KR19990085031A - Bicycle with motor and reducer integrated in hub - Google Patents

Abstract

The present invention provides a bicycle in which a motor and a reducer are integrated in the hub.

The bicycle is provided with a motor (M) and a reduction gear (G) for driving the bicycle by electric power: a motor case (10) in which a stator (13 ') of the motor (M) is provided at an inner circumference; A reducer case 20 for coupling with the motor case 10 to form a case of the motor M and the reducer G; Hub shafts 30 each of which is supported at both ends of the motor case 10 and the reduction gear case 20 so as to be rotatably supported through bearings 1 and 2; And it is hollow so that the rotor 40 'of the motor M is installed in the motor case 10 is rotatably inserted on one side of the hub shaft 30 via the bearing (3,4) and the outer periphery It is formed as a shaft, characterized in that it comprises a rotor hollow rotating shaft 40 having a protruding end connected to the reducer (G) by protruding from the rotor (40 ') to the reducer case 20 side. .

As a result, the motor and the reducer can be compactly integrated in the hub of the front wheel or the rear wheel, which can be miniaturized, the reduction ratio is high, the balance of the entire hub equipped with the motor can be achieved, and the pedal can be used. .

Description

Bicycle with motor and reducer integrated in hub

The present invention relates to a bicycle that can be driven by a motor, and more specifically, it can be miniaturized by integrating the motor and the reducer compactly in the hub of the front wheel or the rear wheel, the reduction ratio is high, and the balance of the whole hub equipped with the motor The present invention relates to a bicycle in which a motor and a reducer are integrated in a hub, which can be used and a pedal can be used.

Conventionally, bicycles that can be driven by an electric motor are generally connected to the crankshaft of the pedal and rotate the crankshaft, and even when the geared motor is installed separately, it is not formed integrally with the hub and separate power transmission means It was necessary.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and can be miniaturized by compactly integrating a motor and a reducer in a hub of a front wheel or a rear wheel, has a high reduction ratio, and can balance the entire hub equipped with a motor. It is an object of the present invention to provide a bicycle in which a motor and a reducer are integrated in a hub, which can also use a pedal.

1 is a top plan view of a bicycle in which a tire and a rim of a front wheel and a rear wheel are removed and a motor and a reducer are integrated in the rear wheel hub according to an embodiment of the present invention;

2 is a cross-sectional view taken along line 2-2 of FIG. 1;

3 is an exploded perspective view of FIG. 2;

4 is a cross-sectional view taken along the line 2-2 of FIG. 1 showing another embodiment of FIG.

** Explanation of symbols on main parts of the drawing **

1,2,3,4,5,6,7: Bearing 2 ', 3', 4 ': Oil seal

10: motor case 10 ': battery

11: bearing part 12: brush part

12 ': Brush 12 ": Motor Wiring

13: motor part 13 ': stator

14: cylinder 14 ': fixing bolt

14 ": Nut 14a: Stem

14b: tightening screw part 15: separating plate

16: Frame fixing bracket 16 ': Support bolt

16 ": Nut 20: Reducer Case

21: bearing portion 22: side wall portion

23: coupling portion 30: hub shaft

31: protruding flange 32: inclined portion

33: Tightening screw part 34: Frame mounting protrusion

34 ': fixed bolt 40: rotor hollow shaft

40 ': rotor 41: first sun gear

50, 51: first planetary gear 52: first fixed internal ring gear

53: spacer ring 54: first inner race

55: connecting pin 56: second sun gear

60, 61: 2nd planetary gear 62: 2nd fixed internal ring gear

64: 2nd inner race 66: annular protrusion flange

66 ': first one-way clutch bearing 70: hub wheel

70 ': fixing nut 71: cylindrical part

72: left spoke flange 72 ': left spoke mounting hole

73: side wall portion 73 ': first right spoke mounting hole

73a: right spoke embossing 73b: second right spoke mounting hole

74: hub shaft coupling boss 75: tightening thread

80,122: Chain Sprocket 80 ': 2nd one-way clutch bearing

81: fixing nut 101: left frame

102: frame connection 103: buffer packing

105: right frame 106: frame connection

107: bearing case portion 120: pedal

121: crankshaft 120 ': chain

In order to achieve the above object, a bicycle in which a motor and a reducer are integrated in a hub according to an embodiment of the present invention includes a motor and a reducer for driving a bicycle by electric power. A motor case installed; A reducer case coupled to the motor case to form a case of a motor and a reducer; Hub shafts each of which is rotatably supported through a bearing in the motor case and the reducer case; And a hollow shaft that is rotatably inserted on one side of the hub shaft in the motor case via a bearing and is installed on the outer circumference so that a rotor of the motor is installed, protrudes from the rotor toward the reducer case and is connected to the reducer. It characterized in that it comprises a rotor hollow rotating shaft having a protruding end. In this way, the motor can be miniaturized by installing a motor on the hub shaft by the rotor hollow rotating shaft. The motor and the reducer may be installed on any one of the front wheel and the rear wheel.

In addition, a first sun gear is formed at the protruding end of the rotor hollow rotating shaft, and in this case, the reducer engages with the first sun gear and engages with a first fixed internal ring gear to which rotation is fixed. The first planetary gear is connected to the center of rotation of the first planetary gear through a connecting pin, and rotates together with the revolution of the first planetary gear through a bearing on the hub shaft, and the center portion protrudes to form a second sun gear. And a second planetary gear that rotates and rotates by engaging a first inner race formed on the outer periphery, a second fixed internal ring gear engaged with the second sun gear and fixed in rotation, and a rotation center of the second planetary gear. It is connected via a connecting pin to the rotation through the bearing of the second planetary gear via the bearing on the hub shaft, the annular projection flange protruding annularly near the center portion Generated by being configured to include a second inner race and to obtain a high reduction ratio, it is possible to compactly configure the speed reducer.

In the above-described structure, the hub wheel on which the plurality of spokes is installed is connected to the inner circumference of the annular protrusion flange of the second inner race via the first one-way clutch bearing for transmitting rotational power in one direction. A protruding flange coupled to the inner circumference of the way clutch bearing is formed on the hub shaft, inserted into an inclined portion formed on the other side of the hub shaft, and fixedly mounted by a fastening screw portion and a fixing nut formed on the hub shaft to rotate together with the hub shaft. And a side wall portion extending from the hub shaft coupling boss, and a cylindrical portion extending from the side wall portion to surround the outer circumference toward the motor case.

A fastening screw portion is formed on the outer circumference of the hub shaft coupling boss of the hub wheel, and is provided on the outer circumference of the flange screw block and the flange screw block screwed to the fastening screw portion via a second one-way clutch bearing, By further comprising a rear chain sprocket which is prevented from being separated, the pedal can be driven as needed when the power of the battery is weakened.

A frame fixing bracket for mounting a frame may be formed on the outer circumference of the motor case, and a frame mounting protrusion having a screw hole formed on a central axis is formed to extend from an end of the hub shaft, and the hub shaft is formed through a bearing and a bearing flange. The frame may be mounted to the frame mounting protrusion of the hub shaft so as to be rotatable.

An oil seal is installed between the hub shaft and the rotor hollow rotating shaft, and a separation plate and an oil seal are installed to fluidly separate the space in which the reducer is installed and the space in which the motor is installed, and the motor case and the hub shaft. The oil seal may be installed between the hub shaft coupling bosses of the hub wheel to prevent oil from leaking in the reducer.

In the fixed structure of the first fixed internal ring gear and the second fixed internal ring gear, the motor case and the reduction gear case may be connected to a fixing bolt having a stem portion in between and a nut fastened to a fastening screw portion of an end of the fixed bolt. The U-shaped protruding groove coupled to the stem part of the fixing bolt and fixed to the outer circumference of the first fixed inner ring gear and the second fixed inner ring ring gear can be compactly installed.

In addition, in the spoke mounting structure, a pair of spoke flanges each formed with a plurality of spoke mounting holes may be installed on the outer circumferential ends of the cylindrical portion of the hub wheel so that a plurality of spokes are inserted and fixed in opposite directions to each other. Only the free end of the cylindrical spokes is provided with a left spoke flange formed with a plurality of spoke mounting holes left in the opposite direction of the plurality of spokes are installed, the right side of the spokes is installed, and the spokes are inserted and fixed by using the side wall of the hub wheel The second right spoke mounting hole formed on the first right spoke mounting hole and the right spoke embossing may be constituted. Thus, by forming the right spoke embossing to form the second right spoke mounting hole, it is possible to balance the tension of the spot installed at the intersection and the balance of the tire and the balance of the weight of the passengers acting on the dynamic balance of the entire hub and the frame. It can be planned.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the embodiments of the present invention.

1 shows a bicycle in which the tire and the rim of the front and rear wheels are removed and the motor and the reducer are integrated in the rear wheel hub according to one embodiment of the present invention as a top plan view, and FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. As shown in FIG. 3, a hub and a speed reducer are integrated, and an exploded perspective view of the hub is illustrated in FIG. 3.

In FIG. 1, the bicycle in which the motor and the reducer are integrated in the hub of the present invention is illustrated as being integrated in the hub of the rear wheel. That is, the above-described reduction gear case 20 is built in the hub wheel 70 of the rear wheel in FIG. 1, and the motor case 10 is installed at one side of the hub wheel 70 together with the motor M and the chains at the other side. The plaquette 80 is installed and connected to the front chain sprocket 122 by the chain 120 'so that it can be driven by the pedal 120 and the crankshaft 121, and the saddle (not shown) It can also be driven by the motor M by receiving current from the storage battery 10 'installed in the lower portion via the motor wiring 12 ". The motor M is preferably a DC motor, and its on / off. Although not shown for control or intermittent or continuous speed control or torque control, conventional motor control systems may be used between the motor M and the battery 10 '.

2 and 3 of the bicycle in which the motor and the reducer are integrated in the hub of the present invention, the motor case 10 and the reducer case 20 are combined to form a case of the motor M and the reducer G, The rotor hollow rotating shaft 40 is inserted in the case so as to overlap one side (left side) of the hub shaft 30 so that the motor M is installed and the reduction gear G is installed at the center of the hub shaft 30. It is configured to be integrated with the hub.

The motor case 10 has a stator 13 'of the motor M installed in the inner circumference thereof, and the reducer case 20 is coupled to the motor case 10 by a fixing bolt 14' so that the motor M ) And a case of the reducer (G).

As a specific example, as shown in FIG. 2 and FIG. 3, the motor case 10 includes a bearing part 11 for receiving a bearing 1 at one end of the hub shaft 30 and a motor wiring 12 to the outside. A protruding part and a brush part 12 on which the brush 12 'for the rotor 40' is installed, a motor part 13 on which the rotor 40 'and the stator 13' are accommodated, The reducer (G) is composed of a cylindrical portion 14 installed therein may be formed in a multi-stage shell shape, the reducer case 20 on the right side as shown, the bearing portion 21 in a simple shape without a stage. , A side wall part 22 and a coupling part 23. A frame fixing bracket 16 for mounting the left frame 101 may be formed on an outer circumference of the motor case 10.

The hub shaft 30 is a bearing portion of the motor case 10 and the reducer case 20 (

11 and 21 are rotatably supported at both ends via bearings 1 and 2. In addition, the hub shaft 30 may be provided with a rear chain sprocket 80 on the right side, specifically, the fastening screw portion 75 on the outer circumference of the hub shaft coupling boss 74 of the hub wheel 70. ) Is formed and installed on the outer periphery of the flanged screw block 83 and the flanged screw block 83 screwed to the fastening screw portion 75 via a second one-way clutch bearing 80 'and a fixed nut ( 81) can be configured to prevent the departure.

In addition, the frame mounting protrusion 34 having a screw hole formed on the central axis is extended from the other end (right side) of the hub shaft 30 so that the hub shaft 30 is interposed between the bearing 7 and the bearing flange 107. The frame connecting portion 106 of the right frame 105 can be mounted to the frame mounting protrusion 34 of the hub shaft 30 so as to rotate.

The rotor hollow rotating shaft 40 is rotatably inserted on one side (left side) of the hub shaft 30 in the motor case 10 via the bearings 3 and 4, and the motor M on the outer circumference thereof. The rotor 40 'is formed of a hollow shaft to be installed. In addition, the rotor hollow rotating shaft 40 protrudes from the rotor 40 'toward the reduction gear case 20 and is provided with a protruding end portion (the first sun gear 41 in the drawing) connected to the reduction gear G. , Which may be formed in various configurations depending on the configuration of the speed reducer G).

2 and 3, the reduction gear G includes the first planetary gears 50 and 51, the first fixed internal ring gear 52, the first inner race 54, the second sun gear 56, and the second planetary planet. Gear 60, 61 and the second fixed internal ring gear 62, in this case, the first sun gear meshing with the first planetary gear (50, 51) at the protruding end of the rotor hollow shaft 40 41 is formed.

The first planetary gears 50 and 51 engage with the first sun gear 41 and engage with the first fixed internal ring gear 52 which is fixed in rotation, thereby causing revolution and rotation, and the first inner race 54. The first planetary gear 50 is connected to the center of rotation of the first planetary gears 50 and 51 via a connecting pin 55 and rotatably installed on the hub shaft 30 via a bearing 5. With the idle of 51, the first deceleration is rotated.

In addition, the center portion of the first inner race 54 protrudes and the second sun gear 56 is formed on the outer circumference to rotate together. The second sun gear 56 is engaged with the second planetary gear 60 and 61 and engaged with the second fixed internal ring gear 62 in which the rotation is fixed. Further, the second planetary gears 60 and 61 are connected to the centers of rotation of the second planetary gears 60 and 61 via connecting pins 55 and via the bearing 6 on the hub shaft 30. The second inner race 64 is configured to rotate with the revolution of, and an annular projection flange 66 protruding annularly near the center portion of the second inner race 64 is formed.

The first one-way clutch bearing 66 is coupled to the inner circumference of the annular protrusion flange 66 of the second inner race 64, and the hub shaft 30 is formed on the inner circumference of the first one-way clutch bearing 66. Protruding flange 31 formed in the is coupled. In addition, between the first sun gear 41 and the first inner race 54 and the second sun gear 56 and the second inner race 64 to reduce the friction of the rotational motion due to the contact therebetween in FIG. As shown, washer-shaped bushings 41 'and 56' may be inserted.

In one example of a coupling structure of the motor case 10 and the reducer case 20, the motor case 10 and the reducer case 20 is a fixed bolt 14 'having a stem portion 14a formed therebetween, and It may be hermetically coupled by a nut 14 "fastened to the fastening screw portion 14b at the end of the fixing bolt 14 '. In this configuration, the stem portion 14a of the fixing bolt 14'. As shown in FIGS. 2 and 3, the U-shaped protruding grooves 52 ′ and 62 ′ of the first fixed internal ring gear 52 and the second fixed internal ring gear 62 are connected to each other to prevent rotation. By installing on the outer circumference, the rotation preventing structure of the first fixed internal ring gear 52 and the second fixed internal ring gear 62 can be easily configured. The first fixed internal ring gear 52 as shown in FIGS. 2 and 3 so that the axial position of the second fixed internal ring gear 62 is kept constant. The second is the fixed inner tooth ring gear spacer ring (53) between (62) can be inserted.

In addition, the hub wheel 70 on which the plurality of spokes 110, 110 ′, 111, 111 ′ are provided includes an integrated hub shaft coupling boss 74, a side wall portion 73, and a cylindrical portion 71. The hub shaft coupling boss 74 is inserted into and coupled to the inclined portion 32 formed on the other side on the hub shaft 30, and is coupled to the fastening screw portion 33 and the fixed nut 70 ′ formed on the hub shaft 30. It is configured to rotate together with the hub shaft 30 by being fixedly mounted. The side wall portion 73 extends from the hub shaft coupling boss 74 and the cylindrical portion 71 extends from the side wall portion 73 to the motor case 10 so as to surround the outer circumference thereof. . In addition, at the free end of the cylindrical portion 71 of the hub wheel 70, a left spoke flange having a plurality of spokes 110 and 110 'having a plurality of left spoke mounting holes 72' inserted and fixed in opposite directions to each other. 72 is provided, and the first right spoke mounting hole 73 'and the right spoke embossing 73a and the plurality of spokes 111 and 111' are inserted into and fixed to the side wall portion 73 of the hub wheel 70. The second right spoke mounting hole 73b is formed. Thus, by forming the right spoke embossing 73a and inserting the intersection spokes, the balance can be achieved by the tension of the spot installed at the intersection with a simple configuration. Furthermore, the balance between the rim and the tire can be achieved and the dynamic balance and frame of the entire hub can be achieved. It is possible to balance the weight of the occupant or the like acting on the vehicle.

On the other hand, in the mounting structure of the spoke, as shown in Figure 4 a plurality of spokes (110, 110 ') at the outer circumferential ends of the cylindrical portion 71 of the hub wheel 70 is inserted into a plurality of intersections in opposite directions to be fixed A pair of spoke flanges 72 may be installed, each of which has a spoke mounting hole 72 ', and the pair of spoke flanges 72 insert steel sheets at the time of die casting of the hub wheel 70 in terms of strength. It is preferable to manufacture.

Moreover, in the oil leakage prevention structure of the reducer G, as shown in FIG. 2 and FIG. 3 as a specific example, the oil seal 3 'between the hub shaft 30 and the rotor hollow rotating shaft 40 is shown. Is installed, the separating plate 15 and the oil seal (4 ') is installed so as to fluidly separate between the space portion in which the reducer (G) is installed and the space in which the motor (M) is installed, the motor case ( 10) and the oil seal 2 'is installed between the hub shaft coupling bosses 74 of the hub shaft 30 to the hub wheel 70, so that oil in the reducer G may not be leaked.

The detailed operation of the bicycle in which the motor and the reducer are integrated in the hub according to the embodiment of the present invention configured as described above will be described with reference to FIGS. 1 to 4.

First, when the power of the storage battery is applied to the motor M, the rotational force decelerated through the above-described reducer G is transmitted to the hub shaft 30 through the first one-way clutch bearing 66 and the hub shaft ( The rotational force of 30 is again transmitted to the spokes and the rims and tires of which the illustration is omitted via the hub wheel 70 so that the bicycle moves forward. However, when the hub wheel 70 rotates faster, such as on a downhill road, it is not transmitted to the hub shaft 30 by the first one-way clutch bearing 66. In addition, since the rotational force of the hub shaft 30 by the motor M is not transmitted to the chain sprocket 80 by the second one-way clutch bearing 80 ', the efficiency of the motor M is increased and the pedal (( 120 can be stabilized.

On the other hand, during the braking operation, it is preferable that the power supply to the motor M be interrupted by a known motor control system (not shown) or mechanical on / off interruption associated with the braking device to ensure efficient braking force. Even during startup, torque and speed may be controlled by a known motor control system, and a plurality of switching means for shifting the mechanically intermittent motor M may be provided.

In addition, when the power is weak or cut off, the rotation force is transmitted to the hub shaft 30 through the second one-way clutch bearing 80 'by rotating the pedal 120, and the hub wheel 70 for forward movement. Even in this case, the rotational force of the hub shaft 30 is interrupted by the first one-way clutch bearing 66, so that the motor M is not rotated, so that manpower efficiency can be achieved. .

According to the configuration and action of the bicycle in which the motor and the reducer are integrated in the hub according to the embodiments of the present invention described above, the rotor hollow rotating shaft 40 is inserted into the hub shaft 30 as a hollow shaft, and the reducer in the center portion. By installing (G), it is possible to construct a lightweight and compact structure, and by combining the reduction gear (G) with sun gear, planetary gear, inner race, and fixed internal ring gear, it is possible to compactly obtain high reduction ratio. By making the structure intermittent by the one-way clutch bearing, the structure is further miniaturized, and the driving efficiency of the motor M to the manpower can be increased.

In addition, according to the present invention, since the motor and the reducer are integrated in the hub, the motor can be miniaturized, thereby making it easier to carry by folding or separating the motor driving bicycle, and furthermore, by removing the chain and the chain sprocket. It can be done.

Claims (5)

In order to drive a bicycle by the electric force provided with the motor M and the reduction gear G: A motor case 10 in which a stator 13 'of the motor M is installed at an inner circumference thereof; A reducer case 20 for coupling with the motor case 10 to form a case of the motor M and the reducer G; Hub shafts 30 each of which is supported at both ends of the motor case 10 and the reduction gear case 20 so as to be rotatably supported through bearings 1 and 2; And The hollow shaft is rotatably inserted on one side of the hub shaft 30 in the motor case 10 via the bearings 3 and 4 and the rotor 40 'of the motor M is installed on an outer circumference thereof. The hub is characterized in that it comprises a rotor hollow rotating shaft 40 having a protruding end connected to the reducer (G) protruding from the rotor (40 ') toward the reducer case (20) Bike with motor and reducer integrated. 2. The motor according to claim 1, wherein the motor (M) and the reducer (G) can be installed in the rear wheel; A first sun gear 41 is formed at the protruding end of the rotor hollow rotating shaft 40; The reduction gear (G) has a first planetary gear (50, 51) that engages and rotates by engaging the first sun gear (41) and the first fixed internal ring gear (52) whose rotation is fixed, and It is connected to the rotation center of the first planetary gear (50, 51) via a connecting pin (55) through the bearing (5) on the hub shaft 30 and the revolution of the first planetary gear (50, 51) The first inner race 54, which rotates together, the center portion protrudes and the second sun gear 56 is formed on the outer circumference thereof, and the second fixed internal ring ring gear that is engaged with the second sun gear 56 and fixed in rotation ( And the second planetary gears 60 and 61 which rotate and rotate by engaging with 62, and are connected to the centers of rotation of the second planetary gears 60 and 61 via the connecting pins 55 and the hub shaft 30 Rotation with the rotation of the second planetary gear (60,61) via the bearing (6) on the), an annular projection flange 66 protruding annularly near the center portion is formed 2 is configured to include an inner race (64); The first one-way clutch bearing 66 is coupled to the inner circumference of the annular projection flange 66 of the second inner race 64 via a first one-way clutch bearing 66 for transmitting rotational power in one direction. A protruding flange 31 coupled to an inner circumference thereof is formed on the hub shaft 30; It is inserted into the inclined portion 32 formed on the other side on the hub shaft 30 and fixedly mounted by the fastening screw portion 33 and the fixing nut 70 'formed on the hub shaft 30 together with the hub shaft 30. A rotating hub shaft engaging boss 74, a side wall portion 73 extending from the hub shaft engaging boss 74, and extending from the side wall portion 73 to the motor case 10 to surround its outer periphery; It comprises a cylindrical portion (71), and has a hub wheel (70) on which a plurality of spokes (110, 110 ', 111, 111') are installed; A fastening screw portion 75 is formed on an outer circumference of the hub shaft coupling boss 74 of the hub wheel 70, and a flange screw block 83 and a flange screw block 83 which are screwed to the fastening screw portion 75. Hub, characterized in that it is provided via the second one-way clutch bearing (80 ') on the outer periphery and further provided with a rear chain sprocket 80 is prevented from being separated by the fixing nut 81 Bike with motor and reducer integrated. The frame fixing bracket (16) for mounting the left frame (101) may be formed on the outer circumference of the motor case (10); A frame mounting protrusion 34 having a screw hole formed on a central axis is formed to extend from the other end of the hub shaft 30, and the hub shaft 30 is rotatable through a bearing 7 and a bearing flange 107. The right frame 105 may be mounted to the frame mounting protrusion 34 of the hub shaft 30; An oil seal 3 ′ is installed between the hub shaft 30 and the rotor hollow rotating shaft 40, and fluidly separates between the space portion in which the reducer G is installed and the space portion in which the motor M is installed. Separator plate 15 and the oil seal (4 ') is installed so that the oil seal (2') between the motor case 10 and the hub shaft coupling boss 74 of the hub shaft 30 to the hub wheel (70). It is configured so that the oil in the reducer G is not leaked by being installed; The motor case 10 and the reducer case 20 are nuts 14 fastened to a fixing bolt 14 'having a stem portion 14a formed therebetween and a fastening screw portion 14b of an end of the fixing bolt 14'. Is coupled to the stem portion 14a of the fixing bolt 14 'to the outer circumference of the first fixed inner ring gear 52 and the second fixed inner ring ring gear 62 The bike is a motor and a reducer integrated in the hub, characterized in that the U-shaped projection groove can be installed. 3. The cylindrical end portion 71 of the hub wheel 70 has a plurality of left spoke mounting holes 72 'formed with a plurality of spokes 110 and 110' inserted into and fixed in opposite directions to each other. The left spoke flange 72 is installed, and the first right spoke mounting hole 73 'and the right spoke embossing are inserted into the side wall portion 73 of the hub wheel 70 so that a plurality of spokes 111 and 111' are inserted into and fixed to each other. A bicycle, in which a motor and a reducer are integrated in the hub, characterized in that 73a and a second right spoke mounting hole 73b are formed. The plurality of spoke mounting holes 72 'are respectively provided at the outer circumferential ends of the cylindrical portion 71 of the hub wheel 70 so that the plurality of spokes 110 and 110' are inserted into and fixed in opposite directions to each other. Bicycle, the motor and the reducer are integrated in the hub, characterized in that a pair of spoke flanges 72 formed.