Spindle device with torque sensor

Abstract

The present invention discloses a spindle device with a torque sensor, which includes a shaft, a first torque sensor and a second torque sensor. The shaft extends along an axial direction. The shaft includes a central section, a first side section and a second side section. The first side section and the second side section are arranged at opposite ends of the central section. The central section has a central torsional rigidity with the axial direction as the torsional axis. The first side section has a first torsional rigidity with the axial direction as the torsional axis. The second side section has a second torsional rigidity with the axial direction as the torsional axis. The first torsional rigidity is smaller than the central torsional rigidity. The second torsional rigidity is smaller than the central torsional rigidity. The first torque sensor is arranged on the first side section. The second torque sensor is arranged on the second side section.

Description

Technical Field

[0001] The invention relates to a spindle device, in particular to a spindle device with a torque sensor. Background Art

[0002] Today's electric-assisted bicycles are equipped with torque sensors to sense how much force the rider will apply to ride the bicycle. When the electric-assisted bicycle senses that the rider needs to apply a large force, the electric-assisted bicycle can convert electrical energy into kinetic energy to assist the wheel rotation. Therefore, the rider can reduce the force required to be applied. When the electric-assisted bicycle senses that the rider does not need to apply a large force, the electric-assisted bicycle can suspend the conversion of electrical energy into kinetic energy.

[0003] In road conditions such as climbing a slope, the electric-assisted bicycle converts electrical energy into kinetic energy, and the bicycle rider does not need to exert a large force to smoothly ride the bicycle. On the other hand, in road conditions such as flat ground or downhill, the bicycle rider only needs to exert a slight force to smoothly travel, so there is no need for the electric-assisted bicycle to convert electrical energy into kinetic energy, thereby saving the electric energy of the electric-assisted bicycle. Therefore, the rider of the electric-assisted bicycle can exert a moderate force to ride the bicycle in various road conditions.

[0004] However, the torque sensors installed in current electric-assisted bicycles usually have insufficient sensing accuracy and slow response speed, so they cannot immediately sense how much force the rider of the bicycle is applying when riding the bicycle. Summary of the invention

[0005] In view of the above problems, an object of the present invention is to provide a spindle device with a torque sensor, which can improve the accuracy and instantly sense the torque borne by the shaft.

[0006] One embodiment of the present invention provides a spindle device with a torque sensor, which includes a shaft, a first torque sensor and a second torque sensor. The shaft extends along an axial direction. The shaft includes a central section, a first side section and a second side section. The first side section and the second side section are arranged at opposite ends of the central section. The central section has a central torsional rigidity with the axial direction as the torsional axis. The first side section has a first torsional rigidity with the axial direction as the torsional axis. The second side section has a second torsional rigidity with the axial direction as the torsional axis. The first torsional rigidity is smaller than the central torsional rigidity. The second torsional rigidity is smaller than the central torsional rigidity. The first torque sensor is arranged on the first side section. The second torque sensor is arranged on the second side section.

[0007] According to an embodiment of the present invention, the mandrel device with a torque sensor is provided on the shaft, so that the torque sensor can improve the accuracy and instantly sense the torque borne by the shaft. Moreover, since the first torsional rigidity is smaller than the central torsional rigidity and the second torsional rigidity is smaller than the central torsional rigidity, the torque borne by the first side segment and the torque borne by the second side segment are not easy to interfere with each other. As a result, the torque measured by the first torque sensor and the torque measured by the second torque sensor are not easy to interfere with each other, and the torque borne by different side segments of the shaft can be measured individually.

[0008] The above description of the content of the present invention and the following description of the embodiments are intended to demonstrate and explain the spirit and principle of the present invention, and to provide further explanation of the claims of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a three-dimensional schematic diagram of a spindle device with a torque sensor according to an embodiment of the present invention;

[0010] Figure 2 for Figure 1 A three-dimensional schematic diagram of a shaft member;

[0011] Figure 3 for Figure 1 A schematic diagram of a spindle device with a torque sensor;

[0012] Figure 4 for Figure 3 A schematic diagram of another arrangement of magnetic members;

[0013] Figure 5 for Figure 2 A side cross-sectional schematic diagram of a shaft member;

[0014] Figure 6 For calculation Figure 5 Schematic diagram of the parameters required for the central torsional rigidity of the central segment;

[0015] Figure 7 For calculation Figure 5 A schematic diagram of parameters required for a first torsional stiffness of a first side segment;

[0016] Figure 8 For calculation Figure 5 Schematic diagram of the parameters required for the second torsional stiffness of the second side segment.

[0017] Explanation of symbols

[0018] 1…Spindle device

[0019] 10…Shaft

[0020] 11…Central section

[0021] 11a, 11b…end surface

[0022] 12…First side section

[0023] 12a, 12b…end face

[0024] 120…First groove

[0025] 13…Second side section

[0026] 13a, 13b…end surface

[0027] 130…Second groove

[0028] 14…First connection portion

[0029] 140…External tooth pattern

[0030] 15…Second connection part

[0031] 150…External tooth pattern

[0032] 20…First torque sensor

[0033] 30…Second torque sensor

[0034] 40…Circuit module

[0035] 400…Through hole

[0036] 41…Circuit board

[0037] 41a…Surface

[0038] 42…Reading unit

[0039] 43…Wireless transmission unit

[0040] 44…Electric energy unit

[0041] 441…Generator coil

[0042] 442…Magnetic parts

[0043] S…Axial DETAILED DESCRIPTION

[0044] The detailed features and advantages of the embodiments of the present invention are described in detail in the following embodiments, and the contents are sufficient to enable any person with ordinary knowledge in the art to understand the technical contents of the embodiments of the present invention and implement them accordingly. According to the contents disclosed in this specification, the claims and the drawings, any person with ordinary knowledge in the art can easily understand the relevant purposes and advantages of the present invention. The following embodiments further illustrate the viewpoints of the present invention in detail, but do not limit the scope of the present invention in any viewpoint.

[0045] In the so-called schematic diagrams of this specification, the dimensions, proportions, angles, etc. may be exaggerated for the purpose of illustration, but they are not intended to limit the present invention. Various changes can be made without violating the gist of the present invention. The up, down, front, and back directions mentioned in the description of the embodiments and the drawings are for illustration, not for limiting the present invention.

[0046] Please refer to Figure 1 and Figure 2 . Figure 1 FIG. 4 is a three-dimensional schematic diagram of a spindle device with a torque sensor according to an embodiment of the present invention. Figure 2 Draw Figure 1 A three-dimensional schematic diagram of the shaft.

[0047] like Figure 1 and Figure 2 As shown, in this embodiment, the spindle device 1 with a torque sensor includes a shaft 10 , a plurality of first torque sensors 20 , a plurality of second torque sensors 30 and a circuit module 40 .

[0048] The shaft member 10 extends along an axial direction X. The shaft member 10 includes a central section 11, a first side section 12, a second side section 13, a first connecting portion 14 and a second connecting portion 15. The first side section 12 and the second side section 13 are disposed at opposite ends of the central section 11. In the present embodiment, the first side section 12 has four first grooves 120. The direction in which the long sides of each first groove 120 extend is substantially parallel to the axial direction X. The second side section 13 has four second grooves 130. The direction in which the long sides of each second groove 130 extend is substantially parallel to the axial direction X. In other embodiments, the number of the first grooves 120 and the second grooves 130 is not limited thereto. In addition, in other embodiments, the direction in which the long sides of each first groove 120 and each second groove 130 extend may also be a direction that is not parallel to the axial direction X.

[0049] In this embodiment, the first connection portion 14 may be disposed at the outer end of the first side segment 12, and the first side segment 12 is located between the central segment 11 and the first connection portion 14. The surface of the first connection portion 14 has an external tooth pattern 140. The long side extension direction of the external tooth pattern 140 is substantially parallel to the axial direction X, but not limited thereto. The long side extension direction of the external tooth pattern 140 may also be a direction non-parallel to the axial direction X. The second connection portion 15 may be disposed at the outer end of the second side segment 13, and the second side segment 13 is located between the central segment 11 and the second connection portion 15. The surface of the second connection portion 15 has an external tooth pattern 150. The long side extension direction of the external tooth pattern 150 is substantially parallel to the axial direction X, but not limited thereto. The long side extension direction of the external tooth pattern 150 may also be a direction non-parallel to the axial direction X. The first connection portion 14 and the second connection portion 15 may be connected to the left and right cranks of the bicycle, respectively. The left and right cranks may be connected to the left and right pedals of the bicycle, respectively. In addition, in other embodiments, the first connection portion 14 and the second connection portion 15 may be connected to two arms of a robot arm respectively, and the shaft 10 may play the role of a joint of the robot arm.

[0050] The plurality of first torque sensors 20 are respectively disposed in the plurality of first grooves 120. The plurality of second torque sensors 30 are respectively disposed in the plurality of second grooves 130. Thus, the first torque sensor 20 and the second torque sensor 30 are respectively fixed in the first groove 120 and the second groove 130, and are not easy to fall off from the shaft 10. In the present embodiment, since the first side section 12 has four first grooves 120 and the long side extension direction of each first groove 120 is substantially parallel to the axial direction X, the torsional rigidity of the first side section 12 along the axial direction X can be effectively reduced, thereby improving the sensitivity of the first torque sensor 20 when measuring torque. Similarly, since the second side section 13 also has four second grooves 130 and the long side extension direction of each second groove 130 is substantially parallel to the axial direction X, the torsional rigidity of the second side section 13 along the axial direction X can be effectively reduced, thereby improving the sensitivity of the second torque sensor 30 when measuring torque. In this embodiment, the first torque sensor 20 and the second torque sensor 30 may be strain gauges, and the measured strain is converted into a torque value, but the present invention is not limited thereto.

[0051] In this embodiment, the circuit module 40 includes a circuit substrate 41, a reading unit 42, a wireless transmission unit 43 and an electric energy unit 44. The circuit substrate 41 has a through hole 400, and a first surface 41a and a second surface 41b opposite to each other. The shaft 10 passes through the through hole 400. The circuit substrate 41 is fixed to the shaft 10. When the shaft 10 rotates with the axial direction X as the rotation axis, the circuit substrate 41 can rotate with the shaft 10 with the axial direction X as the rotation axis. The reading unit 42 and the wireless transmission unit 43 are arranged on the first surface 41a of the circuit substrate 41. In this embodiment, the circuit substrate 41 surrounds the first side section 12 close to the first connecting portion 14, but is not limited thereto. In other embodiments, the circuit substrate 41 can also surround the second side section 13 close to the second connecting portion 15. In other embodiments, the circuit substrate 41 can also surround the central section 11.

[0052] In this embodiment, the reading unit 42 is disposed on the circuit substrate 41 and is electrically connected to the first torque sensor 20 and the second torque sensor 30 via the circuit substrate 41. The reading unit 42 is used to receive a first sensing signal of the first torque sensor 20 and a second sensing signal of the second torque sensor 30. The wireless transmission unit 43 is disposed on the circuit substrate 41 and is electrically connected to the reading unit 42 via the circuit substrate 41. The wireless transmission unit 43 is used to transmit the first sensing signal and the second sensing signal.

[0053] Please refer to Figure 1 and Figure 3 . Figure 3 Draw Figure 1 Schematic diagram of a spindle device with a torque sensor.

[0054] In the present embodiment, the electric energy unit 44 includes sixteen generating coils 441 and eight magnetic members 442, but is not limited thereto. In other embodiments, the number of generating coils 441 and magnetic members 442 can be designed according to actual needs. In the present embodiment, the generating coil 441 is disposed on the second surface 41b of the circuit substrate 41. The generating coil 441 is electrically connected to the reading unit 42 and the wireless transmission unit 43 via the circuit substrate 41. The shaft member 10 can rotate relative to the magnetic member 442 with the axial direction X as the rotation axis. The generating coil 441 is driven by the shaft member 10 to rotate relative to the magnetic member 442, thereby generating electric energy.

[0055] The shaft 10 drives the generator coil 441 to rotate relative to the magnetic member 442, and current can be generated in the generator coil 441 due to the magnetic effect of the current. In this way, the power unit 44 can convert kinetic energy into electrical energy. The reading unit 42 and the wireless transmission unit 43 can operate through the current generated by the generator coil 441. When the spindle device 1 is applied to a bicycle, the magnetic member 442 can also be set at an appropriate position on the bicycle frame, such as the junction of the seat tube and the rear fork of the frame. Figure 3 In the embodiment, each magnetic member 442 has an N pole and an S pole. Half of the multiple magnetic members 442 are arranged in a manner that the N pole is closer to the shaft member 10 than the S pole, that is, the N pole is set toward the shaft member 10. The other half of the multiple magnetic members 442 are arranged in a manner that the S pole is closer to the shaft member 10 than the N pole, that is, the S pole is set toward the shaft member 10. Adjacent magnetic members 442 are set with different magnetic poles facing the shaft member 10. Specifically, one of the magnetic members 442 is set with the N pole facing the shaft member 10, and the adjacent magnetic member 442 is set with the S pole facing the shaft member 10. In other words, multiple N poles and multiple S poles are arranged in a staggered manner around and toward the shaft member 10. In the embodiment, the N poles and S poles are arranged in a staggered manner around and toward the shaft member 10. Figure 3 In the figure, the magnetic lines of force are represented by a two-point chain line.

[0056] Please refer to Figure 4 . Figure 4 Draw Figure 3 Schematic diagram of another arrangement of magnetic parts. In this embodiment, multiple magnetic parts 442 are arranged in the form of a Halbach array. Among them, they are arranged in a manner with the side with stronger magnetism facing the shaft 10. Specifically, a first magnetic part 442a, a second magnetic part 442b, a third magnetic part 442c and a fourth magnetic part 442d are arranged in sequence. Moreover, the first magnetic part 442a, the second magnetic part 442b, the third magnetic part 442c and the fourth magnetic part 442d are repeated again. In this embodiment, the first magnetic part 442a is arranged with the N pole facing the shaft 10. The second magnetic part 442b is arranged with the side where the N pole and the S pole intersect toward the shaft 10, and is arranged with the N pole toward the first magnetic part 442a, and with the S pole toward the third magnetic part 442c. The third magnetic part 442c is arranged with the S pole toward the shaft 10. The fourth magnetic member 442d is disposed with the side where the S pole and the N pole intersect facing the shaft member 10, and with the S pole facing the third magnetic member 442c, and with the N pole facing the next first magnetic member 442a. Figure 4 In the figure, the magnetic lines of force are represented by a two-point chain line.

[0057] Please refer to Figure 5 . Figure 5 Draw Figure 2 A schematic side cross-sectional view of a shaft member.

[0058] In this embodiment, the central section 11 of the shaft member 10 is solid, and the first side section 12 and the second side section 13 of the shaft member 10 are hollow inside. The shape of the inner space of the first side section 12 and the second side section 13 is cylindrical. The central section 11 has a central torsional rigidity with the axial direction X as the torsional axis. The first side section 12 has a first torsional rigidity with the axial direction as the torsional axis. The second side section 13 has a second torsional rigidity with the axial direction as the torsional axis. Since the central section 11 is solid and the first side section 12 and the second side section 13 are hollow, the polar moment of inertia of the central section 11 is larger, and the polar moment of inertia of the first side section 12 and the second side section 13 is smaller. Polar moment of inertia Ip = ∫ρ 2 dA, where dA represents the unit area on the cross section, and ρ represents the distance from dA to a reference point. Generally speaking, torsional rigidity is equal to the shear modulus G multiplied by the polar moment of inertia Ip (torsional rigidity = G × Ip), so torsional rigidity is proportional to the polar moment of inertia. Therefore, the first torsional rigidity is less than the central torsional rigidity, and the second torsional rigidity is less than the central torsional rigidity.

[0059] In addition, the more the number of the first grooves 120 is, the smaller the first torsional rigidity of the first side section 12 is. The deeper the depth or the larger the size of the first groove 120 is, the smaller the first torsional rigidity of the first side section 12 is. The more the number of the second grooves 130 is, the smaller the second torsional rigidity of the second side section 13 is. The deeper the depth or the larger the size of the second groove 130 is, the smaller the second torsional rigidity of the second side section 13 is.

[0060] Please refer to Figure 6 . Figure 6 Plot calculation Figure 5 Schematic illustration of the parameters required for the central torsional stiffness of the central segment. Figure 6 In the figure, the shape of the central section 11 is shown as a cylinder, but the shape of the central section 11 is not limited thereto. The method of obtaining the central torsional rigidity of the central section 11 is described below.

[0061] like Figure 6 As shown, the central section 11 has a length LC. When the central section 11 is subjected to a moment MC, the central section 11 will rotate relative to each other at an angle θC at the two end surfaces 11a and 11b. The central torsional rigidity KC is equal to the value of the moment MC multiplied by the length LC and then divided by the angle θC (i.e., KC = MC × LC / θC, the unit of the angle is radian).

[0062] Please refer to Figure 7 . Figure 7 Plot calculation Figure 5 Schematic diagram of the parameters required for the first torsional stiffness of the first side segment. Figure 7In the figure, the shape of the first side segment 12 is shown as a cylinder, but this does not limit the shape of the first side segment 12. The following describes a method for obtaining the first torsional rigidity of the first side segment 12.

[0063] like Figure 7 As shown, the first side segment 12 has a length L1. When the first side segment 12 is subjected to a moment M1, the first side segment 12 will rotate relative to each other at an angle θ1 at the two end surfaces 12a and 12b. The first torsional rigidity K1 is equal to the moment M1 multiplied by the length L1 and then divided by the angle θ1 (i.e., K1=M1×L1 / θ1, the unit of the angle is radian).

[0064] Please refer to Figure 8 . Figure 8 Plot calculation Figure 5 Schematic diagram of the parameters required for the second torsional stiffness of the second side segment. Figure 8 In the figure, the shape of the second side segment 13 is shown as a cylinder, but the shape of the second side segment 13 is not limited thereto. The following describes a method for obtaining the second torsional rigidity of the second side segment 13.

[0065] like Figure 8 As shown, the second side segment 13 has a length L2. When the second side segment 13 is subjected to a moment M2, the second side segment 13 will rotate relative to each other at an angle θ2 at the two end surfaces 13a and 13b. The second torsional rigidity K2 is equal to the value of the moment M2 multiplied by the length L2 and then divided by the angle θ2 (i.e., K2=M2×L2 / θ2, the unit of the angle is radian). The central torsional rigidity can be more than 1.15 times the first torsional rigidity, and the central torsional rigidity can be more than 1.15 times the second torsional rigidity.

[0066] In this embodiment, since the central section 11 is solid, the first side section 12 and the second side section 13 are hollow and the shape of the inner space thereof is cylindrical, the first side section 12 and the second side section 13 respectively have the first groove 120 and the second groove 130 and the polar moments of inertia of the first side section 12 and the second side section 13 are both smaller than the polar moments of inertia of the central section 11, the first torsional rigidity is smaller than the central torsional rigidity, and the second torsional rigidity is smaller than the central torsional rigidity, but the present invention is not limited thereto. In the following paragraphs, other embodiments will be briefly described, and the first torsional rigidity can also be smaller than the central torsional rigidity, and the second torsional rigidity can be smaller than the central torsional rigidity, and the second torsional rigidity can be smaller than the central torsional rigidity by other means.

[0067] In other embodiments, the central section 11 , the first side section 12 and the second side section 13 may all be hollow, and the first side section 12 and the second side section 13 have a first groove 120 and a second groove 130 , respectively.

[0068] In other embodiments, the central section 11 , the first side section 12 and the second side section 13 may be changed to be solid, and the first side section 12 and the second side section 13 have a first groove 120 and a second groove 130 , respectively.

[0069] In other embodiments, the central section 11 is solid, the first side section 12 and the second side section 13 are hollow and the shape of the inner space thereof can be changed to a polygonal column, and the first side section 12 and the second side section 13 have a first groove 120 and a second groove 130 respectively.

[0070] In other embodiments, the central section 11 , the first side section 12 and the second side section 13 may all be hollow, and the first side section 12 and the second side section 13 may each have a plurality of dispersed recesses.

[0071] In other embodiments, the central section 11 , the first side section 12 and the second side section 13 may all be solid, and the first side section 12 and the second side section 13 may each have a plurality of dispersed recesses.

[0072] In other embodiments, the central section 11, the first side section 12 and the second side section 13 may all be solid, but the cross-sectional area of ​​the central section 11 is greater than the cross-sectional area of ​​the first side section 12, and the cross-sectional area of ​​the central section 11 is greater than the cross-sectional area of ​​the second side section 13.

[0073] Since the first torsional rigidity is smaller than the central torsional rigidity and the second torsional rigidity is smaller than the central torsional rigidity, the torsional force borne by the first side section 12 and the torsional force borne by the second side section 13 are not likely to interfere with each other. Figure 1 ) is set at the setting position between the left and right cranks of the bicycle, it can prevent the first torque applied by the left crank to the first side section 12 from transmitting too much torque to the second side section 13, thereby preventing the second torque sensor 30 from being disturbed when measuring the torque of the second side section 13. Similarly, when the spindle device 1 is set at the setting position between the left and right cranks of the bicycle, it can also prevent the second torque applied by the right crank to the second side section 13 from transmitting too much torque to the first side section 12, thereby preventing the first torque sensor 20 from being disturbed when measuring the torque of the side section 12. As a result, the first torque sensor 20 (also refer to Figure 1 ) and the torque measured by the second torque sensor 30 (also refer to Figure 1 ) are not likely to interfere with each other, and the torques borne by the first side section 12 and the second side section 13 of the shaft 10 can be measured separately. Figure 1 ) is disposed on the spindle between the left and right cranks of the bicycle, the first torque sensor 20 (also see Figure 1 ) can be regarded as the first torque caused by stepping on the left pedal on the shaft 10. Similarly, the torque measured by the second torque sensor 30 (also refer to Figure 1 ) can be regarded as the torque caused by stepping on the right pedal on the shaft 10. Therefore, in addition to comprehensively considering the total torque borne by the shaft 10, the first torque applied to the shaft 10 by the left foot stepping and the second torque applied to the shaft 10 by the right foot stepping can also be considered separately. Therefore, the technical features of the spindle device disclosed in the present invention (a spindle device in which the first torsional rigidity is less than the central torsional rigidity and the second torsional rigidity is less than the central torsional rigidity) can record the force application process of the bicycle rider when stepping on the left foot and the right foot separately. These separately recorded force application processes can be applied to the training of bicycle racers.

[0074] In summary, in a spindle device with a torque sensor according to an embodiment of the present invention, by setting the torque sensor on the shaft, the torque sensor can improve the accuracy and instantly sense the torque borne by the shaft. Moreover, since the first torsional rigidity is smaller than the central torsional rigidity and the second torsional rigidity is smaller than the central torsional rigidity, the torque borne by the first side segment and the torque borne by the second side segment are not easy to interfere with each other. As a result, the torque measured by the first torque sensor and the torque measured by the second torque sensor are not easy to interfere with each other, and the torque borne by the first side segment and the torque borne by the second side segment of the shaft can be measured individually and correctly.

Claims

1. A spindle device with a torque sensor, characterized in that: include: A shaft member extending in an axial direction, the shaft member comprising a central section, a first side section and a second side section, the first side section and the second side section being disposed at opposite ends of the central section, the central section having a central torsional rigidity with the axial direction as a torsional axis, the first side section having a first torsional rigidity with the axial direction as a torsional axis, the second side section having a second torsional rigidity with the axial direction as a torsional axis, the first torsional rigidity being smaller than the central torsional rigidity, and the second torsional rigidity being smaller than the central torsional rigidity; A first torque sensor is disposed and directly contacts the first side segment to measure a first torque of the first side segment; and The second torque sensor is disposed and directly contacts the second side segment to measure a second torque of the second side segment. 2 . The spindle device with a torque sensor as claimed in claim 1 , wherein the central torsional rigidity is greater than 1.15 times the first torsional rigidity, and the central torsional rigidity is greater than 1.15 times the second torsional rigidity.

3. The spindle device with a torque sensor as described in claim 1, wherein the polar moment of inertia of at least one cross-section of the central section is greater than the polar moment of inertia of at least one cross-section of the first side section, and the polar moment of inertia of at least one cross-section of the central section is greater than the polar moment of inertia of at least one cross-section of the second side section. 4 . The spindle device with a torque sensor as claimed in claim 3 , wherein the central section is solid, and the first side section and the second side section are hollow. 5 . The spindle device with a torque sensor as claimed in claim 4 , wherein the first side section has at least one first groove, and the second side section has at least one second groove. 6 . The spindle device with a torque sensor as claimed in claim 5 , wherein the first torque sensor is disposed in the at least one first groove, and the second torque sensor is disposed in the at least one second groove. 7 . The spindle device with a torque sensor as claimed in claim 5 , wherein an extension direction of a long side of the at least one first groove and an extension direction of a long side of the at least one second groove are substantially parallel to the axial direction.

8. The spindle device with a torque sensor as claimed in claim 3, wherein the cross-sectional area of ​​the central section is larger than the cross-sectional area of ​​the first side section, and the cross-sectional area of ​​the central section is larger than the cross-sectional area of ​​the second side section.

9. The spindle device with a torque sensor as claimed in claim 3, wherein the central section, the first side section and the second side section are all hollow, the first side section has at least one first groove, and the second side section has at least one second groove.

10. The spindle device with a torque sensor as claimed in claim 3, wherein the central section, the first side section and the second side section are all solid, the first side section has at least one first groove, and the second side section has at least one second groove.

11. The spindle device with a torque sensor as claimed in claim 3, wherein the central section, the first side section and the second side section are all hollow, and the first side section and the second side section respectively have a plurality of scattered pits. 12 . The spindle device with a torque sensor as claimed in claim 3 , wherein the central section, the first side section and the second side section are all solid, and the first side section and the second side section respectively have a plurality of dispersed pits.

13. The spindle device with a torque sensor as claimed in claim 1, further comprising a circuit module having a through hole, the shaft member passing through the through hole, and the circuit module being electrically connected to the first torque sensor and the second torque sensor.

14. A spindle device with a torque sensor as described in claim 13, wherein the circuit module includes a reading unit and a wireless transmission unit, the reading unit is electrically connected to the first torque sensor and the second torque sensor, and is used to receive a first sensing signal of the first torque sensor and a second sensing signal of the second torque sensor, and the wireless transmission unit is electrically connected to the reading unit, and is used to transmit the first sensing signal and the second sensing signal. 15 . The spindle device with a torque sensor as claimed in claim 14 , wherein the circuit module further comprises an electric energy unit electrically connected to the reading unit and the wireless transmission unit, and the electric energy unit is used to convert kinetic energy into electric energy.

16. A spindle device with a torque sensor as described in claim 15, wherein the electric energy unit includes at least one generating coil and at least one magnetic member, the at least one generating coil is fixed to the shaft member, the at least one generating coil and the shaft member rotate relative to the at least one magnetic member with the axial direction as the rotation axis, so that the at least one generating coil generates current.

17. A spindle device with a torque sensor as described in claim 16, wherein the number of the at least one magnetic member is multiple, each of the magnetic members has a north pole and an south pole, the magnetic members surround the shaft, half of the magnetic members are arranged with their north poles facing the shaft, and the other half of the magnetic members are arranged with their south poles facing the shaft, adjacent magnetic members are arranged with different magnetic poles facing the shaft, one of the magnetic members is arranged with its north pole facing the shaft, and adjacent magnetic members are arranged with its south pole facing the shaft, and the north poles and the south poles are arranged in a staggered manner around and toward the shaft.

18. A spindle device with a torque sensor as described in claim 16, wherein the number of the at least one magnetic member is a multiple of four, and the magnetic members surround the axial direction, and the magnetic members include a first magnetic member, a second magnetic member, a third magnetic member and a fourth magnetic member that are repeatedly arranged in sequence, the first magnetic member is arranged with the N pole facing the shaft member, the second magnetic member is arranged with the side where the N pole and the S pole intersect toward the shaft member, and is arranged with the N pole toward the first magnetic member, and is arranged with the S pole toward the third magnetic member, the third magnetic member is arranged with the S pole toward the shaft member, the fourth magnetic member is arranged with the side where the S pole and the N pole intersect toward the shaft member, and is arranged with the S pole toward the third magnetic member, and the N pole is arranged toward the next first magnetic member.

19. A spindle device with a torque sensor as described in claim 1, wherein the shaft member further includes a first connecting portion and a second connecting portion, the first connecting portion is arranged on the first side section, and the first side section is located between the central section and the first connecting portion, the second connecting portion is arranged on the second side section, and the second side section is located between the central section and the second connecting portion, and the surfaces of the first connecting portion and the second connecting portion respectively have external tooth patterns. 20 . The spindle device with torque sensor as claimed in claim 1 , wherein the first torque sensor and the second torque sensor are strain gauges.

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