8. A rotating bushing according to claim 7, characterized in that: The groove (23) has a V-shaped cross section so that the vertical distance from the ball (32) to the bearing (3) axis is equal at different contact positions with the same groove (23).

9. A torque meter, characterized in that: Includes the rotating bushing as described in any one of claims 1-8.

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