JP5222199B2 - Rotary sensor - Google Patents

Description

  The present invention relates to a rotary sensor.

  Conventionally, for example, as shown in FIG. 3, 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 and detects 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. 3 will be described in detail. The rotary sensor 1 is connected to the vehicle body B, the housing 2 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. 3, the stand S is provided with a protrusion S1 protruding in the same direction as the held convex portion B1 of the vehicle body B, and the held convex portion B1 provided on the vehicle body B and the protrusion S1 provided on the stand S. 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.

  Examples of this type of rotary sensor 1 include those shown in FIGS. The rotary sensor 1 includes a housing 2 and a rotor 3 that is rotatably supported with respect to the housing 2. The housing 2 holds a fixed contact 41, and the rotor 3 is provided with a movable contact 33 a that comes into contact with the fixed contact 41 when the rotor 3 rotates with respect to the housing 2. That is, the fixed contact 41 and the movable contact 33a constitute the detection unit. Hereinafter, the upper and lower sides will be described with reference to FIG.

  The housing 2 includes a bottomed cylindrical main body 21 in which a housing recess 20 in which a part of the rotor 3 is accommodated is opened on the lower surface, and a wire lead-out portion 22 and a sandwiching portion 23 similar to those in the example of FIG. On the upper surfaces of the wire lead-out portion 22 and the pinching portion 23, pinching convex portions 22a and 23a that protrude upward and face each other are provided.

  The inner bottom surface of the housing recess 20 is made of a metal plate whose thickness direction is directed vertically, and has an arc shape centered on the rotation axis of the rotor 3 with respect to the housing 2 and has an inner diameter and an outer diameter that are common to each other. The fixed contact 41 and a to-be-connected portion made of a metal plate whose thickness direction is directed in the vertical direction and having an annular shape centering on the rotation axis of the rotor 3 with respect to the housing 2 and having an outer diameter smaller than the inner diameter of the fixed contact 41 Terminal 51 is held. The electric wire C drawn out from the electric wire drawing portion 22 provided in the housing 2 has a plurality of core wires (not shown) corresponding to each fixed contact 41 and the connected terminal 51 in a one-to-one manner. The wire is electrically connected to the corresponding one of the fixed contacts 41 and the connected terminal 51.

  The rotor 3 is stamped and bent on a metal plate, and has a movable contact 33 holding a movable contact 33a. The rotor 3 is connected to the movable contact 33a via the movable contact 33 and is stored in the storage recess 20. An inner rotor 31 and an outer rotor 32 that is mechanically coupled to the inner rotor 31 and is disposed across the inside and outside of the housing recess 20 are provided. Each of the inner rotor 31 and the outer rotor 32 is made of a synthetic resin such as polybutylene terephthalate (PBT).

  As shown in FIG. 3, the inner rotor 31 has a circular ring-shaped main body portion 31 a that is flat as a whole, and a cylindrical shape that allows communication between the upper and lower sides of the main body portion 31 a, and extends from the center of the main body portion 31 a to both the upper and lower sides. It has a protruding shaft part 31b and a cylindrical coupling part 31c protruding from the lower surface of the main body part 31a.

  The movable contact 33 is arranged on the upper side of the main body 31a so as to surround the shaft 31b of the inner rotor 31 with the thickness direction directed in the vertical direction. Two interlocking protrusions 33d are provided on the movable contact 33 so as to protrude downward by bending each other in an arrangement opposite to each other across the center, and are located on the opposite sides of the center portion 31a of the inner rotor 31 with respect to the center. Interlocking holes 31d are vertically penetrated at two locations, and the interlocking protrusions 33d are inserted into the interlocking holes 31d, so that the movable contact 33 rotates in conjunction with the inner rotor 31. Between the lower surface of the movable contact 33 and the main body 31a of the inner rotor 31, three contact pressure springs 34 each formed of a coil spring are provided with a position shifted by about 120 ° when viewed from below. The lower end portion of the pressure spring 34 is housed in a spring receiving recess 31e provided on the upper surface of the main body portion 31a of the inner rotor 31, and the upper end of the contact pressure spring 34 is brought into elastic contact with the lower surface of the movable contact member 33. 31 is biased upward. A movable contact 33a is provided at one of the three positions on the upper surface of the movable contact 33 on the upper side of the contact pressure spring, and two connection terminals 33b that elastically contact the connected terminal 51 are provided at the remaining two positions. It has been. That is, among the fixed contacts 41, the contact of the movable contact is electrically connected to the connected terminal 51 via the movable contact 33. The contact pressure of the movable contact 33a with respect to the fixed contact 41 and the contact pressure of the connection terminal 33b with respect to the connected terminal 51 are ensured by the spring force of the contact pressure spring 34, respectively.

  The outer rotor 32 includes a bottomed cylindrical main body portion 32a having an open bottom surface, a flange portion 32b protruding outward from the lower end of the main body portion 32a, and protruding downward from the periphery of the flange portion 32b. And a U-shaped connecting portion 32c.

  The outer rotor 32 is joined to the inner rotor 31 by welding with, for example, ultrasonic waves or lasers, with the main body portion 32a being inserted into the coupling portion 31c of the inner rotor 31. In addition, a sleeve 35 having a cylindrical shape whose axial direction is directed in the vertical direction and communicating with the upper and lower sides of the outer rotor 32 is held by the body portion 32a of the outer rotor 32 by, for example, insert molding. The sleeve 35 projects upward from the outer rotor 32 and covers the inner peripheral surface of the shaft portion 31 b of the inner rotor 31, and the lower end surface of the sleeve 35 is substantially flush with the inner bottom surface of the main body portion 32 a of the outer rotor 32. ing. Here, on the outer peripheral surface of the main body portion 32 a of the outer rotor 32, for example, four engagement convex portions 32 d are provided to protrude outward in a position shifted by about 90 degrees, and the inner portion of the coupling portion 31 c of the inner rotor 31 is provided. Four engaging recesses (not shown) are provided on the peripheral surface so as to be displaced by about 90 degrees. When the engaging protrusions 32d are engaged with the engaging recesses, The inner rotor 31 is not allowed to rotate in the plane as viewed from above and below. In addition, one of the engaging convex portion 32d and the engaging concave portion has a larger width dimension than the other, and if not a certain combination, the engaging convex portion 32d is engaged with the engaging concave portion. I can't. This prevents the inner rotor 31 from being attached to the outer rotor 32 in the wrong direction.

  When attached to the vehicle body B, both ends of the connecting portion 32c of the outer rotor 32 sandwich one end pivotally attached to the vehicle body B in the stand S, and the other end of the stand S (the end on the side in contact with the ground) is It is located on the right side in FIG. When the stand S rotates with respect to the vehicle body B, the inner surface of the connecting portion 32c of the outer rotor 32 contacts the stand S, so that the rotor 3 rotates relative to the housing 2 in conjunction with the stand S. The separation (contact state) between the movable contact 33a and each fixed contact 41 is switched.

  Further, in the storage recess 20, rainwater intrusion through the gap between the rotor 3 and the housing 2 is an annular shape between the lower surface of the main body portion 31 a of the inner rotor 31 and the upper surface of the flange portion 32 b of the outer rotor 32. A first oil seal 61 is disposed to prevent the lubricant such as grease from flowing out. Further, an annular slide made of metal is provided between the main body 31 a of the inner rotor 31 and the first oil seal 61 in order to reduce friction between the inner rotor 31 and the first oil seal 61. A plate 63 is arranged.

  Further, a circular insertion hole 20 a is vertically penetrated at the center of the bottom surface of the storage recess 20. On the upper surface of the housing 2, an annular surrounding projection 21 a surrounding the insertion hole 20 a is projected upward. The inner diameter of the insertion hole 20 a is larger than the outer diameter of the shaft portion 31 b of the inner rotor 31, and the rotor 3 is pivotally supported with respect to the housing 2 by inserting the shaft portion 31 b of the inner rotor 31 into the insertion hole 20 a.

  An attachment bolt 7 (see FIG. 1) for attaching the rotary sensor 1 to the stand S is inserted into the sleeve 35 of the rotor 3. The mounting bolt 7 has a leg portion 71 having a cylindrical shape and provided with a thread on the outer peripheral surface, and the leg portion with respect to a pivot bolt BO (see FIG. 1) for screwing the stand S to the vehicle body B. 71 is mechanically coupled to the stand S by screwing with the central axis aligned. Further, the mounting bolt 7 has a dimension and shape that cannot be inserted into the insertion hole 20a of the housing 2, and is connected to one end of the leg portion 71 and is surrounded by the surrounding projection 21a of the housing 2 (see FIG. 1). The flange portion 72 prevents the rotary sensor 1 from falling off the vehicle body B and the stand S.

  Further, a ring shape between the inner peripheral surface of the insertion hole 20a and the shaft portion 31b of the inner rotor 31 prevents rainwater from entering through the gap between the rotor 3 and the housing 2 and preventing the lubricant from flowing out. Two oil seals 62 are arranged. One end of the second oil seal 62 in the axial direction and at the outer end is provided with a flange portion 62a protruding outward in the radial direction. On the outer peripheral surface of the flange portion 62a, a positioning convex portion 62b is projected outward in the radial direction. A positioning concave portion 21c is provided on the upper surface of the housing 2, and the positioning convex portion 62b is formed on the positioning concave portion 21c. By engaging, the rotation of the second oil seal 62 with respect to the housing 2 in the plane viewed from the vertical direction is prohibited. The surrounding projection 21a is provided with a notch 21d communicating with the positioning recess 21c. The flange portion 62 a of the second oil seal 62 is sandwiched between the lower surface of the flange portion 72 of the mounting bolt 7 inserted through the sleeve 35 and the upper surface of the housing 2.

  Further, on the inner bottom surface of the storage recess 20, a cylindrical tube protrusion 21 b surrounding the insertion hole 20 a is projected downward. The connected terminal 51 and each fixed contact 41 are respectively held in the housing 2 by insert molding. The connected terminal 51 has an inner peripheral edge that enters the cylindrical protrusion 21b, and each fixed contact 41 has an end portion on the outside in the radial direction. Enters the inner peripheral surface of the storage recess 20.

JP 2004-231094 A

  When the fixed contact 41 and the movable contact 33a are used as the detection unit as described above, the contact failure or short circuit between the fixed contact 41 and the movable contact 33a occurs due to wear of the fixed contact 41 and the movable contact 33a. The life of the rotary sensor 1 until this is shortened.

  This invention is made | formed in view of the said reason, The objective is to provide the rotary sensor which can extend a lifetime.

The invention of claim 1 is a rotary sensor used for detecting the orientation of the stand with respect to the vehicle body of the two-wheeled vehicle, the housing being connected to the vehicle body, and attached to the housing so as to be rotatable. Based on the rotor rotating with respect to the housing, a detection object made of a conductive material and held by one of the housing and the rotor, one coil held by the other of the housing and the rotor, and the impedance of the coil A detection circuit for detecting the orientation of the stand with respect to the vehicle body , and a printed wiring board on which a coil and a detection circuit are respectively mounted, and when the stand is in one of a standing state and a retracted state, The stand overlaps with the coil when viewed from the direction parallel to the rotation axis, and the stand is the other of the standing state and the retracted state The can is characterized in that it is sized shaped and positioned so as not to overlap the coil when viewed in a direction parallel to the axis of rotation of the rotor relative to the housing.

  According to the present invention, since it is not necessary to bring the coil and the object to be detected into contact with each other, deterioration due to wear such as a contact can be avoided, so that the life can be extended as compared with the case where the contact is used. .

  According to a second aspect of the present invention, in the first aspect of the invention, the rotor includes an outer rotor that contacts and interlocks with the stand, an inner rotor that is fixed to the outer rotor and to which the detection target is fixed, and the housing is In the direction along the rotation axis of the rotor with respect to the housing, the inner rotor is fixed between the body to which the coil is fixed and the rotation axis of the rotor with respect to the housing. A cover sandwiched between the inner rotor and the outer rotor, and the body and the cover each have an annular shape surrounding the inner rotor, and the outer peripheral surface of the inner rotor is formed between the inner peripheral surface of the body and the inner peripheral surface of the cover. It is characterized by contacting each other.

  According to this invention, compared with the case where the outer peripheral surface of the inner rotor is brought into contact with only one of the inner peripheral surface of the body and the inner peripheral surface of the cover, rattling of the rotor with respect to the housing is suppressed, and the housing and the rotor The amount of wear is reduced by increasing the contact area and distributing the pressure.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the rotor has an outer rotor that contacts and interlocks with the stand, and an inner rotor that is fixed to the outer rotor while the detected object is fixed. The housing is fixed to the body in such a manner that the inner rotor is sandwiched between the body to which the coil is fixed and the rotation axis of the rotor with respect to the housing, and to the rotation axis of the rotor with respect to the housing. A cover sandwiched between the inner rotor and the outer rotor in the direction along the direction, and the body and the cover are in contact with the inner rotor from opposite directions in a direction along the rotation axis of the rotor with respect to the housing. It is characterized by.

  According to the present invention, rattling of the rotor with respect to the housing can be suppressed as compared with a case where only one of the body and the cover is brought into contact with the inner rotor.

  According to the first aspect of the present invention, there is provided a detection object made of a conductive material and held by one of the housing and the rotor, and a detection object held by the other of the housing and the rotor as the rotor rotates with respect to the housing. And a detection circuit for detecting the orientation of the stand with respect to the vehicle body based on the impedance of the coil, so that the coil and the detected object do not need to be in contact with each other. Since deterioration due to wear can be avoided, the life can be extended as compared with the case where contacts are used.

  According to the invention of claim 2, since the outer peripheral surface of the inner rotor is in contact with the inner peripheral surface of the body and the inner peripheral surface of the cover, the outer peripheral surface of the inner rotor is separated from the inner peripheral surface of the body and the inner peripheral surface of the cover. As compared with the case where only one of them is brought into contact, the rattling of the rotor with respect to the housing is suppressed, and the contact area between the housing and the rotor is increased to disperse the pressure, thereby reducing the amount of wear.

  According to the invention of claim 3, since the body and the cover are in contact with the inner rotor from the opposite directions in the direction along the rotation axis of the rotor with respect to the housing, only one of the body and the cover is used as the inner rotor. The rattling of the rotor with respect to the housing can be suppressed as compared with the case where they abut.

It is a disassembled perspective view which shows embodiment of this invention. It is sectional drawing which shows the same as the above. It is a perspective view which shows the use condition of a rotary sensor. It is sectional drawing which shows a prior art example. It is a disassembled perspective view which shows the same as the above.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to FIGS. 1 and 2.

  Since the basic configuration of the present embodiment is common to the conventional example described in FIGS. 3 to 5 (hereinafter simply referred to as “conventional example”), common portions are denoted by the same reference numerals and illustrated and described. Omitted. The vertical direction is based on FIG.

  In this embodiment, the sleeve 35 is not provided, and the leg portion 71 of the mounting bolt 7 is directly inserted into the shaft portion 31 b of the inner rotor 31. Further, the lower end portion of the shaft portion 31b of the inner rotor 31 protrudes below the main body portion 31a, and an insertion hole 32e into which the lower end portion of the shaft portion 31b of the inner rotor 31 is inserted is vertically located on the bottom surface of the main body portion 32a of the outer rotor 32. It is penetrated by.

  Further, the housing 2 of the present embodiment includes a body 2 a having the same shape as that of the housing 2 of the conventional example, and a cover 2 b that has an annular shape and is positioned below the first oil seal 61. In other words, the main body 31a of the inner rotor 31 is sandwiched between the body 2a and the cover 2b in the vertical direction, which is the direction along the rotation axis of the rotor 3 with respect to the housing 2.

  More specifically, the cover 2b has a flat annular main body 24 with the thickness direction directed in the vertical direction, and a cylindrical shape coaxial with the main body 24 and protrudes upward from the upper surface of the main body 24. And a cylindrical portion 25 surrounding the first oil seal 61. The outer diameter of the main body portion 24 of the cover 2b is substantially the same as the outer diameter of the main body portion 21 of the body 2a, and the outer diameter of the cylindrical portion 25 of the cover 2b is slightly smaller than the inner diameter of the main body portion 21 of the body 2a. The cover 2b is fixed to the body 2a by laser welding, for example, on the outer peripheral surface of the cylindrical portion 25 and the upper surface of a portion of the main body portion 24 that protrudes outward from the cylindrical portion 25.

  Here, the inner diameter of the body 2 a (that is, the inner diameter of the housing recess 20) is slightly larger than the outer diameter of the main body portion 31 a of the inner rotor 31, and the inner diameter of the main body portion 24 of the cover 2 b is the outer diameter of the coupling portion 31 c of the inner rotor 31. It is slightly larger than. That is, the inner peripheral surface of the housing recess 20 of the body 2 a contacts the outer peripheral surface of the main body portion 31 a of the inner rotor 31, and the inner peripheral surface of the main body portion 24 of the cover 2 b contacts the outer peripheral surface of the coupling portion 31 c of the inner rotor 31. Thereby, compared with the case where only one of the body 2a and the cover 2b is brought into contact with the outer peripheral surface of the inner rotor 31, rattling of the rotor 3 with respect to the housing 2 is suppressed, and the contact area between the housing 2 and the rotor 3 is reduced. The amount of wear is reduced by increasing the pressure and dispersing the pressure.

  Furthermore, in the present embodiment, the upper end of the cylindrical portion 25 of the cover 2b abuts on the lower surface of the main body portion 31a of the inner rotor 31, and the upper surface of the main body portion 31a of the inner rotor 31 is provided on the inner bottom surface of the housing recess 20 of the body 2a. The rattling of the rotor 3 with respect to the housing 2 is also suppressed by the lower end of the cylindrical tube projection 21b surrounding the insertion hole 20a coming into contact.

  Further, instead of the fixed contact 41 and the connected terminal 51, an annular printed wiring board 80 is fixed to the body 2a in the housing recess 20 so as to surround the cylindrical protrusion 21b with the thickness direction directed in the vertical direction. Has been. On the lower surface of the printed wiring board 80, a coil 81 and a one-chip integrated circuit are used to detect the direction of the stand S based on the impedance of the coil 81 and to generate an output corresponding to the detected direction. And a detection circuit 82 for outputting to the outside. Since the detection circuit 82 as described above can be realized by a well-known technique, detailed illustration and description thereof will be omitted.

  Further, the rotor 3 includes a detected body 36 made of a conductive material such as metal, for example, instead of the movable contact 33 and the contact pressure spring 34. The detected body 36 is held on the main body 31a of the inner rotor 31 by, for example, insert molding. Here, the detected object 36 is positioned below the coil 81 when the stand S is in one of the standing state and the retracted state, and below the coil 81 when the stand S is the other of the standing state and the retracted state. It is sized, shaped and arranged so as not to be located on the side and away from the coil 81. That is, when the stand S rotates with respect to the vehicle body, the impedance of the coil 81 changes due to the change in the distance between the coil 81 and the detected body 36 with the rotation of the rotor 3 with respect to the housing 2. Based on this change, the detection circuit 82 detects the direction of the stand S (standing state or retracted state).

  At the time of manufacture, the printed wiring board 80 is fixed to the body 2a by, for example, heat welding, and the cover 2b is attached to the body 2a with the first oil seal 61, the sliding plate 63, and the inner rotor 31 assembled to the cover 2b. Is fixed by, for example, laser welding, and then the second oil seal 62 is fitted between the body 2a and the inner rotor 31, and the outer rotor 32 is fixed to the inner rotor 31 by, for example, laser welding.

  According to the above configuration, since the coil 81 and the detected object 36 are not in contact with each other, deterioration due to wear unlike the fixed contact 41 and the movable contact 33a in the conventional example does not occur. Extension is possible.

DESCRIPTION OF SYMBOLS 1 Rotary sensor 2 Housing 2a Body 2b Cover 3 Rotor 31 Inner rotor 32 Outer rotor 36 Detected object 81 Coil 82 Detection circuit B Car body S Stand

Claims (3)

A rotary sensor used to detect the orientation of a stand relative to the body of a motorcycle,
A housing connected to the vehicle body;
A rotor that is rotatably attached to the housing and rotates relative to the housing as the stand rotates relative to the vehicle body;
A detected object made of a conductive material and held by one of the housing and the rotor;
One coil held on the other of the housing and the rotor;
A detection circuit for detecting the orientation of the stand relative to the vehicle body based on the impedance of the coil ;
A printed wiring board on which a coil and a detection circuit are mounted ,
The detected object overlaps with the coil when viewed from a direction parallel to the rotation axis of the rotor with respect to the housing when the stand is in one of the standing state and the retracted state, and when the stand is in the other of the standing state and the retracted state, A rotary sensor characterized in that it is sized and arranged so as not to overlap with a coil when viewed from a direction parallel to the rotation axis of the rotor . The rotor has an outer rotor that contacts and interlocks with the stand, and an inner rotor to which the detected body is fixed and fixed to the outer rotor,
The housing is fixed to the body in such a manner that the inner rotor is sandwiched between the body to which the coil is fixed and the rotation axis of the rotor with respect to the housing, and along the rotation axis of the rotor with respect to the housing. A cover sandwiched between the inner rotor and the outer rotor in the direction,
2. The rotary sensor according to claim 1, wherein each of the body and the cover has an annular shape surrounding the inner rotor, and an outer peripheral surface of the inner rotor is in contact with an inner peripheral surface of the body and an inner peripheral surface of the cover. The rotor has an outer rotor that contacts and interlocks with the stand, and an inner rotor to which the detected body is fixed and fixed to the outer rotor,
The housing is fixed to the body in such a manner that the inner rotor is sandwiched between the body to which the coil is fixed and the rotation axis of the rotor with respect to the housing, and along the rotation axis of the rotor with respect to the housing. A cover sandwiched between the inner rotor and the outer rotor in the direction,
3. The rotary sensor according to claim 1, wherein the body and the cover are in contact with the inner rotor from directions opposite to each other along a rotation axis of the rotor with respect to the housing.

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