JP6617612B2 - Torque angle detector - Google Patents

Description

  The present invention relates to a torque angle detection device that detects a torque applied to a torsion bar and a rotation angle of one end of the torsion bar.

  For example, in Patent Document 1, a change in relative position between a magnetic body connected to a steering and a magnet connected to a rotating body connected to the steering via a torsion bar is detected as a change in magnetic flux of the magnetic body. However, this is described as a torque detection value. In this apparatus, a rotating gear is connected to the rotating body, and a detection gear is engaged with the rotating gear. The detection gear is provided with a magnet, and the magnetic detection element arranged opposite to the magnet outputs a signal corresponding to the relative rotation angle between the magnetic detection element and the magnet to the rotation angle of the rotating body. Output as detection value.

JP 2014-65367 A

  By the way, in the case of the said apparatus, since the rotation gear and the gear for a detection are provided in the outer side with respect to the member for torque detection, the apparatus which detects a torque and the apparatus which detects a rotation angle were simply arrange | positioned adjacently. Almost the same as things. For this reason, the apparatus is increased in size by integrating the apparatus for detecting the torque and the apparatus for detecting the rotation angle.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a torque angle detection device capable of suppressing the enlargement of the device as much as possible while allowing both the rotation angle and the torque to be detected. It is in.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
1. The torque angle detection device includes a first rotating shaft and a second rotating shaft connected via a torsion bar, a first stator disposed opposite to a first rotor provided on the first rotating shaft, and the second rotating shaft. A second stator disposed opposite to a second rotor provided on the rotating shaft; a rotating gear fixed to one of the first rotating shaft and the second rotating shaft; and the rotating gear engaged with the second rotor. And a detection gear provided with a magnet, and a magnetic detection element that outputs an output signal according to relative rotation with the magnet due to rotation of the detection gear accompanying rotation of the rotation gear, The first stator includes a first core, a first insulator covering the first core, and a first coil wound around the first core via the first insulator, and the second stator is A second core and the second core The second insulator and a second coil wound around the second core via the second insulator, and the second insulator according to the rotation angle difference between the first rotation shaft and the second rotation shaft The electric signal of one coil and the electric signal of the second coil are detected values of torque applied to the torsion bar, and the output signal of the magnetic detection element is the one of the first rotating shaft and the second rotating shaft. The rotation gear is disposed between the first stator and the second stator, the first insulator and the second insulator are coupled to each other, and the first stator, the second stator, and the The rotating gear is arranged so as to be coaxial.

  In the above configuration, the rotating gear is disposed between the first stator and the second stator. And the 1st stator and the 2nd stator are arrange | positioned coaxially, and mutual insulators are couple | bonded. For this reason, the housing of a rotating gear can be comprised by diverting an insulator. Therefore, the enlargement of the apparatus can be suppressed as much as possible while both the rotation angle and the torque can be detected.

  2. 2. The torque angle detection device according to 1, wherein teeth are formed along a circumferential direction in each of the first core and the second core, and the teeth are portions of the first insulator that cover the teeth. The covering portion is formed with a protrusion for restricting the first coil from being wound and displacing the first coil inward in the radial direction of the first insulator. The teeth covering portion which is a portion covering the teeth is formed with a protrusion that restricts the second coil from being wound and displacing the second coil radially inward of the second insulator, On the outer peripheral surface of the rotating gear, a rotation-side step portion that generates a step in the axial direction of the rotating gear is formed over the entire circumference in the circumferential direction of the rotating gear. The difference portion, and at least one of the protrusions of the first stator and the second stator is arranged to face in the radial direction.

  In the above configuration, the rotation-side step portion of the rotating gear and the protruding portion are arranged to face each other in the radial direction, whereby the displacement of the rotating gear in the radial direction is restricted by the protruding portion. Here, since the protrusion is used to restrict the displacement of the coil inward in the radial direction, the protrusion rotates without providing a new member to restrict the radial displacement of the rotating gear. The radial displacement of the gear can be regulated.

  3. In the torque angle detection device according to 1 or 2 above, an accommodating portion that accommodates the detection gear is coupled to a radially outer side of the first insulator and the second insulator, and the magnet is used for the detection. The magnetic detection element is provided on a rotation center axis of the gear, and the magnetic detection element includes a first magnetic detection element and a second magnetic detection element provided on both sides of the detection gear on the rotation center axis. Including.

  In the above configuration, since both the magnetic detection element and the magnet are provided on the rotation center axis, the at least one of them is provided with the rotation of the detection gear as compared with a case where at least one of them is provided at a position off the rotation center axis. Complicating changes in magnetic flux detected by the first magnetic detection element and the second magnetic detection element can be suppressed. Further, by arranging both the first magnetic detection element and the second magnetic detection element on the rotation center axis, the change in magnetic flux detected by the first magnetic detection element with the rotation of the detection gear, and the second It is easy to approximate the change in magnetic flux detected by the magnetic detection element. For this reason, in the redundant design including the first magnetic detection element and the second magnetic detection element, it is easy to determine the presence or absence of at least one abnormality from the difference between the detected values.

4). 4. The torque angle detection device according to 3 above, wherein a bearing portion of the detection gear is provided outside the magnet in a radial direction of the detection gear.
In the said structure, since a bearing part is provided in the outer side of a magnet, it is easy to make the distance of a 1st magnetic detection element and a magnet, and the distance of a 2nd magnetic detection element and a magnet the same. For this reason, the magnetic flux detected by the first magnetic detection element and the magnetic flux detected by the second magnetic detection element can be made the same as much as possible.

  5). 5. The torque angle detection device according to claim 4, wherein the housing portion includes a first housing portion disposed on the radially outer side of the first insulator, and a second housing portion disposed on the radially outer side of the second insulator. The detection gear includes a detection-side step portion that generates a step in the axial direction of the detection gear, and is formed over the entire circumference of the detection gear. The bearing portion is formed in at least one of the two housing portions, and the detection-side step portion and the bearing portion are arranged to face each other in the radial direction of the detection gear, and the first housing Part and the second housing part are coupled.

In the above configuration, the detection-side step portion of the detection gear and the bearing portion are arranged to face each other in the radial direction, whereby the detection gear is restricted from being displaced in the radial direction by the bearing portion.
6). In the torque angle detection device according to 4 above, the storage portion includes a first storage portion disposed on the radially outer side of the first insulator, and a second storage portion disposed on the radially outer side of the second insulator. The bearing portion is formed in at least one of the first housing portion and the second housing portion, and the bearing portion is an outer circumferential surface located on the radially outer side of the teeth of the detection gear. The first housing portion and the second housing portion are coupled to each other.

In the above-described configuration, the outer peripheral surface of the tooth of the detection gear and the bearing portion are arranged to face each other in the radial direction, so that the displacement of the detection gear in the radial direction is restricted by the bearing portion.
7). In the torque angle detection device according to 5 or 6, the first housing portion is coupled to the first insulator, and the second housing portion is coupled to the second insulator.

  In the above configuration, since the first housing portion is coupled to the first insulator and the second housing portion is coupled to the second insulator, the first housing is coupled by coupling the first insulator and the second insulator. It becomes possible to couple | bond a part and a 2nd accommodating part.

  8). 8. The torque angle detection device according to 7 above, wherein the first magnetic detection element is mounted on a substrate, and the main surface of the substrate faces the detection gear in the axial direction of the detection gear. The board is housed in the first housing portion, and the first housing portion is provided with connector-side leads that extend to the radially outer side and the axially outer side by bending. And the board | substrate side lead extended so that it may protrude from the said main surface of the said board | substrate is joined to the part extended to the said axial direction outer side among the said connector side leads.

  In place of the above configuration, when the board-side lead is extended radially outward without providing the connector-side lead, stress is applied to the board when the board-side lead is fitted into the female terminal. On the other hand, in the above configuration, since the board-side lead and the female terminal can be electrically connected by fitting the connector-side lead into the female terminal, the board-side lead and the female terminal are electrically connected. At this time, it is possible to suitably suppress the stress from being applied to the substrate.

  9. 3. The torque angle detection device according to 1 or 2, wherein the magnetic detection element is mounted on a board, and the main surface of the board faces the detection gear in the axial direction of the detection gear. The first insulator is coupled to a gear housing that houses the detection gear on the radially outer side of the first stator, and the second insulator is radially coupled to the second stator. A substrate housing that accommodates the substrate is coupled to the outside, and the gear housing and the substrate housing are coupled.

  In the above configuration, since the substrate housing and the gear housing are coupled to each other and the insulator is coupled to the insulator, the torque including the insulator and the substrate housing is compared with, for example, the case where the insulator and the substrate housing are not coupled. It is easy to miniaturize the angle detector.

10. 10. The torque angle detecting device according to 9, wherein the rotating gear shaft and the detecting gear shaft are arranged in parallel to each other.
In the above configuration, the gear housing is arranged to extend outward in the radial direction of the insulator, and as a result, the substrate housing is also arranged to extend outward in the radial direction of the insulator. For this reason, it can suppress that the length of the torque angle detection apparatus in the axial direction of an insulator becomes long due to the substrate housing and the gear housing.

  11. 11. The torque angle detection device according to 9 or 10, wherein the board housing is provided with a connector-side lead that is bent to extend outward in the radial direction and outward in the axial direction, and protrudes from the main surface of the board. The board-side lead that extends in this manner is joined to a portion of the connector-side lead that extends outward in the axial direction.

  In place of the above configuration, when the board-side lead is extended radially outward without providing the connector-side lead, stress is applied to the board when the board-side lead is fitted into the female terminal. On the other hand, in the above configuration, since the board-side lead and the female terminal can be electrically connected by fitting the connector-side lead into the female terminal, the board-side lead and the female terminal are electrically connected. At this time, it is possible to suitably suppress the stress from being applied to the substrate.

The disassembled perspective view which shows the structure of the stator concerning 1st Embodiment. The disassembled perspective view which shows the structure of the stator and angle detection apparatus concerning the embodiment. The top view which shows the assembly | attachment structure of the gearwheel to the stator concerning the embodiment. Sectional drawing which shows the cross-sectional structure of the torque angle detection apparatus concerning the embodiment. Sectional drawing which shows the cross-sectional structure of the torque angle detection apparatus concerning 2nd Embodiment. (A) And (b) is the top view and sectional drawing of the bearing part concerning the embodiment. Sectional drawing which shows typically the detection process of the magnetic flux of the magnet by the magnetic detection element concerning the embodiment. Sectional drawing which shows the cross-sectional structure of the torque angle detection apparatus concerning the modification of 1st Embodiment. Sectional drawing which shows the cross-sectional structure of the torque angle detection apparatus concerning the modification of 1st Embodiment. Sectional drawing which shows the cross-sectional structure of the torque angle detection apparatus concerning the modification of 1st Embodiment. Sectional drawing which shows the cross-sectional structure of the torque angle detection apparatus concerning the modification of 2nd Embodiment. Sectional drawing which shows the cross-sectional structure of the torque angle detection apparatus concerning the modification of 2nd Embodiment. Sectional drawing which shows the cross-sectional structure of the torque angle detection apparatus concerning the modification of 2nd Embodiment. (A) And (b) is a top view and sectional view of a bearing part concerning a 2nd embodiment. Sectional drawing which shows the cross-sectional structure of the torque angle detection apparatus concerning the modification of 2nd Embodiment. The perspective view which shows the bearing part concerning the embodiment. Sectional drawing which shows typically the detection process of the magnetic flux of the magnet by the magnetic detection element concerning the modification of 2nd Embodiment.

<First Embodiment>
Hereinafter, a first embodiment according to a torque angle detection device will be described with reference to the drawings.

  FIG. 1 shows the configuration of the stator of the torque angle detection device according to the present embodiment. As shown in FIG. 1, the torque angle detection device uses a first stator S <b> 1 of a first resolver for detecting a rotation angle of an input shaft, which is a rotation shaft connected to a steering, and an input shaft via a torsion bar. And a second stator S2 of a second resolver for detecting the rotation angle of the connected output shaft. The first stator S1 and the second stator S2 are coupled to each other in the axial direction Da.

  The first stator S1 includes a first core 10a made of an electromagnetic steel plate, a resin-made first outer insulator 20a, and a resin-made first inner insulator 30a. The first core 10a includes a ring-shaped back yoke 14a and teeth 12a that protrude radially inward from the back yoke 14a.

  The second stator S2 includes a second core 10b, a second outer insulator 20b, and a second inner insulator 30b corresponding to the first core 10a, the first outer insulator 20a, and the first inner insulator 30a of the first stator S1, respectively. It has. The second core 10b includes a ring-shaped back yoke 14b and teeth 12b that protrude radially inward from the back yoke 14b.

  The torque angle detection device is also engaged with a rotation gear 50 connected to the input shaft, a detection gear 60 engaged with the rotation gear 50, and a detection gear 60 as members for detecting the angle. A detection gear 70 and a substrate 80 are provided. The substrate 80 is mounted with a magnetic detection element that detects the rotation angle of the rotation gear 50 by detecting the rotation angle of the detection gears 60 and 70.

  A resin gear housing 22a is formed integrally with the first outer insulator 20a on the first outer insulator 20a so as to protrude in the radial direction Dr. Similarly, a resin-made substrate housing 22b is integrally formed with the second outer insulator 20b so as to protrude in the radial direction Dr on the second outer insulator 20b.

  The first inner insulator 30 a and the second inner insulator 30 b include a fitting portion 44, and a hollow cylindrical bush 42 is fitted into the fitting portion 44, thereby being coupled in the axial direction Da. Further, the first core 10a and the second core 10b are formed with insertion holes 46, and bolts are inserted so as to penetrate the bushes 42 and the insertion holes 46, whereby the first stator S1 and the second core 10b. A stator unit 40 including a stator S2 is fixed to a housing that houses the stator unit 40.

  As shown in FIG. 2, the first outer insulator 20a and the first inner insulator 30a are arranged between the first core 10a and the first coil 18a in a state where the first coil 18a is wound around the first core 10a. The first coil 18a is interposed so as not to directly contact the first core 10a. Thereby, the 1st outer side insulator 20a and the 1st inner side insulator 30a become a protection member which protects the 1st coil 18a. The second outer insulator 20b and the second inner insulator 30b are interposed between the second core 10b and the second coil 18b in a state where the second coil 18b is wound around the second core 10b. The coil 18b is prevented from directly contacting the second core 10b. Thereby, the 2nd outer side insulator 20b and the 2nd inner side insulator 30b are protective members which protect the 2nd coil 18b.

  Specifically, a protrusion 25a that restricts the first coil 18a from being displaced inward in the radial direction of the first inner insulator 30a is formed in the tooth covering portion 24a that covers the tooth 12a of the first inner insulator 30a. Has been. The protrusion 25a is a portion protruding in the axial direction Da. Similarly, a protrusion 25b that restricts the second coil 18b from being displaced inward in the radial direction of the second inner insulator 30b is formed on the tooth covering portion 24b that covers the tooth 12b of the second inner insulator 30b. ing. The protrusion 25b is a portion protruding in the axial direction Da.

  The detection gear 60 has teeth 62 protruding radially outward on its outer periphery, and the detection gear 70 has teeth 72 protruding radially outward on its outer periphery. Yes. The teeth 62 and the teeth 72 are engaged, so that the rotational power can be transmitted from the detection gear 60 to the detection gear 70. A permanent magnet 90 is fixed near the rotation center of the detection gear 60, and a permanent magnet 92 is fixed near the rotation center of the detection gear 70.

The permanent magnet 90 is disposed to face the magnetic detection element 82 mounted on the substrate 80, and the permanent magnet 92 is disposed to face the magnetic detection element 84 mounted on the substrate 80.
The rotating gear 50 is formed with teeth 52 projecting radially outward on the outer periphery thereof. Further, a groove 54 that is recessed in the axial direction Da is formed continuously around the entire circumference in the circumferential direction Dc near the outer periphery of the rotating gear 50. The number of teeth 62 of the detection gear 60 and the number of teeth 72 of the detection gear 70 are different from each other. As a result, when the rotation angle of the detection gear 60 and the rotation angle of the detection gear 70 are set to an angle of 0 to 360 °, the rotation gear 50 is rotated in the clockwise or counterclockwise direction until the maximum rotation. A plurality of the same sets of the rotation angle of the detection gear 60 and the rotation angle of the detection gear 70 do not appear.

  FIG. 3 shows a state in which the protrusion 25a of the first inner insulator 30a is inserted into the groove 54. In this state, the rotating gear 50 is disposed coaxially with the first core 10a of the first stator S1. The teeth 52 of the rotating gear 50 are engaged with the teeth 62 of the detection gear 60.

  FIG. 4 shows a cross-sectional view in a state in which the first stator S1 and the second stator S2 are coupled. The cross section shown in FIG. 4 is a cross section parallel to both the axial direction Da and the radial direction Dr shown in FIG.

  As shown in FIG. 4, the input shaft 112 is provided with a rotor 114, and the inner peripheral surface of the first stator S <b> 1 is disposed to face the rotor 114. A rotor 118 is provided on the output shaft 116 connected to the input shaft 112 via the torsion bar 110. The inner circumferential surface of the second stator S2 is disposed to face the rotor 118.

  Connector side lead 100 is provided in gear housing 22a. Specifically, the connector-side lead 100 has a portion in which one conductor is bent in an L shape and extends outward in the radial direction Dr and a portion extends outward in the axial direction Da. Here, in the connector-side lead 100, a portion outside the radial direction Dr and a portion outside the axial direction Da are exposed from the gear housing 22a, and the other portions are embedded in the gear housing 22a. The portion exposed to the outside in the radial direction Dr is a portion that is fitted into the female terminal, and the cable connected to the female terminal is connected to a control device that controls the torque of the steered motor that steers the steered wheels. In the present embodiment, the gear housing 22a is formed by insert molding. Specifically, the first outer insulator 20a and the gear housing 22a are integrally formed by insert molding.

  Connector-side leads 102 are provided on the substrate housing 22b. Specifically, the connector-side lead 102 has a portion in which one conductor is bent in an L shape and extends outward in the radial direction Dr and a portion extends outward in the axial direction Da. Here, in the connector-side lead 102, a portion outside the radial direction Dr and a portion outside the axial direction Da are exposed from the substrate housing 22b, and the other portions are embedded in the substrate housing 22b. The portion exposed to the outside in the radial direction Dr is a portion fitted into the female terminal, and the cable connected to the female terminal is connected to the control device. In the present embodiment, the substrate housing 22b is formed by insert molding. Specifically, the second outer insulator 20b and the substrate housing 22b are integrally formed by insert molding.

The female terminal into which the connector-side lead 100 is inserted and the female terminal into which the connector-side lead 102 is inserted are formed in the same connector.
A board-side lead 86 extends from the main surface 80b opposite to the main surface 80a on which the magnetic detection element 82 is mounted in the board 80 to the outside in the axial direction Da while being bent. TIG welding is performed on a portion of the lead 102 exposed to the outside in the axial direction Da. The main surface is a surface having the largest area among a pair of opposing surfaces constituting the plate.

Here, the operation of the present embodiment will be described.
When torque is applied to the input shaft 112, the torsion bar 110 is twisted, and the output shaft 116 rotates while being delayed from the rotation of the input shaft 112. At this time, the torsion amount of the torsion bar 110 has a positive correlation with the torque of the input shaft 112. In other words, the angle difference between the rotation angle of the input shaft 112 and the rotation angle of the output shaft 116 has a positive correlation with the torque of the input shaft 112. The rotation angle of the input shaft 112 is detected as a change in the electrical signal in the first coil 18 a as the rotation angle of the rotor 114, and is output to the control device via the connector-side lead 100. The rotation angle of the output shaft 116 is detected as a change in the electrical signal in the second coil 18 b as the rotation angle of the rotor 118, and is output to the control device via the connector side lead 102. However, the connector-side lead 102 here is not welded to the board-side lead 86. A pair of electrical signals of the first coil 18a and the second coil 18b are processed by the control device as a signal representing a detected value of torque applied to the torsion bar 110.

  Further, when the input shaft 112 rotates, the rotating gear 50 rotates in conjunction with the input shaft 112. At this time, the rotation gear 50 is restricted from being displaced in the radial direction Dr by the groove 54. That is, the groove 54 includes the rotation-side step portion 51 and the bottom portion 53, and the rotation-side step portion 51 faces the protrusions 25 a and 25 b in the radial direction Dr. The displacement of 25a, 25b in the radial direction Dr is restricted. When the rotation gear 50 rotates, the detection gear 60 having the teeth 62 engaged with the teeth 52 of the rotation gear 50 rotates, and the teeth 72 engage with the teeth 62 of the detection gear 60 by the rotation of the detection gear 60. The detection gear 70 rotates. Then, the rotation angle of the detection gear 60 is detected as a magnetic detection value of the magnetic detection element 82 according to the relative rotation angle between the permanent magnet 90 and the magnetic detection element 82, and the board-side lead 86 among the connector-side leads 102 is detected. It is output to the control device via the connected one. Further, the rotation angle of the detection gear 70 is detected as a magnetic detection value of the magnetic detection element 84 corresponding to the relative rotation angle between the permanent magnet 92 and the magnetic detection element 84, and the board side lead 86 of the connector side leads 102 is detected. It is output to the control device via the connected one.

According to the embodiment described above, the following effects can be obtained.
(1) The rotating gear 50 is disposed between the first stator S1 and the second stator S2, and the first stator S1 and the second stator S2 are disposed coaxially to each other the first inner insulator 30a and the second stator. The inner insulator 30b is coupled with the bush 42. For this reason, the housing of the rotating gear 50 can be configured by diverting the insulators of the first stator S1 and the second stator S2. Therefore, the enlargement of the apparatus can be suppressed as much as possible while both the rotation angle and the torque can be detected.

  (2) A groove 54 depressed in the axial direction Da was continuously formed in the rotating gear 50 over the entire circumference in the circumferential direction Dc, and the protrusions 25 a and 25 b were inserted into the groove 54. As a result, the displacement of the rotating gear 50 in the radial direction Dr is restricted by the protrusions 25a and 25b. Here, since the protrusions 25a and 25b are used to restrict the displacement of the first coil 18a and the second coil 18b inward in the radial direction Dr, the displacement of the rotary gear 50 in the radial direction Dr. Therefore, the displacement of the rotating gear 50 in the radial direction Dr can be regulated without providing a new member.

  (3) The first outer insulator 20a and the gear housing 22a that accommodates the detection gears 60 and 70 are integrally molded, and the second outer insulator 20b and the substrate housing 22b that accommodates the substrate 80 are integrally molded. The housing 22a and the substrate housing 22b are combined. Thereby, compared with the case where the 2nd outer side insulator 20b and the board | substrate housing 22b are not couple | bonded, for example, it is easy to reduce in size the torque angle detection apparatus provided with the 1st outer side insulator 20a and the board | substrate housing 22b.

  (4) The axis of the rotating gear 50 and the axes of the detection gears 60 and 70 are arranged in parallel to each other. As a result, the detection gears 60 and 70 are arranged to extend outward in the radial direction Dr with respect to the first core 10a and the second core 10b, so that the gear housing 22a is radially outward of the first outer insulator 20a. It will extend and be arranged. In addition, the main surfaces 80a and 80b of the substrate 80 on which the magnetic detection elements 82 and 84 facing the permanent magnets 90 and 92 of the detection gears 60 and 70 are also diameters relative to the first core 10a and the second core 10b. Since the substrate housing 22b is arranged to extend outward in the direction Dr, the substrate housing 22b is also arranged to extend outward in the radial direction of the second outer insulator 20b. For this reason, it can suppress that the length of the torque angle detection apparatus in the axial direction Da becomes long due to the substrate housing 22b and the gear housing 22a.

  (5) The connector side lead 102 extending outward in the radial direction Dr and the axial direction Da by bending is provided on the substrate housing 22b, and the substrate side lead 86 extending so as to protrude from the main surface 80b of the substrate 80 is TIG welding was performed on a portion of the side lead 102 extending outward in the axial direction Da. When the board-side lead 86 is extended outward in the radial direction Dr and inserted into the female terminal, stress is applied to the board 80 when the board-side lead 86 is fitted into the female terminal. On the other hand, in the present embodiment, the female terminal and the board-side lead 86 can be electrically connected by fitting the connector-side lead 102 into the female terminal. Can be suitably suppressed from applying stress to the substrate 80.

<Second Embodiment>
Hereinafter, a second embodiment of the torque angle detection device will be described with reference to the drawings with a focus on differences from the first embodiment.

  In the above embodiment, the angle detection device portion is configured to include the rotation gear 50, the detection gears 60 and 70, the permanent magnets 90 and 92, and the magnetic detection element 82. In this case, it is difficult to detect that an abnormality has occurred in the magnetic detection element 82. On the other hand, when two sets of the detection gears 60 and 70, the permanent magnets 90 and 92, and the magnetic detection elements 82 are provided, the torque angle detection device is increased in size and cost. Therefore, in the present embodiment, in order to increase the reliability of the angle detection device portion, it is possible to suppress an increase in the physique while making the angle detection device portion redundant.

  FIG. 5 shows a cross-sectional view in a state where the first stator S1 and the second stator S2 are coupled. The cross section shown in FIG. 5 corresponds to the cross section shown in FIG. In FIG. 5, members corresponding to the members described in FIG. 4 and the like are denoted by the same reference numerals for convenience.

  As shown in FIG. 5, in the present embodiment, the first magnetic detection element 82 a and the second magnetic detection element 82 b are respectively arranged on both sides of the rotation center axis La of the detection gear 60 and sandwiching the permanent magnet 90. I have.

  In addition, a first accommodating portion 26a is coupled to the first outer insulator 20a on the radially outer side of the first core 10a. Specifically, the first outer insulator 20a and the first housing portion 26a are integrally formed by insert molding.

  A substrate 81 on which the first magnetic detection element 82a is mounted is accommodated in the first accommodating portion 26a. Further, the connector side lead 100 is provided in the first housing portion 26a. A board-side lead 87 extends to the outside in the axial direction Da from a main surface 81b of the board 81 opposite to the main surface 81a on which the first magnetic detection element 82a is mounted. Here, a plurality of connector-side leads TIG welding is performed on portions of the 100 exposed to the outside in the axial direction Da.

  On the other hand, the 2nd accommodating part 26b is couple | bonded with the 2nd outer side insulator 20b in the radial direction outer side of the 2nd core 10b. Specifically, the second outer insulator 20b and the second housing portion 26b are integrally formed by insert molding.

  A substrate 80 on which the second magnetic detection element 82b is mounted is accommodated in the second accommodating portion 26b. In addition, the connector side lead 102 is provided in the second housing portion 26b. A board-side lead 86 extends outward in the axial direction Da from a main surface 80b of the board 80 opposite to the main surface 80a on which the second magnetic detection element 82b is mounted. Here, a plurality of connector-side leads TIG welding is performed on portions of 102 that are exposed to the outside in the axial direction Da.

  As shown in FIG. 5, the detection gear 60 is located radially outside the detection gear 60 relative to the permanent magnet 90, the first magnetic detection element 82 a, and the second magnetic detection element 82 b in the axial direction Da of the detection gear. Detection side step portions 64 a and 64 b that cause a step are formed continuously over the entire circumference of the detection gear 60. On the other hand, the first accommodating portion 26 a is formed with a bearing portion 27 a that faces the detection-side stepped portion 64 a in the radial direction of the detection gear 60. The bearing portion 27a is in contact with the detection-side stepped portion 64a such that the radially inner side of the detection gear 60 becomes the detection-side stepped portion 64a. Further, the second housing portion 26 b is formed with a bearing portion 27 b that faces the detection-side stepped portion 64 b in the radial direction of the detection gear 60. The bearing portion 27b is in contact with the detection side step portion 64b such that the radially inner side of the detection gear 60 becomes the detection side step portion 64b.

FIG. 6A shows a plan view of the second housing portion 26b, particularly the bearing portion 27b as viewed from the left side of FIG. 5, and FIG. 6B shows a cross-sectional view of the bearing portion 27b.
Here, the operation of the present embodiment will be described.

  As shown in FIG. 7, the permanent magnet 90 is arranged so that the center is positioned on the rotation center axis La. Here, the center of the object is the center of gravity when the density of the object is constant. The first magnetic detection element 82 a and the second magnetic detection element 82 b are arranged symmetrically with respect to the permanent magnet 90. That is, the center of each of the first magnetic detection element 82a and the second magnetic detection element 82b is arranged on the rotation center axis La. In addition, the distance between the first magnetic detection element 82a and the permanent magnet 90 and the distance between the second magnetic detection element 82b and the permanent magnet 90 are equal to each other. This is because the bearing shown in FIG. 5 is larger than the length D1 of the first magnetic detection element 82a and the second magnetic detection element 82b and the length D2 of the permanent magnet 90 in the radial direction of the detection gear 60. This is because the distance between the opposing portions of the portions 27a and 27b in the radial direction is increased. In other words, this is possible because the bearing portions 27 a and 27 b are provided outside the permanent magnet 90 in the radial direction of the detection gear 60.

  In this case, the amount of magnetic flux entering the first magnetic detection element 82a from the permanent magnet 90 and the amount of magnetic flux entering the second magnetic detection element 82b from the permanent magnet 90 are equal to each other. Therefore, the magnetic flux detection accuracy by each of the first magnetic detection element 82a and the second magnetic detection element 82b can be made equal. In FIG. 7, the magnetic flux of the permanent magnet 90 is schematically shown as Lmf.

  In addition, a single permanent magnet 90 is used as a permanent magnet whose magnetic flux is detected by the pair of magnetic detection elements of the first magnetic detection element 82a and the second magnetic detection element 82b. However, the number of parts can be reduced. For this reason, for example, in order to use the permanent magnet 90 having a high magnetic flux density in order to improve the SN ratio of magnetic flux detection, even if the permanent magnet 90 using an expensive rare earth element as a material is used, an increase in cost is suppressed. be able to.

  In the present embodiment, the magnetic flux detection of the permanent magnet 92 is also a pair of magnetic detections provided on the rotation center axis of the detection gear 70 and sandwiching the permanent magnet 92 of the detection gear 70 from both sides. Depending on the element. The detection gear 70 is also provided with step portions similar to the detection-side step portions 64a and 64b, and is arranged to face the bearing portions provided in the first housing portion 26a and the second housing portion 26b.

According to the present embodiment described above, the following effects can be obtained in addition to the effects according to the effects (1), (2), and (5) of the first embodiment.
(6) The detection side stepped portions 64 a and 64 b and the bearing portions 27 a and 27 b are arranged to face each other in the radial direction of the detection gear 60. As a result, the displacement of the detection gear 60 in the radial direction can be restricted by the bearing portions 27a and 27b.

  (7) The 1st accommodating part 26a was formed integrally with the 1st outer side insulator 20a, and the 2nd accommodating part 26b was formed integrally with the 2nd outer side insulator 20b. Thereby, it becomes possible to couple | bond the 1st accommodating part 26a and the 2nd accommodating part 26b by couple | bonding 1st stator S1 and 2nd stator S2.

<Other embodiments>
In addition, you may change at least 1 of each matter of the said embodiment as follows. Incidentally, the first rotating shaft in the column of “Means for Solving the Problems” corresponds to the input shaft 112, the second rotating shaft corresponds to the output shaft 116, and the first rotor corresponds to the rotor 114. The second rotor corresponds to the rotor 118.

・ About the gear housing
The gear housing 22a is not limited to one integrally formed with the first outer insulator 20a. For example, as shown in FIG. 8, the housing portion 23a of the detection gears 60, 70 is formed integrally with the first inner insulator 30a, and the housing portion 21a of the connector side lead 100 is formed integrally with the first outer insulator 20a. It is good also as a gear housing 22a by couple | bonding a pair of accommodating parts 21a and 23a.

  Furthermore, the connector-side lead 100, the first core 10a, the gear housing 22a, the first outer insulator 20a, and the first inner insulator 30a may be integrally formed by insert molding.

・ About the board housing
The substrate housing 22b is not limited to the one integrally formed with the second outer insulator 20b. For example, as shown in FIG. 8, the housing portion 23b of the board 80 is integrally formed with the second inner insulator 30b, and the housing portion 21b of the connector-side lead 102 is integrally molded with the second outer insulator 20b. 21b and 23b may be combined to form a substrate housing 22b.

  Further, the connector-side lead 102, the second core 10b, the board housing 22b, the second outer insulator 20b, and the second inner insulator 30b may be integrally formed by insert molding.

・ About the connector side lead
It is not restricted to what was illustrated in the said embodiment. For example, as illustrated in FIG. 9, it may be bent twice. In this case, a portion of the connector-side lead 100 that protrudes outward in the radial direction with respect to the detection gear 60 is exposed from the gear housing 22a, and the connector-side lead 102 of the connector-side lead 102 protrudes radially outward with respect to the substrate 80. This portion can be exposed from the substrate housing 22b. For this reason, in the state where the gear housing 22a and the substrate housing 22b are coupled, the length in the axial direction Da can be shortened as much as possible.

・ About the detection gear
The present invention is not limited to two detection gears 60 and 70 having different numbers of teeth. For example, it may be composed of two detection gears having the same number of teeth. Even in this case, for example, if the maximum rotation amount of the input shaft 112 is within one rotation of the detection gear, the output values of the magnetic detection elements 82 and 84 and the rotation angle of the input shaft 112 are paired. 1 can be associated. The detection gear may be a single gear. Even in this case, if the maximum rotation amount of the input shaft 112 is within 1/2 rotation of the detection gear, the output value of the single magnetic detection element that detects the magnetic flux of the magnet of the detection gear is The rotation angle of the input shaft 112 can be associated with one to one.

The detection gear is not limited to resin, but may be made of a metal that is a non-magnetic material, for example.
・ "About rotating gears"
The rotating gear 50 is not limited to being fixed to the input shaft 112 but may be fixed to the output shaft 116. Further, the rotating gear 50 may be made of, for example, a metal that is a non-magnetic material instead of being made of resin.

・ "Rotation side step part"
In the above embodiment, the rotation-side step portion 51 is formed by the groove 54, but the present invention is not limited thereto. For example, as illustrated in FIG. 10, the rotation-side step where the protrusions 25 a and 25 b are opposed to the outer side of the radial direction Dr while the rotation-side step portion 51 is opposed to the protrusions 25 a and 25 b on the inner side of the radial direction Dr. The structure which does not have the part 51 may be sufficient. On the contrary, while having the rotation side step part 51 which protrusion part 25a, 25b opposes to radial direction Dr outer side, it is the structure which does not have the rotation side step part 51 which protrusion part 25a, 25b opposes radial direction Dr inner side. There may be.

  The rotation-side stepped portion 51 is not limited to the one continuously formed over the entire circumference in the circumferential direction Dc, and for example, intermittently over the entire circumference like the bearing portion 27b illustrated in FIG. It may be formed. However, in this case, the gap between the adjacent rotation-side step portions 51 is made shorter than the lengths of the protrusions 25a and 25b in the circumferential direction Dc.

・ About the bearing
In 2nd Embodiment, although the bearing part (bearing part 27a, 27b) was provided in both the 1st accommodating part 26a and the 2nd accommodating part 26b, it is not restricted to this. For example, as shown in FIG. 11 in which the second housing portion 26b includes the bearing portion 27b and the first housing portion 26a does not include the bearing portion 27a, only one of them includes the bearing portion. Good. FIG. 11 is a cross-sectional view of the first housing portion 26a and the second housing portion 26b. In FIG. 11, members corresponding to the members shown in FIG. Yes.

  The bearing portion is not limited to being located outside the detection-side step portion in the radial direction of the detection gear, and may be located inside. This is illustrated in FIG. FIG. 12 is a cross-sectional view of the first housing portion 26a and the second housing portion 26b. In FIG. 12, members corresponding to those shown in FIG. In FIG. 12, in the radial direction of the detection gear 60, a bearing portion 28a of the first housing portion 26a and a bearing portion 28b of the second housing portion 26b are provided on the inner side of the detection side step portions 65a and 65b.

  Further, the bearing portion may include both a portion positioned outside and a portion positioned inside the detection side step portion in the radial direction of the detection gear. This is illustrated in FIG. FIG. 13 is a cross-sectional view of the first housing portion 26a and the second housing portion 26b. In FIG. 13, members corresponding to the members shown in FIG. In FIG. 13, in the radial direction of the detection gear 60, the detection side step portions 64a and 64b are opposed to each other such that the detection side step portions 64a and 64b are inside and the bearing portions 27a and 27b are outside, and the detection side step portions 65a and 65b are The bearing portions 28a and 28b are opposed to each other so that the bearing portions 28a and 28b are on the inside.

  In the second embodiment and each of the modifications described above, the bearing portions such as the bearing portions 27a, 27b, 28a, and 28b are continuously provided over the entire circumference in the circumferential direction of the detection gear 60 and the detection gear 70. Instead of forming, the bearing portion may be formed intermittently over the entire circumference in the circumferential direction as illustrated in FIG. 14 for a modification of the bearing portion 27b. 14 (a) and 14 (b) correspond to FIGS. 6 (a) and 6 (b).

  As a bearing part, it is not restricted to what opposes a detection side level | step-difference part. For example, as shown in FIG. 15, it may be opposed to teeth 62 formed on the outer periphery in the radial direction of the detection gear. This is illustrated in FIG. FIG. 15 is a cross-sectional view of the first housing portion 26a and the second housing portion 26b. In FIG. 15, members corresponding to those shown in FIG. As shown in FIG. 15, the outer peripheral surface 62a of the tooth 62 of the detection gear 60 faces the bearing portion 29a of the first housing portion 26a and the bearing portion 29b of the second housing portion 26b. FIG. 16 is a perspective view of the bearing portions 29a and 29b. Even when the bearing portion is opposed to the outer peripheral surface of the teeth of the detection gear, it is essential that the bearing portion is formed in both the first housing portion 26a and the second housing portion 26b. Instead, it may be formed on only one of them.

  Further, the bearing portion is not limited to the one formed in at least one of the first housing portion 26a and the second housing portion 26b. For example, the bearing portion protrudes from the main surface 80a of the substrate 80 or from the main surface 81a of the substrate 81. It may be protruded.

・ About the detection side step
In the second embodiment and the modifications thereof, the detection side stepped portions 64a, 64b, 65a, 65b are continuously formed over the entire circumference of the detection gear 60, but this is not restrictive. For example, except for the case of the modification illustrated in FIG. 14, the detection-side stepped portion may be formed intermittently over the entire circumference.

Note that the detection side stepped portion formed in the detection gear 70 can be modified in the same manner as the detection side stepped portions 64a, 64b, 65a, 65b.
・ About magnets
The orientation of the permanent magnets 90 and 92 is not limited to that illustrated in FIG. 7, and may be, for example, that illustrated in FIG. 17.

・ "Method to regulate radial displacement of rotating gear"
In the above-described embodiment, the first stator S1 side protrusion 25a and the second stator S2 side protrusion 25b are both inserted into the groove 54. However, the present invention is not limited to this, for example, the first stator S1 side protrusion 25a. Alternatively, only one of the protrusions 25b on the second stator S2 side may be inserted into the groove 54.

  In the above-described embodiment, the protrusion 25a is inserted into the groove 54 to restrict the rotation gear 50 from being displaced in the radial direction Dr. However, the present invention is not limited to this. For example, a protrusion protruding in the axial direction may be provided on the rotating gear 50 along the entire circumference, and the protrusion may be accommodated between the protrusion 25a and the covering portion of the back yoke 14a. In this case, the protrusion of the rotating gear 50 can restrict the rotating gear 50 from being displaced in the radial direction Dr.

・ "Gear arrangement"
It is not restricted to what arrange | positions the axis | shaft of the rotating gear 50, and the axis | shaft of the gears 60 and 70 for a detection in parallel. For example, the axes of the detection gears 60 and 70 may be arranged orthogonal to the axis of the rotary gear 50. In this case, the gear housing 22a and the substrate housing 22b may be arranged so as to extend parallel to the axial direction of the rotating gear 50.

  S1 ... 1st stator, S2 ... 2nd stator, 10a, 10b ... Core, 12a, 12b ... Teeth, 14a, 14b ... Back yoke, 18a, 18b ... Coil, 20a, 20b ... Outer insulator, 21a, 21b ... Housing part , 22a ... gear housing, 22b ... substrate housing, 23a, 23b ... housing part, 24a, 24b ... teeth covering part, 25a, 25b ... projection, 30a, 30b ... inner insulator, 40 ... stator unit, 42 ... bushing, 44 ... Fitting part, 46 ... insertion hole, 50 ... rotary gear, 52 ... tooth, 54 ... groove, 60 ... detection gear, 62 ... tooth, 70 ... detection gear, 72 ... tooth, 80 ... substrate, 80a, 80b ... principal surface, 82, 84 ... magnetic detection element, 86 ... substrate side lead, 90, 92 ... permanent magnet, 100, 102 ... connector side lead, 10 ... torsion bar, 112 ... input shaft, 114 ... rotor, 116 ... output shaft, 118 ... rotor.

Claims (11)

A first rotating shaft and a second rotating shaft connected via a torsion bar;
A first stator disposed opposite to a first rotor provided on the first rotation shaft;
A second stator disposed opposite to a second rotor provided on the second rotating shaft;
A rotating gear fixed to one of the first rotating shaft and the second rotating shaft;
A detection gear engaged with the rotating gear and provided with a magnet;
A magnetic detection element that outputs an output signal corresponding to the relative rotation with the magnet due to the rotation of the detection gear accompanying the rotation of the rotation gear,
The first stator has a first core, a first insulator covering the first core, and a first coil wound around the first core via the first insulator,
The second stator has a second core, a second insulator covering the second core, and a second coil wound around the second core via the second insulator,
The electric signal of the first coil and the electric signal of the second coil corresponding to the rotation angle difference between the first rotating shaft and the second rotating shaft are detected values of torque applied to the torsion bar,
The output signal of the magnetic detection element is the rotation angle of either one of the first rotation shaft and the second rotation shaft,
The rotating gear is disposed between the first stator and the second stator;
A torque angle detection device in which the first insulator and the second insulator are coupled and the first stator, the second stator, and the rotating gear are arranged coaxially. Each of the first core and the second core is formed with teeth along the circumferential direction,
A protrusion that restricts the first coil from being wound around the teeth covering portion, which is the portion covering the teeth, of the first insulator, and the first coil being displaced radially inward of the first insulator. Part is formed,
A protrusion that restricts the second coil from being wound around the teeth covering portion, which is a portion covering the teeth, of the second insulator, and the second coil being displaced radially inward of the second insulator. Part is formed,
The rotating gear is formed with a rotation-side step portion that generates a step in the axial direction of the rotating gear over the entire circumference in the circumferential direction of the rotating gear, the rotation-side step portion, the first stator, and the The torque angle detection device according to claim 1, wherein at least one of the protrusions of the second stator is disposed to face the radial direction. On the radially outer side of the first insulator and the second insulator, a housing portion for housing the detection gear is coupled,
The magnet is provided on the rotation center axis of the detection gear,
3. The torque angle detection device according to claim 1, wherein the magnetic detection element includes a first magnetic detection element and a second magnetic detection element provided on both sides of the detection gear on the rotation center axis. 4. .   The torque angle detection device according to claim 3, further comprising a bearing portion of the detection gear outside the magnet in a radial direction of the detection gear. The accommodating portion includes a first accommodating portion disposed on the radially outer side of the first insulator, and a second accommodating portion disposed on the radially outer side of the second insulator,
In the detection gear, a detection-side step portion that causes a step in the axial direction of the detection gear is formed over the entire circumference of the detection gear,
The bearing portion is formed in at least one of the first housing portion and the second housing portion,
The detection-side step portion and the bearing portion are arranged to face each other in the radial direction of the detection gear;
The torque angle detection device according to claim 4, wherein the first housing portion and the second housing portion are coupled. The accommodating portion includes a first accommodating portion disposed on the radially outer side of the first insulator, and a second accommodating portion disposed on the radially outer side of the second insulator,
The bearing portion is formed in at least one of the first housing portion and the second housing portion,
The bearing portion is opposed to the outer peripheral surface located on the radially outer side of the teeth of the detection gear,
The torque angle detection device according to claim 4, wherein the first housing portion and the second housing portion are coupled. The first housing is coupled to the first insulator;
The torque angle detection device according to claim 5 or 6, wherein the second housing portion is coupled to the second insulator. The first magnetic detection element is mounted on a substrate,
The main surface of the substrate is arranged to face the detection gear in the axial direction of the detection gear,
The substrate is housed in the first housing portion;
The first housing portion is provided with connector-side leads that extend by bending to the radially outer side and the axially outer side,
The torque angle detection device according to claim 7, wherein a board-side lead extending so as to protrude from the main surface of the board is joined to a portion of the connector-side lead that extends outward in the axial direction. The magnetic detection element is mounted on a substrate,
The main surface of the substrate is arranged to face the detection gear in the axial direction of the detection gear,
A gear housing that accommodates the detection gear is coupled to the first insulator on a radially outer side of the first stator,
A substrate housing that accommodates the substrate is coupled to the second insulator on a radially outer side of the second stator,
The torque angle detection device according to claim 1 or 2, wherein the gear housing and the substrate housing are coupled.   The torque angle detection device according to claim 9, wherein an axis of the rotating gear and an axis of the detection gear are arranged in parallel to each other. The board housing is provided with connector-side leads that extend by bending to the radially outer side and the axially outer side,
The torque angle detection device according to claim 9 or 10, wherein a board-side lead extending so as to protrude from the main surface of the board is joined to a portion of the connector-side lead that extends outward in the axial direction.

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