JP4382944B2 - Electric assist bicycle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a battery-assisted bicycle, and more particularly, to a battery-assisted bicycle capable of supplying a regenerative current to a power source battery for applying a power assist force to a pedaling force.
[0002]
[Prior art]
There is known an electrically assisted bicycle including a human power drive system for transmitting a pedal force applied to a pedal to a rear wheel and a motor drive system capable of adding auxiliary power to the human power drive system according to the pedal force. Yes. For example, Japanese Patent Application Laid-Open No. 10-250673 has a drive device in which a manpower drive system including a crankshaft and its bearings, and a drive system for combining auxiliary power from the motor with the crankshaft are housed in a single housing. A bicycle is disclosed.
[0003]
[Problems to be solved by the invention]
A battery is mounted on the battery-assisted bicycle as a power source for the motor for applying the battery-assisted power, but it is desirable that the battery can run for a long time with one battery charge. Therefore, it is conceivable to charge the battery by regenerative power generation in order to effectively use the energy during the self-running period of the bicycle. For example, a regenerative control device for a battery-assisted bicycle that detects operation of a brake lever and commands a regenerative operation to the regenerative device has been proposed (see JP-A-8-140212).
[0004]
However, since the drive system of the battery-assisted bicycle is usually provided with a one-way clutch that transmits the rotation only in one direction, the regenerative current cannot be obtained by the rotation of the wheel during the braking operation. A specific structure for generating a regenerative current during a braking operation by rotation of a wheel has not been proposed in the above publication. Therefore, a proposal of a battery-assisted bicycle having a practical regenerative device has been desired.
[0005]
An object of the present invention is to provide a battery-assisted bicycle that can charge a battery with a regenerative current generated by rotation of a wheel during a braking operation.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a battery-assisted bicycle having a human power drive unit including a pedal crankshaft for transmitting a pedaling force and a motor drive unit including a motor for generating auxiliary power combined with the human power drive unit. The first one-way clutch for transmitting the rotation of the motor drive unit to the rear wheels, the brake means for braking the rear wheels, and the direct connection for directly connecting the first one-way clutch in response to the bias of the brake means The first feature is that it comprises means. According to the first feature, when the first one-way clutch is directly connected, the rotation of the rear wheels is transmitted to the motor drive unit during a braking operation during traveling, and a regenerative current is generated.
[0007]
Further, the present invention includes a drive sprocket directly connected to the rear wheel via a chain, and a second one-way clutch that transmits the rotation of the pedal crankshaft to the drive sprocket, and the motor drive unit includes the first drive sprocket. A second feature is that the one-way clutch is coupled to the drive sprocket. According to the second feature, since the pedal crankshaft is coupled to the drive sprocket via the second one-way clutch, it does not follow the drive sprocket. Therefore, the rotation of the rear wheel is not transmitted to the pedal crankshaft during braking, and the pedal is not rotated.
[0008]
Further, the present invention includes a cylindrical rear wheel hub, the motor drive unit is accommodated in the rear wheel hub, and the first one-way clutch includes the output shaft of the motor drive unit and the rear shaft. A third feature is that it is provided between the wheel hubs. According to the third feature, since the motor drive unit is not installed near the pedal crankshaft, the degree of freedom increases in the layout of the components around the pedal crankshaft.
[0009]
Further, in the present invention, the first one-way clutch is configured to couple members coaxially arranged on the inner circumference and the outer circumference thereof, and the direct coupling means presses the members from the side. The fourth feature is that the two-way clutch is directly connected to each other, and the structure for directly connecting the one-way clutch is simplified.
[0010]
Further, the present invention has a fifth feature in that the direct connection means is biased by the operating force of the brake means, and the direct connection means can be driven without using an electric drive means.
[0011]
Further, the present invention has a sixth feature in that it comprises a detecting means for detecting an operation of the brake means, and an electromagnetic means for energizing the direct connection means in response to an operation detected by the detecting means. A mechanism for transmitting the mechanical driving force to the direct connection means can be simplified.
[0012]
The present invention is also provided with a drive sprocket coupled to the motor drive unit via the first one-way clutch, and coaxially with a rear wheel. Rear sprocket And the drive sprocket and the Rear sprocket A chain directly connecting the Rear sprocket A third one-way clutch for transmitting the rotation of the rear wheel to the rear wheel, and a second direct coupling means for directly coupling the third one-way clutch in response to the urging of the brake means. There are features. According to the seventh feature, since the third one-way clutch is not directly coupled during coasting without brake operation, the rotation of the rear wheel is not transmitted to the chain. Therefore, regenerative power generation is performed by the brake operation, and an extra load is not added to the rear wheels when coasting without the brake operation, so that it can be coasted lightly.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a battery-assisted bicycle having the drive device of the present invention, and FIG. 2 is an enlarged view of a main part of FIG. The body frame 2 of the battery-assisted bicycle includes a head pipe 21 located at the front of the vehicle body, a down pipe 22 extending downward and rearward from the head pipe 21, and a seat post 23 rising upward from the vicinity of the end portion of the down pipe 22. Prepare. The connecting portion between the down pipe 22 and the seat post 23 and the peripheral portion thereof are covered with a resin cover 33 that is divided into two parts in the vertical direction and is attached and detached. A steering handle 27 is rotatably inserted into the upper portion of the head pipe 21 via a handle post 27A, and a front fork 26 connected to the handle post 27A is supported at the lower portion of the head pipe 21. A front wheel WF is rotatably supported at the lower end of the front fork 26.
[0014]
Below the vehicle body frame 2, the electric auxiliary unit 1 as a driving device including an electric motor M for assisting the treading force is connected to the connecting portion 92 at the lower end of the down pipe 22 and the front portion of the battery bracket 49 welded to the seat post 23. The connection portion 91 provided on the bracket 49 and the connection portion 90 at the rear of the bracket 49 are bolted and suspended. In the connecting portion 90, the chain stay 25 is fastened together with the electric auxiliary unit 1.
[0015]
A power switch 29 of the electric auxiliary unit 1 that is turned on / off by a power key is provided in the vicinity of the head pipe 21 on the down pipe 22. The mounting position of the power switch 29 is not limited to the illustrated position, and may be provided on the handle 27 in front of the handle post 27A, for example. The power auxiliary unit 1 can be turned on by a remote control switch (described later) using an infrared signal, for example. In this case, the power switch unit 29 is provided with a receiver that receives an infrared signal transmitted from the remote control switch.
[0016]
The electric auxiliary unit 1 is provided with a drive sprocket 13, and the rotation of a pedal crankshaft (hereinafter simply referred to as “crankshaft”) 101 is transmitted from the drive sprocket 13 to the rear sprocket 14 through the chain 6. Note that the drive sprocket 13 and the rear sprocket 14 are rigidly attached to enable regenerative power generation, that is, such that one of both sprockets rotates in either direction and the other follows and rotates. It has become.
[0017]
The handle 27 is provided with a brake lever 27B, and the operation of the brake lever 27B is transmitted to a brake device (not shown) of the rear wheel WR through the brake wire 39. Further, the brake wire 39 branches to the electric auxiliary unit 1, and the operation of the brake lever 27 </ b> B is transmitted as a displacement of the brake wire 39 to a cam for operation of a regenerative power generator described later.
[0018]
In this bicycle, since the coupling portion between the down pipe 22 and the seat post 23 is laid out at the front portion of the electric auxiliary unit 1, the electric auxiliary unit 1 can be disposed at a low position, and a low center of gravity is achieved. Further, since the height of the vehicle body frame 2 can be kept low, “easiness to straddle” is also good.
[0019]
A crankshaft 101 is rotatably supported on the electric auxiliary unit 1, and pedals 12 are pivotally supported on both left and right ends of the crankshaft 101 via cranks 11. A rear wheel WR as a drive wheel is pivotally supported between the terminal ends of a pair of left and right chain stays 25 extending rearward from the electric auxiliary unit 1. A pair of left and right seat stays 24 are provided between the upper portion of the seat post 23 and the terminal ends of both chain stays 25. A seat 30 is provided at the upper end of the seat post 23, and a seat pipe 31 is mounted so as to be slidable within the seat post 23 in order to adjust the height of the seat 30.
[0020]
A battery 4 accommodated in a storage case is attached to the rear of the seat post 23 below the seat 30. The battery 4 is composed of a plurality of battery cells, and is installed along the seat post 23 so that the longitudinal direction is substantially vertical.
[0021]
2 is a cross-sectional view of the electric auxiliary unit 1, and FIG. 3 is a view taken along the line AA of FIG. The case of the electric auxiliary unit 1 includes a main body 70, and a left cover 70L and a right cover 70R attached to both side surfaces thereof. The case 70, the left cover 70L, and the right cover 70R are manufactured by a resin molded product for weight reduction. On the periphery of the case body 70, hangers 90a, 91a, and 92a are formed, which are adapted to the connecting portions 90, 91, and 92 of the down pipe 22 and the battery bracket 49, respectively. The main body 70 is provided with a bearing 71, and the right cover 70R is provided with a bearing 72. A crankshaft 101 is inscribed in the inner ring of the bearing 71, and a sleeve 73 is provided in the inner ring of the bearing 72 so as to be coaxial with the crankshaft 101 and slidable in the outer circumferential direction with respect to the crankshaft 101. That is, the crankshaft 101 is supported by the bearing 71 and the bearing 72.
[0022]
A boss 74 is fixed to the sleeve 73, and an assist gear 76 is provided on the outer periphery of the boss 74 via a one-way clutch (first one-way clutch) 75 made of, for example, a ratchet mechanism. The assist gear 76 is preferably made of resin from the viewpoint of weight reduction, and is preferably a helical gear from the viewpoint of quietness.
[0023]
A gear 73a is formed at one end of the sleeve 73, and three planetary gears 77 are arranged on the outer periphery of the gear 73a as a sun gear. The planetary gear 77 is supported by a shaft 77 a standing on the support plate 102, and the support plate 102 is supported by the crankshaft 101 via a one-way clutch (second one-way clutch) 78. The planetary gear 77 meshes with an inner gear formed on the inner periphery of the pedaling force detection ring 79. A driving sprocket 13 coupled to the rear sprocket 14 by a chain 6 is fixed to an end portion (side where no gear is formed) of the sleeve 73.
[0024]
The pedaling force detection ring 79 has arms 79a and 79b projecting from the outer periphery thereof. The arms 79a and 79b are tension springs 80 provided between the arm 79a and the main body 70, and the arm 79b and the main body 70. The crankshaft 101 is urged in a direction opposite to the rotation direction during traveling (clockwise in the figure) by a compression spring 81 provided between the two. The compression spring 81 is provided to prevent the ring 79 from rattling. The arm 79b is provided with a potentiometer 82 for detecting the displacement of the ring 79 in the rotational direction.
[0025]
A disc-shaped clutch plate 86 for regenerative power generation is disposed adjacent to the assist gear 76 via a spring washer 85. Further, the plate 86 is placed on the assist gear 76 side against the spring washer 85. A pressure plate 87 for pressing is disposed adjacent to the pressure plate 87. Both the clutch plate 86 and the pressure plate 87 are slidable in the axial direction with respect to the sleeve 73.
[0026]
The pressure plate 87 is biased toward the clutch plate 86 by a cam 88 brought into contact with an inclined surface formed in the hub portion. The cam 88 is rotatably supported on the right cover 70R by a shaft 89, and the lever 7 is fixed to an end portion of the shaft 89, that is, a portion protruding to the outside from the right cover 70R. The lever 7 is coupled to the brake wire 39. When the brake is applied, the lever 7 is rotated by the brake wire 39, and the cam 88 rotates about the shaft 89 as the lever 7 rotates. .
[0027]
A pinion 83 fixed to the shaft of the motor M is engaged with the assist gear 76. The motor M is a three-phase brushless motor, and includes a rotor 111 having a magnetic pole 110 of a neodymium (Nd—Fe—B system) magnet, a stator coil 112 provided on the outer periphery thereof, and a magnetic pole provided on a side surface of the rotor 111. Rubber magnet ring for sensor (N-pole and S-pole are alternately arranged to form a ring) 113, Hall IC 115 arranged opposite to rubber magnet ring 113 and attached to substrate 114, rotor 111 shafts 116. The shaft 116 is supported by a bearing 98 provided on the left cover 70L and a bearing 99 provided on the case body 70.
[0028]
A controller 100 including a driver FET and a capacitor for controlling the motor M is provided near the front of the vehicle body of the case body 70, and power is supplied to the stator coil 112 through the FET. The controller 100 operates the motor M in accordance with the pedaling force detected by the potentiometer 82 as a pedaling force detector, and generates auxiliary power.
[0029]
The case main body 70 and the covers 70L and 70R are preferably made of a resin molded product from the viewpoint of weight reduction, but on the other hand, it is necessary to increase the strength around the bearing. Therefore, in the present embodiment, metal reinforcing members 105, 106, and 107 such as iron, aluminum, aluminum alloy, and copper alloy are arranged around the bearing. In particular, the reinforcing members arranged in the case main body 70 are portions where a large load is expected, such as the bearing 71 of the crankshaft 101, the bearing 99 of the motor shaft 116, and the hangers 90a, 91a, and 92a that are attachment members to the vehicle body. Therefore, the reinforcing members of the respective parts are connected to each other to form an integral reinforcing plate 105. According to the reinforcing plate 105, the reinforcing members arranged around the bearings and the hangers communicate with each other to further enhance the reinforcing effect.
[0030]
The reinforcing plate 105 is not limited to connecting all of the reinforcing members around the bearing 71 and the bearing 99 and the hangers 90a, 91a, and 92a. Among these reinforcing members, those close to each other, for example, around the hanger 90a. The reinforcing member and the reinforcing member around the bearing 99 may be connected, or the reinforcing member around the bearing 71 and one of the reinforcing members around the bearing 99 or the hangers 90a, 91a, and 92a may be connected. The reinforcing members 105, 106, and 107 are preferably formed integrally with the case 70 and the covers 70L and 70R during resin molding.
[0031]
In the electric auxiliary unit 1 configured as described above, when a pedaling force is applied to the crankshaft 101 via the crank 11, the crankshaft 101 rotates. The rotation of the crankshaft 101 is transmitted to the support plate 102 via the one-way clutch 78, the shaft 77a of the planetary gear 77 is rotated around the sun gear 73a, and the sun gear 73a is rotated via the planetary gear 77. As the sun gear 73a rotates, the drive sprocket 13 fixed to the sleeve 73 rotates.
[0032]
When a load is applied to the rear wheel WR, the pedaling force detection ring 79 rotates according to the magnitude of the load, and the amount of rotation is detected by the potentiometer 82. When the output of the potentiometer 82, that is, the output corresponding to the load is larger than the predetermined value, the motor M is energized according to the magnitude of the load and auxiliary power is generated. The auxiliary power is combined with the driving torque generated by the human power generated by the crankshaft 101 and transmitted to the driving sprocket 13.
[0033]
When a brake is applied to decelerate the vehicle during traveling, the cam 88 is rotated about the shaft 89 by the brake wire 39, and the pressure plate 87 presses the clutch plate 86. Then, the clutch plate 86 is biased toward the assist gear 76, the boss 74 and the assist gear 76 are coupled via the clutch plate 86, and the rotation of the boss 74 is transmitted to the assist gear 76. Accordingly, the rotation of the driving sprocket 13 during braking is transmitted to the pinion 83 through the sleeve 73, the boss 74 and the assist gear 76. The rotation of the pinion 83 is transmitted to the inner rotor 111. As a result, an electromotive force is generated in the stator coil 112, and regenerative power generation is performed. The current generated by the power generation is supplied to the battery 4 through the controller 100, and the battery 4 is charged. The planetary gear 77 is rotated by the rotation of the sleeve 73 during the brake operation, and the support plate 102 is rotated. However, the rotation of the support plate 102 is not transmitted to the crankshaft 101 by the action of the one-way clutch 78.
[0034]
The pressure plate 87 may be electromagnetic as follows instead of being biased by the cam 88. FIG. 4 is a cross-sectional view according to a modification of the urging means of the pressure plate 87, and the same reference numerals as those in FIG. 2 denote the same or equivalent parts. In the figure, a linear solenoid 89a is attached to the right cover 70R at a position close to the bearing 72. The plunger 88 a of the solenoid 89 a is provided so as to be displaceable parallel to the crankshaft 101. The solenoid 89a is supplied with an operating current from the battery 4 via a switch means (not shown) (for example, interlocked with the movement of the brake wire 39) for detecting a brake operation. The solenoid 89a is set so that the plunger 88a protrudes toward the pressure plate 87 when a current is supplied.
[0035]
Therefore, when the brake is operated and current is supplied from the battery 4, the plunger 88 a protrudes and the pressure plate 87 is pressed toward the clutch plate 86. As a result, the clutch plate 86 overcomes the spring 85 and is displaced toward the boss 74, locks the one-way clutch 75, and connects the boss 74 and the assist gear 76.
[0036]
Next, a second embodiment will be described. FIG. 5 is a cross-sectional view of the battery-assisted rear unit according to the second embodiment. The rear wheel shaft 34 is supported by a chain stay 25 fixed by screw portions formed at both ends thereof and nuts 35 and 35 screwed to the screw portions. Note that both ends of the rear wheel shaft 34 are connected not only to the chain stay 25 but also to the seat stay 24, and a stay that supports a load carrier, a cover of the rear wheel, and the like. Yes. The motor M provided coaxially with the rear wheel shaft 34 is a three-phase brushless motor, and includes a rotor 111 having a magnetic pole 110 of a neodymium (Nd-Fe-B system) magnet and a stator coil 112 provided on the outer periphery thereof. Become. A rubber magnet ring 113 for a magnetic pole sensor and a Hall IC 115 attached to the substrate 114 are provided on the side surface of the inner rotor 111 so as to face the rubber magnet ring 113.
[0037]
The motor housing 36 that houses the inner rotor 111 includes a housing body 36a and a cap 36b. The housing main body 36 a is fixed to the rear wheel shaft 34 via a cap 36 b, and the housing main body 36 a is engaged with the outer periphery of the small diameter portion of the inner rotor 111 via a bearing 37. The substrate 114 is sandwiched between the cap 36b and the housing body 36a, and the controller 100 is accommodated in the space between the cap 36b and the substrate 114.
[0038]
A rear wheel hub 38 is provided so as to cover the motor housing 36, and a cover 41 is fixed to a side surface of the rear wheel hub 38 by a set screw 40, and the rear wheel hub 38 is fitted in the center of the cover 41. The rear wheel shaft 34 is rotatably supported via a combined bearing 42 and a bearing 43 fitted to the outer periphery of the housing body 36a. Further, a one-way clutch 44 is interposed between the rear wheel hub 38 and the outer periphery of the narrow diameter portion of the inner rotor 111. The one-way clutch 44 is set in an engagement direction so that the rear wheel hub 38 rotates as the inner rotor 111 rotates when the coil 112 is energized and the inner rotor 111 is energized.
[0039]
The cover 41 is provided with a rear sprocket 46 coaxially with the shaft 34 via a one-way clutch 45. The rear sprocket 46 is connected to a drive sprocket (not shown) via the chain 6. In the second embodiment, since the motor for electric assistance is provided in the rear wheel hub 38, the electric auxiliary unit 1 according to the first embodiment for combining the electric assistance force with the pedaling force by human power is not provided. In the second embodiment, the crankshaft for transmitting the pedaling force may be supported by a bearing fixed to the vehicle body frame 2 and a drive sprocket may be directly connected to the crankshaft. However, the pedaling force detection ring 79 is installed with respect to the crankshaft, and the urging spring, the potentiometer for detecting the rotation amount, etc. are modified as appropriate from the first embodiment.
[0040]
The one-way clutch 45 is set to engage with the cover 41 when a pedaling force is applied to the crankshaft and the rear sprocket 46 rotates, and when the pedaling force is released, the engagement between the cover 41 and the rear sprocket 46 is released. Is done.
[0041]
A disc-shaped clutch plate 86 for regenerative power generation is disposed adjacent to the side surface of the inner rotor 111 opposite to the side where the rubber magnet ring 113 is provided via a spring washer 85. A pressure plate 87 for pressing the plate 86 toward the assist gear 76 against the spring washer 85 is disposed adjacently. Both the clutch plate 86 and the pressure plate 87 are slidable in the axial direction with respect to the rear wheel shaft 34.
[0042]
A cam 88 for biasing the pressure plate 87 toward the clutch plate 86 is provided in the same manner as in the first embodiment. A shaft 89 that supports the cam 88 is rotatably supported by the second cover 47 of the rear wheel hub 38, and a lever 7 is provided at an end portion of the shaft 89, that is, a portion protruding outward from the second cover 47. Is fixed. The lever 7 is coupled to the brake wire 39. When the brake is applied, the lever 7 is rotated by the brake wire 39, and the cam 88 rotates about the shaft 89 as the lever 7 rotates. .
[0043]
A brake shoe 48 is fixed to the shaft 89 and rotates in the same manner as the cam 88 as the lever 7 rotates. The brake shoe 48 is configured to be pressed against the inner peripheral surface of the rear wheel hub 38 to brake the rotation of the rear wheel hub 38. A seal member 49 is provided around the second cover 47 to seal the space between the rear wheel hub 38 and the second cover 47.
[0044]
In the second embodiment configured as described above, the pedaling force applied to the crankshaft is transmitted to the rear sprocket 46 via the chain 6, and the rear wheel hub 38 is rotated via the one-way clutch 45 as the rear sprocket 46 rotates. . A current is supplied to the stator coil 112 when the pedaling force exceeds a predetermined reference value. The magnitude of this current is changed according to the pedal effort. When current is supplied to the stator coil 112, the inner rotor 111 is rotated, and the rotation of the inner rotor 111 is transmitted to the rear wheel hub 38 via the one-way clutch 44. That is, the auxiliary force by the motor M is combined with the pedaling force by human power.
[0045]
When a brake is applied during traveling, the shaft 89 is rotated through the brake wire 39, the clutch plate 86 is displaced by the pressure plate 87, and the rear wheel hub 38 and the inner rotor 111 are directly connected. As a result, the rotation of the rear wheel hub 38 is transmitted to the inner rotor 111, and a regenerative current is generated in the stator coil 112. The regenerative current is supplied to the battery 4 through the controller 100 as in the first embodiment.
[0046]
Furthermore, the second embodiment can be modified as follows. First, instead of transmitting the rotation of the rear sprocket 46 to the rear wheel hub 38 via the one-way clutch 45, a one-way clutch may be interposed between the drive sprocket and the crankshaft. In short, what is necessary is just to comprise so that rotation of a crankshaft may be transmitted to the rear-wheel hub 38 via a one-way clutch. Further, as in the first embodiment, a solenoid as shown in FIG. 4 may be provided in place of the cam 88 for biasing the pressure plate 87.
[0047]
In addition, the following configuration can be added to the first embodiment. FIG. 6 is a cross-sectional view around the rear wheel hub according to a modification of the first embodiment. In the figure, a rear wheel shaft 34 is fixed to a chain stay 25 by nuts 35 and 35 screwed to threaded portions formed at both ends thereof. The rear wheel hub 50 is rotatably supported on the rear wheel shaft 34 by bearings 51, 51, and a rear sprocket 46 is supported at one end thereof via a one-way clutch (third one-way clutch) 54. A clutch plate 52 is provided on an extension of the rear wheel shaft 34 on the side to which the sprocket 46 is fixed, and is slidable in the axial direction. A spring washer 53 is provided between the clutch plate 52 and the rear sprocket 46. It is sandwiched. A linear solenoid 56 is provided on the back surface side of the clutch plate 52, that is, on the shaft end side of the rear wheel shaft 34, and the tip of the plunger 55 is in contact with the back surface of the clutch plate 52. The coil of the solenoid 56 is supplied with current from the battery 4 in response to the brake operation, like the solenoid 89a.
[0048]
In FIG. 6, the pedaling force and the electric auxiliary force are transmitted through the chain 6 by the electric auxiliary unit 1. Rear sprocket When transmitted to 46, the rear wheel hub 50 rotates and the rear wheel WR is rotated. When the solenoid 56 is energized in response to a braking operation during traveling, the plunger 55 is displaced toward the clutch plate 52, and the clutch plate 52 is biased toward the one-way clutch 54 against the spring washer 53 to disengage the one-way clutch 54. Lock it.
[0049]
Thus, only when the driving force by the electric auxiliary unit 1 is given and during the brake operation Rear sprocket Since 46 is directly connected to the rear wheel hub 50, the chain 6 does not circulate during coasting without brake operation. Therefore, the load during coasting is reduced, and a light running feeling can be obtained.
[0050]
【The invention's effect】
As is clear from the above description, according to the inventions of claims 1 to 7, the first one-way clutch can be directly connected and the regenerative power generation by the motor drive unit can be performed during the brake operation. It can be used for charging the power source of the motor drive unit. In particular, according to the second aspect of the invention, the pedal crankshaft does not rotate during regenerative power generation by the second one-way clutch, and according to the seventh feature, a light coasting performance can be obtained during coasting without brake operation.
[0051]
According to the invention of claim 3, the degree of freedom of the layout around the pedal crankshaft can be increased. According to the invention of claim 4, the structure for directly connecting the first one-way clutch for regeneration is simple. It becomes.
[0052]
Further, according to the invention of claim 5, the one-way clutch can be directly connected without using the electric drive means, and according to the sixth feature, the one-way clutch can be directly connected without using the mechanical drive means. it can.
[Brief description of the drawings]
FIG. 1 is a side view of a battery-assisted bicycle according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a main part of an electric auxiliary unit.
FIG. 3 is a cross-sectional view taken along the line AA in FIG.
FIG. 4 is a cross-sectional view showing a direct coupling means of a one-way clutch.
FIG. 5 is a cross-sectional view of a motor drive unit built in a rear wheel hub.
FIG. 6 is a sectional view of a rear wheel hub including a third one-way clutch.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Electric auxiliary unit, 2 ... Body frame, 4 ... Battery, 13 ... Drive sprocket, 29 ... Power switch part, 38, 50 ... Rear wheel hub, 39 ... Brake wire, 46 ... Rear sprocket, 54 ... 3rd one way Clutch, 70 ... case body, 75 ... first one-way clutch, 78 ... second one-way clutch, 86 ... clutch plate, 100 ... controller, 101 ... pedal crankshaft, 102 ... planet gear support plate, 111 ... inner rotor, 112 ... Stator coil 116 ... Motor shaft

Claims (6)

In a battery-assisted bicycle having a human power drive unit including a pedal crankshaft for transmitting a pedaling force and a motor drive unit including a motor for generating auxiliary power combined with the human power drive unit,
A first one-way clutch configured to couple the members arranged on the inner circumference and the outer circumference on the same axis and transmitting the rotation of the motor drive unit to the rear wheel; and a brake means for braking the rear wheel;
And a direct connection means for directly connecting the first one-way clutch in response to the urging force of the brake means. bicycle. A drive sprocket directly connected to the rear wheel via a chain;
A second one-way clutch that transmits the rotation of the pedal crankshaft to the drive sprocket,
The battery-assisted bicycle according to claim 1, wherein the motor drive unit is coupled to the drive sprocket via the first one-way clutch. It has a cylindrical rear wheel hub,
The motor drive is housed in the rear wheel hub;
The battery-assisted bicycle according to claim 1, wherein the first one-way clutch is provided between an output shaft of the motor drive unit and the rear wheel hub. The battery-assisted bicycle according to any one of claims 1 to 3, wherein the direct connection means is biased by an operating force of the brake means . Detecting means for detecting operation of the brake means;
5. The battery-assisted bicycle according to claim 1 , further comprising an electromagnetic unit that urges the direct connection unit in response to an operation detected by the detection unit . A drive sprocket coupled to the motor drive through the first one-way clutch;
A rear sprocket provided coaxially with the rear wheel ;
A chain directly connecting the drive sprocket and the rear sprocket;
A third one-way clutch for transmitting the rotation of the rear sprocket to the rear wheel;
2. The battery- assisted bicycle according to claim 1, further comprising second direct coupling means for directly coupling the third one-way clutch in response to urging of the brake means .

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