JP2016016718A - Hub structure with built-in motor, and bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hub structure with a built-in motor capable of preventing occurrence of noise due to deviance between the ring body and hub body comprising an internal gear, and to provide a bicycle therewith.SOLUTION: A hub unit 30 with a built-in motor comprises: a hub body 46 provided rotatably to the hub shafts 42, 44; a motor 48 disposed inside the hub body 46 and rotating the hub body 46; and a reduction gear 80 disposed inside the hub body 46 and decelerating the rotation of the motor 48 to transmit to the hub body 46. The reduction gear 80 comprises an annular body 96 having an internal gear 96A engaged with a planetary gear 88 at an inner peripheral side, and plural bolts 98 fastening and fixing the annular body 96 to a cover 92 of the hub body 46. Further, the facing part in which the surface of the cover 92 of the hub body 46 faces that of the annular body 96 is joined with an adhesive 130 so that the surfaces of the cover 92 and the annular body 96 are not relatively misaligned.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a motor built-in hub structure and a bicycle.

  Patent Document 1 below discloses a hub unit for an electric wheel that includes a motor housed therein and a hub that is driven to rotate by the rotation of the motor. In this electric wheel hub unit, the hub is rotatably supported by a fixing support shaft, and a planetary gear speed reduction mechanism that reduces the rotation of the motor and transmits it to the hub is provided inside the hub. The planetary gear speed reduction mechanism includes a ring body on which internal teeth meshed with the planetary gear are formed, and the ring body is screwed to the inner surface of the hub.

JP 2006-96059 A (see, for example, FIG. 2)

  In the electric wheel hub unit described in Patent Document 1, the ring body is fixed to the inner surface of the side portion of the hub only by bolts. In such a configuration, for example, when switching between the normal driving state and the regenerative state in which the brake is operated, the direction of the torque received by the inner teeth of the ring body changes, so a deviation occurs between the ring body and the hub. , Abnormal noise may occur.

  The present invention has been made in view of the above problems, and provides a hub structure with a built-in motor and a bicycle capable of suppressing the generation of abnormal noise due to a shift between an annular body having an internal gear and a hub body. The purpose is to do.

  A hub structure with a built-in motor according to a first aspect of the present invention is a hub body that is rotatably provided with respect to a hub shaft that is fixed to a vehicle body, and is provided inside the hub body to rotate the hub body. A motor, a speed reduction mechanism that is provided inside the hub body and decelerates the rotation of the motor and transmits it to the hub body, and an internal gear that is provided in the speed reduction mechanism and meshes with a planetary gear on the inner peripheral side. An annular body provided; a plurality of fastening means for fastening and fixing the annular body to the hub body; and a surface of the hub body and a surface of the annular body that are provided at opposing portions facing each other, Joining means for joining so that the surface of the annular body does not relatively shift, and the joining means is applied between the surface of the hub body and the surface of the annular body, and the hub body It is the adhesive agent which joins the surface of and the surface of the said annular body.

  In the first aspect of the present invention, the hub body is rotatably provided with respect to the hub shaft fixed to the vehicle body, and the rotation of the motor inside the hub body is performed by the reduction mechanism provided inside the hub body. Is transmitted to the hub body. The speed reduction mechanism is provided with an annular body provided with an internal gear meshing with a planetary gear on the inner peripheral side, and the annular body is fixed to the hub body by a plurality of fastening means. Furthermore, a joining means for joining the face of the hub body and the face of the annular body so as not to be relatively displaced is provided at the facing portion where the face of the hub body and the face of the annular body face each other. Is an adhesive that joins the surface of the hub body and the surface of the annular body. In this structure, the annular body and the hub body are firmly fixed by the plurality of fastening means and the joining means, and the hub body is provided by the joining means provided at the facing portion between the surface of the hub body and the surface of the annular body. The relative displacement of the surface of the ring and the surface of the annular body is suppressed. For this reason, generation | occurrence | production of the noise by the shift | offset | difference between an annular body and a hub body can be suppressed.

  In addition, since the surface of the hub body and the surface of the annular body are joined by an adhesive applied therebetween, it is possible to effectively shift the surface of the hub body and the surface of the annular body relatively. Can be suppressed. Further, since the fixing force can be distributed by the plurality of fastening means and joining means, a small fastening means can be used, and the motor built-in hub structure can be reduced in size and weight.

  According to a second aspect of the present invention, there is provided a hub body rotatably provided with respect to a hub shaft fixed to a vehicle body, a motor provided inside the hub body and rotating the hub body, and the hub body A reduction mechanism that reduces the rotation of the motor and transmits it to the hub body, and an annular body that is provided in the reduction mechanism and has an internal gear that meshes with a planetary gear on the inner peripheral side, A plurality of fastening means for fastening and fixing the annular body to the hub body; and a surface of the hub body and a surface of the annular body that are provided in opposing portions, and the surface of the hub body and the surface of the annular body Joining means so as not to be relatively displaced, and the joining means is provided on a surface of the hub body on an engagement portion provided on one of the surface of the hub body and the surface of the annular body. And the other of the surfaces of the annular body is engaged.

  In the second aspect of the invention, the hub body is rotatably provided with respect to the hub shaft fixed to the vehicle body, and the rotation of the motor inside the hub body is performed by the reduction mechanism provided inside the hub body. Is transmitted to the hub body. The speed reduction mechanism is provided with an annular body provided with an internal gear meshing with a planetary gear on the inner peripheral side, and the annular body is fixed to the hub body by a plurality of fastening means. Furthermore, a joining means for joining the face of the hub body and the face of the annular body so as not to be relatively displaced is provided at the facing portion where the face of the hub body and the face of the annular body face each other. Is configured such that the other of the surface of the hub body and the surface of the annular body is engaged with the engaging portion provided on one of the surface of the hub body and the surface of the annular body. In this structure, the annular body and the hub body are firmly fixed by the plurality of fastening means and the joining means, and the hub body is provided by the joining means provided at the facing portion between the surface of the hub body and the surface of the annular body. The relative displacement of the surface of the ring and the surface of the annular body is suppressed. For this reason, generation | occurrence | production of the noise by the shift | offset | difference between an annular body and a hub body can be suppressed.

  In addition, since the other of the surface of the hub body and the surface of the annular body is engaged with the engaging portion provided on one of the surface of the hub body and the surface of the annular body, the surface of the hub body and the surface of the annular body Can be effectively suppressed. Further, since the fixing force can be distributed by the plurality of fastening means and joining means, a small fastening means can be used, and the motor built-in hub structure can be reduced in size and weight.

  According to a third aspect of the present invention, in the motor built-in hub structure according to the first aspect, the outer peripheral surface of the annular body and the inner peripheral surface of the hub body are joined by the adhesive.

  In the invention according to claim 3, the outer peripheral surface of the annular body and the inner peripheral surface of the hub body are joined by an adhesive, and the outer peripheral surface of the annular body and the inner peripheral surface of the hub body are relatively displaced. Can be more effectively suppressed. Moreover, since the outer peripheral surface of the annular body and the inner peripheral surface of the hub body are joined by an adhesive, the positioning of the annular body including the internal gear in the axial direction is not affected.

  According to a fourth aspect of the present invention, in the motor built-in hub structure according to the first or third aspect, the side surface of the annular body and the side wall surface of the hub body are joined by the adhesive.

  In the invention according to claim 4, the side surface of the annular body and the side wall surface of the hub body are joined together by an adhesive, and it is more effective that the side surface of the annular body and the side wall surface of the hub body are relatively displaced. Can be suppressed. For example, in the structure in which the annular body is fixed to the side wall surface of the hub body only by a plurality of bolts, the side surface of the annular body may be deformed in a wave shape and the phenomenon of hitting the side wall surface of the hub body may occur. In the structure, it is possible to prevent or suppress the side surface of the annular body from being deformed into a wave shape and hitting the side wall surface of the hub body.

  The invention according to claim 5 is the motor built-in hub structure according to claim 1 or 2, wherein the inner peripheral surface of the hub body and the outer peripheral surface of the annular body are joined by the joining means, The outer peripheral surface of the annular body is constituted by a cylindrical portion extending in the axial direction of the annular body from the fixing surfaces of the plurality of fastening means of the annular body.

  In the invention according to claim 5, the outer peripheral surface of the annular body joined to the inner peripheral surface of the hub body is constituted by a cylindrical portion extending in the axial direction of the annular body from the fixing surfaces of the plurality of fastening means of the annular body. Therefore, the head portion of the fastening means can be stored inside the cylindrical portion. For this reason, the dimension of the thrust direction (axial direction) inside a hub body can be made more compact in the state which fixed the annular body to the hub body.

  According to a sixth aspect of the present invention, in the motor-integrated hub structure according to any one of the first to fifth aspects, the plurality of fastening means are arranged in the axial direction of the annular body.

  In the invention according to claim 6, the plurality of fastening means are arranged in the axial direction of the annular body. For example, the opposing portions of the outer peripheral surface of the annular body and the inner peripheral surface of the hub body are joined by the joining means. In this case, the directions of the fastening and fixing portion of the fastening means and the joint portion of the joining means are different. Therefore, when the annular body is fixed to the hub body, a fixing force can be obtained in the thrust direction (axial direction) and the radial direction (perpendicular to the axis).

  According to a seventh aspect of the present invention, in the bicycle according to the seventh aspect, the front wheel or the rear wheel is provided with the motor built-in hub structure according to any one of the first to sixth aspects.

  In the invention according to claim 7, since the motor built-in hub structure according to any one of claims 1 to 6 is provided on the front wheel or the rear wheel of the bicycle, a plurality of fastening means and joints are joined. The annular body and the hub body are firmly fixed by the means. Further, the relative displacement between the surface of the hub body and the surface of the annular body is suppressed by the joining means provided in the facing portion between the surface of the hub body and the surface of the annular body. For this reason, generation | occurrence | production of the noise by the shift | offset | difference between an annular body and a hub body can be suppressed.

  According to the motor built-in hub structure and the bicycle of the present invention, it is possible to suppress the generation of abnormal noise due to the deviation between the annular body having the internal gear and the hub body.

1 is a side view showing a bicycle to which a motor built-in hub structure according to a first embodiment of the present invention is applied. It is sectional drawing including a hub axis | shaft which shows the hub structure with a built-in motor which is 1st Embodiment of this invention. (A) is a side view from the hub axial direction which shows the cover part of the hub body used for the hub structure with a built-in motor shown in FIG. 2, (B) is sectional drawing which shows the cover part of a hub body (FIG. 3). (C) is a cross-sectional view taken along line 3B-3B), and (C) is a side view on the opposite side to (A) showing the cover portion of the hub body. (A) is a side view which shows the state which fixed the annular body used for the hub structure with a built-in motor shown in FIG. 2 to the cover part of a hub body, (B) is a side view which shows an annular body. It is sectional drawing which shows the motor built-in hub structure which is 2nd Embodiment of this invention. It is sectional drawing which shows the hub structure with a built-in motor which is 3rd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that an arrow UP appropriately shown in the drawing indicates the upper side of the bicycle.

[First Embodiment]
FIG. 1 shows a side view of an electrically assisted bicycle 10 as a bicycle to which the motor built-in hub structure according to the first embodiment of the present invention is applied.

  As shown in FIG. 1, the electrically assisted bicycle 10 includes a head pipe 12 disposed on the front side along the oblique vertical direction, and a seat pipe 14 disposed on the rear side of the head pipe 12 along the oblique vertical direction. A main pipe 16 that connects the head pipe 12 and the seat pipe 14 along the front-rear oblique direction, a motor-integrated hub unit 30 that is attached to the lower end of the front fork 18 that is connected to the lower portion of the head pipe 12, It has. The motor built-in hub unit 30 is applied with the motor built-in hub structure S1 (see FIG. 2) of the present embodiment, and is provided at the center of the front wheel 20.

  The electric assist bicycle 10 includes a chain stay 24 disposed on the rear side of the main pipe 16 and extending toward the center of the rear wheel 22, an upper end portion of the seat pipe 14, and a rear end portion of the chain stay 24. And a back hawk 26 that rotatably supports the rear wheel 22. A crank arm 28 provided with a pedal 28A is rotatably attached to the lower end of the main pipe 16.

  Further, a battery 32 and a controller 34 are mounted on the rear portion of the seat pipe 14. The electrically assisted bicycle 10 is provided with a sensor (not shown) for detecting the load on the pedal 28A at a location where the pedaling force of the pedal 28A acts. When the load on the pedal 28A reaches a certain value, the controller 34 energizes the motor 48 (see FIG. 2) of the motor-integrated hub unit 30 from the controller 34 connected to the battery 32.

  As shown in FIG. 2, the motor built-in hub unit 30 to which the motor built-in hub structure S1 is applied is a pair of left and right hub shafts 42 and 44 fixed to the lower end portion of the front fork 18 (see FIG. 1) as a vehicle body. A hub body 46 that is rotatable with respect to the hub shafts 42, 44, a motor 48 that is provided inside the hub body 46, and a housing 50 that is disposed inside the hub body 46 and supports the motor 48. And.

  The motor 48 includes a rotatable rotor 52 and a stator 54 that rotates the rotor 52. The rotor 52 is formed by laminating a plurality of circular metal plates 52A, and a rotation shaft 56 passes through the center of the circular metal plate 52A. In the present embodiment, the plurality of metal plates 52A are attached to the rotation shaft 56 by press-fitting the rotation shaft 56 into the central portion of the metal plate 52A. A plurality of permanent magnets 58 are provided in parallel to the rotation shaft 56 on the outer peripheral portion of the plurality of metal plates 52A, and S and N poles are arranged in the circumferential direction of the metal plate 52A.

  The stator 54 is formed by laminating a plurality of annular metal plates 54A. The stator 54 is fixed to the housing 50. The rotor 52 is disposed inside the stator 54 so as to be rotatable concentrically with the stator 54. More specifically, the housing 50 is configured as a pair of left and right, and includes a carrier 60 and a support body 62. The plurality of metal plates 54A constituting the stator 54 are sandwiched between the carrier 60 and the support body 62 from both sides in the axial direction of the stator 54, and tightened with a plurality of tightening bolts 64 penetrating the outer peripheral portion of the metal plate 54A. Are fixed to the carrier 60 and the support 62. The stator 54 is electrically connected to the controller 34 (see FIG. 1) via a power supply cable 66.

  The carrier 60 disposed on the left side in the width direction in FIG. 2 includes a notch 60A that is notched so as to increase the inner diameter at a position facing the metal plate 52A of the rotor 52. The outer ring of the bearing 68 is fitted into the notch 60 </ b> A of the carrier 60. The support body 62 disposed on the right side in the width direction in FIG. 2 includes a notch 62A that is notched so as to increase the inner diameter at a position facing the metal plate 52A of the rotor 52. The outer ring of the bearing 69 is fitted into the notch 62 </ b> A of the support body 62. Both ends in the axial direction of the rotary shaft 56 of the rotor 52 are rotatably supported by the bearings 68 and 69.

  In the present embodiment, the hub shaft 42 and the hub shaft 44 are separately disposed on both sides of the rotation shaft 56 in the axial direction. The hub shaft 42 and the hub shaft 44 are arranged coaxially with the rotation shaft 56. The housing 50 is attached to the hub shaft 44 on the right side in the width direction in FIG. 2, and a hub shaft support 82 described later configured integrally with the housing 50 is the hub shaft 42 on the left side in the width direction in FIG. 2. Is attached.

  As a speed reduction mechanism that decelerates the rotation of the rotor 52 that is a constituent member of the motor 48 and transmits it to the hub body 46 on the outer side of the carrier 60 arranged on the left side in the width direction in FIG. A reduction gear 80 is provided. The reduction gear 80 is provided inside the hub body 46. The reduction gear 80 includes a hub shaft support 82 that is formed integrally with the carrier 60 (housing 50). In the present embodiment, the hub shaft support 82 includes a plurality of (three in the present embodiment) leg portions extending from the outer peripheral portion of the substantially circular vertical wall portion, and a bolt is provided at the distal end side of each leg portion. It is fastened and fixed to the carrier 60 by 84. One end of the rotating shaft 56 in the axial direction extends outside the carrier 60.

  The reduction gear 80 includes a sun gear 86 formed at one end of the rotation shaft 56 in the axial direction, a plurality of (three in this embodiment) planetary gears 88 rotatably supported by the hub shaft support 82, It has. The planetary gear 88 includes a large gear 88B provided on the side of the carrier 60 in the axial direction of the shaft portion 88A, and a small gear 88C provided on the side opposite to the carrier 60 in the axial direction of the shaft portion 88A. . The large gear 88 </ b> B is meshed with the sun gear 86 of the rotation shaft 56.

  The hub body 46 surrounds the outer periphery of the motor 48 and the speed reducer 80, and has a substantially cup-shaped main body (hub body main body) 90 that is open on the left side (the side opposite to the motor 48) in FIG. And a cover portion (hub body cover portion) 92 that covers the opening side of the portion 90. The cover portion 92 is fastened and fixed to the main body portion 90 by bolts 94 at a plurality of locations. An opening 90 </ b> A is formed in the bottom surface portion of the main body 90, and the bearing 100 is interposed between the inner peripheral portion of the opening 90 </ b> A of the main body 90 and the support body 62. The support body 62 is attached to a hub shaft 44 disposed on the right side in the width direction in FIG.

  An opening 92A is formed at the center of the cover 92, and a bearing 102 is interposed between the inner periphery of the opening 92A and the hub shaft 42 disposed on the left side in the width direction in FIG. . The hub body 46 is rotatably supported by the bearings 102 and 100 with respect to the left and right hub shafts 42 and 44.

  The reduction gear 80 is provided with an annular body 96 having an internal gear 96A that meshes with a small gear 88C of the planetary gear 88 on the inner peripheral side (see FIG. 4). The annular body 96 is fastened and fixed to the outer peripheral portion inside the cover portion 92 by a plurality of bolts 98 as fastening means. Furthermore, the outer peripheral surface of the annular body 96 and the inner peripheral surface of the cover portion 92 are joined together by an adhesive 130 as a joining means. The structure for fixing the annular body 96 to the cover portion 92 will be described in detail later.

  The motor built-in hub unit 30 includes a push nut 120 attached to the rotary shaft 56 so as to be positioned on one axial side surface (right side surface in FIG. 2) of the rotor 52 (metal plate 52A). Since the push nut 120 is positioned on one side surface of the rotor 52 (metal plate 52A) in the axial direction, the position of one side of the rotor 52 in the axial direction with respect to the rotation shaft 56 is regulated, and the rotor 52 (metal plate 52A) rotates. A positional shift to the right in the axial direction of the shaft 56 is suppressed.

  Although not shown, the push nut 120 includes a ring portion and a plurality of claw portions that protrude radially inward from the ring portion in a direction intersecting the radial direction. In the push nut 120, the ring portion is positioned on one side surface in the axial direction of the rotor 52 (metal plate 52 </ b> A), and the plurality of claw portions hold the rotating shaft 56, so that an arbitrary position in the axial direction of the rotating shaft 56. The structure can be fixed with.

  The motor built-in hub unit 30 includes a spacer 122 attached to the rotary shaft 56 so as to be positioned on the other axial side surface (the left side surface in FIG. 2) of the rotor 52 (metal plate 52A). In the present embodiment, the outer ring of the bearing 68 is fitted into the notch 60A of the carrier 60, and in this state, the other side surface (in FIG. 2) of the bearing 68 and the rotor 52 (metal plate 52A) in the axial direction. A spacer 122 is interposed between the left side surface and the left side surface. The spacer 122 is a washer that is extrapolated to the rotary shaft 56. The spacer 122 regulates the position of the other side of the rotor 52 in the axial direction with respect to the rotating shaft 56 and secures a clearance between the rotor 52 and the bearing 68.

  A small-diameter portion with a reduced outer diameter is formed at one end portion in the axial direction of the rotating shaft 56 (end portion outside the push nut 120 in the axial direction), and a bearing 69 is provided in the small-diameter portion. ing. The rotating shaft 56 is rotatably supported by the housing 50 via bearings 68 and 69 on both axial sides. The motor built-in hub unit 30 is provided with a snap ring 124 that restricts the axial position of the rotary shaft 56 with respect to the bearing 68 on the other end side in the axial direction of the rotary shaft 56 (the side opposite to the push nut 120). ing. In the present embodiment, a groove is formed along the circumferential direction on the inner side in the axial direction of the sun gear 86 of the rotating shaft 56, and the snap ring 124 is engaged with the groove. The snap ring 124 is made of, for example, a C-shaped member, and is fixed to the groove portion by expanding in the radial direction and fitting into the groove portion. The snap ring 124 suppresses the positional deviation in the axial direction of the rotary shaft 56 with respect to the bearing 68 and the housing 50.

  An opening 62B through which the shaft portion 44A of one (right side in FIG. 2) hub shaft 44 passes is formed in the support body 62 constituting the housing 50, and is adjacent to the inner side in the axial direction than the opening 62B. A recessed portion 62 </ b> C that is recessed outward in the radial direction is formed at the position to be operated. A protruding portion 44B protruding outward in the radial direction is formed at one end of the hub shaft 44 in the axial direction (end facing the rotating shaft 56), and the protruding portion 44B is a recessed portion 62C of the support body 62. Is engaged. A threaded portion 44C is formed on the other end portion side of the hub shaft 44 in the axial direction (the side opposite to the protruding portion 44B).

  A cylindrical portion 104 that is extrapolated to the hub shaft 44 is provided on the outer side in the axial direction of the hub shaft 44 with respect to the support body 62, so that the side portion of the cylindrical portion 104 contacts the side portion of the support body 62. Is arranged. A nut 126 that restricts the axial position of the hub shaft 44 relative to the support body 62 (housing 50) is screwed into the screw portion 44C of the hub shaft 44. The hub shaft 44 is fixed to the support body 62 by the nut 126 being tightened to the support body 62 side via the cylindrical portion 104. That is, the nut 126 is tightened to the support body 62 side via the tubular portion 104 in a state where the protruding portion 44B of the hub shaft 44 is engaged with the recess portion 62C of the support body 62, thereby supporting the hub shaft 44. The positional deviation in the axial direction with respect to the body 62 (housing 50) is suppressed.

  Further, the hub shaft support 82 fixed integrally with the housing 50 is formed with an opening 82A through which the shaft portion 42A of the other (left side in FIG. 2) hub shaft 42 penetrates. A recessed portion 82B that is recessed outward in the radial direction is formed at a position adjacent to the inner side in the axial direction from 82A. A projecting portion 42B projecting outward in the radial direction is formed at one end portion in the axial direction of the hub shaft 42 (the end portion facing the rotation shaft 56), and the projecting portion 42B is a depression of the hub shaft support 82. It is engaged with the part 82B. A screw portion 42C is formed on the other end portion side of the hub shaft 42 in the axial direction (the side opposite to the protruding portion 42B).

  A cylindrical portion 108 that is externally inserted into the hub shaft 42 is provided outside the hub shaft support 82 in the axial direction of the hub shaft 42. A nut 126 that restricts the axial position of the hub shaft 42 with respect to the hub shaft support 82 (housing 50) is screwed into the screw portion 42C of the hub shaft 42. The hub shaft 42 is fixed to the hub shaft support 82 and the housing 50 by tightening the nut 126 to the hub shaft support 82 via the cylindrical portion 108 and the bearing 102. That is, the nut 126 is tightened to the hub shaft support 82 side via the cylindrical portion 108 and the bearing 102 in a state where the protrusion 42B of the hub shaft 42 is engaged with the recess 82B of the hub shaft support 82. Thus, the positional deviation of the hub shaft 42 in the axial direction with respect to the hub shaft support 82 and the housing 50 is suppressed.

  The hub shaft 42 and the hub shaft 44 are fixed to the lower end portion of the front fork 18 (see FIG. 1) of the electric assist bicycle 10.

  On both sides in the width direction of the outer peripheral portion of the main body 90 of the hub body 46, peripheral wall portions 90B are formed along the circumferential direction. Although not shown, the spoke 21 (see FIG. 1) provided on the front wheel 20 of the electrically assisted bicycle 10 is attached to the peripheral wall portion 90B.

  The electrically assisted bicycle 10 (see FIG. 1) has a regenerative function that generates and charges using the rotational force of the front wheels 20 during coasting such as downhill, and charges the battery 32 with the electric power generated during braking. This increases the distance that can be supported. Here, the regenerative function refers to a motor 48 (see FIG. 2) as an electric motor that outputs as a driving rotational force, and reversely inputs a shaft rotation to act as a generator to convert kinetic energy into electrical energy. It means converting and collecting.

Next, a structure for fixing the annular body 96 to the cover portion 92 of the hub body 46 will be described.
As shown in FIGS. 3 (A) to 3 (C), the cover portion 92 includes a side wall portion (vertical wall portion) 92B which is disposed substantially along the vertical direction and has an opening 92A formed in the center portion, and a side wall. A cylindrical portion 92C extending in the axial direction from the peripheral portion of the portion 92B toward the main body 90 (see FIG. 2). Furthermore, on the inner side of the side wall portion 92B (the reduction gear 80 side shown in FIG. 2), an inner cylindrical portion 92D disposed substantially concentrically with the cylindrical portion 92C on the radial inner side of the cylindrical portion 92C, and the cylindrical portion 92C and the inner side A plurality of ribs 92E that connect the cylindrical portion 92D in the radial direction are provided.

  A part of the plurality of ribs 92E is provided with a mounting portion 92F having a width larger than the width of the rib 92E at a position adjacent to the inner cylindrical portion 92D. The attachment portion 92F is formed in a substantially cylindrical shape. A plurality (6 in the present embodiment) of the attachment portions 92F are arranged at substantially equal intervals along the circumferential direction of the cover portion 92. A screw hole 93 into which the shaft portion 98B of the bolt 98 is screwed is formed in the attachment portion 92F along the axial direction of the hub body 46 (see FIG. 2). The cylindrical portion 92C protrudes toward the main body 90 (see FIG. 2) in the axial direction from the rib 92E and the attachment portion 92F. Further, the cover portion 92 includes a plurality of (three in this embodiment) protruding pieces 92G protruding outward in the radial direction from the outer peripheral portion of the side wall portion 92B. The protruding piece 92G is formed with a through hole 95 through which a bolt 94 fastened and fixed to the main body 90 is inserted (see FIG. 2).

  As shown in FIG. 4B, the annular body 96 includes a side wall portion (vertical wall portion) 96B disposed at a position facing the plurality of ribs 92E (see FIG. 3C) of the cover portion 92, And a cylindrical portion 96C extending in the axial direction from the peripheral edge of the side wall portion 96B toward the main body 90 (see FIG. 2). Further, the annular body 96 includes an inner cylindrical portion 96D that extends along the axial direction from the inner peripheral portion of the side wall portion 96B to the main body portion 90 side (see FIG. 2) and is disposed substantially concentrically with the cylindrical portion 96C. And a plurality of ribs 96E that connect the portion 96C and the inner cylindrical portion 96D in the radial direction. In the annular body 96, an internal gear 96A is formed on the inner peripheral portion of the inner cylindrical portion 96D.

  A substantially cylindrical mounting portion 96F having a width larger than the width of the rib 96E is provided at an intermediate portion (a position close to the inner cylindrical portion 96D) of some of the ribs 96E. A plurality (6 in the present embodiment) of the attachment portions 96F are arranged at substantially equal intervals along the circumferential direction of the annular body 96. A through hole 97 into which the shaft portion 98B of the bolt 98 is inserted is formed in the mounting portion 96F along the axial direction of the hub body 46 (see FIG. 2). The cylindrical portion 96C protrudes toward the main body portion 90 in the axial direction from the rib 96E and the attachment portion 96F. The plurality of through holes 97 of the annular body 96 are provided so that the positions in the axial direction match the plurality of screw holes 93 of the cover portion 92.

  As shown in FIG. 4A, the outer diameter of the cylindrical portion 96C of the annular body 96 is formed to be slightly smaller than the inner diameter of the cylindrical portion 92C of the cover portion 92, and the cylindrical portion 96C of the annular body 96 is covered by the cover. It is fitted inside the cylindrical portion 92C of the portion 92. In this state, the outer peripheral surface of the cylindrical portion 96C and the inner peripheral surface of the cylindrical portion 92C, which are opposed portions of the cylindrical portion 96C of the annular body 96 and the cylindrical portion 92C of the cover portion 92, are bonded by an adhesive (joining means) 130. They are joined (see FIG. 2). In the present embodiment, the cylindrical portion 96 </ b> C of the annular body 96 is fitted inside the cylindrical portion 92 </ b> C of the cover portion 92 with the adhesive 130 applied to almost the entire inner peripheral surface of the cylindrical portion 92 </ b> C of the cover portion 92. Yes. Thereby, the outer peripheral surface of the cylindrical portion 96C and the inner peripheral surface of the cylindrical portion 92C are joined substantially continuously in the circumferential direction by the adhesive 130.

  Further, the shaft portion 98B of the bolt (fastening means) 98 is inserted into the through hole 97 of the annular body 96 and screwed into the screw hole 93 of the cover portion 92, so that the side wall portion 96B of the annular body 96 has a plurality of bolts 98. Thus, the cover 92 is fastened and fixed to the side wall 92B. The plurality of bolts 98 are arranged in the axial direction of the annular body 96 (see FIG. 2).

  As shown in FIG. 2, the outer peripheral surface of the annular body 96 joined to the inner peripheral surface of the cover portion 92 is formed by a cylindrical portion 96 </ b> C extending in the axial direction of the annular body 96 from the fixing surface of the bolt 98 of the annular body 96. It is configured. Accordingly, the heads 98A of the plurality of bolts 98 are housed inside the cylindrical portion 96C in a state where the annular body 96 is fastened and fixed to the cover portion 92 by the plurality of bolts 98.

  Next, the operation and effect of the motor built-in hub unit 30 to which the motor built-in hub structure S1 of the present embodiment is applied will be described.

  As shown in FIG. 1, when a load of a certain value or more acts on the depression of the pedal 28A of the electric assist bicycle 10, the controller 34 energizes the stator 54 of the motor 48 from the battery 32 through the power supply cable 66 (FIG. 2). reference). As a result, the rotor 52 rotates. Due to the rotation of the rotor 52, the sun gear 86 provided at one axial end of the rotation shaft 56 rotates, and the planetary gear 88 meshed with the sun gear 86 rotates at a fixed position. The rotation of the planetary gear 88 is transmitted at a reduced speed to the hub body 46 via the inner gear 96A of the annular body 96, and rotationally drives the front wheels 20 of the electrically assisted bicycle 10. In such a motor-integrated hub unit 30, the electric assist bicycle 10 can be caused to travel by reducing the stepping force of the pedal 28 </ b> A by the electric rotation of the rotor 52.

  Generally, in a motor-equipped hub unit with a regenerative function, the torque received by the internal gear of the annular body when switching between the normal driving state and the regenerative state using the rotational force of the wheel during coasting such as downhill The direction of changes. For example, in a structure in which the annular body is fixed to the side wall portion of the hub body only by a plurality of bolts, the direction of the torque received by the internal gear of the annular body is changed, thereby causing a deviation between the annular body and the hub body. Arise. That is, dynamic friction between the outer peripheral surface of the annular body and the inner peripheral surface of the hub body and contact with other components occur, and abnormal noise may occur at that time.

  In the motor built-in hub unit 30 of the present embodiment, as shown in FIGS. 2 and 4, the side wall portion 96 </ b> B of the annular body 96 constitutes the hub body 46 by a plurality of (six in this embodiment) bolts 98. The cover 92 is fastened and fixed to the side wall 92B. At the same time, in the motor built-in hub unit 30, the cylindrical portion 96 C of the annular body 96 is fitted inside the cylindrical portion 92 C of the cover portion 92, and the outer peripheral surface of the cylindrical portion 96 C of the annular body 96 and the cover portion 92. The inner peripheral surface of the cylindrical portion 92 </ b> C is joined by an adhesive 130. In such a motor-integrated hub unit 30, the annular body 96 and the cover portion 92 (hub body 46) are firmly fixed by the plurality of bolts 98 and the adhesive 130, and the cylindrical portion 96 </ b> C is fixed by the adhesive 130. It is possible to suppress relative displacement between the outer peripheral surface and the inner peripheral surface of the cylindrical portion 92C. For this reason, generation | occurrence | production of the noise by the shift | offset | difference between the annular body 96 and the cover part 92 can be suppressed.

  Further, in the motor built-in hub unit 30, the fixing force can be dispersed by the fastening and fixing portions by the plurality of bolts 98 and the joint portions by the adhesive 130, so that small-sized bolts 98 can be used. It is possible to reduce the size and weight.

  Further, in the motor built-in hub unit 30, since the outer peripheral surface of the cylindrical portion 96C of the annular body 96 and the inner peripheral surface of the cylindrical portion 92C of the cover portion 92 are joined by the adhesive 130, the internal gear 96A is provided. The positioning of the annular body 96 in the axial direction is not affected. For this reason, the annular body 96 can be easily assembled to the cover portion 92.

  In the motor built-in hub unit 30, the outer peripheral surface of the annular body 96 bonded to the inner peripheral surface of the cover portion 92 is a cylinder extending in the axial direction of the annular body 96 from the fixing surfaces of the plurality of bolts 98 of the annular body 96. The unit 96C is configured. Thereby, the head portions 98A of the plurality of bolts 98 can be accommodated in the cylindrical portion 96C. For this reason, in a state where the annular body 96 is fixed to the cover portion 92 with the plurality of bolts 98, the dimension in the thrust direction (axial direction) inside the cover portion 92 can be made more compact.

  Further, as shown in FIGS. 2 and 4, in a state where the side wall portion 96B of the annular body 96 and the side wall portion 92B of the cover portion 92 are fastened and fixed by the plurality of bolts 98, the plurality of bolts 98 are It is arranged in 96 axial directions. For this reason, when the annular body 96 is fixed to the cover portion 92, the direction of the fastening fixing portion by the plurality of bolts 98 and the joining portion by the adhesive 130 are different, and the thrust direction (axial direction) and the radial direction (relative to the axis) A fixing force can be obtained in the vertical direction).

[Second Embodiment]
Next, the motor built-in hub structure which is 2nd Embodiment of this invention is demonstrated. In addition, the same code | symbol is attached | subjected to the member same as 1st Embodiment, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 5, in the motor built-in hub unit 150 to which the motor built-in hub structure S2 of the present embodiment is applied, the cover portion 152 constituting the hub body 46 has an inner surface facing the annular body 96 in the side wall portion 92B. A side surface (side wall surface) 152A is formed in a substantially planar shape. Further, the outer side surface (the surface facing the inner side surface 152A) of the side wall portion 96B of the annular body 96 is also formed in a substantially flat shape. The side wall portion 96B of the annular body 96 is fastened and fixed to the side wall portion 92B of the cover portion 152 by a plurality of bolts 98 (six in this embodiment). Further, the outer peripheral surface of the cylindrical portion 96C of the annular body 96 and the inner peripheral surface of the cylindrical portion 92C of the cover portion 152 are joined by an adhesive 154 as a joining means, and the outer side surface of the side wall portion 96B of the annular body 96. (Side surface) and the inner side surface 152A of the side wall portion 92B of the cover portion 152 are joined by an adhesive 154.

  In such a motor built-in hub unit 150, the annular body 96 and the cover portion 152 (hub body 46) are more firmly fixed by a plurality of bolts 98 and an adhesive 154. Further, the adhesive 154 suppresses the relative displacement between the outer peripheral surface of the cylindrical portion 96C of the annular body 96 and the inner peripheral surface of the cylindrical portion 92C of the cover portion 152, and also the side wall portion 96B of the annular body 96. Relative displacement between the outer side surface and the inner side surface 152A of the side wall portion 92B of the cover portion 152 is suppressed. For this reason, generation | occurrence | production of the noise by the shift | offset | difference between the annular body 96 and the cover part 152 can be suppressed.

  For example, in a structure in which the annular body is fixed to the side wall portion of the cover portion (hub body) with only a plurality of bolts, the side wall portion of the annular body is deformed in a wave shape and the side wall portion of the cover portion (hub body) is hit. May occur. On the other hand, in the motor built-in hub unit 150 of the present embodiment, the outer side surface of the side wall portion 96B of the annular body 96 and the inner side surface 152A of the side wall portion 92B of the cover portion 152 are joined by the adhesive 154. It is possible to prevent or suppress the outer surface of the side wall portion 96B of the annular body 96 from being deformed into a wave shape and hitting the side wall portion 92B of the cover portion 152.

[Third Embodiment]
Next, a motor built-in hub structure according to a third embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the member same as 1st and 2nd embodiment, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 6, in the motor built-in hub unit 160 to which the motor built-in hub structure S3 according to the present embodiment is applied, the cover portion 162 constituting the hub body 46 is made of metal. On the inner peripheral surface of the cylindrical portion 92C of the cover portion 162, an engaging portion 164 is provided as a joining means composed of a large number of irregularities formed along the axial direction by knurling. The annular body 166 provided with the internal gear 96A is made of resin. The outer diameter of the cylindrical portion 96C of the annular body 166 is slightly larger than the inner diameter of the cylindrical portion 92C (engagement portion 164) of the cover portion 162. The outer peripheral surface of the cylindrical portion 96C of the annular body 166 has a substantially uniform and smooth surface before being assembled inside the cylindrical portion 92C of the cover portion 162. The cylindrical portion 96C of the annular body 166 is press-fitted inside the cylindrical portion 92C of the cover portion 162, so that the outer peripheral surface of the cylindrical portion 96C of the annular body 166 is engaged with the engaging portion 164 of the cylindrical portion 92C of the cover portion 162. A large number of projections and depressions are formed. As a result, the engaging portion 164 of the cylindrical portion 92C of the cover portion 162 and the numerous irregularities of the cylindrical portion 96C of the annular body 166 are engaged.

  In the motor built-in hub unit 160, the side wall portion 96 </ b> B of the annular body 166 is fastened and fixed to the side wall portion 92 </ b> B of the cover portion 162 by a plurality of (six in this embodiment) bolts 98.

  In such a motor built-in hub unit 160, a joint portion formed by engagement of a fastening and fixing portion with a plurality of bolts 98 and an outer peripheral surface of the cylindrical portion 96 </ b> C of the annular portion 166 and the engaging portion 164 of the cylindrical portion 92 </ b> C of the cover portion 162. Thereby, the annular body 166 and the cover part 162 (hub body 46) are more firmly fixed. Further, the outer peripheral surface of the cylindrical portion 96C of the annular body 166 and the cylinder of the cover portion 162 are joined by a joint portion by engagement between the engaging portion 164 of the cylindrical portion 92C of the cover portion 162 and the outer peripheral surface of the cylindrical portion 96C of the annular body 166. It is possible to suppress relative displacement from the inner peripheral surface of the portion 92C. For this reason, generation | occurrence | production of the noise by the shift | offset | difference between the annular body 96 and the cover part 162 can be suppressed.

In addition, it replaces with the structure which engages with the engaging part 164 of the cover part 162 of the 3rd Embodiment, and the outer peripheral surface of the annular body 166 by press-fitting, and the inner peripheral surface of a cover part and the outer peripheral surface of an annular body are made into another You may engage by a joining means. For example, a plurality of substantially V-shaped notches are provided on the outer peripheral surface of the annular body, and a plurality of hole portions are provided in the vicinity of the boundary with the outer peripheral surface of the annular body in the cover portion (hub body). The tapping screw may be engaged with the cutout portion by screwing each into the hole portion. Even in this configuration, it is possible to suppress relative displacement between the outer peripheral surface of the annular body and the inner peripheral surface of the cover portion due to the engagement between the plurality of tapping screws and the notch portion.
Further, for example, a configuration may be adopted in which a plurality of concave notches are provided on the outer peripheral surface of the annular body, and the screws are engaged with the notches by tightening a plurality of screws along the radial direction on the cover. Even in this configuration, it is possible to suppress relative displacement between the outer peripheral surface of the annular body and the inner peripheral surface of the cover portion due to the engagement between the plurality of screws and the notch portions.

  Further, the present invention is not limited to the configuration in which the surface of the annular body is engaged with the engaging portion provided on the surface of the hub body, and the hub is provided on the engaging portion provided on the surface of the annular body. The structure by which the surface of a body is engaged may be sufficient.

  In the motor-embedded hub unit 150 of the second embodiment, the cylindrical portion 96C of the annular body 96 and the cylindrical portion 92C of the cover portion 152 are fixed by the adhesive 154, and the side wall portion 96B and the cover portion of the annular body 96 are fixed. The inner side surface 152A of the side wall portion 92B of the 152 is fixed by the adhesive 154, but the present invention is not limited to this. For example, only the side wall part 96B of the annular body 96 and the inner side surface 152A of the side wall part 92B of the cover part 152 may be bonded by the adhesive 154. Even in this configuration, the deviation between the opposed surfaces of the annular body 96 and the cover portion 152 is suppressed, and the generation of abnormal noise due to the displacement between the annular body 96 and the cover portion 152 can be suppressed.

  Further, in the motor built-in hub unit 30 according to the present embodiment, the rotating shaft 56 and the left and right hub shafts 42 and 44 are divided in the axial direction, but the present invention is not limited to this configuration. Absent.

  Furthermore, the motor built-in hub unit 30 of the present embodiment is provided on the front wheel 20 of the electrically assisted bicycle 10, but the present invention is not limited to this configuration. For example, a motor-integrated hub unit may be provided on the rear wheel of the electrically assisted bicycle.

10 Electric assist bicycle (bicycle)
18 Front Hawk (Body)
20 Front Wheel 30 Motor Built-In Hub Unit 42 Hub Shaft 44 Hub Shaft 46 Hub Body 48 Motor 80 Reduction Device (Deceleration Mechanism)
88 planetary gear 92 cover (hub body)
92B Side wall (side wall surface)
92C Cylindrical part (inner peripheral surface)
96 Ring body 96A Internal gear 96B Side wall (side surface)
96C Cylindrical part (outer peripheral surface)
98 bolts (fastening means)
130 Adhesive (joining means)
150 Motor-equipped hub unit 152 Cover (hub body)
152A Inner side surface (side wall surface)
154 Adhesive (joining means)
160 Motor built-in hub unit 162 Cover (hub body)
164 Engagement part (joining means)
166 Ring body S1 Motor built-in hub structure S2 Motor built-in hub structure S3 Motor built-in hub structure

Claims (7)

A hub body rotatably provided with respect to a hub shaft fixed to the vehicle body;
A motor provided inside the hub body for rotating the hub body;
A speed reduction mechanism that is provided inside the hub body and decelerates the rotation of the motor and transmits it to the hub body;
An annular body provided with an internal gear that is provided in the speed reduction mechanism and meshes with a planetary gear on the inner peripheral side;
A plurality of fastening means for fastening and fixing the annular body to the hub body;
A joining means that is provided at a facing portion where the surface of the hub body and the surface of the annular body are opposed to each other so that the surface of the hub body and the surface of the annular body are not relatively displaced from each other; ,
The motor-integrated hub structure, wherein the joining means is an adhesive that is applied between the surface of the hub body and the surface of the annular body, and joins the surface of the hub body and the surface of the annular body. A hub body rotatably provided with respect to a hub shaft fixed to the vehicle body;
A motor provided inside the hub body for rotating the hub body;
A speed reduction mechanism that is provided inside the hub body and decelerates the rotation of the motor and transmits it to the hub body;
An annular body provided with an internal gear that is provided in the speed reduction mechanism and meshes with a planetary gear on the inner peripheral side;
A plurality of fastening means for fastening and fixing the annular body to the hub body;
A joining means that is provided at a facing portion where the surface of the hub body and the surface of the annular body are opposed to each other so that the surface of the hub body and the surface of the annular body are not relatively displaced from each other; ,
The joining means is configured such that the other of the surface of the hub body and the surface of the annular body is engaged with an engaging portion provided on one of the surface of the hub body and the surface of the annular body. Motor built-in hub structure.   The hub structure with a built-in motor according to claim 1, wherein an outer peripheral surface of the annular body and an inner peripheral surface of the hub body are joined by the adhesive.   The hub structure with a built-in motor according to claim 1 or 3, wherein a side surface of the annular body and a side wall surface of the hub body are joined by the adhesive. The inner peripheral surface of the hub body and the outer peripheral surface of the annular body are joined by the joining means,
The hub structure with a built-in motor according to claim 1 or 2, wherein an outer peripheral surface of the annular body is configured by a cylindrical portion extending in an axial direction of the annular body from a fixing surface of the plurality of fastening means of the annular body. .   The motor built-in hub structure according to any one of claims 1 to 5, wherein the plurality of fastening means are arranged in an axial direction of the annular body.   A bicycle in which the front wheel or the rear wheel is provided with the motor-integrated hub structure according to any one of claims 1 to 6.