FORM 2
THE PATENTS ACT 1970
[39 OF 1970]
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
[See section 10; rule 13] TITLE: “A TRANSAXLE FOR AN ELECTRIC VEHICLE”
Name and Address of the Applicant:
TATA MOTORS LIMITED; an Indian company having a registered address at Bombay House, 24 Homi Mody Street, Hutatma Chowk, Mumbai 400 001 Maharashtra, India.
Nationality: Indian
The following specification particularly describes the invention and the manner in which it is to be performed.

TECHNICAL FIELD
[001] Present disclosure, in general, relates to the field of automobiles. Particularly, but not exclusively, the present disclosure relates to a transaxle of an electric vehicle. Further, embodiments of the present disclosure relate to the transaxle coupled to an electric motor and the transaxle configured to drive wheels of the vehicle.
BACKGROUND OF THE DISCLOSURE
[002] Vehicles powered by internal combustion engines generally include a transmission for controlled application of power to wheels of the vehicle. The transmission includes components such as, but not limited to, clutch, gearbox, prop shaft in case of rear-wheel drive vehicles, differential, and final drive shafts that are coupled to wheels of the vehicle. However, vehicles powered by electric motors include a transaxle comprising an integrated arrangement of gear train and differential for controlled application of power to wheels of the vehicle. Unlike the conventional transmission arrangement having separate gearbox and differential, the transaxle is an integrated unit of gear train and differential, whereby performing functions of both the gearbox and the differential. The transaxle may include a planetary gear train and a differential device coupled to the planetary gear train for transmitting drive force of the electric motor to the wheels of the vehicle.
[003] Further, since both the gear train and the differential components needs to be integrated in the transaxle, assembly process of the transaxle involves multiple steps, requires skilled technicians and is often a cumbersome process. Furthermore, components of the transaxle needs to firmly coupled to each other during assembly, due to high-speed operational requirements. Due to large number of components that are integrated together in the transaxle, servicing of the transaxle is tedious, time consuming and increases operational downtime of the vehicle. Moreover, currently used transaxles are bulky and hence, are not preferred for use in passenger vehicles such as but not limited to, compact SUV’s, hatchback, and sedan’s due to space constraints and noise concerns.

[004] The present disclosure is directed to overcome one or more limitations stated above or any other limitations associated with the conventional configuration of the transaxles.
SUMMARY OF THE DISCLOSURE
[005] One or more shortcomings of the prior art are overcome by a transaxle for a vehicle as claimed and additional advantages are provided through the transaxle as claimed in the present disclosure. Additional features and advantages are realized through the techniques of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered a part of the claimed disclosure.
[006] In one non-limiting embodiment of the present disclosure, a transaxle for an electric vehicle is disclosed. The transaxle includes a housing body. The housing body includes a first casing and a second casing coupled to each other. An outer surface of the first casing and the second casing are defined with one or more mounting bosses and a plurality of ribs at predetermined locations. Further, a gear train is accommodated in the housing body, and the gear train is connectable to an electric motor. Furthermore, a differential gear is coupled to the gear train. The differential gear is housed in a tapered enclosure to transmit torque to drive wheels of the electric vehicle.
[007] In an embodiment of the present disclosure, the one or more mounting bosses are configured to be coupled to at least one of a frame and an engine of the vehicle.
[008] In an embodiment of the present disclosure, at least one of the first casing and the second casing are defined with at least 10 to 15 ribs. The plurality of ribs have a thickness in range of 5 mm to 15 mm.
[009] In an embodiment of the present disclosure, the tapered enclosure is designed in a bell-shaped enclosure.

[0010] In an embodiment of the present disclosure, the differential gear is rotatably supported by a pair of taper roller bearings.
[0011] In an embodiment of the present disclosure, each of the pair of taper roller bearings is housed in the first casing and the second casing.
[0012] In an embodiment of the present disclosure, the first casing and the second casing are defined with a plurality of apertures. The plurality of apertures are configured to accommodate fasteners for coupling of the first casing to the second casing.
[0013] In an embodiment of the present disclosure, the plurality of apertures are defined on an outer periphery of the first casing and the second casing.
[0014] In an embodiment of the present disclosure, the gear train includes a first gear shaft connectable to a driving shaft of the electric motor, a second gear shaft connectable to the differential gear, and an intermediate gear shaft rotatably coupled to the first gear shaft and the second gear shaft.
[0015] In an embodiment of the present disclosure, the gear train is configured as a two-stage gear train.
[0016] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
[0017] The novel features and characteristic of the disclosure are set forth in the appended claims. The disclosure itself, however, as well as a preferred mode of use, further objectives, and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in

conjunction with the accompanying figures. One or more embodiments are now described, by way of example only, with reference to the accompanying figures wherein like reference numerals represent like elements and in which:
[0018] Figure 1 illustrates a perspective view of a transaxle for an electric vehicle, in accordance with an exemplary embodiment of the present disclosure.
[0019] Figure 2 illustrates a front view of the transaxle of the Figure 1.
[0020] Figures 3 illustrates a rear view of the transaxle of the Figure 1.
[0021] Figure 4 illustrates a top view of the transaxle of the Figure 1.
[0022] Figure 5 illustrates a sectional view of the transaxle of the Figure 1.
[0023] The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following description that alternative embodiments of the system and the method illustrated herein may be employed without departing from the principles of the disclosure described herein.
DETAILED DESCRIPTION
[0024] While the embodiments in the disclosure are subject to various modifications and alternative forms, specific embodiments thereof have been shown by the way of example in the figures and will be described below. It should be understood, however that it is not intended to limit the disclosure to the particular forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternative falling within the scope of the disclosure.
[0025] The terms “comprises”, “comprising”, or any other variations thereof used in the disclosure, are intended to cover a non-exclusive inclusions, such that a device, assembly, mechanism, system, method that comprises a list of components does not include only those components but may include other components not

expressly listed or inherent to such system, or assembly, or device. In other words, one or more elements in a system proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or method.
[0026] Embodiments of the present disclosure disclose a transaxle for a vehicle. The transaxle includes a housing body. The housing body includes a first casing and a second casing coupled to each other. An outer surface of the first casing and the second casing are defined with one or more mounting bosses and a plurality of ribs at predetermined locations. Further, a gear train is accommodated in the housing body, and the gear train is connectable to an electric motor. Furthermore, a differential gear is coupled to the gear train. The differential gear is housed in a tapered enclosure to transmit torque to drive wheels of the electric vehicle.
[0027] The disclosure is described in the following paragraphs with reference to Figures 1 to 5. In the Figures, the same element or elements which have same functions are indicated by the same reference signs. It is to be noted that, the vehicle and the entire transaxle system including electric motor and wheels are not illustrated in the figures for the purpose of simplicity. One skilled in the art would appreciate that the transaxle as disclosed in the present disclosure may be used in any vehicles that employs/includes transmission and/or differential gear, where such vehicle may include, but not be limited to, light duty vehicles, passenger vehicles, commercial vehicles, electric vehicles (EV), and the like.
[0028] Figure 1 illustrates a front perspective view of a transaxle (100) in accordance with an exemplary embodiment of the present disclosure. The term ‘transaxle’ as used herein refers to an integrated mechanical device configured to perform functions of a vehicle’s transmission, axle, and differential. The transaxle (100) of the present disclosure may be employed in both manual and automatic transmission vehicles. Further, although the transaxle (100) of the present disclosure is described in the context of being driven by an electric motor and being employed in an electric vehicle, such description may not be viewed as a limitation

of the transaxle (100). In this regard, it is to be noted that the transaxle (100) may also be driven any other prime mover such as, but not limited to, an internal combustion engine, a hydraulic motor, and the like.
[0029] Figure 2 illustrates a front view of the transaxle (100), when viewed along the direction depicted by pointer ‘A’ in Figure 1. Further, Figure 3 illustrates a rear view of the transaxle (100), when viewed along the direction depicted by pointer ‘B’ in Figure 1. Figure 4 illustrates a top view of the transaxle (100), when viewed along direction depicted by pointer ‘C’ in Figure 1. Figure 5 illustrates a sectional view of the transaxle (100), with the section taken along plane X-X depicted in Figure 1. The transaxle (100) of the present disclosure is described in the following paragraphs with reference to the above-mentioned Figures.
[0030] Referring to Figure 1, the transaxle (100) includes a housing body (1). The housing body (1) includes a first casing (2) and a second casing (3) coupled to each other (also shown in Figure 4). The first casing (2) may also be referred to as front casing or front housing. Further, the second casing (3) may also be referred to as rear casing or rear housing. The housing body (1) may be formed by coupling the first casing (2) and the second casing (3) to each other and space defined therein (i.e., within the housing body (1)) may be configured to accommodate components/elements of the transaxle (100) or powertrain. The first casing (2) and the second casing (3) may be removably fixed to each another by fastening means. In an embodiment, the first casing (2) and the second casing (3) may be configured symmetrically along a central axis Y-Y, as shown in the Figure 4. The first casing (2) and the second casing (3) may be configured symmetrically only at periphery along which they are coupled together (i.e., the edges along which the casings are coupled/joined). However, the first casing (2) and the second casing (3) may also be formed asymmetrically along the central axis Y-Y, with the outer shape and form of the first casing (2) and the second casing (3) being different from each other.
[0031] Further, the transaxle (100) includes a gear train (4) (outlined in Figure 5) accommodated in the housing body (1). The gear train (4) may be connectable to

an electric motor (not shown in the Figures). The term ‘gear train’ as used herein refers to a system or an arrangement of a plurality of gears that are coupled together to transmit motion from one shaft to another. The transaxle (100) further includes a differential gear (5) (outlined in Figure 5), that is coupled to the gear train (4). The term ‘differential gear’ (also referred to as ‘differential’) as used herein refers to a system of gears configured to allow different drive wheels (i.e., wheels of the vehicle to which power is delivered from the electric motor) on the same axle to rotate at different speeds, such as when the vehicle is turning or moving on a curved path. The differential gear (5) is configured to transmit torque to drive wheels of the electric vehicle.
[0032] The housing body (1) may be defined with openings or cavities that allow for coupling of an input shaft of the electric motor (not shown in Figures) to the gear train (4) and for coupling of shafts (not shown in Figures) of the differential gear (5) to drive wheels of the vehicle. In an embodiment, an outer surface (6) of the first casing (2) is defined with a first opening (11), as shown in Figure 2. The first opening (11) is configured to allow for insertion of an input shaft of the electric motor, for coupling of the input shaft of the electric motor the gear train (4). Further, the outer surface (6) of the first casing (2) is also defined with a second opening (12), as shown in Figure 2. Likewise, on an opposite face of the housing body (1), that is, on an outer surface (7) the second casing (3), a third opening (13) is defined as shown in Figure 3. The second opening (12) and the third opening (13) are configured to allow for insertion of the shafts of the differential gear (i.e., to let the shafts pass through the openings 12 and 13), which are further coupled to the drive wheels of the vehicle.
[0033] In an embodiment, the outer surface (6) of the first casing (2) and the outer surface (7) the second casing (3) are defined with one or more mounting bosses (8, 9, 10). The term ‘mounting boss’ as used herein refers to a protrusion or a protruding feature defined on the first casing (2) and the second casing (3) and provide an opening/attachment point for coupling of the housing body (1) to another component such as, but not limited to, a frame, a chassis, and an engine of the

vehicle. The one or more mounting bosses (8, 9, 10) are configured to be coupled to at least one of a frame, a chassis, a body, and an engine of the vehicle.
[0034] Referring to Figure 3, the outer surface (7) of the second casing (3) may be defined with a first set (8) of mounting bosses and a second set (9) of mounting bosses. The first set (8) of mounting bosses may include at least three mounting bosses. The first set (8) of mounting bosses may be arranged in form of a triangle as shown in Figure 3. The first set (8) of mounting bosses may be defined on a first region of the outer surface (7) of the second casing (3), where such first region lies behind the first opening (11) of the first casing (2). Further, the second set (9) of mounting bosses may include at least four mounting bosses. The second set (9) of mounting bosses may be arranged along a curved path as shown in the Figure 3. The second set (9) of mounting bosses may be defined second region of the outer surface (7) of the second casing (3), where such second region lies below the third opening (13) of the second casing (3). The first set (8) of mounting bosses and the second set (9) of mounting bosses are configured to allow coupling of the housing body (1) to at least one of a frame, a chassis, a body, and an engine of the vehicle.
[0035] As illustrated in Figures 1 and 3, the outer surface (6) of the first casing (2) and the outer surface (7) of the second casing (3) may be defined with a third set (10) of mounting bosses. As can be seen in Figure 1, the third set (10) includes at least three mounting bosses. Among the at least three mounting bosses of the third set (10), two of the mounting bosses are defined on the outer surface (7) of the second casing (3), while the remaining mounting boss is defined on the outer surface (6) of the first casing (2). The third set (10) of mounting bosses are defined at the periphery of the first casing (2) and the second casing (3) and may be configured to allow coupling of the housing body (2) to at least one of a frame, a chassis, a body, and an engine of the vehicle.
[0036] In an embodiment, the first set (8), the second set (9) and the third set (10) of mounting bosses are configured to allow for firm attachment of the housing body (2) to at least one of a frame, a chassis, a body, and an engine of the vehicle. The

first set (8), the second set (9) and the third set (10) of mounting bosses may be at least one of a cradle mounting boss, cylindrical boss (also called as C bosses) and the like. The configuration of the first set (8), the second set (9) and the third set (10) of mounting bosses including parameters such as, but not limited to, position, relative position and pattern of positioning, thickness, depth, and diameter of hole comprised in the mounting boss, whereby facilitating firm attachment of the housing body (2). The first set (8), the second set (9) and the third set (10) of mounting bosses are configured to minimize vibration of the transaxle (100) and the components housed therein, during operation of the transaxle (100). The first set (8), the second set (9) and the third set (10) of mounting bosses are configured for optimum noise, vibration, and harshness (NVH) performance, during operation of the transaxle (100).
[0037] Referring to Figures 2 and 3, the outer surface (6) of the first casing (2) and the outer surface (7) of the second casing (3) are defined with a plurality of ribs at predetermined locations. The outer surface (6) of the first casing (2) and the outer surface (7) of the second casing (3) may be defined with at least 10 to 15 ribs. In an embodiment, a first group (14) of ribs may be defined around the first opening (11). The first group (14) of ribs may be defined in a circumferential pattern (similar to petals emerging out from a central portion of a flower) around the first opening (11). The first group (14) of ribs may include at least 5 to 10 ribs. Further, a second group (15) of ribs may be defined around the second opening (12). The second group (15) of ribs may be defined in a circumferential pattern around the second opening (12). The second group (15) of ribs may include at least 10 to 15 ribs. Furthermore, a third group (16) of ribs may be defined in a circumferential pattern around the third opening (13). The third group (16) of ribs may be defined all around the third opening (13) or may be defined in a manner that covers at least a portion of region covering the third opening (13) (as shown in Figure 3). The third group (16) of ribs may include at least 5 to 10 ribs. In addition to the above, a fourth group of ribs (17) (shown in Figure 3) may be defined on a region lying between the third opening (13) and an individual mounting boss of the first set (8) of the mounting

bosses. The fourth group of ribs (17) may include at least three to five ribs. A fifth group of ribs (18) may be defined on the outer surface (7) of the second casing (3). The fifth group of ribs (18) may be defined to connect between individual bosses of the first set (8) of the mounting bosses, as shown in Figure 3. It is to be noted that any number of additional ribs may be defined on the outer surface (6) of the first casing (2) and the outer surface (7) of the second casing (3), for operational and strength requirements of the housing body (2).
[0038] In an embodiment, the plurality of ribs (14, 15, 16, 17 and 18) may have a thickness in range of 5 mm to 15 mm. The plurality of ribs (14, 15, 16, 17 and 18) may be configured to enhance load-carrying ability or stiffness of the first casing (2) and the second casing (3), whereby increasing stiffness of the housing body (2). The plurality of ribs (14, 15, 16, 17 and 18) may be defined substantially perpendicular to the surface of the casing. That is, the plurality of ribs (14, 15, 16, 17 and 18) may be defined substantially perpendicular to the outer surface (6) of the first casing (2) and the outer surface (7) of the second casing (3). The plurality of ribs (14, 15, 16, 17 and 18) may also be configured such that the outer surface (6) of the first casing (2) and the outer surface (7) of the second casing (3) have smooth and aesthetic appearance. The plurality of ribs (14, 15, 16, 17 and 18) may be configured for optimum noise, vibration, and harshness (NVH) performance, during operation of the transaxle (100).
[0039] Referring to Figure 5, the gear train (4) may include a first gear shaft (19), a second gear shaft (20), and an intermediate gear shaft (21). The first gear shaft (19) may be rotatably connectable to a driving shaft of the electric motor. That is, a first gear (not shown in Figures) of the first gear shaft (19) is configured to mesh with a driving gear of the driving shaft of the electric motor. The gear train (4) further includes a second gear shaft (20) connectable to the differential gear (5). That is, a second gear (not shown in Figures) of the second gear shaft (20) may be configured to mesh with a ring gear of the differential gear (5). Further, an intermediate gear shaft (21) is rotatably coupled to the first gear shaft (19) and the

second gear shaft (20). The intermediate gear shaft (21) may include a pair of gears configured to mesh with the first gear of the first gear shaft (19) and the second gear of the second gear shaft (20). The gear train (4) may be configured as a single speed two-stage reduction gear train. The shafts included in the gear train (4) of the present disclosure are configured are hollow shafts, whereby decreasing weight of the gear train (4) and in-turn the transaxle (100).
[0040] Referring to Figure 5 again, the differential gear (5) may be housed in a tapered enclosure (22). In an embodiment, the tapered enclosure (22) may be designed in a bell-shaped enclosure. The configuration of the differential gear (5) housed in a tapered enclosure (22) makes the transaxle (100) compact, whereby saving space and minimizing mounting requirements of the transaxle (100). Further, the differential gear (5) may be rotatably supported by a pair of taper roller bearings (23, 24), within the housing body (1). A first taper roller bearing (23) may be housed in the first casing (2), while a second taper roller bearing (24) may be housed in the second casing (3). The pair of tapered roller bearings (23, 24) reduce friction and in turn reduce the heat generated during operation of the differential gear (5). In comparison with roller bearings, the pair of tapered roller bearings (23, 24) provide better operational performance when subjected to simultaneous large vertical (radial) and horizontal (axial) forces.
[0041] As illustrated in Figures 2 and 3, the first casing (2) and the second casing (3) may be defined with a plurality of apertures (25). The plurality of apertures (25) may be defined on an outer periphery of the first casing (2) and the second casing (3). The plurality of apertures (25) may be threaded apertures configured to accommodate fasteners for coupling of the first casing (2) to the second casing (3). The plurality of apertures (25) may be configured complementary to each other, such that the first casing (2) may be coupled to the second casing (3), by the fasteners accommodated in the plurality of apertures (25). The plurality of apertures (25) may be configured for firm attachment of the first casing (2) and the second

casing (3), and for optimum noise, vibration, and harshness (NVH) performance, during operation of the transaxle (100).
[0042] In an embodiment, the housing body (1) may be defined with at least one cavity for filling of lubricant and for draining of lubricant. As illustrated in Figure 1, the first casing (2) may be defined with a first cavity (26) for filling of lubricant required for optimal operation of the transaxle (100). The first casing (2) may also be defined with a second cavity (27) for draining of the lubricant. In another embodiment, the first cavity (26) and the second cavity (27) may be defined on the second casing (3) of the housing body (1). In yet another embodiment, the first cavity (26) and the second cavity (27) may be defined on the first casing (2) and the second casing (3), respectively. In a further embodiment, the first cavity (26) and the second cavity (27) may be defined on the second casing (3) and the first casing (2), respectively.
[0043] In an embodiment, the transaxle (100) of the present disclosure includes fewer mounting bosses in comparison with conventional transaxles, while satisfying operational requirements relating to NVH performance of the transaxle (100). The transaxle (100) includes plurality of ribs (14, 15, 16, 17 and 18) configured to provide additional reinforcement to the housing body (1) of the transaxle (100), whereby increasing stiffness and optimizing NVH performance of the transaxle (100). The aspect of having fewer mounting bosses and providing plurality of ribs (14, 15, 16, 17 and 18) reduces costs associated with manufacture of transaxles (100), in comparison with conventional transaxles. The shafts included in the gear train (4) of the present disclosure are configured are hollow shafts, whereby decreasing weight of the gear train (4) and in-turn the transaxle (100). The transaxle (100) of the present disclosure is lighter in weight (approximately by 2 kg) in comparison with conventional transaxles that are currently employed in EV’s. The configuration of the transaxle (100) of the present disclosure including tapered enclosure (22) for accommodating differential gear (5) and employing pair of taper roller bearings (23, 24) for rotatably supporting the

differential gear (5), makes the transaxle (100) compact and lightweight. Th configuration of the transaxle (100) also facilitates optimal utilization of lubrican and significantly decreases lubricant requirements of the transaxle (100). Further conventional transaxles having requirement of lubricant replenishment for ever 10,000 kilometers of travel of the vehicle. On the contrary, the transaxle (100) o the present disclosure has lubricant replenishment requirement for every 80,00 kilometers of travel of the vehicle, whereby resulting in significant reduction of cos associated with lubricant replenishment.
EQUIVALENTS
With respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity.
It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim

includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system (100) having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system (100) having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B.”
In addition, where features or aspects of the disclosure are described in terms of Markush groups, those skilled in the art will recognize that the disclosure is also thereby described in terms of any individual member or subgroup of members of the Markush group.

While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.
REFERRAL NUMERICALS

Particulars Numerical
Housing body 1
First casing 2
Second casing 3
Gear train 4
Differential gear 5
Outer surface of first casing 6
Outer surface of second casing 7
First set of mounting bosses 8
Second set of mounting bosses 9
Third set of mounting bosses 10
First opening 11
Second opening 12
Third opening 13

First group of ribs 14
Second group of ribs 15
Third group of ribs 16
Fourth group of ribs 17
Fifth group of ribs 18
First gear shaft 19
Second gear shaft 20
Intermediate gear shaft 21
Tapered enclosure 22
First taper roller bearing 23
Second taper roller bearing 24
Apertures 25
First cavity 26
Second cavity 27
Transaxle 100

We claim:
1. A transaxle (100) for an electric vehicle, the transaxle (100) comprising:
a housing body (1) comprising:
a first casing (2) and a second casing (3) coupled to each other, wherein an outer surface (6, 7) of the first casing (2) and the second casing (3) are defined with one or more mounting bosses (8, 9, 10) and a plurality of ribs (14, 15, 16, 17 and 18) at predetermined locations;
a gear train (4) accommodated in the housing body (1), wherein the gear train (4) is connectable to an electric motor; and
a differential gear (5) coupled to the gear train (4), wherein the differential gear (5) is housed in a tapered enclosure (22) to transmit torque to drive wheels of the electric vehicle.
2. The transaxle (100) as claimed in claim 1, wherein the one or more mounting bosses (8, 9, 10) are configured to be coupled to at least one of a frame and an engine of the vehicle.
3. The transaxle (100) as claimed in in claim 1, wherein at least one of the first casing (2) and the second casing (3) are defined with at least 10 to 15 ribs, and wherein the plurality of ribs (14, 15, 16, 17 and 18) have a thickness in range of 5 mm to 15 mm.
4. The transaxle (100) as claimed in claim 1, wherein the tapered enclosure (22) is designed in a bell-shaped enclosure.
5. The transaxle (100) as claimed in claim 1, wherein the differential gear (5) is rotatably supported by a pair of taper roller bearings (23, 24).

6. The transaxle (100) as claimed in claim 1, wherein each of the pair of taper roller bearings (23, 24) is housed in the first casing (2) and the second casing (3).
7. The transaxle (100) as claimed in claim 1, wherein the first casing (2) and the second casing (3) are defined with a plurality of apertures (25), wherein the plurality of apertures (25) are configured to accommodate fasteners for coupling of the first casing (2) to the second casing (3).
8. The transaxle (100) as claimed in claim 1, wherein the plurality of apertures (25) are defined on an outer periphery of the first casing (2) and the second casing (3).
9. The transaxle (100) as claimed in claim 1, wherein the gear train (4) comprises a first gear shaft (19) connectable to a driving shaft of the electric motor, a second gear shaft (20) connectable to the differential gear (5), and an intermediate gear shaft (21) rotatably coupled to the first gear shaft (19) and the second gear shaft (20).
10. The transaxle (100) as claimed in claim 6, wherein the gear train (4) is configured as a two-stage gear train.
11. A vehicle comprising a transaxle (100) as claimed in claim 1.