KR102004600B1 - Bicycle with Electric motor - Google Patents

Abstract

Bicycle having an electric motor of the present invention is provided with a housing in the vehicle body, the electric motor is provided in the inner space, the crank shaft is provided with a rotation is arranged to pass through the housing and the electric motor, the crank shaft through the cover Is provided, surrounds the electric motor with a housing, the motor is provided with a fixed portion, a rotating portion, the rotating portion is provided with a magnet or coil, the first gear is provided at one end of the rotating portion to rotate together The fixing part is provided with a magnet or coil which is not provided in the rotating part, and is arranged to generate rotational force by the action of the magnet and the coil.
A gear combination composed of a plurality of outer gears is provided to mesh with the first gear,
The crankshaft is disposed to penetrate the central portion of at least one gear of the first gear, the rotating part and the gear combination, and the rotational force of the rotor is transmitted to the crankshaft through the first gear and the gear combination. The electric motor is configured to operate when the crankshaft rotates in the direction in which the bicycle moves forward, and the electric motor is configured to not operate when the crankshaft rotates in the direction in which the bicycle moves backward.
According to the bicycle having the electric motor of the present invention, the present invention can minimize the weight and volume due to the simple structure, and can have a very similar appearance to a normal bicycle without an electric motor. In addition, the crankshaft is provided through the electric motor to transmit the rotational power of the motor to the crankshaft with a minimum of loss, and the rotational axis of the motor is integrated with the crankshaft of the bicycle, so the rotational axis of the electric motor is not necessary, and the structure is simple and the size is increased. It is advantageous in minimizing the appearance by minimizing, and the cost competitiveness is improved.

Description

Bicycle with electric motor {Bicycle with Electric motor}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle having an electric motor, and more particularly, to a centrally driven electric bicycle in which an electric motor is provided around a pedal crankshaft.

Conventional bicycles equipped with electric motors are widely used to rotate wheels without rotating shafts by including electric motors inside the hubs of the wheels. However, the rotation of the wheels causes power loss, the road surface and the slopes. Therefore, a sliding phenomenon may occur, and when the motor is cut off and operated, there is a disadvantage in that the motor acts as a load to make the bicycle driver more tired.

In addition, a conventional method of transmitting power to the crankshaft is a method of connecting a gear combination to the shaft of the electric motor and transmitting the rotational force generated from the shaft of the gear combination to the pedal of the bicycle is mainly used. The gear combination is connected to the output shaft of the conventional central drive type motor, and the gear combination is configured to be output to the crankshaft. In this conventional technique, since the output shaft and the crankshaft of the motor are separately required, the configuration is complicated and causes a cost increase, and the size becomes larger, which is disadvantageous for miniaturization, and the force is transmitted from the motor shaft to the shaft of the gear combination. Since the force is transmitted to the crank or wheel hub, there is a lot of force transmission loss. In addition, since the motor and gear combinations are separately configured, the size becomes larger and becomes noticeable when the bicycle is settled.

It is also cited in WO 2010/051681 A1 published in FIG. 1 as an example of a conventional crank motor. In the prior art illustrated in FIG. 1, the rotational force of the rotor 6 of the electric motor is transmitted to the inner gear 13 through the center outer gear 14 and the planetary gear 15, and the inner gear 13 is formed by the first gear. Transfer torque to 1 ratchet (2). The motor configuration of the method of transmitting the rotational force of the electric motor by using the inner gear is also widely used in the method of transmitting power to the wheel built in the hub of the wheel. In addition, the toothed gear is connected to the crankshaft (5) is connected to the sprocket (1). Such a structure has a disadvantage in that the structure is complicated, such as using two ratchets, the inner gear is expensive and heavy, and the rotational force transmission system is complicated, and a lot of loss may occur in the transmission, and the weight is heavy due to the complicated and many parts. There is this.

The present invention has been made to improve such a conventional problem, to minimize the loss of power transmission of the electric motor in a bicycle equipped with an electric motor, to minimize the size of the electric motor is not noticeable when the electric motor is mounted around the crank of the bicycle In order to have a beautiful appearance without. In addition, the structure can be simplified to reduce costs, reduce weight, and even in a bicycle equipped with an electric motor, the gear of the crank and the rear wheel may be freely utilized.

Bicycle having an electric motor for achieving the object of the present invention, the electric motor is provided with a fixed portion, a rotating portion for rotating relative to the fixed portion is provided, a magnet or a coil rotating to the rotating portion is provided, A magnet or a coil not provided in the rotating part is provided, and the magnet acts on the coil to generate rotational force, and a first gear is provided to be coupled to be concentric with the rotating part, and the first gear is provided as an outer gear. And rotate with the rotary part, the crank shaft being rotated so that the crank shaft penetrates the central portion of the first gear and the central portion of the rotating portion, and the crank shaft is also arranged to penetrate the central portion of the fixing portion. Both ends of the crankshaft are coupled to the pedal via a crank arm, and a gear jaw capable of transmitting rotational force. And a plurality of gears, the gear combinations are all provided with outer gears, at least one of the outer gears of the gear combinations is concentrically coupled with the means for rotating in one-way direction, and the first gear Is engaged with at least one gear of the combination to transmit the rotational force of the rotating portion, and the crankshaft penetrates through the center of the means for rotating only in the one-way direction, such that the rotational force of the rotating portion is the first gear and the gear combination; The crankshaft is transmitted to the crankshaft through means for rotating only in the one-way direction, and the crankshaft and the gear combination may rotate when the electric motor operates, but the crankshaft may rotate even when the electric motor does not operate. The gears of the gear combination are characterized in that they do not rotate.

In addition, a bicycle having an electric motor for achieving the object of the present invention is provided with a fixed part in the electric motor, a rotating part is provided with respect to the fixed part is provided, a magnet or a coil rotating in the rotating part is provided, the fixed part Is provided with a magnet or coil which is not provided in the rotating part, is arranged to generate a rotational force by the action of the magnet and the coil, the first gear is provided as an outer gear is coupled to be concentric with the rotating part with the rotating part And a magnetic pole detecting element 47 which detects magnetic poles of the magnet and is fixed to the fixed portion, and a rotating crank shaft is provided to penetrate the electric motor. The crankshaft is also arranged to penetrate the central portion of the rotating part, and the crankshaft is also arranged to penetrate the fixing part. Both ends of the crankshaft are coupled to the crank arm, the end of the crank arm is provided with a pedal, the gear combination for transmitting the rotational force is provided with a plurality of gears, the gear combination is all provided with outer gears, The first gear is engaged with at least one gear of the gear combination to transmit the rotational force of the rotating part, and the crankshaft is also arranged to penetrate the central portion of the at least one outer gear of the gear combination such that the rotational force of the rotor is It is provided to be transmitted to the crankshaft through the first gear and the gear combination, the electric motor is operated when the crankshaft rotates in the direction in which the bicycle advances by the signal of the magnetic pole detection element 47, It does not operate when rotating in the backward direction.

In addition, the bicycle having an electric motor for achieving the object of the present invention at least one gear of the gear combination may further include a second gear, the gear combination further comprises a means for rotating only in one-way direction, The crankshaft may be arranged to penetrate the means for rotating only in the one-way direction. In addition, the crankshaft is further provided with a speed signal generator for indicating the rotational speed, the fixing portion is further provided with an element for detecting the rotational speed of the crankshaft, it characterized in that for detecting the rotational speed of the crankshaft.

The present invention can minimize the weight and volume of a bicycle having an electric motor, and can have a very similar appearance to a normal bicycle without an electric motor. In addition, the crankshaft is provided through the electric motor can transmit the rotational force of the electric motor to the crankshaft to minimize the loss. In addition, since the rotating shaft of the motor is integrated with the crank shaft of the bicycle, there is no need for the rotating shaft of the motor, and the structure is simplified and the size is minimized, which is advantageous for beautiful appearance, light weight, and cost competitiveness is improved.

1 is a schematic configuration diagram of a conventional crank electric motor.
2 is a schematic configuration diagram of a bicycle having an electric motor according to an embodiment of the present invention.
3 is a conceptual diagram of an electric motor according to an embodiment of the present invention.
4 is a schematic configuration diagram of a coil rotary motor according to an embodiment of the present invention.

2 is a conceptual diagram according to an embodiment of a bicycle having an electric motor according to an embodiment of the present invention. A vehicle body 28 forming a frame of a bicycle is provided, and a saddle 22 coupled to the vehicle body is provided, and a front wheel 23 and a rear wheel 24 are provided to be supported by the vehicle body 28, The handle 21 is provided to adjust the direction of the bicycle. The vehicle body 28 may be provided by a hollow tubular member, or may be provided by a combination of a plurality of tubular members having a straight or curved shape. In addition, the crank shaft 30 is provided where the crank shaft 30 is provided, the crank shaft 30 is provided through the electric motor 25, the crank shaft disposed through the electric motor 25 ( The crank arm 26 is connected to both ends of 30, and both ends of the crank arm 26 are provided with pedals 27 so that the driver can move the bicycle by applying force with two feet.

The housing 45 is provided at the bicycle itself 28, and the crankshaft 30 which is rotatable is provided to be able to penetrate the housing 45. The housing 45 may be fixed by the vehicle body 28 of the bicycle, and may form a space therein to form a shape such that the electric motor 25 may be provided therein. In addition, the housing 45 may be briefly provided to allow the electric motor 25 to be fixed to the vehicle body 28 of the bicycle, and the housing 45 may be configured as necessary. The body 28 coupled to the housing 45 may support the handle 21 of the bicycle, support the saddle 22, and support the front and rear wheels 23 and 24. have. The vehicle body 28 of the bicycle may be composed of tubular members having a plurality of straight or curved shapes. In addition, the cover 46 may be provided to surround the electric motor 25 provided inside the housing 45 together with the housing 45. In addition, since the cover 28 may be omitted if necessary, and the electric motor 25 itself may be coupled to the vehicle body 28, the cover 28 is also preferably configured as necessary. The housing 45 and the cover 46 may be provided to surround the electric motor 25 so that the electric motor 25 is not visible from the outside.

The rotating crankshaft 30 may be disposed to penetrate the housing 45 and the cover 46, and may also be disposed to penetrate the electric motor 25 provided inside the housing 45. The crank arm 26 is connected to both ends of the crank shaft 30, respectively, and the crank arm 26 is coupled to the pedal 27 to rotate the crank shaft 30 by a force applied by a driver. Can be.

3 is a conceptual diagram illustrating an electric motor portion of a bicycle having an electric motor according to an embodiment of the present invention illustrated in FIG. 2, which is an embodiment of a permanent magnet rotating electric motor having a gear combination.

The electric motor 25 is provided with a fixing part, a rotating part rotating with respect to the fixing part, and a gear combination.

More specifically, the fixing portion is provided with a coil 37 through which current flows, and the crank shaft 30 is provided in the fixing portion or the housing 45 and the lid 46. And so on. The bearings 34-1 and 34-2 may be provided to support the crankshaft 30 so as to smoothly rotate. The coil 37 may be wound around the winding core 39, and the winding core 39 may be fixed to the support 32.

The rotating part is provided with a permanent magnet 38, a rotary case 31 is provided to rotate with the permanent magnet 38, the permanent magnet 38 is disposed to face the coil 37 is the permanent A gap is formed between the magnet 38 and the coil 37 and is disposed to generate a rotational force by generating a flow of magnetic flux. The rotating part is rotated by an electromagnetic force generated by the current flowing through the coil 37 and the action of the permanent magnet 38.

In addition, a first gear 36 coupled to the rotating part is provided to rotate together with the rotating part, and the first gear 36 is provided as an outer gear. The first gear 36 is preferably coupled to be concentric with the rotating part. The rotary case 31 may support the permanent magnet 38, and a bearing 34-3 may be provided at a central portion of the rotary case 31 to smoothly rotate the rotary unit. The permanent magnet 38, the rotation case 31, and the first gear 36 rotate together at the same speed. In addition, the first gear 36 is provided so that the crank shaft 30 penetrates through the hollow shape, that is, the hollow. A bearing 34-3 is provided between the crankshaft 30 disposed to penetrate the hollow portion of the first gear 36 so that rotation of the first gear 36 and the crankshaft 30 is separated. can do. That is, the first gear 36 and the crankshaft 30 may rotate at different speeds. The crankshaft 30 is disposed to pass through the central portion of the first gear 36 provided at one end of the rotating portion and to pass through the central portion of the rotating portion.

The first gear 36 may be provided in an extension of the rotary case 31, may be provided separately from the rotary case 31, it is preferable that the first case 36 is provided on the outer side of the rotary case 31 possible.

In addition, a bearing 34-3 may be provided between the rotating part and the crank shaft 30 disposed to penetrate the rotating part so that the rotation of the rotating part and the crank shaft 30 may be separated. That is, the rotating part and the crankshaft 30 may rotate at different rotation speeds, the rotating part is coupled to the outer ring of the bearing 34-3, and the crankshaft 30 is coupled to the inner ring. The rotation of the rotating part and the crankshaft 30 is separated by the bearing 34-3, and may rotate at different speeds.

In addition, the rotating case 31 provided in the rotating part is disposed to be separated from the direct coupling with the crank shaft 30 so that the rotating case 31 and the crank shaft 30 can rotate at different rotational speeds. The first gear 36 is not directly coupled to rotate at a different speed from the crankshaft 30, but is connected to the gear combination and is arranged to transmit the rotational force of the rotating unit. The first gear 36 may be provided at the extension of the rotary case 31 or may be provided integrally with the rotary case 31 or may be separately provided to be concentric.

The gear combination can be configured by including a plurality of gears such as the second gear 33, the third gear 35, and the fourth gear 40 so as to transmit rotational force. The gear combination is provided with all outer gears.

The outer gear can be manufactured easily and at low cost. In addition, the second gear 33 and the fourth gear 40 may be provided as a two-stage gear, thereby allowing a simple configuration and easily adjusting the gear ratio.

In addition, in the case of increasing the reduction ratio, it is possible to easily use a plurality of second gears. One end of the second gear 33 and the fourth gear 40 in the gear combination may be engaged with the first gear 36 provided in the rotating part to transmit the rotational speed and the rotational force of the rotating part, In addition, the second gear 33 and the fourth gear 40 may be provided with the same gear and may be provided with a second gear.

The second gear 33 and the fourth gear 40 are disposed to be engaged with the third gear 35 so that the rotational force of the first gear is increased by the second gear 33 and the fourth gear 40. It may be provided to be transmitted to the third gear 35 via the.

The crankshaft 30 may be disposed at the center of the third gear 35 provided as an outer gear so that the rotational force of the rotating part may be transmitted to the crankshaft 30 by the gear combination. And penetrating concentrically. The third gear 35 may be provided to be directly coupled to the crankshaft 30. In this case, the third gear 35 is rotated together with the crankshaft 30, so that the third gear 35 The clockwise or counterclockwise rotational force can be transmitted directly to the crankshaft 30, and the third gear 35 can rotate with the crankshaft 30 at the same rotational speed. .

In addition, the second gear 33 and the fourth gear 40 are provided as the second gear in order to reduce the rotational speed of the rotating part and transmit the deceleration speed to the crank shaft 30. The side of the crank shaft 30 which is engaged with the first gear and the number of teeth of the gear is arranged to be engaged with the third gear which is arranged to penetrate the crank shaft 30, and is arranged to penetrate the center of the third gear. The rotational speed of the rotating unit can be reduced and transmitted. Since the rotational speed of the rotating unit is reduced and transmitted by the gear ratio of the transmitted gears, the rotational speed of the crankshaft 30 is different from the rotational speed of the first gear and is also different from the rotational speed of the rotating unit. In addition, if there is no problem in terms of strength, one of the second gear 33 and the fourth gear 40 may be omitted.

In addition, a means 44 for rotating only in the one-way direction is provided between the third gear 35 and the crankshaft 30 so that the crankshaft 30 passes through the means 44 for rotating only in the one-way direction. Can be deployed. As the means 44 for rotating in the one-way direction only, for example, a one-way bearing or a one-way clutch, a freewheel, or the like may be used. In this case, only the one-way rotational force is transmitted from the clockwise or counter-clockwise rotational force of the third gear 35 by the means 44 rotating only in the one-way direction, and the rotational force in the other one-way direction is not transmitted. Only the rotational force in the one-way direction may be transmitted to the crankshaft 30. The means 44 for rotating only in the one-way direction may be coupled to be concentric in the center of the third gear 35. For miniaturization, a hole is formed in the center of the third gear 35 in the one-way direction. It is preferable to seat only means 44 to the hole of the third gear 35, the third gear 35 can rotate together at the same rotational speed in the one-way direction with the crankshaft 30 have.

In addition, the third gear 35 provided as an outer gear transmits a rotational force to the crankshaft 30, and the crankshaft 30 penetrates concentrically through the central portion of the third gear 35 as an outer gear. Since the rotational force is disposed to transmit the rotational force to the crankshaft 30, the rotational force transmission path may be simplified, and the transmission power loss may be minimized.

In addition, since the inner gear is not used in the gear combination, there is no need for the planetary gear, and the price competitiveness is excellent and the weight can be reduced.

In addition, the crankshaft rotation signal generator 41 for generating a rotational speed signal on the crankshaft 30 may be provided to sense the rotational speed of the crankshaft 30. The rotational force and the rotational speed generated in the rotating unit are transmitted to the gear combination through the first gear 36 and the gear combination is transmitted to the crankshaft 30, and the rotational speed and the crankshaft 30 of the rotating unit. ) May vary in speed. The crankshaft 30 appearing to the outside may be controlled by the speed of stepping on the pedal of the driver, the rotational speed of the crankshaft 30 may be necessary for smooth running. In this case, for example, a crankshaft rotation signal generator 41 such as a magnetic frequency generator or an optical frequency generator capable of generating a rotational speed on the crankshaft 30 is provided, and the rotational speed signal is provided to the fixed part. It is provided with a sensing element 42 can detect the rotational speed of the crankshaft (30).

The sensed rotational speed of the crankshaft can be used to control the electric motor 25. For example, when the rotational speed of the crankshaft 30 suddenly decreases in a short time, it may be determined that the driver stops the pedal rotation of the bicycle. When this situation occurs, the electric motor 25 may be controlled using electric motor control. You can stop the operation. In addition, since the rotation speed of the crankshaft 30 becomes zero and the rotation speed does not exist, the crankshaft 30 does not rotate, and thus it may be determined that the pedal is not stepped on. When the crank rotation speed starts to appear, the crankshaft is rotated. It can be determined that it starts to rotate. As such, the rotation information of the crankshaft may indicate the driving state of the driver, so it is very useful to detect the rotational speed of the crankshaft.

When the crankshaft 30 is provided with a magnetic speed signal generator, it can be detected by a device such as a Hall device or a Hall IC. When the optical speed signal generator is provided, a device such as a photo reflector can be used. Can be detected.

In addition, a circuit board 43 may be provided in the fixed part, and the circuit board 43 may include a rotor magnetic pole detection element 47, and a circuit device for appropriately supplying current to the coil 37. can do. The magnetic pole detecting element 47 may be used to detect a magnetic pole of the permanent magnet 38 to generate a signal to properly supply the current of the coil 37 so that the rotating unit can rotate smoothly. The stimulus detection element 47 may be provided in plural, and a rotor may be formed using a signal generated by the stimulus detection element 47 using a generation order of a plurality of stimulus detection signals or a method of distinguishing each signal. The direction of rotation of the can be detected. When the rotor rotates in a desired direction by sensing the rotational direction of the rotor, the rotation can be smoothly continued, and when the rotor rotates in an undesired direction, the electric current can be cut off to operate the motor. When operating the electric motor using this method, if the rotor rotates to match the direction in which the crankshaft rotates in the direction in which the bicycle is moving forward, the motor is operated, and the rotor rotates in accordance with the direction in which the crankshaft rotates in the direction in which the bicycle is reversed. When rotated, the motor can be configured not to operate.

In addition, the rotational force of the rotor is provided to be transmitted to the crankshaft 30 through the means 44 that rotates only in the first gear 36 and the one-way direction, the signal of the magnetic pole detection element 47 The crankshaft 30 and the gear combination may rotate when the electric motor operates, but the gears of the gear combination do not rotate even when the crankshaft 30 rotates when the motor does not operate. Can be configured.

In this way, when the crankshaft rotates in the reverse direction of the bicycle, the electric motor operates to prevent an accident from occurring in advance, and when the crankshaft 30 rotates when the electric motor is not operated, Since the gears and the rotating part of the gear combination do not rotate, the pedaling force of the bicycle driver can be reduced, so that the burden is not added even when the electric power is cut off and the motor is driven.

In this configuration, the gear combination is engaged with the first gear 36 provided at one end of the rotating part, and the rotating part is provided to rotate separately from the crank shaft 30. In addition, the third gear 35, which is one of the gear combinations, and the crankshaft 30 are coupled to transmit rotational force. The rotational force generated by the electric motor is transmitted to the gear combination through the first gear 36 provided in the rotating part, and the rotational force is transmitted to the crankshaft 30 through the gear combination. Accordingly, the rotational speed of the rotating part of the motor and the rotational speed of the crankshaft 30 of the electric motor rotate at different speeds by the gear ratio of the gear combination, and the rotational force of the rotor of the motor is set by the gear ratio of the gear combination. The rotational force of the shaft 30 is different.

As described above, in the electric motor having the gear combination according to the present invention, the structure is simplified by transmitting the rotational force generated from the rotating part to the crankshaft 30 through the combination of the outer gears, and the rotating shaft of the motor and the shaft of the gear combination are simplified. The same effect as that of the crankshaft 30 is integrated, and since the motor and gear combination are integrated, it is advantageous for miniaturization. In addition, the crankshaft 30 is provided to be completely concentric because it is integrated with the output shaft of the gear combination.

In addition, the crank shaft 30 is disposed through the electric motor 25 so that both ends of the crank arm 26 is connected, both ends of the crank arm 26 is provided with a pedal 27, In addition, a gear set may be further provided and coupled to one side of the crank shaft 30. The gear set may also be referred to as a sprocket as a gear set provided in the crank part.

As described above, the bicycle having the electric motor according to the present invention transmits the rotational force of the rotating part to the crankshaft through the gear combination and can be provided so that only the crankshaft is visible to the outside. It also has the advantage of replacing the crank arm, mounting or replacing the sprocket.

In addition, the cover 46 through which the crankshaft 30 penetrates is provided. The cover 46 may surround the electric motor 25 together with the housing 45, and the cover 46 may be opened and closed to open the cover 46 as necessary to open the electric motor ( 25) You can check the condition. In addition, the cover 46 may be provided integrally with the electric motor. This configuration is easy to check the state of the electric motor 25 by opening the cover 46 when the motor 25 is broken or abnormal or need to be checked.

Figure 4 is a schematic cross-sectional view showing an embodiment of a coil rotary electric motor having a gear combination in a bicycle provided with an electric motor according to an embodiment of the present invention. Since the basic configuration and operation principle are the same as those described in FIG. 3, only the differences from FIG. 3 will be described.

A fixed part having a permanent magnet 58 and a fixed case 52 and a crankshaft 50 are provided, and a bearing 57 is provided.

The rotating part is provided with a winding coil 54 and a holder 60, and a fifth gear 56 is provided at one end of the rotating part extending in the longitudinal direction of the crankshaft 50 so that the holder 60 of the rotating part is provided. ) And rotates together with the coil 54. The fifth gear 56 is preferably provided at one end of the holder 60 extending in the longitudinal direction of the crankshaft 50 or is integrally provided.

The coil 54 may be wound around the winding core 59, and the winding core 59 may be supported by the holder 60. In addition, a commutator 51 capable of supplying a current to the coil 54 may be provided to rotate together with the holder 60 to be disposed concentrically with the crankshaft 50.

The permanent magnet 58 is disposed to face the coil 54 in the fixed part, and is disposed to generate a rotational force by the action of the current flowing through the coil 54 and the magnetic flux of the permanent magnet 58. do. In addition, the brush 53 may be provided with a sliding contact with the commutator 51 to supply a current to the coil 54 to supply the current to the commutator 51. The permanent magnet may be disposed to surround the coil, and the fixing case 52 may form a space therein to place the rotary part and the gear combination 55 therein.

In addition, the gear combination 55 is provided so that at least one gear of the gear combination meshes with the fifth gear 56 of the rotating part, and another gear of the gear combination is connected to the crankshaft 50. Are placed concentrically. The rotational force of the rotating part is transmitted to the gear combination 55 through the fifth gear 56 of the rotating part provided at one end of the rotating part, and the gear combination 55 transmits the rotating force to the crankshaft 50. This is as described in FIG.

In addition, when the crankshaft 50 and one gear of the gear combination are coupled concentrically, it may be coupled via a means 61 for rotating in the one-way direction, and may further include a circuit board. As described above.

In addition, although not shown in the embodiment of Figure 4 may be provided with a means for generating a rotational speed signal on the crankshaft 50 to detect the rotational speed of the crankshaft (50). The crankshaft includes a speed signal generating means such as a magnetic frequency generator or an optical frequency generator capable of generating a rotational speed on the crankshaft 50 and an element capable of sensing a rotational speed signal in the fixed part. The rotation speed of 50 can be detected. When the crankshaft 50 is provided with a magnetic speed signal generator, it can be detected by a device such as a Hall element or a Hall IC, and when the optical speed signal generator is provided, it is sensed by using a device such as a photo reflector. can do.

As described with reference to the embodiments of Figs. 3 and 4, the motor including the gear combination of the present invention is provided by integrating the crank shaft 50 of the electric motor and the crank shaft 50 of the gear combination, and the rotation of the rotating part of the motor. By transmitting the power to the crankshaft 50 through the gear combination it can be different from the rotational speed or rotational force and the rotational speed and rotational force of the crankshaft 30 of the motor rotation.

In addition, a bicycle having an electric motor according to the present invention can directly combine or detach a gear set provided on the crank side, generally referred to as a sprocket, on the crankshaft as a bicycle without an electric motor, and can also be replaced. It can be used in the same way as a bicycle without an electric motor.

In addition, the motor having a gear combination of the present invention has the advantage that the gear combination is easy to configure integrally with the motor, the structure is simple. In addition, since the output shaft of the motor is the same as the crank shaft 50, which is the output shaft of the gear combination, it is very advantageous in the application field for transmitting power concentrically to the outside.

As described above, the electric motor including the gear combination of the present invention includes all the gear combinations as the outer gear, and the crankshaft is arranged to penetrate the center of the outer gear so that the power of the motor can be transmitted to the crankshaft. can do. The advantages of the present invention can minimize power loss, reduce weight and improve price competitiveness as described above.

The motor with a gear combination according to the embodiment of the present invention described above

Exemplary embodiments have been described by way of example only, and this is merely exemplary, and one of ordinary skill in the art may have various substitutions, modifications, changes, and equivalent embodiments without departing from the technical spirit of the present invention. I understand that it is possible. The true technical protection of the invention should be defined by the following claims.

1: Sprocket
2: First LaChat
3: toothed gear
5: crankshaft
6: rotor
13: inner gear
14: center outer gear
15: planetary gear
17: hollow shaft
21: handle
22: saddle
23: front wheel
24: rear wheel
25: electric motor
26: crank arm
27: Pedal
28 body
30, 50: crankshaft
31: rotating case
32: Holder
36, 33, 35, 40, 56: 1st gear, 2nd gear, 3rd gear, 4th gear, 5th gear
34-1, 34-2, 34-3: Bearing
37, 54: coil
38, 58: magnet
39, 59: winding core
41: rotation signal generator
42: rotation signal detection means
43: circuit board
44: means for rotating only in the one-way direction (44)
45, 52: housing
46: cover
51: commutator
53: brush
55: gear combination

Claims (5)

In a bicycle with an electric motor

The motor is provided with a fixed portion,
Rotating portion is provided that rotates with respect to the fixed portion,
It is provided with a magnet or a coil rotating in the rotating portion,
The fixed part is provided with a magnet or a coil not provided in the rotating part,
The magnet acts with the coil to generate a rotational force,

A first gear is provided and coupled to be concentric with the rotating part,
The first gear is provided with an outer gear to rotate together with the rotating unit,

Is equipped with a rotating crankshaft,
The crankshaft is disposed to penetrate the central portion of the first gear and the central portion of the rotating part,
The crankshaft is also arranged to penetrate the central portion of the fixing part,
Both ends of the crankshaft are coupled to the pedal through the crank arm,

Gear combination that can transmit the rotational force is provided with a plurality of gears,
The gear combination is all provided with outer gears,
Means for rotating in only one-way direction is provided concentrically coupled to at least one outer gear of the gear combination,
The first gear is engaged with at least one gear of the gear combination to transmit the rotational force of the rotating unit,
The crankshaft is outside of at least one of the gear combinations It is arranged to penetrate through the gear center, and the crankshaft is arranged to penetrate through the center of the means for rotating only in the one-way direction,
The rotational force of the rotating unit is transmitted to the crankshaft through means for rotating only in the first gear, the gear combination and the one-way direction,

And the crankshaft and the gear combination may rotate when the electric motor operates, but the gears of the gear combination do not rotate even when the crankshaft rotates when the motor does not operate.
In a bicycle with an electric motor

The electric motor
The fixing part is provided,
Rotating portion is provided that rotates with respect to the fixed portion,
It is provided with a magnet or a coil rotating in the rotating portion,
The fixed part is provided with a magnet or a coil not provided in the rotating part,
It is arranged to generate a rotational force by the action of the magnet and the coil,

The first gear is provided as an outer gear is coupled to be concentric with the rotating part
Rotate with the rotating part,

The fixed portion is provided with a magnetic pole detection element for detecting the magnetic pole of the magnet,

Is provided to rotate the crankshaft through the electric motor,
The crankshaft is disposed to penetrate the central portion of the first gear and the central portion of the rotating part,
The crankshaft is also arranged to penetrate the fixing part,
Both ends of the crankshaft are coupled to the crank arm,
A pedal is provided at the end of the crank arm,

Gear combinations that can transmit torque are provided with a plurality of gears,
The gear combinations are all provided as outer gears,

The first gear is engaged with at least one gear of the gear combination to transmit the rotational force of the rotating unit,
The crankshaft is also arranged to penetrate the central portion of at least one outer gear of the gear combination,

Rotation force of the rotating unit is provided to be transmitted to the crankshaft through the first gear and the gear combination,

And the electric motor is operated when the crankshaft rotates in the direction in which the bicycle moves forward by the signal of the magnetic pole detection element, and does not operate when the motor rotates in the reverse direction. The method according to claim 1 or 2
At least one gear of the gear combination is provided as a second gear,
Wherein the gear side with the higher number of teeth of the second gear meshes with the first gear and the gear side with the lower number of teeth of the gear meshes with the outer gear through which the crankshaft passes.
The motor of claim 1 or 2, further comprising a speed signal generator indicating a rotational speed of the crankshaft inside the motor.
The bicycle characterized in that the device for sensing the rotational speed of the crankshaft in the fixed portion
The method of claim 2
Means for rotating only in the one-way direction is included in the gear combination,
A hole is formed in the center of one outer gear of the gear combination and in the one-way direction
The means for rotating only is seated in a hole in the center of the outer gear, and the crankshaft is arranged to pass through the means for rotating only in the one-way direction.
bicycle

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