Patent Publication Number: US-11643166-B2

Title: Bicycle

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to Japanese Patent Application No. 2017-151596, filed on Aug. 4, 2017, and is a continuation application of U.S. patent application Ser. No. 16/053,182, filed on Aug. 2, 2018. The entire disclosures of Japanese Patent Application No. 2017-151596 and U.S. patent application Ser. No. 16/053,182 are hereby incorporated herein by reference. 
    
    
     BACKGROUND 
     Field of the Invention 
     The present invention generally relates to a bicycle having a bicycle body and a bicycle component mounted to the bicycle body. More specifically, the present invention relates to such a bicycle in which the bicycle component includes a bicycle drive unit. 
     Background Information 
     A drive unit is a bicycle component that includes a motor that assists propulsion of a bicycle. One example of such a drive unit is disclosed in Japanese Patent No. 4416620, which describes a motor unit that mounts a bicycle component on a frame by fastening a bolt to a hole of a projection on an outer portion of a housing and to a hole of the frame. 
     SUMMARY 
     It is difficult to reduce the motor unit in size in a direction orthogonal to a widthwise direction of the bicycle because of the projection on the outer portion of the housing. 
     One object of the present disclosure is to provide a bicycle component that can be reduced in size in the direction orthogonal to the crankshaft. Another object is to enable easy installation and removal of such a bicycle component. 
     A bicycle in accordance with a first aspect of the present disclosure has a bicycle body, a bicycle component, and a battery. The bicycle body has a frame including a down tube, a component mounting portion, and a seat tube. The bicycle component includes a bicycle drive unit. At least a portion of the bicycle component is arranged inside the frame. The battery is mounted on the bicycle to supply the bicycle component with electrical power. The frame further includes a first open portion that is provided on the component mounting portion and opens toward an upper side of the bicycle. At least a portion of the bicycle drive unit is disposed inside the frame and is exposed through the first open portion. With the first aspect, the bicycle component can be installed, removed, and accessed more readily via the first open portion. 
     In the bicycle according a second aspect of the present disclosure, in addition to the features of the first aspect, the first open portion extends to the down tube. With the second aspect, the bicycle component can be installed, removed, and accessed more readily. 
     In the bicycle according a third aspect of the present disclosure, in addition to the features of the first aspect, the first open portion extends to the seat tube. With the third aspect, the bicycle component can be installed, removed, and accessed more readily. 
     In the bicycle according to a fourth aspect of the present disclosure, in addition to the features of the first aspect, the component mounting portion includes a first side wall, a second side wall and a bottom wall. The first side wall and the second side wall are connected to the down tube, the seat tube, and the chain stay. The bottom wall is connected to the lower end of the first side wall, the lower end of the second side wall, the down tube, and the chain stay. 
     In the bicycle according to a fifth aspect of the present disclosure, in addition to the features of the fourth aspect, a first coupling member is arranged on the first side wall. The first coupling member couples the frame and the bicycle component. With the fifth aspect, the bicycle component can be installed and removed more readily. 
     In the bicycle according to a sixth aspect of the present disclosure, in addition to the features of the fifth aspect, a first mounting portion is arranged on the second side wall. The first mounting portion couples the frame and the bicycle component. With the sixth aspect, the bicycle component can be installed and removed more readily. 
     In the bicycle according a seventh aspect of the present disclosure, in addition to the features of the sixth aspect, a second coupling member arranged on the bottom wall and coupling the frame and the bicycle component. With the seventh aspect, the bicycle component can be installed and removed more readily. 
     In the bicycle according an eighth aspect of the present disclosure, in addition to the features of the fourth aspect, a first mounting portion is arranged on the second side wall and couples the frame and the bicycle component. With the seventh aspect, the bicycle component can be installed and removed more readily. 
     In the bicycle according to a ninth aspect of the present disclosure, in addition to the features of the fourth aspect, a second coupling member is arranged on the bottom wall and coupling the frame and the bicycle component. With the ninth aspect, the bicycle component can be installed and removed more readily. 
     In the bicycle according to a tenth aspect of the present disclosure, in addition to the features of the fourth aspect, the bottom wall includes a second open portion. With the tenth aspect, the bicycle component can be accessed more readily. 
     In the bicycle according to an eleventh aspect of the present disclosure, in addition to the features of the first aspect, a cover closing the first open portion. With the eleventh aspect, the bicycle component can be accessed more readily while also being protected by the cover. 
     In the bicycle according to a twelfth aspect of the present disclosure, in addition to the features of the first aspect, at least a part of the battery is disposed inside of the frame. 
     In the bicycle according to a thirteenth aspect of the present disclosure, in addition to the features of the first aspect, at least a part of the battery is disposed inside of the down tube. 
     The bicycle component in accordance with the present disclosure allows the bicycle component to be reduced in size in a direction orthogonal to the crankshaft. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Referring now to the attached drawings which form a part of this original disclosure. 
         FIG.  1    is a side elevational view of a bicycle including a bicycle component in accordance with a first embodiment. 
         FIG.  2    is a perspective view of a portion in the vicinity of a crankshaft of the bicycle illustrated in  FIG.  1   . 
         FIG.  3    is a perspective view of the bicycle component in accordance with the first embodiment. 
         FIG.  4    is a left side elevational view of the portion in the vicinity of the crankshaft of the bicycle illustrated in  FIG.  2   . 
         FIG.  5    is a right side elevational view of the portion in the vicinity of the crankshaft of the bicycle illustrated in  FIG.  2   . 
         FIG.  6    is a perspective view of the portion in the vicinity of the crankshaft of the bicycle illustrated in  FIG.  2   . 
         FIG.  7    is a cross-sectional view of the portion in the vicinity of the crankshaft of the bicycle illustrated in  FIG.  2    as seen along section line D 7 -D 7  in  FIG.  5   . 
         FIG.  8    is a perspective view of a second member of the bicycle component illustrated in  FIG.  7   . 
         FIG.  9    is a partially enlarged cross-sectional view of the portion in the vicinity of the crankshaft of the bicycle illustrated in  FIG.  7   . 
         FIG.  10    is a perspective view of a portion in the vicinity of a crankshaft in a bicycle including a bicycle component in accordance with a second embodiment. 
         FIG.  11    is a right side elevational view of a portion in the vicinity of the crankshaft of a bicycle including a first modification of the bicycle component. 
         FIG.  12    is a left side elevational view of a portion in the vicinity of the crankshaft of a bicycle in a second modification. 
         FIG.  13    is a right side elevational view of the portion in the vicinity of the crankshaft of the bicycle of  FIG.  12   . 
         FIG.  14    is a right side elevational view of a portion in the vicinity of the crankshaft of a bicycle in a third modification. 
         FIG.  15    is a cross-sectional view of a part of a first mounting portion in a fourth modification. 
         FIG.  16    is a cross-sectional view of a part of a first mounting portion in a fifth modification. 
     
    
    
     DETAILED DESCRIPTION OF EMBODIMENTS 
     Selected embodiments will now be explained with reference to the drawings. It will be apparent to those skilled in the bicycle field from this disclosure that the following descriptions of the embodiments are provided for illustration only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents. 
     First Embodiment 
     A bicycle  10  including a bicycle component  40  in accordance with a first embodiment will now be described with reference to  FIGS.  1  to  9   . The bicycle  10  is a road bike. However, the present disclosure is also applicable to a bicycle other than a road bike such as a mountain bike and a city bike. The vertical direction of the bicycle  10  is the vertical direction in a state in which the bicycle  10  is ridable and held upright on a level surface. The sideward direction of the bicycle  10  is the sideward direction as viewed in the traveling direction of the bicycle  10  in a state in which the bicycle  10  is ridable and held upright on a level surface. 
     As shown in  FIGS.  1  and  2   , the bicycle  10  includes a bicycle body  12 , a pair of wheels  14 , a drive mechanism  16 , a battery  18  and the bicycle component  40 . In the present embodiment, the bicycle component  40  is a bicycle drive unit. The bicycle body  12  includes a frame  22 , a front fork  24  and a handlebar  26 B. The front fork  24  is connected to the frame  22 . The handlebar  26 B is connected in an attachable and removable manner to the front fork  24  by a stem  26 A. The front fork  24  is supported by the frame  22 . 
     The frame  22  includes a head tube  22 A, a top tube  22 B, a down tube  22 C, a component mounting portion  22 D, a seat tube  22 E, a seat stay  22 F and a chain stay  22 G. The component mounting portion  22 D is connected to the down tube  22 C, the seat tube  22 E, and the seat stay  22 F. 
     The wheels  14  include a front wheel  28  and a rear wheel  30 . The front wheel  28  includes an axle  28 A connected to an end of the front fork  24 . The rear wheel  30  includes an axle  30 A connected to a rear end of the frame  22 . 
     The drive mechanism  16  includes a crank  32  and a pair of pedals  34 . The crank  32  includes a crankshaft  32 A and a pair of crank arms  32 B. The drive mechanism  16  transmits manual driving force, which is applied to the pedals  34 , to the rear wheel  30 . The drive mechanism  16  includes a front rotation body  36  coupled to an output portion  51  of the bicycle component  40 . The front rotation body  36  includes a sprocket, a pulley, or a bevel gear. The drive mechanism  16  is configured to transmit rotation of the crank  32  through, for example, a chain, a belt, or a shaft, to a rear rotation body  38  coupled to the rear wheel  30 . The rear rotation body  38  includes a sprocket, a pulley, or a bevel gear. A one-way clutch (not shown) is provided between the rear rotation body  38  and the rear wheel  30 . The one-way clutch is configured to allow forward rotation of the rear rotation body  38  in case the rear wheel  30  rotates forward and restrict rearward rotation of the rear rotation body  38  in case the rear wheel  30  rotates rearward. The front rotation body  36  can include a plurality of front sprockets. The rear rotation body  38  can include a plurality of rear sprockets. The crankshaft  32 A can be included in the bicycle component  40 . 
     As shown in  FIG.  2   , the component mounting portion  22 D is connected to the frame  22  at each of the lower end of the down tube  22 C, the lower end of the seat tube  22 E, and the front end of the chain stay  22 G. The component mounting portion  22 D is configured to accommodate at least part of the bicycle component  40 . Preferably, the component mounting portion  22 D is formed integrally with the down tube  22 C, the seat tube  22 E, and the chain stay  22 G but can be connected through welding, adhesion, or the like. The frame  22  includes a first open portion  23 A to accommodate the bicycle component  40  and the battery  18  in the frame  22 . The first open portion  23 A opens toward the upper side of the bicycle  10 , and is provided over the component mounting portion  22 D, the portion of the seat tube  22 E connected to the component mounting portion  22 D, and the portion of the down tube  22 C connected to the component mounting portion  22 D. The component mounting portion  22 D includes a first side wall  23 D, a second side wall  23 E and a bottom wall  23 F. The first side wall  23 D is located at the right side of the bicycle  10 . The second side wall  23 E is located at the left side of the bicycle  10  (refer to  FIG.  4   ). The bottom wall  23 F is located at the lower side of the bicycle  10 . The first side wall  23 D and the second side wall  23 E are connected to the down tube  22 C, the seat tube  22 E and the chain stay  22 G. The bottom wall  23 F is connected to the lower end of the first side wall  23 D, the lower end of the second side wall  23 E, the down tube  22 C and the chain stay  22 G. The first open portion  23 A includes an opening extending in the side walls  23 D and  23 E of the component mounting portion  22 D to where the crankshaft  32 A is located. Preferably, a cover  23 B (refer to  FIG.  4   ) is attached to the first open portion  23 A. The cover  23 B closes the opening of the first open portion  23 A. The bottom wall  23 F of the component mounting portion  22 D includes a second open portion  23 C (refer to  FIG.  6   ). The bicycle component  40  is inserted into the opening of the first open portion  23 A from the upper side and mounted on the frame  22 . The second open portion  23 C includes an opening that extends in the widthwise direction of the bicycle  10 , for example, to the first side wall  23 D and the second side wall  23 E. 
     The battery  18  includes one or more battery cells. The battery cells include rechargeable batteries. The battery  18  is mounted on the bicycle  10  to supply the bicycle component  40  with electrical power. The battery  18  is accommodated in the frame  22 . Preferably, the battery  18  is accommodated in the down tube  22 C. 
     At least part of the bicycle component  40  is arranged inside the frame  22 . The bicycle component  40  of the present embodiment is located in the interior of the component mounting portion  22 D. One end of the bicycle component  40  is provided in the part of the component mounting portion  22 D connected to the seat stay  22 F and the chain stay  22 G. The other end of the bicycle component  40  is connected to the battery  18 . The bicycle component  40  and the battery  18  are aligned in the longitudinal direction of the down tube  22 C. 
     As shown in  FIGS.  3  to  5   , the bicycle component  40  includes a housing  42  and a first mounting portion  44 . The first mounting portion  44  is configured to mount the housing  42  on the bicycle  10 . The bicycle component  40  further includes a second mounting portion  46  that is configured to mount the housing  42  on the frame  22  of the bicycle  10 . The housing  42  supports the crankshaft  32 A of the bicycle  10 . The housing  42  includes a support  54  that supports the crankshaft  32 A. The housing  42  accommodates at least part of a motor  48 . The two axial ends of the crankshaft  32 A each project out of the housing  42 . 
     The motor  48  is provided on the housing  42 . In this embodiment, the motor  48  is provided in the housing  42 . The housing  42  is configured so that it can be at least partially accommodated in the frame  22 . The motor  48  is included in the bicycle component  40 . The motor  48  is configured to assist in propulsion of the bicycle  10 . The motor  48  includes an electric motor. The motor  48  is a brushless motor. The bicycle component  40  includes a reduction gear  50  and an electronic controller  52 . The reduction gear  50  reduces the speed of the rotation generated by the motor  48  and then outputs the rotation. In one example, the motor  48  includes an output shaft of which axial direction is orthogonal to the axial direction of the crankshaft  32 A. Preferably, in this case, the reduction gear  50  converts the rotation of the output shaft of the motor  48  to rotation in a direction orthogonal to the output shaft of the motor  48 . The axis of the output shaft of the motor  48  can be orthogonal to or offset from the axis of the crankshaft  32 A. The reduction gear  50  can include, for example, bevel gears. The reduction gear  50  can further include a planetary gear mechanism. The reduction gear  50  outputs the rotation of the motor  48  to the output portion  51  that extends around the crankshaft  32 A. The rotation of the motor  48  is transmitted by the reduction gear  50  and the output portion  51  to the front rotation body  36 . 
     The controller  52  includes a substrate and a drive circuit. The drive circuit includes an inverter circuit and controls the power supplied from the battery  18  to the motor  48 . The controller  52  includes at least one processor that executes predetermined control programs. The processor includes, for example, a central processing unit (CPU) or a micro-processing unit (MPU). The controller  52  can include one or more microcomputers. The controller  52  can further include a memory device and a timer. The memory device stores various types of control programs and information used for various types of processing. The memory device is any computer storage device or any computer readable medium with the sole exception of a transitory, propagating signal. For example, the memory device includes a non-volatile memory device and a non-volatile memory device, and can includes a ROM (Read Only Memory) device, a RAM (Random Access Memory) device, a hard disk, a flash drive, etc. 
     The housing  42  includes a first accommodation portion  56  and a second accommodation portion  58 . The first accommodation portion  56  includes a cylindrical part. The first accommodation portion  56  accommodates the motor  48 , a part of the reduction gear  50  and the controller  52 . Preferably, one longitudinal end  56 A of the first accommodation portion  56  is provided with an electric terminal that electrically connects the battery  18  and the controller  52 . Preferably, the second accommodation portion  58  is disc-shaped as viewed in the axial direction of the crankshaft  32 A. The second accommodation portion  58  is connected to the other end  56 B in a longitudinal direction of a first housing  60 . The first accommodation portion  56  can be formed integrally with or separately from the second accommodation portion  58 . At least part of the first accommodation portion  56  can be formed integrally with at least part of the second accommodation portion  58 . The support  54  is provided in the second accommodation portion  58 . The support  54  rotatably supports the crankshaft  32 A. 
     As shown in  FIGS.  3  and  7   , the housing  42  is formed by the first housing  60  and a second housing  62 . The first housing  60  includes one of the side surfaces of the housing  42  in the axial direction of the crankshaft  32 A. The second housing  62  includes the other one of the side surfaces of the housing  42  in the axial direction of the crankshaft  32 A. The first housing  60  and the second housing  62  are joined to form an accommodation space inside the housing  42 . The first housing  60  and the second housing  62  are fixed to each other by, for example, a plurality of bolts. 
     The bicycle component  40  further includes a first bearing  64 A, a second bearing  64 B, a first one-way clutch  66 A and a second one-way clutch  66 B. The first bearing  64 A is provided between the first housing  60  and the crankshaft  32 A to support the crankshaft  32 A rotatably relative to the first housing  60 . The second bearing  64 B is provided between the second housing  62  and the output portion  51  to support the output portion  51  rotatably relative to the second housing  62 . The first bearing  64 A and the second bearing  64 B are spaced apart from each other in the axial direction of the crankshaft  32 A. The first bearing  64 A is provided near the end of the housing  42  at one side in the axial direction of the crankshaft  32 A. The second bearing  64 B is provided near the end of the housing  42  at the other side in the axial direction of the crankshaft  32 A. 
     The output portion  51  is coaxial with the crankshaft  32 A. The output portion  51  is cylindrical. The output portion  51  covers part of the outer circumferential surface of the crankshaft  32 A. The output portion  51  projects out of the housing  42  at the other side in the axial direction of the crankshaft  32 A. The end of the crankshaft  32 A at the other side in the axial direction extends from the output portion  51  toward the other side in the axial direction of the crankshaft  32 A. 
     The first one-way clutch  66 A is provided between the crankshaft  32 A and the output portion  51 . The first one-way clutch  66 A is provided near the end of the output portion  51  at one side in the axial direction of the crankshaft  32 A. Part of the first one-way clutch  66 A can be formed integrally with at least one of the crankshaft  32 A or the output portion  51 , or both. For example, the first one-way clutch  66 A includes a roller clutch. In this case, the inner race of the first one-way clutch  66 A can be formed integrally with the crankshaft  32 A, and the outer race of the first one-way clutch  66 A can be formed integrally with the output portion  51 . 
     A third bearing  64 C is provided between the crankshaft  32 A and the end of the output portion  51  at the other side in the axial direction of the crankshaft  32 A. The third bearing  64 C includes, for example, a sleeve or a needle bearing. The crankshaft  32 A is supported by the second bearing  64 B through the third bearing  64 C and the output portion  51 . Preferably, at least parts of the second bearing  64 B and the third bearing  64 C are located at overlapping positions in a direction orthogonal to the crankshaft  32 A. 
     The first one-way clutch  66 A transmits rotation in a first rotation direction of the crankshaft  32 A to the output portion  51 , and does not transmit rotation in the first rotation direction of the output portion  51  to the crankshaft  32 A. The second one-way clutch  66 B is provided between the output portion  51  and a gear  51 A for connecting the output portion  51  and the reduction gear  50 . The second one-way clutch  66 B transmits rotation in a first rotation direction of the motor  48  to the output portion  51 , and does not transmit rotation in the first rotation direction of the output portion  51  to the motor  48 . The first rotation direction of the crankshaft  32 A is the direction in which the crankshaft  32 A is rotated when the bicycle  10  is being moved forward. The first rotation direction of the output portion  51  is the direction in which the output portion  51  is rotated when the bicycle  10  is being moved forward. The first rotation direction of the motor  48  is the direction of the rotation of the motor  48  in a case in which the motor  48  moves the bicycle  10  forward. The output portion  51  and the housing  42  are provided with a torque sensor (not shown) that detects the rotation force transmitted to the output portion  51 . The torque sensor includes, for example, a strain sensor or a magnetostrictive sensor. The controller  52  controls the motor  48  in accordance with the output of the torque sensor. 
     As shown in  FIG.  4   , the housing  42  is configured to be at least partially accommodated in the frame  22 . More specifically, the housing  42  is configured so that at least part of the first accommodation portion  56  is accommodated in the part of the component mounting portion  22 D at the side connected to the down tube  22 C and so that the second accommodation portion  58  is accommodated in the part of the component mounting portion  22 D at the side connected to the seat tube  22 E and the chain stay  22 G. Preferably, the housing  42  is mounted on the frame  22  so that the rotation axis of the motor  48  extends in the longitudinal direction of the down tube  22 C. The part of the component mounting portion  22 D accommodating the first accommodation portion  56  can be included in the down tube  22 C. 
     As shown in  FIGS.  4  and  7   , the first mounting portion  44  includes a first member  68  and a second member  70 . The first mounting portion  44  is provided on the housing  42  independently from the support  54 . The first mounting portion  44  and the second mounting portion  46  are spaced apart from each other in a predetermined direction. The predetermined direction is parallel to the axial direction C of the crankshaft  32 A. The first mounting portion  44  is provided on a first side surface  42 X of the housing  42  in the axial direction C of the crankshaft  32 A. The second mounting portion  46  is provided on a second side surface  42 Y of the housing  42  at the opposite side of the first side surface  42 X in the axial direction C of the crankshaft  32 A. The first side surface  42 X includes one of the side surfaces of the second accommodation portion  58  in the axial direction C of the crankshaft  32 A. The second side surface  42 Y includes the other one of the side surfaces of the second accommodation portion  58  in the axial direction C of the crankshaft  32 A. 
     The first member  68  is ring-shaped. Further, the first member  68  includes a first hole  68 A extending in a first direction. The first hole  68 A includes a through hole through which the crankshaft  32 A extends. The first member  68  includes a through hole. The first direction coincides with the axial direction C of the crankshaft  32 A. The first member  68  includes a male thread  68 B. The male thread  68 B is formed on the outer circumferential portion of the first member  68 . The first member  68  is configured to support the housing  42  in a direction intersecting the first direction and the axial direction C of the crankshaft  32 A. The housing  42  includes an insertion portion  42 A inserted into the first hole  68 A of the first member  68 . Preferably, the insertion portion  42 A is included in the support  54 . The first member  68  includes an inner circumferential portion  68 D that supports the insertion portion  42 A. Preferably, the part of the first member  68  into which the insertion portion  42 A is inserted has an inner diameter that is slightly larger than the outer diameter of the insertion portion  42 A. 
     The second member  70  is ring-shaped. At least part of the second member  70  is provided between the housing  42  and the frame  22 . At least part of the second member  70  is provided between the first member  68  and the frame  22 . The second member  70  is configured to contact part of the frame  22  in a direction intersecting the first direction and the axial direction C of the crankshaft  32 A. The second member  70  contacts the second side wall  23 E of the component mounting portion  22 D. The second member  70  includes a hole  70 A extending in the first direction. Further, the second member  70  includes a female thread  70 B joined with the male thread  68 B of the first member  68 . The female thread  70 B is formed on the inner circumferential portion of the second member  70 . As shown in  FIG.  8   , the second member  70  includes a side surface  70 D that defines a frame engagement portion  70 E. The frame engagement portion  70 E includes a plurality of projections  70 F projecting in the axial direction of the crankshaft  32 A. The projections  70 F are arranged in intervals in the circumferential direction of the crankshaft  32 A. The frame  22  includes a plurality of recesses  22 X corresponding to the projections  70 F of the frame engagement portion  70 E. The projections  70 F of the frame engagement portion  70 E are fitted into the recesses  22 X of the frame  22  to restrict rotation of the second member  70  about its center axis relative to the frame  22 . The ends of the projections  70 F can be linked in a ring-shaped manner at the inner circumferential side of the second member  70 . 
     The first member  68  is configured to press the housing  42 . More specifically, the first member  68  is configured to be coupled with the second member  70 . The first member  68  has a first end surface  68 C that presses the housing  42  in the first direction under the force of the second member  70 . The second member  70  is configured to press the frame  22 . More specifically, the parts in the side surface  70 D of the second member  70  between the projections  70 F are configured to contact the part of the frame  22  faced toward the second side surface  42 Y of the housing  42 . 
     At least one of the first member  68  or the second member  70 , or both includes a tool engagement portion  72  that is engageable with a tool. Preferably, the tool engagement portion  72  is defined by at least one of the inner circumferential portion  68 D or an outer circumferential portion  68 E of the first member  68 , or both. In the present embodiment, the tool engagement portion  72  is defined by the inner circumferential portion  68 D of the first member  68 . The tool engagement portion  72  includes a plurality of recesses and a plurality of projections. The projections project in the radial direction of the crankshaft  32 A. The projections and the recesses are alternatively arranged at predetermined intervals in the circumferential direction around the crankshaft  32 A. The projections and the recesses are formed in the inner circumferential portion  68 D of the first member  68 . 
     As shown in  FIGS.  5  and  7   , the second mounting portion  46  includes a threaded hole  42 B and a first coupling member  74 . The threaded hole  42 B is formed in the housing  42 . The first coupling member  74  is ring-shaped. The first coupling member  74  includes a hole  74 A extending in the first direction. The first coupling member  74  is extended through the frame  22  and coupled to the threaded hole  42 B. The first coupling member  74  extends through the first side wall  23 D of the component mounting portion  22 D. The threaded hole  42 B includes a female thread. The first coupling member  74  includes a male thread  74 B joined with the female thread of the threaded hole  42 B. The outer circumferential portion of the first coupling member  74  includes a part where the male thread  74 B is formed and a side wall  74 C extending outward in the radial direction from the part where the male thread  74 B is formed. The first coupling member  74  corresponds to a coupling member that is extended through the frame  22  and coupled to the threaded hole  42 B. The side wall  74 C is configured to sandwich the frame  22  with the housing  42 . Preferably, at least one of the outer circumferential portion or the inner circumferential portion of the side wall  74 C, or both defines a tool engagement portion that is engageable with a tool. The tool engagement portion includes, for example, a plurality of recesses and a plurality of projections shaped to be recessed or projected in the radial direction of the first coupling member  74 . The threaded hole  42 B can include a male thread instead of a female thread. In this case, the male thread on the outer circumferential portion of the first coupling member  74  is omitted, and a female thread joined with the threaded hole  42 B is formed in the inner circumferential portion of the first coupling member  74 . 
     Preferably, the bicycle component  40  further includes a third mounting portion  76  that is configured to mount the housing  42  on the frame  22 . As shown in  FIG.  6   , the third mounting portion  76  is provided on the housing  42  in a direction intersecting the axial direction of the crankshaft  32 A. The third mounting portion  76  includes threaded holes  78  and second coupling members  80 . The threaded holes  78  are formed in the housing  42 . The second coupling members  80  are extended through the frame  22  and coupled to the threaded holes  78 . The second coupling members  80  include bolts. The second coupling members  80  can be configured including a plurality of threaded holes and a plurality of bolts. Preferably, in this case, the threaded holes are located at intervals in the axial direction of the crankshaft  32 A. 
     As shown in  FIG.  9   , the first mounting portion  44  is configured to apply force to the housing  42  and the frame  22  acting to move the housing  42  and the frame  22  away from each other. The first mounting portion  44  is configured to apply force to the housing  42  and the frame  22  acting to move the housing  42  and the frame  22  away from each other in the axial direction C of the crankshaft  32 A. More specifically, the first member  68  presses the housing  42  with the first end surface  68 C to apply force to the housing  42  acting toward the second mounting portion  46  in direction A 1 . The second member  70  applies force with the axial force of the second member  70  to the frame  22  acting in direction A 2 , which is opposite to direction A 1 . 
     The second mounting portion  46  is configured to apply force to the housing  42  and the frame  22  acting to move the housing  42  and the frame  22  toward each other. The second mounting portion  46  is configured to apply force to the housing  42  and the frame  22  acting to move the housing  42  and the frame  22  toward each other in the axial direction C of the crankshaft  32 A. More specifically, the first coupling member  74  applies force with the axial force of the first coupling member  74  to the housing  42  acting in direction B 1  toward the frame  22 . The first coupling member  74  applies force with the first coupling member  74  to the frame  22  acting in direction B 2 , which is opposite to direction B 2 . 
     In the housing  42 , the first housing  60  is pressed toward the second housing  62 . This restricts separation of the portions joining the first housing  60  and the second housing  62 . Thus, deformation and the formation of a gap are limited in the housing  42 . 
     Second Embodiment 
     A bicycle component  40  in accordance with a second embodiment will now be described with reference to  FIG.  10   . The bicycle component  40  in accordance with the second embodiment differs from the bicycle component  40  in accordance with the first embodiment only in the position where the bicycle component  40  is mounted on the frame  22 . Otherwise, the bicycle component  40  in accordance with the second embodiment is the same as the bicycle component  40  in accordance with the first embodiment. Thus, same reference numerals are given to those components that are the same as the corresponding components of the first embodiment. Such components will not be described in detail. In the present embodiment, at least part of the first accommodation portion  56  of the housing  42  is accommodated in the seat tube  22 E. 
     As shown in  FIG.  10   , the first accommodation portion  56  of the housing  42  is accommodated in at least part of the seat tube  22 E, and the second accommodation portion  58  of the housing  42  is accommodated in the component mounting portion  22 D. The frame  22  includes a first open portion  90 A to accommodate the bicycle component  40  in the frame  22 . The first open portion  90 A is provided over the component mounting portion  22 D, the portion of the seat tube  22 E connected to the component mounting portion  22 D, and the portion of the down tube  22 C connected to the component mounting portion  22 D. The first open portion  90 A is open toward the front and upper sides of the bicycle  10 . Preferably, a cover (not shown) is attached to the first open portion  90 A. The cover closes the opening of the first open portion  90 A. 
     At least part of the bicycle component  40  is arranged inside the frame  22 . At least part of the bicycle component  40  in accordance with the present embodiment is arranged inside the seat tube  22 E. More specifically, part of the first accommodation portion  56  is accommodated in the seat tube  22 E, and the second accommodation portion  58  is accommodated in the component mounting portion  22 D. Preferably, the outer circumference of the second accommodation portion  58  is provided with an electric terminal connected to the controller  52  (refer to  FIG.  3   ). The electric terminal on the outer circumference of the second accommodation portion  58  is connected to the battery  18 , which is located inside the down tube  22 C. The housing  42  is mounted on the frame  22  so that the rotation axis of the motor  48  substantially extends in the longitudinal direction of the seat tube  22 E. 
     Modifications 
     The description related with the above embodiment exemplifies, without any intention to limit, an applicable form of a bicycle component according to the present disclosure. In addition to the embodiments described above, the bicycle component according to the present disclosure is applicable to, for example, modifications of the above embodiments that are described below and combinations of at least two of the modifications that do not contradict each other. In the modifications described hereafter, same reference numerals are given to those components that are the same as the corresponding components of the above embodiment. Such components will not be described in detail. 
     The second mounting portion  46  of the first and second embodiments can be changed to a second mounting portion  104  shown in  FIG.  11   . The second mounting portion  104  includes a plurality of threaded holes  106  and a plurality of the first coupling members  108 . The threaded holes  106  are formed in the housing  42 . The first coupling members  108  are bolts. The first coupling members  108  are extended through the frame  22  and coupled to the threaded holes  106 . The first coupling members  108  include male threads joined with female threads of the threaded holes  106 . The threaded holes  106  and the first coupling members  108  are arranged at intervals around the crankshaft  32 A. 
     As shown in  FIGS.  12  and  13   , in the first embodiment, instead of the first open portion  23 A, the frame  22  can include a first open portion  23 G that opens toward the lower side of the bicycle  10 . The first open portion  23 G is provided over the lower part of the component mounting portion  22 D and the portion of the down tube  22 C connected to the component mounting portion  22 D. The bicycle component  40  is inserted into the opening of the first open portion  23 G from the lower side and mounted on the frame  22 . The opening of the first open portion  23 G extends in the side walls  23 D and  23 E of the component mounting portion  22 D from where the crankshaft  32 A is provided. Preferably, a cover (not shown) is attached to the first open portion  23 G. 
     As shown in  FIG.  14   , in the modification of  FIGS.  12  and  13   , the first coupling member  74  can be replaced by the first coupling members  108 . In the modification shown in  FIG.  14   , the first mounting portion  44  can be modified to have the same structure as the second mounting portion  46 . 
     In the first embodiment, the second embodiment, and the modification of the first embodiment shown in  FIGS.  12  and  13   , the second mounting portion  46  can be modified to have the same structure as the first mounting portion  44 . 
     In the first embodiment, the second embodiment, and the modification of the first embodiment shown in  FIGS.  12  and  13   , the first mounting portion  44  can be modified to have the same structure as the second mounting portion  46 . 
     In the first embodiment, the second embodiment, and the modification of the first embodiment shown in  FIGS.  12  and  13   , the first mounting portion  44  can be replaced by the second mounting portion  104  shown in  FIG.  11   . 
     In the first embodiment, the second embodiment, and their modifications, the first coupling member  74  can be shaped to have the form of a non-continuous ring. For example, the first coupling member  74  can be C-shaped. 
     In the first embodiment, the second embodiment, and their modifications, at least one of the first member  68  or the second member  70 , or both can be shaped to have the form of a non-continuous ring. For example, the first member  68  and the second member  70  can be C-shaped. In the first embodiment, the second embodiment, and their modifications, the projections  70 F can be omitted from the second member  70 . In this case, the recesses  22 X can be omitted from the frame  22 . 
     A transmission can be provided in the housing  42  of the bicycle component  40  in lieu of or in addition to the motor  48 . In this case, the housing  42  can accommodate at least part of the transmission. The transmission changes the speed of the rotation input to the crankshaft  32 A and outputs the rotation to the front rotation body  36 . 
     In each of the embodiments and modifications, the locations of the first mounting portion  44  and the second mounting portions  46  and  104  can be changed. For example, the first mounting portion  44  can be located in the housing  42  at the side of the second side surface  42 Y, and the second mounting portions  46  and  104  can be located in the housing  42  at the side of the first side surface  42 X. 
     In each of the embodiments and the modifications, a structure similar to that of the first mounting portion  44  can be provided at the side of the second side surface  42 Y. In this case, the second mounting portions  46  and  104  can be omitted. 
     In each of the embodiments and the modifications, the first mounting portion  44  can be modified to a structure similar to that of the second mounting portion  46 . For example, a first mounting portion  110  shown in  FIG.  15    is configured to sandwich the frame  22  with the housing  42  in the axial direction C of the crankshaft  32 A. The first mounting portion  110  includes a first part  112  and a second part  114 . The housing  42  includes a female thread  42 C. The first part  112  is configured to be joined with the housing  42 . The first part  112  has an inner circumferential surface that defines a through hole  112 A and an outer circumferential surface that includes a male thread  112 B joined with the female thread  42 C. The second part  114  extends outward in the radial direction of the crankshaft  32 A from the first part  112  and is configured to press the frame  22 . The first mounting portion  110  further includes a tool engagement portion  116  that is engageable with a tool. The tool engagement portion  116  is defined by, for example at least one of the inner circumference of the first part  112  or the outer circumference of the second part  114 , or both. 
     The modification of  FIG.  15    can be modified as shown in  FIG.  16   . In  FIG.  16   , a first mounting portion  110 A includes a first part  118 . The first part  118  includes a female thread  118 B joined with a male thread  42 D of the first part  118 . The first mounting portion  110 A is configured to sandwich the frame  22  with the housing  42  in the axial direction C of the crankshaft  32 A. The first mounting portion  110 A includes the first part  118  and the second part  114 . The housing  42  includes the male thread  42 D. The first part  118  is configured to be joined with the housing  42 . The first part  118  includes an inner circumferential surface, which defines a through hole, and an outer circumferential surface. The inner circumferential surface defining the through hole includes a female thread  182 B joined with the male thread  42 D.