JP2010163093A - Rotary sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary sensor with improved mounting property. <P>SOLUTION: The rotary sensor 1 includes: a housing 2 of which the rotation with respect to a vehicle body B is prohibited by pinching a retained projection part B1 provided to the vehicle body B, and which houses a coil 31; a rotor 4 constituted of an electric conductor, fixed to a stand S, and rotating with respect to the housing 2 along with rotation of the stand S with respect to the vehicle body B; and a second pivot bolt 5 having a shaft part 51 inserted into a bearing hole formed to the housing 2 and screwed with a first pivot bolt PB in such a manner that its center axis is aligned with respect to the first pivot bolt PB, and a head part 52 connected to one end of the shaft part 51 and projected in a radial direction of the shaft part 51 to sandwich the housing 2 between the head part 52 and the vehicle body B. Since the housing 2 and the rotor 4 are attached together by the second pivot bolt 5, the mounting property is improved, compared with a case where the housing 2 and the rotor 4 are attached individually. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotary sensor.

  Conventionally, for example, as shown in FIG. 8, a rotary sensor 1 is provided that is attached to a connecting portion between a vehicle body B and a stand S in a two-wheeled vehicle to detect the standing state of the stand S (see, for example, Patent Document 1). . That is, by preventing the engine from starting when the stand S is in the standing state when the vehicle is stopped, the stand S is prevented from starting in the standing state.

  The example of FIG. 8 will be described in detail. The rotary sensor 1 includes a housing 2 connected to the vehicle body portion B, and is rotatably attached to the housing 2 and is connected to the stand S so that the stand S is connected to the vehicle body B. And a rotor (not shown) that rotates relative to the housing 2 in conjunction with the stand S when rotated as indicated by an arrow A1. The housing 2 is an electric wire electrically connected to a bottomed cylindrical main body portion 21 covering a rotor (not shown) and a detection portion (not shown) whose output changes as the rotor rotates relative to the housing 2. It has a wire lead-out portion 22 from which C is pulled out, and a pinching portion 23 that sandwiches the held convex portion B1 protruding from the vehicle body B with the wire lead-out portion 22. The housing 2 is prohibited from rotating with respect to the vehicle body B by sandwiching the held convex portion B <b> 1 between the wire lead-out portion 22 and the sandwiching portion 23. Thus, when the stand S rotates with respect to the vehicle body B, the rotor rotates with respect to the housing 2. The detection unit is configured to switch the output depending on whether or not the stand S is in the standing state. In the example of FIG. 8, the stand S is provided with a protrusion S1 protruding in the same direction as the held convex part B1 of the vehicle body B. The held convex part B1 provided on the vehicle body B and the protrusion S1 provided on the stand S are provided. Are connected via a connecting spring SP formed of a tension coil spring, and the stand S is maintained in one of a standing state when stopped and a retracted state when traveling by the spring force of the connecting spring SP.

  The detection unit includes, for example, a fixed contact provided on the housing 2 and a movable contact provided on the rotor and switched to and away from the fixed contact according to the orientation of the stand S (standing state or retracted state). It is conceivable to use a rotary switch. However, when the rotary switch as described above is used as the detection unit, the space surrounding the space is sealed in order to seal the space in which the fixed contact and the movable contact are accommodated by closing the gap between the housing 2 and the rotor. A shaped oil seal (not shown) must be interposed between the housing 2 and the rotor, and such oil seals wear as the housing 2 rotates relative to the rotor. When the oil seal is worn, foreign matter such as dust entering from the outside due to the deterioration of the sealing property, or wear powder of the oil seal itself may enter between the fixed contact and the movable contact and cause contact failure. There is. Further, wear occurs on the fixed contact and the movable contact. In addition, when the oil seal is worn and water enters the space, a short circuit may occur. As described above, when the rotary switch as described above is used as the detection unit, the life of the rotary sensor 1 until the contact failure or short circuit between the fixed contact and the movable contact occurs is shortened.

  Therefore, for example, as shown in FIGS. 9 and 10, the coil 31 and a detection circuit (not shown) for detecting the orientation of the stand S (standing state or retracted state) based on the inductance change of the coil 31 and the coil 31. In addition, a rotary sensor 1 is proposed in which a detection unit 3 having a printed wiring board 30 on which a detection circuit is mounted is housed and held in a housing 2 and the rotor 4 is made of metal.

  9 and 10 will be described in detail. The housing 2 includes a body 2a having a housing recess 20 in which the detection unit 3 is housed and screwed to the vehicle body B by a bolt BO, and a body 2a. It consists of a cover 2b that is fixed and seals the storage recess 20a. The rotor 4 is fixed to the stand S by inserting a first pivot bolt PB that also serves as a rotation shaft of the stand S with respect to the vehicle body B. Here, the rotor 4 overlaps with the coil when viewed from the rotation axis direction of the stand S (upper side in FIG. 9) when the stand S is one of the standing state and the retracted state, and the stand S is in the standing state and the retracted state. When viewed from the direction of the rotation axis of the stand S, the coil does not overlap the coil. That is, the inductance of the coil 31 including the influence of the rotor 4 differs depending on whether the stand S is in the standing state or the retracted state, and the detection circuit is based on the change in the inductance of the coil 31 with the rotation of the rotor 4 with respect to the housing 2. It is determined whether or not the stand S is standing. According to the above configuration, the coil 31 and the rotor 4 do not need to be in contact with each other, and components to be arranged in the same space, such as a movable contact and a fixed contact in the rotary switch, are disposed between the housing 2 and the rotor 4. Since it does not exist, an oil seal for sealing the space as described above is not necessary, so that it is possible to extend the life by not causing contact wear and oil seal wear as in the case of using a rotary switch. . Further, since the oil seal is not necessary, the number of parts is reduced, and the manufacturing cost can be reduced.

JP 2004-231094 A

  However, in the example of FIGS. 9 and 10, the rotor 2 is attached such that after the housing 2 is screwed to the vehicle body B, the stand S is once removed and the rotor 4 is reattached together with the stand S by the first pivot bolt PB. 4 and the mounting work of the housing 2 need to be performed separately, and the mounting property was low.

  The present invention has been made in view of the above reasons, and an object of the present invention is to provide a rotary sensor with improved mountability.

  According to the first aspect of the present invention, there is provided a stand that is rotatably attached to the vehicle body by inserting a first pivot bolt that is screwed into the vehicle body, and a cover that protrudes from the vehicle body in a direction parallel to the rotation axis of the stand. A rotary sensor attached to a two-wheeled vehicle having a holding projection and used for detecting the orientation of the stand relative to the body of the two-wheeled vehicle, comprising: a coil; a detection circuit for detecting the orientation of the stand based on the inductance of the coil; A housing that houses each of the detection circuits, a rotor that is made of a conductive material and is fixed to the stand and rotates with respect to the housing as the stand rotates relative to the vehicle body, and is inserted into a bearing hole provided in the housing and A shaft portion that is screwed with the central axis aligned with the first pivot bolt, and is connected to one end of the shaft portion and projects in the radial direction of the shaft portion. A second pivot bolt having a head portion sandwiching the housing between the housing and the vehicle body. The housing has a sandwiching portion sandwiching the held convex portion, and the sandwiching portion sandwiches the held convex portion to rotate relative to the vehicle body. The rotor is prohibited, and the main body portion in which the bolt insertion hole through which the shaft portion of the second pivot bolt is inserted penetrates and the displacement in the direction away from the stand is prohibited by being sandwiched between the housing and the stand. And a rotation prohibiting portion that protrudes from the main body and contacts the stand from a direction orthogonal to the rotation axis of the stand with respect to the vehicle body and prohibits rotation of the rotor relative to the stand.

  According to the present invention, since the attachment of the rotor and the attachment of the housing are performed collectively by the second pivot bolt, the attachment performance is improved as compared with the case where the attachment of the rotor and the attachment of the housing are separately performed.

  According to a second aspect of the present invention, in the first aspect of the invention, the surface of the housing facing the head of the second pivot bolt is provided with an annular recess surrounding the shaft portion of the second pivot bolt, and has elasticity. And an O-ring that is accommodated in the annular recess and elastically contacts the head of the second pivot bolt and the housing.

  According to the present invention, since the housing is pressed against the rotor by the elastic force of the O-ring, rattling of the housing with respect to the rotor can be suppressed.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the housing includes a cylindrical enclosure that covers the main body of the rotor when viewed from a direction orthogonal to the axial direction of the shaft portion of the second pivot bolt. It is characterized by having.

  According to this invention, the entrance of foreign matter between the housing and the rotor can be prevented by the surrounding portion.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the rotor includes a sandwiching portion as a rotation prohibiting portion sandwiching the stand, and a projecting portion protruding from the main body so that the sandwiching portion sandwiches the stand It has a positioning part which contacts a stand from the direction to do.

  According to the present invention, when the rotor is mounted in the reverse direction rotated by 180 ° around the rotation axis of the stand with respect to the correct direction, the positioning unit becomes an obstacle, so that the rotor is as described above with respect to the stand. It can prevent being attached in the reverse direction.

  The invention of claim 5 is a rotary sensor attached to a two-wheeled vehicle having a stand made of a conductive material and rotatably attached to the vehicle body, and used for detecting the orientation of the stand relative to the vehicle body of the two-wheeled vehicle. And a detection circuit that detects the orientation of the stand based on the inductance of the coil, and a housing that houses the coil and the detection circuit and is fixed to the vehicle body.

  According to the present invention, the housing may be fixed at a position where the distance between the coil and the stand changes with the change in the orientation of the stand, and the inductance of the coil is changed in conjunction with the stand made of the conductive material. Therefore, as compared with the case where a rotor is separately provided, the mounting property is improved and the manufacturing cost is reduced.

  According to the first aspect of the present invention, the shaft portion is inserted into a bearing hole provided in the housing and screwed with the central axis aligned with the first pivot bolt and one end of the shaft portion. A second pivot bolt having a head projecting radially and having a housing sandwiched between the housing and the vehicle body is provided. The housing has a sandwiching portion sandwiching the held convex portion, and the sandwiching portion sandwiches the retained convex portion, thereby providing the vehicle body. The rotor is prohibited from rotating, and the rotor is prohibited from being displaced in a direction away from the stand by being provided with a bolt insertion hole through which the shaft portion of the second pivot bolt is inserted and being sandwiched between the housing and the stand. And a rotation prohibiting portion that protrudes from the main body and is in contact with the stand from a direction perpendicular to the rotation axis of the stand with respect to the vehicle body and prohibits rotation of the rotor with respect to the stand. Since the mounting and the attachment of the housing is performed collectively by a second pivot bolt, the attachment is improved as compared with the case where the attachment of the rotor attachment and the housing separately.

  According to the second aspect of the present invention, the surface of the housing facing the head of the second pivot bolt is provided with an annular recess surrounding the shaft portion of the second pivot bolt, and is made of an elastic material and has an annular shape. Since the O-ring is housed in the annular recess and elastically contacts the head of the second pivot bolt and the housing, the housing is pressed against the rotor by the elastic force of the O-ring. It can be suppressed.

  According to the invention of claim 3, since the housing has the cylindrical enclosing portion that covers the main body portion of the rotor as viewed from the direction orthogonal to the axial direction of the shaft portion of the second pivot bolt, the housing is provided between the housing and the rotor. The entry of foreign matter into the wall can be prevented by the surrounding portion.

  According to the invention of claim 4, the rotor includes a pinching portion as a rotation prohibiting portion that sandwiches the stand, and a positioning portion that protrudes from the main body portion and that abuts on the stand from a direction perpendicular to the direction in which the pinching portion sandwiches the stand. Therefore, when trying to mount the rotor in the reverse direction rotated 180 ° around the rotation axis of the stand with respect to the correct orientation, the positioning part becomes an obstacle, so the rotor is in the reverse direction as described above with respect to the stand. Can be prevented from being attached to.

  According to the invention of claim 5, a rotary sensor that is attached to a two-wheeled vehicle having a stand made of a conductive material and rotatably attached to the vehicle body, and is used for detecting the orientation of the stand relative to the vehicle body of the two-wheel vehicle, A coil, a detection circuit that detects the orientation of the stand based on the inductance of the coil, and a housing that houses the coil and the detection circuit and is fixed to the vehicle body are provided. It is only necessary to fix the housing at a position where the distance between the stand and the stand changes, and a rotor that is made of a conductive material and is displaced so as to fluctuate the coil inductance in conjunction with the stand is not required. Compared to the case, the mounting property is improved and the manufacturing cost is reduced.

It is a disassembled perspective view which shows the principal part of embodiment of this invention and a two-wheeled vehicle. It is sectional drawing which shows the principal part of the state attached to the two-wheeled vehicle same as the above. It is a perspective view which shows the principal part of the state which attached the rotor same as the above to the stand. It is a perspective view which shows the principal part of the state which attached the rotor of the comparative example same as the above to the stand. It is sectional drawing which shows the principal part of the state which decomposed | disassembled the same. It is a perspective view which shows the state which decomposed | disassembled the same as the above. It is a perspective view which shows the principal part of the example of a stand where a rotor becomes unnecessary. It is explanatory drawing which shows the example of the usage condition of a rotary sensor. It is a perspective view which shows a prior art example. It is a disassembled perspective view which shows the same as the above.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  As shown in FIGS. 1 and 2, the rotary sensor 1 according to the present embodiment has a first pivot bolt PB threadedly engaged with a vehicle body B (specifically, for example, a bracket), thereby being inserted into the vehicle body B. The two-wheeled vehicle is attached to a two-wheeled vehicle having a stand S rotatably attached around the axis of one pivot bolt PB and a held convex portion B1 projecting from the vehicle body B in a direction parallel to the rotational axis of the stand S. This is used to detect the orientation of the stand S relative to the vehicle body B.

  Specifically, in the present embodiment, the housing 2 that houses the detection unit 3 in which the coil 31 and the detection circuit 32 that detects the orientation of the stand based on the inductance of the coil 31 are mounted on the printed wiring board 30. And a rotor 4 that is made of a conductor and is fixed to the stand S and rotates with respect to the housing 2 as the stand S rotates with respect to the vehicle body B, and a bearing hole 24 provided in the housing 2 and the first. A shaft portion 51 that is screwed with the central axis aligned with the pivot bolt PB and a head portion 52 that is connected to one end of the shaft portion 51 and projects in the radial direction of the shaft portion 51 and sandwiches the housing 2 between the vehicle body B and the like. 2 pivot bolts 5. Hereinafter, the horizontal direction will be described with reference to FIG. That is, the direction in which the present embodiment is attached to the vehicle body B and the stand S of the two-wheeled vehicle and the protruding direction of the held projection B1 from the vehicle body B (upper right direction in FIG. 1) is referred to as the left direction.

  The printed wiring board 30 has a flat annular shape surrounding the second pivot bolt 5 and is fixed in the housing 2 with the thickness direction directed in the left-right direction. The detection circuit 32 is configured by a one-chip integrated circuit, and is mounted on the right surface of the printed wiring board 30 together with the coil 31. The detection circuit 32 detects the orientation of the stand S based on the inductance of the coil 31 and generates an output corresponding to the detection result, as in the conventional detection circuit of FIGS. 9 and 10. Since such a detection circuit 32 can be realized by a known technique, detailed illustration and description thereof are omitted.

  The housing 2 is made of an insulating material, and a body 2a in which an annular storage recess 20 in which the detection unit 3 is fixed is opened on the right side, and a flat annular shape made of an insulating material, with a thickness direction in the horizontal direction. The cover 2b is fixed to the body 2a so as to seal the housing recess 20 toward the head. As a material for the body 2a and the cover 2b, for example, a synthetic resin can be used. As a means for fixing the detection unit 3 in the housing recess 20, for example, heat welding of the printed wiring board 30 to the body 2a can be used. As means for fixing 2b to the body 2a, for example, laser welding can be used. From the bottom surface of the housing recess 20, a cylindrical projection that surrounds the shaft portion 51 of the second pivot bolt 5, the outer peripheral surface forms the inner surface of the storage recess 20, and the inner peripheral surface forms the inner surface of the bearing hole 24. 20a protrudes to the right, and the outer peripheral surface of the cylindrical convex portion 20a and the inner peripheral surface of the storage concave portion 20 respectively have a step 20b that contacts the left surface of the printed wiring board 30 of the detection unit 3, A step 20c that abuts against the left surface of the cover 2b is provided. The right end surface of the cylindrical convex portion 20a protrudes to the right from the right surface of the cover 2b so as to be in sliding contact with the rotor 4, and in order to reduce friction between the housing 2 and the rotor 4 when attached to the vehicle body B. Grease is applied to the right end surface of the convex portion 20a.

  Further, the body 2a of the housing 2 has a cylindrical shape as a whole, and in addition to the main body portion 21 provided with the storage recess 20, as in the conventional example, the body 2a protrudes radially from the outer peripheral surface of the main body portion 21 and is held. It has the electric wire drawer | drawing-out part 22 and the clamping part 23 as a clamping part which pinches | interposes convex part B1. The output of the detection circuit 32 is output to the outside via an electric wire (not shown) drawn from the electric wire drawing portion 22. On the left surface (the upper right surface in FIG. 1) of the wire lead-out portion 22 and the pinching portion 23, pinching convex portions 22a and 23a that protrude leftward and face each other with the held convex portion B1 interposed therebetween are provided. The housing 2 is prohibited from rotating with respect to the vehicle body B by sandwiching the held convex portion B <b> 1 between the wire lead-out portion 22 and the sandwiching portion 23.

  The rotor 4 is formed by punching and drawing a metal plate, for example, and has a flat shape with the thickness direction directed in the left-right direction, and a circular shape into which the shaft portion 51 of the second pivot bolt 5 is inserted. A bolt insertion hole 41a has a main body portion 41 penetrating left and right. That is, the rotor 4 is sandwiched between the right end surface of the cylindrical convex portion 20a of the body 2a of the housing 2 and the stand S, so that displacement in the left-right direction with respect to the stand S is prohibited. Here, the second pivot bolt 5 is a so-called stepped bolt, and the shaft portion 51 of the second pivot bolt 5 has a threaded portion 51a that is threaded on the outer peripheral surface and is screwed to the first pivot bolt PB. A cylindrical shape coupled to the left side of the threaded portion 51a and having a central axis that coincides with the central axis of the threaded portion 51a and has an outer diameter that is larger than the threaded portion 51a and slightly smaller than the inner diameter of the bearing hole 24. The shaft portion 51 b is located in the hole 24. The inner diameter of the bolt insertion hole 41a of the rotor 4 is larger than the outer diameter of the threaded portion 51a and smaller than the outer diameter of the shaft portion 51b, and the rotor 4 has a body portion 41 between the shaft portion 51b and the stand S. It is fixed to the stand S by being sandwiched between them. In addition, the main body 41 has a shape in which a quarter arc-shaped detected portion 41b concentric with the bolt insertion hole 41a and one string of the detected portion 41b is extended to the opposite side across the bolt insertion hole 41a. And arm portion 41c. The detected portion 41b is located on the right side of the coil 31 only when the stand S is in one of the standing state and the retracted state, and the rotor 4 is located on the right side of the coil 31 when the stand S is in the other state. Is not located. That is, when the rotor 4 rotates with respect to the housing 2 as the stand S rotates with respect to the vehicle body B, the inductance of the coil 31 changes mainly due to the distance between the detected portion 41b and the coil 31 changing.

  Furthermore, the rotor 4 is provided with a first sandwiching protrusion 42 projecting rightward from the tip of the arm 41c and a first sandwiching one end of the stand S projecting rightward from the outer peripheral edge of the detected portion 41b. An arc-shaped second sandwiching convex portion 43 sandwiched between the convex portions 42 is provided. That is, the first pinching convex portion 42 and the second pinching convex portion 43 as the pinching portion sandwich one end portion of the stand S, so that the rotor 4 is prohibited from rotating with respect to the stand S. When rotating with respect to S, the rotor 4 rotates relative to the vehicle body B and the housing 2 in conjunction with the stand S. Further, the second pinching convex portion 43 has a portion on the right side (lower side in FIG. 3) of the one string of the detected portion 41b in the extending direction of the stand S (upper right direction in FIG. 3) together with the first pinching convex portion 42. While sandwiching the stand S from the orthogonal direction (upper left-lower right direction in FIG. 3), the portion on the right side (lower side in FIG. 3) of the other string of the detected portion 41b is opposite to the extending direction of the stand S (FIG. 3) (the lower left direction in FIG. 3) abuts on the stand S. When the rotor 4 is attached to the stand S, as described above, the first sandwiching projection 41b and the second sandwiching projection 41c of the rotor 4 are in contact with the stand S from three different directions by 90 degrees, so that the stand S The rotor 4 is positioned with respect to. That is, the second pinching convex portion 43 is a pinching portion in the claims and a positioning portion in the claims. Here, when the second sandwiching projection 43 does not contact the stand S from the direction opposite to the extension direction of the stand S as shown in FIG. There is a possibility that one pivot bolt PB is erroneously attached in the reverse direction rotated by 180 ° around the central axis of the pivot bolt PB (that is, the rotation axis of the stand S relative to the vehicle body B). On the other hand, in the present embodiment, when the rotor 4 is attached to the stand S in the reverse direction rotated 180 ° around the central axis of the first pivot bolt PB from the correct orientation as shown in FIG. The second pinching convex portion 43 cannot be attached to the stand S, and the second pinching convex portion 43 prevents the reverse mounting as described above, and the positioning as shown in FIG. The mountability is improved compared to the example.

  Here, as shown in FIG. 5 and FIG. 6, an annular ring opened to the inner side and the left side of the bearing hole 24 is formed on the left surface which is the surface directed to the head portion 52 of the second pivot bolt 5 in the body 2 a. A shaped annular recess 25 is provided. The annular recess 25 accommodates an O-ring 6 made of an elastic material such as synthetic rubber. The thickness dimension (the dimension in the left-right direction in FIG. 5) of the O-ring 6 that is not elastically deformed is larger than the depth dimension of the annular recess 25, and the O-ring is in a state where the second pivot bolt 5 is tightened. 6 is in a state of being elastically deformed so as to be crushed between the head 52 of the second pivot bolt 5 and the bottom surface of the annular recess 25. That is, when the housing 2 is pressed against the rotor 4 by the elastic force of the O-ring 6, rattling of the housing 2 with respect to the rotor 4 (and erroneous detection associated therewith) is suppressed.

  Further, the body 2a has a cylindrical enclosing portion 26 that extends rightward from the portion constituting the inner peripheral surface of the housing recess 20 and protrudes to the right from the right end of the cylindrical projecting portion 20a to surround the cover 2b. When the second pivot bolt 5 is tightened, the surrounding portion 26 protrudes rightward from the main body portion 41 of the rotor 4 and from a direction orthogonal to the axial direction (left-right direction) of the shaft portion 51 of the second pivot bolt 5. The main body 41 of the rotor 4 is covered as seen. That is, entry of foreign matter such as mud between the housing 2 and the rotor 4 is prevented by the surrounding portion 26.

  Further, a circular recess 27 in which the head 52 of the second pivot bolt 5 is accommodated is provided on the left surface of the body 2a, and the annular recess 25 and the bearing hole 24 open to the bottom surface of the recess 27, respectively. ing.

  According to the above configuration, since the attachment of the rotor 4 and the attachment of the housing 2 are performed together by the second pivot bolt 5, the attachment of the rotor 4 and the attachment of the housing 2 are performed as in the conventional examples of FIGS. As compared with the case where the process is performed separately, the mounting property is improved.

  Further, unlike the conventional examples of FIGS. 9 and 10, since it is not necessary to secure an area for fixing the housing 2 on the vehicle body B, the vehicle body B is suitable for attachment to a two-wheeled vehicle having a held convex portion B1.

  Note that, when the stand S is made of a conductive material such as metal, as shown in FIG. 7, the distance from the coil 31 when the stand S rotates between the standing state and the retracted state with respect to the vehicle body B. In the case where the detected part S2 is provided on the stand S so as to change, the rotor 4 becomes unnecessary.

DESCRIPTION OF SYMBOLS 1 Rotary sensor 2 Housing 4 Rotor 5 2nd pivot bolt 6 O-ring 24 Bearing hole 25 Annular recessed part 26 Enclosing part 31 Coil 32 Detection circuit 41 Main body part 42 First pinching convex part (Rotation prohibition part, pinching part in Claim)
43 2nd pinching convex part (rotation prohibition part, pinching part, positioning part in claims)
51 Shaft 52 Head B Body B1 Held Convex PB First Pivot Bolt S Stand

Claims (5)

A motorcycle having a stand rotatably attached to a vehicle body by inserting a first pivot bolt screwed into the vehicle body and a held convex portion projecting from the vehicle body in a direction parallel to the rotation axis of the stand. A rotary sensor attached and used for detecting the orientation of the stand relative to the body of the motorcycle,
A coil, a detection circuit that detects the orientation of the stand based on the inductance of the coil, a housing that houses the coil and the detection circuit, and a housing that is made of a conductive material and that is fixed to the stand and rotates with respect to the vehicle body. A rotor that rotates relative to the shaft, a shaft that is inserted into a bearing hole provided in the housing and that is screwed with the central axis aligned with the first pivot bolt, and one end of the shaft that is connected to the shaft. A second pivot bolt having a head projecting in the direction and sandwiching the housing between the body and the vehicle body;
The housing has a sandwiching part that sandwiches the held convex part, and the sandwiching part sandwiches the held convex part to prohibit rotation with respect to the vehicle body,
The rotor has a main body portion in which a bolt insertion hole through which the shaft portion of the second pivot bolt is inserted is inserted and the displacement in the direction away from the stand is prohibited by being sandwiched between the housing and the stand, and the main body A rotary sensor, comprising: a rotation prohibiting portion protruding from the portion and contacting the stand from a direction perpendicular to the rotation axis of the stand relative to the vehicle body and prohibiting rotation of the rotor relative to the stand. An annular recess surrounding the shaft portion of the second pivot bolt is provided on the surface of the housing facing the head of the second pivot bolt,
2. The rotary sensor according to claim 1, further comprising an O-ring which is made of an elastic material and has an annular shape and is housed in the annular recess and elastically contacts the head of the second pivot bolt and the housing.   3. The rotary sensor according to claim 1, wherein the housing has a cylindrical surrounding portion that covers the main body portion of the rotor as viewed from a direction orthogonal to the axial direction of the shaft portion of the second pivot bolt.   The rotor includes a pinching portion as a rotation prohibiting portion that sandwiches the stand, and a positioning portion that protrudes from the main body portion and abuts the stand from a direction orthogonal to the direction in which the pinching portion sandwiches the stand. The rotary sensor of any one of 1-3. A rotary sensor attached to a two-wheeled vehicle having a stand made of a conductive material and rotatably attached to the vehicle body, and used to detect the orientation of the stand relative to the vehicle body of the two-wheeled vehicle,
A rotary sensor comprising: a coil; a detection circuit that detects the orientation of the stand based on the inductance of the coil; and a housing that houses the coil and the detection circuit and is fixed to the vehicle body.

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