JPH08164886A - Bicycle with electric auxiliary motive power - Google Patents

Abstract

PURPOSE: To restrain increase in weight and the number of parts and restrcition to accessories to the minimum while keeping steadiness by storing an electric motor to generate auxiliary motive power and batteries to feed electricity to the electric motor in a pipe frame. CONSTITUTION: Batteries 2 to feed electricity to an electric motor to generate auxiliary motive power is stored in a seat tube 32 which is a part of a pipe frame 3. That is, a plural number of the batteries 2 are aligned in a line and stored in a case 20, and the case 20 with a plural number of the batteries 2 is inserted into the seat tube 32 from an upper end part of the seat tube 32. Thereafter, the case 20 is pressurized and fixed by energizing it downward by a spring 53 installed on a lower end of a seat pillar 51 supporting a saddle 5. Consequently, as the batteries 2 are equipped in the pipe frame 3, it is possible to restrain increase of weight and the number of parts and restriction to accessories to the minimum without damaging outer appearance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle, and more particularly to a bicycle with a battery and an electric motor and having an electrically assisted power.

[0002]

2. Description of the Related Art A conventional bicycle with electric auxiliary power, in which an electric motor for generating auxiliary power and a battery for supplying electric power to the electric motor are fixed to a pipe frame, is mounted on a chain stay 136 of a bicycle frame 103, for example, as shown in FIG. Electric motor 101 housed in a fixed casing 110
And a battery 102 mounted on a bed-like base fixed to the seat tube 132 and the seat stay 135.

[0003]

However, in the conventional bicycle with electric auxiliary power, the power source and the electric motor are externally attached to the outside of the frame structure of the bicycle as described above. Therefore, there are inconveniences such as restrictions on the equipment due to the structure of the tires and the mounting of the cargo bed, and a new structural member is required to install the battery and the electric motor, resulting in an increase in the number of parts and weight. Was there.
Further, there is a drawback that the battery and the electric motor are vulnerable to a shock such as a fall. Moreover, the conventional bicycle with electric power assist has not only the drawback of impairing the functional performance, but also the problem of poor aesthetics, impairing the lightness and smartness inherent in the bicycle. There was a flaw.

Therefore, the bicycle with the electric auxiliary power of the present invention is equipped with an electric motor as an auxiliary power source and a battery as its power source so as not to appear in the appearance. Thereby,
To provide a bicycle with electric auxiliary power that has the appearance of giving a smart feeling and lightness that are almost the same as ordinary bicycles, while being robust, while increasing the weight and the number of parts and limiting the restrictions on equipment items to the minimum. The present invention is a problem to be solved.

[0005]

A first structure of a bicycle with electric auxiliary power according to the present invention is a bicycle with electric auxiliary power in which an electric motor for generating auxiliary power and a battery for supplying electric power to the electric motor are fixed to a pipe frame. The battery is stored in the pipe frame.

A second structure of the bicycle with electric auxiliary power of the present invention is a bicycle with electric auxiliary power in which an electric motor for generating auxiliary power and a battery for supplying electric power to the electric motor are fixed to a pipe frame, wherein the electric motor is the pipe frame. It is characterized by being stored in. A third structure of the bicycle with electric power assist according to the present invention is characterized in that, in the second structure, the pipe frame also serves as a part of a stator core of the electric motor.

According to a fourth structure of the bicycle with electric power assist of the present invention, in the first structure or the second structure, the ground terminal of the battery and the ground terminal of the electric motor are connected to the pipe frame. Characterize. A fifth configuration of the bicycle with electric power assist according to the present invention is characterized in that, in the first configuration, the battery is stored in a seat tube of the pipe frame.

A sixth structure of the bicycle with electric auxiliary power of the present invention is characterized in that, in the second structure, the electric motor is stored in a down tube of the pipe frame. The seventh configuration of the bicycle with electric assist power of the present invention is
In the fifth configuration, a handle is inserted into the upper end portion of the seat tube, which has a handle at the upper end and a cylindrical case that accommodates the battery inside and is detachably stored in the seat tube. It is accommodated in a seat pillar for supporting the saddle.

A seventh structure of the bicycle with electric assist power of the present invention is the fifth structure according to the fifth structure, wherein a conductive seat pillar for supporting a saddle inserted into the upper end portion of the seat tube has a conductive spring at the lower end. And a tip located near the axis of the spring forms an electrode connected to one electrode of the battery.

[0010]

ACTION AND EFFECTS OF THE INVENTION First and second configurations of the present invention
Since the battery and the electric motor are housed in the pipe frame, the electric power assisted bicycle of the configuration is not apparently equipped with the auxiliary power and does not spoil the appearance.
In addition, it does not require the installation of new structural members such as a pedestal for equipping batteries and electric motors, and not only avoids unnecessary increase in weight and the number of parts, but also tires, luggage racks,
There is no space limitation when installing other equipment.

Therefore, it becomes possible to equip the auxiliary power without impairing the original lightness and smartness of the bicycle or the healthy and sporty appearance. Further, since the battery and the electric motor are installed in a sturdy pipe frame, they can be robustly protected against impacts such as a fall. Furthermore, since the minimum weight and the increase in the number of parts can be kept, there is an effect that the performance can be improved by reducing the weight and the cost can be reduced by decreasing the number of parts. Further, since the bicycle accessories can be installed as they are without any restriction, there is an effect that the user has more option options and is preferable.

According to the third structure of the present invention, since the pipe frame also serves as a part of the stator core of the electric motor, not only the number of parts and weight are further reduced, but also the rotation of a larger diameter in the pipe frame is achieved. Equipped with an armature (rotor), high torque and high power auxiliary power can be obtained. Therefore, there is an effect of further improving the performance by reducing the weight of the electric motor and improving the output, and a cost reduction by reducing the number of parts. Not only that, but because a shaft output with a higher torque can be obtained than when the entire stator core of the electric motor is installed inside the inner peripheral surface of the pipe frame, it is usually adopted to transfer the shaft output of the electric motor to the driving wheels. It is possible to reduce the size and weight of the reduction gear and improve reliability.

According to the fourth structure of the present invention, since the ground terminal of the battery and the ground terminal of the electric motor are connected to the pipe frame, a current flows between the battery and the electric motor through the pipe frame of a good conductor, and wiring is performed. Can be saved.
As a result, not only cost can be reduced, but also failures due to disconnection of wiring can be reduced. According to the fifth and sixth configurations of the present invention, since the battery is stored in the seat tube of the pipe frame and the electric motor is stored in the down tube of the pipe frame, the battery can be accessed by removing the saddle. Can be done easily.

Further, in the seventh structure of the present invention, since the case is provided with a handle extending from the upper end of the case for accommodating the battery and reaching the upper end of the seat tube, if the seat pillar for supporting the saddle is removed. You can easily pull out the battery together with the case by grasping the handle that is exposed there. Therefore, there is an effect that inspection and maintenance of the power supply system and battery replacement become extremely easy.

In the eighth structure of the present invention, the electrode is provided at the tip of the conductive spring extending from the lower end of the seat pillar, and the electrode is connected to one electrode of the battery and grounded to the pipe frame. A case and a lid with electrodes are not required, which reduces the number of parts and costs.

[0016]

Embodiments of the present invention will be described below with reference to FIGS. (Embodiment 1) As shown in FIG. 1, in a bicycle with electric auxiliary power as Embodiment 1 of the present invention, an electric motor 1 for generating auxiliary power and a battery 2 for supplying electric power to this electric motor 1 are stored in a pipe frame 3. It is characterized by being.

The pipe frame 3 includes a down tube 31 that bridges from a head tube 34 that pivotally supports a handle and a front fork to a joint frame 4 that pivotally supports a pedal crank, and a saddle 5 that extends upward from the joint frame 4. A supporting seat tube 32,
It has a top tube 33 that bridges between the upper end of the seat tube 32 and the head tube 34. Therefore, the down tube 31, the seat tube 32, and the top tube 33 form a triangle structure. In addition to this structure, the seat tube 32, the seat stay 35 supporting the rear wheel, and the chain stay 36 are
Another triangle structure is formed, and the pipe frame 3 as a whole has a frame structure called a diamond type. However, although the pipe frame 3 of the present embodiment has a diamond shape, it is also possible to adopt other frame shapes such as a double loop type having the down tube 31 and the seat tube 32 and a staggered type.

Here, the electric motor 1 is stored in the down tube 31 of the pipe frame 3, and the battery 2 is stored in the seat tube 32 of the pipe frame 3.
The electric motor 1 stored in the down tube 31 is shown in FIG.
As shown in (a), it has a shape that is longer in the axial direction than an ordinary electric motor, and is equipped integrally with the down tube 31. The down tube 31 is made of mild steel and also serves as a part of the stator core of the electric motor 1, that is, a yoke. A plurality of permanent magnets 11 are fixed to the inner peripheral surface of the down tube 31 in contact with the inner peripheral surface of the down tube 31 at equal intervals in the circumferential direction. Is forming. Multiple permanent magnets 11
An auxiliary yoke 10a is arranged in the gap between the two to fix the permanent magnet 11. The auxiliary yoke 10a is welded and fixed to the rear lid 15 and the front lid 16.

A rotating armature (rotor) 12 is disposed inside the stator 10 composed of the permanent magnet 11 and the down tube 31 described above, and the rotating armature 12 is an electric machine fitted to a rotating shaft 13. The armature main body 12a includes an armature core and an armature coil wound around the armature core, and a commutator 12b fitted to the rotary shaft 13 adjacent to the armature main body 12a. Since the armature structure itself of such a DC motor is well known, its detailed description is omitted. The rotating shaft 13 is disposed coaxially with the down tube 31, and is rotatably supported by the down tube 31 via a pair of bearings 14. The bearing 14 is a maintenance-free bearing made of oil-impregnated metal,
It is fixedly supported in the down tube 31 by a rear lid 15 and a front lid 16, respectively.

A brush holder 17 having a brush (not shown) for supplying electric power to the commutator 12b of the rotary armature 12 is attached to the rotary armature 12 side of the front lid 16. The two insulated electric wires 18 extend from the brush holder 17 to the outside of the down tube 31 and are wired and connected to the battery 2, which will be described later, a switch (not shown), and the like. As shown in FIG. 2B, these insulated wires 18 are led out to the outside through a notch groove 19 provided in the vicinity of the joint of the down tube 31 with the joint frame 4, and are wired. Electric power is supplied to the electric motor 1 through 18.

A not-shown rubber bush is provided in the cutout groove 19 through which the insulated wire 18 is led out.
This rubber bush has a hole through which the insulated electric wire 18 is inserted, and seals between the insulated electric wire 18 and the cutout groove 19 in a watertight manner,
Rainwater and dust are prevented from entering the inside of the electric motor 1.
The above-mentioned electric motor 1 is assembled in the following procedure.

First, notches (a plurality of permanent magnets 1
A plurality of permanent magnets 11 are fixed to the notches of the cylindrical auxiliary yoke 10a having a slit 1 for fitting 1 by fitting brazing, welding or adhesion.
Next, after inserting the rotary shaft 13 of the rotary armature 12 into the bearing 14 of the front lid 16 to which the brush holder 17 has already been assembled, the rotary armature 12 is inserted inside the auxiliary yoke 10a and the permanent magnet 11 described above. . Then, after inserting the other end of the rotary shaft 13 into the bearing 14 of the rear lid 15, the rear lid 15 and the front lid 16 are welded to both ends of the auxiliary yoke 10a. Thus
Permanent magnet 11, rotating armature 12, rotating shaft 13, bearing 1
4, a rear cover 15, a front cover 16, and a brush holder 17 are integrally formed as an electric motor assembly.

The above-mentioned electric motor 1 is completed by inserting the above-mentioned electric motor assembly into the down tube 31 and fixing it at a predetermined position by welding or screwing. Here, if the magnetic properties of the down tube 31 as a yoke (yoke) are sufficient, the auxiliary yoke 10a may be formed of a non-magnetic material having excellent mechanical strength, corrosion resistance, and bondability with the magnet 11. Is.

Further, as another means for manufacturing an electric motor assembly, instead of using a cylindrical auxiliary yoke 10a having a notch on the side surface, a plurality of permanent magnets 1 are provided on the inner peripheral surface.
A method of manufacturing a motor assembly by using a cylindrical motor case made of a thin iron plate having a high magnetic flux saturation density, which holds 1 in a fixed manner, and fixing the rear lid 15 and the front lid 16 to both ends of the motor case by welding or the like. is there. In this case, when the electric motor assembly is inserted into the down tube 31 and fixed at a predetermined position, the magnetic flux of the permanent magnet 11 flows into the down tube 31 through the thin motor case, and the down tube 31 functions as a yoke together with the motor case in the previous period. Fulfill.

The electric motor 1 assembled as described above
The tip end of the rotary shaft 13 protruding from the front lid 16 side penetrates into the joint frame 4 and rotationally drives the bicycle chain sprocket via a reduction gear (not shown) in the joint frame 4. A reduction gear mechanism with a centrifugal clutch may be used to transmit power only when the electric motor 1 is rotating.

On the other hand, the battery 2 housed in the seat tube 32 is housed in the seat tube 32 which is a part of the pipe frame 3, as shown in FIG. That is, the plurality of batteries 2 are arranged in series and housed in the case 20, and the case 20 and the seat tube 3
2 Inserted into the seat tube 32 from the upper end. Then, the case 20 includes the seat pillar 5 that supports the saddle 5.
A spring 53 attached to the lower end of 1 urges it downward to press and fix it. The seat pillar 51 is
By tightening the fastening screw 52, the seat tube 32
Fixedly supported by.

An insulating cover 21 is fitted and attached to the upper end of the case 20 for accommodating the battery 2. A spring-shaped electrode 22 that comes into contact with the cathode of the battery 2 is provided on the battery 2 side of the lid 21, and from the opposite side,
An insulated wire 23 connected to the electrode 22 extends. The insulated wire 23 is connected via the connector 23c at a position protruding from the seat tube 32, and further, as shown in FIG.
As shown in (c), the case 20 is wired along a cut provided in a vertical direction and reaches the vicinity of the lower portion of the seat tube 32. It should be noted that instead of a cut, a groove may be carved on the outer peripheral surface of the case 20, or the case 20 and the seat tube 3
The insulated wire 23 may be wired by providing a gap between the insulated wire 23 and the wire 2. On the contrary, the lower end surface of the case 20 is the anode 2 of the battery 2 at the lower end.
Insulator stopper 2 having electrode 25 abutting 4 on the upper surface
6 is abutted and fixed, and an insulated wire 27 connected to the electrode 25 extends from the stopper 26.

These insulated wires 23 and 27 are shown in FIG.
As shown in (a) and (b), the seat tube 32
It is led out of the seat tube 32 from a cutout groove 28 provided in the vicinity of the joint with the joint frame 4 at the lower end. These insulated wires 23 and 27 are connected to the electric motor 1 described above, as well as switches, charging terminals, and the like, which will be described later. A rubber bush is provided in the cutout groove 28 through which the insulated wires 23 and 27 are led out, and the cutout groove 28 is watertightly closed, so that rainwater and dust may not enter. There is no.

The plurality of batteries 2 built in the seat tube 32 are commercially available nickel-cadmium secondary batteries made in accordance with the dry cell battery I standard, and can be repeatedly charged and used. Therefore, the cost and maintenance cost of the battery 2 is lower than that of the case where a special battery is specially manufactured.
It is much cheaper. When the battery 2 is exhausted, the saddle 5 and the seat pillar 51 shown in FIG.
Fastening screw 5 attached to the upper end of the seat tube 32
By loosening and removing 2, the battery 2 can be pulled out together with the case 20 and replaced with a new battery. Case 2
When pulling out 0, after removing the seat pillar 51, the insulated wire 23 protruding from the seat tube 32,
The connector 23c for connecting 23 is temporarily removed, and then the case 20 is pulled out by turning the pipe frame 3 upside down. At that time, it is possible to replace it with a secondary battery with improved performance, or temporarily insert a disposable dry battery to surpass the emergency.

FIG. 4 shows an example of a circuit configuration using the electric motor 1 and the battery 2 described above. The electric motor 1 is connected to the battery 2 via a switch SW attached to the handle (not shown) of the bicycle, and the switch SW on the handle
ON / OFF can be switched by the driver's operation. Moreover, in the circuit of FIG. 4, the charging terminal C is provided in parallel with the battery 2. Here, the insulated wire 1 described above
8, 18, 23 and 27 are wired as shown in FIG. 4, respectively.

Since this embodiment is constructed in this way, the auxiliary power equipment is not apparent in appearance, and the appearance is not impaired. Furthermore, since the electric motor 1 and the battery 2 are installed in the pipe frame 3, not only is it robust and resistant to shocks such as when it falls, it is possible not only to avoid an unnecessary increase in weight and the number of parts, but also to restrict space. It never happens. Therefore, the bicycle is robust and does not impair the original lightness and smartness of the bicycle, or the healthy and sporty appearance. Furthermore, since the increase in weight and the number of parts can be suppressed to a minimum, there is an effect that performance can be improved by reducing the weight and cost can be reduced by reducing the number of parts as compared with the conventional bicycle with electric auxiliary power. Also, since you can equip normal bicycle equipment without restrictions,
This also has the effect of increasing the number of option options for the user, which is preferable.

Further, since the pipe frame 3 also serves as a part of the stator core of the electric motor 1, the electric motor 1 can have a large diameter and can exhibit high output with high torque. Therefore, further improvement in performance can be expected, and reduction gears and the like can be expected to be downsized and inexpensive. Although the entire pipe frame 3 is usually made of high-strength steel, only the portion of the down tube 31 corresponding to the stator core of the electric motor 1 may be made of a material having excellent magnetic characteristics. Alternatively, only the portion of the pipe frame 3 corresponding to the electric motor 1 may be formed of a thick soft magnetic cylinder, and the other portions may be made of light alloy or FRP to reduce the weight.

Although the electric motor 1 is a so-called permanent magnet field type DC electric motor in this embodiment, the type of the electric motor 1 is not limited to this. For example, it is possible to use a brushless motor with a drive circuit,
To put it to the extreme, it is also possible to equip an AC motor with a circuit for generating AC. Further, in this embodiment, the battery 2
Has been defined as a single I standard, but there is no need to be particular about this and any other standard can be applied as long as it can be accommodated in the pipe frame 3. Further, the wiring is not limited to the series only, and the series and parallel may be appropriately used depending on the voltage and current requirements. Alternatively, the case 20 may be eliminated by developing an integrated cartridge type battery.

(Embodiment 2) A bicycle with electric power assist as a second embodiment of the present invention will be described with reference to FIG. 1 again. In the pipe frame 3 in which the electric motor 1 and the battery 2 are made of a conductive alloy. The external appearance is almost the same as that of the first embodiment. Therefore, as in the first embodiment, the electric motor 1
Is stored in the down tube 31, and the battery 2 is stored in the seat tube 32.

The electric motor 1 housed in the down tube 31 is a so-called permanent magnet field type DC electric motor as shown in FIG. 5 (a). That is, the electric motor 1 is surrounded by a part of the stator core, that is, a down tube 31 that also serves as a yoke (yoke), a plurality of permanent magnets 11 arranged in contact with the inner peripheral surface thereof, and a plurality of permanent magnets 11. A rotating armature 12 that rotates in space, a rotating shaft 13 thereof, a pair of bearings 14 that pivotally support the rotating shaft 13, a rear lid 15 and a front lid 16 that fixedly support the bearing 14 coaxially with the down tube 31, and a front lid 16. Fixed to the commutator 1 via a brush (not shown)
A brush holder 17 for supplying power to 2a is provided.

In the electric motor 1 described above, first, the electric motor assembly described below is manufactured outside the down tube 31,
After this, attach this motor assembly to the down tube 3
It is manufactured by inserting it into the inside of 1 and fixing it in place by welding or screwing. The above-described electric motor assembly includes a rotary armature 12 in which a rotary shaft 13 is supported by a pair of bearings 14,
A rear lid 15 for holding the bearing 14, a front lid 16 for holding the bearing 14 and fixing and holding the brush holder 17, and a brush holder 17 and a rear lid 15 held by the front lid 16 are connected and fixed by welding or brazing. It is composed of a plurality of permanent magnets 11. Therefore, the electric motor assembly has a cage-shaped cylindrical outer surface formed by a plurality of permanent magnets 11 in a cage shape and both end surfaces formed by the rear lid 15 and the front lid 16, and has a rotation inside thereof. It is an integral structure that holds a rotating armature 12 that is freely supported.

The configuration and assembling method of the electric motor 1 are not limited to those described above, and the configuration and assembling method disclosed in the first embodiment may be used. Alternatively, it is possible to assemble each element of the electric motor 1 in the down tube 31 in order, though it is difficult to assemble. Two insulated wires 18 and 18E are output from the brush holder 17 of the electric motor 1 described above, and one insulated wire 18 extends outside the down tube 31 as in the first embodiment, but the other insulated wire. 18E is a ground terminal, which is connected to the pipe frame 3 through a conductive down tube 31. Therefore, as shown in FIG. 5B, unlike the first embodiment, only one insulated wire 18 extends outward from the cutout groove 19 of the down tube 31 incorporating the electric motor 1. The electric wire 18 is connected to the battery 2 by wiring via a switch described later. The cutout groove 19 through which the insulated wire 18 is led out is watertightly closed by a rubber bush, and rainwater and dust do not enter the electric motor 1.

The deceleration gears (not shown) in the joint frame 4 are the same as those in the first embodiment. on the other hand,
The battery 2 stored in the seat tube 32 is shown in FIG.
As shown in (a), it is housed in the case 20 and housed in the seat tube 32. The case 20 has a spring 53 fixed to the seat pillar 51 and protruding downward.
The seat tube 32 is urged by and is pressed and fixed to the stopper 26 provided in the lower portion of the seat tube 32.

A conductive lid 21 having a spring-shaped electrode 22 is screwed onto the upper end of the case 20. The case 20 is also made of a good conductor, and the case 20 also serves as a ground terminal and contacts the inner peripheral surface of the seat tube 32 that has been subjected to the conductive treatment, and electrically connects the electrode 22 that contacts the cathode of the battery 2. It is connected to the pipe frame 3. In order to connect the case 20 which also functions as a ground terminal to the inner peripheral surface of the seat tube 32 satisfactorily,
There are bulges (not shown) formed here and there. Therefore, it is not necessary to guide the insulated wire 23 to the lower end of the seat tube 32 as in the first embodiment, and the cross section of the case 20 is shown in FIG.
As shown in (c), the battery 2 may surround the entire periphery of the battery 2.

The insulated wire 27 connected to the electrode provided on the upper surface of the stopper 26 is shown in FIGS. 6 (a) and 6 (b).
As shown in FIG. 5, as in the first embodiment, the battery 2 is led out to the outside, and the battery 2 is connected to the electric motor 1 described above, as well as a switch, a charging terminal, and the like described later. The groove 28 is watertightly closed by a rubber bush (not shown), and rainwater and dust do not enter.

FIG. 7 shows an example of a circuit configuration using the electric motor 1 and the battery 2 described above. The electric motor 1 is connected to the battery 2 via a power transistor PT and a switch SW attached to a handle (not shown) of the bicycle. The power transistor PT is a well-known control circuit CNT.
The output voltage is controlled by the base voltage of. The control circuit CNT is controlled by a variable resistor V mounted on a bicycle handle (not shown). The above-mentioned switch SW and variable resistor V are incorporated in one case (not shown) on the handle and interlock with each other, and gradually move from the switch-off state to the switch-on slight force output to the full force output. Has been done. Therefore, the driver can operate the electric motor 1 with an arbitrary output by operating the variable resistor V that operates in conjunction with the switch SW. The operating device for operating the switch SW and the variable resistor V is not particularly limited, but it is also possible to equip the handle with an operating device in the shape of an accelerator grip of a motorcycle.

Further, in the circuit of FIG. 7, the charging terminal C is provided in parallel with the battery 2. Here, the insulated wire 18,
27 is connected via a switch SW. On the other hand, the case 20 as the ground terminal 18E of the electric motor 1 and the ground terminal of the battery 2 is grounded to the conductive pipe frame 3, and similarly, one pole of the charging terminal C is also grounded to the pipe frame 3. The corresponding wiring is omitted as compared with the first embodiment. Although a grounding symbol is drawn in the figure, this means that the pipe frame 3 is grounded, not the ground.

Now, referring again to FIG. 6, the battery 2 is also a secondary battery similar to that of the first embodiment. However, when replacing the battery 2, a device not provided in the first embodiment is provided.
That is, the case 20 has a handle 29 made of synthetic fiber extending from the lid 21 at the upper end of the case 20.
The leading end of the sheet reaches the upper end of the seat tube 32 and is accommodated in the seat pillar 51 that supports the saddle 5. Therefore, when the saddle 5 and the seat pillar 51 are removed by loosening the fastening screws 52 at the upper end of the seat tube 32, the head of the handle 29 projects from the upper end of the seat tube 32.
Therefore, by pulling this by hand, the case 20 for storing the battery 2 can be easily pulled out from the seat tube 32. At this time, since the protrusion 201 is provided on the inner peripheral side of the lower end of the case 20, the battery 2 does not fall out from the lower end of the case 20.

The lower end of the handle 29 may be directly fixed to the case 20 instead of the lid 21. Since the present embodiment is configured in this way, in addition to the effects of the first embodiment, there are the following effects. That is, the electric motor 1
Since the grounding terminal 18E and the conductive case 20 that also serves as the grounding terminal of the battery 2 are grounded to the pipe frame 3 of the conductor, the wiring can be saved, the cost can be reduced, and the breakdown due to the disconnection can be reduced. Produces the effect of Further, since the handle 29 is provided on the case 20 of the battery 2, the battery 2 can be easily pulled out together with the case 20, and there is an effect that inspection and maintenance of the power supply system and replacement of the battery are extremely easy.

The case 20 is discarded, the plurality of batteries 2 are directly inserted into the seat tube 32, and then the lid 21 which also serves as a ground terminal of the battery 2 is inserted, and the spring 53 fixed to the seat pillar 51. It is also possible to press and fix by urging with. In this case, the means for attaching the grip 29 to the lid 21 and the spring 5 as in the second embodiment.
There is a means for fixing the lid 21 to the tip of 3.

In this case, if a tape-shaped pull-out handle with a plastic hook is prepared and the hook is inserted into the tip of the battery 2 to be inserted first, the seat pillar 51 is removed. The battery 2 can be easily taken out by manually pulling the tape-shaped pulling handle. Alternatively, as shown in FIG. 8, a conductive seat pillar 51 for supporting the saddle 5 inserted into the upper end portion of the seat tube 32 has a conductive spring 53 at the lower end, and a conductive spring 53 is provided near the axial center of the spring 53. It is also possible that the positioned tip forms an electrode 53a connected to one electrode of the battery 2. The joint portion of the spring 53 with the seat pillar 51 is joined and fixed by welding firmly and with good conductivity. On the other hand, the electrode 53a at the tip of the spring 53 is plated with a copper alloy or a gold alloy, which causes rust and the like. Prevents poor contact. Seat pillar 5 with spring 53
When 1 is inserted into the seat tube 32 with a pressing force and is fixed by the fastening screw 52, the spring 53 is compressed, so that the electrode 53a comes into contact with the battery 2 with a pressing force. Therefore, the battery 2 is biased and fixed without being jumped by the impact acceleration. The electrode at the upper end of the battery 2 is grounded to the seat tube 32, that is, the pipe frame 3 via the electrode 53a, the spring 53, and the seat pillar 51. It is also possible to provide a grounding terminal for short-circuiting and grounding directly from the electrode 53a at the tip of the spring 53 to the seat tube 32.

According to the above-mentioned structure in which the electrode 53a is provided at the tip of the spring 53, the case and the lid with the electrode are not required, the number of parts and the cost are reduced, and the maintainability is slightly improved. .

[Brief description of drawings]

FIG. 1 is a side view of a bicycle with electric auxiliary power as a first embodiment of the present invention.

2 is an enlarged view of part II (motor portion) of FIG. 1, (a) is a partial sectional view, (b) is a partial side view of (a).

FIG. 3 is an enlarged view of part III (battery storage portion) of FIG. 1, (a) is a partial sectional view, (b) is a partial side view of (a), and (c) is a partial sectional view of (a).

FIG. 4 is a circuit diagram of the first embodiment.

FIG. 5 is an electric motor portion of the second embodiment of the present invention (V in FIG. 1).
(A) is an enlarged view (a) is a partial sectional view (b) is a partial side view of (a)

FIG. 6 is a view showing a battery storage portion (V of FIG. 1) of a second embodiment of the present invention.
Part (a) is an enlarged view, (a) is a partial sectional view, (b) is a partial side view of (a), (c) is a partial sectional view of (a).

FIG. 7 is a circuit diagram of a second embodiment.

FIG. 8 is a partial cross-sectional view near a seat pillar having an electrode at the tip of a spring.

FIG. 9 is a side view of a conventional bicycle with electric auxiliary power.

[Explanation of symbols]

1: Electric motor 10: Stator 11: Permanent magnet 12: Rotating armature 18: Insulated wire 18E: Ground terminal 2: Battery 23,
27: Insulated wire 20: Case (also used as a ground terminal in Example 2) 29:
Handle 3: Pipe frame 31: Down tube 32: Seat tube 4: Joint frame 5: Saddle 51: Seat pillar 53: Spring 53a: Electrode

Claims (8)

[Claims] 1. A bicycle with electric auxiliary power in which an electric motor for generating auxiliary power and a battery for supplying electric power to the electric motor are fixed to a pipe frame, wherein the battery is stored in the pipe frame. Bicycle with auxiliary power. 2. A bicycle with electric auxiliary power in which an electric motor for generating auxiliary power and a battery for supplying electric power to the electric motor are fixed to a pipe frame, wherein the electric motor is stored in the pipe frame. Bicycle with auxiliary power. 3. The bicycle with electric auxiliary power according to claim 2, wherein the pipe frame also serves as a part of a stator core of the electric motor. 4. The ground terminal of the battery and the ground terminal of the electric motor are connected to the pipe frame.
Alternatively, the bicycle with the electric assist power according to claim 2. 5. The bicycle with electric auxiliary power according to claim 1, wherein the battery is stored in a seat tube of the pipe frame. 6. The bicycle with electric auxiliary power according to claim 2, wherein the electric motor is stored in a down tube of the pipe frame. 7. A cylindrical case having an upper end with a handle and accommodating the battery therein and detachably stored in the seat tube, wherein the handle is inserted into the upper end of the seat tube. The bicycle with electric auxiliary power according to claim 5, wherein the bicycle is housed in a seat pillar for supporting the saddle. 8. A conductive seat pillar for supporting a saddle, which is inserted into an upper end portion of the seat tube, has a conductive spring at a lower end, and a tip located near an axial center of the spring is one of the batteries. The bicycle with electric auxiliary power according to claim 5, wherein an electrode connected to the electrode is formed.