JPH10138975A - Motor-assisted bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make matching accuracy of a cover member to a vehicle body frame into high accuracy by fixing rear parts of an upper cover and both side covers to a battery case, locking the front ends on each other, and holding a down tube in a state where the front ends of three cover members are combined with one another. SOLUTION: In a cover 21, the rear part of an upper cover 35 and rear parts of two side covers 36 are connected to one battery case 15, the rear parts are assembled to a vehicle body frame by being taken as the reference of assembling position, a down tube 4 is held and positioned along it. The rear part of an under cover 38 is fixed to a power unit 3, and the front part is fitted to the front part of the power unit 13. The front part of the side cover 36 is fixed to the front part of the under cover 38, and the front part of the under cover 38 is fitted to the front part of the power unit 13. Therefore, matching accuracy of not only the mutual cover members but also the cover member to the vehicle body frame can be made into high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric bicycle provided with a motor for generating driving force, and more particularly to a cover mounting structure for covering a power unit having a motor.

[0002]

2. Description of the Related Art As an electric bicycle of this type, there is one in which a power unit having a motor is disposed below a down tube of a body frame. In this electric bicycle, the power unit and bolts for fixing the power unit to the body frame are covered with a cover so as not to be exposed.

[0003] The cover is formed so as to be divided in the vertical direction, and the respective cover members are separately fixed to the vehicle body frame by bolts in a state where they are combined.

[0004]

However, in the cover mounting structure constructed as described above, the alignment of the cover members is easily affected by the frame accuracy, and the manufacturing error of the body frame causes the joint portions of the cover members to overlap. There is a problem that a gap is formed in the cover member and a gap between the cover member and the vehicle body frame is not as designed.
Further, there is a problem that the number of bolts for fixing each cover member is large, and the assembling work is complicated.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and it is an object of the present invention to improve the accuracy of aligning the cover members, reduce the number of fixing bolts, and improve the assemblability of the cover. Aim.

[0006]

An electric bicycle according to the present invention has a power unit fixed below a portion where a seat tube is connected to a down tube in a body frame,
The battery case is fixed to the body frame above the power unit, the power unit, the battery case, the lower part of the down tube and the lower part of the seat tube are covered by an upper cover that covers the upper part of the power unit, and a pair of left and right sides extending downward from the side of the upper cover. The cover is covered with an undercover connected to the lower ends of these side covers, the rear portions of the upper cover and both side covers are fixed to the battery case, and the front ends are connected to each other via a locking structure. In this structure, the front ends of the cover members are held together to hold the down tube.

According to the present invention, since the rear portion of the upper cover and the rear portions of the two side covers are fixed to one battery case, these cover members are assembled to the vehicle body frame using the rear portions as a reference for the assembly position. On the other hand, since the front ends of these cover members only hold the down tube, they are positioned along the down tube. For this reason, the cover members can be made highly accurate without being affected by the frame accuracy, and the alignment accuracy between the cover member and the body frame can be made high.

[0008] An electric bicycle according to another invention is the electric bicycle according to the above-described invention, wherein a rear portion of the undercover is fixed to the power unit, and a front portion is fitted with a front portion of the power unit. The front part of the side cover is fixed to the part.

According to the present invention, the front portion of the undercover is fitted with the front portion of the power unit, so that the positional accuracy is improved and the fitting error can be absorbed by the fitting portion. To fix
Assembly error can be absorbed by elastic deformation.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an electric bicycle according to the present invention will be described in detail with reference to FIGS. FIG. 1 is a side view of an electric bicycle according to the present invention, FIG. 2 is an enlarged side view showing a power unit mounting portion, and FIG. 3 is an enlarged side view showing a battery box mounting portion, and FIG. Is broken away. 4A and 4B are diagrams showing a battery box case, wherein FIG. 4A is a plan view, FIG. 4B is a cross-sectional view taken along line IV-IV in FIG.
Is a rear view.

FIG. 5 is a sectional view taken along line VV in FIG. 2, FIG. 6 is a sectional view taken along line VI-VI in FIG. 2, FIG. 7 is a view showing a lock for the battery box, and FIG. FIG.
Is a side view. 8 is a sectional view taken along line VIII-VIII in FIG. 3, FIG. 9 is a rear view of the battery box guide, and FIG.
Is a side view showing a state in which the cover is assembled, and FIG.
, FIG. 12 is a view from arrow B in FIG. 10,
FIGS. 13A and 13B show the upper cover. FIG. 13A is a plan view and FIG. 13B is a side view.

FIG. 14 is a side view of the side cover. FIG. 14A shows the left side cover, and FIG. 14B shows the right side cover. 15A and 15B are side views of the under cover. FIG. 15A is a left side view, and FIG. 15B is a right side view. FIGS. 16A and 16B are views showing the undercover, wherein FIG. 16A is a plan view, FIG. 16B is a front view, and FIG. 16C is a rear view.
FIG. 17 is a sectional view taken along line XVII-XVII in FIG.

FIG. 18 is a cross-sectional view showing a joint portion between the front portion of the upper cover and the front portion of the side cover, and FIG.
XVIII-XVIII sectional view of the right side of the vehicle body in FIG.
FIG. 3 is a sectional view taken along line BB in FIG. 3A, and FIG. 3C is a sectional view taken along line CC in FIG. 3A. 19 is a sectional view taken along line XIX-XIX in FIG. 10, FIG. 20 is a sectional view taken along line XX-XX in FIG. 10, and FIG. 21 is a sectional view taken along XXI-XXI in FIG.
It is a line sectional view.

FIG. 22 is a sectional view taken along the line CC in FIG.
23 is a sectional view taken along line DD in FIG. 10, and FIG.
0 is a sectional view taken along the line EE in FIG.
FIG. 26 is a sectional view taken along line GG in FIG. 10. FIG. 27 is a perspective view showing a coupling structure of the front part of the cover,
FIG. 28 is an exploded perspective view of the cover.

In these figures, reference numeral 1 denotes an electric bicycle according to this embodiment. A body frame 2 of the electric bicycle 1 includes a head pipe 3 and a down tube 4.
, A seat tube 5, a seat stay 6, a chain stay 7, and the like. The head pipe 3
, Rotatably supports a front fork 10 having a front wheel 8 and a steering handle 9, and the seat stay 6 and the chain stay 7 support a rear wheel 11.

As shown in FIG. 2, the rear part of the down tube 4 is formed so that the inclination angle is gentler than the front part. This gentle slope is indicated by reference numeral 4a. The lower end of the seat tube 5 is welded to the rear end of the inclined portion 4a. A power unit bracket 12 is welded to the inclined portion 4a and the lower end of the seat tube 5, and the power unit 1 is
3 is installed. The chain stay 7 is connected to the down tube 4 and the seat tube 5 via the bracket 12. In addition, the bracket 1
2 also attaches a synthetic resin battery case 15 for mounting a vertically removable battery box indicated by reference numeral 14 in FIGS. 1 and 3.

The power unit 13 has a pedaling force indicated by reference numeral 16 in FIG.
The auxiliary power from the motor 7 is combined with a resultant force mechanism (not shown) in the housing 18, and is fixed to the front end and the rear end of the bracket 12 by mounting bolts 19 and 20. The resultant force is the power unit 1
3 is transmitted to a rear wheel 11 via a chain 13a from a drive sprocket (not shown) provided on the right side of the vehicle body. The power unit 13 is provided with a crankshaft 13.
Except for the portion through which b penetrates, it is covered by a cover 21 described later. Further, in the power unit 13, a controller for controlling the motor 17 is attached to the rear end. This controller is indicated by reference numeral 13c in the figure. As shown in FIG. 2, the controller 13c is covered by an undercover of a cover 21 described later and the bracket 12.

As shown in FIGS. 2 to 4, the battery case 15 is formed in a rectangular shape with a bottom so that a box-shaped battery box 14 can be fitted from above. 15a and a connecting plate 15b protrudes from the front part on the left side of the vehicle body. The connection plate 15
a is fixed to the bracket 12 by bolts 22 as shown in FIG. 5, and the connecting plate 15b is fixed to the bracket 12 by bolts 23 as shown in FIG. The front connection plate 15b is provided with the battery box lock 2.
4 is fixed to the bracket 12 by the bolts 23 so as to be sandwiched between the bracket 12 and the bracket 12, and the mounting plate 24 a is fixed by the lock mounting bolts 25.

As shown in FIG. 7, the lock 24 has a hook 26 attached to a key cylinder portion 24c having a key hole 24b.
Is mounted movably, and by inserting the key 27 into the key hole 24b and twisting it clockwise in FIG. 7A, the hook 26 moves to the left in FIG. 7A and is unlocked. Has been adopted. In addition, this lock 24
By attaching to the connecting plate 15b as described above,
In the locked state, as shown in FIGS. 2 and 3, the hook 26 is formed so as to fit into the hook hole 15 c of the front wall of the battery case 15 and face the inside of the battery case 15.

With the hook 26 facing the battery case 15, the battery box 14 is
Is inserted, and the lower portion of the battery box 14 presses the upper inclined surface of the hook 26, whereby the hook 26 moves into the key cylinder portion 24c against the elastic force of the spring in the key cylinder portion 24c. Then, as shown in FIG. 3, when the battery box 14 is inserted to the lowermost part of the battery case 15, the hook 26 is engaged with the battery box 14 to be in a locked state.

A front end flange 28a of a chain case 28 is fixed to the lower part of the battery case 15 on the right side of the vehicle body, as shown in FIG. 15d extending through hole
And cover mounting brackets 15e, 15e projecting rearward of the vehicle body. The nut for fixing the front end flange 28a of the chain case 28 has a slit made of synthetic resin and has a structure whose diameter gradually increases as the bolt is tightened. FIG. 5 is drawn so that the appearance of the nut can be understood without breaking the nut. As shown in FIG. 3, a battery case guide 29 described later is fitted in the through hole 15d.

A motor-side terminal (not shown) connected to a discharge terminal (not shown) at the lower end of the battery box 14 is attached to the bottom wall of the battery case 15. The motor-side terminal has a structure in which the battery box 14 is inserted to the bottom of the battery case 15 to be automatically connected to the discharge terminal.

The battery box 14 accommodates a battery (not shown) inside, and the discharge terminal is connected to the electrode of the battery and the charging port 30 (FIG. 3) at the top of the battery box.
(See FIG. 2) and a charging terminal (not shown).
The opening of the charging port 30 is closed by the handle 31 when the handle 31 at the upper end of the battery box 14 is located at the storage position. The handle 31 is formed in a U-shape that opens to the right side of the vehicle body when viewed from above in the housed state shown in the drawing, and a tip of two sides of the U-shape is pivoted (not shown) with the front-rear direction of the vehicle body as an axial direction. It is rotatably mounted on the upper part of the battery box.

The battery case guide 29 is shown in FIG.
As shown in FIG.
And a guide portion 29b extending upward from the base portion 29a, and the upper end portion is supported by the seat stay 6. Also, this guide 29
As shown in FIG. 8, a structure is adopted in which the guide portion 29b fits into a guide groove 14a formed in the rear wall of the battery box 14 so as to penetrate vertically. A guide groove 14b extending in the vertical direction is also formed on the front wall of the battery box 14, and the guide piece 32 on the seat tube 5 side is fitted into the guide groove 14b.

The seat 33 attached to the upper end of the seat tube 5 is provided with a hinge mechanism indicated by reference numeral 34 in FIG. 3 so as not to be in the way when the battery box 14 is removed from the vehicle body. This hinge mechanism 34
By rotating the lock lever 34a counterclockwise in FIG. 3 against the resilient force of the tension coil spring 34c about the support shaft 34b, the seat 33 rotates counterclockwise in FIG. It has a rotating structure.

The cover 21 is formed so as to cover the power unit 13, the battery case 15, the inclined portion 4a of the down tube 4 and the lower end of the seat tube 5, as shown in FIGS. , A pair of left and right side covers 36, 37 extending downward from the sides of the upper cover 35, and these side covers 36, 3.
7 and an under cover 38 connected to the lower end of the cover 7. These cover members 35 to 38 are integrally formed of synthetic resin.

As shown in FIG. 13, the upper cover 35 has a semicircular hole 35a at its front end into which the down tube 4 is loosely fitted, and has an opening 35b for passing the seat tube 5, the battery box 14, and the like. Formed at the rear. In the same figure, 35c is a hole for inserting the front end of the battery box lock 24, and 35d is the upper cover 35 with the side covers 36, 37 and the rear end mounting plates 36a, 37a.
5 shows a mounting plate for fixing to a cover mounting bracket 15e of No. 5. FIG. 12 shows a state in which the front end of the lock 24 is inserted into the hole 35c, and the three cover members 35 to 37 are shown.
FIG. 21 shows the detailed structure of the fixing portion of FIG. As shown in FIG. 21, the mounting plate 35d of the upper cover 35 is formed so as to cover the mounting plates 36a and 37a of the side covers 36 and 37 from outside.

The front portion of the upper cover 35
Guide piece 3 engaging with upper edges of side covers 36 and 37
9 and 40 (see FIG. 13), the hooks 41 of the side covers 36 and 37, and the first locking pieces 43 and the second locking pieces 44 that lock the engagement rings 42.
7 fixed to the front. The guide piece 39 and the first
The locking piece 43 is formed as shown in FIG. 18, and the guide piece 40 is formed as shown in FIG.
Are formed as shown in FIG. The locking piece 43
27, as shown in FIG. 27, the holes are passed through openings 36b, 37b formed near the upper edges of the side covers 36, 37, and the holes 43a (at the distal end) in a state where the upper cover 35 and the side covers 36, 37 are combined. The hook 4 is shown in FIG.
1 are formed so as to engage with each other. In FIG. 20, the second locking pieces 44 are drawn on both sides in the left-right direction. However, the actual formation positions of these locking pieces 44 are set so as not to overlap in side view as shown in FIG. It is shifted in the front-back direction.

The side covers 36 and 37 are formed so that their front ends are connected to each other. When both are combined and the upper cover 35 is assembled, as shown in FIG. It has a structure in which a shaped hole 45 opens upward. To combine these cover members, the down tube 4
Perform so that With such a combination, the front ends of the three cover members 35 to 37 hold the down tube 4 in a loosely fitted state.

The front ends of the side covers 36 and 37 are connected to each other by a locking structure including a locking claw 46 and an engagement ring 47 shown in FIG. 22, and a fitting structure by a guide piece 48 shown in FIG.
With the fastening structure using the fastening member 49 shown in FIG.
They are fixed so that they do not separate from each other. The locking structure according to the present invention, that is, the locking structure for connecting the front ends of the upper cover 35 and the two side covers 36 and 37 includes the locking pieces 43 and 44, the hook 41, the engagement ring 4.
2, 47, a locking claw 46, a fastening member 49 and the like.

The fastening member 49 is similar to that of FIG.
As shown in FIG. 2, a connecting bracket 50 at a front end of the under cover 38 described later and circular connecting plates 51 and 52 of both side covers 36 and 37 are fastened. The fastening member 49 is detachable from the connection bracket 50 by pressing the front end portion on the front side of the vehicle body.

When the locking structure and the fitting structure are provided at the front ends of the side covers 36, 37, the front ends of the side covers 36, 37 are combined when the side covers 36, 37 and the upper cover 35 are combined. The two structures can be kept connected to each other. For this reason, assembly is easy.

The rear ends of the side covers 36 and 37 are fixed to the battery case 15 as described above, and are connected to the vehicle body frame 2 side so as to absorb the assembly accuracy by adopting the structure shown in FIG. ing. That is, the side cover 36 positioned on the left side of the vehicle body has the connecting pin 5 at the rear end.
The connecting pin 53 is connected to the power unit bracket 12 via a grommet 54 made of an elastic body. The side cover 37 is formed of a cylinder 5 having a shape into which the tip of the power unit mounting bolt 20 is fitted.
5 is formed integrally with the rear end portion, and a structure is adopted in which the fitting portion can be slightly shifted with respect to the vehicle body frame 2 at this fitting portion.

The under cover 38 has a structure that covers the power unit 13 from below. As shown in FIGS. 15 to 17, the bottomed cylinder 56 is integrally formed at the front end of the vehicle body with its opening facing the rear of the vehicle body. And this bottomed cylinder 5
6, the front end cylindrical portion of the motor 17 of the power unit 13 is loosely fitted, and the rear end portion is fixed to the lower surface of the controller 13c integrally formed with the power unit 13 by mounting bolts 57 as shown in FIG. ing. The connecting bracket 50 is integrally formed on the outer bottom surface of the bottomed cylinder 56. Also, on both upper sides of the under cover 38, the side covers 36,
A locking claw 59 that engages with the engagement ring 58 of the 37 is formed integrally. Therefore, the upper part of the under cover 38 is accommodated inside the both side covers 36 and 37, and the accuracy of alignment of these three cover members is not so required.

The cover 21 constructed as described above comprises a rear portion of the upper cover 35 and two side covers 36 and 3.
7 are fixed to one battery case 15, so that these cover members are assembled to the body frame 2 with the rear portions as a reference for the assembling position, while the front ends of these cover members are attached to the down tube 4. Since it is only holding, it is positioned along the down tube 4. For this reason, it is possible to increase the accuracy of the alignment between the cover members and the alignment accuracy between the cover member and the body frame 2 without being affected by the frame accuracy.

Further, the rear portion of the under cover 38 is fixed to the power unit 13 and the front portion has a structure in which the front portion of the power unit 13 is fitted.
Since the front parts of the side covers 36 and 37 are fixed to the front part of the power unit 8, the front part of the under cover 38 is fitted with the front part of the power unit 13 so that positional accuracy is improved and the fitting error can be absorbed by the fitting part. At the same time, since the side covers 36 and 37 are further fixed to the under cover 38, an assembly error can be absorbed by elastic deformation.

Further, since the front part of the under cover 38 is positioned by the fitting structure to the front part (motor 17) of the power unit 13, the mounting position of the under cover 38 is accurate.

Further, in this embodiment, since the lock 24 for the battery box is fixed to the battery case 15, the lock 24 and the upper cover 35 are attached to one component so that their mutual positions are accurate. is there. For this reason, even in a structure in which the front end of the lock 24 is inserted into the hole 35c of the upper cover 35, the gap formed in this insertion portion is substantially equal over the entire circumference of the lock 24. Therefore, not only the assembling becomes easy, but also the cover 21 having a good appearance can be obtained.

In addition, in this embodiment, since the rear end of the upper cover 35 is fixed to the battery case 15, the battery box 14 and the upper cover 35 are attached to the common battery case 15. For this reason, the alignment accuracy between the battery box 14 mounted on the battery case 15 and the opening 35b of the upper cover 35 is high.

In order to connect the upper cover 35 and the left and right side covers 36 and 37, a structure shown in FIG. 29 can be adopted. FIG. 29 is a cross-sectional view showing another embodiment of the cover coupling structure. In FIG. 29, the same or equivalent members as those described in FIGS. 1 to 28 are denoted by the same reference numerals, and detailed description is omitted. I do.

The battery case 15 shown in FIG. 29 has a portion of the side wall in the vehicle width direction projecting sideways.
1, the upper cover 35 and the side cover 36 or the side cover 37 are fixed. Although FIG. 29 shows only the right side of the vehicle body, the left side of the vehicle body has the same structure.
The nut 62 used for this fixing has a slit formed of a synthetic resin and has a structure whose diameter gradually increases as the bolt 63 is tightened. FIG. 29 is drawn so that the appearance of the nut can be understood without breaking the nut.

An opening 65 for inserting a tool 64 such as a screwdriver from inside the battery case 15 to the bolt 63 is formed above the overhanging portion 61 in the battery case 15.

With this configuration, the upper cover 3
In order to release the connection between 5 and the side covers 36 and 37, the battery box must be removed and the battery case 15 must be opened. That is, the cover member cannot be removed from the vehicle body unless a person who can release the battery box lock 24 (such as the owner of the electric bicycle 1) removes the cover member from the vehicle body.
4 cannot be removed to steal the battery box. Therefore, by adopting the coupling structure of this cover,
Theft can be prevented.

[0044]

According to the electric bicycle of the present invention, the power unit is fixed below the portion where the seat tube is connected to the down tube in the body frame, and the battery case is fixed to the body frame above the power unit. The case, the lower part of the down tube and the lower part of the seat tube are covered by an upper cover that covers the upper part of the power unit, a pair of left and right side covers that extend downward from the sides of the upper cover, and an under cover that is connected to the lower ends of these side covers. Cover, the rear parts of the upper cover and both side covers are fixed to the battery case, and the front ends are connected to each other via a locking structure. The front ends of these three cover members are lowered in a state where they are combined with each other. Because the structure is to hold the tube, the upper Since the rear part of the cover and the rear parts of the two side covers are fixed to one battery case, these cover members are mounted on the body frame with the rear part as a reference for the mounting position, while the front end parts of these cover members are Is just holding the down tube,
Positioned along the down tube. For this reason, the cover members are not affected by the frame accuracy,
Further, the accuracy of alignment between the cover member and the body frame can be made high.

Therefore, the accuracy of alignment between the cover members is good, and the number of fixing bolts can be reduced to improve the assembling property of the cover.

An electric bicycle according to another aspect of the present invention is the electric bicycle according to the above-described invention, wherein the rear part of the undercover is fixed to the power unit and the front part is fitted with the front part of the power unit. Since the front part of the side cover is fixed to the front part of the power unit, the front part of the under cover is fitted to the front part of the power unit, which increases the positional accuracy and at the same time can absorb the assembly error at the fitting part. Since the side cover is fixed, assembly errors can be absorbed by elastic deformation.

Therefore, the alignment accuracy of the upper cover, the two side covers and the under cover is good,
Assembly of these four cover members is easy. Also,
Since the front part of the undercover is positioned by the fitting structure on the front part of the power unit, the undercover can be accurately positioned on the power unit by fixing the rear part of the undercover to the power unit with bolts.

[Brief description of the drawings]

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

FIG. 2 is an enlarged side view showing a power unit mounting portion.

FIG. 3 is an enlarged side view showing a battery box mounting portion.

FIG. 4 is a diagram showing a battery box case.

FIG. 5 is a sectional view taken along line VV in FIG. 2;

FIG. 6 is a sectional view taken along line VI-VI in FIG. 2;

FIG. 7 is a view showing a lock for a battery box.

FIG. 8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is a rear view of the battery box guide.

FIG. 10 is a side view showing a state where the cover is assembled.

11 is a view as viewed in the direction of the arrow A in FIG.

FIG. 12 is a view as seen from the arrow B in FIG. 10;

FIG. 13 is a diagram showing an upper cover.

FIG. 14 is a side view of the side cover.

FIG. 15 is a side view of the under cover.

FIG. 16 is a diagram showing an under cover.

FIG. 17 is a sectional view taken along line XVII-XVII in FIG.

FIG. 18 is a cross-sectional view showing a coupling portion between a front portion of an upper cover and a front portion of a side cover.

19 is a sectional view taken along line XIX-XIX in FIG.

20 is a sectional view taken along line XX-XX in FIG.

21 is a sectional view taken along line XXI-XXI in FIG.

22 is a sectional view taken along line CC in FIG.

23 is a sectional view taken along line DD in FIG.

24 is a sectional view taken along line EE in FIG.

25 is a sectional view taken along line FF in FIG.

26 is a sectional view taken along line GG in FIG.

FIG. 27 is a perspective view showing a coupling structure of a front part of a cover.

FIG. 28 is an exploded perspective view of a cover.

FIG. 29 is a cross-sectional view showing another embodiment of the coupling structure of the cover.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electric bicycle, 2 ... Body frame, 4 ... Down tube, 5 ... Seat tube, 12 ... Bracket, 13 ... Power unit, 14 ... Battery box, 15 ... Battery case, 17 ... Motor, 21 ... Cover, 35 ... Upper cover , 36, 37 ... side cover, 38 ... under cover, 42, 47, 58 ... engagement ring, 43, 44 ... locking piece, 46, 59 ... locking claw, 50 ... connecting bracket, 5
1, 52: circular connecting plate.

Claims (2)

[Claims] 1. A battery in which a power unit having a crankshaft and a motor is fixed below a portion where a seat tube is connected to a down tube in a body frame, and a battery box is mounted on the body frame above the power unit. An upper cover for fixing the case, covering the power unit, the battery case, the lower part of the down tube, and the lower part of the seat tube to cover the upper part of the power unit, a pair of left and right side covers extending downward from the side of the upper cover, Cover with the under cover connected to the lower end of the side cover,
The rear parts of the upper cover and both side covers are fixed to the battery case, and the front ends are connected to each other via a locking structure. The front ends of these three cover members are lowered in a state where they are combined with each other. An electric bicycle having a structure for holding a tube. 2. The electric bicycle according to claim 1, wherein a rear portion of the undercover is fixed to the power unit and a front portion of the electric bicycle is fitted with a front portion of the power unit. An electric bicycle, characterized in that the bicycle is fixed.