KR100287352B1 - Electric bicycle - Google Patents

Abstract

The battery is prevented from protruding in one direction by separating the battery into a shape surrounding the main frame instead of collecting the battery in only one direction of the main frame, thereby providing an electric bicycle having improved liftability. .

A battery case 10 including a driving unit for driving a wheel, a battery 12 for supplying power to the driving unit, and a battery case 10 housed in proximity to the saddle support pipe 2, which is a main frame, is prepared. 10) is formed in a shape having a concave portion 10c so that its cross-sectional shape can cover at least a portion of its outer circumference in the cross section of the saddle support pipe 2.

Description

Electric bicycle

The present invention relates to an electric bicycle that uses the power of an electric motor (motor) as an auxiliary means for driving a human, or uses the power of a motor as a driving force for driving. More particularly, the present invention can smoothly ride a vehicle in a stable state. The present invention relates to an electric bicycle having an improved shape of a battery case and an arrangement structure of a battery.

In a conventional electric bicycle, a driving motor is provided as an auxiliary means when a human travels, and a battery is installed in the bicycle as a driving power source of the motor.

As shown in FIG. 11, the mainframe of the motorcycle generally includes a head pipe 104 provided with a handle 105, a saddle support pipe 102 provided with a saddle 106, and the head pipe 104. ) And the main pipe (not shown hidden in the battery case 110 in FIG. 11) connected between the saddle support pipe 102 and the like.

In general, a structure in which a battery (cell) is loaded in a battery case and the battery case 110 is disposed on the main pipe as shown in FIG. 11 is generally known. The battery case 110 may be disposed in front of or behind the saddle support pipe 102 instead of being disposed on the main pipe.

In FIG. 11, reference numeral 101 denotes a drive unit incorporating an electric motor, a reduction mechanism, a torque sensor, and the like, and 119 denotes a frame cover covering a metal part installed as a main frame. 115 is a lid that covers the charging connector, which prevents the ingress of moisture and contaminants.

In the conventional electric motorcycle, as described above, the battery case is installed above or below the main pipe or in front of or behind the saddle support pipe. For this reason, for example, a battery is also structured in such a way that four batteries connected in series are connected in series in five rows side by side, and placed in the rear of the battery case.

However, when the diameter of the battery is about 33 mm and about three stages, the height is considerably high, so that the upper part of the main pipe and the front of the saddle support pipe protrude considerably, resulting in poor elevability.

In addition, since the chain case is installed before and after the saddle support pipe, if the battery case is placed on the chain case, the saddle must be made high and the foot is bad for people with small heights, which is very inconvenient.

On the other hand, if there is a structure in which the battery is placed next to the chain case in the part without the chain case, there is a problem that the battery is unbalanced, the stability is poor when riding, there is no integration of the battery arrangement and the wiring is complicated, which increases the cost.

In addition, the lid of the charging connector is made to prevent the ingress of rainwater and dust, but when such a lid is installed, it may get stuck and get in the way of riding, and the appearance may be bad.

In addition, the fixed part is made to move like a key to fix the battery, but the user can operate the fixed part by the key even when the battery is not installed. The battery may have run out.

The present invention is to solve such a problem, and the battery is prevented from protruding in one direction by separating and placing the battery in a shape surrounding the main frame, rather than integrated and arranged in only one direction of the main frame, the motorcycle To provide a single purpose.

Another object of the present invention is to improve the liftability by the circular structure or the narrow structure on the side (surface side) far from the main frame of the battery case.

It is still another object of the present invention to provide an electric bicycle that arranges a battery by making the surface side width of the battery case as narrow as possible.

Still another object of the present invention is to provide an electric bicycle capable of arranging a battery so that space efficiency is avoided when the battery case is made close to the saddle support pipe.

It is still another object of the present invention to provide an electric bicycle with a battery case which reduces the number of parts and looks stylish by omitting the lid covering the surface of the charger connector without exposing it to the outside.

Still another object of the present invention is to provide a safe electric motorcycle that can be securely fixed to the battery case.

1 is a side view showing an embodiment of an electric bicycle according to the present invention.

FIG. 2 is a cross-sectional view of the battery case and the saddle support pipe of the electric bicycle of FIG. 1.

3 is a longitudinal cross-sectional view of a battery case part of the electric bicycle of FIG. 1.

4 is a longitudinal cross-sectional view of the connector portion for charging in the electric bicycle of FIG.

5 is a cross-sectional view taken along the line A-A of FIG.

6 is a cross-sectional view showing a state fixed by the fixing means on the upper battery case.

FIG. 7 is a cross-sectional view taken along the line A-A of FIG. 6.

8 is a cross-sectional view illustrating a state in which the battery case is not fixed by the fixing means on the upper part of the battery case.

9 is a cross-sectional view taken along line B-B of FIG. 8.

10 is a cross-sectional view taken along line B-B of FIG. 6.

11 is a side view showing an example of a conventional electric bicycle.

* Description of the symbols for the main parts of the drawings *

1: drive unit 2: saddle support pipe

3: main pipe 10: battery case

10c: recess 12: battery

12a: first battery bag 12b: second battery bag

An electric motorcycle according to the present invention includes a driving unit for driving a wheel, a battery for supplying power to the driving unit, and a battery case installed in a mainframe in which the battery is loaded, and the battery case has a cross-sectional shape of the mainframe. It is formed in a shape having a concave portion so as to cover at least a part of the outer surface, and at least a part of the battery is loaded in the inner space on both sides sandwiching the concave portion.

The main frame means a main body of a body frame such as a head pipe provided with a handle constituting a bicycle, a saddle support pipe (seat tube) provided with a saddle, and a main pipe (down tube) connecting a head pipe and a saddle support pipe. .

In order to achieve the structure described above, when the battery case has a compact shape without protruding in one direction of the main frame, the liftability is considerably improved.

The cross-sectional shape of the battery case covering the main frame is such that the outer frame facing the concave portion has a round bow shape or the width of the portion including the center portion is narrower than the outer width of the concave portion. The surface width of the portion protruding from the surface is narrowed, and the lifting performance is considerably improved.

A plurality of batteries loaded in the battery case is preferably formed of a battery assembly. In other words, the battery assembly includes a first battery bag in which n batteries (n is an integer of 2 or more) arranged in a vertical column and packed in a serial connection state, and a plurality of n batteries arranged in a plurality of columns in a serial connection state. It is packed with a second battery bag.

Preferably, the battery case has a convex portion formed to face the concave portion, and the battery case has a first battery bag loaded in the inner space of the convex portion and two second battery bags at the concave portion. It is loaded in the state where the space | interval of each other narrowed toward the direction of a 1st battery bag in the inner space of the both sides which inserted.

Thus, since two of said 2nd battery bags are loaded so that the space | interval can become narrow on the said 1st battery bag side, since the width is easy to form in circular arc shape or narrow width on the surface side away from the main frame, it is preferable.

More preferred of the electric motorcycle according to the present invention is that the mainframe has a saddle support pipe extending obliquely downward from the saddle and a main pipe extending obliquely upwardly connected to the saddle support pipe, and the saddle support pipe and the main frame The chain case extends from the pipe connection to the rear wheel, and the base is then prepared to install the battery case on the saddle pipe by placing the bottom of the battery case at the same time as the connection. It has a narrow section formed by making the left and right width narrower than the upper cylinder of the same cylinder so as not to interfere with the case, and the output terminal for battery is installed at the narrower portion of the same cylinder, and the upper side of the chain case is installed in the upper cylinder of the same cylinder. In the inner space of the wide part, saddle wave The battery is loaded so as to be almost symmetrical with respect to the center plane where the center line of the if and the center line of the main pipe can be combined.

This configuration makes the battery almost symmetrical with respect to its center plane and improves safety. In addition, other electronic components such as an output terminal and a connector can be arranged well beside the chain case, and the height of the battery case can be lowered from the lower side of the bicycle.

More preferred of the electric bicycle according to the present invention is that the battery is rechargeable and the battery case is installed in the mainframe in such a way that the connector part is placed toward the mainframe to charge the battery, and the connector part thereof can be covered by the mainframe. .

In order to achieve such a structure, the charging connector part is enclosed from the mainframe, so it is easy to prevent infiltration of moisture and intrusion of dust, and the lid is unnecessary, thereby reducing the parts.

It is preferable that the elastic sheet is inserted into the contact surface of the battery case and the main frame to securely fix the battery case and prevent hardness.

When the battery case is installed in close proximity to the saddle support pipe of the mainframe, the elastic sheet is inserted between the battery case and the saddle support pipe at the top of the charging connector portion from above the saddle support pipe. It is also preferable for blocking rain water to be delivered.

In order to cover the connector part for the electric charging, the battery case may further protect the charging connector part from rainwater if the part is bent toward the main frame.

Specifically, it is preferable that the battery case is formed in a U-shape in a cross-sectional shape and installed to cover the main frame, and the charging connector portion is installed at a lower portion of the U-shape.

More preferred of the electric bicycle according to the present invention is provided with an installation detecting means for detecting that the battery case is installed in a predetermined cylinder of the main frame and a fixing means for fixing the battery case to the main frame, the installation detecting means is a battery Only when it is detected that the case is installed in the mainframe is configured so that the battery case can be fixed to the mainframe by the fixing means.

In other words, the detection means does not detect the mounting of the battery case until the battery case is securely mounted on the main frame, so that the mounting of the battery case by the fixing means becomes impossible. When the battery case is securely mounted to the main frame, the battery case can be mounted by the fixing means.

As an example of the detection means, the battery case has an elastic body that applies a force in a non-mounting direction (a direction different from the direction in which the main frame is installed in the main frame). It is further preferable that the elastic body has an elastic body stronger than the weight of the battery case.

In this case, the fixing means does not operate only by placing the battery case on the main frame, but the fixing means operates only when the user presses the battery case to shrink the elastic body in the mounting direction.

In addition, the fixing means serves to lock and release the battery case to the mainframe and serve as a key connected to the power switch, and the power switch is turned on when the battery case is fixed to the mainframe by the key.

In this case, if the installation of the battery case is uncertain, the power is not secured to the power circuit and the battery case is securely connected to the power supply only when it is fixed to the mainframe correctly.

And the battery case is installed so as to contact the saddle support pipe of the main frame including at least the front wheel side outer surface, the fixing means is installed on the rear wheel side of the saddle support pipe and also to secure the upper end of the battery case to be released from the saddle support pipe. Play the key.

In such a configuration, the battery case can be firmly fixed by relying on the saddle support pipe without disturbing the riding.

Hereinafter, the electric bicycle of the present invention will be described with reference to the drawings.

As shown in the side view of the embodiment in FIG. 1, the electric motorcycle of the present invention includes a drive unit 1 for driving a wheel, a battery for supplying power to the drive unit 1, and a saddle support pipe which is a part of a main frame to accommodate the battery. (2) having a battery case 10 installed close to the battery case 10 is a cross-sectional view of the saddle support pipe (2) at least part of its outer periphery (outer surface) in the cross-sectional shape as shown in FIG. As shown, the shape has a concave portion 10c.

As shown in FIG. 2, the battery case 10 is formed in a U-shape by forming a concave portion 10c such that it covers the horizontal side from the front wheel side of the saddle support pipe 2 in a cross-sectional shape as shown in FIG. 2. In other words, the battery case is installed not only disposed in front or rear of the saddle support pipe 2 but also in the horizontal direction of the saddle support pipe 2.

Next, in the example shown in Fig. 2, the front surface side thereof is formed to be a narrow width E from the width D on the side of the saddle support pipe 2. The battery case 10 is formed of a lower case 18a and an upper case 18b formed from plastic molding or the like, and is formed as one case by fitting into a hooked shape 18c.

In the battery case 10, as shown in FIG. 3, a first battery bag 12a having four batteries 12 arranged vertically and connected in series as one package (bag) as shown in FIG. And a battery assembly composed of a second battery bag 12b having a bundle of four connected in series as one bag.

As shown in FIG. 2, the first bag 12a is a convex portion formed to face the front side of the saddle support pipe 2, that is, the concave portion 10c. 12b) is loaded toward the first bag direction from the inner space on both sides in which the saddle support pipe 2 is inserted, i.e., the inside 10c.

These batteries 12 are all connected in series. In the example shown in Fig. 2, two sets of second bags 12b, which are installed in the inner spaces on both sides into which the saddle support pipe 2 is inserted, have a narrower gap, that is, a cross-sectional shape toward the first bags 12a. It is loaded in octagonal shape. The hooked shape 18c fitted to the lower case 18a and the upper case 18b mentioned above is formed in the position of the center point in the side surface of this 2nd bag 12b.

A convex portion 10a is provided below the battery case 10. The convex portion 10a was inserted into the insertion hole 20a of the pedestal 20 fixed to the junction between the saddle support pipe 2 and the main pipe 3 by welding or the like.

Then, the lower end of the battery case 10 is formed narrowly (see FIG. 3F) to avoid the chain case 7, and is widely formed on the upper end of the chain case 10 (see FIG. 3G). The above-described battery 12 is loaded to be almost symmetrical with respect to the center plane (surface connecting the centerline of the saddle support pipe 2 and the centerline of the main pipe 3) to the widely formed portion. In the narrowly formed portion, electrical components such as the charging connector 11, the fuse 13, and the output terminal 14 are disposed, and the wide upper portion is effectively used as a dedicated space of the battery 12. The battery 12 can be arranged.

As the convex part 10a is inserted into the insertion hole of the pedestal 20, the battery case 10 having the structure as described above is fixed to the saddle support pipe 2 and the upper part of the battery case 10 is fixed to the saddle. As a key provided in the support pipe 2, the output of the battery from the metal part 33 of the key box 30 is moved in accordance with the rotation of the switch key, thereby being firmly tightened.

In addition, the output terminal of the battery case 10 is to be connected to the connection pin of the terminal block 22 provided on the pedestal 20 by placing the battery case 10 on the pedestal 20.

An elastic sheet 17 is attached to the inside of the concave portion 10c of the battery case 10, and is firmly fixed so as not to have hardness between the sheet pipe 2. The periphery of the pedestal 20 is covered with a frame cover 28 to protect the pedestal portion as well as to maintain the appearance of the outer shell.

In addition, other structures such as front wheels, rear wheels, handles, saddles, pedals and chains, and functions such as brakes are the same as those of ordinary bicycles, and thus description thereof will be omitted. In the above example, the battery case 10 is formed so as to cover the saddle support pipe 2 from the front of the saddle support pipe 2 to the transverse side thereof, but the installation of the battery case 10 is applied to another main frame such as a main pipe. It looks the same when installed close.

Further, the central portion on the surface side facing the concave portion away from the main frame of the battery case 10 may be formed in a continuous arc shape from the horizontal side without being formed into a narrow protrusion in the cross-sectional shape.

As described above, the structure of the battery case 10 of the electric motorcycle of the present invention is formed as if the recessed portion 10c is formed to cover the main frame with the recessed portion 10c.

For this reason, the thickness or height of the battery case protruding forward or upward from the mainframe is reduced compared to the prior art, so that the battery case is not disturbed when boarding a motorcycle.

On the other hand, in the saddle support pipe 2 and the main pipe, even if the battery case 10 is wider in the horizontal direction, the left and right widths thereof are narrower than the distance between the pedals. It does not get in the way and it becomes a very comfortable electric motorcycle.

Further, when the concave portion (the top of the surface side with respect to the concave portion) of the battery case 10 is formed in the shape of an arc or a narrow width in the cross-sectional shape, the elevability is further improved.

Although the multiple batteries 12 loaded in the battery case 10 having the above-described structure cannot be collected in a single bundle and loaded, the battery 12 is divided into one and two hundred bags, and the two hundred bags are concave 10c. The width of the front or upper portion of the battery case 10 can be made smaller from the horizontal width of the basic structure than the respective spaces in the inner spaces of both sides) and the one hundred bags in the convex portions facing the concave portions.

In this way, the shoulder portion of the battery case 10 is not angular and can be formed in a smooth arc line (refer to R of FIG. 2).

In other words, when two battery packs are loaded so as to be parallel to each other, the shoulder portion of the battery pack is protruded and the width of the battery case at the front or upper portion is wider, but the battery pack is loaded at an angle as described above. The width of the front or upper part of (10) can be narrowed.

Next, since the two rows of bags installed on both sides become narrow and obliquely arranged at the front or the upper part, the portions of the battery case 10 divided into two parts are designed to have two rows of bags horizontally, and have a hook shape (18c). Because it fits in, space can be secured. As a result, the battery case 10 can be formed compactly or narrow in front of it.

The rear part or the lower part of the battery case 10 may be narrowly formed thereon, so that the battery 12 may be separated from the chain case 7, and further, the electrical parts such as the output terminal and the connector are installed in the narrowly formed part of the battery case 10. The wide part of the upper part of the chain case 7 can be arranged substantially symmetrically with respect to the center plane, and becomes compact, resulting in a stable battery case 10.

In the electric bicycle of the present invention, the charging connector 11 for charging the rechargeable battery 12 is installed toward the saddle support pipe 2 of the battery case 10 as shown in FIG. As shown in the cross-sectional view taken along line AA of FIG. 4, the battery case 10 is installed such that the charging connector 11 is covered by the saddle support pipe 2.

A lower portion of the battery case 10 is provided with a convex portion 10a, which fits into an insertion hole portion installed in the pedestal 20 and prevents the plate from falling down in front of the tongue 21 of the pedestal 20. It is fixed to be possible.

In addition, this example has a structure in which the output terminal 14 and the connecting pin 23 provided on the pedestal 20 are in contact with each other, and the output of the battery comes out only by placing it on the pedestal 20.

In addition, the upper end portion of the battery case 10 is fixed by pulling toward the saddle support pipe 2 from the key box 30 as shown in FIG. Therefore, the lock is released by the key box 30, but the upper part of the battery case 10 can be easily removed by tilting the upper part upward while pulling it upwards. 20) If the convex part 10a of the lower part of the battery case 10 is inserted into the insertion hole of the pedestal 20, the upper part is dropped to the saddle support pipe 2, and then the key box ( 30) can be fixed simply.

In the present invention, the charging connector 11 is provided at the center of the battery case 10 in contact with the saddle support pipe 2 in the direction of the lower portion of the battery case 10. The charging connector 11 can be charged to the rechargeable battery using, for example, a plug designed for a charger (not shown). However, in the present invention, the charging connector 11 is designed toward the saddle support pipe 2. As long as the battery case 10 is mounted on the mainframe, the battery case 10 cannot be charged, and when the battery case 10 is charged, the battery case 10 is removed and charged using the plug of the charger.

On the other hand, since the open portion of the charging connector 11 is closed from the saddle support pipe 2, it is not visible from the outside and directly connected to the saddle support pipe 2 without a lid.

In this example, an elastic sheet 17 is provided between the battery case 10 and the saddle support pipe 2. The elastic sheet 17 is made of, for example, foamed urethane foam, and thus, it is preferable to install the elastic sheet 17 because the fixing between the two sheets can be secured and the hardness can be prevented.

In the example shown in Figs. 4 to 5, the elastic sheet 17 is installed above the connector 11, but if it is installed in the upper direction, even if it is fixed to the battery case 10, it is not at all suitable for charging. It does not occur

And even if rainwater comes down from the top to prevent intrusion into the connector (11).

However, if it is fixed to the saddle support pipe (2) side can insert the elastic sheet 17 in the middle of the connector (11) also can prevent the hardness and prevent the ingress of moisture.

As shown in FIG. 6, the upper end of the battery case 10 of the electric bicycle according to the present invention has a structure fixed by a fixing part (fastener 33) of the key box 30 installed in the saddle support pipe 2. .

The key box 30 is fastened to the key station 32 obtained by the rotation of the key 31 as shown in FIG.

A part of the outer surface of the fastener 33 is formed with a circular arc-shaped fastening portion 33a, and is formed in a cloud shape coupled to the outer surface of the cylindrical body or the cylindrical body by rotation, the outer surface installed in the battery case 10 It is cloud-coupled with this circular rolling part (Roll 15) (see Figure 5).

The fastener 33 has a structure in which a magnet 35 is installed and is close to a reed switch (not shown) mounted on a substrate (not shown) installed by the board mounting frame 37 and the reed switch is turned on. .

That is, when the fastening portion 33a of the fastener 33 is cloud-engaged with the roller of the battery case 10 by rotating the predetermined amount (first stage) of the key 31 to fix the battery case 10 and rotated to the first stage. The magnet 35 is close to the reed switch while maintaining the rolling state, and the power is turned on.

On the outer surface opposite to the fastening portion 33a of the fastener 33, a concave and convex portion 33b is formed as shown in Figs. 6 and 8, and a spring piece is formed as an elastic body shaped to fit into the concave portion. (43), the creek is sent by the rotation of the key (31) and rotates every step.

The spring piece 43 is attached to the key stay 42 with a screw. A hook portion 33c is formed next to the concave and convex portion 33b, and when the battery case 10 is released, the hook portion 33c is a protrusion 44a of the stopper pin 44. As shown in FIG. The rotation of the key 31 is prevented.

Since the stopper pin 44 is installed in the key stay 42 by inserting the spring 45 as shown in FIG. 7, the protruding portion 44a has a hook shape 33c by pressing the stopper pin 44 in the S direction. ), The key 31 can be rotated in the release direction.

That is, the key 31 is inadvertently rotated in the release direction so that the battery case 10 is not dropped, and when the battery case 10 is removed, the key 31 is rotated while pressing the stopper pin 44. (10) is to be separated.

The hook portion 33c is formed in a torsional shape and has a structure in which the rotation of the key 31 in the reverse direction, that is, when the battery case 10 is mounted, can be rotated without pressing the stopper pin 44. .

At the tip of the stopper pin 44 in the S direction, the pressing part 50, which is a detection means for the resin product, is provided to contact. The pressurized part 50 comes into contact with the restricting part 50a connected to the stopper pin 44 and the convex part 10c, which is a sensing part formed in the battery case 10, and is pressed by mounting of the battery case 10. It is formed along the contact part 50b.

In addition, the pressing part 50 is provided with a spring 51 which is an elastic body because the force is applied to the battery case 10 in a direction opposite to the mounting of the battery case 10.

When the battery case 10 is not mounted, the pressing part 50 is pressed toward the battery case 10 according to the force of the spring 51 as shown in FIG. 9, so that the restricting portion 50a and the stopper pin are not. 44 is in contact, and this stopper pin 44 cannot be pressed by a user.

In addition, as shown in FIG. 10, when the battery case 10 is in a mounted state, the pressing part 50 is pressed along the convex portion 10c of the battery case 10, and the stopper pin 44 and the restricting portion ( The contact with 50a) is released, and the stopper pin 44 can be operated.

The force of the spring 51 for applying the force to the pressing part 50 is set so as not to decrease just by loading the battery case 10, so that the pressing part 50 is not moved unless the user presses forcefully. .

6 and 8, the key box 30 is fixed to the saddle support pipe 2 in the installation tool 41. As shown in FIG. As shown in FIG. 7, a key stay 42 for fixing the stopper pin 44 and the spring 45 is fixed to the mounting hole 41, as shown in FIG. 7. ) Is fixed.

In this mounting hole 41, a tongue-shaped metal piece 41a is provided, and is located above the projection 10b of the roll portion of the battery case 10. As a result, the battery case 10 is prevented from falling upward even in the up and down vibration. Of course, the bottom of the battery case 10 is held by the pedestal 20.

In addition, other front wheels, rear wheels, steering wheels, saddles, pedals, chains, and other structures and functions such as brakes are the same as those of ordinary bicycles, and thus description thereof will be omitted. In addition, in the above-described example, the battery case is installed in the saddle support pipe, but the case is installed in the other mainframe, such as the main pipe, the case is installed in the longitudinal direction or inclined direction is the same shape.

Next, attachment and detachment of the battery case 10 and operation of a switch by operating the key 31 of the key box 30 will be described with reference to FIGS. 6, 10, 8, and 9.

As shown in FIGS. 8 and 9, when the fastening portion 33a of the fastener 33 is not cloud-coupled from the roll portion of the battery case 10, the upper part of the battery case 10 is not fixed and the battery case ( The upper part of 10) may be pulled out to remove the battery case 10.

In addition, in order to change the battery case 10 from the fixed state to the released state, as described above, the stopper pin 44 cannot be released unless the stopper pin 44 is pressed.

On the other hand, the charged battery case 10 is placed on the pedestal 20 so that the convex portion 10a enters the insertion hole 20a of the pedestal 20, and the upper part is brought into close contact with the saddle support pipe 2 so as to provide a key. Rotating the 31 and the fastening portion 33a of the fastener 33 is cloud-coupled to the roll 15 of the battery case 10, the battery case 10 by rotating the fastener 33 in the state of FIG. The upper part of the) is fixed so that the switch is turned on. And when the fastener 33 is rotated by rotating the key 31, the switch is turned off.

Moreover, the case where the battery case 10 is attached is demonstrated.

When the battery case 10 is removed for charging, the position of the key 31 is turned to the right as shown in FIG. In this case, as shown in FIG. 9, the stopper pin 44 and the regulating portion 50a of the pressing part 50 are in contact with each other so that the stopper pin 44 is not pressed.

When the battery case 10 is mounted, the user presses the battery case 10 so as to be reflected by the force of the spring 51, and the pressing part 50 is pressed upward by pressing the convex portion 10c of the contact portion 50b. Since the contact portion between the restricting portion 50a and the stopper pin 44 is lost, the user can press the stopper pin 44. If the battery case 10 is not securely mounted in this way, the key 31 cannot be turned, that is, no power is supplied from the battery.

According to the present invention, a compact battery case which does not protrude in one direction of the main frame is made, and an electric bicycle is made which does not interfere when the pedal is pressed and when the ascends the bicycle. In addition, since the battery is disposed symmetrically with respect to the center plane of the bicycle, the stability is also very safe and light electric motorcycle.

Claims (12)

A drive unit for driving a wheel, a battery for supplying power to the drive unit, and a battery case loaded with the battery and installed in the main frame, the battery case having a cross-sectional shape at least partially covering the outer surface of the main frame; And an at least part of the battery being loaded in the inner spaces on both sides of the recess, the recess being formed. The battery case of claim 1, wherein the battery case is formed of a plurality of batteries, the first battery bag having the battery assemblies arranged vertically, and the two second batteries having the plurality of batteries arranged vertically. The battery case is provided with a convex portion formed to face the concave portion facing the concave portion, wherein the first battery bag is loaded into the inner space of the convex portion, and the two second battery bags are concave. An electric bicycle that is loaded in a state where the gap between each other is narrowed toward the first battery bag in the inner space of both sides inserted in the portion. 2. The saddle restraint pipe of claim 1, wherein the mainframe has a saddle restraint pipe extending obliquely downwardly from the saddle and a main pipe extending obliquely upwardly so as to contact the saddle rest pipe. And a chain case extending from the contact portion to the rear wheel side, and a stand for installing the battery case on the saddle support pipe to be installed at the contact portion so that the bottom of the battery case can be placed thereon. The left and right widths are formed to be narrower than the upper side of the lower side so as not to interfere with the chain case, and the output terminal for battery is installed at the narrow side of the lower side, and the wider portion extending above the chain case at the upper side of the lower side. And the saddle support pie in this broad space Electric motorcycle in which the battery is loaded so as to be substantially symmetrical with respect to the central surface capable of binding to a center line and the center line of the main pipe. The electric bicycle according to claim 1, wherein the battery is rechargeable and the battery case is installed in the mainframe with the connector part on the mainframe side for charging the battery and the connector part covered by the mainframe. The electric bicycle according to claim 4, wherein the battery case is installed in contact with the mainframe and the elastic sheet is inserted into both contact surfaces. 6. The electric motorcycle according to claim 5, wherein the battery case is installed in the saddle support pipe of the mainframe and the elastic sheet is inserted into the contact surface of the battery case and the saddle support pipe in an upward direction of the connector portion of the battery case. The electric bicycle according to claim 4, wherein the side portion of the battery case is formed in a shape covering the outer surface side of the main frame. 8. The electric motorcycle according to claim 7, wherein the battery case has a substantially U-shaped cross-sectional shape and a connector portion is provided at a lower portion of the U-shaped portion. 2. The apparatus according to claim 1, further comprising installation detecting means for detecting that the battery case is installed at a predetermined position of the main frame, and fixing means for fixing the battery case to the main frame, wherein the installation detecting means is a main frame of the battery case. An electric bicycle that is configured to be fixed to a main frame of a battery case by a fixing means only when the installation is detected. 10. The electric motorcycle according to claim 9, wherein the installation detecting means is provided with an elastic body that is applied in a direction that resists the installation on the main frame of the battery case. 10. The method of claim 9, wherein the fixing means serves to lock and release the main frame of the battery case and at the same time acts as a key interlocked with the power switch, when the battery case is fixed to the main frame by the fixing means. Electric motorcycle to be turned on. 10. The battery case according to claim 9, wherein the saddle support pipe of the mainframe is installed in the vicinity of at least the front wheel side outer surface and the fixing means is installed on the rear wheel side of the saddle support pipe. Electric bike set on the releasably.