JP5798971B2 - Torque sensor - Google Patents

Description

  The present invention relates to a torque sensor that is applied to, for example, a power steering apparatus for a vehicle and detects a steering torque of a driver.

  For example, as a conventional torque sensor applied to a power steering device of an automobile, one described in Patent Document 1 below is known.

  Briefly, the torque sensor includes first and second rotors assembled in series with a torsion bar, first and second bobbins disposed on the outer peripheral side of each rotor, and each bobbin. A pair of first and second stators composed of first and second stator cores respectively fixed to the outer periphery and first and second stator coils wound around the stator cores. The steering torque by the driver is detected by detecting the load torque acting on the torsion bar based on the difference in the detection angle of the second resolver.

JP 2004-294265 A

  Here, the above-described torque sensor is connected to the control board via a plurality of connection terminals in which end portions of the respective stator coils subjected to the connection processing are held and fixed by the respective bobbins.

  However, in the conventional torque sensor, since the shape of each bobbin and the layout of each connection terminal are not considered at all, the shape of each bobbin is different. Even when a molding die is required or when the shape of each bobbin is the same, if it is necessary to extend each connection terminal along the axial direction of the bobbin, the holding part for each connection terminal Therefore, there is a problem that the holding portions of the connection terminals are increased in size.

  The present invention has been devised in view of such technical problems, and the terminal holding portion in the case where each connection terminal is arranged along the axial direction of each bobbin while using a common mold for each bobbin. A torque sensor that can suppress an increase in size in the circumferential direction is provided.

  The present invention is applied to an input shaft and an output shaft connected by a torsion bar, and is fixed to the input shaft using first and second resolvers arranged in series on the outer periphery of each shaft. A torque sensor for detecting torque generated in the torsion bar based on a relative rotation angle between the first rotor and the second rotor fixed to the output shaft, each of which constitutes the detection side of the first and second resolvers The first and second bobbins used for the stator configuration are formed to include first and second bobbin bodies and first and second terminal holding portions having substantially the same shape, and to the control board of the first detection coil. The first connection terminal for connection to the first terminal holding portion is directed to the first terminal holding portion, and the second connection terminal for connection to the control board of the second detection coil is directed to the second terminal holding portion, respectively, in the same axial direction. Hold and fix, and It is characterized by being configured so as to project from the first connection terminal as well as the first terminal holding portion in the form of penetrating the first terminal holding portion for the second connection terminal.

  According to the present invention, since the first and second bobbins are configured to have substantially the same shape, it is possible to share the forming dies of both bobbins. Thereby, it can contribute to expansion of productivity of a sensor and reduction in manufacturing cost.

  Further, in both the bobbins, the circumferential positions of the two terminal holding portions are overlapped between the axial directions so as to extend the second connection terminal through the first terminal holding portion. Thus, the circumferential region occupied by the two terminal holding portions can be reduced, and the sensor can be miniaturized.

It is a longitudinal cross-sectional view which shows the assembly | attachment state of the torque sensor which concerns on 1st Embodiment of this invention. It is a perspective view which shows the structure of the torque sensor shown in FIG. It is a principal part rear view of the torque sensor shown in FIG. FIG. 3 is an exploded perspective view of a stator unit and a control board shown in FIG. 2. (A) is a bottom view of the stator unit shown in FIG. 4, and (b) is a cross-sectional view taken along the line AA of FIG. It is the BB sectional view taken on the line of Fig.5 (a). It is a perspective view of the housing shown in FIG. It is a figure equivalent to the BB line section of Drawing 5 (a) concerning the modification of a 1st embodiment of the present invention. It is a figure equivalent to the BB line section of Drawing 5 (a) concerning a 2nd embodiment of the present invention.

  Hereinafter, embodiments of a torque sensor according to the present invention will be described in detail with reference to the drawings. In the following embodiments and the like, an example in which this torque sensor is applied to a rack and pinion type electric power steering device of an automobile will be described as an example.

  That is, as shown in FIGS. 1 and 2, the electric power steering apparatus includes an input shaft 1 (one first rotating shaft according to the present invention) whose one end side (the upper end side in the figure) is linked to a steering wheel (not shown). And the output shaft 2 linked to the steered wheels through a rack and pinion mechanism (rack bar), which is partially not shown in the drawing, relative to each other by a so-called torsion bar 3. A sensor unit 10 for driving control of an electric motor (not shown) that generates steering assist torque is disposed in the vicinity of the connecting portion where the two shafts 1 and 2 face each other.

  The sensor unit 10 is provided so as to straddle the connecting portion of both the shafts 1 and 2, and a first resolver 20 disposed on the input shaft 1 side and a second resolver 30 disposed on the output shaft 2 side. A torque sensor 11 for detecting the load torque acting on the torsion bar 3 from the difference in the detected angle, and the steering torque is calculated based on the detected value of the torque sensor 11 for driving control of an electric motor (not shown). A control board 12 to be provided, and a steering angle sensor 13 that is disposed at a position opposite to the axial direction of the torque sensor 11 across the control board 12 and detects a steering angle by a driver, Both the sensors 11 and 13 are electrically connected to the control board 12 to drive and control the electric motor based on the detection results of the sensors 11 and 13. Appropriate steering assist torque corresponding to the operating condition is applied (output) for.

  The torque sensor 11 is configured such that the first and second resolvers 20 and 30 are integrally housed and held in a housing 40, and a pair of flange sensors 41 provided at one end opening of the housing 40 are provided. It is attached and fixed to the electric power steering device through the attachment holes 42 and 42. At this time, the housing 40 is configured to be fitted to both the resolvers 20 and 30 by press-fitting or shrink-fitting, so that stress is applied almost uniformly to the entire circumference of the housing 40 during the fitting. As a result, the adverse effect on the roundness of the housing 40 is reduced.

  The first resolver 20 is a so-called variable reluctance type resolver, which is fixed to the outer periphery of the other end of the input shaft 1 and has a concavo-convex provided on the outer periphery of the first resolver 20 with a first stator 22 described later. The first rotor 21 made of a conductive material having a gap constituting portion 21a that constitutes a gap that changes in a continuous manner, and a first radial gap that is disposed on the outer peripheral side of the first rotor 21 with a predetermined radial gap therebetween. A first stator 22 that detects a rotation angle of the first rotor 21 by detecting a change in a radial gap of a magnetic field formed between the coil 24b and the gap constituting portion 21a with the detection coil 24b. It is mainly composed. In this way, the rotation angle of the first rotor 21 is detected by detecting the change in the radial gap of the magnetic field formed between the first detection coil 24 b and the first rotor 21. By configuring as a variable reluctance type resolver to be detected, there is no need to connect a power source to the first rotor 21, and there is an advantage that the configuration of the torque sensor 11 can be simplified (the second resolver 30 described later is also described above). The same).

  The first stator 22 is a primary coil in a coil winding portion (not shown) that is provided in a plurality (six in this embodiment) on the inner peripheral portion of a first stator core 23 that is formed in a substantially annular shape. A first coil unit C1 formed by alternately winding a first excitation coil 24a and a first detection coil 24b, which is a secondary coil, and an outer peripheral side of the first rotor 21 with the predetermined radial gap therebetween, The first coil unit C1 is accommodated by a first coil accommodating portion 26a formed in the outer peripheral portion of the main body 26 (a first bobbin main body according to the present invention, which will be referred to as a first bobbin main body hereinafter). A first bobbin 25 formed by molding an insulating material such as synthetic resin to be held, and held and fixed to a first terminal holding portion 27 protruding from a predetermined position in the circumferential direction of the first bobbin main body 26. Multiple (this embodiment It is connected to the control board 12 via the first connection terminal P1 and the third connection terminal P3 of the three).

  Here, as shown in FIGS. 4 and 6, each of the first and third connection terminals P1 and P3 is configured as a connection terminal having a substantially rectangular cross section and a fixed vertical and horizontal width. The end portions of the coils 24 a and 24 b drawn from the first bobbin main body 26 are connected to the one end portions held and fixed to the first terminal holding portion 27. That is, the first detection coil 24b is connected to one end of the first connection terminal P1, and the first excitation coil 24a is connected to the third connection terminal P3.

  The first terminal holding portion 27 is substantially rectangular by projecting a part in the circumferential direction at the inner end of the first bobbin 26 (the end on the side facing the second bobbin 35 described later) outward in the radial direction. The first terminal holding part 27 is formed in a plate shape, and a plurality of (in this embodiment, a total of six) firsts for holding and fixing the first and third connection terminals P1 and P3 are provided in the first terminal holding part 27. A first terminal holding hole group H1 which is a set of terminal holding holes 28 and a plurality (six in this embodiment) of second terminal holding holes for inserting and holding second and fourth connection terminals P2 and P4 described later. The second terminal holding hole group H2, which is a set of 29, is arranged in two rows in the radial direction of the first bobbin 25 (the first terminal holding hole group H1 is on the inner peripheral side, and the second terminal holding hole group H2 is on the outer peripheral side). Further, it is formed so as to penetrate along the axial direction of the input shaft 1.

  Each of the first terminal holding holes 28 has an inner diameter slightly smaller than the diagonal dimensions of the first and third connection terminals P1, P3 having a substantially rectangular cross section as shown in FIG. The first and third connection terminals P1 and P3 are fixed by press-fitting. On the other hand, each of the second terminal holding holes 29 is set to have an inner diameter slightly larger than diagonal dimensions of second and fourth connection terminals P2 and P4 described later. The terminals P2 and P4 are configured to be inserted with the radial gap R.

  The second resolver 30 is also a variable reluctance type resolver having the same configuration as the first resolver 20, and is fixed to the outer periphery of the other end of the output shaft 2 as shown in FIGS. A second rotor 31 made of a conductive material having a second gap constituting portion 31a that is the same gap constituting portion as the first rotor 21 on the outer peripheral portion, and a predetermined radial clearance on the outer peripheral side of the second rotor 31. And a second stator 32 that detects a rotation angle of the second rotor 31 by a second detection coil 34b described later.

  The second stator 32 is a bobbin main body 36 of a second bobbin 35 formed by molding an insulating material such as synthetic resin into substantially the same shape as the first bobbin 25 (the second bobbin main body according to the present invention). The second coil unit C2 configured in the same manner as the first coil unit C1 is housed and held in the second coil housing portion 36a formed in the outer peripheral portion of the second bobbin main body. A plurality of (this embodiment) held and fixed to a second terminal holding portion 37 protruding in a manner overlapping with the first terminal holding portion 27 in the axial direction at a predetermined position in the circumferential direction of the bobbin main body 36. It is connected to the control board 12 via the third connection terminal P2 and the fourth connection terminal P4.

  Here, each of the second and fourth connection terminals P2 and P4 is configured as a connection terminal having a substantially cylindrical shape having a certain vertical and horizontal width and having a certain vertical and horizontal width as shown in FIGS. The end portions of the coils 34a and 34b drawn from the second bobbin main body 36 are connected to one end portions held and fixed to the second terminal holding portion 37, respectively. That is, the second detection coil 34b is connected to one end of the second connection terminal P2, and the first excitation coil 34a is connected to the fourth connection terminal P4.

  The second terminal holding portion 37 is a substantially rectangular plate by projecting a part in the circumferential direction at the inner end portion (the end portion facing the first bobbin 25) of the second bobbin 35 outward in the radial direction. The second terminal holding part 37 is formed in a shape, and the horizontal direction position corresponding to the second terminal holding hole group H2 overlapping with the second terminal holding hole group H2 in the axial direction is arranged in the horizontal direction. A third terminal holding hole group H3, which is a set of a plurality of (in this embodiment, a total of six) third terminal holding holes 38 for holding and fixing the second and fourth connection terminals P2 and P4, is further provided in the axial direction. A plurality (six in this embodiment) of fourth terminals in which any of the connection terminals P1 to P4 described above is not inserted into the horizontal position corresponding to the first terminal holding hole group H1 overlapping with the one terminal holding hole group H1. Fourth terminal holding hole group H4, which is a set of holding holes 39 The second bobbin 35 penetrates along the axial direction of the output shaft 2 in two rows (the fourth terminal holding hole group H4 is on the inner peripheral side and the third terminal holding hole group H3 is on the outer peripheral side). Is formed.

  Each of the third and fourth terminal holding holes 38 and 39, as shown in FIG. 6 in particular, is larger than the diagonal dimensions of the second and fourth connection terminals P2 and P4 having a substantially rectangular cross section. The inner diameter is set to be slightly smaller, and the second and fourth connection terminals P2 and P4 are fixed by press-fitting in the third terminal holding hole 38.

  As described above, in the first and second stators 22 and 32, both bobbins 25 and 35 are formed in substantially the same shape, and the circumferential positions of both terminal holding portions 27 and 37 coincide with each other ( The first and third connection terminals P1 and P3 are held and fixed at the first terminal holding holes 27 (first terminal holding hole group H1) and the other end side is fixed. The second and fourth connection terminals P2 and P4 extend upward (on the input shaft 1 side), and one end side is held and fixed in each third terminal holding hole 38 (third terminal holding hole group H3), and the other end side is Each second terminal holding hole 29 (second terminal holding hole group H2) penetrates and extends upward.

  The other end sides of the extended connection terminals P1 to P4 are electrically connected to the control board 12 by being inserted into the through holes 12a of the control board 12 and soldered. (See FIG. 4). In addition, by directly connecting the terminals P1 and P2 to the control board 12 in this way, it is possible to omit parts such as a harness that are in the middle, simplifying the structure of the power steering device and reducing the manufacturing cost. It is used for conversion.

  Further, as shown in FIGS. 3 and 7, the peripheral retaining wall of the housing 40 escapes the terminal holding portions 27 and 37 of both bobbins 25 and 35 by notching in a concave shape along the axial direction from the opening end side. A rectangular cutout 43 is provided so that both terminal holding portions 27 and 37 are exposed to the outside. In addition, by forming the notch 43 that may cause such a decrease in rigidity on the peripheral wall instead of the end wall of the housing 40, it is possible to ensure good roundness and strength of the housing 40. . And the said notch part 43 is comprised so that the predetermined circumferential clearance X slightly smaller than the said radial clearance R may be formed between the side parts 27a and 37a of each terminal holding part 27 and 37. The relative circumferential displacement of the bobbins 25 and 35 (both coil units C1 and C2) can be managed with the circumferential gap X.

  On the other hand, on the lower surface 37b of the second terminal holding portion 37 facing the bottom surface 43a of the cutout portion 43 when the housing 40 is fitted, as shown in FIGS. A plurality of relief grooves 37c (quantity corresponding to the number of coil wires) used for burying the end portions of the coils 34a and 34b drawn from the side cross the notch 43 in the radial direction. Notches are formed. With this configuration, even when the gap between the both surfaces 37b and 43a is set smaller than the wire diameter of each of the coils 34a and 34b, the coils 34a and 34b are sandwiched between the both surfaces 37b and 43a. Can be avoided.

  Further, as shown in FIG. 5 (a), recesses 22a and 32a that are recessed inward in the radial direction are respectively provided at the circumferential positions of the stators 22 and 32 that are symmetrical with respect to the terminal holding portions 27 and 37. As shown in FIG. 7, as shown in FIG. 7, both the recesses 22 a and 32 a are engaged with the recesses 22 a and 32 a in the circumferential direction corresponding to the recesses 22 a and 32 a which are formed along the direction and symmetrical with the notch 43 of the housing 40. The projecting portion 44 is formed so as to protrude radially inward. Note that the backlash (circumferential gap) between the concave and convex portions 22a, 32a, 44 is also larger than the radial gap R formed between the second and fourth connection terminals P2, P4 and the second terminal insertion hole 29. It is comprised so that it may become small, and the relative position shift of the circumferential direction of both the said coil units C1 and C2 is manageable with the said notch part 43. FIG.

  According to the torque sensor 11 configured as described above, the first bobbin 25 and the second bobbin 35 are configured to have substantially the same shape, so that the forming dies of both the bobbins 25 and 35 are shared. Can be achieved. Thereby, it is possible to contribute to an increase in productivity of the torque sensor 11 and a reduction in manufacturing cost.

  Furthermore, in both the bobbins 25 and 35, the circumferential directions of the two terminal holding portions 27 and 37 so as to extend the second and fourth connection terminals P2 and P4 through the first terminal holding portion 27. By configuring the positions to overlap between the axial directions, the circumferential region occupied by the two terminal holding portions 27 and 37 can be reduced, and the torque sensor 11 can be miniaturized. In other words, when the unique configuration in which the second and fourth connection terminals P2 and P4 penetrate the first terminal holding portion 28 is not adopted, the terminal holding portions 27 and 37 are moved in the circumferential direction. Inevitably, the two terminal holding portions 27 and 37 occupy a circumferential region that is increased by being shifted from each other.

  Further, in the present embodiment, the notch 43 of the housing 40 and each terminal holding portion 27 with respect to the radial gap R formed between the second and fourth connection terminals P2, P4 and the second terminal insertion hole 29. , 37 so that the circumferential gap formed between the stators 22 and 37 is smaller. The second connection terminal P2 can be automatically inserted into each second terminal holding hole 29. Thereby, the operation of inserting the second and fourth connection terminals P2 and P4, which tend to be complicated, into the second terminal holding holes 29 can be easily performed.

  Further, when the housing 40 is fitted to both the stators 22 and 32, the lower surface 37b of the second terminal holding portion 37 facing the bottom surface 43a of the notch 43 is formed so as to straddle the notch 43 when the housing 40 is fitted. Since the respective escape grooves 37c are provided, the end portions of the coils 34a and 34b drawn out from the second bobbin main body 36 side when fitted are inserted into the respective escape grooves 37c, and the second terminals It is possible to avoid inconveniences such as being sandwiched between the lower surface 37b of the holding portion 37 and the bottom surface 43a of the notch portion 43 and being disconnected. Thereby, it is used for ensuring good productivity of the torque sensor 11 and improving the yield.

  In addition, since the housing 40 and the two coil units C1 and C2 are configured to engage with each other with the concave and convex portions 22a, 32a and 44, the concave and convex portions of the two coil units C1 and C2 are engaged. Both the coil units C1 and C2 and the housing 40 can be assembled while restricting the positional deviation in the circumferential direction, and good workability related to the assembly including the terminal insertion work as well as the positioning by the notch 43 is achieved. It can be secured. In particular, in the case of the concave-convex engagement, since the coil units C1 and C2 are provided over the entire axial direction, there is an advantage that more effective positioning can be obtained in the assembly.

  FIG. 8 shows a modification of the first embodiment of the torque sensor 11 according to the present invention, in which the shapes of the connection terminals P1, P2 according to the first embodiment are changed.

  That is, in this modification, only the holding portions (holding ranges) P1a and P3a by the first terminal holding holes 28 of the first and third connection terminals P1 and P3 are set to the outer diameter dimensions that can be press-fitted, and the remaining This part (axial range) is set to an outer diameter dimension that is non-press-fit so that it can be easily inserted into each first terminal holding hole 28.

  Similarly, with respect to the second and fourth connection terminals P2 and P4, only the holding ranges P2b and P4b by the second and third terminal holding holes 29 and 38 are set to the same outer diameter as in the first embodiment. The remaining axial range is set to an outer diameter dimension that is non-press-fit and can be easily inserted into the second and third terminal holding holes 29 and 38.

  As described above, in this modification, only the portions P1a, P3a, P2b, and P4b used for holding the terminal holding holes 28, 29, and 38 are formed with a large diameter, and the remaining portions are formed with a relatively small diameter. This makes it possible to more easily insert the connection terminals P1 to P4 into the terminal holding holes 28, 29, and 38, thereby further improving the assembling property of the torque sensor 11. it can.

  FIG. 9 shows a second embodiment of the torque sensor 11 according to the present invention, in which the fourth terminal holding hole 39 in the first embodiment is omitted.

  That is, in the present embodiment, it is possible to improve the material yield by adopting a configuration in which the unnecessary fourth terminal holding hole 39 that does not function at all in the second terminal holding portion 37 is not formed. This also serves to suppress inconvenience such as a decrease in rigidity caused by providing the four-terminal holding hole 39.

  In the case of the present embodiment, with the abolition of the fourth terminal holding hole 39, the first terminal holding hole 28 corresponding to the fourth terminal holding hole 39 of the first terminal holding portion 27 is additionally processed. In this way, the unique effects of the present invention can be achieved such that the mold can be shared.

  The present invention is not limited to the configuration of each of the above embodiments. For example, the specific shape of each of the bobbins 25 and 35, each of the connection terminals P1 to P4, and each of the terminal holding holes for inserting or holding the same. Configurations that are not directly related to the essence of the present invention, such as the numbers 28, 29, 38, and 39, can be arbitrarily changed according to the specifications of the torque sensor 11 and the like.

  Technical ideas other than those described in the scope of claims understood from each of the embodiments will be described below.

(A) The torque sensor according to claim 1,
The first rotor and the second rotor are formed such that a radial gap between the first detection coil and the second detection coil periodically changes in a rotation direction,
The torque sensor according to claim 1, wherein the first detection coil and the second detection coil detect a change in the radial gap of a magnetic field formed between the first rotor and the second rotor, respectively.

  With this configuration, it is not necessary to connect a power source to the first and second rotors, and the configuration of the sensor can be simplified.

(B) The torque sensor according to claim 1,
The first and second connection terminals are formed to have a relatively large diameter only for the axial range inserted through the terminal holding hole groups, and the remaining range is used for the press fitting into the terminal holding hole groups. A torque sensor characterized in that it is formed in a relatively small diameter that is not press-fitted into each terminal holding hole group.

  Thus, by forming the range that is not held by each terminal holding hole with a relatively small diameter, it is possible to more easily insert each connection terminal into each terminal holding hole, and to install the torque sensor. The property can be further improved.

(C) The torque sensor according to claim 1,
The other end side of the first and second connection terminals is directly connected to the control board.

  By connecting each connection terminal directly to the control board in this way, it is possible to eliminate a part such as a harness that is interposed in the middle, and the structure is simplified and the manufacturing cost is reduced.

(D) The torque sensor according to claim 1,
The housing has a notch portion that integrally avoids the both terminal holding portions, and is configured to fit the bobbin in a way that avoids the both terminal holding portions via the notch portions. Torque sensor characterized by

  With this configuration, the housing can be assembled from one side in the axial direction with the notch as a guideline, so that good workability can be obtained.

  In addition, since the said notch part is formed in the surrounding wall of a housing and is not formed in an end wall, it is used also for ensuring the favorable roundness and intensity | strength of the said housing.

(E) The torque sensor according to (d),
The radial gap between each second connection terminal and each second terminal holding hole is set to be larger than the radial gap between the notch and each terminal holding part. Torque sensor.

  With this configuration, it is possible to manage the relative circumferential displacement of the bobbins with the circumferential gap between the notch portion and each terminal holding portion, and the second based on the displacement. Complicating the insertion operation of the connection terminal into the second terminal holding hole can be avoided.

(F) The torque sensor according to claim 1,
The torque sensor according to claim 1, wherein the housing is configured to be fitted onto the bobbins by press fitting or shrink fitting.

  As described above, since the housing is configured to be fitted onto the bobbin by press fitting or shrink fitting, stress is applied almost uniformly to the entire circumference of the housing during the fitting, which has an adverse effect on the roundness. Served for reduction.

(G) The torque sensor according to claim 1,
A torque characterized in that an engagement convex portion protruding in a radial direction is provided on an inner peripheral portion of the housing, and an engagement concave portion engageable with the engagement convex portion is provided on an outer peripheral portion of each bobbin. Sensor.

  With this configuration, particularly when the housing is fitted to both the bobbins, the circumferential displacement of both bobbins is regulated by the engagement of the concave and convex portions, and the housing is fitted to both bobbins. It becomes possible to do. As a result, it is possible to ensure good assembling of the housing with respect to both bobbins.

(H) The torque sensor according to claim 1,
A torque sensor characterized in that a groove formed so as to straddle the notch is provided between the inner and outer peripheries of the housing on the surface of at least one terminal holding part facing the notch of the housing. .

  By providing such a groove portion, when the housing is fitted to both the bobbins, the lead wire of the detection coil enters into the groove portion and is broken between the notch portion and the terminal holding portion. It is possible to avoid problems. Thereby, it is used for ensuring good productivity of the sensor and improving the yield.

1 ... Input shaft (first rotation shaft)
2 ... Output shaft (second rotary shaft)
3 ... Torsion bar 11 ... Torque sensor 12 ... Control board 21 ... 1st rotor 24b ... 1st detection coil 25 ... 1st bobbin 26 ... 1st bobbin main body 27 ... 1st terminal holding part 28 ... 1st terminal holding hole 29 ... 2nd terminal holding hole 31 ... 2nd rotor 34b ... 2nd detection coil 35 ... 2nd bobbin 36 ... 2nd bobbin main body 37 ... 2nd terminal holding part 38 ... 3rd terminal holding hole 40 ... Housing H1 ... 1st terminal holding Hole group H2 ... second terminal holding hole group H3 ... third terminal holding hole group P1 ... first connection terminal P2 ... second connection terminal

Claims (3)

A rotating shaft composed of a first rotating shaft and a second rotating shaft connected via a torsion bar;
A housing that rotatably accommodates the rotating shaft therein;
A first rotor fixed to the outer periphery of the first rotating shaft;
A second rotor fixed to the outer periphery of the second rotating shaft;
A first bobbin main body made of an insulating material formed in a substantially cylindrical shape surrounding the first rotor, and a first terminal holding portion made of the insulating material extending radially outward from the first bobbin main body And a first bobbin formed by molding and fixed to the housing;
A first detection coil provided on the first bobbin main body for detecting a rotational position of the first rotor;
A first terminal holding hole group which is a plurality of axial holes formed in the first terminal holding part;
A second terminal holding hole group which is a plurality of axial through holes formed in the first terminal holding part;
A second bobbin main body and a second terminal holding part formed by molding with an insulating material so as to have substantially the same shape as the first bobbin main body and the first terminal holding part; and the second terminal holding part A second bobbin fixed to the housing so as to substantially overlap with the first terminal holding portion in the axial direction of the rotation shaft;
A plurality of axial holes provided in the second terminal holding portion, and a third terminal holding hole group provided so as to substantially overlap with the second terminal holding hole group in the axial direction of the rotating shaft;
A second detection coil provided on the second bobbin main body for detecting a rotational position of the second rotor;
One end side in the axial direction is fitted into the first terminal holding hole group and the other end side is erected in a direction protruding from the first terminal holding part in the opposite direction to the second terminal holding part. A first connection terminal made of a conductive material whose ends are electrically connected;
One end side in the axial direction is fitted into the third terminal holding hole group, and the other end side extends through the second terminal holding hole group and protrudes from the first terminal holding portion in the same direction as the first connection terminal. And a second connection terminal made of a conductive material to which an end of the second detection coil is electrically connected,
A torque sensor that detects torque generated in the torsion bar based on a relative rotation angle between the first rotor and the second rotor.   The second bobbin is a plurality of axial through-holes provided in the second terminal holding part, and is provided so as to substantially overlap with the first terminal holding hole group in the axial direction of the rotating shaft. The torque sensor according to claim 1, further comprising a terminal holding hole group. A first exciting coil provided in the first bobbin and supplied with an exciting current whose voltage periodically changes;
A second excitation coil provided on the second bobbin and supplied with an excitation current whose voltage periodically changes;
One end side in the axial direction is inserted into the first terminal holding hole group and the other end side is erected in the same direction as the first connection terminal, and the end of the first exciting coil is electrically connected. A third connection terminal made of a conductive material,
One end side in the axial direction is fitted into the third terminal holding hole group, and the other end side extends through the second terminal holding hole group and protrudes from the first terminal holding portion in the same direction as the first connection terminal. A fourth connection terminal made of a conductive material provided and electrically connected to an end of the second excitation coil;
The torque sensor according to claim 1, further comprising:

Images