JPH0443177A - Battery arrangement structure for motor-driven vehicle - Google Patents

Abstract

PURPOSE:To secure the sufficient bank angle by installing a battery in the lower part of a car body so as to nearly coincide with the bank corner of the car body, in the constitution in which the battery is mounted on the car body in free bank. CONSTITUTION:In a scooter type motorcycle, two floor side plates 81 extending in the longitudinal direction of a car body are welded in parallel with the left and right center frames F2 in pair which form a nearly U-figure shape on side view, and a battery case 82 having battery accommodation parts 821-823 formed integrally inside is fixed on the floor side plate 81 by bolts 83. An opened port 826 is formed on the bottom surface of each accommodation part 821-823, and batteries Ba1-Ba3 are placed on the upper part of a bottom plate 84 covering the opened port 826. At this time, a large-sized battery Ba1 is installed in the accommodation part 821 at the center of the car body, and small-sized batteries Ba2 and Ba3 are installed in the accommodation parts 822 and 823 on both the sides, and each bottom surface of the left and right batteries Ba2 and Ba3 is arranged with step difference higher than the bottom surface of the center battery Ba1 along the bank angle.

Description

DETAILED DESCRIPTION OF THE INVENTION A9 Object of the Invention (1) Field of Industrial Application The present invention relates to a battery arrangement structure for an electric vehicle whose power source is an electric motor driven by a battery.

(2) Conventional technology Vehicles such as motorcycles and three-wheeled motorcycles are normally powered by an internal combustion engine, but electric vehicles, which are powered by an electric motor driven by a battery instead of the internal combustion engine, have been developed in the public sector since then. 5
It is known from the publication No. 1-15272. in this way,
If an electric motor is used instead of a conventional internal combustion engine as the power source for a vehicle, accessories such as an air cleaner, carburetor, muffler, fuel tank, and starting device can be omitted, resulting in a simple structure and excellent handling. You can get a new vehicle.

(3) Problems to be Solved by the Invention Incidentally, batteries for electric vehicles generally have a large capacity and are inevitably heavy, so it is desirable to mount the battery as low as possible on the vehicle body. However, when the battery is mounted at the lower part of the vehicle body, there is a risk that the battery may interfere with the ground when the vehicle body banks, resulting in the inconvenience that a sufficient bank angle cannot be secured.

The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a battery arrangement structure for an electric vehicle that can ensure a sufficient bank angle even when the battery is mounted in the lower part of the vehicle body.

B9 Structure of the invention (1) Means for solving the problem In order to achieve the above object, the battery arrangement structure for an electric vehicle of the present invention is an electric vehicle in which a battery is mounted on a bankable vehicle body suspended by front wheels and rear wheels. A first feature of the vehicle is that the battery is mounted at a lower part of the vehicle body so as to substantially match the bank angle of the vehicle body.

In addition to the first feature, a second feature of the present invention is that three or more batteries are mounted in the left-right direction of the vehicle body, and the bottom surfaces of the left and right battery packs are arranged at a higher position than the bottom surface of the center battery pack. The characteristics of

In addition to the first feature, a third feature of the present invention is that a plurality of batteries are mounted in the left-right direction of the vehicle body, and the upper part of the battery is inclined outward in the left-right direction.

In addition to the first, second or third feature, the present invention also provides:
A fourth feature is that the cover that covers the battery is provided with a ventilation hole for introducing running wind.

(2) Effect According to the first feature described above, the battery is mounted at the bottom of the vehicle body so as to approximately match the bank angle, so even if the battery is mounted at a low position to lower the center of gravity of the vehicle body, A sufficiently large bank angle can be secured while avoiding interference between the lower part of the vehicle body and the ground.

According to the second feature of the present invention, among the three or more batteries mounted in the left-right direction of the vehicle body, the bottom surface of the center battery is low and the bottom surfaces of the left and right batteries are high. , the battery bottom shape can be easily matched to the bank angle.

Further, according to the third feature of the present invention, the plurality of batteries mounted in the left-right direction of the vehicle body are arranged such that their upper parts are inclined outward in the left-right direction, so that the bottom shape of the battery can be easily adjusted to the bank angle. can be matched.

Furthermore, according to the fourth feature of the present invention, cooling of the battery is promoted by the running air introduced from the ventilation hole into the cover that covers the pantry.

(3) Examples Hereinafter, the present invention will be described in detail based on the drawings.

FIG. 1 is an overall side view of a motorcycle (2) to which the battery arrangement structure according to the present invention is applied, and its body frame F is composed of a front frame F1% center frame Ft made of steel pipes, and a rear frame F. The outside is leg shield 81% step floor Bu, rear cover B1,
It is covered with a synthetic resin body B composed of a removable undercover B4 and a removable undercover B4. Front frame F.

The head vibe 1 fixed on the head has a steering handle 2 on the top end.
A front fork 4 having a front wheel Wf pivoted thereon via a front cushion 3 is pivotally supported at its lower end.

At the rear of the central frame F2, the front end of the swing-type power unit l-P, which has the rear wheel Wr mounted on its rear end, is attached to the pivot 5.
The rear upper surface of the power unit (P) and the rear frame F are connected via a reaction 6. A stand 7 provided on the central frame Fz covers the lower front surface of the power unit (P) in the illustrated storage position, and also serves as a protection member for a drive motor, which will be described later, housed inside. A storage compartment 9 is provided between the power unit P and the seat 8 for storing a helmet and the like. This container 9 is designed to prevent stored items such as floppy disks from being affected by the magnetism generated by the motor.
It is made of a material that shields magnetism, such as conductive resin.

The central frame F2 is provided with a battery storage section 10 that stores a battery as a power source for driving the motor.

Further, in front of the head pipe 1, a controller 11 for controlling the drive of the motor and a charger 12 for charging the battery are provided.

Note that the controller is located at 11 indicated by a chain line at the rear of the vehicle body.
．． The charger can be installed at the 12+ position at the rear of the vehicle, or at the 12□ position at the center of the vehicle.

Next, the structure of the power unit P will be explained in detail based on FIG. The power unit P includes a transmission case 13 at the front end through which the pivot 5 passes through from side to side, and a motor M provided at the front of the transmission case 13 and a reduction gear 8114 provided at the rear thereof are connected via a belt type continuously variable transmission 1115.

The motor M is housed inside a motor housing 16 formed integrally with the front part of the transmission case 13, and an opening on the right side thereof is closed by a lid member 18 fixed with a port 17.

The rotating shaft 19 of the motor M is connected to a ball bearing 20 provided on the lid member 18 and a wall portion 16 at the left end of the motor housing 16.
It is supported by a ball bearing 21 provided at +.

A cooling fan 22 is provided at the right end of the rotating shaft 19 protruding from the lid member 18, and the outer periphery of the cooling fan 22 is covered with a fan cover 23 having an air intake port 231. The air introduced from the air intake port 231 by the cooling fan 22 flows into the motor housing 16 through the through hole 18 of the cover member 18, and after cooling the motor M, the air is introduced through the through hole of the wall portion 161. 16, into the transmission case 13. This air further flows backward inside the transmission case 13 to cool the belt-type continuously variable transmission 15, and then passes through the air exhaust port 13 formed at the rear end of the transmission case 13. is discharged to the outside. On the other hand, the left end of the rotating shaft 19 that passes through the wall 16+ of the motor housing 16 and extends into the transmission case 13 is directly used as an input shaft of the belt type continuously variable transmission 15.

The motor M is a DC brushless motor, and has a rotating shaft 19.
A rotor 33 has permanent magnets 32 arranged around the outer periphery of an iron core 31 fixed to the rotor 33, and bolts 34 are installed inside the motor housing 16.
The rotary motor is equipped with a stator 37 consisting of a coil 36 wound around an iron core 35 fixed to a rotary shaft 19, a magnet 38 fixed to a rotating shaft 19, and three Hall elements 39 arranged opposite to the outer periphery of the magnet 38. A child position sensor 40 is provided.

FIG. 3 is a circuit diagram showing the control system of the motor M. In order to control the rotational speed of the motor M, the potential of the potentiometer 42 connected to the accelerator grip 41 of the steering handle 2,
A phase signal of the rotor 33 detected by the rotor position sensor 40 is input to the controller 11 . A driver 43 interposed between the controller 11 and the motor M
is a switching circuit that controls the FE744 group based on signals from six field effect transistors (hereinafter abbreviated as FET) 44 and the rotor position sensor 40, and sequentially switches the stator current of the motor M. 45.

As shown in FIGS. 4 to 6, a ring-shaped fixing bracket 47 is fixed to the middle of the handle pipe 46 of the steering handle 2, rotatably fitted to the tip of the handle vibe 46, and an accelerator is attached to the outer periphery of the ring-shaped fixing bracket 47. A torsion spring 49 for biasing the accelerator grip 41 toward the idling position is installed between the grip 41 and the cylindrical rotation bracket 48 into which the grip 41 is press-fitted. The potentiometer 42, which is activated by rotating the accelerator grip 41, is mounted on an arc-shaped printed circuit board 50 fixed to the bottom of the fixed bracket 47.
Conductor 501 and resistor 5 printed parallel to the 0 surface
0. The conductor 50 and the resistor 50□ are equipped with
Potentials of 0 volts and 5 volts are applied, respectively. An arcuate guide groove 51 is provided inside the fixed bracket 47.
．． A guide plate 51 is fixed in parallel to the printed circuit board 50, and a projection 52 formed on the back surface of a sliding member 52 disposed between the printed circuit board 50 and the guide plate 51.
．． passes through the guide groove 511 of the guide plate 51 and is supported by the rotating bracket 48 . In front of the sliding member 52, a metal plate 53 electrically connected to the controller 11 is connected to the conductor 501 of the printed circuit board 50.
and the resistor 50□ at the same time. When the accelerator grip 41 is in the idling position shown in the figure, the potential of the metal plate 53 is approximately 0.5 volts, and when the accelerator grip 41 is rotated in the direction of the arrow toward the full load position, the potential decreases. increases gradually to about 4.5 volts.

Next, referring again to FIG. 2, the structure of the belt type continuously variable transmission 15 housed inside the transmission case 13 will be explained. The belt-type continuously variable transmission 15 includes a driving pulley 61 provided on a rotating shaft 19 that protrudes into the transmission case 13 from the motor housing 16 side, and a driven pulley provided on a reducer input shaft 62 supported at the rear of the transmission case 13. 63, and an endless heald 64 is wound around both pulleys 61 and 63. The drive boob IJ61 consists of a fixed pulley half 611 fixed to the rotating shaft 19 and a movable pulley half 61i supported by the rotating shaft 19 so as to be slidable in the axial direction. □ and the lamp plate 6 fixed to the rotating shaft 19
5, a centrifugal weight 66 is disposed so as to be movable in the radial direction. On the other hand, the driven pulley 63 is connected to the reducer input shaft 62.
The driven pulley 63 consists of a fixed pulley half 631 and a movable pulley half 632 supported by a collar 68 that is relatively rotatably fitted through a needle bearing 67.
The driving force transmitted to is transmitted to the reduction gear input shaft 62 via an automatic centrifugal clutch 69.

The side surface of the transmission case 13 housing the belt type continuously variable transmission 15 and the automatic centrifugal clutch 69 is closed by a detachable side cover 13□.

The reducer input shaft 62 is supported by a ball bearing 70 provided on the transmission case 13 and a ball bearing 72 provided on the reducer cover 71, and is supported by a pair of ball bearings 73 similarly provided on the transmission case 13 and the reducer cover 71.
．． An intermediate shaft 76 is supported between the rear wheel Wr and the axle 75 supported by the rear wheel Wr. The rotation of the input gear 77 of the reducer input shaft 62 is controlled by the two intermediate gears 78 of the intermediate shaft 76.
79 to the output gear 80 of the axle 75.

7 and 8 show the central part of the vehicle body where the battery is mounted, and the pair of left and right central frames F2, which are approximately U-shaped in side view, have two floor side plates 81 extending in the longitudinal direction of the vehicle body. are welded in parallel, and the floor side plate 81 has three batteries Ba, , Ba
storage section 82 that can hold z, Baz. ．． 822.82
A battery case 82 integrally formed with the battery case 82 is fixed with bolts 83. Each storage section 82+~82. There is an opening 8 on the bottom of the
24 is formed and an opening 82. Battery Ba1. Bag and Bax are placed. At this time, a large batch IJ is placed in the storage section 821 in the center of the vehicle body.
B a is equipped with small batteries Ba, , Ba, in the storage sections 822 and 823 on both sides thereof, and left and right batteries Baz.

The bottom of Bax is higher than the bottom of the central battery Ba (
They are arranged at different levels so that Further, the central frame F2 contacts the stepped portion of the battery case 82, that is, the bottom surfaces of the left and right storage portions 82□, 823, and together with the floor side plate 81, the batteries Bat, Bag, Ba
Accepts the weight of s.

The upper opening of the battery case 82 is covered with a removable floorboard 85, and the central frame Fz
A removable undercover 84 that covers the bottom surface of the buffing case 82 is removably attached to the bracket 86 provided in the bracket 86 .

Next, the operation of the embodiment of the present invention having the above-described configuration will be explained.

When the accelerator grip 41 is in the idling position and the rotational speed of the motor M is low, the automatic centrifugal clutch 69 is in a disengaged state, and the driving force of the motor M is applied to the rear wheel W.
Not transmitted to r. From this state, the accelerator grip 41
When the rotation speed of the motor M is increased by rotating the motor M, the centrifugal weight 66 moves radially outward along the ramp plate 65 fixed to the rotation shaft 19, and the drive pulley 61
The movable pulley half 61□ is moved in a direction approaching the fixed pulley half 61. As a result, the drive pulley 6
As the effective radius of 1 increases, the movable pulley half 63□ of the driven pulley 63 moves to the stationary pulley half 63. and its effective radius decreases. As a result, the belt type continuously variable transmission 15
When the reduction ratio of the motor M decreases and the rotational speed of the collar 68 rotating together with the driven boob IJ 63 increases, the automatic centrifugal clutch 69 is connected and the driving force of the motor M is transmitted to the reducer input shaft 62. The rear wheels Wr are driven via the reduction gear 14.

Air introduced from the air intake port 23° of the fan cover 23 by the cooling fan 22 provided on the rotating shaft 19 of the motor M passes through the inside of the motor housing 16 to cool the motor M, and then flows into the inside of the transmission case 13. to cool the belt type continuously variable transmission 15 and the automatic centrifugal clutch 69,
The air is discharged to the outside from the exhaust port 131.

Now, the batteries Ba, Baz, B mounted on the bottom of the car body.
Since az is arranged along the bank angle so that the center part is low and the both sides are high, the large capacity battery Ba,
, Baz, and Bas are installed, the bottom of the vehicle body and the ground are prevented from interfering with each other when banking.

To replace batteries BaI, Bat, and Bas, after removing undercover B4 and floorboard 85,
By pushing up the bottom plate 84 from the underside of the vehicle body through the opening 824 of the pantry case 82, the batteries Ba, Ba
All you have to do is expose the upper part of the Bax from the floor, grab the exposed part, and take it out. At this time, as shown in FIG. 9, a locking step 87 is formed on the side surface of the batteries Bat, Ba, Baz, and a jig 88 having a hook 881 that engages with the locking step 87 is installed. Using battery Ba+
, Baz, and Bax may be attached and detached, and in that case, the bottom plate 84 becomes unnecessary. In addition, as another method, as shown in Fig. 1O (A) and (B),
, Ba! , a groove 90 is formed using the thin wall part 89 for weight reduction formed at the center of the bottom surface of the battery Ba3, and by pulling a loop-shaped string 91 that is locked in this groove 90, the battery Ba
, , B z * B a s can be extracted.

11 and 12 show a second embodiment of the present invention, in which FIG. 11 is the same sectional view as FIG. 9, and FIG. 12 is a sectional view taken along the line xn-xn in FIG. 11.

In this embodiment, one central frame F2 is arranged at the center of the vehicle body, and cross members 92, 9 extending in the left and right direction of the vehicle body are provided at the front and rear parts of the central frame F2.
3 penetrates. A pair of left and right floor side frames 81 are disposed in the front-rear direction between the ends of the front and rear cross members 92 and 93 via brackets 94 and 95, and a battery case 82 is positioned between the two floor side frames 81.
is fixed at Porto 83. And the central frame F,
The bottom of the battery case 82 and the undercover 84 are supported by the two brackets 86 fixed to the bottom of the battery case 82 . There are two batteries Ba in the battery case 82.
,, a pair of left and right storage sections 82. which have rubber cushions 96 to support the Bass. ．． 825 are formed, and the storage portions 82, . Battery Ba4.82s placed on the cushion 96. Bas is three cushions 9 provided on the lower surface of the floorboard 85 that covers the upper opening of the storage section 82.
Fixed by 7.98. Therefore, both batteries Ba
4. The Bas is supported in an inverted U-shape so that its upper part is inclined outward in the left-right direction of the vehicle body.

Also according to this embodiment, battery Ba4. Since Ba is arranged so that it almost matches the bank angle, a sufficient bank angle can be secured while avoiding interference with the ground, and the triangle formed between the bottom surfaces of the left and right batteries Ba4°Bas The central frame F2 can be disposed by effectively utilizing the space.

FIG. 13 shows a third embodiment of the present invention.
FIG. 3 is a sectional view corresponding to the figure.

In this embodiment, two batteries Ba4. The Bas is supported in an inverted V-shape, and its upper part is fixed with a lid member 99 that covers the upper opening of the battery case 82, and a battery storage space 100 defined by the battery case 82 and the lid member 99 is It communicates with the inside of the undercover 84 through a communication hole 101 formed in the battery case 82 . A louver-shaped ventilation opening 102 is formed in the front part of the undercover 84 to introduce the running wind.

According to this embodiment, the air inside the battery storage space 100 is sucked out to the outside by the negative pressure generated by the running wind introduced from the ventilation port 102 and flowing inside the undercover 84, so that the motor M is driven. Battery Ba4 generated heat due to Bas can be effectively cooled.

FIG. 14 shows a fourth embodiment of the present invention.
FIG. 3 is a sectional view corresponding to the figure.

This embodiment is characterized in that the cross-sectional shape of the battery Ba is formed into a downwardly convex arc shape so as to substantially match the bank angle. By adopting such a battery shape, Battery Ba.

It is possible to increase the volume by maximizing the use of the space for storing the.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various small design changes can be made without departing from the scope of the present invention as set forth in the claims. be.

For example, the present invention is applicable not only to motorcycles (1) but also to other vehicles such as tricycles.

Effects of the C0 Invention As described above, according to the first feature of the present invention, since the battery is mounted at the bottom of the vehicle body so as to approximately match the bank angle, the center of gravity of the vehicle body is lowered and stability is improved. , the gap between the lower part of the car body and the ground is secured, allowing a sufficiently large bank angle.

According to the second feature of the present invention, among the three or more batteries mounted in the left-right direction of the vehicle body, the bottom surface of the center battery is low and the bottom surfaces of the left and right batteries are high. , the battery bottom shape can be easily matched to the bank angle.

Further, according to the third feature of the present invention, the plurality of batteries mounted in the left-right direction of the vehicle body are arranged such that their upper parts are inclined outward in the left-right direction, so that the bottom shape of the battery can be easily adjusted to the bank angle. can be matched.

Furthermore, according to the fourth feature of the present invention, since the running wind is introduced into the inside of the cover that covers the battery through the ventilation opening, the battery can be efficiently cooled.

[Brief explanation of the drawing]

FIG. 1 is an overall side view of a motorcycle to which a battery arrangement structure according to a first embodiment of the present invention is applied, and FIG. 2 is a side view of the motorcycle shown in FIG.
-■ line sectional view, Figure 3 is a circuit diagram showing the motor control system,
Figure 4 is a longitudinal sectional view of the accelerator grip showing the structure of the potentiometer seen from the front of the vehicle, and Figure 5 is the V-
6 is a sectional view taken along the line ■-■ in FIG. 4, FIG. 7 is a sectional view taken along the line ■-■ in FIG. 1, FIG. 8 is a sectional view taken along the line ■-■ in FIG. 7, 9 and 10 are diagrams showing the method of attaching and detaching the battery, FIGS. 11 and 12 are diagrams showing a second embodiment of the present invention, and FIG. 11 is a sectional view corresponding to the above-mentioned FIG. 7; FIG. 12 is a sectional view taken along the line X■X■ in FIG. 11, FIG. 13 is a sectional view corresponding to FIG. 7 showing a third embodiment of the present invention, and FIG. 14 is a fourth embodiment of the present invention. FIG. 7 is a sectional view corresponding to FIG. Wf...Front wheel, Wr...Rear wheel, B4...Cover (
Under cover), Ba+ ~ Ba, ... battery, 1
02...Ventilation

Claims (1)

[Scope of Claims] [1] In an electric vehicle in which batteries (Ba_1 to Ba_6) are mounted on a bankable vehicle body suspended by front wheels (Wf) and rear wheels (Wr), the batteries (Ba_1 to Ba_6) are mounted on the vehicle body. A battery arrangement structure for an electric vehicle, characterized in that the battery is mounted at the bottom of the vehicle body approximately in line with the bank angle. [2] Three or more batteries (Ba_1 to Ba_3) are mounted on the left and right sides of the vehicle, and the left and right batteries (Ba_2, Ba_3)
The battery arrangement structure for an electric vehicle according to claim 1, wherein the bottom surface of the battery (Ba_3) is disposed at a higher position than the bottom surface of the central battery (Ba_1). [3] A plurality of batteries (Ba_4, Ba_5) are mounted on the left and right sides of the vehicle, and the batteries (Ba_4, Ba_5)
2. The battery arrangement structure for an electric vehicle according to claim 1, wherein the upper part of the battery is inclined outward in the left-right direction. [4] Claim [1], [2] or [2] characterized in that the cover (B_4) covering the batteries (Ba_1 to Ba_6) is provided with a ventilation hole (102) for introducing running wind.
3] Battery arrangement structure of the electric vehicle described.