JP2019086309A - Rotation angle detector - Google Patents

Abstract

To provide a rotation angle detector which can prevent a magnet in a holder from coming off, with a simple constitution.SOLUTION: The rotation angle detector includes: a support member 30 which has a rotation axis support part; a holder 32 which has a driven part supported on the rotation axis support part so as to be rotatable around a rotation axis and has a driven part for receiving a rotational driving force around the rotation axis in accordance with a prescribed movement of an operation member, and has a recess recessed in a direction of the rotation axis; and a magnet 40 which is held in the recess in such a manner as to be located between the support member 30 and the holder 32 in the direction of the rotation axis: and magnetic detection means which detects variation in magnetic flux of the magnet 40.SELECTED DRAWING: Figure 4A

Description

  The present disclosure relates to a rotation angle detection device.

  A rotation angle for detecting a rotation angle of a magnet by supporting a rotatable holder on a support member and holding a magnet in the holder and detecting a change in magnetic flux from the magnet as the magnet rotates with a magnetic detection sensor Detection devices are known.

JP, 2015-45557, A

  However, in the above-described rotation angle detection device, it is difficult to prevent the magnets in the holder from falling off with a simple configuration. For example, if a recess is provided in the holder and the magnet is pressed into and held in the recess, the press-fit state is released when vibration, impact or the like is applied, and the magnet in the holder may fall off.

  Therefore, in one aspect, the present invention aims to prevent the magnet in the holder from falling off with a simple configuration.

In one aspect, a support member having a pivot support.
The rotary shaft support portion has a driven portion rotatably supported around the rotary shaft and receiving a rotational drive force around the rotary shaft with a predetermined operation of the operating member, and in the direction of the rotary shaft A holder having a recess that is recessed;
A magnet held in the recess in a manner positioned between the support member and the holder in the direction of the axis of rotation;
There is provided a rotation angle detection device including magnetic detection means for detecting a change in magnetic flux of the magnet.

  In one aspect, according to the present invention, the magnets in the holder can be prevented from falling off with a simple configuration.

It is a top view which shows a shift device roughly. It is a perspective view showing a rotation angle detection device by one example. It is a disassembled perspective view of a rotation angle detection apparatus. It is a top view of a rotation angle detection device. It is a bottom view of a rotation angle detection device. It is sectional drawing along line VV of FIG. 4A. It is a perspective view from the upper side of a support member. It is a perspective view from the lower side of a support member. It is a perspective view from the upper side of a holder. It is a top view of a holder. It is a perspective view from the upper side of a magnet. It is a top view of a magnet.

  Hereinafter, each example will be described in detail with reference to the attached drawings.

  FIG. 1 is a top view schematically illustrating a shift device 10 in which a rotation angle detection device according to one embodiment may be incorporated. Three orthogonal axes X, Y, Z are defined in FIG. In the following description, the Z direction is referred to as the upper side, the positive side of the Z direction is referred to as “upper side”, the positive side of the Y direction is referred to as the right side, and the X direction is referred to as the front side. Let the side be "rear side".

  The shift device 10 is, for example, a shift-by-wire type shift device mounted on a vehicle or the like. The shift device 10 is a floor shift disposed at a center console (not shown) of a vehicle (not shown), but is not limited to this. For example, it is also possible to apply to an instrument panel shift disposed in the vicinity of an instrument panel (not shown).

  As shown in FIG. 1, the shift device 10 includes a case body 12 and a gate plate 18.

  The case body 12 is fixed in a recess of a center console (not shown). A part of the shift lever 14 is exposed to the outside of the case body 12. The shift lever 14 constitutes a part of a shift mechanism (not shown) housed inside the case body 12.

  The gate plate 18 is fixed to the upper surface side of the case body 12. The gate plate 18 is a rectangular plate that closes the opening of the case body 12, and a shift gate is formed to expose a part of the shift lever 14. The shift gate is, viewed in the vertical direction, a first long hole 20a extending linearly along the longitudinal direction of the vehicle, and a left side of the first long hole 20a and substantially parallel to the first long hole 20a. And the first elongated hole 20a and the second elongated hole 20b are extended along the left-right direction orthogonal to the first elongated hole 20b and the first elongated hole 20a and the second elongated hole 20b. And a third elongated hole 20c.

  The position A is disposed at the upper end of the first elongated hole 20a, and the position C is disposed at the lower end of the first elongated hole 20a. Further, a position B is disposed at a central portion of the first elongated hole 20a and at a connecting portion with the third elongated hole 20c. Further, the position D is disposed at the upper end of the second elongated hole 20b, and the position E is disposed at the lower end of the second elongated hole 20b.

  Incidentally, as shown in FIG. 1, the alphabetic characters “A”, “B”, “C”, “D” and “E” written on the upper surface of the gate plate 18 are respectively reverse position R and drive. It can be appropriately assigned to the position D, the neutral position N, and the like.

  The driver tilts the shift lever 14 rightward from the position D, for example, to the position B, and then further tilts upward (forward direction) to the position A, or continues further. The position C is obtained by tilting operation to the lower side (backward direction). In addition, the driver tilts to the lower side (rearward direction) from the position of the home position H to be the position E.

  After the driver tilts the shift lever 14 to set it to a predetermined shift position, the shift lever 14 is returned to the position D by the spring force of a return spring (not shown).

  Next, with reference to FIG. 2 and subsequent figures, a rotation angle detection device that can be incorporated into the above-described shift device 10 will be described.

  The rotation angle detection device is a device that detects the rotation angle of a member that rotates in accordance with the movement of the shift lever 14 described above.

  FIG. 2 is a perspective view showing a rotation angle detection device 3 according to one embodiment. FIG. 3 is an exploded perspective view of the rotation angle detection device 3. FIG. 4A is a top view of the rotation angle detection device 3, and FIG. 4B is a bottom view of the rotation angle detection device 3. In FIG. 4B, the substrate 42 and the shield plate 44 are not shown. FIG. 5 is a cross-sectional view along the line V-V of FIG. 4A. FIG. 6A is a perspective view from the upper side of the support member 30, and FIG. 6B is a perspective view from the lower side of the support member 30. FIG. FIG. 7A is a perspective view from the upper side of the holder 32, and FIG. 7B is a top view of the holder 32. FIG. 8A is a perspective view of the magnet 40 from the upper side, and FIG. 8B is a top view of the magnet 40.

  The rotation angle detection device 3 includes a slider 28, a support member 30, a holder 32, a magnet 40, and a magnetic detection sensor 41 (an example of a magnetic detection unit). In the present embodiment, as an example, two holders 32, two magnets 40, and two magnetic detection sensors 41 are provided to form each set. In the following, unless otherwise stated, the configuration of the holder 32, the magnet 40, and the magnetic detection sensor 41 according to one set will be representatively described.

  The slider 28 has a load transfer unit 281 connected to the shift lever 14. The load transfer unit 281 receives a force in the left-right direction (Y direction) according to the tilting of the shift lever 14 in the left-right direction.

  The slider 28 is slidably supported by the support member 30 as shown in FIGS. 3 and 4A. Specifically, the support member 30 has a slide groove 302 extending in the left-right direction, and in the slide groove 302, a slide pin (not shown, see slide pin position P1) which protrudes below the slider 28. ) Is inserted. As a result, the slider 28 can slide in the left and right direction along the slide groove 302. The slider 28 slides in the lateral direction with respect to the support member 30 when the load transfer unit 281 receives a force in the lateral direction.

  The slider 28 has engagement holes 282 on both sides in the front-rear direction (X direction) with respect to the slide pin position P1, as shown in FIG. 4A. In the present embodiment, as an example, the slider 28 is in the form of line symmetry with respect to a line segment in the Y direction passing through the slide pin position P1. The protrusion 321 of the holder 32 is inserted into the engagement hole 282. When the slider 28 slides in the left-right direction, the holder 321 is rotated by the movement of the protrusion 321 along the engagement hole 282. Thus, the slider 28 and the holder 32 realize a mechanism for converting the displacement of the slider 28 in the left-right direction into the rotation of the holder 32.

  The support member 30 is formed of, for example, a resin. The support member 30 is fixed to the shield plate 44. In the present embodiment, as an example, the support member 30 is fixed (co-fastened) together with the substrate 42 to the shield plate 44 with a bolt or the like.

  The support member 30 has a rotating shaft support portion 301 as shown in FIGS. 5 and 6A. The rotation shaft support portion 301 is provided for each set of the holder 32, the magnet 40, and the magnetic detection sensor 41. The rotating shaft support portion 301 forms a rotating shaft of the holder 32. The rotation axis of the holder 32 is parallel to the vertical direction (Z direction). That is, the direction of the rotation axis of the holder 32 is the vertical direction.

  The support member 30 has a flange portion 303 around the rotation shaft support portion 301 as shown in FIGS. 5 and 6A. The flange portion 303 extends around the rotary shaft support portion 301 in a direction away from the rotary shaft support portion 301 in the XY plane. In the present embodiment, as an example, the support member 30 has the cylindrical portion 304 extending in the vertical direction at two locations, and the flange portion 303 is formed in such a manner as to be connected from the inner wall of the cylindrical portion 304. A regulating portion 3041 for regulating the movement of the holder 32 in the vertical direction is formed on the inner wall of the cylindrical portion 304 at a position offset in the vertical direction in a predetermined range in the circumferential direction. In FIG. 6A, the flange portion 303 is formed to be continuous with the specific restricting portion 3041A.

  The holder 32 is a member for holding the magnet 40, and is formed of a nonmagnetic material. The holder 32 is positioned between the magnet 40 and the magnetic detection sensor 41 in the vertical direction as described later. Therefore, the holder 32 is formed of a nonmagnetic material so as not to affect the detection accuracy of the magnetic detection sensor 41.

  The holder 32 is rotatably supported by the rotation shaft support portion 301 around the rotation shaft. In the present embodiment, as one example, as shown in FIGS. 3, 5, 7A, and 7B, the holder 32 is provided with a rotation pin 322. The rotation pin 322 may be integrally formed as a part of the holder 32. The holder 32 is disposed in the cylindrical portion 304 of the support member 30. At this time, as shown in FIG. 5, the rotation pin 322 is inserted into the rotation shaft support portion 301 and becomes rotatable with respect to the rotation shaft support portion 301.

  The holder 32 has a projection 321 (an example of a driven part) as shown in FIGS. 3, 5, 7A and 7B.

  The protrusions 321 extend in the vertical direction. In the present embodiment, as an example, as shown in FIG. 7A, the protrusion 321 protrudes upward from the surface on which the engaging portion 324 (described later) is formed. The protrusion 321 extends upward into the engagement hole 282 through an opening (opening in the vertical direction) around the flange portion 303 in the cylindrical portion 304 of the support member 30. As described above, the protrusion 321 receives rotational driving force about the rotation axis via the slider 28 in accordance with tilting (an example of a predetermined operation) of the shift lever 14 (an example of the operation member) in the left-right direction. When the protrusion 321 receives rotational driving force around the rotation axis, the holder 32 rotates around the rotation axis.

  The holder 32 has a recess 323 which is recessed in the vertical direction. The recess 323 is open only at the upper side, as shown in FIGS. 5, 7A and 7B. A rotation pin 322 is provided at the center of the recess 323.

  As shown in FIGS. 3, 7A, and 7B, the holder 32 includes an engaging portion 324 at the outer periphery, which cooperates with the restricting portion 3041. The engaging portion 324 is located between the regulating portions 3041 offset in the vertical direction in the vertical direction. The holder 32 is restrained in the vertical direction with respect to the support member 30 by the engaging portion 324 abutting on the regulating portion 3041 in the vertical direction within the movable range (the movable range in the rotational direction). Therefore, the holder 32 can only rotate around the rotation axis with respect to the support member 30. The movable range of the holder 32 in the rotational direction (i.e., the rotational angle of the protrusion 321) is arbitrary, for example, about 150 degrees. An opening around the flange portion 303 (an opening through which the protrusion 321 passes) in the cylindrical portion 304 of the support member 30 is formed in a circumferential range corresponding to the rotation range of the protrusion 321.

  The magnet 40 is held in the recess 323 in a manner to be positioned between the support member 30 and the holder 32 in the vertical direction. The magnet 40 is press-fit into the recess 323, for example. Since only the upper side of the recess 323 opens as described above, the magnet 40 in the recess 323 is positioned between the support member 30 and the holder 32 in the vertical direction. Thus, even if the magnet 40 is detached from the recess 323 (even if the press-fit state is released), the magnet 40 can not be pulled out between the support member 30 and the holder 32 in the vertical direction. That is, the magnet 40 in the holder 32 can be prevented from falling off.

  In the present embodiment, as an example, the flange portion 303 of the support member 30 extends in a region overlapping with the magnet 40 as viewed in the vertical direction as shown in FIGS. 4A and 5. Therefore, the magnet 40 in the recess 323 is positioned between the flange portion 303 of the support member 30 and the holder 32 in the vertical direction. In this case, it is possible to prevent the magnet 40 in the holder 32 from falling off by using the flange portion 303 around the rotation shaft support portion 301.

  For example, as shown in FIG. 8A and FIG. 8B, the magnet 40 has a hole 401 through which the rotation pin 322 passes in the center, and a part of the outer shape is offset inward in the radial direction with respect to the rotation pin 322 It is in the form of a donut. That is, the magnet 40 is not completely circular in outer shape, but has a rectangular shape including a pair of long sides 420 and a pair of short sides 402. The long side 420 is offset closer to the rotation pin 322 than the short side 402. As a result, a space is created outside the long side 420 in the radial direction with respect to the rotation pin 322, and the upper surface of the magnet 40 and the lower surface of the protrusion 321 can be arranged on the same surface with good space efficiency. That is, the protrusion 321 can be disposed adjacent to the magnet 40 without enlarging the outer shape of the holder 32 when viewed in the vertical direction more than necessary.

  The magnetic detection sensor 41 detects a change in the magnetic flux of the magnet 40. The change in magnetic flux of the magnet 40 is caused by the rotation of the magnet 40 accompanying the rotation of the holder 32. Therefore, the magnetic detection sensor 41 can detect the rotation angle of the holder 32 by detecting the change of the magnetic flux of the magnet 40.

  In the present embodiment, as an example, as shown in FIGS. 3 and 4B, the magnetic detection sensor 41 is opposed to the magnet 40 via the holder 32 in the vertical direction. Specifically, the magnetic detection sensor 41 is mounted on the upper surface of the substrate 42 in a manner centered on the rotation pin 322 of the holder 32. In this manner, in the present embodiment, the substrate 42 on which the magnetic detection sensor 41 is mounted can be efficiently disposed in the space on the side (lower side) where the slider 28 and the like are not provided.

  By the way, as described above, in the rotation angle detection device which only press-fits and holds the magnet in the recess, when the rotation angle detection device is mounted on a movable body such as a vehicle, the holder when vibration or impact is applied. There is a risk that the inner magnet may fall off. That is, it is difficult to eliminate the possibility of the magnet coming off the holder only by the press fitting.

  In this respect, according to the present embodiment, as described above, the magnet 40 is held in the recess 323 in a mode in which the magnet 40 is positioned between the support member 30 and the holder 32 in the vertical direction. The magnet 40 in 32 can be prevented from falling off. That is, even when the magnet 40 is removed from the holder 32 (even when the pressed-in state is released), the magnet 40 is maintained in the state of being sandwiched between the support member 30 and the holder 32. As a result, the magnet 40 in the holder 32 is prevented from falling off. On the other hand, in the comparative example in which the magnet is held on the lower side of the holder, for example, the magnet press-fitted to the holder is easily detached unless a portion or a member for covering the magnet from the lower side is newly provided. For example, in the comparative example, in order to prevent the magnet 40 in the holder 32 from falling off, a protrusion may be provided in the recess of the holder to require heat crimping or the like.

  Thus, according to the present embodiment, the magnet 40 in the holder 32 can be prevented from falling off with a simple configuration that does not require heat caulking or the like.

  As mentioned above, although each Example was explained in full detail, it is not limited to a specific example, A various deformation | transformation and change are possible within the range described in the claim. In addition, it is also possible to combine all or a plurality of the components of the above-described embodiment.

  For example, in the embodiment described above, the rotation angle detection device 3 is mounted in a direction in which the rotation axis of the holder 32 is in the vertical direction, but the present invention is not limited thereto. For example, the rotation angle detection device 3 may be mounted such that the rotation axis of the holder 32 is in the front-rear direction or the left-right direction.

Reference Signs List 3 rotation angle detection device 10 shift device 12 case main body 14 shift lever 18 gate plate 20a first elongated hole 20b second elongated hole 20c third elongated hole 28 slider 30 support member 32 holder 40 magnet 41 magnetic detection sensor 42 substrate 44 shield Plate 281 Load transmitting portion 282 Engaging hole 301 Rotating shaft support portion 302 Slide groove 303 Flange portion 304 Cylindrical portion 321 Projection 322 Rotating pin 323 Recess 324 Engaging portion 3041 Regulating portion 3041 A Regulating portion

Claims (4)

A support member having a rotational shaft support;
The rotary shaft support portion has a driven portion rotatably supported around the rotary shaft and receiving a rotational drive force around the rotary shaft with a predetermined operation of the operating member, and in the direction of the rotary shaft A holder having a recess that is recessed;
A magnet held in the recess in a manner positioned between the support member and the holder in the direction of the axis of rotation;
And a magnetic detection means for detecting a change in magnetic flux of the magnet. The support member further includes a flange portion extending around the rotation shaft support portion,
The rotation angle detection device according to claim 1, wherein the flange portion extends in a region overlapping with the magnet as viewed in the direction of the rotation axis. The holder is formed of a nonmagnetic material.
The rotation angle detection device according to claim 1, wherein the magnetic detection unit faces the magnet via the holder in the direction of the rotation axis. The driven portion is a protrusion extending in the direction of the rotation axis,
The magnet is provided around the rotation axis, and when viewed in the direction of the rotation axis, a part of the outer shape is offset inward in the radial direction with respect to the rotation axis with respect to the protrusion. The rotation angle detection device according to any one of 3.