Description:TECHNICAL FIELD
[001] The present subject matter relates to a vehicle, more particularly, packaging of an oil chamber in a transmission system of the vehicle.
BACKGROUND
[002] Typically, in a saddle type vehicle, a hub motor is commonly located in a rear wheel of the vehicle. In such an electric vehicle, a motor casing, or a powertrain casing act as a swing arm for the vehicle.
[003] In conventional electric vehicles, a powertrain casing and a cover transmission is constructed to store oil required for lubrication of components in the powertrain, which includes a gear drive and shafts. However, as volume of the casing and the transmission cover is filled with oil, sealing of the assembly becomes critical as each corner may cause leaking of oil. To ensure sealing a gasket can be provided or increase number of bolts, which increases the number of components and wastage of oil.
[004] Further, due to higher volume of oil within the powertrain casing, churning losses are higher, inherently affecting efficiency of the vehicle. Also, a chain drive that connects the motor and the rear wheel, is also required to be wet due to the oil filled within the powertrain casing and transmission cover. As such, dry chain-drive option is not present in the conventional electric vehicle.
[005] Moreover, components like sprocket are not required to be dipped in oil constantly as this may cause unwanted resistance for the sprocket movement because of oil, which adds onto the churning losses of the vehicle.
[006] Additionally, oil present within the casing adds onto unsprung mass of the vehicle, which worsens the structural and vibrational strength of the electric vehicle, which is undesirable. Moreover, during maintenance where powertrain casing is required to be opened, oil wastage will be more as higher volume of oil is needed to be scrapped. As an example, if an operator is required to tighten the belt or replace the sprocket, the operator has to open the cover and then replace, which leads to also wastage of oil.
[007] In view of the above, there is a need for a swing arm structure for the saddle-type electric vehicle which packages an oil chamber, and also addresses one or more limitations stated above.

SUMMARY
[008] The present subject matter provides a transmission system of a vehicle coupled with an electric motor and a motor casing configured to form an oil chamber between a transmission casing and the motor casing of the transmission system.
[009] As per an aspect of the present invention, a transmission system of a vehicle comprising a transmission casing and a motor casing. The transmission casing is configured to secure and cover one or more reduction gears of the transmission system. The motor casing is configured to cover an electric motor of the vehicle. The electric motor comprising a motor shaft, wherein a motive force is transferred from the motor shaft to the one or more reduction gears for providing a motion to a rear wheel of the vehicle. The motor casing and the transmission casing is configured to form an oil chamber in a space provided between the motor casing and the transmission casing. The oil chamber is adapted to encompass the one or more reduction gears for lubrication.
[010] As per an embodiment, the transmission casing comprising an inner transmission casing and an outer transmission casing. The inner transmission casing comprising a first portion and a second portion, and the oil chamber is formed between the first portion and the motor casing.
[011] As per another embodiment, the oil chamber comprising a base portion and one or more supporting walls, and the base portion is configured to conform to a shape and profile of the first portion and the motor casing.
[012] As per another embodiment, the one or more supporting walls is configured to extend upwardly from the base portion and the one or more supporting walls extends up to the motor casing.
[013] As per another embodiment, the motor casing and the first portion of the inner transmission casing is connected through one or more connecting points, and the one or more connecting points is disposed on an outer periphery of the first portion of the inner transmission casing.
[014] As per another aspect of the present invention, a vehicle comprising a frame assembly and a transmission system. The frame assembly comprising an intermediate frame assembly. The intermediate frame assembly comprising one or more receiving portions for receiving and supporting the transmission system of the vehicle. The transmission system of a vehicle comprising a transmission casing and a motor casing. The transmission casing is configured to secure and cover one or more reduction gears of the transmission system. The motor casing is configured to cover an electric motor of the vehicle. The electric motor comprising a motor shaft, wherein a motive force is transferred from the motor shaft to the one or more reduction gears for providing a motion to a rear wheel of the vehicle. The motor casing and the transmission casing is configured to form an oil chamber in a space provided between the motor casing and the transmission casing. The oil chamber is adapted to encompass the one or more reduction gears for lubrication.
[015] As per another embodiment, the intermediate frame assembly is configured to provide a mounting provision for a side stand assembly of the vehicle.
[016] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

BRIEF DESCRIPT ION OF THE DRAWINGS
[017] The present invention is described with reference to figures. This invention is implementable in two-wheeled vehicles, three wheeled, and multi wheeled vehicles. The same numbers are used throughout the drawings to reference like features and components. Further, the inventive features of the invention are outlined in the appended claims.
[018] Figure 1 illustrates a top view of a transmission system of a vehicle, in accordance with an embodiment of the present subject matter.
[019] Figure 2 illustrates a perspective view of the transmission system of the vehicle, in accordance with an embodiment of the present subject matter.
[020] Figure 3 illustrates an exploded view of the transmission system of the vehicle, in accordance with an embodiment of the present subject matter.
[021] Figure 4 illustrates a perspective view of an oil chamber formed in the transmission system of the vehicle, in accordance with an embodiment of the present subject matter.
[022] Figure 5 illustrates a perspective view of an inner transmission casing of the transmission system of the vehicle, in accordance with an embodiment of the present subject matter.

DETAILED DESCRIPTION OF THE DRAWINGS

[023] Exemplary embodiments are described with reference to the accompanying drawings. Wherever convenient, the same reference numbers are used throughout the drawings to refer to the same or like parts. While examples and features of disclosed principles are described herein, modifications, adaptations, and other implementations are possible without departing from the scope of the disclosed embodiments. It is intended that the following detailed description be considered as exemplary only, with the true scope being indicated by the following claims.
[024] The present subject matter is further described with reference to accompanying figures. It should be noted that the description and figures merely illustrate the principles of the present subject matter. Various arrangements may be devised that, although not explicitly described or shown herein, encompass the principles of the present subject matter. Moreover, all statements herein reciting principles, aspects, and examples of the present subject matter, as well as specific examples thereof, are intended to encompass equivalents thereof.
[025] The foregoing disclosure is not intended to limit the present disclosure to the precise forms or particular fields of use disclosed. As such, it is contemplated that various alternate embodiments and/or modifications to the present disclosure, whether explicitly described or implied herein, are possible in light of the disclosure. Having thus described embodiments of the present disclosure, a person of ordinary skill in the art will recognize that changes may be made in form and detail without departing from the scope of the present disclosure. Thus, the present disclosure is limited only by the claims.
[026] Additionally, all numerical terms, such as, but not limited to, “first”, “second”, “third”, “primary”, “secondary”, “main” or any other ordinary and/or numerical terms, should also be taken only as identifiers, to assist the reader's understanding of the various elements, embodiments, variations and/or modifications of the present disclosure, and may not create any limitations, particularly as to the order, or preference, of any element, embodiment, variation and/or modification relative to, or over, another element, embodiment, variation and/or modification.
[027] Hence it is an object of the present invention to provide packaging of an oil chamber between a transmission casing and a motor casing of transmission system of a vehicle and also to overcome other related problems known in the art as explained in the background problem.
[028] It is also an object of the present invention to reduce the amount of oil required to accommodate a larger volume area.
[029] It is also an object of the present invention to prevent leakage of oil from the oil chamber and thereby prevent leakage of oil from the oil chamber.
[030] It is also an object of the present invention to provide ease of assembly, packaging, and serviceability of the oil chamber without using additional parts or complex tools.
[031] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
[032] Figure 1 illustrates a top view of a transmission system (100) of a vehicle, in accordance with an embodiment of the present subject matter. A vehicle comprises a frame assembly (not shown) which acts as askeletal structure of the vehicle. In one embodiment, the vehicle is a two wheeled vehicle, a three wheeled vehicle, or a multi wheeled vehicle. In another embodiment, the vehicle is an electric vehicle or a hybrid electric vehicle. In one embodiment, the vehicle comprising a transmission system (100). The transmission system (100) is also known as a swing arm assembly of the vehicle which transfers motive force from a power unit of the vehicle to one or more wheels of the vehicle for driving the vehicle. In one embodiment, the transmission system (100) comprising a motor casing (102) and a transmission casing (104). The motor casing (102) and the transmission casing (104) are abutted to each other to form the transmission system (100). The transmission casing (104) comprising a transmission assembly (106) which is movably connected to a rear wheel shaft (108) of a rear wheel of the vehicle. The transmission assembly (106) transfers the power from the power unit to the rear wheel of the vehicle.
[033] Figure 2 illustrates a perspective view of the transmission system (100) of the vehicle, in accordance with an embodiment of the present subject matter. In one embodiment, the frame assembly (not shown) of the vehicle comprising an intermediate frame assembly (200). The intermediate frame assembly (200) is configured to receive and accommodate the transmission system (100) of the vehicle. In one embodiment, the intermediate frame assembly (200) comprising a one or more receiving portions (202) for receiving and accommodating the transmission system (100). The intermediate frame assembly (200) comprising a plurality of legs (200a) for supporting the load of the transmission system (100). In one embodiment, the intermediate frame assembly (200) is mounted below a seat assembly of the vehicle and is disposed in a middle portion of the vehicle when viewed along a longitudinal axis of the vehicle. The intermediate frame assembly (200) comprising a connecting member (204, 206) for distributing the load of the transmission system (100) uniformly across the plurality of legs (200a). The intermediate frame assembly (200) comprising side stand assembly (208) extending outwardly from one of the plurality of legs (200a) of the intermediate frame assembly (200). In another embodiment, a first receiving portion of the one or more receiving portions (202) receives the motor casing (102) and a second receiving portion of the one or more receiving portions (202) receives the transmission casing (104). In another embodiment, the transmission casing (104) comprising an inner transmission casing (104a) and an outer transmission casing (104b). In one embodiment, the outer transmission casing (104b) being configured to secure and protect the transmission assembly (106) disposed in the transmission system (100). In another embodiment, the inner transmission casing (104a) being abutted with the motor casing (102).
[034] Figure 3 illustrates an exploded view of the transmission system (100) of the vehicle, in accordance with an embodiment of the present subject matter. In one embodiment, the motor casing (102) comprising an electric motor (300). The electric motor (300) is disposed and secured inside the motor casing (102). The motor casing (102) is fixedly attached to the inner transmission casing (104a) thorough one or more fasteners. The transmission assembly (106) disposed in the inner transmission casing (104a) comprising one or more reduction gears (304). The one or more reduction gears (304) comprising a driver gear and a driven gear disposed on a conveyor unit (306a). In one embodiment, the conveyor unit (306a) is one of a belt or a chain for transmission of motive force. In one embodiment, a driver gear of the one or more reduction gears (304) is operably connected to a motor shaft (302) of the electric motor (300). In another embodiment, a driven gear of the one or more reduction gears (304) is operably connected to the rear wheel shaft (108) of the vehicle. In one embodiment, the outer transmission casing (104b) is connected to the inner transmission casing (104a) through a sealing gasket (306) and the sealing gasket (306) reduces vibration, noise in the transmission system and prevents accidental damage to the transmission assembly (106) of the transmission system (100).
[035] Figure 4 illustrates a perspective view of an oil chamber (400) formed in the transmission system (100) of the vehicle, in accordance with an embodiment of the present subject matter. Figure 5 illustrates a perspective view of an inner transmission casing (104a) of the transmission system (100) of the vehicle, in accordance with an embodiment of the present subject matter. For brevity, figures 4 and 5 shall be discussed together. In one embodiment, the inner transmission casing (104a) comprising a first portion (104aa) and a second portion (104c). In another embodiment, an oil chamber (400) is formed between the first portion (104aa) and the motor casing (102). In one embodiment, the first portion (104aa) is provided in conjunction and proximity of the motor casing (102) and the second portion (104c) is disposed away from the motor casing (102). In one embodiment, the oil chamber (400) comprising a base portion (502) and one or more supporting walls (500). The oil chamber (400) is configured to conform to a shape and profile of the first portion (104aa) and the motor casing (102). In an exemplary embodiment, when the shape and profile of the motor casing (102) and the inner transmission casing (104) is circular, then the oil chamber (400) also has a circular profile. In another embodiment, when the shape and profile of the motor casing (102) and the inner transmission casing (104) is rectangular, then the oil chamber (400) also has a rectangular profile. In another embodiment, the base portion (502) is configured to accommodate and receive oil in the oil chamber (400) and thereby provide a designated volume for accommodating the oil. In another embodiment, the one or more supporting walls (500) is configured to extend upwardly from the base portion (502). In another embodiment, the one or more supporting walls (500) extends up to the motor casing (102) and the one or more supporting walls (500) abuts with the motor casing (102). In another embodiment, the base portion (502) comprising a first stepped portion (502a) and a second stepped portion (502b) configured for receiving the motor shaft (302), the driver gear of the one or more reduction gears (304) and the conveyor unit (306a). In another embodiment, the motor casing (102) and the first portion (104aa) of the inner transmission casing (104a) is connected through one or more connecting points (504). In one embodiment, the one or more connecting points (504) is disposed on an outer periphery of the first portion (104aa) of the inner transmission casing (104a). In one embodiment, the oil chamber (400) being adapted to encompass the one or more reduction gears (304) for lubrication.
[036] Various embodiments of the invention provides a transmission system of a vehicle coupled with an electric motor and a motor casing configured to form an oil chamber between a transmission casing and the motor casing of the transmission system.
[037] The present invention is a transmission system of a vehicle comprising a transmission casing and a motor casing. The transmission casing is configured to secure and cover one or more reduction gears of the transmission system. The motor casing is configured to cover an electric motor of the vehicle. The electric motor comprising a motor shaft, wherein a motive force is transferred from the motor shaft to the one or more reduction gears for providing a motion to a rear wheel of the vehicle. The motor casing and the transmission casing is configured to form an oil chamber in a space provided between the motor casing and the transmission casing. The oil chamber is adapted to encompass the one or more reduction gears for lubrication.
[038] The present claimed invention solves the technical problem of leakage of oil from conventional oil chambers and thereby requiring frequent oil changes and refilling.
[039] Specifically, the oil chamber formed between the inner transmission casing and the motor casing reduces the volume required for the oil to be filled without disrupting the existing function of the transmission system and thereby reduces the amount of oil to be used for filling the oil chamber and in turn reduces overall weight of the vehicle.
[040] Additionally, the present invention eliminates the requirement of usage of long and thick sealants and thereby reduces the part count and overall weight of the transmission system.
[041] Furthermore, since the area of sealing surface is restricted between the first portion of the inner transmission casing and the motor casing, the amount of fasteners to bolt the same is also reduced and thereby reduces the overall part count and cost of the vehicle.
[042] The present invention also provides advantages of ease of serviceability and assembly of the oil chamber by just removing or unfastening the fasteners between the motor casing and the first portion of the inner transmission casing of the transmission system.
[043] In light of the above-mentioned advantages and the technical advancements provided by the disclosed transmission system of a vehicle coupled with an electric motor and a motor casing configured to form an oil chamber between a transmission casing and the motor casing of the transmission system, the claimed invention as discussed above is not routine, conventional, or well understood in the art, as the claimed invention enable the following solutions to the existing problems in conventional technologies.
[044] Furthermore, a person skilled in the art would not be motivated to design a transmission system of a vehicle coupled with an electric motor and a motor casing configured to form an oil chamber between a transmission casing and the motor casing of the transmission system.
[045] While the present invention has been shown and described with reference to the foregoing preferred embodiments, it will be apparent to those skilled in the art that changes in form, connection, and detail may be made therein without departing from the spirit and scope of the invention.

Reference Numerals:



100 transmission system
102 motor casing
104 transmission casing
104a inner transmission casing
104b outer transmission casing
104aa first portion
104c second portion
106 transmission assembly
108 wheel shaft
200 intermediate frame assembly
200a plurality of legs
202 one or more receiving portions
204, 206 connecting member
208 side stand assembly
300 electric motor
302 motor shaft
304 one or more reduction gears
306 sealing gasket
306a one or more conveyor unit
400 oil chamber
500 one or more supporting walls
502 base portion
502a first stepped portion
502b second stepped portion

504 one or more connecting points
, Claims:I/We claim:
1. A transmission system (100) of a vehicle, said transmission system comprising:
a transmission casing (104), said transmission casing (104) being configured to secure and cover one or more reduction gears (304) of said transmission system (100);
a motor casing (102), said motor casing (102) being configured to cover an electric motor (300) of said vehicle;
wherein said electric motor (300) comprising a motor shaft (302), wherein a motive force being transferred from said motor shaft (302) to said one or more reduction gears (304) for providing a motion to a rear wheel of said vehicle;
wherein said motor casing (102) and said transmission casing (104) being configured to form an oil chamber (400) in a space provided between said motor casing (102) and said transmission casing (104);
wherein said oil chamber (400) being adapted to encompass said one or more reduction gears (304) for lubrication.
2. The transmission system (100) as claimed in claim 1, wherein said transmission casing (104) comprising an inner transmission casing (104a) and an outer transmission casing (104b).
3. The transmission system (100) as claimed in claim 2, wherein said inner transmission casing (104a) comprising a first portion (104aa) and a second portion (104c), wherein said oil chamber (400) being formed between said first portion (104aa) and said motor casing (102).
4. The transmission system (100) as claimed in claim 1, wherein said oil chamber (400) comprising a base portion (502) and one or more supporting walls (500), wherein said oil chamber (400) being configured to conform to a shape and profile of said first portion (104aa) and said motor casing (102).
5. The transmission system (100) as claimed in claim 4, wherein said one or more supporting walls (500) being configured to extend upwardly from said base portion (502) and said one or more supporting walls (500) extends up to said motor casing (102).
6. The transmission system (100) as claimed in claim 4, wherein said motor casing (102) and said first portion (104aa) of said inner transmission casing (104a) being connected through one or more connecting points (504), wherein said one or more connecting points (504) being disposed on an outer periphery of said first portion (104aa) of said inner transmission casing (104a).
7. A vehicle comprising:
a frame assembly, said frame assembly comprising an intermediate frame assembly (200);
a transmission system (100);
wherein said intermediate frame assembly (200) comprising one or more receiving portions (202) for receiving and supporting said transmission system (100) of said vehicle;
wherein said transmission system (100) comprising:
a transmission casing (104), said transmission casing (104) being configured to secure and cover one or more reduction gears (304) of said transmission system (100);
a motor casing (102), said motor casing (102) being configured to cover an electric motor (300) of said vehicle;
wherein said electric motor (300) comprising a motor shaft (302), wherein a motive force is transferred from said motor shaft (302) to said one or more reduction gears (304) for providing a motion to a rear wheel of said vehicle;
wherein said motor casing (102) and said transmission casing (104) being configured to form an oil chamber (400) in a space provided between said motor casing (102) and said transmission casing (104);
wherein said oil chamber (400) being adapted to encompass said one or more reduction gears (304) for lubrication.
8. The vehicle as claimed in claim 7, wherein said intermediate frame assembly (200) being configured to provide a mounting provision for a side stand assembly (208) of said vehicle.