Torque detection device

Abstract

A torque detection device is provided with a first yoke (361) and a first magnetic guide member (71). A first opposing portion (711) of the first magnetic guide member (71) overlaps a projected first yoke annular portion (370) of the first yoke (361) when the first yoke annular portion (370) is projected in the axial direction (Da). In addition, the first opposing portion (711) overlaps a projected inner surface (422) of the second cylindrical portion (402) when the inner surface (422) is projected in the axial direction (Da). A minimum distance from the first opposing portion (711) to the inner surface (422), which is a housing distance (Lch), is greater than a minimum distance from the first opposing portion (711) to the first yoke annular portion (370), which is a yoke distance (Lcy).

Description

[0001] Cross-references to related applications

[0002] This application is based on Japanese Patent Application No. 2021-136583, filed on August 24, 2021, the contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to a torque detection device. Background Technology

[0004] Conventionally, as described in Patent Document 1, a detection device is known that includes a magnetic flux guiding component, a magnetic sensor, a housing, a cover, and an outer casing. The magnetic flux guiding component and the magnetic sensor are housed within the housing. Furthermore, one end of the housing is inserted into the cover. Moreover, the end of the cover is formed in a rectangular shape. Additionally, a hole formed in the outer casing is formed in a rectangular shape corresponding to the shape of the end of the cover. The end of the cover is inserted into the hole in the outer casing.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2020-008547 Summary of the Invention

[0008] According to the inventors' research, in the detection device described in Patent Document 1, because the opening of the outer casing and the cover are corresponding rectangular shapes, the cover is close to the outer casing. Therefore, the end of the casing inserted into the cover is close to the outer casing, and consequently, the magnetic flux guiding component and magnetic sensor housed in the casing are close to the outer casing. Therefore, if static electricity is generated during the manufacturing or use of the detection device, the discharge current generated by this static electricity easily flows to the outer casing via the magnetic flux guiding component and magnetic sensor. Therefore, in the detection device described in Patent Document 1, magnetic sensor malfunctions or failures are easily generated, and ESD resistance is reduced. Furthermore, ESD is an abbreviation for Electrostatic Discharge.

[0009] The purpose of this disclosure is to provide a torque detection device that improves ESD resistance.

[0010] According to one aspect of this disclosure, a torque detection device is provided that detects torque generated in a detection object, comprising: a magnet that generates a magnetic field and rotates with the detection object; a rotating body that rotates with the detection object; a yoke having an annular portion and a claw portion, the annular portion being annular and rotating with the rotating body, the claw portion being protruding axially from the annular portion toward the rotating body and facing the magnet in a direction orthogonal to the axial direction, and changing the magnetic field generated by the magnet by rotating with the annular portion; a magnetic detection unit that detects the strength of the magnetic field corresponding to the torque and changing by rotating the claw portion; and a guiding member that guides the magnetic detection unit towards the magnetic detection unit. The measuring part guides a magnetic field that changes by rotating the claw part; the housing houses the magnetic sensing part and has a bottomed cylindrical component support part that supports the guiding part by covering the guiding part; and the outer shell has a first cylindrical part that is formed as a cylindrical part extending axially and houses a magnet, a rotating body and a yoke, and a second cylindrical part that is formed as a cylindrical part extending in a direction orthogonal to the axial direction and houses the component support part; the guiding part has an opposing part that overlaps with the projected annular part when the annular part is projected axially and overlaps with the projected inner surface when the inner surface of the second cylindrical part is projected axially, and the minimum distance from the opposing part to the inner surface is greater than the minimum distance from the opposing part to the annular part.

[0011] Therefore, the magnetic detection section and the guiding component are located further away from the inner surface of the second cylindrical portion of the housing than the annular portion of the yoke. Consequently, even if static electricity is generated during the manufacturing or use of the torque detection device, the discharge current generated by this static electricity is unlikely to flow through the magnetic detection section and the guiding component to the housing. Therefore, ESD resistance is improved in the torque detection device.

[0012] Furthermore, the parenthesized reference symbols used to annotate each constituent element, etc., represent an example of the correspondence between that constituent element, etc., and the specific constituent elements, etc., described in the embodiments described later. Attached Figure Description

[0013] Figure 1 This is a structural diagram of a steering system using the torque detection device of the first embodiment.

[0014] Figure 2 This is an exploded 3D view of a part of the steering system.

[0015] Figure 3 This is a cross-sectional view of the torque detection device.

[0016] Figure 4 From Figure 3 The figure observed by IV.

[0017] Figure 5 yes Figure 3 VV-line sectional view.

[0018] Figure 6yes Figure 3 Enlarged view of section VI.

[0019] Figure 7 yes Figure 3 Enlarged view of Part VII.

[0020] Figure 8 This is a perspective view of the sensor housing and terminal housing of the torque detection device.

[0021] Figure 9 yes Figure 5 Enlarged view of section IX.

[0022] Figure 10 This is a side view showing the neutral state of the magnet, the first yoke, and the second yoke of the torque sensor.

[0023] Figure 11 This is a side view of the magnet of the torque sensor, the first yoke, and the second yoke when the steering wheel of the steering system is rotated.

[0024] Figure 12 This is a side view of the magnet of the torque sensor, the first yoke, and the second yoke when the steering wheel is rotated.

[0025] Figure 13 This is a cross-sectional view of the torque sensor according to the second embodiment.

[0026] Figure 14 This is a cross-sectional view of the torque sensor according to the third embodiment.

[0027] Figure 15 This is a cross-sectional view of the torque sensor according to the fourth embodiment.

[0028] Figure 16 This is a cross-sectional view of the torque sensor according to the fifth embodiment.

[0029] Figure 17 This is a 3D view of the sensor housing and terminal housing of the torque sensor.

[0030] Figure 18 This is a cross-sectional view of the torque sensor according to the sixth embodiment.

[0031] Figure 19 This is a cross-sectional view of the torque sensor according to the seventh embodiment.

[0032] Figure 20 This is a cross-sectional view of the torque sensor according to the eighth embodiment.

[0033] Figure 21 This is an external view of the torque sensor according to the ninth embodiment.

[0034] Figure 22This is a perspective view of the sensor housing and terminal housing of the torque sensor according to the tenth embodiment.

[0035] Figure 23 This is a 3D view of the housing of the torque sensor.

[0036] Figure 24 This is a perspective view of the sensor housing and terminal housing of the torque sensor according to the eleventh embodiment.

[0037] Figure 25 This is a 3D view of the housing of the torque sensor.

[0038] Figure 26 This is a cross-sectional view of a torque sensor in another embodiment. Detailed Implementation

[0039] Hereinafter, embodiments will be described with reference to the accompanying drawings. Furthermore, in the various embodiments described below, the same or equivalent parts will be labeled with the same reference numerals, and their descriptions will be omitted.

[0040] (First Implementation)

[0041] The torque detection device of this embodiment is used, for example, in the steering system 1 of a vehicle. First, the steering system 1 will be described.

[0042] Steering system 1 assists in steering to change the direction of wheels 17. Specifically, as follows: Figure 1 and Figure 2 As shown, the steering system 1 includes a steering wheel 5, a first steering shaft 11, a torsion bar 13, and a second steering shaft 12. Additionally, the steering system 1 includes a pivot pin 14, a pinion 15, a rack and pinion shaft 16, a wheel 17, a torque sensor 25, a motor control device 18, a motor 19, and a reduction gear 20.

[0043] like Figure 1 As shown, the steering wheel 5 is rotated by the vehicle's driver or autonomous driving system.

[0044] The first steering shaft 11 is connected to the steering wheel 5. Therefore, the first steering shaft 11 rotates together with the steering wheel 5.

[0045] Torsion bar 13 is connected to the first steering shaft 11. Therefore, torsion bar 13 rotates together with steering wheel 5 and the first steering shaft 11.

[0046] The second steering shaft 12 is connected to the torsion bar 13. Therefore, the torsion bar 13 rotates together with the steering wheel 5, the first steering shaft 11, and the torsion bar 13.

[0047] like Figure 2As shown, the pin 14 is inserted into a hole formed in the first steering shaft 11 and into a hole in the torsion bar 13 corresponding to the hole in the first steering shaft 11. This secures the first steering shaft 11 and the torsion bar 13. Similarly, the pin 14 is inserted into a hole formed in the second steering shaft 12 and into a hole in the torsion bar 13 corresponding to the hole in the second steering shaft 12. This secures the second steering shaft 12 and the torsion bar 13.

[0048] like Figure 1 As shown, pinion 15 is connected to the second steering shaft 12. Furthermore, pinion 15 meshes with rack shaft 16, which will be described later. Moreover, pinion 15 converts the rotational motion of the second steering shaft 12 into the linear motion of rack shaft 16.

[0049] The rack shaft 16 is connected to the wheel 17 via a tie rod (not shown). Furthermore, the rack shaft 16 changes the direction of the wheel 17 by performing linear motion.

[0050] A portion of a torsion bar 13 is inserted into the torque sensor 25. Furthermore, the torque sensor 25 corresponds to a torque detection device, detecting a signal corresponding to the torque generated in the torsion bar 13 by the rotation of the steering wheel 5. Thus, the torque sensor 25 detects the steering torque. Moreover, the torque sensor 25 outputs a signal corresponding to the detected steering torque to the motor control device 18, which will be described later. Details of the torque sensor 25 will be described later. Furthermore, the steering torque is the torque applied when the steering wheel 5 is rotated.

[0051] The motor control device 18 is primarily composed of a microcomputer or similar component, and includes a CPU, ROM, flash memory, RAM, I / O, drive circuitry, and a bus connecting these components. Furthermore, the motor control device 18 executes a program stored in the ROM. As a result, the motor control device 18 calculates the rotation angle of the motor 19 (described later). Moreover, the motor control device 18 calculates the steering torque based on a signal corresponding to the steering torque from the torque sensor 25. Finally, based on the calculated rotation angle and steering torque of the motor 19, the motor control device 18 controls the rotation of the motor 19 (described later).

[0052] Motor 19 rotates based on the output from motor control device 18. As a result, motor 19 generates torque.

[0053] The reduction gear 20 is connected to the motor 19 and the second steering shaft 12. Furthermore, the reduction gear 20 reduces the rotational speed of the motor 19 and transmits the torque generated by the motor 19 to the second steering shaft 12. This assists in steering for changing the direction of the wheels 17.

[0054] The steering system 1 is configured as described above. Next, the structure of the torque sensor 25 will be explained.

[0055] like Figures 2-9 As shown, the torque sensor 25 includes a magnet 30, a rotating body 35, a first yoke 361, a second yoke 362, a fixing sleeve 354, and a housing 40. Additionally, the torque sensor 25 includes a substrate 60, a first magnetic detection unit 61, a second magnetic detection unit 62, a first magnetic guiding member 71, a second magnetic guiding member 72, a sensor housing 75, an elastic member 80, a terminal 85, and a terminal housing 90.

[0056] like Figure 2 As shown, the magnet 30 is formed in a ring shape. Furthermore, the magnet 30 is connected to the end of the first steering shaft 11. A portion of a torsion bar 13 is inserted into the hole of the magnet 30. Additionally, the axis of the magnet 30 and the axis of the torsion bar 13 are located on the same axis. Therefore, the magnet 30 rotates together with the first steering shaft 11 about the axis of the torsion bar 13. Moreover, the magnet 30 is magnetized in a manner in which the magnetic poles alternately reverse in the direction of rotation of the magnet 30.

[0057] like Figure 3 As shown, the rotating body 35 is formed in a cylindrical shape. Furthermore, the axis of the rotating body 35 and the axis of the magnet 30 are located on the same axis. Therefore, the axes of the rotating body 35, the magnet 30, and the torsion bar 13 are all on the same axis.

[0058] For convenience, the radial direction of the rotating body 35 will be described as radial only. Similarly, the axial direction Da of the rotating body 35 will be described as axial only. Furthermore, the circumferential direction centered on the axis of the rotating body 35 will be described as circumferential only.

[0059] like Figure 2 and Figure 3 As shown, the first yoke 361 is formed into a cylindrical shape from a soft magnetic material. In addition, the first yoke 361 includes a first yoke annular portion 370 and a plurality of first yoke claw portions 372.

[0060] The first yoke annular portion 370 is formed in a circular shape. In addition, a portion of the first yoke annular portion 370 is inserted into a hole in the radially extending rotating body 35.

[0061] The first yoke claw portion 372 protrudes axially Da from the inner side of the first yoke annular portion 370. Furthermore, the first yoke claw portion 372 is formed into a tapered shape whose width decreases from the inner side of the first yoke annular portion 370 towards the front end. Moreover, the first yoke claw portion 372 is connected to the inner surface of the rotating body 35. Additionally, the first yoke claw portion 372 is radially opposed to the outer surface of the magnet 30. Furthermore, because the holes in the rotating body 35 are formed at predetermined intervals along the circumferential direction, the first yoke claw portions 372 are also formed at predetermined intervals along the circumferential direction.

[0062] Like the first yoke 361, the second yoke 362 is formed into a ring shape from a soft magnetic material. Furthermore, the second yoke 362 is integrally formed with, for example, the rotating body 35 and the first yoke 361. Moreover, the second yoke 362 includes a second yoke ring portion 380 and a plurality of second yoke claw portions 382.

[0063] The second yoke annular portion 380 is formed in a circular shape. In addition, a portion of the second yoke annular portion 380 is inserted into a hole in the radially extending rotating body 35.

[0064] The second yoke claw portion 382 protrudes axially Da from the inner side of the second yoke annular portion 380. Furthermore, the second yoke claw portion 382 is formed into a pointed shape whose width decreases from the inner side of the second yoke annular portion 380 towards the front end. Moreover, the second yoke claw portion 382 is connected to the inner surface of the rotating body 35. Additionally, the second yoke claw portion 382 is radially opposed to the outer surface of the magnet 30. Furthermore, because the holes in the rotating body 35 are formed at predetermined intervals along the circumferential direction, the second yoke claw portions 382 are also formed at predetermined intervals along the circumferential direction. Furthermore, the second yoke claw portions 382 are disposed between adjacent first yoke claw portions 372. Therefore, the first yoke claw portions 372 and the second yoke claw portions 382 are alternately arranged in the circumferential direction.

[0065] The fixing sleeve 354 is formed in a cylindrical shape. Furthermore, the fixing sleeve 354 is connected to the inner surface of the rotating body 35. Moreover, the fixing sleeve 354 is connected to the second steering shaft 12. Therefore, the rotating body 35 rotates together with the second steering shaft 12.

[0066] like Figures 3-5 As shown, the outer casing 40 has a first cylindrical portion 401 and a second cylindrical portion 402.

[0067] The first cylindrical portion 401 is formed as a cylinder extending along the axial direction Da. In addition, the first cylindrical portion 401 includes a first space 411. The first space 411 houses the rotating body 35, the first yoke 361, the second yoke 362, and the fixing sleeve 354.

[0068] The second cylindrical portion 402 is formed as a radially extending cylindrical shape. Furthermore, the second cylindrical portion 402 is radially connected to the first cylindrical portion 401. The second cylindrical portion 402 includes a second space 412, a third space 413, a housing protrusion 403, and a housing hole 404. The second space 412 is connected to the first space 411. The second space 412 is circular in cross-section when the second cylindrical portion 402 is cut along the axial direction Da. The third space 413 is connected to the second space 412. The third space 413 is circular in cross-section when the second cylindrical portion 402 is cut along the axial direction Da. The housing protrusion 403 protrudes radially outward from the end face 406 of the second cylindrical portion 402 on the side opposite to the first cylindrical portion 401. The housing hole 404 is a hole for securing the second cylindrical portion 402 and the sensor housing 75 (described later).

[0069] Substrate 60 is a printed circuit board. A first magnetic detection unit 61 is mounted on substrate 60. The first magnetic detection unit 61 may include, for example, a Hall element or an MR element (not shown). The first magnetic detection unit 61 uses these elements to detect the strength of an axial magnetic field (Da) applied to it. Furthermore, the first magnetic detection unit 61 outputs a signal corresponding to the detected magnetic field strength to the motor control device 18. A second magnetic detection unit 62 is mounted on substrate 60. The second magnetic detection unit 62 may include, for example, a Hall element or an MR element (not shown). The second magnetic detection unit 62 uses these elements, similarly to the first magnetic detection unit 61, to detect the strength of an axial magnetic field (Da) applied to it. Furthermore, the second magnetic detection unit 62 outputs a signal corresponding to the detected magnetic field strength to the motor control device 18. MR is an abbreviation for Magneto Resistive.

[0070] The first magnetic guiding component 71 is formed of a soft magnetic material. Additionally, as... Figure 2 , Figure 3 , Figures 5-7 As shown, the first magnetic guiding member 71 has a first opposing portion 711, a first intermediate portion 715, and a second opposing portion 712. The first opposing portion 711 is opposed to the first yoke annular portion 370 in the axial direction Da. Furthermore, when the first yoke annular portion 370 is projected along the axial direction Da, the first opposing portion 711 overlaps with the projected first yoke annular portion 370. Moreover, the first opposing portion 711 is formed as a plate extending radially. The first intermediate portion 715 is connected to the first opposing portion 711. Furthermore, the first intermediate portion 715 is formed as a plate extending in a direction intersecting both the axial direction Da and the radial direction. The second opposing portion 712 is connected to the side of the first intermediate portion 715 opposite to the first opposing portion 711. Additionally, the second opposing portion 712 is opposed to the first magnetic detection portion 61 and the second magnetic detection portion 62 in the axial direction Da.

[0071] The second magnetic guiding member 72 is formed of a soft magnetic material. Furthermore, the second magnetic guiding member 72 has a third opposing portion 723, a second intermediate portion 725, and a fourth opposing portion 724. The third opposing portion 723 is opposed to the second yoke-shaped portion 380 along the axial direction Da. Additionally, when the second yoke-shaped portion 380 is projected along the axial direction Da, the third opposing portion 723 overlaps with the projected second yoke-shaped portion 380. Moreover, the third opposing portion 723 is formed as a plate extending radially. The second intermediate portion 725 is connected to the third opposing portion 723. Furthermore, the second intermediate portion 725 is formed as a plate extending in a direction intersecting both the axial direction Da and the radial direction. The fourth opposing portion 724 is connected to the side of the second intermediate portion 725 opposite to the third opposing portion 723. Furthermore, the fourth opposing portion 724 is inserted into a hole in the substrate 60. Thus, the fourth opposing portion 724 is opposed to the first magnetic detection portion 61 and the second magnetic detection portion 62 along the axial direction Da.

[0072] The sensor housing 75 is formed of resin or the like. Additionally, as... Figures 3-8 As shown, the sensor housing 75 has a flange portion 76, an insertion portion 77, and a component support portion 78.

[0073] The flange portion 76 includes a flange cylindrical portion 760, a flange hole 761, a rotation-limiting flange protrusion 762, and a positioning flange protrusion 763. The flange cylindrical portion 760 is formed in a rhomboid shape and extends in a direction orthogonal to the axial direction Da, thereby housing a portion of the substrate 60 and a portion of the terminal 85 (described later). Furthermore, the flange cylindrical portion 760 and the end face 406 of the second cylindrical portion 402 are radially opposed. The flange hole 761 is formed in the flange cylindrical portion 760 and corresponds to the housing hole 404. The sensor housing 75 and the housing 40 are fixed by inserting screws or bolts (not shown) into the flange hole 761 and the housing hole 404.

[0074] Two rotation-limiting flange protrusions 762 are formed, protruding from the flange cylinder portion 760 toward the axial direction Da. In addition, the housing protrusion 403 is located between the rotation-limiting flange protrusions 762.

[0075] The positioning flange protrusion 763 protrudes axially toward Da from the side of the flange tube portion 760 opposite to the rotation limiting flange protrusion 762.

[0076] The insertion portion 77 is radially connected to the flange portion 76 and is inserted into the third space 413 of the second cylindrical portion 402. Furthermore, the insertion portion 77 is formed in a cylindrical shape to accommodate a portion of the substrate 60 and a portion of the first magnetic detection portion 61. The insertion portion 77 also includes a recess 771. An elastic member 80, described later, is inserted into the space formed by this recess 771. Additionally, the end of the insertion portion 77 faces the end of the rotating body 35, the end of the first yoke ring portion 370, and the end of the second yoke ring portion 380 in the direction extending from the second cylindrical portion 402. Therefore, in the direction extending from the second cylindrical portion 402, a space is formed between the end of the insertion portion 77 and the end of the rotating body 35, the end of the first yoke ring portion 370, and the end of the second yoke ring portion 380.

[0077] The component support portion 78 is radially connected to the side of the insertion portion 77 opposite to the flange portion 76. Furthermore, the component support portion 78 is inserted into the second space 412 of the second cylindrical portion 402. Moreover, the component support portion 78, being quadrilateral and bottomed cylindrical, accommodates a portion of the substrate 60 and a portion of the first magnetic detection portion 61. Additionally, the component support portion 78 exposes and covers the surface of the first opposing portion 711 of the first magnetic guiding member 71 that faces the first yoke annular portion 370. Furthermore, the component support portion 78 covers a portion of the first intermediate portion 715 of the first magnetic guiding member 71. Thus, the component support portion 78 supports the first magnetic guiding member 71. Furthermore, the component support portion 78 exposes and covers the surface of the third opposing portion 723 of the second magnetic guiding member 72 that faces the second yoke annular portion 380. Furthermore, the component support portion 78 covers a portion of the second intermediate portion 725 of the second magnetic guiding member 72. Thus, the component support 78 supports the second magnetic guide component 72.

[0078] The elastic member 80 is formed of rubber or the like, such as an O-ring or X-ring. The elastic member 80 is inserted into the space formed by the recess 771. Furthermore, the elastic member 80 is elastically deformed by being clamped by the recess 771 and the inner surface 422 of the second cylindrical portion 402. Thus, the elastic member 80 blocks the gap between the inner surface 422 of the second cylindrical portion 402 and the opposing surface 775 of the insertion portion 77 opposite to the inner surface 422. Therefore, foreign objects such as dust or water are prevented from entering the first space 411 and the second space 412 of the housing 40, thus protecting the first magnetic detection unit 61 and the second magnetic detection unit 62 from foreign object interference. This improves the dustproof and waterproof performance of the torque sensor 25.

[0079] A portion of terminal 85 is inserted into a hole in substrate 60. Additionally, terminal 85 is connected to substrate 60 by soldering. Furthermore, terminal 85 is connected to motor control device 18. Therefore, signals from the first magnetic detection unit 61 and the second magnetic detection unit 62 are output to motor control device 18 via terminal 85.

[0080] The terminal housing 90 is formed into a cylindrical shape from resin or the like. Furthermore, the terminal housing 90 houses a portion of the terminal 85. The terminal housing 90 supports a portion of the terminal 85 by inserting a portion of the terminal 85 into a hole in the terminal housing 90. Additionally, a portion of the terminal housing 90 is inserted into the space between the flange portion 76 and the insertion portion 77. Moreover, the terminal housing 90 and the substrate 60 are fixed by inserting a portion of the terminal housing 90 into a hole in the substrate 60.

[0081] Here, as Figure 6 and Figure 9 As shown, the minimum distance from the first opposing portion 711 of the first magnetic guiding member 71 to the first yoke annular portion 370 is defined as the yoke distance Lcy. The minimum distance from the first opposing portion 711 to the inner surface 422 of the second cylindrical portion 402 of the outer casing 40 is defined as the outer casing distance Lch. Moreover, as shown in the following relationship (1), the outer casing distance Lch is greater than the yoke distance Lcy. In addition, the minimum distance from the third opposing portion 723 to the inner surface 422 is greater than the minimum distance from the third opposing portion 723 of the second magnetic guiding member 72 to the second yoke annular portion 380. Furthermore, the yoke distance Lcy can also be the minimum distance of the axial direction Da among the aforementioned minimum distances. In addition, the outer casing distance Lch can also be the minimum distance of the axial direction Da among the aforementioned minimum distances.

[0082] Lch>Lcy……(1)

[0083] Furthermore, the minimum distance from the inner surface 422 of the second cylindrical portion 402 to the opposing surface 775 of the insertion portion 77 is defined as the gap distance Lbh. Moreover, as shown in the following relationship (2), the yoke distance Lcy is greater than the gap distance Lbh. In addition, the minimum distance from the third opposing portion 723 of the second magnetic guiding member 72 to the second yoke annular portion 380 is greater than the gap distance Lbh. Furthermore, the gap distance Lbh can also be the minimum distance of the axial direction Da among the aforementioned minimum distances.

[0084] Lbh<Lcy……(2)

[0085] In addition, such as Figure 7As shown, the length of the overlapping portion of the first yoke ring portion 370 when projected along the axial direction Da onto the component support portion 78, extending in the direction of extension of the second cylindrical portion 402, is defined as the overlap length Ls. Furthermore, the length from the end face 406 of the second cylindrical portion 402 to the front end face 405 of the outer casing protrusion 403, extending in the direction of extension of the second cylindrical portion 402, is defined as the protrusion length Lh. Moreover, as shown in the following relationship (3), the protrusion length Lh is greater than the overlap length Ls. Additionally, the protrusion length Lh is greater than the length of the overlapping portion of the second yoke ring portion 380 when projected along the axial direction Da onto the component support portion 78, extending in the direction of extension of the second cylindrical portion 402.

[0086] Lh>Ls……(3)

[0087] The torque sensor 25 is configured as described above. Next, the detection of steering torque using the torque sensor 25 will be explained.

[0088] Assume that steering wheel 5 is not rotated, thus generating no steering torque. In this case, as... Figure 10 As shown, the magnet 30, the first yoke claw 372, and the second yoke claw 382 are phase-matched in a neutral state in the circumferential direction. In this neutral state, the center positions of all the first yoke claws 372 and the second yoke claws 382 in the circumferential direction coincide with the boundaries of the N and S poles of the magnet 30. At this time, the number of magnetic field lines passing through the first yoke claw 372 from the N pole of the magnet 30 is the same as the number of magnetic field lines passing through the second yoke claw 382 from the N pole of the magnet 30. Therefore, no magnetic flux density is generated between the first yoke 361 and the second yoke 362.

[0089] Furthermore, when the steering wheel 5 is rotated, a steering torque is generated, thereby causing the first steering shaft 11 connected to the steering wheel 5 to rotate. Additionally, the torsion bar 13, fixed to the first steering shaft 11 via the pin 14, rotates. Furthermore, the second steering shaft 12, fixed to the torsion bar 13 via the pin 14, rotates. The second steering shaft 12 is connected to the fixing sleeve 354. Therefore, the rotating body 35 rotates. Consequently, the first yoke 361 and the second yoke 362, which are integral with the rotating body 35, rotate relative to the magnet 30.

[0090] In this case, such as Figure 11 As shown, the overlap between the N pole of magnet 30 and the first yoke claw 372 in the direction orthogonal to the axial direction Da increases. Additionally, the overlap between the S pole of magnet 30 and the second yoke claw 382 in the direction orthogonal to the axial direction Da also increases. At this time, the magnetic field lines from the N pole of magnet 30 toward the first yoke claw 372 increase, and the magnetic field lines from the second yoke claw 382 toward the S pole of magnet 30 increase. Therefore, a magnetic flux density is generated between the first yoke 361 and the second yoke 362.

[0091] Here, as described above, the first magnetic guiding member 71 is formed of a soft magnetic material and is positioned opposite the first yoke annular portion 370 and the first magnetic detection portion 61 in the axial direction Da. Furthermore, as described above, the second magnetic guiding member 72 is formed of a soft magnetic material and is positioned opposite the first magnetic detection portion 61 and the second yoke annular portion 380 in the axial direction Da.

[0092] Therefore, at this time, the magnetic field lines from the N pole of the magnet 30 through the first yoke ring portion 370 and the first magnetic guiding member 71 through the first magnetic detection unit 61 increase. Moreover, the magnetic field lines passing through the first magnetic detection unit 61 pass through the S pole of the magnet 30 through the second magnetic guiding member 72 and the second yoke ring portion 380.

[0093] Therefore, the first magnetic detection unit 61 detects the strength of the magnetic field in one direction of the axial direction Da. As a result, the first magnetic detection unit 61 detects the steering torque. Furthermore, the first magnetic detection unit 61 outputs a signal corresponding to the detected magnetic field strength to the motor control device 18 via terminal 85. The motor control device 18 calculates the steering torque based on the signal from the first magnetic detection unit 61.

[0094] In addition, after producing with Figure 11 In the case of steering torque in the opposite direction, such as Figure 12 As shown, the overlap between the S pole of magnet 30 and the first yoke claw 372 in a direction orthogonal to the axial direction Da increases. Additionally, the overlap between the N pole of magnet 30 and the second yoke claw 382 in a direction orthogonal to the axial direction Da also increases. At this time, the magnetic field lines from the N pole of magnet 30 toward the second yoke claw 382 increase, and the magnetic field lines from the first yoke claw 372 toward the S pole of magnet 30 also increase. Therefore, a magnetic flux density is generated between the first yoke 361 and the second yoke 362.

[0095] Therefore, at this time, the magnetic field lines from the N pole of the magnet 30 through the second yoke ring portion 380 and the second magnetic guiding member 72 through the first magnetic detection portion 61 increase. Moreover, the magnetic field lines passing through the first magnetic detection portion 61 pass through the first magnetic guiding member 71 and the first yoke ring portion 370 through the S pole of the magnet 30.

[0096] Therefore, the first magnetic detection unit 61 detects the strength of the magnetic field in another direction along the axial direction Da. As a result, the first magnetic detection unit 61 detects the steering torque. Furthermore, the first magnetic detection unit 61 outputs a signal corresponding to the strength of the detected magnetic field to the motor control device 18 via terminal 85. The motor control device 18 calculates the steering torque based on the signal from the first magnetic detection unit 61.

[0097] As described above, the torque sensor 25 detects the steering torque. Furthermore, the second magnetic detection unit 62 of the torque sensor 25 detects the steering torque in the same way as the first magnetic detection unit 61. Therefore, in the event of a failure in the first magnetic detection unit 61, the torque sensor 25 can use the second magnetic detection unit 62 to detect the steering torque. Next, the improved ESD resistance in the torque sensor 25 will be explained. Furthermore, ESD is an abbreviation for Electro Static Discharge.

[0098] The torque sensor 25 includes a magnet 30, a rotating body 35, a first yoke 361, a second yoke 362, a first magnetic detection unit 61, a second magnetic detection unit 62, a first magnetic guiding member 71, a second magnetic guiding member 72, a sensor housing 75, and a housing 40. The magnet 30 generates a magnetic field and rotates with the steering wheel 5. The first yoke 361 has a first yoke annular portion 370 and a first yoke claw portion 372. The first yoke annular portion 370 is formed in an annular shape and rotates with the rotating body 35. The first yoke claw portion 372 protrudes radially from the first yoke annular portion 370 toward the axial direction Da and is radially opposed to the magnet 30, and changes the magnetic field generated by the magnet 30 by rotating with the first yoke annular portion 370. The second yoke 362 has a second yoke annular portion 380 and a second yoke claw portion 382. The second yoke annular portion 380 is formed in an annular shape and rotates with the rotating body 35. The second yoke claw portion 382 protrudes radially from the second yoke ring portion 380 toward the axial direction Da and is opposed to the magnet 30. It rotates together with the second yoke ring portion 380, causing the magnetic field generated by the magnet 30 to change. The first magnetic detection portion 61 and the second magnetic detection portion 62 detect the intensity of the magnetic field that changes due to the rotation of the first yoke claw portion 372 and the second yoke claw portion 382. The intensity of this magnetic field corresponds to the steering torque. The first magnetic guide member 71 guides the magnetic field that changes due to the rotation of the first yoke claw portion 372 to the first magnetic detection portion 61 and the second magnetic detection portion 62. The second magnetic guide member 72 guides the magnetic field that changes due to the rotation of the second yoke claw portion 382 to the first magnetic detection portion 61 and the second magnetic detection portion 62. The sensor housing 75 has a component support portion 78. The component support portion 78 is formed as a bottomed cylindrical shape, housing the first magnetic detection portion 61 and the second magnetic detection portion 62, and supporting the first magnetic guide member 71 and the second magnetic guide member 72 by covering them. The outer casing 40 has a first cylindrical portion 401 and a second cylindrical portion 402. The first cylindrical portion 401 is formed into a cylindrical shape extending along the axial direction Da, and houses the magnet 30, the rotating body 35, the first yoke 361, and the second yoke 362. The second cylindrical portion 402 is formed into a cylindrical shape extending radially, and houses the component support portion 78. Furthermore, the first magnetic guiding component 71 has a first opposing portion 711. The first opposing portion 711 overlaps with the projected first yoke annular portion 370 when the first yoke annular portion 370 is projected along the axial direction Da. Additionally, the first opposing portion 711 overlaps with the projected inner surface 422 of the second cylindrical portion 402 when the inner surface 422 is projected along the axial direction Da. The second magnetic guiding component 72 has a third opposing portion 723. The third opposing portion 723 overlaps with the projected second yoke annular portion 380 when the second yoke annular portion 380 is projected along the axial direction Da. Furthermore, the third opposing portion 723 overlaps with the projected inner surface 422 of the second cylindrical portion 402 when the inner surface 422 is projected along the axial direction Da. Additionally, as... Figure 6 and Figure 9As shown, the outer casing distance Lch is greater than the yoke distance Lcy. Furthermore, the minimum distance from the third opposing portion 723 to the inner surface 422 is greater than the minimum distance from the third opposing portion 723 of the second magnetic guide member 72 to the second yoke annular portion 380. Additionally, the steering wheel 5 corresponds to the detection object. The steering torque corresponds to the torque of the detection object. The first yoke 361 and the second yoke 362 correspond to the yoke. The first yoke annular portion 370 and the second yoke annular portion 380 correspond to the annular portion. The first yoke claw portion 372 and the second yoke claw portion 382 correspond to the claw portion. The first magnetic detection portion 61 and the second magnetic detection portion 62 correspond to the magnetic detection portion. The first magnetic guide member 71 and the second magnetic guide member 72 correspond to the guide member. The first opposing portion 711 and the third opposing portion 723 correspond to the opposing portion. The sensor housing 75 corresponds to the housing. The radial direction corresponds to the direction orthogonal to the axial direction Da.

[0099] Therefore, the first magnetic detection unit 61, the second magnetic detection unit 62, and the first magnetic guiding member 71 are located further away from the inner surface 422 of the second cylindrical portion 402 of the outer casing 40 than the first yoke annular portion 370. Thus, even if static electricity is generated during the manufacturing or use of the torque sensor 25, the discharge current generated by this static electricity is unlikely to flow to the outer casing 40 via the first magnetic detection unit 61, the second magnetic detection unit 62, and the first magnetic guiding member 71. Therefore, ESD resistance is improved in the torque sensor 25. Furthermore, the first magnetic detection unit 61, the second magnetic detection unit 62, and the second magnetic guiding member 72 are located further away from the inner surface 422 of the second cylindrical portion 402 of the outer casing 40 than the second yoke annular portion 380. Therefore, even if static electricity is generated during the manufacturing or use of the torque sensor 25, the discharge current generated by this static electricity is unlikely to flow to the outer casing 40 via the first magnetic detection unit 61, the second magnetic detection unit 62, and the second magnetic guiding member 72. Therefore, ESD resistance is improved in the torque sensor 25.

[0100] In addition, the torque sensor 25 also performs the following functions.

[0101] [1-1] The sensor housing 75 also has an insertion portion 77. The insertion portion 77 is connected to the component support portion 78 in the direction extending from the second cylindrical portion 402 and is inserted into the second cylindrical portion 402. Moreover, the yoke distance Lcy is greater than the gap distance Lbh. In addition, the minimum distance from the third opposing portion 723 of the second magnetic guiding component 72 to the second yoke annular portion 380 is greater than the gap distance Lbh.

[0102] Therefore, even if the component support portion 78 is misaligned in the axial direction Da, the inner surface 422 of the second cylindrical portion 402 and the opposing surface 775 of the insertion portion 77 will contact each other before the first opposing portion 711 and the first yoke annular portion 370 come into contact. Thus, interference between the first opposing portion 711 and the first yoke annular portion 370 is suppressed. Furthermore, even if the component support portion 78 is misaligned in the axial direction Da, the inner surface 422 of the second cylindrical portion 402 and the opposing surface 775 of the insertion portion 77 will contact each other before the third opposing portion 723 and the second yoke annular portion 380 come into contact. Therefore, interference between the third opposing portion 723 and the second yoke annular portion 380 is suppressed. In addition, this reduces the risk of malfunctions of the torque sensor 25, the first yoke 361, and the second yoke 362.

[0103] [1-2] The sensor housing 75 also has a flange portion 76. The flange portion 76 is connected to the side of the insertion portion 77 opposite to the component support portion 78 in the direction in which the second cylindrical portion 402 extends. The second cylindrical portion 402 also has an end face 406 and a housing protrusion 403. The end face 406 is located on the side opposite to the first cylindrical portion 401 and faces the direction in which the second cylindrical portion 402 extends. The housing protrusion 403 protrudes from the end face 406 in the direction in which the second cylindrical portion 402 extends. In addition, the flange portion 76 includes a flange cylindrical portion 760 and two rotation-limiting flange protrusions 762. The flange cylindrical portion 760 is opposite to the cylindrical end face 406 in the direction in which the second cylindrical portion 402 extends. The rotation-limiting flange protrusions 762 protrude from the flange cylindrical portion 760 in the axial direction Da. Furthermore, the housing protrusion 403, being located between the rotation limiting flange protrusion 762, restricts the rotation of the sensor housing 75 about the axis extending in the direction of the second cylindrical portion 402 when in contact with the rotation limiting flange protrusion 762.

[0104] As a result, the rotation of the sensor housing 75 is suppressed, so the relative distance between the first opposing portion 711 of the first magnetic guiding member 71, the first yoke annular portion 370, the third opposing portion 723 of the second magnetic guiding member 72, and the second yoke annular portion 380 remains constant. Therefore, the sensitivity of the first magnetic detection unit 61 and the second magnetic detection unit 62 can be stabilized.

[0105] [1-3] such as Figure 7 As shown, the length of the protrusion Lh is greater than the overlap length Ls. In addition, the length of the protrusion Lh is greater than the length of the overlapping portions when the second yoke ring portion 380 is projected along the axial direction Da toward the component support portion 78 in the direction in which the second cylindrical portion 402 extends.

[0106] Therefore, even if the component support 78 is misaligned in the direction in which the second cylinder 402 extends, the end faces 406 of the flange cylinder 760 and the second cylinder 402 will make contact before the component support 78 and the rotating body 35 come into contact. Thus, interference between the component support 78 and the rotating body 35 is suppressed.

[0107] [1-4] The flange portion 76 also has a positioning flange protrusion 763. The positioning flange protrusion 763 protrudes axially Da from the side of the flange cylinder portion 760 opposite to the rotation limiting flange protrusion 762. Furthermore, the positioning flange protrusion 763 corresponds to the protrusion.

[0108] Therefore, when the flange tube portion 760 is installed on the second tube portion 402 with its orientation reversed by 180 degrees, the positioning flange protrusion 763 contacts the outer casing protrusion 403. Therefore, the insertion portion 77 cannot be inserted into the third space 413 of the second tube portion 402 at this time. Thus, the orientation error of the flange tube portion 760 is suppressed, thereby suppressing the reversal of the positive and negative signals of the first magnetic detection unit 61 and the second magnetic detection unit 62 caused by the orientation change of the first magnetic detection unit 61 and the second magnetic detection unit 62.

[0109] (Second Implementation)

[0110] In the second embodiment, the shape of the second space 412 of the second cylindrical portion 402 of the outer casing 40 differs from that in the first embodiment. Otherwise, it is the same as in the first embodiment. Figure 13 As shown, the second space 412 is cross-shaped in the cross-section when the second cylindrical portion 402 is cut along the axial direction Da. Furthermore, the distance between the inner surfaces 422 of the second cylindrical portion 402 along the axial direction Da is greater than the distance between the inner surfaces 422 of the second cylindrical portion 402 in the direction orthogonal to the axial direction Da. Moreover, the minimum distance along the axial direction Da from the end of the component support portion 78 to the inner surface 422 of the second cylindrical portion 402 is less than the yoke distance Lcy. This constitutes the second embodiment. In this second embodiment, the same effects as the first embodiment are achieved.

[0111] (Third Implementation)

[0112] In the third embodiment, the shape of the second space 412 differs from that in the first embodiment. Otherwise, it is the same as in the first embodiment. Figure 14 As shown, the second space 412 is elliptical in cross-section when the second cylindrical portion 402 is cut along the axial direction Da. Furthermore, the distance between the inner surfaces 422 of the second cylindrical portion 402 along the axial direction Da is less than the distance between the inner surfaces 422 of the second cylindrical portion 402 in the direction orthogonal to the axial direction Da. Moreover, the minimum distance along the axial direction Da from the end of the component support portion 78 to the inner surface 422 of the second cylindrical portion 402 is less than the yoke distance Lcy. This constitutes the third embodiment. In this third embodiment, the same effects as the first embodiment are achieved.

[0113] (Fourth Implementation)

[0114] In the fourth embodiment, the shape of the second space 412 differs from that in the first embodiment. Otherwise, it is the same as in the first embodiment. Figure 15 As shown, the second space 412 is cross-shaped in the cross section when the second cylindrical portion 402 is cut along the axial direction Da. Furthermore, the distance between the inner surfaces 422 of the second cylindrical portion 402 along the axial direction Da is less than the distance between the inner surfaces 422 of the second cylindrical portion 402 in the direction orthogonal to the axial direction Da. Moreover, the minimum distance along the axial direction Da from the end of the component support portion 78 to the inner surface 422 of the second cylindrical portion 402 is less than the yoke distance Lcy. This constitutes the fourth embodiment. In this fourth embodiment, the same effects as the first embodiment are achieved.

[0115] (Fifth Implementation)

[0116] In the fifth embodiment, the shape of the second cylindrical portion 402 and the shape of the insertion portion 77 of the sensor housing 75 differ from those in the first embodiment. Otherwise, they are the same as in the first embodiment.

[0117] like Figure 16 As shown, the second space 412 of the second cylindrical portion 402 is rectangular in shape in the cross-section when the second cylindrical portion 402 is cut along the axial direction Da. Furthermore, the distance between the inner surfaces 422 of the second cylindrical portion 402 along the axial direction Da is less than the distance between the inner surfaces 422 of the second cylindrical portion 402 in the direction orthogonal to the axial direction Da. Additionally, the third space 413 of the second cylindrical portion 402 is rectangular in shape in the cross-section when the second cylindrical portion 402 is cut along the axial direction Da. However, the third space 413 is not limited to a rectangular shape in the cross-section when the second cylindrical portion 402 is cut along the axial direction Da. The third space 413 may also be polygonal in shape in the cross-section when the second cylindrical portion 402 is cut along the axial direction Da.

[0118] In addition, the distance between the inner surfaces 422 of the second cylindrical portion 402 along the axial direction Da is less than the distance between the inner surfaces 422 of the second cylindrical portion 402 in the direction orthogonal to the axial direction Da.

[0119] like Figure 17 As shown, the insertion portion 77 is formed in a quadrilateral cylindrical shape to accommodate a portion of the substrate 60 and a portion of the first magnetic detection portion 61. Furthermore, the insertion portion 77 is inserted into the third space 413. However, the insertion portion 77 is not limited to being formed in a quadrilateral cylindrical shape; it may also be formed in a polygonal cylindrical shape.

[0120] This constitutes the fifth embodiment. In this fifth embodiment, the same effect as the first embodiment is achieved.

[0121] (Sixth Implementation Method)

[0122] In the sixth embodiment, the shape of the second space 412 differs from that in the fifth embodiment. Otherwise, it is the same as in the fifth embodiment. Figure 18 As shown, the second space 412 is cross-shaped in the cross section when the second cylindrical portion 402 is cut along the axial direction Da. Furthermore, the distance between the inner surfaces 422 of the second cylindrical portion 402 along the axial direction Da is greater than the distance between the inner surfaces 422 of the second cylindrical portion 402 in the direction orthogonal to the axial direction Da. Moreover, the minimum distance along the axial direction Da from the end of the component support portion 78 to the inner surface 422 of the second cylindrical portion 402 is less than the yoke distance Lcy. This constitutes the sixth embodiment. In this sixth embodiment, the same effects as in the fifth embodiment are achieved.

[0123] (Seventh Implementation)

[0124] In the seventh embodiment, the shape of the second space 412 differs from that in the fifth embodiment. Otherwise, it is the same as in the fifth embodiment. Figure 19 As shown, the second space 412 is elliptical in cross-section when the second cylindrical portion 402 is cut along the axial direction Da. Furthermore, the distance between the inner surfaces 422 of the second cylindrical portion 402 along the axial direction Da is less than the distance between the inner surfaces 422 of the second cylindrical portion 402 in the direction orthogonal to the axial direction Da. Moreover, the minimum distance along the axial direction Da from the end of the component support portion 78 to the inner surface 422 of the second cylindrical portion 402 is less than the yoke distance Lcy. This constitutes the seventh embodiment. In this seventh embodiment, the same effects as in the fifth embodiment are achieved.

[0125] (Eighth Implementation Method)

[0126] In the eighth embodiment, the shape of the second space 412 differs from that in the fifth embodiment. Otherwise, it is the same as in the fifth embodiment. Figure 20 As shown, the second space 412 is cross-shaped in the cross section when the second cylindrical portion 402 is cut along the axial direction Da. Furthermore, the distance between the inner surfaces 422 of the second cylindrical portion 402 along the axial direction Da is less than the distance between the inner surfaces 422 of the second cylindrical portion 402 in the direction orthogonal to the axial direction Da. Moreover, the minimum distance along the axial direction Da from the end of the component support portion 78 to the inner surface 422 of the second cylindrical portion 402 is less than the yoke distance Lcy. This constitutes the eighth embodiment. In this eighth embodiment, the same effects as in the fifth embodiment are achieved.

[0127] (Ninth Implementation)

[0128] In the ninth embodiment, the second cylindrical portion 402 does not include the outer casing protrusion 403, but instead includes two rotation-limiting outer casing protrusions 423. Furthermore, the flange portion 76 of the sensor housing 75 does not include the rotation-limiting flange protrusion 762, but instead includes one flange protrusion 772. Otherwise, it is the same as the first embodiment.

[0129] like Figure 21 As shown, the rotation-limiting housing protrusion 423 protrudes radially outward from the end face 406 of the second cylindrical portion 402 on the side opposite to the first cylindrical portion 401. The flange protrusion 772 protrudes axially Da from the flange cylindrical portion 760. Furthermore, the length from the end face 406 of the second cylindrical portion 402 to the front end face 425 of the rotation-limiting housing protrusion 423 in the direction extending from the second cylindrical portion 402 is greater than the overlap length Ls.

[0130] This constitutes the ninth embodiment. In this ninth embodiment, the same effects as in the first embodiment are achieved. Furthermore, the ninth embodiment also achieves the effects described below.

[0131] [2-1] The flange protrusion 772 is located between the rotation limiting housing protrusion 423. In addition, when the rotation limiting housing protrusion 423 contacts the flange protrusion 772, it restricts the rotation of the sensor housing 75 about the axis extending in the direction of the second cylindrical portion 402.

[0132] As a result, the rotation of the sensor housing 75 is suppressed, so the relative distance between the first opposing portion 711 of the first magnetic guiding member 71, the first yoke annular portion 370, the third opposing portion 723 of the second magnetic guiding member 72, and the second yoke annular portion 380 remains constant. Therefore, the sensitivity of the first magnetic detection unit 61 and the second magnetic detection unit 62 can be stabilized.

[0133] [2-2] The length from the end face 406 of the second cylindrical portion 402 to the front face 425 of the rotation-limiting housing protrusion 423 in the direction extending ...

[0134] Therefore, even if the component support 78 is misaligned in the direction in which the second cylinder 402 extends, the end faces 406 of the flange cylinder 760 and the second cylinder 402 will make contact before the component support 78 and the rotating body 35 come into contact. Thus, interference between the component support 78 and the rotating body 35 is suppressed.

[0135] (Tenth Implementation)

[0136] In the tenth embodiment, the flange portion 76 also has two rotation-limiting protrusions 765. Additionally, the second cylindrical portion 402 includes two rotation-limiting holes 415.

[0137] like Figure 22 As shown, the rotation-limiting protrusion 765 protrudes from the flange cylinder portion 760 toward the outer casing 40. Furthermore, the rotation-limiting protrusion 765 is formed in a cylindrical shape. However, the rotation-limiting protrusion 765 is not limited to being cylindrical; it may also be formed in a polygonal prism shape or an elliptical cylinder shape, etc.

[0138] like Figure 23 As shown, the rotation limiting hole 415 is formed in the end face 406 of the second cylindrical portion 402 at a position corresponding to the rotation limiting protrusion 765, and is formed in a shape corresponding to the rotation limiting protrusion 765.

[0139] This constitutes the tenth embodiment. In this tenth embodiment, the same effects as in the first embodiment are achieved. Furthermore, the tenth embodiment also achieves the effects described below.

[0140] [3] The rotation limiting protrusion 765 is inserted into the rotation limiting hole 415 to limit the rotation of the sensor housing 75 about the axis extending in the direction of the second cylindrical portion 402.

[0141] Therefore, the rotation of the sensor housing 75 is suppressed, thus suppressing the reversal of the positive and negative signals of the first magnetic detection unit 61 and the second magnetic detection unit 62 caused by the change in the direction of the first magnetic detection unit 61 and the second magnetic detection unit 62.

[0142] (Eleventh Implementation Method)

[0143] In the eleventh embodiment, the flange portion 76 also has two rotation-limiting holes 785. Additionally, the second cylindrical portion 402 includes two rotation-limiting protrusions 435.

[0144] like Figure 24 As shown, the rotation limiting hole 785 is formed in the flange cylinder portion 760 at a position corresponding to the rotation limiting protrusion 435 described later, and is formed in a shape corresponding to the rotation limiting protrusion 435.

[0145] like Figure 25 As shown, the rotation limiting protrusion 435 protrudes from the end face 406 of the second cylindrical portion 402 toward the sensor housing 75. Furthermore, the rotation limiting protrusion 435 is formed in a cylindrical shape. However, the rotation limiting protrusion 435 is not limited to being cylindrical; it may also be formed in a polygonal prism shape or an elliptical prism shape, etc.

[0146] This constitutes the eleventh embodiment. In this eleventh embodiment, the same effects as in the first embodiment are achieved. Furthermore, the eleventh embodiment also achieves the effects described below.

[0147] [4] The rotation limiting protrusion 435 is inserted into the rotation limiting hole 785 to limit the rotation of the sensor housing 75 about the axis extending in the direction of the second cylindrical portion 402.

[0148] Therefore, the rotation of the sensor housing 75 is suppressed, thus suppressing the reversal of the positive and negative signals of the first magnetic detection unit 61 and the second magnetic detection unit 62 caused by the change in the direction of the first magnetic detection unit 61 and the second magnetic detection unit 62.

[0149] (Other implementation methods)

[0150] This disclosure is not limited to the above-described embodiments, and appropriate modifications can be made to the above-described embodiments. In addition, in each of the above-described embodiments, the elements constituting the embodiments are not necessarily essential, except where they are specifically expressed as necessary or are obviously considered necessary in principle.

[0151] In the above embodiment, the rotating body 35 is formed in a cylindrical shape. In contrast, the rotating body 35 is not limited to being formed in a cylindrical shape. For example, the rotating body 35 may also be formed in a polygonal cylindrical shape or an elliptical cylindrical shape, etc.

[0152] In the above embodiment, the first yoke annular portion 370 and the second yoke annular portion 380 are formed in a circular shape. In contrast, the first yoke annular portion 370 and the second yoke annular portion 380 are not limited to being formed in a circular shape. For example, the first yoke annular portion 370 and the second yoke annular portion 380 may also be formed in a polygonal annular shape, etc.

[0153] In the above embodiment, the first yoke claw portion 372 and the second yoke claw portion 382 are pointed. In contrast, the first yoke claw portion 372 and the second yoke claw portion 382 are not limited to being pointed. For example, the first yoke claw portion 372 and the second yoke claw portion 382 may also be rectangular or the like.

[0154] In the above embodiment, the fixing sleeve 354 is connected to the second steering shaft 12, and the magnet 30 is connected to the first steering shaft 11. However, this is not limited to the fixing sleeve 354 being connected to the second steering shaft 12 and the magnet 30 being connected to the first steering shaft 11. For example, the fixing sleeve 354 may be connected to the first steering shaft 11 and the magnet 30 to the second steering shaft 12.

[0155] In the above embodiment, the flange cylindrical portion 760 is formed in a rhomboid shape and cylindrical. In contrast, the flange cylindrical portion 760 is not limited to being formed in a rhomboid shape and cylindrical. For example, the flange cylindrical portion 760 may also be formed in a cylindrical or polygonal cylindrical shape.

[0156] In the above embodiment, the component support portion 78 is formed as a quadrilateral. In contrast, the component support portion 78 is not limited to being formed as a quadrilateral. For example, the component support portion 78 may also be formed as a polygon, a circle, or an ellipse.

[0157] In the above embodiment, the elastic member 80 is inserted into the space formed by the recess 771 of the insertion portion 77 of the sensor housing 75. In contrast, the elastic member 80 is not limited to being inserted into the space formed by the recess 771. For example, as... Figure 26 As shown, the inner surface 422 of the second cylindrical portion 402 is formed in a stepped shape, and the opposing surface 775 of the insertion portion 77 is also formed in a stepped shape. The elastic member 80 can also be elastically deformed by being sandwiched between the inner surface 422 and the opposing surface 775. Thus, as described above, the elastic member 80 blocks the gap between the inner surface 422 of the second cylindrical portion 402 and the opposing surface 775 of the insertion portion 77 opposite to the inner surface 422. Therefore, foreign objects such as dust or water are prevented from entering the first space 411 and the second space 412 of the housing 40, thus protecting the first magnetic detection unit 61 and the second magnetic detection unit 62 from the influence of foreign objects. Therefore, the dustproof and waterproof performance of the torque sensor 25 is improved.

[0158] In the tenth embodiment described above, the flange portion 76 further includes two rotation-limiting protrusions 765. Additionally, the second cylindrical portion 402 includes two rotation-limiting holes 415. However, the number of rotation-limiting protrusions 765 and rotation-limiting holes 415 is not limited to two; one or more is acceptable.

[0159] In the eleventh embodiment described above, the flange portion 76 also has two rotation-limiting holes 785. Additionally, the second cylindrical portion 402 includes two rotation-limiting protrusions 435. However, the number of rotation-limiting holes 785 and rotation-limiting protrusions 435 is not limited to two; one or more is acceptable.

[0160] The above-described implementation methods can also be combined appropriately.

Claims

1. A torque detection device for detecting torque generated by a detection object, characterized in that, have: A magnet that generates a magnetic field and rotates together with the object being detected; A rotating body that rotates together with the object being detected; The yoke has an annular portion and a claw portion. The annular portion is annular and rotates together with the rotating body. The claw portion protrudes from the annular portion toward the axial direction of the rotating body and is opposite to the magnet in a direction orthogonal to the axial direction. It also rotates together with the annular portion to change the magnetic field generated by the magnet. A magnetic detection unit that detects the strength of a magnetic field that corresponds to the torque and changes by rotating the claw. A guiding component that guides a magnetic field that changes by rotating the claw to the magnetic detection unit; A housing that houses the magnetic detection unit, having a bottomed cylindrical component support that supports the guide member by covering it; and The outer casing has a first cylindrical portion formed as a cylinder extending along the axial direction and housing the magnet, the rotating body, and the yoke, and a second cylindrical portion formed as a cylinder extending in a direction orthogonal to the axial direction and housing the component support portion; The guide member has opposing portions that overlap with the projected annular portion when the annular portion is projected along the axial direction, and overlap with the projected inner surface of the second cylindrical portion when the inner surface of the second cylindrical portion is projected along the axial direction. The minimum distance from the opposing portion to the inner surface is greater than the minimum distance from the opposing portion to the annular portion.

2. The torque detection device according to claim 1, characterized in that, The housing also has an insertion portion that is connected to the component support portion in the direction extending from the second cylindrical portion and is inserted into the second cylindrical portion. The axial distance from the opposing portion to the annular portion is greater than the axial distance from the inner surface to the opposing surface of the insertion portion that is opposite to the inner surface along the axial direction.

3. The torque detection device according to claim 1, characterized in that, The housing also has an insertion portion that is connected to the component support portion in the direction of extension of the second cylindrical portion and inserted into the second cylindrical portion, and a flange portion that is connected to the side of the insertion portion opposite to the component support portion in the direction of extension of the second cylindrical portion. The second cylindrical portion also has an end face located on the side opposite to the first cylindrical portion and extending toward the second cylindrical portion, and a housing protrusion protruding from the end face in a direction extending toward the second cylindrical portion. The flange portion includes a cylindrical flange portion opposite to the end face in the direction of extension of the second cylindrical portion and two flange protrusions protruding from the flange portion in the axial direction. The outer casing protrusions, by being located between the flange protrusions, restrict the rotation of the housing about an axis extending in the direction of the second cylindrical portion when in contact with the flange protrusions.

4. The torque detection device according to claim 3, characterized in that, The length of the second cylindrical portion extending from the end face to the front end face of the outer casing protrusion is greater than the length of the overlapping portions of the second cylindrical portion extending when the annular portion is projected along the axial direction toward the component support.

5. The torque detection device according to claim 3 or 4, characterized in that, The flange portion also has a protrusion that protrudes axially from the side of the flange cylinder portion opposite to the flange protrusion.

6. The torque detection device according to claim 1, characterized in that, The housing also has an insertion portion that is connected to the component support portion in the direction of extension of the second cylindrical portion and inserted into the second cylindrical portion, and a flange portion that is connected to the side of the insertion portion opposite to the component support portion in the direction of extension of the second cylindrical portion. The second cylindrical portion also has an end face located on the side opposite to the first cylindrical portion and extending toward the second cylindrical portion, and two outer shell protrusions protruding from the end face in a direction extending toward the second cylindrical portion. The flange portion includes a cylindrical flange portion opposite to the end face in the direction of extension of the second cylindrical portion and a flange protrusion projecting from the flange portion in the axial direction. The flange protrusions are located between the outer shell protrusions. When the outer casing protrusion contacts the flange protrusion, it restricts the rotation of the housing about an axis extending in the direction of the second cylindrical portion.

7. The torque detection device according to claim 6, characterized in that, The length of the portion extending from the end face to the front end face of the outer casing protrusion in the direction of extension of the second cylindrical portion is greater than the length of the overlapping portions of the annular portion when projected along the axial direction toward the opposing portion in the direction of extension of the second cylindrical portion.

8. The torque detection device according to claim 1, characterized in that, The housing also has an insertion portion that is connected to the component support portion in the direction of extension of the second cylindrical portion and inserted into the second cylindrical portion, and a flange portion that is connected to the side of the insertion portion opposite to the component support portion in the direction of extension of the second cylindrical portion. The second cylindrical portion includes an end face located on the side opposite to the first cylindrical portion and extending toward the second cylindrical portion, and a hole formed in the end face. The flange portion includes a cylindrical flange portion opposite to the end face in the direction extending from the second cylindrical portion and a protrusion protruding from the flange portion toward the outer casing. The protrusion, by being inserted into the hole, restricts the rotation of the housing about an axis extending in the direction of the second cylindrical portion.

9. The torque detection device according to claim 1, characterized in that, The housing also has an insertion portion that is connected to the component support portion in the direction of extension of the second cylindrical portion and inserted into the second cylindrical portion, and a flange portion that is connected to the side of the insertion portion opposite to the component support portion in the direction of extension of the second cylindrical portion. The second cylindrical portion includes an end face located on the side opposite to the first cylindrical portion and extending toward the second cylindrical portion, and a protrusion protruding from the end face toward the housing. The flange portion includes a cylindrical flange portion opposite to the end face in the direction extending from the second cylindrical portion and a hole formed in the flange portion. The protrusion, by being inserted into the hole, restricts the rotation of the housing about an axis extending in the direction of the second cylindrical portion.

10. The torque detection device according to claim 8 or 9, characterized in that, The second cylindrical portion also has a shell protrusion that protrudes from the end face in a direction extending from the second cylindrical portion. The length of the second cylindrical portion extending from the end face to the front end face of the outer casing protrusion is greater than the length of the overlapping portions of the second cylindrical portion extending in the direction of the second cylindrical portion when the annular portion is projected onto the opposing portion along the axial direction.

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