JP2000238674A - Battery mounting and demounting structure for electric car - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily mount and demount batteries to a car body frame. SOLUTION: This battery mounting and demounting structure is formed by accommodating batteres in a car body frame extending from a head pipe 2 to a rear part of a car body. On this occasion, the vertically divided steering shafts are coaxially mounted on the upper and lower parts of the head pipe 2, the batteries 35, 36 are respectively demountably mounted on a top tube 14 and a down tube 15 as the car body frames, through a battery mounting and demounting port 2a opened on a front surface of the head pipe 2. That is, as the batteries 35, 36 are demountably mounted on the top tube 14 and the down tube 15 through the battery mounting and demounting port 2a opened on the front surface of the head pipe 2, the batteries 35, 36 can be easily mounted and demounted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery attaching / detaching structure for an electric bicycle in which a battery is accommodated in a vehicle body frame extending rearward from a head pipe to a vehicle body.

[0002]

2. Description of the Related Art In recent years, electric bicycles have been proposed and already put into practical use. However, in this electric bicycle, a driving force by human power is supplemented by an auxiliary power by an electric motor. It is essential.

By the way, the battery should be placed in a place where it does not obstruct the rider when getting on and off, and in consideration of this point, a proposal has been made to removably store the battery in the body frame.

[0004]

However, in a conventional electric bicycle in which a battery is detachably accommodated in a vehicle body frame, it is not easy to attach and detach the battery to and from the vehicle body frame, and improvement in this respect has been desired.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a battery detachable structure for an electric bicycle in which a battery can be easily detached from a vehicle body frame. It is in.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the invention according to claim 1 is directed to a battery detachable structure for an electric bicycle comprising a battery housed in a body frame extending rearward from the head pipe to the body. A vertically divided steering shaft is mounted coaxially above and below the head pipe, and the battery is attached to and detached from the vehicle body frame through a battery opening opening at the front of the head pipe. And

According to a second aspect of the present invention, in the first aspect of the invention, a pair of left and right front forks that rotatably support a front wheel at the lower end extend to above the head pipe. Are rotatably supported on the steering shaft via upper and lower brackets.

According to a third aspect of the present invention, in the first aspect of the present invention, the battery outlet opening to the head pipe is covered by a removable lid member.

Therefore, according to the present invention, the battery is attached to and detached from the vehicle body frame via the battery attaching / detaching opening formed on the front surface of the head pipe, so that the battery can be easily attached to and detached from the vehicle body frame.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a side view of an electric bicycle having a battery detachable structure according to the present invention, FIG. 2 is a cutaway side view around a head pipe of the electric bicycle, FIG. 3 is a cutaway front view, and FIG. And FIG. 5 is a perspective view showing an electric contact structure between a battery and a controller.

In the electric bicycle 1 shown in FIG. 1, reference numeral 2 denotes a head pipe located in the upper front part of the vehicle body. As shown in FIGS. , 4 are mounted coaxially. Specifically, the steering shafts 3 and 4 penetrate the upper and lower surfaces from the inside of the head pipe 2 and are exposed to the outside,
By tightening the bearings 5a and 6a screwed to the exposed portions, these steering shafts 3 and 4 are attached to the upper and lower sides of the head pipe 2, respectively.

The upper and lower steering shafts 3 and 4 respectively have central portions in the width direction of an upper bracket 7 and an under bracket 8 inserted therein, and the upper bracket 7 and the under bracket 8 are connected to the respective steering shafts 3 and 4.
The upper and lower pair of bearings 5a, 5b and 6
The steering shafts 3 and 4 are rotatably supported by the steering shafts 3 and 4 via a and 6b. The upper steering shaft 3
A cap nut 9 is attached to the upper part of the head. As shown in FIGS. 2 and 3, a cap 10 for preventing water from entering is provided in the front half of the outer periphery of the upper end of the head pipe 2, and a gap is formed between the cap 10 and the inside of the cap 10. Have been.

On the other hand, as shown in FIG.
The upper portions of a pair of left and right front forks 12 rotatably supporting the first 1 extend above the head pipe 2,
The upper part of each front fork 12 is inserted and supported by the widthwise ends of the upper bracket 7 and the under bracket 8.

A handle 13 is attached to the upper bracket 7. Therefore, when the handle 13 is rotated left and right, the front wheel 11 is moved through the pair of left and right front forks 12 so that the upper and lower steering shafts 3 are turned. , 4 to the left and right to perform required steering.

On the other hand, as shown in FIG. 1, a top tube 14 and a down tube 15 extend from the head pipe 2 toward the rear of the vehicle body.
Has a substantially hollow rectangular cross section, and extends obliquely downward below the top tube 14 toward the rear of the vehicle body. A seat tube 16 extends obliquely upward from the rear end of the down tube 15 toward the rear of the vehicle body.
Are fitted and held movably up and down, and a saddle 18 is provided at the upper end thereof.
Is attached.

On both sides of the rear end of the down tube 15, there are provided rear arms 19 which are bent and shaped in a side view.
The front end of the rear arm 19 is pivotally mounted on a pivot shaft 20 so as to be swingable up and down.
Are rotatably supported. And the rear arm 19
Between the seat cushion 16 and the rear cushion 2
A rear arm 19 and a rear wheel 21 pivotally supported by the rear arm 19 are suspended from the vehicle body.

As shown in FIGS. 1 and 4, between the front wheel 11 and the rear wheel 21, the down tube 1 is provided.
A power unit 23 is attached to the lower part of the rear end of the power supply unit 5 via a metal bracket 24. The power unit 24 has a drive system using human power and a drive system using an electric motor 25 arranged side by side.
5, a controller 26 housed in the rear end of the down tube 15, a treading force detecting means (not shown) and the like are included.

The power unit 23 has a crankshaft 27 disposed in the lateral direction (perpendicular to the plane of FIG. 1).
Are rotatably supported. Cranks 28 (only one is shown in FIG. 1) are attached to left and right ends of the crankshaft 27, and a pedal 29 is attached to an end of each crank 28.
Is supported.

A large-diameter drive sprocket 30 is mounted on the crankshaft 27. An endless chain is provided between the drive sprocket 30 and the small-diameter wheel sprocket 31 mounted on the rear wheel 21. 32 are wound. The chain 32 is given a predetermined tension by tensioners 33 and 34.

Thus, the electric bicycle 1 is indispensable to mount a battery as a drive source of the power unit 23. In the present embodiment, as shown in FIG. Battery 35, 3
6 are detachably stored.

The one battery 35 includes a plurality of rechargeable rechargeable batteries 35a stored in the top tube 14 in a horizontal state, and the other battery 36 includes a plurality of rechargeable rechargeable batteries 36a. It is configured to be stored vertically in the down tube 15. A damper 3 for vibration absorption is provided at the innermost part (rear end) in the top tube 14.
7 are accommodated.

As shown in detail in FIG. 4, the rear end surface of the down tube 15 is open, and the controller 26 is connected to the down tube 15 through the rear end opening.
The controller 26 is fixed to the down tube 15 by screws 38. Then, after the controller 26 is inserted into the down tube 15 and fixed, the lead wire 39 led out from the controller 26 is provided.
Is connected to the lead wire 41 of the electric motor 25 by a coupler 40, and finally the rear end opening of the down tube 15 is closed by a cap 42.

Here, the battery attaching / detaching structure according to the present invention will be described with reference to FIGS.

The front end of the top tube 14 and the front end of the down tube 15 are respectively opened at the rear surface of the head pipe 2, and a substantially rectangular battery opening 2 a is formed at the front side of the head pipe 2. are doing. And
When the batteries 35 and 36 are not attached or detached, the battery attachment / detachment port 2 a is closed by a lid member 43 formed into an arcuate curved shape along the outer surface shape of the head pipe 2. That is, after inserting the upper end edge of the lid member 43 into a gap formed inside the water entry prevention cap 10, the lower end center portion is fixed to the front surface of the head pipe 2 by the screw 44, thereby forming the head pipe 2. And detachably attached to the cover to cover the battery opening 2a.

When the batteries 35 and 36 are stored in the top tube 14 and the down tube 15, respectively, the cover member 43 covering the battery opening 2a formed in the head pipe 2 is removed from the head pipe 2. Remove.
That is, if the screw 44 is removed and the lid member 43 is pulled downward, the upper edge of the lid member 43 comes off the cap 10 and the lid member 43 is easily removed.

As described above, the lid member 43 is connected to the head pipe 2
When the battery 35 is removed from the head pipe 2, a battery outlet 2a is opened at the front of the head pipe 2. Therefore, one battery 35 is inserted into the top tube 14 from the battery outlet 2a through the head pipe 2 and stored therein. The other battery 36 can be inserted into the down tube 15 from the battery opening 2a through the head pipe 2 and stored therein. When the batteries 35, 36 are stored, the leads 45, 46 derived from the batteries 35, 36 are connected to each other by a coupler 47 as shown in FIG. Can be connected to

As shown in FIG. 5, the front surface of the controller 26 is formed in a concave curved shape along the shape of the longitudinal end of the battery 36, and electrode plates 48 are mounted on the upper and lower sides thereof. Electrode plates 49 are attached to the upper and lower sides of one end surface in the longitudinal direction (the surface facing the controller 26) of the battery 36. When the battery 36 is inserted and set in the down tube 15 as described above, An electrode plate 49 attached to one longitudinal end of 36
Contacts the electrode plate 48 on the controller 26 side, and the battery 36 and the controller 26 are electrically connected.

The pedaling force of the rider while the electric bicycle 1 is traveling is detected by a pedaling force detecting means (not shown) incorporated in the power unit 23, and a detection signal is input to the controller 26. Then, the controller 26
Supplies electric power from the batteries 35 and 36 to the electric motor 25 according to the magnitude of the pedaling force. Therefore, the electric motor 25 generates auxiliary power according to the pedaling force and outputs it to the crankshaft 27. As a result, the crankshaft 27 is rotationally driven by both the pedaling force and the auxiliary power, and the rotation is transmitted to the rear wheel 21 via the drive sprocket 30, the chain 32, and the wheel sprocket 31, and the rear wheel 21 is rotationally driven to rotate the electric bicycle. 1 is made to run. As described above, in the electric bicycle 1, the driving force of the rear wheel 21 is supplemented by the auxiliary power of the electric motor 25, so that the physical load on the rider is reduced by that much.

By the way, the batteries 35, 3
6, the batteries 35, 36
When charging is performed, after removing the lid member 43 that covers the battery attachment / detachment port 2a of the head pipe 2 in the manner described above,
The batteries 35 and 36 are taken out of the top tube 14 and the down tube 15 through the battery opening 2a, respectively. When the charging of the batteries 35 and 36 is completed, the batteries 35 and 36 are stored in the top tube 14 and the down tube 15 as described above, respectively.
Finally, the lid member 43 is attached to the head pipe 2 in the above-described manner, and the battery removing port 2a is closed by the lid member 43, so that the charging and removing operations of the batteries 35 and 36 are completed, and these batteries 35 and 36 are used again. be able to.

In the above, in the present embodiment, the batteries 35 and 36 are attached to and detached from the top tube 14 and the down tube 15 through the battery attachment / detachment opening 2a opened on the front surface of the head pipe 2. The work of attaching and detaching the batteries 35 and 36 is facilitated.

Also, since the batteries 35 and 36 are housed in the existing top tube 14 and down tube 15, respectively, parts such as a battery box for housing them are not required, so that the number of parts can be reduced, cost can be reduced, and In addition to saving space, the external appearance of the electric bicycle 1 is enhanced.

[0033]

As is apparent from the above description, according to the present invention, in the battery attaching / detaching structure of the electric bicycle in which the battery is housed in the body frame extending from the head pipe to the rear of the vehicle body, the upper and lower parts are provided. The divided steering shaft is mounted coaxially above and below the head pipe, and the battery is attached to and detached from the vehicle body frame via a battery attachment / detachment opening that opens to the front of the head pipe. Thus, the effect of being able to be easily detached is obtained.

[Brief description of the drawings]

FIG. 1 is a side view of an electric bicycle including a battery attaching / detaching structure according to the present invention.

FIG. 2 is a cutaway side view around the head pipe of the electric bicycle including the battery attaching / detaching structure according to the present invention.

FIG. 3 is a cutaway side view around the head pipe of the electric bicycle including the battery attaching / detaching structure according to the present invention.

FIG. 4 is a side sectional view of a power unit portion of the electric bicycle including the battery attaching / detaching structure according to the present invention.

FIG. 5 is a perspective view showing an electrical contact structure between a battery and a controller.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric bicycle 2 Head pipe 2a Battery opening 3, 4 Steering axis 7 Upper bracket (bracket) 8 Under bracket (bracket) 12 Front fork 14 Top tube (body frame) 15 Down tube (body frame) 35, 36 Battery 43 Lid Element

Claims (3)

[Claims] 1. A battery attachment / detachment structure for an electric bicycle comprising a battery housed in a vehicle body frame extending from a head pipe to a vehicle body rearward, wherein a vertically divided steering shaft is coaxially arranged vertically above and below the head pipe. A battery attachment / detachment structure for an electric bicycle, wherein the battery is attached / detached to / from a vehicle body frame through a battery attachment / detachment opening which is attached to a front surface of a head pipe. 2. A pair of left and right front forks that rotatably support a front wheel at lower ends thereof extend to above the head pipe, and the front forks are rotatable about the steering shaft via upper and lower brackets. The battery detachable structure for an electric bicycle according to claim 1, wherein the battery is detachably supported. 3. The battery attachment / detachment structure for an electric bicycle according to claim 1, wherein a battery attachment / detachment opening opened to the head pipe is covered by a detachable lid member.