JP2014111396A - Electric hub device and electric bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric hub device and an electric bicycle capable of preventing generation of backlash between a whirl-stop member and a motor housing, and preventing the motor housing from being damaged even if a motor is used to switch over between an auxiliary drive force generation operation and a regenerative operation.SOLUTION: An electric hub device 20 includes: a hub shaft 21 fixed to a rear claw 12 of a frame tip end; a hub body 23 rotatable about this hub shaft 21; and a motor 24 provided on this hub body 23, and rotating the hub body 23. The electric hub device 20 includes: a housing body 36 of a motor housing 32 to which a stator 33 of the motor 24 is fixed and with which the hub shaft 21 is engaged; and a whirl-stop member 70 externally fitted into the hub shaft 21, and engaged with the rear claw 12. The whirl-stop member 70 is fixed to the housing body 36 by a screw 72 in a state in which the whirl-stop member 70 and the housing body 36 contact each other.

Description

  The present invention relates to an electric hub device and an electric bicycle including the electric hub device.

  As a conventional electric hub device provided at the center of the wheel of an electric bicycle, for example, as shown in FIG. 9, a pair of right and left hub shafts 81 and 82 and rotation with respect to these hub shafts 81 and 82 are rotated. Some have a free hub body 83 and a motor 84 that is disposed inside the hub body 83 and rotates the hub body 83. In FIG. 9, 85 is a spoke, 86 is a rotating shaft of a motor 84, and the rotating shaft 86 is disposed between the left and right hub shafts 81 and 82.

  The rotor 88 and the rotation shaft 86 of the motor 84 are interlocked with the hub body 83 via a speed reduction mechanism 87 including a planetary gear mechanism provided in the hub body 83. The stator 84 of the motor 84 and a part of the motor housing 90 that holds the stator 89 protrude from the inside of the hub body 83 together with the one hub shaft 81, and include a power line, a signal line, and the like connected to the motor 84. The connection wiring 84 a is taken out through a hole 90 a formed in the motor housing 90.

  In addition, hexagonal engaging portions 81a and 82a are formed at the tip portions of the hub shafts 81 and 82 protruding into the hub body 83, and these engaging portions 81a and 82a are The engagement hole 90 b such as a hexagonal hole formed in the motor housing 90 and the engagement hole 99 a of the holding frame 99 such as a hexagonal hole provided in the speed reduction mechanism 87 are fitted. As a result, the motor housing 90 and the holding frame 99 are assembled in a state of being regulated so as not to rotate around the shaft center with respect to the hub shafts 81 and 82.

  The hub shafts 81 and 82 are fixed to the end portion of the frame 92 of the electric bicycle in a state in which the hub shafts 81 and 82 are regulated so as not to rotate via rotation preventing members 93 and 94 and nuts 95 and 96. Note that reference numeral 98 in FIG. 9 denotes a resin spacer. As shown in FIG. 10 (a), a groove 92b opened on one side is formed at the tip of the frame 92 to form a claw portion 92a having a bifurcated shape, and a detent member 93 is formed on the claw portion 92a. , 94 are formed in the protrusions 93a and 94a. As a result, the rotation preventing members 93 and 94 are restricted from rotating in the circumferential direction of the hub shafts 81 and 82. Further, as shown in FIG. 10 (b), a part where the hub shafts 81 and 82 and the anti-rotation members 93 and 94 are fitted has a part of a round cross section removed in a plane shape, and the cross section is a so-called “D”. C-shaped chamfered portions 81c, 82c, 93c, and 94c are formed, so that the hub shafts 81 and 82 are restricted from rotating in the circumferential direction via the anti-rotation members 93 and 94.

  As shown in FIG. 9, the connection wiring 84 a of the motor 84 is taken out from the vicinity of the hub shaft 81 of the motor housing 90. As shown in FIGS. 9 and 10B, the rotation preventing member 93 disposed on the side where the connection wiring 84a is taken out has a curved recess 93b that bends while guiding the connection wiring 84a. The connection wiring 84a is arranged so as not to interfere with the frame 92 while being guided by a part of the curved recess 93b.

  Such an electric hub device 80 is disposed, for example, at the center of the front wheel. In this case, both hub shafts 81 and 82 are provided at the front end (lower end) of the front fork as the claw 92a of the frame 92. It is attached. In some cases, the electric hub device 80 may be provided on the rear wheel. In this case, both hub shafts 81 and 82 are attached to the front end portion (rear end portion) of the chain stay as the claw portion 92a of the frame 92. .

  In such a configuration, when an auxiliary driving force is applied, the rotating shaft 86 rotates together with the rotor 88 of the motor 84, whereby the hub body 83 is decelerated via the speed reducing mechanism 87 and the hub body 83 is connected to the hub shafts 81 and 82. Rotate around the axis. Thereby, the wheel provided with the electric hub device 80 is rotationally driven by the auxiliary power of the motor 84. Further, when the rotor 88 of the motor 84 rotates, the motor housing 90 to which the stator 89 of the motor 84 is attached receives a reaction force of the rotating force of the rotor 88. That is, if the stator 89 of the motor 84 is not securely fixed, the rotational force of the rotor 88 is reduced, and the auxiliary driving force is also reduced. Here, the reaction force of the rotating force of the rotor 88 is caused by the engaging portion 81a (see FIG. 9) of the hub shaft 81 fitted in the engaging hole 90b of the motor housing 90 or the chamfered portion 81c of the hub shaft 81. The claw portion 93c of the anti-rotation member 93 that fits in and the claw portion 92a of the frame 97 that engages the projection 93a of the anti-rotation member 93 (see FIGS. 10A and 10B).

  The electric hub device 80 as described above is described in, for example, Patent Document 1 and Patent Document 2 below. In recent years, it is also widely known that the motor of the electric hub device is used by switching between an auxiliary driving force generating operation for applying auxiliary driving force to the wheel and a regenerative operation for generating electric power by the force from the wheel. It has been.

JP 2006-96059 A JP2009-12542

  However, in the conventional electric hub device 80 shown in FIGS. 9 and 10A and 10B, the hub shafts 81 and 82 and the rotation preventing members 93 and 94 are mutually connected by chamfered portions 81c, 82c, 93c, and 94c. Since it is only engaged, rattling occurs between the anti-rotation members 93 and 94, the hub shafts 81 and 82, the motor housing 90 and the holding frame 99 when the motor 84 is driven (a gap is generated). In particular, there has been a problem that rattling occurs between the motor housing 90 and the hub shaft 81 that are easily subjected to the force of the motor 84 (moves excessively with a gap).

  Further, due to this rattling, the force concentrates on the engagement hole 90b of the motor housing 90 in which the engagement portion 81a of the hub shaft 81 is fitted, and when the electric hub device 80 is used for a long period of time, etc. There is a possibility that the engagement hole 90b of the motor housing 90 may be damaged due to deformation. In particular, when the motor 84 of the electric hub device 80 is used by switching between the auxiliary driving force generation operation and the regenerative operation, the frequency at which the force acts on the engagement hole 90b of the motor housing 90 increases. Or the acting force may increase, the possibility that the engaging hole 90b of the motor housing 90 is damaged due to deformation or the like increases.

  In addition, since the motor 84 of the electric hub device 80 generates a lot of heat during driving, there is a problem that it is difficult to dissipate the heat well at this time. In particular, when the motor 84 of the electric hub device 80 is used by switching between the operation for generating the auxiliary driving force and the regenerative operation, the amount of heat generation also increases, so this problem can be dealt with satisfactorily. It was difficult.

  The present invention solves the above-mentioned problems and problems, and can prevent rattling between the rotation prevention member and the motor housing. For example, the motor is switched between the auxiliary driving force generation operation and the regenerative operation. It is an object of the present invention to provide an electric hub device and an electric bicycle that can prevent the motor housing from being damaged even when used, and can dissipate the heat of the motor to the outside. is there.

  In order to solve the above-described problems and problems, an electric hub device of the present invention is provided with a hub shaft fixed to a frame, a hub body rotatable with respect to the hub shaft, and the hub body. An electric hub device having a motor for rotating the hub body, the motor housing having the stator fixed to the motor and the hub shaft engaged with the motor housing, and being externally fitted to the hub shaft and engaged with the frame. An anti-rotation member attached to the hub shaft while being restricted from rotating about the axis of the hub shaft, and the anti-rotation member and the motor housing are fixed by screws in a state of contacting each other. Features.

  In addition, when the motor is switched between an auxiliary driving force generation operation that applies auxiliary driving force to the wheel and a regenerative operation that generates electric power by the force from the wheel, or the hub axle is divided into left and right It is particularly suitable when a rotating shaft that rotates coaxially with the hub shaft is provided between the hub shafts. Further, this electric hub device is preferably used for an electric bicycle.

  With this configuration, since the rotation preventing member and the motor housing are fixed by screws in a state where they are in contact with each other, it is possible to prevent rattling between the rotation preventing member and the motor housing. Further, since the detent member engaged with the frame is directly fixed to the motor housing, the force acting on the engaging portion between the hub shaft and the motor housing can be reduced, for example, the motor can assist. Even when used by switching between the driving force generating operation and the regenerative operation, the motor housing can be prevented from being damaged. In addition, since the heat acting on the motor housing is directly transmitted to the rotation preventing member, the heat of the motor can be dissipated well to the outside.

  Further, the electric hub device of the present invention is a wire take-out for guiding the connection wiring connected to the motor to the outside in the position where the screw does not overlap with the screw insertion hole portion through which the screw is inserted in the anti-rotation member in a side view. A notch is formed. With this configuration, the anti-rotation member can be fixed to the motor housing without hindrance while guiding the connection wiring connected to the motor to the outside through the wiring extraction notch.

  Further, in the electric hub device of the present invention, the rotation preventing member is formed with an engaging portion that engages with an engaged portion formed on the frame and restricts rotation in the circumferential direction with respect to the frame. The wiring takeout notch is formed at a position overlapping the engaging portion of the detent member in a side view. With this configuration, it is possible to satisfactorily take out the wiring portion connected to the motor at a position that does not overlap the frame. In other words, the engaged portion of the frame that engages with the anti-rotation member is formed at a position that extends toward the side opposite to the portion where the frame is disposed. By taking out the wiring part through the wiring extraction notch part formed at the position overlapping with the joint part, it is possible to satisfactorily prevent the wiring part from interfering with the frame.

  According to the present invention, the anti-rotation member externally fitted to the fixing hub shaft and engaged with the frame, and the motor housing are fixed with the screws in contact with each other, so that the anti-rotation member and the motor housing are fixed. It is possible to prevent rattling from occurring between the two, and since a biased load due to rattling is not added, reliability is improved. Further, since the rotation preventing member engaged with the frame is directly fixed to the motor housing, the force acting on the engaging portion between the hub shaft and the motor housing can be reduced. Therefore, even when the motor is used by switching between the auxiliary driving force generation operation and the regenerative operation, it is possible to prevent the motor housing from being damaged, and this also improves the reliability. In addition, since the heat acting on the motor housing is directly transmitted to the rotation preventing member, the heat of the motor can be dissipated well to the outside.

  In addition, the anti-rotation member has a wiring extraction notch for guiding the connection wiring connected to the motor to the outside at a position that does not overlap with the screw insertion portion through which the screw is inserted in a side view. The anti-rotation member can be fixed to the motor housing without hindrance while guiding the connection wiring connected to the motor to the outside through the notch for extraction.

  In addition, an engagement portion that engages with an engaged portion formed on the frame and restricts rotation in the circumferential direction with respect to the frame is formed on the anti-rotation member, and the cutout portion for wiring extraction has the rotation portion By forming the stopper member at a position that overlaps the engaging portion, the wiring portion connected to the motor can be satisfactorily taken out to a position that does not overlap the frame.

Overall side view of an electric bicycle according to an embodiment of the present invention Side view of the electric hub device of the electric bicycle and the vicinity thereof Sectional view of the electric hub device Partial enlarged sectional view of the electric hub device Partial enlarged sectional view of the electric hub device FIG. 6 is a partially enlarged cross-sectional view of one of the rotation preventing members of the electric hub device and its vicinity, in which (a) is a view taken along the arrow line VIa-VIa in FIG. Figure It is a figure which shows the detent | locking member of the electric hub apparatus, (a) and (b) are perspective views, (c) is a front view, (d) is a side view, (e) is a rear view, respectively. Perspective view of wiring holding member of the same electric hub device Sectional view of a conventional electric hub device (A) is a view taken along line Xa-Xa in FIG. 9, and (b) is a view taken along line Xb-Xb in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, 1 is an electric bicycle. The electric bicycle 1 includes a frame 2, front wheels 3 and rear wheels 4 provided on the frame 2, a pedal 5, a chain 6, a crank gear 7, a handle 8, and a brake lever (not shown). Including a brake device such as a disc brake device 18, a saddle 9, a battery 13, a detection device 31 that detects a pedaling force acting on the pedal 5, and a control unit 14. The frame 2 includes a chain stay 10, a back hawk 11, and the like, and a rear end 12 of a bifurcated shape is provided at the rear end of the chain stay 10 as shown in FIG. 2. The rear wheel 4 includes an electric hub device 20 disposed at the center thereof, a plurality of spokes 15 extending radially from the electric hub device 20 in the radial direction of the rear wheel 4, and an outer peripheral end of the spoke 15. And a tire 17 attached to the outer peripheral side of the rim 16. In this embodiment, the case where the disc brake device 18 is attached to the rear wheel 4 is illustrated. However, the embodiment is not limited to the one provided with the disc brake device 18, and is replaced with the disc brake device 18. In addition, other hub brake devices such as a band brake and a drum brake, a rim brake that tightens the rim from both sides with a brake shoe pad, and brakes with the friction force, and other brake devices may be used. In FIG. 1, FIG. 2, etc., only a brake disc is shown in a simplified manner as a disc brake device.

  As shown in FIGS. 2, 3, etc., the electric hub device 20 includes a pair of left and right fixing hub shafts 21, 22 that are fixed to the rear edge 12 of the rear end portion of the chain stay 10 as the frame 2. A hub body 23 that is rotatable with respect to the hub shafts 21 and 22, and a motor 24 that is disposed inside the hub body 23 and rotates the hub body 23.

  As shown in FIGS. 3 to 5, the motor 24 is provided so as to be rotatable on the inner peripheral side of the motor housing 32, the stator 33 fixed inside the motor housing 32 and covered with resin, and the stator 33. The rotor 34 and a rotating shaft 35 inserted through the center of the rotor 34 are provided, and a brushless motor is provided. The motor 24 controls the driving of the motor 24 according to the pedaling force detected by the detection device 31 by the control unit 14, and generates an auxiliary driving force to apply auxiliary driving force to the rear wheel 4 as a wheel, and the rear wheel 4 is controlled to be switched to a regenerative operation in which electric power is generated by the rotational force from 4 and the battery 13 is charged.

  The rotating shaft 35 of the motor 24 is located between the hub shafts 21 and 22, and these shafts 21, 22 and 35 are disposed on the same axis 25. The motor housing 32 includes a housing body 36 on one side (left side in FIG. 3) and a housing body 37 on the other side (right side in FIG. 3) divided in the direction of the axis 25 of the rotation shaft 35. The stator 33 is sandwiched between both housing bodies 36 and 37, and the both housing bodies 36 and 37 are connected by a plurality of screws 38. The rotating shaft 35 and the rotor 34 are rotatably supported by bearings 39 and 40 disposed near the center of the housing bodies 36 and 37.

  The hub body 23 includes a substantially cylindrical body member 27 having an opening 26 on one end side (left side in FIG. 3) in the direction of the axis 25 of the hub shafts 21 and 22, and the other end portion of the body member 27 (FIG. 3). A disc-shaped cover member 28 that closes the right side), a through hole 29 formed in the center of the cover member 28, and inserted into the through hole 29 and screwed into the cover member 28 to be coupled. A cylindrical mounting member 30 that is externally fitted in a rotatable manner with respect to the hub shaft 22 is provided.

  One end portion (left end portion in FIG. 3) of the body member 27 of the hub body 23 is rotatably supported by one housing body 36 via a bearing 41. Also, as shown in FIGS. 3 and 4, one hub shaft 21 extends radially outwardly at the end of the portion protruding into the motor 24 (in this embodiment, it expands in a hexagonal shape). (Ii) An engaging portion 21a is formed. The engaging portion 21 a is engaged with and engaged with a hexagonal hole-shaped engaging hole 36 a formed in the housing body 36. Thereby, the one housing body 36 and the one hub shaft 21 are assembled in a state where they are regulated so as not to rotate around the shaft center 25. The shapes of the engaging portion 21a of the hub shaft 21 and the engaging hole portion 36a of the housing body 36 are not limited to the hexagonal shape as long as they are engaged with each other while being regulated so as not to rotate. Further, a quadrangular shape, an octagonal shape, or other shapes may be used.

  Further, the other hub shaft 22 is inserted into the mounting member 30 and protrudes from the outside to the inside of the hub body 23. Further, as shown in FIGS. 3 and 5, the other hub shaft 22 extends radially outwardly at the end projecting into the motor 24 (in this embodiment, it expands in a hexagonal shape). ) An engaging portion 22a is formed. The engaging portion 22 a is engaged with and engaged with a hexagonal hole-shaped engaging hole 50 a formed in the support frame 50 attached to the other housing body 37 via a screw 52. As a result, the support frame 50 and the other hub shaft 22 are assembled in a state where they are regulated so as not to rotate around the axis 25. The shapes of the engaging portion 22a of the hub shaft 22 and the engaging hole portion 50a of the support frame 50 are not limited to the hexagonal shape as long as they are engaged so as not to rotate with each other. Further, a quadrangular shape, an octagonal shape, or other shapes may be used.

  As shown in FIGS. 3 and 5, the rotation shaft 35 of the motor 24 and the hub body 23 are linked via a speed reduction mechanism 45 provided adjacent to the motor 24 in the hub body 23. The speed reduction mechanism 45 includes a sun gear 46 formed at the end of the rotary shaft 35, an annular internal gear 47 (an example of an annular gear) attached to the inside of the cover member 28 via a connecting member 51, and And a plurality of rotatable planetary gears 48 meshing with the sun gear 46 and the internal gear 47. One end of the planetary gear 48 is supported by the other housing body 37 of the motor 24, and the other end of the planetary gear 48 is supported by a support frame 50 (an example of a support member) attached to the other housing body 37. .

  Each planetary gear 48 includes a large gear portion 48a and a small diameter gear portion 48b that are integrally formed with each other, and a support shaft portion 48c that rotatably supports the large gear portion 48a and the small diameter gear portion 48b. Yes. Then, the sun gear 46 meshes with the large gear portion 48a of the planetary gear 48, and the internal gear 47 meshes with the small gear portion 48b of the planetary gear 48, whereby the rotation of the rotating shaft 35 of the motor 24 is reduced, that is, The torque is increased and transmitted to the hub body 23 so that the hub body 23 is interlocked.

  Further, between the cover member 28 and the support frame 50, a bearing (thrust bearing) 54 capable of receiving a force from the support frame 50 in the direction along the axis 25 is disposed. In this embodiment, an exterior transmission is attached to the rear wheel 4, and the exterior transmission includes a rear derailleur (not shown) and a multistage freewheel 19.

  The free wheel 19 is rotatably fitted on the other hub shaft 22 on the outer side of the hub body 23. The free wheel 19 includes a cylindrical outer body 61 having a plurality of sprockets 60 meshing with the chain 6, a cylindrical inner body 62 provided inside the outer body 61, an outer body 61 and an inner body 62, And a one-way clutch 63 that transmits rotational driving force from the sprocket 60 only to the hub body 23. In addition, the outer periphery of the cylindrical inner body 62 is circular, and the inner periphery is formed in a hexagonal shape. The inner body 62 is externally fitted to the other end side of the mounting member 30, that is, a portion formed in a hexagonal shape. Thereby, the inner body 62 and the attachment member 30 are engaged with each other in the circumferential direction (rotational direction).

  A serration joint 53 in which a large-diameter serration portion 53 a and a small-diameter serration portion 53 b are integrally formed is disposed between the cover member 28 and the inner body 62. The serration joint 53 has a small-diameter serration portion 53b fitted into one end portion of the inner body 62, and a large-diameter serration portion 53a fitted into a boss portion 28a formed near the center of the cover member 28. The force from 62 is transmitted to the cover member 28 satisfactorily.

  In addition, a bearing body 64 that rotatably supports the outer body 61 is provided inside the outer body 61. Reference numeral 65 denotes a lock nut for locking the ball press provided on the bearing body 64.

  An inner peripheral side end portion of each spoke 21 of the rear wheel 4 is connected to the outer peripheral portion of the hub body 23. Both hub shafts 21, 22 are inserted into grooves 12 a as engaged portions formed in the rear ends 12 of both chain stays 10, respectively. By screwing the nuts 66 to the hub shafts 21 and 22, the rear wheel 4 is attached between the chain stays 10 together with the electric hub device 20.

  Between the rear stay 12 of the chain stay 10 on the side where the free wheel 19 is provided and the nut 66, a metal detent member 67 that restricts the other hub shaft 22 from rotating about the axis 25. (Also referred to as the other anti-rotation member 67) is provided. As shown in FIGS. 6A and 6B, the rotation preventing member 67 has a protrusion 67a as an integrally formed engaging portion fitted in a groove 12a of the rear edge 12 as an engaged portion. At the same time, a part of the circular cross section is removed in a flat shape at the center of the rotation preventing member 67 to form a deformed hole 67b having a so-called “H” shape in cross section. In accordance with this, the cross-sectional shape of the portion of the other hub shaft 22 that fits with the rotation-preventing member 67 is also partly deleted (notched) in a circular cross-section so that the cross-section is a so-called “H”. The shape is "". In FIG. 6B, reference numeral 22b denotes a notch formed in the other hub shaft 22. That is, at this location, the protrusion 67a of the rotation preventing member 67 is engaged with the groove 12a of the rear 12 so that the rotation preventing member 67 is restricted from rotating. The notch portion 22b of the other hub shaft 22 is brought into contact with and engaged with the portion 67b, so that the other hub shaft 22 is restricted from rotating around the axis 25.

  On the other hand, a detent member 70 (also referred to as one detent member 70) is also provided in contact with the rear end 12 of the chain stay 10 on the side where the brake disc of the disc brake device 18 is provided. However, the hub shaft insertion hole 70b provided in the detent member 70 and the one hub shaft 21 inserted into the hole 70b have a simple round cross section, and the other hub shaft 22 and the other detent member No notch as provided in 67 is required. The anti-rotation member 70 is made of metal and is disposed between the rear edge 12 and a portion of the housing body 36 exposed to the outside from the opening 26 of the body member 27.

  The anti-rotation member 70 is also formed with a protrusion 70a as an engaging portion that is engaged with and engaged with a groove 12a as an engaged portion formed in the rear pawl 12. The protrusion 70 a is fitted into the groove 12 a of the rear pawl 12, and the anti-rotation member 70 is engaged with the rear pawl 12 so as not to rotate around the direction of the axis 25.

  However, as shown in FIGS. 3, 4, and 7 (a) to 7 (e), a plurality of anti-rotation members 70 are provided at locations protruding outward from the opening 26 of the body member 27 in one housing body 36. The screw 72 is fixed in a state of being in direct contact with the housing contact surface portion 70d formed on the back surface side thereof. In addition, the wiring extraction cutout portion 70f for guiding the connection wiring 24a connected to the motor 24 to the outside is inserted through the screw 72 in a side view on the back surface side (surface facing the housing body 36) of the rotation preventing member 70. In this embodiment, it is formed at a position that does not overlap with the screw insertion hole 72c that is to be overlapped with the position where the protrusion 70a is formed (lower portion of the rotation stopper 70).

  Further, in this embodiment, a minute uneven portion is formed on the frame contact surface 70g that contacts the rear edge 12 of the rotation preventing member 70, and the nut 66 that is screwed to one hub shaft 21 is tightened. At this time, the frame contact surface 70g of the rotation preventing member 70 is configured to come into strong contact with the rear end 12 of the forked shape.

  In this embodiment, as shown in FIGS. 3, 4, and 8, a substantially annular wiring holding member 71 is attached to the outer peripheral portion of the surface of the housing body 36 to which the anti-rotation member 70 is attached. . In this embodiment, a plurality of protrusions 71 c protruding from the main body 71 a are formed in a part of the wiring holding member 71 and inserted into holes (not shown) formed corresponding to the housing body 36. It is comprised so that. The connection wiring 24 a of the motor 24 is passed through the central hole 71 b of the wiring holding member 71, and the connection wiring 24 a of the motor 24 is taken out through the wiring extraction notch 70 f of the anti-rotation member 70.

  In the above configuration, when the user runs the electric bicycle 1, the pedaling force acting on the pedal 7 is detected by the detection device 31 and transmitted to the free wheel 19 via the chain 6, and the free wheel 19 rotates. . The rotation of the free wheel 19 is transmitted from the outer body 61 to the inner body 62 via the one-way clutch 63, whereby the inner body 62, the mounting member 30, the cover member 28, and the body member 27 rotate integrally, and the hub The body 23 rotates about the axis 25.

  Further, the control unit 14 controls the driving of the motor 24 according to the pedaling force detected by the detection device 31. At this time, the rotating shaft 35 rotates together with the rotor 34, whereby the hub body 23 is decelerated about the axis 25 via the speed reducing mechanism 45 and rotates. Thereby, the rear wheel 4 is rotationally driven by the pedaling force acting on the pedal 7 and the rotational driving force (auxiliary power) of the motor 24 output in accordance with the pedaling force.

  In addition, the control unit 14 causes the motor 24 or the like to perform a regenerative operation when a braking operation or downhill traveling is detected. That is, the hub body 23 rotates with the rotation of the rear wheel 4, and the rotating shaft 35 and the rotor 34 of the motor 24 also rotate in conjunction with each other via the speed reduction mechanism 45. 13 to charge the battery 13 or the like.

  As described above, when the auxiliary driving force is generated by the motor 24 or when the regenerative operation is performed, the stator 33 needs to be well fixed. However, as shown in FIGS. 9 and 10, the conventional electric hub device 80 has a structure in which the hub shaft 81 and the anti-rotation member 93 are engaged with each other at the chamfered portions 81 c and 93 c. There is a possibility that rattling occurs between the rotation prevention member 93, the hub shaft 81, and the motor housing 90 during the driving of the motor. In particular, when the motor 84 of the electric hub device 80 is used by switching between the auxiliary driving force generation operation and the regenerative operation, the frequency at which the force acts on the engagement hole 90b of the motor housing 90 increases. Or the acting force may increase, and the possibility that the engaging hole 90b of the motor housing 90 is damaged due to deformation is increased.

  On the other hand, in the embodiment of the present invention, the rotation preventing member 70 and the housing body 36 of the motor housing 32 that holds the stator 33 are fixed by the screw 72 in a state of being in contact with each other. The member 70 and the housing body 36 can be fixed without rattling, thereby preventing the rattling. Further, since the detent member 70 engaged with the rear edge 12 of the frame by the projection 70a is directly fixed to the housing body 36, the force for restricting the rotation of the housing body 36 holding the stator 33 is It can be directly received by the rotation-preventing member 70 whose position is restricted at the rear end 12. Accordingly, although one hub shaft 21 and the housing body 36 are engaged by the engaging portion 21a and the engaging hole portion 36a to restrict the rotation of the housing body 36, the hub shaft 21 and the housing body 36 are connected to the hub shaft 21 via this path. The force acting on the engagement portion with the housing body 36 can be reduced. Therefore, as described above, even when the motor 24 is used by switching between the auxiliary driving force generation operation and the regenerative operation, the housing body 36 can be prevented from being damaged, and the reliability is improved. Further, the heat acting on the housing body 36 of the motor housing 32 is directly applied to the anti-rotation member 70 that is in direct contact with the motor housing 32 and the frame 2 such as the chain stay 10 and the back fork 11 via the anti-rotation member 70. Since it is transmitted, the heat of the motor 24 can be dissipated well to the outside, which also improves the reliability.

  Moreover, according to said structure, the connection wiring 24a connected to the motor 24 is guided outside to the location which does not overlap with the screw insertion hole part 70c which penetrates the screw 72 in side view in the rotation stop member 70. A wiring takeout notch 70f is formed. Accordingly, the rotation preventing member 70 can be fixed to the housing body 36 without hindrance while guiding the connection wiring 24a connected to the motor 24 to the outside via the wiring extraction notch 70f.

  Further, the rotation preventing member 70 is formed with a protrusion 70a as an engaging portion that engages with the groove 12a as the engaged portion formed in the rear edge 12, and the wiring extraction notch portion 70f is seen in a side view. Thus, by forming the anti-rotation member 70 at a position overlapping the groove 12a, the connection wiring 24a connected to the motor 24 can be satisfactorily taken out to a position that does not overlap the chain stay 10 or the back fork 11 as a frame. That is, as shown in FIG. 10B, in the conventional detent 93 on the side from which the connection wiring 24a is taken out, the curved recess 93b that bends while guiding the connection wiring 84a is formed on the entire circumference. In addition, a mark or the like indicating which direction the connection wiring 84a should be taken out must be attached to the curved recess 93b. On the other hand, according to the embodiment of the present invention, since the cutout portion 70f for wiring extraction is provided only in a part in the circumferential direction, there is no need to make a mark or the like, and the connection wiring 84a is excellent. Since it can be taken out at a proper position, workability is good.

  In the above embodiment, the case where the exterior transmission and the disc brake device 18 are provided has been described. However, the present invention is not limited to this, and the case where the exterior transmission and the disc brake device 18 are not provided. However, as described above, it is possible to similarly apply the configuration in which the rotation preventing member 70 and the motor housing 32 are fixed. Further, in the above embodiment, the case where the rotation preventing member 70 and the housing body 36 are fixed with the screw 72 for only one hub shaft 21 on the side where the motor housing 32 is provided has been described. Instead, in the case of not having an exterior transmission, the anti-rotation member 67 and the support frame 50 may be fixed with screws for the other hub shaft 22 on the side where the speed reduction mechanism 45 is provided.

  In the above embodiment, the electric hub device 20 is provided on the rear wheel 4, but may be provided on the front wheel 3. Moreover, although the case of the electric bicycle which can also perform regenerative operation was described in the said embodiment, of course, it can apply also to the electric bicycle which does not perform regenerative operation.

  The present invention is particularly suitable for an electric bicycle provided with an electric hub device. However, the present invention can also be applied to an electric vehicle other than the electric bicycle, such as an electric wheelchair, an electric motorcycle, an electric vehicle, and the like.

1 Electric bicycle 2 Frame 3 Front wheel
4 Rear wheels
5 Pedal 6 Chain 10 Chain stay 11 Back fork 12 Rear end 12a Groove (engaged part)
DESCRIPTION OF SYMBOLS 13 Battery 14 Control part 18 Disc brake 20 Electric hub apparatus 21, 22 Hub shaft 21a, 22a Engagement part 22b Notch part 23 Hub body 24 Motor 25 Axis 26 Opening part 27 Body member 31 Detection apparatus 32 Motor housing 33 Stator 34 Rotor 35 Rotating shaft 36, 37 Housing body 36a, 50a Engagement hole 38 Screw 39, 40 Bearing 41 Bearing 45 Reduction mechanism 54 Bearing 64 Bearing body 65 Lock nut 66 Nut 67, 70 Anti-rotation member 67a, 70a Projection (engagement) Joint)
70b Hole portion 70d Housing contact surface portion 70f Wiring extraction cutout portion 70g Frame contact surface 71 Wiring holding member 72 Screw 72c Screw insertion hole portion

Claims (6)

An electric hub device having a hub shaft fixed to a frame, a hub body rotatable with respect to the hub shaft, and a motor disposed on the hub body and rotating the hub body,
A motor housing in which a motor stator is fixed and a hub shaft is engaged;
A detent member that is fitted on the hub shaft and engaged with the frame, and is attached in a state of being restricted from rotating about the hub shaft axis;
The electric hub device, wherein the rotation preventing member and the motor housing are fixed with screws in a state where they are in contact with each other.   2. The electric hub according to claim 1, wherein the motor is used by being switched between an auxiliary driving force generating operation for applying auxiliary driving force to the wheel and a regenerative operation for generating electric power by the force from the wheel. apparatus.   2. The electric hub device according to claim 1, wherein the hub shaft is divided into right and left, and a rotating shaft rotating coaxially with the hub shaft is disposed between the hub shafts.   In the anti-rotation member, in a side view, a notch portion for wiring extraction that guides the connection wiring connected to the motor to the outside is formed at a position that does not overlap with the screw insertion hole portion through which the screw is inserted. The electric hub device according to any one of claims 1 to 3.   An engagement portion that engages with an engaged portion formed on the frame and restricts rotation in the circumferential direction with respect to the frame is formed on the detent member, and the wiring takeout notch portion is in a side view. The electric hub device according to claim 4, wherein the electric hub device is formed at a position overlapping the engaging portion of the rotation preventing member.   An electric bicycle comprising the electric hub device according to any one of claims 1 to 5.

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