Torque sensor

Abstract

The invention relates to a torque sensor, and the sensor comprises a sensing unit which comprises an inner ring, an outer ring, and a measurement module. The outer ring surrounds the inner ring, and the measuring module is connected with the inner ring and the outer ring. The connecting ring is arranged outside the outer ring; the inner ring of the connecting ring is connected with the outer ring, the connecting ring and the outer ring are of an integrated structure or a split structure, and the outer ring of the connecting ring is connected with the first connecting part of the tested piece; an annular groove is formed between the inner ring and the outer ring of the connecting ring; the connecting shaft is connected with the inner ring, and the connecting shaft and the inner ring are of an integrated structure or a split structure; and the connecting shaft is connected with the second connecting part of the tested piece. The torque sensor can be matched with the scene of a tubular measured piece, the torque sensor can be assembled in a pipeline with a narrow size, and the installation precision and the measurement precision are improved.

Description

Technical Field

[0001] This application relates to the field of sensor technology, and in particular to a torque sensor. Background Technology

[0002] Existing torque sensors are generally shaped like couplings, which presents assembly difficulties in some narrow pipes, resulting in low measurement accuracy.

[0003] For example, in automotive applications, systems such as stabilizer bars and electromechanical suspensions require torque sensors to measure torque. Taking stabilizer bar applications as a further example, measuring the stabilizer bar's torque with a torque sensor provides guidance for improving the control accuracy of the motor or for decoupling. The stabilizer bar's installation space is limited, assembly is difficult, and the assembly features within the stabilizer bar have tolerances that affect installation accuracy. Furthermore, the vehicle's movement transmits lateral forces to the torque sensor; all these factors affect the measurement accuracy of the torque sensor.

[0004] Therefore, there is a need for a torque sensor that can be applied to narrow pipes, has high installation accuracy, and high measurement accuracy. Summary of the Invention

[0005] Therefore, it is necessary to provide a torque sensor, the specific technical solution of which is as follows.

[0006] A torque sensor, comprising: The sensing unit includes an inner ring, an outer ring, and a measurement module; the outer ring surrounds the inner ring, and the measurement module is connected to both the inner and outer rings. A connecting ring is disposed outside the outer ring; the inner ring of the connecting ring is connected to the outer ring, and the connecting ring and the outer ring are an integral structure or a separate structure; the outer ring of the connecting ring is connected to the first connecting part of the test piece; an annular groove is formed between the inner ring and the outer ring of the connecting ring. A connecting shaft is connected to an inner ring, and the connecting shaft and the inner ring are either an integral structure or a separate structure; the connecting shaft is connected to the second connecting part of the test piece.

[0007] Furthermore, the annular groove includes a first sidewall, a bottom wall, and a second sidewall; the first sidewall, the bottom wall, and the second sidewall are connected in sequence to form a U-shaped structure with a top opening; the first sidewall is provided with a plurality of first channels, dividing the first sidewall into a plurality of blade portions; the first channel includes an opening and an extension, the opening is located at the end of the first sidewall away from the bottom wall, and the extension extends to the bottom wall; the first sidewall is connected to the test piece.

[0008] Furthermore, the annular groove is also provided with a plurality of second channels, the second channels extending along the first sidewall to the bottom wall, and the second channels are closed grooves; the second channels are offset from the first channels.

[0009] Furthermore, the measurement module includes multiple sensing beams and multiple strain gauges; the sensing beams are disposed between the outer ring and the inner ring; the sensing beams include a first surface, and the strain gauges are attached to the first surface; the first surfaces of each sensing beam are coplanar, and the first surfaces are coplanar with the end plane of the sensing unit.

[0010] Furthermore, the sensing beam also includes a second surface, which is opposite to the first surface. The second surface is provided with a reinforcing portion, and the width of the sensing beam is greater than the width of the reinforcing portion.

[0011] Furthermore, the connecting shaft is threadedly connected to the second connecting part of the test piece.

[0012] Furthermore, the connecting shaft includes a threaded section and a tightening drive section; the second connecting part of the test piece is provided with a threaded hole and a clearance part; the threaded section is threadedly connected to the threaded hole; the tightening drive section is provided with a force-applying part, and the force-applying part is located inside the clearance part.

[0013] Furthermore, a radial positioning section is provided between the threaded section and the tightening drive section, and the outer diameter of the radial positioning section is larger than the outer diameter of the threaded section to form a first stepped portion; a limiting hole is provided between the threaded hole and the clearance portion, and the inner diameter of the limiting hole is larger than the inner diameter of the threaded hole to form a second stepped portion; the radial positioning section rotates and fits against the inner wall of the limiting hole.

[0014] Furthermore, the connecting shaft is welded to the second connecting part of the test piece.

[0015] Furthermore, the connecting shaft is provided with a through hole, and the inner ring is provided with a clearance hole communicating with the through hole; the second connecting part of the test piece is provided with a positioning shaft, which is inserted into the through hole and welded to the connecting shaft.

[0016] Beneficial effects: 1. The torque sensor provided by the present invention has an inner ring of the sensing unit connected to the second connecting part of the measured component via a connecting shaft, and an outer ring of the sensing unit connected to the first connecting part of the measured component via a connecting ring, thereby realizing the assembly of the torque sensor in a narrow pipe; the connecting ring can absorb the tolerance of the first connecting part and isolate lateral crosstalk, avoiding the influence of lateral force on the measurement accuracy of the torque sensor, thus improving the measurement accuracy.

[0017] 2. The torque sensor provided by the present invention allows for a threaded connection between the connecting shaft and the second connecting part of the measured component. By providing a force-applying part on the connecting shaft and a slotted groove between the inner and outer rings, it is convenient to insert a tool into the force-applying part to drive the torque sensor to rotate, thereby making it easier to connect the connecting shaft and the measured component.

[0018] 3. The torque sensor provided by the present invention allows for welding as a connection method between the connecting shaft and the second connecting part of the measured component. This eliminates features such as the slotted groove and force-applying part found in threaded connections, increases the circuit board area, and further reduces the requirements for installation space. Moreover, the welding process between the connecting shaft and the second connecting part of the measured component can be completed simultaneously with the welding process between the connecting ring and the first connecting part of the measured component, reducing the number of process steps. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the torque sensor in Example 1; Figure 2 This is one of the schematic diagrams of a connecting ring; Figure 3 This is the second schematic diagram of the connecting ring; Figure 4 This is a schematic diagram of the sensing unit. Figure 5 This is a cross-sectional schematic diagram of the induction beam; Figure 6 This is a schematic diagram of the connecting shaft in Example 1; Figure 7 This is a cross-sectional view of the torque sensor assembled inside the test piece in Example 1; Figure 8 A schematic diagram showing a circuit board mounted on a torque sensor; Figure 9 This is a schematic diagram of the torque sensor in Example 2; Figure 10 This is a schematic diagram of the connecting shaft in Example 2; Figure 11 This is a cross-sectional view of the torque sensor assembled into the test piece in Example 2.

[0021] Explanation of reference numerals in the attached figures: 1. Sensing unit; 2. Connecting ring; 3. Connecting shaft; 4. Measured component; 5. Bridge board; 6. Circuit board; 11. Inner ring; 12. Outer ring; 13. Strain gauge; 14. Hollowed-out groove; 15. Sensing beam; 16. Reinforcing section; 111. Clearance hole; 21. Outer annular groove; 22. Inner annular groove; 211. First sidewall; 212. Bottom wall; 213. Second sidewall; 214. First channel; 215. Blade section; 216. Second channel; 31. Threaded section; 32. Radial positioning section; 33. Tightening drive section; 34. Through hole; 321. First step; 341. Third step; 342. Fourth step; 41. First connecting part; 42. Second connecting part; 43. Positioning shaft; 421. Threaded hole; 422. Limiting hole; 423. Clearance section; 424. Second step section; 431. Fifth step; 432. Sixth step. Detailed Implementation

[0022] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0023] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0026] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0027] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0028] This application claims full priority of the prior application patent with application number CN202411467477.0.

[0029] Example 1 Reference Figure 1 and Figure 7 As shown, this embodiment provides a torque sensor, including a sensing unit 1, a connecting ring 2, and a connecting shaft 3. (Refer to...) Figure 4 As shown, the sensing unit 1 includes an inner ring 11, an outer ring 12, and a measurement module. The outer ring 12 surrounds the inner ring 11, and the measurement module is connected to both the inner ring 11 and the outer ring 12.

[0030] Continue to refer to Figure 1 and Figure 7As shown, the inner ring of the connecting ring 2 is connected to the outer ring 12, and the connecting ring 2 and the outer ring 12 are either an integral structure or a separate structure. The outer ring of the connecting ring 2 is connected to the first connecting part 41 of the measured component 4; an annular groove is formed between the inner ring and the outer ring of the connecting ring 2. The annular groove formed by the connecting ring 2 enables it to have a certain degree of elasticity, which can absorb the tolerances in the processing of the first connecting part 41, improve the installation accuracy of the sensor, and when the measured component 4 is subjected to non-torsional factors such as lateral crosstalk, the connecting ring 2 can absorb non-torsional factors such as lateral crosstalk, avoid interference with the measurement results, and improve the measurement accuracy.

[0031] The connecting shaft 3 is connected to the inner ring 11, and the connecting shaft 3 and the inner ring 11 are either an integral structure or a separate structure; the connecting shaft 3 is connected to the second connecting part 42 of the test piece 4. When the torque of the test piece 4 is transmitted to the inner ring 11 and the outer ring 12, the measurement module measures the strain and outputs the corresponding torque value.

[0032] It should be noted that the connecting ring 2 and the sensing unit 1 can be an integral structure or a separate structure; in the separate structure, the connecting ring 2 is connected to the outer ring 12 of the sensing unit 1 by welding or other means. Correspondingly, the sensing unit 1 and the connecting shaft 3 can be an integral structure or a separate structure. The integral structure can reduce tolerances and improve accuracy; the separate structure can reduce the difficulty of processing.

[0033] It should be noted that, in this embodiment, the tested component 4 can be a vehicle stabilizer bar, an electromechanical suspension, or other tubular structures. The structures of the first connecting portion 41 and the second connecting portion 42 of the tested component 4 correspond to the structures of the connecting ring 2 and the connecting shaft 3, respectively. For example, these connecting portions can be hole structures, shaft structures, or other corresponding structures. In this embodiment, the first connecting portion 41 and the second connecting portion 42 are located on the same tested component, and the axial height positions of the first connecting portion 41 and the second connecting portion 42 of the tested component 4 are different.

[0034] The torque sensor provided in this embodiment has an inner ring 11 of sensing unit 1 connected to the second connecting part 42 of the measured component 4 via a connecting shaft 3, and an outer ring 12 of sensing unit 1 connected to the first connecting part 41 of the measured component 4 via a connecting ring 2, thereby realizing the assembly of the torque sensor in a narrow pipe. The connecting ring 2 can absorb the tolerance of the first connecting part 41 and isolate lateral crosstalk, avoiding the influence of lateral force on the measurement accuracy of the torque sensor and improving the measurement accuracy.

[0035] Specifically, the connecting ring 2 includes multiple annular grooves arranged radially, with adjacent grooves having the same or opposite opening directions. In this embodiment, two annular grooves are provided: an inner annular groove 22 and an outer annular groove 21 arranged radially. The inner annular groove 22 and the outer annular groove 21 have opposite opening directions, making the axial cross-section of the connecting ring 2 S-shaped. By providing multiple annular grooves and setting adjacent grooves with opposite opening directions, the elasticity of the connecting ring 2 can be improved, making the elastic deformation distribution of the connecting ring 2 more uniform, thereby improving the ability to absorb tolerances and isolate lateral crosstalk.

[0036] Specifically, in this embodiment, the outer annular groove 21 includes a first sidewall 211, a bottom wall 212, and a second sidewall 213; the first sidewall 211, bottom wall 212, and second sidewall 213 are sequentially connected to form a U-shaped structure with a top opening; the first sidewall 211 is provided with a plurality of first channels 214, dividing the first sidewall 211 into a plurality of blade portions 215. By providing the first channels 214, the elasticity of the connecting ring 2 can be further improved. The first channel 214 includes an opening and an extension; the opening is located at the end of the first sidewall 211 away from the bottom wall 212, and the extension extends to the bottom wall 212; the first sidewall 211 is connected to the test piece 4. When the torque sensor is installed on the test piece 4, each blade portion 215 can deform when absorbing the tolerance of the first connecting portion 41. By setting the first channel 214 to divide the first sidewall 211 into multiple blade portions 215, not only can the elasticity of the connecting ring 2 be improved, but also the stress concentration caused by the connecting ring 2 absorbing the tolerance of the first connecting portion 41 can be reduced, thereby avoiding the impact on the measurement results.

[0037] Specifically, the outer ring groove 21 is further provided with a plurality of second channels 216, which extend along the first side wall 211 to the bottom wall 212, and the second channels 216 are closed grooves; the first channel 214 is offset from the second channels 216. By setting the second channels 216, the elasticity of the connecting ring 2 is further improved, and the second channels 216 are designed as closed grooves to reduce the impact on the stiffness of the connecting ring 2.

[0038] It should be noted that in this embodiment, only the first channel 214 and the second channel 216 are provided on the outer ring groove 21, while no channel is provided on the inner ring groove 22, so that the inner ring groove 22 remains intact. During the installation of the torque sensor, the sensing unit 1 and the connecting ring 2 can be an integral structure or a pre-assembled integral structure. During installation, the tolerance of the first connecting part 41 of the measured component 4 is mainly compensated. Therefore, the corresponding channel is only provided on the outer ring groove 21 to take into account both the rigidity and elasticity of the connecting ring 2.

[0039] Specifically, in this embodiment, the first channel 214 and the second channel 216 are evenly arranged around the axis of the connecting ring 2, and the specific number can be selected according to the design performance of the connecting ring 2.

[0040] It should be noted that in this embodiment, the connecting ring 2 and the first connecting portion 41 of the tested component 4 are connected by welding. In other embodiments, bonding or other connection methods can also be used. In this embodiment, the connecting ring 2 is preferably formed by stamping. In other embodiments, casting or other processing methods can also be used.

[0041] Specifically, continue to refer to Figure 4 As shown, the measurement module includes multiple sensing beams 15 and multiple strain gauges 13. The sensing beams 15 are positioned between an outer ring 12 and an inner ring 11, and the strain gauges 13 are attached to the sensing beams 15. Specifically, a slot 14 is formed between the inner ring 11 and the outer ring 12, and slots 14 are formed on both sides of the sensing beams 15, thus forming a beam structure. The inner ring 11 and the outer ring 12 transmit torque to the sensing beams 15, causing strain in the sensing beams 15. The strain gauges 13 then strain and generate strain signals, which are converted into torque-related electrical signals by components and output externally. Each sensing beam 15 includes a first surface, and the strain gauges 13 are attached to the first surface. The first surfaces of each sensing beam 15 are coplanar, and the first surface is coplanar with the end plane of the sensing unit 1, which is the plane of the outermost end of the sensing unit 1 along the axial direction. The method facilitates the batch application of the strain gauge 13 attachment medium before attaching the strain gauge 13, which improves the attachment efficiency, enables mass production, and reduces production costs.

[0042] Specifically, refer to Figure 5 As shown, the sensing beam 15 further includes a second surface opposite to the first surface. The second surface is provided with a reinforcing portion 16, and the width of the sensing beam 15 is greater than the width of the reinforcing portion 16. By providing the reinforcing portion 16, the resistance of the sensing beam 15 to deformation in the axial and radial directions of the sensing unit 1 can be improved, allowing the sensing beam 15 to be thinner, thus making it more sensitive to torque and reducing interference caused by non-torque factors, further improving measurement accuracy. It should be noted that in this embodiment, the sensing beam 15 and the reinforcing portion 16 form a T-shaped structure; in other embodiments, the sensing beam 15 and the reinforcing portion 16 may also form an I-shape or other shapes.

[0043] In this embodiment, 2-8 sensing beams 15 are provided, preferably 4 sensing beams 15. A strain gauge 13 is attached to a portion of each sensing beam 15. These strain gauges 13 are connected by wires to form a Wheatstone bridge. The strain of the sensing beam 15 is measured by the strain gauges 13, and the result is conditioned by subsequent circuitry to output an electrical signal related to torque.

[0044] Specifically, the strain gauge 13 on the sensing beam 15 is located in the middle region of the sensing beam 15, and the sensing direction of the strain gauge 13 is at 45° with the radial direction of the sensing beam 15, thus being consistent with the strain direction caused by the torque.

[0045] In this embodiment, the connecting shaft 3 is threadedly connected to the second connecting portion 42 of the test piece 4. In other embodiments, the connecting shaft 3 may also be welded to the second connecting portion 42 of the test piece 4, or connected by an interference fit, or by other means.

[0046] Reference Figure 6-7 As shown, the connecting shaft 3 includes a threaded section 31 and a tightening drive section 33. The second connecting portion 42 of the test piece 4 is provided with a threaded hole 421 and a clearance portion 423. The threaded section 31 is threadedly connected to the threaded hole 421; the tightening drive section 33 is provided with multiple force-applying portions, which are located within the clearance portion 423. During torque sensor assembly, a tool is inserted through the slot 14 into the force-applying portion to drive the torque sensor to rotate, thereby facilitating the connection of the connecting shaft 3 to the test piece 4. In this embodiment, the force-applying portion can be a toothed structure or other types of structures.

[0047] Specifically, a radial positioning section 32 is provided between the threaded section 31 and the tightening drive section 33. The outer diameter of the radial positioning section 32 is larger than the outer diameter of the threaded section 31, forming a first stepped portion 321. A limiting hole 422 is provided between the threaded hole 421 and the clearance portion 423. The inner diameter of the limiting hole 422 is larger than the inner diameter of the threaded hole 421, forming a second stepped portion 424. The radial positioning section 32 rotates and fits against the inner wall of the limiting hole 422. By providing a radial positioning section 32 on the connecting shaft 3 to cooperate with the limiting hole 422 on the measured part 4, the torque sensor can be radially positioned, improving the installation accuracy.

[0048] Specifically, refer to Figure 1 and Figure 8 As shown, in Figure 1 The circuit board 6 is concealed within the outer ring 12. A bridge board 5 is also mounted on the upper surface of the outer ring 12, and the circuit board 6 is mounted above the bridge board 5. The bridge board 5 is used to mount electrical components and to transmit or process the strain signals measured by the strain gauge 13. Because a tool is needed to pass through the slot 14 when installing the torque sensor, the bridge board 5 cannot obstruct the slot 14, hence its relatively small size. When not many electrical components are required, all electrical components can be mounted on the bridge board 5 without the need for an additional circuit board 6. When a large number of electrical components are required, the limited size of the bridge board 5 results in insufficient installation space, necessitating the installation of an additional circuit board 6, on which the remaining electrical components are mounted.

[0049] Installation process: First, assemble the sensing unit 1, connecting ring 2, connecting shaft 3, bridge board 5 and other structures to form a torque sensor; insert the connecting shaft 3 into the second connecting part 42, use a tool to extend into the force application part to drive the connecting shaft 3 to rotate, so that the connecting shaft 3 is threadedly connected to the second connecting part 42; use a laser to weld the connecting ring 2 to the first connecting part 41; finally, cover it with the circuit board 6.

[0050] Example 2 Reference Figure 9 and Figure 11 As shown, this embodiment provides a torque sensor, which differs from embodiment 1 in that the connecting shaft 3 is welded to the second connecting part 42 of the measured component 4 in this embodiment.

[0051] Specifically, refer to Figure 10 As shown, the connecting shaft 3 has a through hole 34, the inner ring 11 has a clearance hole 111 communicating with the through hole 34, and the second connecting part 42 of the tested component 4 has a positioning shaft 43. The positioning shaft 43 is inserted into the through hole 34 and welded to the connecting shaft 3. During welding, a welding tool can be passed through the clearance hole 111 and then the connecting shaft 3 and the positioning shaft 43 can be welded.

[0052] Specifically, the through hole 34 is provided with a third step 341 and a fourth step 342, and the positioning shaft 43 is provided with a fifth step 431 corresponding to the third step 341 and a sixth step 432 corresponding to the fourth step 342; positioning by each step can improve the installation accuracy of the torque sensor.

[0053] It should be noted that since there is no need to pass the tool through the cutout 14, the electrical bridge board 5 can cover the cutout, making the electrical bridge board 5 larger and able to install more electrical components, thereby eliminating the need for the circuit board 6 in Embodiment 1.

[0054] Installation process: First, assemble the sensing unit 1, connecting ring 2, connecting shaft 3, bridge plate 5 and other structures to form a torque sensor; insert the torque sensor into the second connecting part 42, so that the positioning shaft 43 is inserted into the through hole 34 and positioned; weld the connecting shaft 3 and the positioning shaft 43, and weld the connecting ring 2 and the first connecting part 41.

[0055] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A torque sensor, characterized in that, include: The sensing unit includes an inner ring, an outer ring, and a measurement module; the outer ring surrounds the inner ring, and the measurement module is connected to both the inner and outer rings. A connecting ring is disposed outside the outer ring; the inner ring of the connecting ring is connected to the outer ring, and the connecting ring and the outer ring are an integral structure or a separate structure; the outer ring of the connecting ring is connected to the first connecting part of the test piece; an annular groove is formed between the inner ring and the outer ring of the connecting ring. A connecting shaft is connected to an inner ring, and the connecting shaft and the inner ring are either an integral structure or a separate structure; the connecting shaft is connected to the second connecting part of the test piece.

2. A torque sensor according to claim 1, characterized in that, The annular groove includes a first sidewall, a bottom wall, and a second sidewall; the first sidewall, the bottom wall, and the second sidewall are connected in sequence to form a U-shaped structure with a top opening; the first sidewall is provided with a plurality of first channels, dividing the first sidewall into a plurality of blade portions; the first channel includes an opening portion and an extension portion, the opening portion is located at the end of the first sidewall away from the bottom wall, and the extension portion extends to the bottom wall; the first sidewall is connected to the test piece.

3. A torque sensor according to claim 2, characterized in that, The annular groove is also provided with a plurality of second channels, which extend along the first side wall to the bottom wall and are closed channels; the second channels are offset from the first channels.

4. A torque sensor according to claim 1, characterized in that, The measurement module includes multiple sensing beams and multiple strain gauges; the sensing beams are disposed between the outer ring and the inner ring; the sensing beams include a first surface, and the strain gauges are attached to the first surface; the first surfaces of each sensing beam are coplanar, and the first surfaces are coplanar with the end plane of the sensing unit.

5. A torque sensor according to claim 4, characterized in that, The sensing beam also includes a second surface, which is opposite to the first surface. The second surface is provided with a reinforcing portion, and the width of the sensing beam is greater than the width of the reinforcing portion.

6. A torque sensor according to claim 1, characterized in that, The connecting shaft is threadedly connected to the second connecting part of the test piece.

7. A torque sensor according to claim 6, characterized in that, The connecting shaft includes a threaded section and a tightening drive section; the second connecting part of the test piece is provided with a threaded hole and a clearance part; the threaded section is threadedly connected to the threaded hole; the tightening drive section is provided with a force-applying part, which is located inside the clearance part.

8. A torque sensor according to claim 7, characterized in that, A radial positioning section is provided between the threaded section and the tightening drive section. The outer diameter of the radial positioning section is larger than the outer diameter of the threaded section, forming a first stepped portion. A limiting hole is provided between the threaded hole and the clearance portion. The inner diameter of the limiting hole is larger than the inner diameter of the threaded hole, forming a second stepped portion. The radial positioning section rotates and fits against the inner wall of the limiting hole.

9. A torque sensor according to claim 1, characterized in that, The connecting shaft is welded to the second connecting part of the test piece.

10. A torque sensor according to claim 9, characterized in that, The connecting shaft is provided with a through hole, and the inner ring is provided with a clearance hole communicating with the through hole; the second connecting part of the test piece is provided with a positioning shaft, which is inserted into the through hole and welded to the connecting shaft.

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