JP2014118087A - Electric hub device and electric bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric hub device capable of preventing rain water and the like from infiltrating into the inner side of a hub body even when the one with no or an insufficient shield function is usd as a bearing for rotatably supporting the hub body.SOLUTION: In a hub body 23, at a portion facing a bearing 54 which rotatably supports the hub body 23, a grease holding part 70 capable of holding a grease G is formed and the grease G is held by the grease holding part 70. With this configuration, rain water can be prevented from infiltrating into the side deeper than the grease holding part 70. Therefore, even when the one with no or an insufficient shield function is used as the bearing 54 for rotatably supporting the hub body 23, rain water can be prevented from infiltrating into the side deeper than the grease holding part 70.

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 a wheel of an electric bicycle, for example, as shown in FIG. 7, a pair of left and right hub shafts fixed to a frame 100 such as a chain stay of the electric bicycle is provided. 101, 102, a hub body 103 rotatable with respect to the hub shafts 101, 102, and a motor 104 disposed inside the hub body 103 and rotating the hub body 103 (for example, Patent Document 1). 7, 105 is a spoke, 106 is a rotating shaft of the motor 104, 108 is a rotor of the motor 104, 109 is a stator of the motor 104, and 116A and 116B are housing bodies of the motor 104, respectively. The rotating shaft 106 is disposed between the left and right hub shafts 101 and 102. Reference numeral 110 denotes a chain for transmitting a pedaling force (manpower driving force) from the pedal, and 111 denotes a free wheel of the exterior transmission.

  The rotor 108 and the rotating shaft 106 of the motor 104 are interlocked with the hub body 103 via a speed reduction mechanism 107 including a planetary gear mechanism provided in the hub body 103. The hub body 103 includes a substantially cylindrical body member 121 that is open on one side, a disk-shaped cover member 122 that closes the opening side of the body member 121, a through-hole 123 formed in the center of the cover member 122, and A boss portion 124 and a cylindrical attachment member 125 inserted into the through hole 114 and externally fitted to the hub shaft 102 so as to be rotatable are provided.

  The free wheel 111 is rotatably fitted to the hub shaft 102 on the outer side of the hub body 103. The free wheel 111 includes a cylindrical outer body 113 having a plurality of sprockets 112 meshing with the chain 110, a cylindrical inner body 114 provided inside the outer body 113, an outer body 113 and an inner body 114. And a one-way clutch 115 that transmits the rotational driving force from the sprocket 112 only to the hub body 103. In addition, a large-diameter portion 126 is formed on one side of the inner body 114, and a sawtooth-like uneven portion is provided on the inner peripheral portion of the large-diameter portion 126 and the outer periphery of the boss portion 124 of the cover member 122. Serration portions 127 and 128 meshing with each other are formed and engaged. A bearing body 118 that rotatably supports the outer body 113 is provided inside the outer body 113.

  The speed reduction mechanism 107 meshes with a sun gear 129 formed at the end of the rotating shaft 106, an annular internal gear 130 attached to the inside of the cover member 122, and the sun gear 129 and the internal gear 130. And a plurality of planetary gears 131 that are rotatable. One end of the planetary gear 131 is supported by one housing body 116 </ b> A that holds the motor 104, and the other end of the planetary gear 131 is supported by a support frame 117 attached to the one motor housing body 116.

  Each planetary gear 131 has a large gear portion 131a and a small gear portion 131b. The sun gear 129 meshes with the large gear portion 131a of the planetary gear 131, and the internal gear 130 meshes with the small gear portion 131b of the planetary gear 131, so that the rotation of the rotating shaft 106 of the motor 104 is reduced, that is, It is configured to increase the torque and transmit the auxiliary driving force to the hub body 103 to interlock the hub body 103. In addition, a bearing 132 that rotatably supports the hub body 103 is disposed between the cover member 122 and the support frame 117. As the bearing 132, for example, a cup-and-cone type is used. A bearing 133 that rotatably supports the hub body 103 is also disposed between the other housing body 116 </ b> B and the hub body 103.

  When the user runs the electric bicycle, a pedaling force (human driving force) acting on the pedal is transmitted to the free wheel 111 via the chain 110, and the rotation of the free wheel 111 is transmitted from the outer body 113 to the one-way clutch. It is transmitted to the inner body 114 via 115. Further, the rotation of the inner body 114 is transmitted to the cover member 122 via the serration portions 127 and 128, whereby the inner body 114, the mounting member 125, the cover member 122, and the trunk member 121 are integrally rotated. The hub body 103 rotates around the axis. Further, the motor 104 is rotated in accordance with the pedaling force acting on the pedal, and the hub body 103 is rotated in a state where the rotational force of the motor 104 is added to the pedaling force (human power driving force) as an auxiliary driving force.

JP2012-121337

  By the way, since such an electric hub device is provided with the motor 104, the speed reduction mechanism 107, and the like, it is necessary to configure so that rain water W or the like does not enter the inside of the hub body 103. Therefore, in the electric hub device, it is preferable to use a shield bearing having a waterproof function as the bearings 132 and 133 so that rainwater W does not enter from the bearings 132 and 133 that rotatably support the hub body 103. . However, since a sealed bearing having a waterproof function has dimensions determined by the standard and there are only limited types, the degree of freedom of design is often low.

  Since there is no other component at the place where the one bearing 133 that rotatably supports the hub body 103 is provided and there is a relatively large space for the arrangement, a shield bearing is used as the bearing 133. It is possible to use.

  On the other hand, in the vicinity of another bearing 132 disposed between the cover member 122 and the support frame 117, a large number of components such as components of the speed reduction mechanism 107 are disposed. Space is limited. Therefore, as the bearing 132, a bearing 132 that does not have a waterproof function or does not have a high waterproof function is often used. Further, when a shield bearing is used as the bearing 132 that rotatably supports the hub body 103, the waterproof performance is improved, but the contact resistance is increased by providing the shield member, so that the hub body 103 rotates smoothly. There is a risk of being lost.

  As shown in FIG. 7, when a free wheel or the like of an exterior transmission is provided, the bearing 132 is disposed at a relatively deep position, but a bearing body 118 is provided. Since rainwater W may reach the bearing 132 through the location and the gap between the hub shaft 102 and the mounting member 125, the bearing 132 preferably has a waterproof function.

  The present invention solves the above problem, and even when a bearing that supports the hub body in a rotatable manner is used that does not have or does not have a shielding function, rainwater or the like enters the inside of the hub body. It is an object of the present invention to provide an electric hub device that can prevent the above-described problem.

  In order to solve the above problems, an electric hub device of the present invention includes a hub shaft fixed to a frame, a hub body rotatable with respect to the hub shaft, and a hub body rotatably supported. An electric hub device having a non-shield type bearing and a motor disposed on the hub body and rotating the hub body, wherein the hub body faces at least one bearing that rotatably supports the hub body. In addition, a grease holding portion capable of holding the grease is formed, and the grease is held in the grease holding portion.

  According to this configuration, even when rainwater enters through the outer periphery of the hub shaft, it is possible to prevent rainwater from invading deeper than the grease holding portion by the grease held by the grease holding portion. Therefore, even when a bearing that does not have a shield function or is insufficient as a bearing that rotatably supports the hub body, it is possible to prevent rainwater from invading deeper than the grease holding portion.

  Further, according to the present invention, the hub shaft is inserted into a through hole formed in the hub body and protrudes from the outside to the inside of the hub body, and the rotating shaft and the hub body of the motor are provided in the hub body. The speed reduction mechanism is interlocked with the speed reduction mechanism. The speed reduction mechanism includes a sun gear formed on the rotation shaft, an annular gear provided in the hub body, and a rotatable planetary gear that meshes with the sun gear and the annular gear. The planetary gear is supported by a support member provided in the motor, the support member has a recess facing the through hole in the axial direction of the hub shaft, and the space facing the recess is a grease holding portion. It is characterized by being.

  With this configuration, the grease can be held without increasing the dimension of the hub body in the width direction (axial direction of the hub shaft). As a result, a compact configuration can be achieved as the electric hub device.

  The present invention is characterized in that the bearing is a thrust needle roller bearing. With this configuration, the axial force of the hub shaft of the bearing can be kept small compared to the case where a cup-and-cone type bearing is used while being able to receive a thrust force in a satisfactory manner. Thereby, the dimension of the hub body in the width direction (axial direction of the hub shaft) can be kept small, and the electric hub device can be made compact.

  Further, the present invention is characterized in that the grease holding portion is formed at a position on the back side in the axial direction of the hub shaft with respect to the bearing. This configuration makes it possible to reduce the possibility of water entering the grease holding portion as compared with the case where the grease holding portion is disposed at the same position as the bearing in the axial direction of the hub shaft or the front side position. , Reliability can be improved.

  Further, the present invention is characterized in that a bearing ring is disposed on the bearing, and grease is filled between the bearing ring and a mounting portion of the bearing. With this configuration, even when the rotation of the bearing deteriorates, it is possible to prevent the bearing ring from rotating and wear the hub body to which the bearing is attached, and the reliability is improved.

  Further, the present invention is characterized in that a free wheel of the exterior transmission is provided. With this configuration, it is possible to satisfactorily cope with the case where the width of the hub body cannot be increased by providing the freewheel of the exterior transmission.

  According to the present invention, a grease holding portion capable of holding grease is formed at a location facing at least one bearing that rotatably supports the hub body in the hub body, and the grease holding portion holds the grease. Even when rainwater enters through the outer periphery of the hub shaft, it is possible to prevent rainwater from intruding into the back side of the grease holding portion by the grease held in the grease holding portion. Therefore, even when a bearing that does not have a shield function or is insufficient as a bearing that rotatably supports the hub body, it can be waterproofed well and reliability is improved. Further, since a non-shielded bearing can be used as a bearing that rotatably supports the hub body, it is difficult to be restricted by the arrangement space and the like, and the degree of freedom in design is improved.

  In addition, the support member that supports the planetary gear of the speed reduction mechanism is formed with a recess facing the through hole in the axial direction of the hub shaft, and the space facing the recess serves as a grease holding portion, so that the width direction of the hub body Grease can be held without increasing the dimension in the axial direction of the hub shaft, and the electric hub device can be made compact in the width direction.

  Also, by using a thrust needle roller bearing as the bearing, the hub shaft of the bearing can be compared with the case of using a cup-and-cone type bearing as the bearing while being able to receive a force in the thrust direction satisfactorily. The dimension in the center direction (the width direction of the hub body) can be kept small, and the electric hub device can have a compact configuration in the width direction.

  Further, by forming the grease holding portion at a position on the back side in the axial direction of the hub shaft with respect to the bearing, the possibility of water entering the grease holding portion can be reduced, and the reliability can be improved.

  Further, by arranging a bearing ring on the bearing and filling grease between the bearing ring and the mounting position of the bearing, even if the rotation of the bearing deteriorates, the bearing ring rotates and the bearing is rotated. It is possible to prevent the attached hub body from being worn, and the reliability is improved.

  Further, it is possible to cope with a case where a free wheel of the exterior transmission is provided and the width of the hub body cannot be increased.

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 sectional view of the electric hub device Partial sectional view of the electric hub device Partial enlarged sectional view of the electric hub device Sectional view of a conventional electric hub device

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 has a frame 2, a front wheel 3 and a rear wheel 4 provided on the frame 2, a pedal 5 on which a manpower driving force (stepping force of a user) is loaded, and a manpower driving force transmitted to the rear wheel 4 side. A chain 6 as a driving force transmission cable body, a crank gear 7 for transmitting a manpower driving force to the chain 6, a handle 8, an exterior transmission 18, a saddle 9, a battery 13, and a human force acting on the pedal 5. A detection device 31 for detecting a driving force, a control unit 14 and the like are provided. 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. As shown in FIG. 1, the exterior transmission 18 includes a rear derailleur 42 and a multistage freewheel 19. 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.

  As shown in FIGS. 2, 3, and the like, the electric hub device 20 includes a pair of left and right fixing hub shafts 21 and 22 fixed to the rear end 12 and the hub shafts 21 and 22. A rotatable hub body 23 and a motor 24 disposed inside the hub body 23 and rotating the hub body 23 are provided.

  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 generates an auxiliary driving force according to the pedaling force detected by the detection device 31 by the control unit 14. Note that the control unit 14 may be configured to be switched to a regenerative operation in which electric power is generated by the rotational force from the rear wheel 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. The body member 27 and the cover member 28 are made of, for example, an aluminum alloy.

  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.

  As shown in FIGS. 3 and 5, 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. The other hub shaft 22 is formed with an engaging portion 22a at an end portion projecting into the motor 24 so as to expand outward in the radial direction (in this embodiment, expand in a hexagonal shape). The engaging portion 22a is fitted and engaged with a hexagonal hole-shaped engaging hole 50a formed in the support member 50 attached to the other housing body 37 via a screw 52. As a result, the support member 50 and the other hub shaft 22 are assembled in a state of being regulated so as not to rotate about the shaft center 25.

  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 member 50 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 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, It is configured to increase the torque and transmit the auxiliary driving force to the hub body 23 to interlock the hub body 23.

  As described above, the exterior transmission 18 is attached to the rear wheel 4, and the exterior transmission 18 includes a rear derailleur 42 (see FIG. 1) and a multistage freewheel 19. As shown in FIGS. 3 and 5, 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 plurality of sprockets 60 serving as a manpower driving force transmission wheel that selectively meshes with the chain 6 to transmit the manpower driving force from the chain 6, and a cylindrical outer member including these sprockets 60. A body 61, a cylindrical inner body 62 rotatably provided inside the outer body 61 via a bearing, and provided between the outer body 61 and the inner body 62 and from the sprocket 60 to the hub body 23 only. And a one-way clutch 63 that transmits the rotational driving force. The inner body 62 and the attachment member 30 are engaged with each other in the circumferential direction (rotation 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. In this embodiment, a case is described in which a sealing material 68 (see FIG. 5) is provided from the vicinity of the place where the lock nut 65 is disposed to minimize entry of dust, rainwater W, and the like. However, the sealing material 68 is not necessarily provided.

  As shown in FIGS. 3, 5, and 6, a bearing 54 that rotatably supports the hub body 23 is disposed between the cover member 28 of the hub body 23 and the support member 50 of the speed reduction mechanism 45. ing. The bearing 54 is constituted by a non-shielded thrust needle roller bearing (thrust bearing) including a pair of race rings 54a and needle rollers 54b disposed between the race rings 54a. The thrust bearing can receive a force in a direction along the axis 25 from the support member 50.

  Then, as shown in FIG. 6, at a location facing the bearing 54, in this embodiment, at a location on the inner diameter side of the bearing 54 where rainwater W or the like may enter from the outside of the electric hub device 20, A grease holding portion 70 that can hold the grease G that does not allow water to pass through is formed, and the grease G is held in the grease holding portion 70. In this embodiment, a recess 50b is formed at a location facing the through hole 22a through which the hub shaft 22 is passed in the support member 50, and a space facing the recess 50b serves as the grease holding portion 70. Further, the grease holding portion 70 is formed at a location on the back side in the direction of the axis 25 of the hub shaft 22 relative to the bearing 54.

  Although not shown, the bearing ring 54a of the bearing 54 is attached to the bearing 54, that is, between one of the bearing rings 54a and the cover member 28 and between the other bearing ring 54a and the support member 50. Each is filled with grease.

  As shown in FIG. 3, the inner peripheral side end portion of each spoke 15 of the rear wheel 4 is connected to the outer peripheral portion of the hub body 23. Anti-rotation members 71 and 67 are assembled to both hub shafts 21 and 22, and protrusions 71 a and 67 a formed on the anti-rotation members 71 and 67 are respectively fitted in the grooves 12 a of the rear tread 12, and the rear tread 12. On the other hand, the rotation preventing members 71 and 67 are engaged so as not to rotate around the direction of the axis 25.

  In the above configuration, when the user runs the electric bicycle 1, the human driving force (stepping force) acting on the pedal 5 is detected by the detection device 31 and transmitted to the free wheel 19 via the chain 6. The 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 and further to the cover member 28 via the serration joint 53. As a result, the inner body 62, the attachment member 30, the cover member 28, and the body member 27 rotate integrally, and the hub body 23 rotates around the axis 25.

  Further, the control unit 14 controls driving of the motor 24 according to the human power driving 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. As a result, the rear wheel 4 is rotationally driven by combining the manual driving force acting on the pedal 5 and the auxiliary driving force of the motor 24 output in accordance with the manual driving force.

  Further, in the case of having a regenerative function, the control unit 14 causes the motor 24 or the like to perform a regenerative operation when detecting a braking operation, downhill traveling, or the like. 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.

  Here, in the above-described configuration, the portion facing the bearing 54 inside the hub body 23, more specifically, the inside diameter of the bearing 54 may have rainwater W or the like that may enter from the outside of the electric hub device 20. A grease holding portion 70 that can hold the grease G that does not allow water to pass through is formed in the side portion, and the grease G is held by the grease holding portion 70.

  With this configuration, as shown in FIGS. 5 and 6, even if rainwater W enters through the outer periphery of the hub shaft 22 by passing through the location where the sealing material 68 is disposed, etc. The grease G held by the holding unit 70 can prevent rainwater from invading deeper than the grease holding unit 70. Therefore, even when a bearing 54 that supports the hub body 23 in a rotatable manner is used that has no or insufficient shielding function, it is possible to satisfactorily prevent rainwater from penetrating beyond the grease holding portion 70. , Improve reliability. Further, since the non-shield type bearing 54 can be used as the bearing 54 that rotatably supports the hub body 23, it is difficult to be restricted by the arrangement space and the like, and the degree of freedom in design is improved.

  Further, according to the above configuration, the support member 50 that supports the planetary gear 48 of the speed reduction mechanism 45 is formed with the recess 50b that faces the through hole 29 in the direction of the axis 25 of the hub shaft 22, and faces the recess 50b. Is the grease holding unit 70. As a result, the grease G can be held without increasing the dimension of the hub body 23 in the width direction (in the direction of the axis 25 of the hub shaft 22), and the electric hub device 20 can be made compact in the width direction. be able to.

  Further, by using a thrust needle roller bearing as the bearing 54, the hub of the bearing 54 can be compared with a case where a cup-and-cone type is used as the bearing 54 while being able to receive a force in the thrust direction satisfactorily. The width dimension along the axial direction of the shaft 22 (the width dimension of the hub body 23) can be kept small, and the electric hub device 20 has the advantage of being able to have a compact configuration in the width direction.

  Further, by forming the grease holding portion 70 at a position on the back side in the direction of the axis 25 of the hub shaft 22 relative to the bearing 54, the possibility of water entering the grease holding portion 70 can be further reduced, and reliability can be improved. Can be improved.

  Also, if the rotation of the bearing 54 is deteriorated by filling grease between the bearing ring 54a of the bearing 54 and the mounting portion of the bearing 54 (the cover member 28 and the support member 50 of the hub body 23), However, it is possible to prevent the raceway ring 54a from rotating and wear the cover member 28, the support member 50, etc. of the hub body 23 to which the bearing 54 is attached, thereby further improving the reliability.

  Further, as described above, since the width dimension of the hub body 23 in which the bearings 54 are disposed can be minimized, the hub body 23 is designed by providing the free wheel 19 of the exterior transmission 18 or the like. Even when it is difficult to increase the width, it can be dealt with satisfactorily.

  In the above embodiment, the case where a thrust needle roller bearing is used as the bearing 54 has been described. However, the present invention is not limited to this, and a cup and cone type is used instead of the thrust needle roller bearing. Or other unshielded bearings may be used.

  In the above-described embodiment, the case where the grease holding portion 70 that holds the grease G at the location facing the bearing 54 is formed using one of the bearings 54 as a non-shielded bearing is described. In some cases, the same configuration may be adopted for the other bearing that rotatably supports the hub body 23.

  Moreover, although the case where the exterior transmission 18 was provided was described in the said embodiment, it is not restricted to this, As mentioned above also about what is not provided with the exterior transmission 18, It is possible to apply the structure regarding the bearing 54 and the grease holding | maintenance part 70 similarly. Moreover, although the case of the electric bicycle 1 which can also perform regenerative operation | movement was described in the said embodiment, Of course, it can apply also to the electric bicycle which does not perform regenerative operation | movement. In the above embodiment, the case where the human driving force is transmitted to the sprocket 60 as the human driving force transmission wheel by the chain as the driving force transmission rope has been described. However, the present invention is not limited to this. For example, a toothed belt may be used as the driving force transmission cable body, and a gear as a human power driving force transmission wheel body meshing with the toothed belt may be used.

  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 Backhawk 12 Back 13 Battery 14 Control unit 19 Freewheel 20 Electric hub device 21, 22 Hub shaft 23 Hub body 24 Motor 25 Shaft 27 Body member 28 Cover member 29 Through hole 31 Detection Device 32 Motor housing 33 Stator 34 Rotor 35 Rotary shaft 45 Deceleration mechanism 50 Support member 53 Serration joint 54 Bearing 60 Sprocket 61 Outer body 62 Inner body 63 One-way clutch 70 Grease holding part

Claims (7)

A hub shaft fixed to the frame, a hub body rotatable with respect to the hub shaft, a non-shielded bearing for rotatably supporting the hub body, and a hub body disposed on the hub body An electric hub device having a motor for rotating the motor,
A grease holding portion capable of holding grease is formed at a location facing at least one bearing that rotatably supports the hub body in the hub body, and the grease is held in the grease holding portion. Hub device. The hub axle is inserted into the through-hole formed in the hub body, and projects from the outside to the inside of the hub body.
The rotating shaft of the motor and the hub body are linked via a speed reduction mechanism provided in the hub body,
The speed reduction mechanism has a sun gear formed on the rotating shaft, an annular gear provided in the hub body, and a rotatable planetary gear that meshes with the sun gear and the annular gear,
The planetary gear is supported by a support member provided in the motor,
The support member has a recess facing the through hole in the axial direction of the hub shaft,
The electric hub device according to claim 1, wherein a space facing the recess is the grease holding portion.   The electric hub device according to claim 1, wherein the bearing is a thrust needle roller bearing.   The electric hub device according to any one of claims 1 to 3, wherein the grease holding portion is formed at a position on the back side in the axial direction of the hub shaft with respect to the bearing.   5. The electric hub according to claim 1, wherein a bearing ring is disposed on the bearing, and grease is filled between the bearing ring and a mounting portion of the bearing. apparatus.   The electric hub device according to any one of claims 1 to 5, wherein a free wheel of the exterior transmission is provided.   An electric bicycle comprising the electric hub device according to any one of claims 1 to 6.

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