JP2001247069A - Power assist bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate loading-unloading work of a cargo to a rear loading space by restraining the loading space height in the same as an ordinary bicycle even if a battery unit is installed on the rear loading space, to attain travel stability and stopping time stability at stand using time, to improve external appearance design by maximally thinning the unit, and to prevent impairment of a role as an ordinary rear loading space even if the unit is arranged on a rear wheel. SOLUTION: In this power assist bicycle 1, the battery unit 30 is provided with battery cases 31, 32 having a battery housing box of rectangular solids in tandem in the bilateral symmetry at an interval, single batteries 3 housed in a transversely installed state in the respective cases, a power supply connector 39 and a charging connector 38 installed on the front end of the battery cases 31, 32, a front side battery case receiving frame 34 and a rear side battery case receiving frame 35 being installed on the lower side front and rear ends of the rear loading space 20 and supporting the battry cases, and is constituted so as to be flatly mountable on the lower side in an occupying plane of the rear loading space 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrically assisted bicycle, and more particularly, to a structure of a battery unit for accommodating a rechargeable battery mounted on the electrically assisted bicycle and its mounting structure.

[0002]

2. Description of the Related Art Generally, a rechargeable battery serving as a power source for a motor of an electrically assisted bicycle occupies a large weight with respect to the total weight of the bicycle, and it is desirable that the installation place be as close as possible to the center of gravity of the bicycle. For this reason, a battery case is often installed at a position around the pipe frame below the saddle or along an oblique frame that supports the front wheels. However, since a commercially available bicycle is usually made to have a function limit that can be driven by human power, sufficient space necessary for mounting a battery cannot be obtained around the main frame. For this reason, in the electric assist bicycle, a frame structure specially made including the installation of the electric motor is inevitable.

On the other hand, if the battery is to be mounted without largely changing the structure of a commercially available bicycle, it is convenient to set the battery at the position of the front carrier above the front wheel or at the position of the rear carrier above the rear wheel. . However, the weight of the battery is about 4k
Since there is also a g, it is not preferable because placing the battery on the front carrier of the front loading bed makes the handle heavy and adversely affects the maneuverability. Also, the rear carrier is close to the center of gravity of the bicycle and close to the saddle, so there is little effect on maneuverability. Some bicycles with batteries mounted at this position are publicly introduced. For example, in the conventional example disclosed in JP-A-6-156362, a double rectangular parallelepiped battery case is attached to the upper part of the rear wheel so as to be divided into right and left sides and symmetrically. 10
The single type rechargeable batteries are housed in a single vertical line, and have approximately the same weight on the left and right with respect to the bicycle.

[0004]

In the above-mentioned conventional structure in which the battery case is disposed on the rear carrier of the electric assist bicycle, the battery case is mounted on the upper portion of the rear carrier. Is provided with an extra protective frame which is elongated in the front and rear direction and which extends laterally to protect the battery case. In addition, although it is possible to load luggage on the upper surface of the battery case, it is not only difficult to load luggage due to an increased loading position, but also it is necessary to make the structure of the battery case robust.

The present invention has been made in view of such circumstances, and has as its object to reduce the height of a loading case to the level of a normal bicycle even when a battery case (unit) is mounted on the rear loading bed. It facilitates loading and unloading of luggage to and from the carrier, stabilizing running and stopping when using the stand, and making the battery unit as thin as possible to improve the external design, and at the same time placing the battery unit on the rear wheel. It is an object of the present invention to provide a battery unit and a power-assisted driving bicycle including a mounting structure for a battery unit that does not impair the role of a normal rear carrier even if it is disposed.

[0006]

The structure of the present invention that achieves the above object has the following features. (1) In an electric assist drive bicycle in which an electric assist drive unit is added to a stepping drive unit, a rechargeable battery unit that supplies electric power to the electric motor has a two-sided rectangular parallelepiped battery storage box spaced apart and symmetrically. Battery case, a single-type rechargeable dry battery stored horizontally in a storage box of each battery case, a power supply connector and a charging connector attached to a front end of the battery case, and front and rear ends of a lower rear carrier. And a front battery case receiving frame and a rear battery case receiving frame that support the battery case, and can be mounted flat below the occupied surface of the rear loading platform. (2) A slide rail for supporting the battery case movably in the front-rear direction is provided below the rear loading platform between the front battery case receiving frame and the rear battery case receiving frame of the battery unit described in (1). The battery case is of a detachable type that can be pulled out horizontally, and a lock key is provided on the rear loading platform to both fix the position of the battery case and prevent theft. (3) The battery case slide rail described in (2) has an iron plate structure integrated with the rear loading platform to support the battery case and to exclude the rear battery case receiving frame. (4) In the above-described electric assist drive bicycle, the rechargeable battery unit that supplies electric power to the electric motor includes a pair of rectangular battery cases and a single-type rechargeable dry-type battery that is stored horizontally in each of the battery cases. A battery, a power distribution connector attached to a front end of the battery case, and a front battery case receiving frame and a rear battery case attached to front and rear ends below a rear carrier, supporting the battery case at right and left sides with an interval. A receiving frame, a power supply connector and a charging connector attached to the front side of the front battery case receiving frame, and a lock key for fixing the position of the battery case and preventing theft is provided on the rear loading platform. (5) In the battery unit described in (4),
A pair of slide rails having an iron plate structure corresponding to each battery case are provided integrally and in parallel with the rear loading platform to support the respective battery cases and to exclude the rear battery case receiving frame. (6) In the above-described electric assist drive bicycle, the rechargeable battery unit that supplies electric power to the electric motor includes: a battery case having two rectangular parallelepiped battery storage boxes spaced apart from each other and symmetrically; A single-type rechargeable dry battery stored vertically in two rows in a storage box, a power supply connector and a charging connector attached to a front end of the battery case, and attached to a lower front end of a rear loading platform; A front battery case receiving frame for supporting the battery case; and a slide rail of an iron plate structure integrated with the rear loading platform provided to support the battery case movably in the front-rear direction below the back of the front battery case receiving frame. A lock key that also serves to fix the position of the battery case and prevent theft on the rear carrier,
The upper part of the rear wheel is housed in the space between the battery cases on both sides, and the battery case is configured to be detachable so that the battery case can be pulled out horizontally. (7) In the above-described electric assist drive bicycle, the rechargeable battery unit that supplies electric power to the electric motor includes a pair of rectangular parallelepiped battery cases and a single type that is vertically arranged in each of the battery cases and housed in two rows. A rechargeable dry battery, a power distribution connector attached to the front end of the battery case, and a connector engaged with the power distribution connector of the battery case; and A battery case receiving frame for supporting the battery case, a pair of slide rails of an iron plate structure provided in parallel with the battery case and integrally with the rear carrier, and a power supply mounted on the front side of the battery case receiving frame. A connector and a charging connector, and further the position and theft of the battery case are fixed to the rear carrier. A lock key is also provided for prevention. (8) An electric assist drive unit is added to the foot drive unit,
In an electric assist drive bicycle having a rear carrier made of a steel bar, a rechargeable battery unit for supplying electric power to the electric motor has two transverse rods extended downward and a lower central portion removed. A rear loading platform having a rectangular frame, a U-shaped guide rail integrally mounted horizontally in the traveling direction of the bicycle at the inner end of the rectangular frame, and a two-sided rectangular parallelepiped battery storage box with a space between them A single rechargeable dry battery horizontally placed in a storage box of each of the battery cases, a power supply connector and a charge connector attached to a front end of the battery case, and fixed to the rear carrier. And a lock key for both fixing the position of the battery case and preventing theft, and the battery case is configured to be able to be mounted flat below the occupied surface of the rear carrier. That it is. (9) In the electrically assisted bicycle described in (8), a protrusion having a semicircular groove that engages with a lateral passing bar of the rear luggage is provided on an upper surface of the battery case, and the protrusion is formed on the rear luggage by the protrusion. The battery case is configured to be positioned.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with a battery unit mounted on an electrically assisted bicycle based on the illustrated embodiment. Here, FIG. 1 is a side view of the entire bicycle to which the electric assist drive unit is attached. In the figure, 1 is an electric assist drive (with unit)
A bicycle 10 is an assist drive unit, 20 is a rear carrier, and a pedal 3 is provided on a frame 2 of the bicycle 1. The drive unit 10 is connected to the pedal 3
Is mounted at a front position of the bearing portion 4 for supporting the shaft. The stepping drive force is transmitted to the assist drive unit 10 via the chain 9, and in the assist drive unit 10, the assist drive force is controlled by a controller (not shown) to be added to the stepping drive force and output. This output is driven by the drive chain sprocket 1 attached to the output shaft.
1. The power is transmitted to the driven chain sprocket 12 via the chain 13, and serves as power for rotating the rear wheel 17 of the bicycle 1. A battery unit 30 (40, 50, 60, 70) containing a plurality of rechargeable batteries 33 for supplying electric power to the electric motor is attached to the lower surface of the rear carrier 20. (40, 50, 6
The outer dimensions of (0, 70) are formed smaller than those of the rear carrier 20.

A first embodiment of the present invention will be described with reference to the drawings (claims 1 and 2). 2 is a plan view showing a state where the battery unit 30 is mounted on the rear carrier 20, FIG. 3 is a side view of the battery unit 30 shown in FIG. 2, and FIG.
5 is a perspective view of the rear carrier 20 and the battery unit 30 in FIG. In the drawing, the battery case of the battery unit 30 has two rectangular parallelepiped battery storage boxes symmetrically spaced apart from each other, and is configured by combining two cases of an upper battery case 31 and a lower battery case 32. I have. That is, the battery storage room R of the battery case is provided so as to be divided right and left in the traveling direction of the bicycle 1, and a single rechargeable dry battery 33 is provided in the battery storage room R.
Are arranged in two horizontal rows with the axial direction as the longitudinal direction of the case,
Only one of the rear ends is located in a direction perpendicular to the longitudinal direction. In FIG. 2, 11 battery storage chambers R are located on the left side and 9
The battery 33 is housed therein, and an empty space on the right side is provided with an internal wiring and terminals for the wiring, and a terminal plate for connecting an external wiring.

At the front and rear ends of the rear loading platform 20, a front battery case receiving frame 34 for supporting the upper and lower battery cases 31, 32 on the front side, and a rear battery case receiving frame 35 for supporting the upper and lower battery cases 31, 32 on the rear side. The front battery case receiving frame 34 and the rear battery case receiving frame 35 are attached to the steel plate members 20 a, 20 b, 20 c, and 20 d constituting the rear carrier 20, respectively. 23.

On the lower side of the rear carrier 20, which is located between the front battery case receiving frame 34 and the rear battery case receiving frame 35 of the battery unit, upper and lower battery cases 31, 32 are provided in the upper and lower directions. A slide rail 36 movably supported is provided. The slide rail 36 is fixedly screwed to the mounting plate 22 and the mounting plate 23 which are integrally welded and fixed to the steel bar member 20b, and engages with the guide grooves 31a and 31b provided in the upper battery case 31, thereby forming the upper and lower battery parts. The cases 31 and 32 are configured to be detachable so as to be slidable in the longitudinal direction (front-back direction). Therefore, the upper and lower battery cases 31, 32
Of the bicycle 1 can be pulled out horizontally and backward by using the handle 32a attached to the battery case.

On the other hand, the upper and lower battery cases 31, 32 are engaged with a vertical groove (not shown) provided in the upper battery case 31 on the side of the rear loading platform 20, so that the upper and lower battery cases 31, 32 are engaged.
A lock key 37, which is fixed to 0 and prevents theft, is provided, and the main body of the lock key 37 is welded and fixed to the steel bar member 20a of the loading platform. The upper and lower battery cases 31 and 32 have a charging connector 38 into which a DC current terminal of an external charger is inserted and a power supply connector into which terminals for wiring for supplying a current to the electric assist drive unit 10 of the bicycle 1 are inserted. 39 are both attached.

In the electric assist drive bicycle 1 according to the first embodiment of the present invention, even if a load is placed on the rear luggage carrier 20, the load does not act on the battery unit 30, and the external dimensions of the battery lump 30 are different from those of the rear luggage carrier 20. , The battery unit 30 is protected by the rear carrier 20. Further, in the battery unit 30 of the present embodiment, although there are 20 batteries 33 and the weight is about 4 kg, the weight is distributed to the front battery case receiving frame 34, the rear battery case receiving frame 35 and the slide rail 36. Since the load is applied, the strength of the mounting structure is sufficient, and the provision of the slide rail 36 for attachment and detachment allows easy and safe operation for attaching and detaching the upper and lower battery cases 31, 32. .
Further, in the battery unit 30 of the present embodiment, since the single type batteries 33 are arranged side by side, the thickness is reduced, the appearance design is improved, and at the same time, the height of the rear carrier 20 is suppressed to the level of a normal bicycle. The rear carrier 20
The work of loading and unloading the luggage to and from the vehicle is facilitated, and the running stability and the stability at the time of stopping using the stand are improved.

FIGS. 6 to 8 show an electric assist drive bicycle according to a second embodiment of the present invention. The second embodiment of the present invention is different from the first embodiment in that the battery case receiving frames provided before and after the rear carrier are omitted, and the battery case is supported only by a steel plate slide rail in which the battery case is welded and fixed to the carrier. Thus, the position is fixed (the third embodiment of the present invention). Hereinafter, a second embodiment will be described with reference to the drawings. 6 is a plan view showing a state in which the battery unit 40 is attached to the rear carrier 20, FIG. 7 is a side view of the rear carrier 20 and the battery unit 40 in FIG. 6, and FIG. It is a line sectional view.

In the figure, the battery case of the battery unit 40 is configured by combining two cases, an upper battery case 41 and a lower battery case 42, as in the first embodiment. In the battery chamber R of the battery case, single type rechargeable dry batteries 33 are arranged in two horizontal rows with the axial direction being the longitudinal direction of the case, and only one of the rear ends is arranged at a right angle. The arrangement of the batteries 33 in the upper and lower battery cases 41 and 42 is the same as in the first embodiment. The upper and lower battery cases 41,
The slide rail 43 supporting the upper side 42 is the bar member 2
It is welded and fixed integrally to 0c and 20d. Moreover,
The slide rail 43 is engaged with a guide groove 41a provided on the protrusion of the upper battery case 41, and the upper and lower battery cases 41 and 42 are slidable in the longitudinal direction. Then, the bicycle 1 can be pulled out horizontally in the rear direction and pushed in.

The lock key 37 is similar to the first embodiment.
The upper and lower battery cases 41 and 42 are engaged with vertical grooves (not shown) provided in the upper battery case 41 to fix the upper and lower battery cases 41 and 42 to the rear carrier 20 and to prevent theft. Both the charging connector 38 and the power supply connector 39 are attached to the front end side surfaces of the upper and lower battery cases 41 and 42, respectively.

In the electric assist drive bicycle 1 according to the second embodiment of the present invention, similarly to the first embodiment, even if the luggage is placed on the rear luggage carrier 20, the load does not act on the battery unit 40. Since the outer dimensions of the battery unit 40 are smaller than the outer dimensions of the rear carrier 20, the battery unit 40 is protected by the rear carrier 20. Further, in the battery unit 40 of the present embodiment, the upper and lower battery cases 4 in which the batteries 33 are stored.
Although the weights 1 and 42 weigh about 4 kg, their weight is supported by a long steel plate slide rail 43 integrally welded and fixed to the steel bars 20 c and 20 d constituting the rear carrier 20. Of the upper and lower battery cases 41, 4 from the slide rail 43.
The attachment and detachment operation of 2 is easy and safe. further,
In the battery unit 40 of the present embodiment, similarly to the battery unit 30 of the first embodiment, the thickness is reduced, the appearance design is improved, and at the same time, the height of the rear carrier 20 is suppressed, and the work of loading and unloading luggage is easy. It has become.
Further, since the structure is simple and the number of parts is small, the cost can be reduced.

FIGS. 9 to 11 show an electrically assisted bicycle according to a third embodiment of the present invention. The difference between the battery unit 50 of the present embodiment and the battery unit 30 of the first embodiment is that two elongated battery cases each containing ten batteries 33 are inserted into battery case receiving frames provided before and after the battery unit. That is, the slide rail is omitted (the fourth embodiment). Hereinafter, a third embodiment will be described with reference to the drawings. 9 is a plan view showing a state in which the battery unit 50 is attached to the rear carrier 20, FIG. 10 is a side view of the rear carrier 20 and the battery unit 50 in FIG. 9, and FIG. It is a line sectional view.

In the figure, a front battery case receiving frame 51 and a rear battery case receiving frame 52 supporting left and right upper and lower battery cases 53 and 54 are attached to the lower front and rear ends of the rear loading platform 20, respectively. Have been.
The battery case of the battery unit 50 is configured by combining two cases, an upper battery case 53 and a lower battery case 54. The pair of upper and lower battery cases 53 and 54 are separately inserted into separate frame holes provided separately in the front and rear battery case receiving frames 51 and 52, respectively. The pair of upper and lower battery cases 53, 54
The rear end of the bicycle 1 has a handle 54 a for pulling out and pushing the battery case in the rear direction of the bicycle 1, and the front end has a power distribution connector 56 for connecting to a wiring in the front battery case receiving frame 51.

In the battery storage chambers R of the battery cases 53 and 54, ten single-type rechargeable dry batteries 33 are arranged in two horizontal rows with the axial direction being the longitudinal direction of the case. The front battery case receiving frame 51 incorporates internal wiring and terminals for the wiring, and a terminal plate for connecting an external wiring. The front battery case receiving frame 51 and the rear battery case receiving frame 52 are formed of steel bar members 20a, 20
b, mounting plate 2 integrally welded to 20c, 20d
It is screwed and fixed to 1, 23.

On the other hand, the lock key 55 is engaged with a vertical groove (not shown) provided in the pair of battery cases 53 and 54, and as in the first and second embodiments, these upper and lower battery cases 53, 54 are provided. 54 can be secured to the rear loading platform 20 and at the same time, theft can be prevented. The main body of the lock key 55 is welded and fixed to the steel bar member 20a of the rear carrier 20. The front battery case receiving frame 51 includes a charging connector 38 into which a DC current terminal of an external charger is inserted, and a power supply connector 39 into which a wiring terminal for supplying a current to the electric assist drive unit 10 of the bicycle is inserted. Both are attached together.

In the electric assist drive bicycle 1 according to the third embodiment of the present invention, as in the first and second embodiments, even if the luggage is placed on the rear luggage carrier 20, the load does not act on the battery unit 50. Since the outer dimensions of the battery unit 50 are smaller than the outer dimensions of the rear carrier 20, the battery unit 50 is protected by the rear carrier 20. Further, in the battery unit 50 of the present embodiment, the upper and lower battery cases 53 and 54 containing the batteries 33 (ten) weigh about 2 kg, but the weight thereof is the steel bar member 20 a constituting the rear carrier 20.
Mounting plate 21 and mounting plate 2 integrally welded and fixed to
Battery case receiving frame 5 before and after screwed and fixed to 3
1 and 52, the mounting structure has sufficient strength, and the upper and lower battery cases 53 and 54 can be easily attached and detached from the front and rear battery case receiving frames 51 and 52. Further, in the battery unit 50 of the present embodiment, the battery unit 30 of the first embodiment is used.
Similarly to the above, the thickness is reduced and the appearance design is improved, and at the same time, the height of the rear loading platform 20 is suppressed, so that the loading and unloading of the load can be easily performed. In addition, the structure is simple and low cost.

In the battery unit 50 according to the third embodiment, a pair of slide rails having an iron plate structure are provided on the upper surface of each battery case 53 so as to correspond to the protrusions. Member 20
The same operation as described above can also be achieved by integrally welding and fixing the battery case to the members c and 20d, supporting the battery cases 53 and 54 by the slide rails, and excluding the rear battery case receiving frame (the fifth embodiment). The effect is obtained.

FIGS. 12 to 14 show an electrically assisted bicycle according to a fourth embodiment of the present invention. In the fourth embodiment of the present invention, the two horizontal rows of batteries 33 are arranged in two vertical rows in one of the divided battery storage chambers in the above embodiment, and the thickness of the battery case is slightly increased, but the length is increased. It has a short and compact shape. The other configuration is similar to the configuration of the second embodiment, omitting the battery case receiving frames provided before and after the rear loading platform, and supporting only the steel plate slide rail which is fixed by welding the battery case to the rear loading platform. The position is fixed (Embodiment 6). Hereinafter, a fourth embodiment will be described with reference to the drawings. FIG. 12 is a plan view showing a state in which the battery unit 60 is attached to the rear carrier 20, and FIG.
3 is a side view of the rear carrier 20 and the battery unit 60 of FIG. 12, and FIG. 14 is a side view of FIG.

In the drawing, the battery case of the battery unit 60 is formed by combining two cases, an upper battery case 61 and a lower battery case 62, as in the first embodiment. These battery cases 6
The battery packs 1 and 62 are divided into left and right sides, and a battery storage chamber is provided therein. In each of the storage chambers, a single type rechargeable dry battery 33 is set up and arranged in two rows of five. I have. A slide rail 63 made of a steel plate that supports the upper and lower battery cases 61 and 62 on the upper side is integrally fixed to the steel bar members 20c and 20d by welding. In addition, the slide rail 63 is engaged with the guide groove 61a provided in the protrusion of the upper battery case 61, and the upper and lower battery cases 61 and 62 are slidable in the longitudinal direction. , The bicycle 1 can be pulled out horizontally and backward.

The lock key 37 is engaged with a vertical groove (not shown) provided in the upper battery case 61 to fix the upper and lower battery cases 61 and 62 to the rear loading platform 20 and stolen the same as in the above embodiments. It is provided for prevention. Both the charging connector 38 and the power supply connector 39 are attached to the front end side surfaces of the upper and lower battery cases 61 and 62, respectively.

In the electric assist drive bicycle 1 according to the fourth embodiment of the present invention, similarly to the above embodiments, even if the luggage is placed on the rear carrier 20, the load is reduced by the battery unit 6.
0, and since the outer dimensions of the battery unit 60 are smaller than the outer dimensions of the rear carrier 20, the battery unit 60 is protected by the rear carrier 20. Also, in the battery unit 60 of the present embodiment, the upper and lower battery cases 61 and 62 containing the battery 33 weigh about 4 kg, but the weight is integrated with the steel bar members 20 c and 20 d constituting the rear carrier 20. Is supported by a long steel plate slide rail 63 welded and fixed to the upper and lower battery cases 6 from the slide rail 63.
The attaching and detaching operations of the first and the 62 are easy and safe. Furthermore, in the battery unit 60 of the present embodiment, the thickness is slightly thicker than the battery units of the first to third embodiments, but the length is shorter, so that the external design is more compact. Moreover, the height of the rear loading platform 20 is 1st to 1st.
The height is kept at the same level as that of the battery unit of the third embodiment, and the work of loading and unloading the luggage is facilitated. In addition, since the structure is simple and the number of parts is small, the cost is low.

FIGS. 15 to 17 show an electrically assisted bicycle according to a fifth embodiment of the present invention. In the fifth embodiment of the present invention, two elongated battery cases accommodating ten batteries 33 are supported by respective unique slide rails fixed to the lower surface of the loading platform, and the front end side of the battery case is positioned at the lower surface of the loading platform. Each battery case is connected to a power distribution case provided in the front, and each battery case is arranged in a staggered arrangement of five batteries 33 in the battery housing room as in the fourth embodiment, and the thickness of the battery case is slightly increased. , And has a short and compact shape (the seventh embodiment). Hereinafter, a fifth embodiment will be described with reference to the drawings.
15 is a plan view showing a state in which the battery unit 70 is mounted on the rear carrier 20. FIG. 16 is a plan view of the rear carrier 20 shown in FIG.
FIG. 17 is a side view of the battery unit 70 and FIG.
It is an arrow side view.

In the figure, the battery case of the battery unit 70 is formed by combining two cases, an upper battery case 72 and a lower battery case 73, as in the first embodiment. In addition, the battery unit 70 includes two sets of the battery cases 72 and 73. In the battery storage chambers of the upper and lower battery cases 72 and 73, single-type rechargeable dry batteries 33 are erected and are arranged in two rows in a zigzag manner, five by five. The pair of upper and lower battery cases 72 and 73 are provided with handles 72b that allow the battery case to be pulled out horizontally from the lower side of the rear loading platform 20 of the bicycle 1 and pushed in.

On the upper surface of each upper battery case 72, a projection 72a having grooves on both sides is provided, and a pair of slide rails 74 having an iron plate structure are provided at the corresponding positions of the rear loading platform 20. 20 bar members 20c
And 20d are integrally welded and fixed. Therefore, the upper and lower battery cases 72 and 73 are
4 respectively.

On the other hand, the power distribution case 71 is
a, 20c are screwed and fixed to a mounting plate 25 which is integrally fixed by welding. Also, in the distribution case 71,
Wiring for current received from the power distribution connector 76 of the two battery cases 72 and 73 and terminals for connection to the charging connector 38 and the power supply connector 39 are provided.
Power distribution connector 76 of upper and lower battery cases 72 and 73
When the battery cases 72 and 73 are set, they are simultaneously inserted into the power distribution case 71 to energize. In addition, the charging connector 38 and the power supply connector 39 are attached to the power distribution case 71. The lock key 75 is engaged with a vertical groove (not shown) provided on the upper surface of the upper battery case 72 to fix the upper and lower battery cases 72 and 73 to the rear carrier 20 as in the above embodiments. It is provided to prevent theft. That is, when the rotation shaft 75a of the lock key 75 is turned, the latch 75b passes through the square hole 74a formed in the slide rail 74 and presses the rear end of the projection 72a of the upper battery case 72. By pulling out, the latch 75b is locked.

In the electric assist drive bicycle 1 according to the fifth embodiment of the present invention, similarly to the above embodiments, the rear loading platform 20 is provided.
, The load does not act on the battery unit 70, and since the outer dimensions of the battery unit 70 are smaller than the outer dimensions of the rear carrier 20,
The battery unit 70 is protected by the rear carrier 20. Further, in the battery unit 70 of the present embodiment, the upper and lower battery cases 7 in which the batteries 33 are stored.
The weights 2 and 73 are 2 kg each, but the weight is supported by a long steel plate slide rail 74 integrally welded and fixed to the steel bar members 20 c and 20 d constituting the rear carrier 20. Of the upper and lower battery cases 72, 7 from the slide rail 74.
The attachment / detachment operation of 3 is easy and safe. Further, in the battery unit 70 of the present embodiment, the thickness is slightly increased similarly to the battery unit 60 of the fourth embodiment.
The external design becomes compact because the length is shortened.
In addition, since the height of the rear carrier 20 is suppressed to the same height as that of the battery unit in other embodiments,
Loading and unloading of luggage is easy. Further, the structure is simple, the number of parts is small, and the cost is low.

FIGS. 18 to 21 show an electrically assisted bicycle according to a sixth embodiment of the present invention. The sixth embodiment of the present invention eliminates the front and rear battery case receiving frames below the rear carrier provided in the first embodiment, and replaces the steel plate slide rail welded and fixed to the rear carrier of the second embodiment. The horizontal girder bar of the rear carrier is turned downward so as to enclose the battery case, thereby guiding the battery case in the longitudinal and horizontal direction, attaching a guide rail for supporting the battery case, and fixing the position. And 9 embodiments). Hereinafter, a sixth embodiment will be described with reference to the drawings. 18 is a plan view showing a state in which the battery unit 80 is mounted on the rear carrier 81, FIG. 19 is a side view of the rear carrier 81 and the battery unit 80 in FIG. 18, and FIG. 21 is a rear sectional view of FIG.
It is a perspective view which shows a structure of.

In the figure, the battery case of the battery unit 80 is the same as the battery case of the second embodiment.
2 of the upper battery case 82 and the lower battery case 83
The two cases are combined. In the battery storage chamber R of the battery case, a single-type rechargeable dry battery 33 is disposed in a horizontal direction with the axial direction being the longitudinal direction of the case.
They are arranged in a row and only one of the rear ends is arranged at right angles.

Rear carrier 8 supporting battery unit 80
As shown in FIG. 21, the two components 1 are integrally welded at an interval to an outer frame bar 81 a serving as a normal rear cargo bed and a middle frame bar 81 b integrally welded thereto. The vertical members of the horizontal passing rods 81c and 81e are extended to the lower side of the loading platform, and the front ends thereof are bent inward to be opposed to each other, so that the lower central portion is removed to form a rectangular frame. An integrated bar material welding structure in which a horizontal U-shaped guide rail 81f that supports the battery case on the lower surface is welded to the end. Further, a laterally passing bar 81d is integrally welded to the outer frame bar 81a and the middle frame bar 81b of the rear loading platform 81,
The rear carrier 81 is supported on the rear wheel axle of the bicycle 1 via the support member 84. The guide rail 81f is formed so as to engage along both inner sides of a pair of parallel protrusions in the longitudinal direction of the lower battery case 83 to support the battery case and to slide in the longitudinal direction at the same time. , Bicycle 1 using battery case handle 83b
Can be pulled out horizontally and pushed back.

On the upper surface of the upper battery case 82, there is provided a projection 82b having a semicircular groove for engaging and positioning with the cross bar 81d of the loading platform when pushed into the mounting position of the battery case. , Upper battery case 82
A plurality of (two in the figure) projections 82a are provided on the end surface of the base member 81. The plurality of projections 82a (two in the figure) are formed on a plate 81g provided at the end of the guide rail 81f of the rear loading platform 81. ) Holes 81h to position the battery unit 80 here as well. Lock key 3 welded to rear carrier 81
7, the upper battery case 82 is engaged with a vertical groove (not shown) provided in the upper battery case 82 to fix the upper and lower battery cases 82 and 83 to the rear loading platform 81, as well as to prevent theft. It is provided to do so. Both the charging connector 38 and the power supply connector 39 are attached to the front end side surfaces of the upper and lower battery cases 82 and 83, respectively.

In the electric assist drive bicycle 1 according to the sixth embodiment of the present invention, similarly to the other embodiments described above, even if a load is placed on the rear loading platform 81, the load is reduced by the battery unit 8
0, and the outer dimensions of the battery unit 80 are smaller than the outer dimensions of the rear carrier 81, so that the battery unit 80 is protected by the rear carrier 81. When the battery 33 is inserted into the battery unit 80 of the present embodiment, the battery unit 80 weighs about 4 kg, but the weight thereof is the steel bar member 81 c constituting the rear carrier 81.
And 81e are supported by the guide rail 81f which is integrally welded and fixed, so that the strength of the mounting structure is sufficient, and the attachment / detachment operation of the battery unit 80 from the guide rail 81f is easy, and the side surfaces are also made of steel bars. Members 81c and 8
It is safer because it is surrounded by 1e. further,
In the battery unit 80 of the present embodiment, similarly to the battery units of the other embodiments, the thickness is reduced, the appearance design is improved, and at the same time, the height of the rear carrier 81 is suppressed, and the work of loading and unloading luggage is facilitated. Has become. Further, since the structure is simple and the number of parts is small, the cost can be reduced.

The embodiments of the present invention have been described above.
The present invention is not limited to the embodiments described above, and various modifications and changes can be made without departing from the spirit of the present invention.

[0038]

As described above, in the electric assist drive bicycle according to the present invention, the battery unit mounted on the rear loading platform is mounted on the lower surface of the rear loading platform while being divided into right and left parts while avoiding the rear wheels. The height of the loading platform can be suppressed to the level of a normal bicycle, the work of loading and unloading the luggage to the rear loading platform becomes easy, and the running stability and the stability at the time of stopping using the stand can be provided. Moreover, by arranging the batteries sideways, the battery case can be made thinner, and the appearance design can be improved. Since the outer dimensions of the battery unit are smaller than the dimensions of the carrier, an effect is obtained that the battery unit is protected by the carrier. In addition, since the battery case is attached to the lower side of the rear carrier, the load of the load does not act on the battery unit, and the electric assist drive bicycle of the present invention has high practicality when carrying the load. Further, the battery weighs about 4 kg, but when a handle is provided in addition to the guide for attachment and detachment, the attachment and detachment operation is easy and safe. Also,
In the case of the battery unit according to any one of claims 3, 6, and 7, which is supported only by a long steel plate slide rail integrally welded and fixed to a steel bar member constituting the rear carrier, the above-described effect is obtained. In addition to this, the structure is simple, the number of parts is small, and the cost can be reduced. Further, the battery case is supported by a U-shaped guide rail which is integrally welded and fixed to a steel bar member constituting the rear cargo bed and is welded to a steel bar member provided so as to surround the battery case. In the case of the battery unit according to the eighth and ninth aspects, in addition to having the above effects, the strength of the battery case support is stronger, the structure is simple, the number of parts is small, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a side view showing an electric assist bicycle to which a battery unit according to an embodiment of the present invention is attached.

FIG. 2 is a plan view showing a state where the battery unit according to the first embodiment of the present invention is mounted on a rear carrier.

FIG. 3 is a side view showing a rear carrier and a battery unit in FIG. 2;

FIG. 4 is a sectional view taken along line AA of FIG. 2;

FIG. 5 is a perspective view showing a rear carrier and a battery unit of FIG. 2;

FIG. 6 is a plan view showing a state where a battery unit according to a second embodiment of the present invention is mounted on a rear carrier.

FIG. 7 is a side view showing the rear carrier and the battery unit of FIG. 6;

8 is a cross-sectional view taken along the arrow B and line CC in FIG.

FIG. 9 is a plan view showing a state where a battery unit according to a third embodiment of the present invention is mounted on a rear carrier.

FIG. 10 is a side view showing the rear carrier and the battery unit of FIG. 9;

FIG. 11 is a cross-sectional view taken along a line D and a line EE in FIG. 9;

FIG. 12 is a plan view showing a state where a battery unit according to a fourth embodiment of the present invention is mounted on a rear carrier.

FIG. 13 is a side view showing the rear carrier and the battery unit of FIG. 12;

FIG. 14 is a side view as viewed in the direction of arrow F in FIG. 13;

FIG. 15 is a plan view showing a state where a battery unit according to a fifth embodiment of the present invention is mounted on a rear carrier.

FIG. 16 is a side view showing the rear carrier and the battery unit of FIG. 15;

FIG. 17 is a side view as viewed in the direction of the arrow G in FIG. 16;

FIG. 18 is a plan view showing a state where a battery unit according to a sixth embodiment of the present invention is mounted on a rear carrier.

FIG. 19 is a side view showing the rear carrier and the battery unit of FIG. 18;

FIG. 20 is a sectional view taken along the arrow H and line JJ of FIG. 18;

FIG. 21 is a perspective view showing the configuration of the rear cargo bed of FIG. 18;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Electric assist drive (with unit) bicycle 2 Frame 3 Pedal 10 Assist drive unit 17 Rear wheel 20 Rear carrier 30, 40, 50, 60, 70, 80 Battery unit 31, 41, 53, 61, 72, 82 Upper battery case 32, 42, 54, 62, 73, 83 Lower battery case 33 Battery 34, 51 Front battery case receiving frame 35, 52 Rear battery case receiving frame 36, 43, 63, 74 Slide rail 37, 55, 75 Lock key 38 Charging connector 39 Power supply connector 56, 76 Power distribution connector 71 Power distribution case 81 Rear carrier 81f Guide rail

Claims (9)

[Claims] In an electric assist drive bicycle in which an electric assist drive unit is added to a foot drive unit, a rechargeable battery unit for supplying electric power to the electric motor is provided with a two-sided rectangular parallelepiped battery storage at intervals. A battery case having a box, a single-type rechargeable dry battery horizontally placed in a storage box of each battery case, a power supply connector and a charge connector attached to a front end of the battery case, and A front battery case receiving frame and a rear battery case receiving frame that are attached to the front and rear ends to support the battery case, and are configured so as to be able to be mounted flat below the occupied surface of the rear carrier. An electric assist driven bicycle characterized by the following. A slide rail for supporting the battery case movably in the front-rear direction below the rear loading platform between a front battery case receiving frame and a rear battery case receiving frame of the battery unit; 2. The electric assisted driving bicycle according to claim 1, wherein the battery pack is a detachable type that can be horizontally pulled out, and a lock key is provided on the rear loading platform to both fix the position of the battery case and prevent theft. 3. The battery case slide rail according to claim 2, wherein the battery case slide rail is formed integrally with the rear loading platform so as to support the battery case and exclude a rear battery case receiving frame. Electric assist driven bicycle. 4. An electric assist drive bicycle in which an electric assist drive unit is added to a stepping drive unit, a chargeable battery unit for supplying electric power to the electric motor includes a pair of rectangular parallelepiped battery cases; A single-type rechargeable dry battery stored in a battery compartment, a power distribution connector attached to the front end of the battery case, and attached to the front and rear ends below the rear carrier, and the left and right battery cases are spaced apart. A front battery case receiving frame and a rear battery case receiving frame to be supported, a power supply connector and a charging connector attached to a front side of the front battery case receiving frame are provided, and the position of the battery case is fixed to the rear loading platform to prevent theft. An electric assist drive bicycle characterized by having a lock key that is also used. 5. In the battery unit, a pair of slide rails of an iron plate structure corresponding to each battery case are provided in parallel with the rear loading platform so as to support each battery case, and to provide a rear battery case receiving frame. 5. The structure according to claim 4, wherein the structure is excluded.
The electric assist driven bicycle according to 1. 6. A battery unit that supplies electric power to an electric motor in an electrically assisted bicycle in which an electric assist drive unit is provided in addition to a stepping drive unit, the battery unit is a two-sided rectangular parallelepiped battery storage with an interval. A battery case having a box, a single-type rechargeable dry battery that is vertically arranged in two rows in a storage box of each of the battery cases, a power supply connector and a charge connector attached to a front end of the battery case, and a rear portion. A front battery case receiving frame that is attached to a lower front end of the loading platform and supports the battery case, and is provided below the loading platform at a rear portion of the front battery case receiving frame so as to movably support the battery case in the front-rear direction. An iron plate structure and a slide rail integrated with the rear loading platform, and the rear loading platform serves to fix the position of the battery case and prevent theft. An electrically-assisted drive bicycle, comprising: a lock key to be used; an upper portion of a rear wheel being housed in a space between the battery cases on both sides; . 7. An electric assist drive bicycle in which an electric assist drive unit is provided in addition to a foot drive unit, a chargeable battery unit for supplying electric power to the electric motor includes a pair of rectangular parallelepiped battery cases, and a vertical battery unit provided in each of the battery cases. A single-type rechargeable dry battery stored in two rows, a power distribution connector attached to a front end of the battery case, and a connector engaged with the power distribution connector of the battery case; A battery case receiving frame that is attached to the front end of the side and supports the battery case on the left and right with an interval, and a pair of slide rails of an iron plate structure provided integrally with the rear carrier horizontally and parallel to each battery case, A power supply connector and a charge connector attached to the front side of the battery case receiving frame; An electric assist drive bicycle characterized in that a lock key is provided on the rear carrier to fix the position of the battery case and prevent theft. 8. A rechargeable battery unit that supplies electric power to an electric motor in an electric assist drive bicycle provided with an electric assist drive unit in addition to a foot drive unit and a rear carrier made of a steel bar. A rear loading platform in which the horizontal bar is extended downward to form a rectangular frame with the lower center part removed, and a U-shaped guide rail that is integrally mounted horizontally on the inner end of the rectangular frame in the bicycle traveling direction. A battery case having two rectangular parallelepiped battery storage boxes symmetrically spaced apart from each other, a single-type rechargeable dry battery stored horizontally in the storage box of each battery case, A power supply connector and a charging connector attached to the front end; and a lock key fixed to the rear carrier and used for fixing the position of the battery case and preventing theft. An electric assist drive bicycle characterized in that it can be mounted flat below the occupied surface of the rear carrier. 9. An electric assist drive bicycle having an electric assist drive unit provided on a stepping drive unit, wherein a projection having a semicircular groove engaging with a transverse bar of the rear carrier is provided on an upper surface of the battery case, The electric assisted bicycle according to claim 8, wherein the protrusion is configured to position the battery case on the rear carrier.