JP5936432B2 - Positioning member and rotation detection device - Google Patents

Description

  The present invention relates to a positioning member and a rotation detection device, and more particularly to a positioning member attached to a hub of a wheel and a rotation detection device including the same.

  Conventionally, in order to detect the traveling speed of a bicycle, a rotation detection device that detects the rotation of a wheel has been proposed.

  For example, the rotational speed detection sensor disclosed in Patent Document 1 includes a magnetism generator that rotates with a bicycle wheel and a magnetism detector that is fixed to the front fork of the bicycle. The magnetism generating unit includes a hub fitting part and a magnet encoder. The hub fitting component is provided at one end of the hub so as to be arranged coaxially with the wheel hub. The magnet encoder is attached to the hub fitting part from the outside in the width direction of the bicycle so as to be arranged coaxially with the hub fitting part. In the rotational speed detection sensor of Patent Document 1, the hub fitting component functions as a positioning member for arranging the magnet encoder coaxially with the wheel. In such a configuration, the rotation speed of the wheel can be detected by detecting the magnetism from the magnetism generator in the magnetism detector.

JP 2010-164459 A

  By the way, when attaching the magnetic generation part of patent document 1 to the wheel of a bicycle, it is necessary to use the hub fitting components according to the shape and dimension of a wheel (especially hub and spoke). In other words, the hub fitting part of patent document 1 cannot be shared by a plurality of wheels having different shapes and dimensions. Therefore, it is necessary to manufacture a hub fitting component for each wheel having different shapes and dimensions, and the manufacturing cost of the rotation speed detection sensor is increased.

  Therefore, a main object of the present invention is to provide a positioning member that can be shared by a plurality of wheels having different shapes and dimensions, and a rotation detection device including the positioning member.

In order to achieve the above object, the positioning member according to claim 1 is sandwiched between the object and the hub in order to position the object to be provided coaxially with the wheel having the hub including the protrusion. And a hollow positioning member provided coaxially with the object and the hub , comprising a soft polymer material and configured to be elastically deformable and having a through-hole having a circular cross-section, and penetrating An outer peripheral portion having an outer peripheral surface provided coaxially with the hole, and an intermediate portion connecting the inner peripheral portion and the outer peripheral portion, and in a direction parallel to the axial direction of the positioning member, the rigidity of the inner peripheral portion is rather higher than the rigidity of the intermediate portion, the inner peripheral portion is used as a positioning reference of the object, when the positioning of the object, the object by the inner circumferential portion is supported by the outer peripheral surface of the projecting portion of the hub Positioned coaxially with the wheel It is characterized in.

  The positioning member according to claim 2 is the positioning member according to claim 1, wherein the maximum thickness of the inner peripheral portion in the parallel direction is the positioning at an intermediate position between the inner peripheral surface and the outer peripheral surface of the positioning member. The thickness of the member is larger than the thickness in the parallel direction.

  The positioning member according to claim 3 has a pair of side surfaces provided between the inner peripheral surface and the outer peripheral surface in the positioning member according to claim 2, and is provided at an intermediate position between the inner peripheral surface and the outer peripheral surface. At least one of the pair of side surfaces includes an annular recess provided coaxially with the through hole so that the thickness is smaller than the maximum thickness of the inner peripheral portion.

The rotation detection device according to claim 4 is a rotation detection device that detects rotation of a wheel having a hub including a protruding portion, and detects a magnetism generation unit that generates magnetism and magnetism generated by the magnetism generation unit. And a positioning member configured to be elastically deformable and including a soft polymer material, and positioning the magnetism generating unit by being sandwiched between the magnetism generating unit and the hub. The magnetic generating unit includes an inner peripheral portion having a circular through hole, an outer peripheral portion having an outer peripheral surface provided coaxially with the through hole, and an intermediate portion connecting the inner peripheral portion and the outer peripheral portion. The support member is disposed coaxially with the surface and supported by the outer peripheral surface. The rigidity of the inner peripheral portion of the positioning member is intermediate in the direction parallel to the axial direction of the positioning member. Rather high than the stiffness, the inner peripheral portion of the positioning member is used as a positioning reference of the magnetic field generators, when performing the positioning of the magnetic field generators, the inner peripheral portion of the positioning member is supported by the outer peripheral surface of the projecting portion of the hub Thus, the magnetism generating unit is positioned coaxially with the wheel .

  The positioning member according to claim 1 positions the object by being sandwiched between the object and the hub. Here, for example, the hub of the wheel has an annular portion to which the spoke is attached and a tapered protrusion protruding from the annular portion in the axial direction of the hub, and the maximum diameter of the protrusion is a through hole of the positioning member. Is larger than the diameter of the through hole (more specifically, the diameter of the end of the through hole on the hub side) and the minimum diameter of the protrusion is smaller than the diameter of the through hole (the diameter of the end of the through hole on the hub side) The positioning member can be easily arranged coaxially with the hub (wheel) by supporting the inner peripheral portion of the positioning member with the outer peripheral surface of the protruding portion. Therefore, for example, by combining the positioning member and the object in a coaxial manner in advance and supporting the inner peripheral portion of the positioning member with the outer peripheral surface of the protruding portion of the hub, the target can be easily arranged coaxially with the wheel.

  Since the positioning member according to claim 1 is configured to be elastically deformable, when the positioning member is sandwiched between the object and the hub, the positioning member is deformed according to the shape and size of the wheel (especially the hub and spoke). be able to. Further, since the rigidity of the inner peripheral portion of the positioning member is higher than the rigidity of the intermediate portion, it is possible to prevent the inner peripheral portion from being greatly deformed while allowing the intermediate portion to be deformed. Thus, the positioning member can be appropriately deformed according to the shape and dimensions of the wheel while the positioning member is stably supported by the hub. Therefore, the positioning member according to claim 1 can be shared by a plurality of wheels having different shapes and dimensions. In the positioning member according to claim 1, the outer peripheral surface is provided coaxially with the through hole (inner peripheral surface). Therefore, when the inner peripheral portion of the positioning member is pushed in the radial direction by the protruding portion of the hub, the positioning member is deformed so that the inner peripheral surface and the outer peripheral surface are positioned coaxially. In other words, the positioning member is deformed so that the elastic force generated in the positioning member is uniform in the circumferential direction. Therefore, by supporting the object on the outer peripheral surface of the positioning member, even when the inner peripheral part of the positioning member is pushed in the radial direction by the protruding part of the hub, the object can be easily coaxial with the wheel (hub). Can be placed.

  In the positioning member according to claim 2, the rigidity of the inner peripheral portion can be easily increased by making the maximum thickness of the inner peripheral portion larger than the thickness at the intermediate position between the inner peripheral surface and the outer peripheral surface. .

  In the positioning member according to the third aspect, the rigidity of the intermediate portion can be easily lowered with respect to the inner peripheral portion by forming the concave portion on at least one side surface. Thereby, a positioning member can be changed easily and positioning of a subject becomes easy.

  In the rotation detection device according to the fourth aspect, the magnetism generating unit can be positioned by the positioning member having the same configuration as the positioning member according to the first aspect. However, the magnetism generating unit can be easily and appropriately positioned. Specifically, the magnetism generating unit has a support surface provided coaxially with the outer peripheral surface of the positioning member at the center thereof. In this case, by supporting the support surface with the outer peripheral surface so that the outer peripheral surface of the positioning member and the support surface of the magnetism generating unit are in close contact with each other, the magnetism generating unit can be easily arranged coaxially with the wheel. As described above, the rotation detection device according to claim 4 can be shared by a plurality of wheels having different shapes and dimensions.

  According to the present invention, a positioning member that can be shared by a plurality of wheels having different shapes and dimensions, and a rotation detection device including the positioning member are obtained.

It is a left view which shows the bicycle with which the rotation detection apparatus of one Embodiment of this invention was attached. It is the perspective view which looked at the center part of the front wheel and the rotation detection device from the diagonally left front. It is the perspective view which looked at the center part of the front wheel and the rotation detection device from diagonally right front. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is a cross-sectional solution figure which shows the relationship between a front wheel and a rotation detection apparatus. It is a figure which shows a positioning member, (a) is a left view, (b) is sectional drawing, (c) is a right view. It is a left view which shows a magnetism generation unit. It is a right view which shows a magnetic generation unit. It is sectional drawing solution figure which shows the state of the positioning member at the time of attaching a magnetic generation unit to a front wheel, (a) shows the state of the positioning member before attaching a magnetic generation unit to a front wheel, (b) is a magnetic generation unit in a front wheel. The state of the positioning member before is fixed is shown, and (c) shows the state of the positioning member when the magnetism generating unit is fixed to the front wheel. It is a figure which shows the positioning member and magnetism generation unit which were attached to the front wheel which has another shape and dimension. It is a figure which shows the other example of a positioning member.

  Embodiments of the present invention will be described below with reference to the drawings. Below, the case where the rotation detection apparatus 12 provided with the positioning member 10 which concerns on this invention is attached to the bicycle 14 is demonstrated. The left and right, front and rear, and top and bottom of the embodiment of the present invention mean left and right, front and rear, and top and bottom, based on a state where the driver is seated on the saddle 40 of the bicycle 14 toward the handle 30.

  FIG. 1 is a left side view showing a bicycle 14 to which a rotation detection device 12 according to an embodiment of the present invention is attached. In FIG. 1, the rotation detection device 12 is shown in a simplified manner in order to avoid the drawing from being complicated.

  Referring to FIG. 1, a bicycle 14 has a frame 16 extending in the front-rear direction. The frame 16 includes a head tube 18, a down tube 20, a saddle tube 22, a pair of chain stays 24 (only the left chain stay 24 is shown in FIG. 1), and a pair of saddle stays 26 (only the left saddle stay 26 is shown in FIG. 1). Included).

  A handle stem 28 is rotatably inserted into the head tube 18. A handle 30 is provided at the upper end of the handle stem 28. The steering wheel 30 is provided with a display device 31 that displays the traveling speed of the bicycle 14. The display device 31 includes, for example, a CPU and a memory, and calculates the traveling speed of the bicycle 14 based on a signal given from a magnetic detection unit 94 (described later) of the rotation detection device 12. A front fork 32 is provided at the lower end of the handle stem 28. The front fork 32 has a pair of leg portions 32a (only the left leg portion 32a is shown in FIG. 1). A front wheel 36 is rotatably supported on the lower ends of the pair of leg portions 32a via an axle 34.

  A saddle pipe 38 is inserted into the saddle tube 22. A saddle 40 is provided at the upper end of the saddle pipe 38. A rear wheel 44 is rotatably supported at the rear ends of the pair of chain stays 24 via an axle 42.

  A drive mechanism 46 for driving the rear wheel 44 is provided so as to be supported by the frame 16 between the front wheel 36 and the rear wheel 44. The drive mechanism 46 includes a crank 46a and a pair of pedals 46b (only the left pedal 46b is shown in FIG. 1).

2 is a perspective view of the center portion of the front wheel 36 and the rotation detection device 12 as viewed from the left diagonal front, and FIG. 3 is a perspective view of the center portion of the front wheel 36 and the rotation detection device 12 as viewed from the right diagonal front. is there. 4 is a cross-sectional view taken along the line AA in FIG. 3, and FIG.
1 to 5, the front wheel 36 includes a hub 48 (see FIGS. 2 to 5), a rim 50 (see FIG. 1), and a plurality of spokes 52 that connect the hub 48 and the rim 50. The axle 34 is inserted into the hub 48. 2 to 5, in this embodiment, the hub 48 has a symmetrical shape, and includes a main body 54 and a pair of outer ring portions 56 (only one outer ring portion 56 is shown in FIGS. 2 to 5). , And a pair of flange portions 58 (only one flange portion 58 is shown in FIGS. 2 to 5).

  The main body 54 has a cylindrical shape and extends in the thickness direction of the positioning member 10 (the width direction of the bicycle 14). The pair of outer ring portions 56 have a cylindrical shape and are provided at both ends of the main body portion 54. The outer ring portion 56 has a larger diameter than the main body portion 54. Each flange portion 58 is provided at one end portion of the outer ring portion 56. A plurality of spokes 52 are connected to the pair of flange portions 58, respectively.

  Referring to FIG. 5, each flange portion 58 extends from the outer ring portion 56 to the outer ring portion 58 in the radial direction of the outer ring portion 56, and from the inner peripheral portion of the annular portion 58 a to the outer side in the width direction of the bicycle 14. The protrusion part 58b which protrudes is included. The protruding portion 58 b has a circular shape in a cross section perpendicular to the axial direction of the hub 48. More specifically, the protrusion 58b has a hollow taper shape (hollow frustoconical shape) so that the diameter decreases as the distance from the annular portion 58a increases. The annular portion 58 a and the protruding portion 58 b are provided coaxially with the axle 34.

  3 to 5, a plurality of spokes 52 are attached to the annular portion 58a. In this embodiment, half the spokes 52 of the plurality of spokes 52 attached to the annular portion 58a extend from the annular portion 58a toward one side (outside in the width direction of the bicycle 14), and then the rim 50 (see FIG. The other half of the spokes 52 extend from the annular portion 58a toward the other side (inward in the width direction of the bicycle 14), and then extend toward the rim 50 (see FIG. 1). In this embodiment, a plurality of spokes 52 extending from the annular part 58a toward one side and a plurality of spokes 52 extending from the annular part 58a toward the other side are alternately provided in the circumferential direction of the annular part 58a. 2 to 5, only the plurality of spokes 52 attached to one (left side in this embodiment) flange portion 58 (annular portion 58a) are shown, but the other (right side in this embodiment) is shown. Similarly, a plurality of spokes 52 are attached to the flange portion 58 (annular portion 58a).

  Referring to FIG. 5, one end portion (left end portion) of axle 34 is supported by one leg portion 32a of front fork 32, and the other end portion (right end portion) of axle 34 is the other leg portion 32a (see FIG. 5). (Not shown).

  As the front wheel 36, various known wheels can be used. Further, since various known wheels can be used as the rear wheel 44, a detailed description thereof will be omitted, but the rear wheel 44 has, for example, a hub, a rim, and a spoke similarly to the front wheel 36.

  A cylindrical inner ring member 60 and a fastening member 62 are fitted to one end of the axle 34. The inner ring member 60 is attached to the axle 34 so that a part of the inner ring member 60 is located in the outer ring portion 56. The inner ring member 60 and the fastening member 62 are screwed onto the axle 34, for example. As the fastening member 62, for example, a nut is used. In this embodiment, the position of the inner ring member 60 is fixed by tightening the fastening member 62. A plurality of balls 64 are provided so as to be supported by the outer ring portion 56 and the inner ring member 60. Although not shown, the other end portion of the axle 34 is similarly provided with an inner ring member 60, a fastening member 62, and a plurality of balls 64. In this embodiment, the outer ring portion 56, the inner ring member 60, and the plurality of balls 64 function as bearings. Thereby, the hub 48 is rotatably supported on the axle 34. That is, the front wheel 36 is rotatably supported on the axle 34.

  2 to 5, the positioning member 10 and the magnetism generating unit 66 are provided coaxially with the front wheel 36. In this embodiment, the magnetism generating unit 66 corresponds to an object.

  6A and 6B are diagrams showing the positioning member 10, wherein FIG. 6A is a left side view, FIG. 6B is a cross-sectional view, and FIG. 6C is a right side view.

  5 and 6, positioning member 10 includes an elastic material and is configured to be elastically deformable. As the positioning member 10, for example, a soft polymer material (for example, elastic rubber) having a hardness of 80 degrees or less as measured according to JIS K 6253 can be used.

  The positioning member 10 has a hollow substantially disk shape, and has an inner peripheral surface 68, an outer peripheral surface 70, a first side surface 72, and a second side surface 74. In this embodiment, a circular cross-section is passed through the central portion of the positioning member 10 so that the inner peripheral surface 68 has a circular shape in a cross section perpendicular to the axial direction C (see FIG. 6B) of the positioning member 10. A hole 69 is formed. The outer peripheral surface 70 is provided coaxially with the through hole 69 (inner peripheral surface 68). In this embodiment, the outer peripheral surface 70 has a circular shape in a cross section perpendicular to the axial direction C of the positioning member 10.

  The first side surface 72 is the left side surface of the positioning member 10, and the second side surface 74 is the right side surface of the positioning member 10. The first side surface 72 includes an annular open surface 72a, a cylindrical guide surface 72b, and an annular locking surface 72c. The open surface 72a, the guide surface 72b, and the locking surface 72c are provided coaxially with the through hole 69 (inner peripheral surface 68). The locking surface 72c is provided closer to the second side surface 74 than the open surface 72a. The guide surface 72b extends parallel to the axial direction C of the positioning member 10 and connects the outer edge of the open surface 72a and the inner edge of the locking surface 72c. In the radial direction of the positioning member 10, the guide surface 72 b is provided inside the outer peripheral surface 70.

  The second side surface 74 includes an annular recess 74a provided coaxially with the through hole 69 (inner peripheral surface 68). The recess 74a is curved in a substantially arc shape in a cross section (see FIG. 6B) passing through the center of the positioning member 10 and perpendicular to the open surface 72a so as to be recessed toward the first side surface 72 side.

  With reference to FIG. 6B, in the direction parallel to the axial direction C of the positioning member 10, the rigidity of the inner peripheral part 10a is higher than the rigidity of the outer peripheral part 10b and higher than the rigidity of the intermediate part 10c. . In this embodiment, the maximum thickness (maximum thickness in the direction parallel to the axial direction C of the positioning member 10) t1 of the inner peripheral portion 10a is the intermediate member between the inner peripheral surface 68 and the outer peripheral surface 70. Thickness (thickness in a direction parallel to the axial direction C of the positioning member 10) t2 is greater.

  In this embodiment, when the positioning member 10 is concentrically divided into three so that the dimensions in the radial direction are equal, the portion including the inner peripheral surface 68 (the innermost portion) is the inner peripheral portion 10a. The portion including the outer peripheral surface 70 (the outermost portion) is defined as the outer peripheral portion 10b, and the portion connecting the inner peripheral portion 10a and the outer peripheral portion 10b (the portion between the inner peripheral portion 10a and the outer peripheral portion 10b) is intermediate. Part 10c.

  FIG. 7 is a left side view showing the magnetism generating unit 66, and FIG. 8 is a right side view showing the magnetism generating unit 66.

  5, 7 and 8, the magnetism generating unit 66 includes an annular magnet 76 (see FIGS. 5 and 7), an annular yoke 78 (see FIGS. 5 and 8), and a magnet. 76 and a hollow holding member 80 that holds the yoke 78. Referring to FIG. 7, in magnet 76, a plurality of N poles and a plurality of S poles are alternately arranged in the circumferential direction. Referring to FIG. 5, yoke 78 is provided so as to cover one side surface (right side surface in this embodiment) of magnet 76. The holding member 80 is made of, for example, a resin material. In this embodiment, the magnet 76 and the yoke 78 are held by the holding member 80 by insert molding.

  Referring to FIGS. 5, 7, and 8, the holding member 80 includes a hollow substantially disk-shaped main body portion 82 and a plurality of (three in this embodiment) attachment portions 84 extending in the radial direction from the main body portion 82. Have. The magnet 76 and the yoke 78 are held by the main body portion 82.

  Referring to FIGS. 5 and 8, the main body 82 has a cylindrical support surface 86, an annular locking surface 88, and a cylindrical guide surface 90 at the center thereof. The support surface 86, the locking surface 88, and the guide surface 90 are provided coaxially with the magnet 76. The locking surface 88 extends perpendicular to the axial direction of the main body 82 and connects the support surface 86 and the guide surface 90. 7 and 8, each attachment portion 84 has a plurality of (five in this embodiment) through holes 84a. In addition, as the magnetic generation unit 66, a magnetic generation unit of a known cycle computer (rotational speed detection device) used in a known bicycle can be used. Therefore, the detailed description of the magnetic generation unit 66 is omitted.

  With reference to FIGS. 2 to 5, the holding member 80 (magnetic generation unit 66) is attached to the front wheel 36 by a plurality of (three in this embodiment) bands 92. Thereby, the magnetism generating unit 66 rotates integrally with the front wheel 36. In this embodiment, the attachment portion 84 is fixed to the two spokes 52 by the band 92 while the band 92 is passed through any two through holes 84 a of the attachment portion 84.

  FIG. 9 is a cross-sectional view illustrating a state of the positioning member 10 when the magnetic generation unit 66 is attached to the front wheel 36. FIG. 9A illustrates a state of the positioning member 10 before the magnetic generation unit 66 is attached to the front wheel 36. (B) shows the state of the positioning member 10 before the magnetic generation unit 66 is fixed to the front wheel 36, and (c) shows the state of the positioning member 10 when the magnetic generation unit 66 is fixed to the front wheel 36. Show.

  Referring to FIG. 9A, in this embodiment, the diameter d1 of the through hole 69 (inner peripheral surface 68) of the positioning member 10 is smaller than the maximum diameter d2 of the protrusion 58b of the hub 48, and the protrusion 58b. Greater than the minimum diameter d3. When attaching the magnetism generating unit 66 to the front wheel 36, first, the positioning member 10 is attached to the central portion of the holding member 80 (magnetism generating unit 66). Specifically, the opening surface 72a of the positioning member 10 is exposed from the holding member 80 toward the outside of the bicycle 14, and the guide surface 72b of the positioning member 10 is positioned inside the guide surface 90 of the holding member 80. The positioning member 10 is fitted into the holding member 80. By fitting the positioning member 10 into the holding member 80 in this way, the guide surface 90 of the holding member 80 and the guide surface 72b of the positioning member 10 are brought into close contact with each other, and the support surface 86 of the holding member 80 and the outer peripheral surface of the positioning member 10. 70 is in close contact. Thereby, the guide surface 90 is supported by the guide surface 72 b and the support surface 86 is supported by the outer peripheral surface 70.

  Next, referring to FIG. 9B, the protruding portion 58 b of the hub 48 is fitted into the through hole 69 of the positioning member 10. At this time, the inner peripheral portion 10a of the positioning member 10 is supported by the outer peripheral surface of the protruding portion 58b so that the positioning member 10 and the magnetism generating unit 66 are arranged coaxially with the protruding portion 58b.

  Finally, referring to FIG. 9C, the plurality of bands 92 (see FIG. 5) are tightened to push the magnetism generating unit 66 (holding member 80) into the spoke 52 side. Specifically, the band 92 (see FIG. 5) so that the holding member 80 contacts a plurality of spokes 52 (in this embodiment, half of the plurality of spokes 52 attached to the annular portion 58 a). Tighten. Thereby, the magnetism generating unit 66 is attached to the front wheel 36.

  In this embodiment, when the magnetism generating unit 66 is pushed into the spoke 52 side, the locking surface 72c of the positioning member 10 is pressed by the locking surface 88 of the holding member 80, and the outer peripheral portion 10b is spoken. It is pushed into the 52 side. Here, the inner peripheral part 10a is supported by the protrusion part 58b, and the rigidity of the inner peripheral part 10a is higher than the rigidity of the intermediate part 10c. In this case, even if the outer peripheral part 10b is pushed into the spoke 52 side, the holding part 80 is moved to the spoke 52 side while preventing the inner peripheral part 10a from being greatly deformed by the deformation of the intermediate part 10c. Can do. Thereby, the magnetism generating unit 66 can be easily disposed at a predetermined position (in this embodiment, the position where the holding member 80 contacts the spoke 52).

  Further, as described above, since the diameter d1 of the through hole 69 (inner peripheral surface 68) is smaller than the maximum diameter d2 of the protruding portion 58b, the inner peripheral portion 10a is protruded by pushing the holding member 80 toward the spoke 52 side. The outer peripheral surface 58b is pushed in the radial direction. Here, the support surface 86 and the guide surface 90 of the holding member 80, the inner peripheral surface 68, the outer peripheral surface 70 and the guide surface 72b of the positioning member 10, and the outer peripheral surface of the protruding portion 58b of the hub 48 have a circular cross section. Furthermore, the support surface 86 and the guide surface 90 are provided coaxially, and the inner peripheral surface 68, the outer peripheral surface 70, and the guide surface 72b are provided coaxially. Therefore, when the inner peripheral portion 10a is pushed in the radial direction by the outer peripheral surface of the protruding portion 58b, the positioning member 10 has the inner peripheral surface 68 (through hole 69), the outer peripheral surface 70, and the guide surface 72b positioned coaxially. Deform to In other words, the positioning member 10 is deformed so that the elastic force generated in the positioning member 10 is substantially uniform in the circumferential direction. Thereby, the magnetism generating unit 66 (magnet 76) can be easily arranged coaxially with the hub 48.

  Referring to FIGS. 2 and 5, a magnetic detection unit 94 is attached to the lower end portion of the leg portion 32 a of the front fork 32. The magnetic detection unit 94 includes a magnetic detection unit 96 and a plate-shaped holding member 98 that holds the magnetic detection unit 96. In this embodiment, the rotation detection device 12 includes the positioning member 10, the magnetic generation unit 66, and the magnetic detection unit 94.

  The magnetic detection unit 96 includes, for example, a Hall IC (not shown) and is electrically connected to the display device 31 (see FIG. 1) via an electric wire (not shown). The magnetism detecting unit 96 detects magnetism generated by the magnet 76 (see FIG. 5) of the magnetism generating unit 66 and gives a detection signal to the display device 31 (see FIG. 1).

  Referring to FIG. 5, holding member 98 is fixed to leg portion 32 a by fastening member 100. In this embodiment, a nut is used as the fastening member 100. As the magnetic detection unit 94, a magnetic detection unit of a known cycle computer (rotational speed detection device) used in a known bicycle can be used. Therefore, detailed description of the magnetic detection unit 94 is omitted.

Hereinafter, the effect of the positioning member 10 will be described.
The positioning member 10 positions the magnetism generating unit 66 by being sandwiched between the magnetism generating unit 66 (holding member 80) and the hub 48. In this embodiment, the positioning member 10 can be easily arranged coaxially with the hub 48 (front wheel 36) by supporting the inner peripheral portion 10a of the positioning member 10 with the outer peripheral surface of the protruding portion 58b of the hub 48. Therefore, the magnetic generation unit 66 can be easily assembled by previously combining the positioning member 10 and the magnetic generation unit 66 in a coaxial manner and supporting the inner peripheral portion 10a of the positioning member 10 with the outer peripheral surface of the protruding portion 58b of the hub 48. It can be arranged coaxially with the front wheel 36.

  Since the positioning member 10 is configured to be elastically deformable, when the positioning member 10 is sandwiched between the magnetism generating unit 66 and the hub 48, the positioning member 10 depends on the shape and size of the front wheel 36 (particularly, the hub 48 and the spoke 52). Can be deformed. Moreover, since the rigidity of the inner peripheral part 10a of the positioning member 10 is higher than the rigidity of the intermediate part 10c, it is possible to prevent the inner peripheral part 10a from being greatly deformed while allowing the intermediate part 10c to be deformed. Accordingly, the positioning member 10 can be appropriately deformed according to the shape and dimensions of the front wheel 36 while the positioning member 10 is stably supported by the hub 48. Therefore, the positioning member 10 can be shared by a plurality of wheels having different shapes and dimensions. Further, by using the positioning member 10, the magnetism generating unit 66 can be appropriately positioned with respect to a plurality of wheels having different shapes and dimensions. Thereby, rotation detection device 12 can be shared by a plurality of wheels having different shapes and dimensions.

  FIG. 10 is a view showing the positioning member 10 and the magnetism generating unit 66 attached to the front wheel 36 a having a shape and size different from those of the front wheel 36. The front wheel 36 is different from the front wheel 36 a in that a hub 102 is used instead of the hub 48 and a plurality of spokes 104 are used instead of the plurality of spokes 52. The hub 102 differs from the hub 48 in that it has an annular portion 106a having a diameter larger than the annular portion 58a and a protruding portion 106b having a diameter larger than the protruding portion 58b. In the front wheel 36a, all the spokes 104 attached to the annular portion 106a extend inward (inward in the width direction of the bicycle) from the annular portion 106a and then extend toward the rim 50 (see FIG. 1).

  Referring to FIG. 10, even when the magnetism generating unit 66 is attached to the front wheel 36a, magnetism is generated by supporting the inner peripheral portion 10a of the positioning member 10 with the outer peripheral surface of the protruding portion 106b and deforming the positioning member 10. The unit 66 can be easily and appropriately positioned. As described above, in the positioning member 10, by using the inner peripheral portion 10a as a positioning reference, even in the front wheel 36a having a shape and size different from the front wheel 36 (particularly, the shape and size of the hub and the spoke), magnetism is generated. The unit 66 can be easily and appropriately positioned.

  In the positioning member 10, the outer peripheral surface 70 is provided coaxially with the through hole 69 (inner peripheral surface 68). Therefore, when the inner peripheral portion 10a of the positioning member 10 is pushed in the radial direction by the protruding portion 58b (the protruding portion 106b) of the hub 48 (hub 102), the inner peripheral surface 68 and the outer peripheral surface 70 of the positioning member 10 are coaxial. It deforms so that it is located in a shape. In other words, the positioning member 10 is deformed so that the elastic force generated in the positioning member 10 is uniform in the circumferential direction. Therefore, by supporting the magnetism generating unit 66 on the outer peripheral surface 70 of the positioning member 10, the inner peripheral portion 10a of the positioning member 10 is pushed in the radial direction by the protruding portion 58b (the protruding portion 106b) of the hub 48 (hub 102). Even in this case, the magnetism generating unit 66 can be easily arranged coaxially with the hub 48 (hub 102). That is, the magnetism generating unit 66 can be easily arranged coaxially with the front wheel 36 (front wheel 36a).

  In the rotation detection device 12, the magnetism generating unit 66 (holding member 80) has a support surface 86 provided coaxially with the outer peripheral surface 70 at the center thereof. And the support surface 86 is supported by the outer peripheral surface 70 so that the outer peripheral surface 70 and the support surface 86 may closely_contact | adhere. When the outer peripheral surface 70 of the positioning member 10 and the support surface 86 of the magnetism generating unit 66 come into close contact with each other, the radial expansion of the positioning member 10 is restricted by the support surface 86. For this reason, when the inner peripheral portion 10 a is expanded in the radial direction by fitting the protrusion 58 b (protrusion 106 b) of the hub 48 (hub 102) into the through hole 69 of the positioning member 10, the elastic force is exerted on the positioning member 10. Will occur. At this time, as described above, the positioning member 10 is deformed so that the elastic force generated in the positioning member 10 is substantially uniform in the circumferential direction. Thereby, the magnetism generating unit 66 (holding member 80) can be easily and appropriately arranged coaxially with the hub 48 (hub 102). As described above, in the rotation detection device 12, the magnetism generating unit 66 can be easily and appropriately positioned using the elastic force generated in the positioning member 10.

  In the positioning member 10, the rigidity of the inner peripheral portion 10a can be easily increased by making the maximum thickness t1 of the inner peripheral portion 10a larger than the thickness t2 at the intermediate position between the inner peripheral surface 68 and the outer peripheral surface 70. it can.

  In the positioning member 10, by forming the recess 74a in the second side surface 74, the rigidity of the intermediate portion 10c can be easily lowered with respect to the inner peripheral portion 10a. Thereby, the positioning member 10 can be easily deformed, and positioning of the magnetism generating unit 66 is facilitated.

  In the above-described embodiment, the outer peripheral surface 70 and the guide surface 72b are both in contact with the magnetism generating unit 66 (holding member 80) as the object, but only one of the outer peripheral surface 70 and the guide surface 72b is the object. It may be in contact with. In addition, when the guide surface 72b contacts an object, the guide surface 72b also functions as an outer peripheral surface for supporting the object.

  In the above-described embodiment, the case where the concave portion 74a curved in a substantially circular arc shape is provided in the second side surface 74, but the shape of the concave portion provided in the second side surface of the positioning member is not limited to the above example. For example, a concave portion 110a having a substantially rectangular cross section may be provided on the second side surface 110 as in the positioning member 108 shown in FIG. 11A. A concave portion 114a having a substantially V-shaped cross section may be provided on the two side surfaces 114, and the second side surface so that the thickness of the positioning member 116 itself is substantially uniform like the positioning member 116 shown in FIG. A recess 118 a may be provided in 118.

  In the above-described embodiment, the position of one end (left end) of the inner peripheral surface 68 and the position of one end (left end) of the guide surface 72b are substantially equal in a direction parallel to the axial direction C of the positioning member 10. Although the positioning member 10 is configured, the positional relationship between the inner peripheral surface and the guide surface is not limited to the above example. For example, as in positioning members 120 and 122 shown in FIGS. 11D and 11E, one end (left end) of the inner peripheral surfaces 68a and 68b is positioned on the outer side (left side) than one end (left end) of the guide surface 72b. As described above, the thickness of the inner peripheral edge of the positioning members 120 and 122 may be further increased. Further, for example, as in the positioning member 124 shown in FIG. 11 (f), the positioning member 124 is arranged such that one end (left end) of the guide surface 72 d is positioned on the outer side (left side) than one end (left end) of the inner peripheral surface 68. You may adjust the thickness.

  In the above-described embodiment, the case where the positioning member is made of an elastic material has been described. However, the positioning member may further include another material in addition to the elastic material. For example, a cylindrical metal member may be provided on the inner periphery or the inner periphery of the positioning member. In this case, the rigidity of the inner peripheral portion of the positioning member can be easily improved by the metal member.

  In the above-described embodiment, the case where the rotation detection device 12 is provided on the front fork 32 and the front wheel 36 has been described. However, the positioning member may be provided on the saddle stay 26 (or chain stay 24) and the rear wheel 44.

  In the above-described embodiment, the case where the magnetic generation unit 66 is positioned using the positioning member 10 has been described. However, the object positioned by the positioning member according to the present invention is not limited to the magnetic generation unit, and the positioning member It may be used for positioning other objects.

10, 108, 112, 116, 120, 122, 124 Positioning member 10a Inner peripheral part 10b Outer peripheral part 10c Intermediate part 12 Rotation detection device 14 Bicycle 36, 36a Front wheel 44 Rear wheel 48, 102 Hub 58a, 106a Annular part 58b, 106b Protrusion 66 Magnetic generation unit 68, 68a, 68b Inner peripheral surface 69 Through hole 70 Outer peripheral surface 72 First side surface 74, 110, 114, 118 Second side surface 74a, 110a, 114a, 118a Concave portion 94 Magnetic detection unit

Claims (4)

A hollow provided to be sandwiched between the object and the hub and coaxial with the object and the hub in order to perform positioning of the object to be provided coaxially with the wheel having the hub including the protrusion. A positioning member having a shape,
Constructed to be elastically deformable , including soft polymer material ,
An inner peripheral portion having a circular cross-sectional through hole, an outer peripheral portion having an outer peripheral surface provided coaxially with the through hole, and an intermediate portion connecting the inner peripheral portion and the outer peripheral portion;
In a direction parallel to the axial direction of the positioning member, the rigidity of the inner peripheral portion rather higher than the rigidity of the intermediate portion,
The inner peripheral portion is used as a positioning reference for the object. When the object is positioned, the inner peripheral portion is supported by the outer peripheral surface of the projecting portion of the hub, whereby the object is moved to the wheel. A positioning member that is positioned coaxially with the positioning member.   The maximum thickness of the inner peripheral portion in the parallel direction is greater than a thickness of the positioning member in the parallel direction at an intermediate position between the inner peripheral surface of the positioning member and the outer peripheral surface. Positioning member. A pair of side surfaces provided between the inner peripheral surface and the outer peripheral surface;
The at least one of the pair of side surfaces includes an annular recess provided coaxially with the through hole so that the thickness of the intermediate position is smaller than the maximum thickness of the inner peripheral portion. The positioning member according to 1. A rotation detection device for detecting rotation of a wheel having a hub including a protrusion ,
A magnetism generating unit for generating magnetism;
A magnetic detection unit for detecting magnetism generated by the magnetic generation unit;
A positioning member configured to be elastically deformable including a soft polymer material and positioning the magnetic generation unit by being sandwiched between the magnetic generation unit and the hub;
The positioning member includes an inner peripheral portion having a through-hole having a circular cross section, an outer peripheral portion having an outer peripheral surface provided coaxially with the through-hole, and an intermediate portion connecting the inner peripheral portion and the outer peripheral portion,
The magnetic generation unit has a support surface that is arranged coaxially with the outer peripheral surface of the positioning member and supported by the outer peripheral surface,
In a direction parallel to the axial direction of the positioning member, the rigidity of the inner peripheral portion of the positioning member rather higher than the rigidity of the intermediate portion,
The inner peripheral portion of the positioning member is used as a positioning reference for the magnetism generating unit. When positioning the magnetism generating unit, the inner peripheral portion of the positioning member is supported by the outer peripheral surface of the projecting portion of the hub. Thus , the rotation detecting device is configured such that the magnetism generating unit is positioned coaxially with the wheel .

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