[0001] The present invention relates to a two-wheeled electric vehicle, more particularly to a battery used as a power source of the two-wheeled electric vehicle.
BACKGROUND
[0002] A two-wheeled electric vehicle comprises an electric motor powered by a battery, and a rear wheel driven by the electric motor. Range of an electric vehicle is influenced by capacity of the battery installed. The distance that the electric vehicle can travel on a single charge can be made longer in proportion to an increase in capacity of the battery. Therefore, it is recommended to make the size of the battery bigger in order to increase the battery capacity and hence, the range of the electric vehicle.
[0003] Generally, in two wheeled vehicles, a down tube extent in a rearward direction under a floorboard from a head tube to increase the frame rigidity. This down tube provides hindrance while disposing the battery over or below the down tube. If the battery is disposed below the down tube, it hinders the ground clearance of the vehicle and if the battery is disposed over the down tube, it impairs the ride quality as the height of the seat of the vehicle will be required to be increased.
[0004] Therefore, it is not easy to dispose the battery of the electric vehicle in presence of the down tube under the floorboard without impairing the ride quality of the vehicle and its handling. The down tube is integral to provide rigidness to the vehicle frame structure. Thus, the down tube can't be removed from the frame of the electric vehicle.
SUMMARY OF INVENTION
[0005] The present invention disclosed a two-wheeled electric vehicle. The two-wheeled electric vehicle comprising a front wheel and a rear wheel supported by a vehicle body frame. The vehicle body frame comprises a head tube, a down tube, a

pair of first frame members, a pair of second frame members, a pair of third frame members, a battery supports cross bar, a transmission cover, a charger unit, a battery management system (BMS) and a power supply unit.
[0006] The head tube is positioned in front portion of the vehicle. The down tube extends rearwardly & downwardly from the head tube. The pair of first frame members supported by the down tube and extending substantially in the vehicle front-rear direction. The pair of second frame members extending rearwardly and upwardly from the pair of first frame members. The pair of first frame members comprises a left first frame member and a right first frame member. The at least one battery support cross bar disposed between and supported by the left first frame member and the right first frame member in vehicle width direction. The pair of second frame members extending rearwardly and upwardly from the pair of first frame members. The pair of third frame members that are extended from the pair of second frame members rearwardly.
[0007] In an embodiment, the transmission cover which may act as a swing unit
and it may include an electric motor and the electric motor may be disposed below the pair of third frame members and a rear wheel is driven by an output of the electric motor.
[0008] In an embodiment, the power supply unit for providing electric power to
the electric motor. The power supply unit comprises a primary battery and a secondary battery such that the primary battery electrically connected to the secondary battery. In another embodiment, the primary battery coupled to the left first frame member and the down tube, and the secondary battery coupled to the right first frame member and the down tube. By dividing the power supply unit in two batteries, namely the primary battery and the secondary battery, overall battery capacity is not comprised while keeping the rigidness of the frame structure intact. Further, by positioning the batteries besides the down tube keeps the overall height of the vehicle in check and helps in keeping the ride quality to a desired level. Furthermore, the ground clearance of the vehicle also remains to an acceptable level.

[0009] In an embodiment, the charger unit is intermediary electrically connected
with external power supply and the battery. In another embodiment, the charger unit takes an alternative current input from an external power supply and converts it to direct current to charge the battery. In an embodiment, the charger bit may be on-board charging unit. In another embodiment, the charger unit may be off-board charging unit.
[00010] In an embodiment, the battery management system (BMS) may be disposed in either of the batteries, i.e. may be in the primary battery or may be in the secondary battery.
[00011] In an embodiment, a charging port to charge the batteries from the external power supply is provided over the vehicle body cover.
[00012] An object of the present invention is to provide a battery mounting arrangement which shortened the height of the vehicle in up-down direction and to accommodate an electric motor below a floor board which also allows an increased space in accommodation box positioned below the seat.
[00013] Another object of the present invention is to provide a battery supporting and mounting arrangement for the two-wheeled electric vehicle which provides better rigidity to the frame.
[00014] Yet another object of the present invention to enable the two-wheeled electric vehicle with the enlarged battery capacity and disposed it below a floor without impairing the ride quality of the vehicle and also, without increasing the overall length and height of the vehicle.
BRIEF DESCRIPTION OF DRAWINGS
[00015] The invention itself, together with further features and attended advantages, will become apparent from consideration of the following detailed description, taken in conjunction with the accompanying drawings. One or more

embodiments of the present invention are now described, by way of example only wherein like reference numerals represent like elements and in which:
[00016] FIGURE 1 illustrates an exemplary two-wheeled electric vehicle, in accordance with the present invention;
[00017] FIGURE 2 illustrates a two-wheeled electric vehicle, in accordance with the present invention;
[00018] FIGURE 3 illustrates a vehicle body frame in a side view of the two wheeled electric vehicle, in accordance with the present invention;
[00019] FIGURE 4 illustrates the vehicle body frame in an isometric view of the two wheeled electric vehicle, in accordance with the present invention;
[00020] FIGURE 5 illustrates a power supply unit in a plan view of the two wheeled electric vehicle, in accordance with the present invention;
[00021] FIGURE 6 illustrates the power supply unit along with electric cells in an isometric view of the two wheeled electric vehicle, in accordance with the present invention; and
[00022] FIGURE 7 illustrates an assembly sequence for the mounting a power supply unit on the vehicle body frame.
[00023] The drawings referred to in this description are not to be understood as being drawn to scale except if specifically noted, and such drawings are only exemplary in nature. The colored drawings, if provided along with this description are only meant to make the details of invention clear and have no effect whatsoever on the scope of the invention.

DETAILED DESCRIPTION
[00024] While the invention is susceptible to various modifications and
alternative forms, an embodiment thereof has been shown by way of example in the
drawings and will be described here below. It should be understood, however that it is
5 not intended to limit the invention to the particular forms disclosed, but on the
contrary, the invention is to cover all modifications, equivalents, and alternative falling within the spirit and the scope of the invention.
[00025] The term “comprises”, comprising, or any other variations thereof, are
intended to cover a non-exclusive inclusion, such that a setup, structure or method that
10 comprises a list of components or steps does not include only those components or
steps but may include other components or steps not expressly listed or inherent to such setup or structure or method. In other words, one or more elements in a system or apparatus proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or
15 apparatus.
[00026] For the better understanding of this invention, reference would now be
made to the embodiment illustrated in the accompanying figures and description here below, further, in the following figures, the same reference numerals are used to identify the same components in various views.
20 [00027] In the following description, for the purposes of explanation, numerous
specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, that the present invention may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form in order to avoid unnecessarily obscuring the present
25 invention.
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[00028] Several features are described hereafter that can each be used
independently of one another or with any combination of other features. However, any
individual feature may not address any of the problems discussed above or might only
address one of the problems discussed above. Some of the problems discussed above
5 might not be fully addressed by any of the features described herein. Although
headings are provided, information related to a particular heading, but not found in the section having that heading, may also be found elsewhere in the specification.
[00029] While the present invention is illustrated in the context of a saddle riding
10 type vehicle, however, frame and aspects and features thereof can be used with other
type of vehicles as well. The terms “vehicle”, “two wheeled vehicle”, “scooter”,
“electric two wheeled vehicle”, “two wheeled electric vehicle” and “motorcycle” have
been interchangeably used throughout the description. The term “two wheeled
vehicle” includes vehicles such as motorcycles, scooters, bicycles, mopeds, scooter
15 type vehicle, all-terrain vehicles (ATV), two wheeled electric vehicle, hybrid two
wheeled vehicle and the like.
[00030] The terms “front / forward”, “rear / rearward / back / backward”, “up /
upper / upward / top”, “down / lower / lower ward / downward”, “left / leftward”,
20 “right / rightward” used therein represents the directions as seen from a vehicle driver
sitting astride and these directions are referred by arrows Fr, Rr, U, D, L, R in the drawing figures.
[00031] FIGURE 1 illustrates an exemplary two-wheeled electric vehicle (100)
25 in accordance with the present invention. The two-wheeled electric vehicle (100)
comprising: a front wheel (110), a rear wheel (112), a vehicle body cover (102), a
transmission cover (114) and a vehicle body frame (106). The front wheel (110)
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supported by front portion of the vehicle body frame (106) and the rear wheel
supported by rear portion of the vehicle body frame (106). In an embodiment, a
transmission case (114) acting as a swing arm includes an electric motor (not shown,
refer figure 2). A seat (118) is supported by the vehicle body frame (106). The vehicle
5 body cover (102) surrounds the vehicle body frame (106). The vehicle body cover
comprises a front cover (102b), a centre cover (4) and a side frame cover (104). In an embodiment, a floor board (120) is provided in middle portion of the vehicle to accommodate feet of a rider while driving the two-wheeled electric vehicle (100). The handle bar (3) is pivotally mounted on the vehicle body frame (106). The handle bar
10 (3) is configured to be rotated by the rider to steer the vehicle (100). The front wheel
(110) is operatively connected to the handle bar (3). In an embodiment, the rear portion of the vehicle (100) may comprise a suspension assembly (123) and a tail light (104a). A leg shield (102c) that protects legs of the rider is provided on the front side. The centre frame cover (4) is provided behind the leg shield (102c). The centre cover (4)
15 is provided below the front portion of the seat (118). The side frame cover (104) that
covers a vehicle side surface is provided behind the centre frame cover (4). A tail light (104a) and a rear fender (111) are provided at a rear portion of the side frame cover (104).
[00032] The transmission cover (114) which may act as a swing unit and it may
20 include an electric motor (not shown) and the electric motor (not shown) may be
disposed below the pair of third frame members (106c) and a rear wheel (112) is driven by an output of the electric motor (not shown).
[00033] The dotted lines in FIGURE 1 represents the vehicle body frame (106).
The vehicle body frame (106) is explained in detail with respect to figure 3 of this
25 description later in the current disclosure. It may be noted that the two wheeled electric
vehicle (100) is shown to have include above stated parts; however, those skilled in the art would appreciate that the two wheeled electric vehicle (100) includes other parts which may not be relevant for explaining the present invention and hence are not shown and described.
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[00034] FIGURE 2 illustrates an exemplary two-wheeled electric vehicle (100)
in accordance with the present invention. The FIGURE 2 shows the vehicle body
frame (106) and the power supply unit (108) in a dotted line while the vehicle
periphery shown in a solid line. The power supply unit (108) for providing electric
5 power to an electric motor (not shown). The power supply unit (108) comprises a
primary battery (108a) and a secondary battery (108b) such that the primary battery
(108a) electrically connected to the secondary battery (108b). The primary battery
(108a) coupled to the left first frame member (106ab, refer figure 3) and the down
tube (206, refer figure 3), and the secondary battery (108b) coupled to the right first
10 frame member (106ac, refer figure 3) and the down tube (206, refer figure 3). The
power supply unit (108) is explained in detail with respect to FIGURES 5 and 6 of this description in the current disclosure.
[00035] Figure 3 and Figure 4 illustrate the vehicle body frame (106) of the two-
wheeled electric vehicle (100), in accordance with the present invention. Figure 3
15 illustrates the vehicle body frame in a side view of the two wheeled electric vehicle
(100). Figure 4 illustrates the vehicle body frame in an isometric view of the two wheeled electric vehicle (100). The vehicle body frame (106) comprises a head tube (204), a down tube (206), a pair of first frame members (106a), at least one battery support cross bar (318), a pair of second frame members (106b), and a pair of third
20 frame members (106c). The down tube (206) extended rearwardly and downwardly
from the head tube (204). The pair of first frame members (106a) supported by the down tube (206) and extending substantially in vehicle front-rear direction (Fr-Rr). The pair of first frame members (106a) comprises a left first frame member (106ab) and a right first frame member (106ac). The pair of second frame members (106b)
25 extending rearwardly and upwardly from the pair of first frame members (106b). The
pair of second frame members (106b) comprises a left (106bb) and a right (106bc) second frame member. The pair of third frame members (106c) that are extended from the pair of second frame members (106b) rearwardly. The pair of third frame members (106c) comprises a left (106cb) and a right (106cc) third frame member.
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[00036] The battery mounting means (304a, 304b, 304c, 304d) comprises at least
one first battery connecting bracket (304c, 304d), at least one second battery
connecting bracket (304a), and at least one third battery connecting bracket (304b).
5 The battery mounting means (304a, 304b, 304c, 304d) couples the power supply unit
(108) rigidly to the vehicle body frame (106). In an embodiment, the at least one first
battery connecting bracket (304c, 304d) disposed on the down tube (304c, 304d) for
coupling the primary battery (108a) and the secondary battery (108b) from the inner
side surfaces of the power supply unit (108). In same embodiment, the at least one
10 second battery connecting bracket (304a) disposed on the left first frame member
(106ab) to the couple the outer side surface of the primary battery (108a) to the left first frame member (106ab) and the at least one third battery connecting bracket (304b) disposed on the right frame member (106ac) to the couple the outer side surface of the secondary battery (108b) to the right first frame member (106ac).
15
[00037] The at least one battery support cross bar (318) disposed between and
supported by the left first frame member (106ab) and the right first frame member (106ac) in vehicle width direction. In an embodiment, the at least one battery support cross bar (318) disposed below the down tube (206). The primary battery (108a) and
20 the secondary battery (108b) supported from the bottom on the at least one battery
support cross bar (318). In an embodiment, a cross sub frame member (320) disposed in vehicle width direction and connected to a rear end (302) of the down tube (206) and to a front end (316) of the pair of second frame members (106b). At least one third cross member (322) disposed between and supported from the pair of the third frame
25 members (106c). The at least one third cross member (322) disposed with a seat
bracket (322b) to mount a seat catch (not shown).
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[00038] In an embodiment, the power supply unit (108) may act as the floor board
(120, refer figure 1) where the driver can put his feet while driving the vehicle.
[00039] Figure 5 and figure 6 illustrates an exemplary power supply unit (108) of
5 the two wheeled electric vehicle in a plan view. Figure 5 provides a top view and
Figure 6 provides an isometric view of the power supply unit (108). As described in Figure 2, the power supply unit (108) is divided into at least two compartments to accommodate at least one electric cell (506) to deliver electric power to the electric motor. The at least two compartments comprise the primary battery (108a) and the
10 secondary battery (108a). The primary battery (108a) and the secondary battery (108b)
are electrically connected to each other. The electrical connection between the batteries is provided through an electric wire (508). The electric wire (508) is passed from a connecting tube (518). This connecting tube (518) enables the power supply unit (108) to combine electrical capacity of the primary battery (108a) and the
15 secondary battery (108b) to deliver power to the electric motor (not shown) as the
electric wire (508) passed through the connecting tube (518). In an embodiment, the connecting tube (518) passed horizontally from above the down tube (206) to join the primary battery (108a) and the secondary battery (108b). In another embodiment, the connecting tube (518) is hollow in nature and also connects the primary battery (108a)
20 and the secondary battery (108b). In still another embodiment, a first end (518a) of
the connecting tube (518) originates from the inner side surface (510b) of the primary battery (108a) and a distal end (518b) of the connecting tube (518) joined on the inner side surface (510c) of the secondary battery (108b). The battery attaching means (504a, 504b, 504c, 504d) comprises at least one first attaching member (504a) with
25 hole (512a) on the outer side surface of the primary battery (108a) is provided, at least
one second attaching member (504b) with a hole (512b) on the inner side surface of the primary battery (108a) is provided, at least one third attaching member (504d) with a hole (512d) on the inner side surface of the second battery (108b) is provided and
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at least one fourth attaching member (504c) with a hole (512c) on the outer side surface of the secondary battery (108b) is provided.
[00040] In an embodiment, the power unit (108) may be provided with a suitable
cell configuration and packaging to deliver desirable electric power to the electric
5 motor (not shown). The first battery (108a) and the second battery (108b) may be
electrical coupled through the electrical wire (508) such that cumulative capacity of these two batteries (108a, 108b) are configured to provide electric power to the electric motor (not shown) of the electric vehicle (100).
[00041] Figure 7 illustrates an assembly sequence for mounting the power supply
10 unit (108) on the vehicle body frame (106). In an embodiment, the power supply unit
(108) is removably connected to the vehicle (100) with a help of a bolt and nut arrangement. In another embodiment, the power supply unit (108) may be welded on the vehicle body frame (106). The battery connecting brackets (304a, 304b, 304c, 304d) couple with the battery attaching means (504a, 504b, 504c, 504d) to removably
15 attach the power supply unit (108) with the vehicle frame (106) of the two-wheeled
electric vehicle (100). In an embodiment, the power supply unit (108) provided in between the left first frame member (106ab) and the right first frame member (106ac) of the two-wheeled electric vehicle (100). In another embodiment, the primary battery (108a) provided in between the left first frame member (106ab) and the down tube
20 (206). In same embodiment, the secondary battery (108b) provided in between the
down tube (206) and the right first frame member (106ac). The at least one first attaching member (504a) with hole (512a) coupled with the at least one second battery connecting bracket (304a). The at least one second attaching member (504b) with a hole (512b) coupled with the at least one first battery connecting bracket (304c, 304d).
25 Similarly, the at least one third attaching means (504d) with a hole (512d) coupled
with the at least one second battery connecting bracket (304d) different than the bracket used to couple at least one second attaching member (504b). The at least one fourth attaching member (504d) with a hole (512d) coupled with the at least one third battery connecting bracket (304d).
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[00042] One of an advantage associated with the present invention is that it enabled the two-wheeled electric vehicle (100) with the enlarged power capacity (alternatively range of the vehicle (100)) of the power supply unit (108) and that is disposed below the floor board (120) without impairing the ride quality of the vehicle (100) and also, without increasing the overall height of the vehicle (100). By dividing the power supply unit (108) in two compartments, the rigidity of the vehicle body frame (106) is increased as the power supply unit (108) can be assembled besides the down tube (206) and further, ground clearance of the vehicle (100) is also remained in check.
[00043] Although the present invention has been described in considerable detail with reference to certain preferred embodiments and examples thereof, other embodiments and equivalents are possible. Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with functional and procedural details, the disclosure is illustrative only, and changes may be made in detail, especially in terms of the procedural steps within the principles of the invention to the full extent indicated by the broad general meaning of the terms. Thus, various modifications are possible of the presently disclosed system and process without deviating from the intended scope and spirit of the present invention. Accordingly, in one embodiment, such modifications of the presently disclosed system and method are included in the scope of the present invention.

Claim:

A two-wheeled electric vehicle (100) comprising:
a front wheel (110) supported by a vehicle body frame (106); a rear wheel (112) supported by the vehicle body frame (106), the vehicle body frame (106) comprises:
a head tube (204) and a down tube (206), the down tube (206) extended rearwardly and downwardly from the head tube (204),
a pair of first frame members (106a) supported by the down tube (206) and extending substantially in vehicle front-rear direction (Fr-Rr), wherein the pair of first frame members (106a) comprises a left first frame member (106ab) and a right first frame member (106ac),
at least one battery support cross bar (318) disposed between and supported by the left first frame member (106ab) and the right first frame member (106ac) in vehicle width direction; a pair of second frame members (106b) extending rearwardly and upwardly from the pair of first frame members (106b),and
a pair of third frame members (106c) extended from the pair of second frame members (106b) rearwardly; and a power supply unit (108) for providing electric power to an electric motor (104),
wherein the power supply unit (108) comprises a primary battery (108a) and a secondary battery (108b) such that the primary battery (108a) electrically connected to the secondary battery (108b), and wherein the primary battery (108a) coupled to the left first frame member (106ab) and the down tube (206), and the secondary battery (108b) coupled to the right first frame member (106ac) and the down tube (206).

The two-wheeled electric vehicle (100) as claimed in claim 1, wherein at least one first battery connecting bracket (304c, 304d) disposed on the down tube (304c, 304d).
The two-wheeled electric vehicle (100) as claimed in claim 1, wherein at least one second battery connecting bracket (304a) disposed on the left frame member (106ab) and at least one third battery connecting bracket (304b) disposed on the right frame member (106ac).
The two-wheeled electric vehicle (100) as claimed in claim 1, wherein a connecting tube (518) is provided between the primary battery (108a) and the secondary battery (108b).
The two-wheeled electric vehicle (100) as claimed in claim 4, wherein an electrical wire passed through the connecting tube (518) to electrical connect the primary battery (108a) and the secondary battery (108b).
The two wheeled electric vehicle (100) as claimed in claim 1, wherein the at least one battery support cross bar (318) disposed below the down tube (206).
The two wheeled electric vehicle (100) as claimed in claim 1, wherein the vehicle body frame (106) further comprises a cross sub frame member (320) disposed in vehicle width direction and connected to a rear end (302) of the down tube (206) and to a front end (316) of the pair of second frame members (106b).
The two wheeled electric vehicle (100) as claimed in claim 1, wherein the primary battery (108a) and the secondary battery (108b) supported from the bottom on the at least one battery support cross bar (318).
The two wheeled electric vehicle (100) as claimed in claim 1, wherein a first end (518a) of the connecting tube (518) originates from the inner side surface (510b)

of the primary battery (108a) and the distal end (518b) of the connecting tube (518) joined on the inner side surface (510c) of the secondary battery (108b).